gecko-dev/services/common/kinto-http-client.js

/*
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
"use strict";

/*
 * This file is generated from kinto-http.js - do not modify directly.
 */

const global = this;

var EXPORTED_SYMBOLS = ["KintoHttpClient"];

const { setTimeout, clearTimeout } = ChromeUtils.import("resource://gre/modules/Timer.jsm");
const { XPCOMUtils } = ChromeUtils.import("resource://gre/modules/XPCOMUtils.jsm");
XPCOMUtils.defineLazyGlobalGetters(global, ["fetch"]);

/*
 * Version 5.1.1 - 30c540a
 */

(function (global, factory) {
    typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
    typeof define === 'function' && define.amd ? define(factory) :
    (global = global || self, global.KintoHttpClient = factory());
}(this, (function () { 'use strict';

    /*! *****************************************************************************
    Copyright (c) Microsoft Corporation. All rights reserved.
    Licensed under the Apache License, Version 2.0 (the "License"); you may not use
    this file except in compliance with the License. You may obtain a copy of the
    License at http://www.apache.org/licenses/LICENSE-2.0

    THIS CODE IS PROVIDED ON AN *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
    WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
    MERCHANTABLITY OR NON-INFRINGEMENT.

    See the Apache Version 2.0 License for specific language governing permissions
    and limitations under the License.
    ***************************************************************************** */
    function __decorate(decorators, target, key, desc) {
        var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
        if (typeof Reflect === "object" && typeof Reflect.decorate === "function")
            r = Reflect.decorate(decorators, target, key, desc);
        else
            for (var i = decorators.length - 1; i >= 0; i--)
                if (d = decorators[i])
                    r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
        return c > 3 && r && Object.defineProperty(target, key, r), r;
    }

    /**
     * Chunks an array into n pieces.
     *
     * @private
     * @param  {Array}  array
     * @param  {Number} n
     * @return {Array}
     */
    function partition(array, n) {
        if (n <= 0) {
            return [array];
        }
        return array.reduce((acc, x, i) => {
            if (i === 0 || i % n === 0) {
                acc.push([x]);
            }
            else {
                acc[acc.length - 1].push(x);
            }
            return acc;
        }, []);
    }
    /**
     * Returns a Promise always resolving after the specified amount in milliseconds.
     *
     * @return Promise<void>
     */
    function delay(ms) {
        return new Promise((resolve) => setTimeout(resolve, ms));
    }
    /**
     * Always returns a resource data object from the provided argument.
     *
     * @private
     * @param  {Object|String} resource
     * @return {Object}
     */
    function toDataBody(resource) {
        if (isObject(resource)) {
            return resource;
        }
        if (typeof resource === "string") {
            return { id: resource };
        }
        throw new Error("Invalid argument.");
    }
    /**
     * Transforms an object into an URL query string, stripping out any undefined
     * values.
     *
     * @param  {Object} obj
     * @return {String}
     */
    function qsify(obj) {
        const encode = (v) => encodeURIComponent(typeof v === "boolean" ? String(v) : v);
        const stripped = cleanUndefinedProperties(obj);
        return Object.keys(stripped)
            .map((k) => {
            const ks = encode(k) + "=";
            if (Array.isArray(stripped[k])) {
                return ks + stripped[k].map((v) => encode(v)).join(",");
            }
            else {
                return ks + encode(stripped[k]);
            }
        })
            .join("&");
    }
    /**
     * Checks if a version is within the provided range.
     *
     * @param  {String} version    The version to check.
     * @param  {String} minVersion The minimum supported version (inclusive).
     * @param  {String} maxVersion The minimum supported version (exclusive).
     * @throws {Error} If the version is outside of the provided range.
     */
    function checkVersion(version, minVersion, maxVersion) {
        const extract = (str) => str.split(".").map((x) => parseInt(x, 10));
        const [verMajor, verMinor] = extract(version);
        const [minMajor, minMinor] = extract(minVersion);
        const [maxMajor, maxMinor] = extract(maxVersion);
        const checks = [
            verMajor < minMajor,
            verMajor === minMajor && verMinor < minMinor,
            verMajor > maxMajor,
            verMajor === maxMajor && verMinor >= maxMinor,
        ];
        if (checks.some((x) => x)) {
            throw new Error(`Version ${version} doesn't satisfy ${minVersion} <= x < ${maxVersion}`);
        }
    }
    /**
     * Generates a decorator function ensuring a version check is performed against
     * the provided requirements before executing it.
     *
     * @param  {String} min The required min version (inclusive).
     * @param  {String} max The required max version (inclusive).
     * @return {Function}
     */
    function support(min, max) {
        return function (
        // @ts-ignore
        target, key, descriptor) {
            const fn = descriptor.value;
            return {
                configurable: true,
                get() {
                    const wrappedMethod = (...args) => {
                        // "this" is the current instance which its method is decorated.
                        const client = this.client ? this.client : this;
                        return client
                            .fetchHTTPApiVersion()
                            .then((version) => checkVersion(version, min, max))
                            .then(() => fn.apply(this, args));
                    };
                    Object.defineProperty(this, key, {
                        value: wrappedMethod,
                        configurable: true,
                        writable: true,
                    });
                    return wrappedMethod;
                },
            };
        };
    }
    /**
     * Generates a decorator function ensuring that the specified capabilities are
     * available on the server before executing it.
     *
     * @param  {Array<String>} capabilities The required capabilities.
     * @return {Function}
     */
    function capable(capabilities) {
        return function (
        // @ts-ignore
        target, key, descriptor) {
            const fn = descriptor.value;
            return {
                configurable: true,
                get() {
                    const wrappedMethod = (...args) => {
                        // "this" is the current instance which its method is decorated.
                        const client = this.client ? this.client : this;
                        return client
                            .fetchServerCapabilities()
                            .then((available) => {
                            const missing = capabilities.filter((c) => !(c in available));
                            if (missing.length > 0) {
                                const missingStr = missing.join(", ");
                                throw new Error(`Required capabilities ${missingStr} not present on server`);
                            }
                        })
                            .then(() => fn.apply(this, args));
                    };
                    Object.defineProperty(this, key, {
                        value: wrappedMethod,
                        configurable: true,
                        writable: true,
                    });
                    return wrappedMethod;
                },
            };
        };
    }
    /**
     * Generates a decorator function ensuring an operation is not performed from
     * within a batch request.
     *
     * @param  {String} message The error message to throw.
     * @return {Function}
     */
    function nobatch(message) {
        return function (
        // @ts-ignore
        target, key, descriptor) {
            const fn = descriptor.value;
            return {
                configurable: true,
                get() {
                    const wrappedMethod = (...args) => {
                        // "this" is the current instance which its method is decorated.
                        if (this._isBatch) {
                            throw new Error(message);
                        }
                        return fn.apply(this, args);
                    };
                    Object.defineProperty(this, key, {
                        value: wrappedMethod,
                        configurable: true,
                        writable: true,
                    });
                    return wrappedMethod;
                },
            };
        };
    }
    /**
     * Returns true if the specified value is an object (i.e. not an array nor null).
     * @param  {Object} thing The value to inspect.
     * @return {bool}
     */
    function isObject(thing) {
        return typeof thing === "object" && thing !== null && !Array.isArray(thing);
    }
    /**
     * Parses a data url.
     * @param  {String} dataURL The data url.
     * @return {Object}
     */
    function parseDataURL(dataURL) {
        const regex = /^data:(.*);base64,(.*)/;
        const match = dataURL.match(regex);
        if (!match) {
            throw new Error(`Invalid data-url: ${String(dataURL).substr(0, 32)}...`);
        }
        const props = match[1];
        const base64 = match[2];
        const [type, ...rawParams] = props.split(";");
        const params = rawParams.reduce((acc, param) => {
            const [key, value] = param.split("=");
            return Object.assign(Object.assign({}, acc), { [key]: value });
        }, {});
        return Object.assign(Object.assign({}, params), { type, base64 });
    }
    /**
     * Extracts file information from a data url.
     * @param  {String} dataURL The data url.
     * @return {Object}
     */
    function extractFileInfo(dataURL) {
        const { name, type, base64 } = parseDataURL(dataURL);
        const binary = atob(base64);
        const array = [];
        for (let i = 0; i < binary.length; i++) {
            array.push(binary.charCodeAt(i));
        }
        const blob = new Blob([new Uint8Array(array)], { type });
        return { blob, name };
    }
    /**
     * Creates a FormData instance from a data url and an existing JSON response
     * body.
     * @param  {String} dataURL            The data url.
     * @param  {Object} body               The response body.
     * @param  {Object} [options={}]       The options object.
     * @param  {Object} [options.filename] Force attachment file name.
     * @return {FormData}
     */
    function createFormData(dataURL, body, options = {}) {
        const { filename = "untitled" } = options;
        const { blob, name } = extractFileInfo(dataURL);
        const formData = new FormData();
        formData.append("attachment", blob, name || filename);
        for (const property in body) {
            if (typeof body[property] !== "undefined") {
                formData.append(property, JSON.stringify(body[property]));
            }
        }
        return formData;
    }
    /**
     * Clones an object with all its undefined keys removed.
     * @private
     */
    function cleanUndefinedProperties(obj) {
        const result = {};
        for (const key in obj) {
            if (typeof obj[key] !== "undefined") {
                result[key] = obj[key];
            }
        }
        return result;
    }
    /**
     * Handle common query parameters for Kinto requests.
     *
     * @param  {String}  [path]  The endpoint base path.
     * @param  {Array}   [options.fields]    Fields to limit the
     *   request to.
     * @param  {Object}  [options.query={}]  Additional query arguments.
     */
    function addEndpointOptions(path, options = {}) {
        const query = Object.assign({}, options.query);
        if (options.fields) {
            query._fields = options.fields;
        }
        const queryString = qsify(query);
        if (queryString) {
            return path + "?" + queryString;
        }
        return path;
    }
    /**
     * Replace authorization header with an obscured version
     */
    function obscureAuthorizationHeader(headers) {
        const h = new Headers(headers);
        if (h.has("authorization")) {
            h.set("authorization", "**** (suppressed)");
        }
        const obscuredHeaders = {};
        for (const [header, value] of h.entries()) {
            obscuredHeaders[header] = value;
        }
        return obscuredHeaders;
    }

    /**
     * Kinto server error code descriptors.
     */
    const ERROR_CODES = {
        104: "Missing Authorization Token",
        105: "Invalid Authorization Token",
        106: "Request body was not valid JSON",
        107: "Invalid request parameter",
        108: "Missing request parameter",
        109: "Invalid posted data",
        110: "Invalid Token / id",
        111: "Missing Token / id",
        112: "Content-Length header was not provided",
        113: "Request body too large",
        114: "Resource was created, updated or deleted meanwhile",
        115: "Method not allowed on this end point (hint: server may be readonly)",
        116: "Requested version not available on this server",
        117: "Client has sent too many requests",
        121: "Resource access is forbidden for this user",
        122: "Another resource violates constraint",
        201: "Service Temporary unavailable due to high load",
        202: "Service deprecated",
        999: "Internal Server Error",
    };
    class NetworkTimeoutError extends Error {
        constructor(url, options) {
            super(`Timeout while trying to access ${url} with ${JSON.stringify(options)}`);
            if (Error.captureStackTrace) {
                Error.captureStackTrace(this, NetworkTimeoutError);
            }
            this.url = url;
            this.options = options;
        }
    }
    class UnparseableResponseError extends Error {
        constructor(response, body, error) {
            const { status } = response;
            super(`Response from server unparseable (HTTP ${status || 0}; ${error}): ${body}`);
            if (Error.captureStackTrace) {
                Error.captureStackTrace(this, UnparseableResponseError);
            }
            this.status = status;
            this.response = response;
            this.stack = error.stack;
            this.error = error;
        }
    }
    /**
     * "Error" subclass representing a >=400 response from the server.
     *
     * Whether or not this is an error depends on your application.
     *
     * The `json` field can be undefined if the server responded with an
     * empty response body. This shouldn't generally happen. Most "bad"
     * responses come with a JSON error description, or (if they're
     * fronted by a CDN or nginx or something) occasionally non-JSON
     * responses (which become UnparseableResponseErrors, above).
     */
    class ServerResponse extends Error {
        constructor(response, json) {
            const { status } = response;
            let { statusText } = response;
            let errnoMsg;
            if (json) {
                // Try to fill in information from the JSON error.
                statusText = json.error || statusText;
                // Take errnoMsg from either ERROR_CODES or json.message.
                if (json.errno && json.errno in ERROR_CODES) {
                    errnoMsg = ERROR_CODES[json.errno];
                }
                else if (json.message) {
                    errnoMsg = json.message;
                }
                // If we had both ERROR_CODES and json.message, and they differ,
                // combine them.
                if (errnoMsg && json.message && json.message !== errnoMsg) {
                    errnoMsg += ` (${json.message})`;
                }
            }
            let message = `HTTP ${status} ${statusText}`;
            if (errnoMsg) {
                message += `: ${errnoMsg}`;
            }
            super(message.trim());
            if (Error.captureStackTrace) {
                Error.captureStackTrace(this, ServerResponse);
            }
            this.response = response;
            this.data = json;
        }
    }

    var errors = /*#__PURE__*/Object.freeze({
        __proto__: null,
        'default': ERROR_CODES,
        NetworkTimeoutError: NetworkTimeoutError,
        ServerResponse: ServerResponse,
        UnparseableResponseError: UnparseableResponseError
    });

    /**
     * Enhanced HTTP client for the Kinto protocol.
     * @private
     */
    class HTTP {
        /**
         * Constructor.
         *
         * @param {EventEmitter} events                       The event handler.
         * @param {Object}       [options={}}                 The options object.
         * @param {Number}       [options.timeout=null]       The request timeout in ms, if any (default: `null`).
         * @param {String}       [options.requestMode="cors"] The HTTP request mode (default: `"cors"`).
         */
        constructor(events, options = {}) {
            // public properties
            /**
             * The event emitter instance.
             * @type {EventEmitter}
             */
            this.events = events;
            /**
             * The request mode.
             * @see  https://fetch.spec.whatwg.org/#requestmode
             * @type {String}
             */
            this.requestMode = options.requestMode || HTTP.defaultOptions.requestMode;
            /**
             * The request timeout.
             * @type {Number}
             */
            this.timeout = options.timeout || HTTP.defaultOptions.timeout;
        }
        /**
         * Default HTTP request headers applied to each outgoing request.
         *
         * @type {Object}
         */
        static get DEFAULT_REQUEST_HEADERS() {
            return {
                Accept: "application/json",
                "Content-Type": "application/json",
            };
        }
        /**
         * Default options.
         *
         * @type {Object}
         */
        static get defaultOptions() {
            return { timeout: null, requestMode: "cors" };
        }
        /**
         * @private
         */
        timedFetch(url, options) {
            let hasTimedout = false;
            return new Promise((resolve, reject) => {
                // Detect if a request has timed out.
                let _timeoutId;
                if (this.timeout) {
                    _timeoutId = setTimeout(() => {
                        hasTimedout = true;
                        if (options && options.headers) {
                            options = Object.assign(Object.assign({}, options), { headers: obscureAuthorizationHeader(options.headers) });
                        }
                        reject(new NetworkTimeoutError(url, options));
                    }, this.timeout);
                }
                function proceedWithHandler(fn) {
                    return (arg) => {
                        if (!hasTimedout) {
                            if (_timeoutId) {
                                clearTimeout(_timeoutId);
                            }
                            fn(arg);
                        }
                    };
                }
                fetch(url, options)
                    .then(proceedWithHandler(resolve))
                    .catch(proceedWithHandler(reject));
            });
        }
        /**
         * @private
         */
        async processResponse(response) {
            const { status, headers } = response;
            const text = await response.text();
            // Check if we have a body; if so parse it as JSON.
            let json;
            if (text.length !== 0) {
                try {
                    json = JSON.parse(text);
                }
                catch (err) {
                    throw new UnparseableResponseError(response, text, err);
                }
            }
            if (status >= 400) {
                throw new ServerResponse(response, json);
            }
            return { status, json: json, headers };
        }
        /**
         * @private
         */
        async retry(url, retryAfter, request, options) {
            await delay(retryAfter);
            return this.request(url, request, Object.assign(Object.assign({}, options), { retry: options.retry - 1 }));
        }
        /**
         * Performs an HTTP request to the Kinto server.
         *
         * Resolves with an objet containing the following HTTP response properties:
         * - `{Number}  status`  The HTTP status code.
         * - `{Object}  json`    The JSON response body.
         * - `{Headers} headers` The response headers object; see the ES6 fetch() spec.
         *
         * @param  {String} url               The URL.
         * @param  {Object} [request={}]      The request object, passed to
         *     fetch() as its options object.
         * @param  {Object} [request.headers] The request headers object (default: {})
         * @param  {Object} [options={}]      Options for making the
         *     request
         * @param  {Number} [options.retry]   Number of retries (default: 0)
         * @return {Promise}
         */
        async request(url, request = { headers: {} }, options = { retry: 0 }) {
            // Ensure default request headers are always set
            request.headers = Object.assign(Object.assign({}, HTTP.DEFAULT_REQUEST_HEADERS), request.headers);
            // If a multipart body is provided, remove any custom Content-Type header as
            // the fetch() implementation will add the correct one for us.
            if (request.body && request.body instanceof FormData) {
                if (request.headers instanceof Headers) {
                    request.headers.delete("Content-Type");
                }
                else if (!Array.isArray(request.headers)) {
                    delete request.headers["Content-Type"];
                }
            }
            request.mode = this.requestMode;
            const response = await this.timedFetch(url, request);
            const { headers } = response;
            this._checkForDeprecationHeader(headers);
            this._checkForBackoffHeader(headers);
            // Check if the server summons the client to retry after a while.
            const retryAfter = this._checkForRetryAfterHeader(headers);
            // If number of allowed of retries is not exhausted, retry the same request.
            if (retryAfter && options.retry > 0) {
                return this.retry(url, retryAfter, request, options);
            }
            else {
                return this.processResponse(response);
            }
        }
        _checkForDeprecationHeader(headers) {
            const alertHeader = headers.get("Alert");
            if (!alertHeader) {
                return;
            }
            let alert;
            try {
                alert = JSON.parse(alertHeader);
            }
            catch (err) {
                console.warn("Unable to parse Alert header message", alertHeader);
                return;
            }
            console.warn(alert.message, alert.url);
            if (this.events) {
                this.events.emit("deprecated", alert);
            }
        }
        _checkForBackoffHeader(headers) {
            let backoffMs;
            const backoffHeader = headers.get("Backoff");
            const backoffSeconds = backoffHeader ? parseInt(backoffHeader, 10) : 0;
            if (backoffSeconds > 0) {
                backoffMs = new Date().getTime() + backoffSeconds * 1000;
            }
            else {
                backoffMs = 0;
            }
            if (this.events) {
                this.events.emit("backoff", backoffMs);
            }
        }
        _checkForRetryAfterHeader(headers) {
            const retryAfter = headers.get("Retry-After");
            if (!retryAfter) {
                return;
            }
            const delay = parseInt(retryAfter, 10) * 1000;
            const tryAgainAfter = new Date().getTime() + delay;
            if (this.events) {
                this.events.emit("retry-after", tryAgainAfter);
            }
            return delay;
        }
    }

    /**
     * Endpoints templates.
     * @type {Object}
     */
    const ENDPOINTS = {
        root: () => "/",
        batch: () => "/batch",
        permissions: () => "/permissions",
        bucket: (bucket) => "/buckets" + (bucket ? `/${bucket}` : ""),
        history: (bucket) => `${ENDPOINTS.bucket(bucket)}/history`,
        collection: (bucket, coll) => `${ENDPOINTS.bucket(bucket)}/collections` + (coll ? `/${coll}` : ""),
        group: (bucket, group) => `${ENDPOINTS.bucket(bucket)}/groups` + (group ? `/${group}` : ""),
        record: (bucket, coll, id) => `${ENDPOINTS.collection(bucket, coll)}/records` + (id ? `/${id}` : ""),
        attachment: (bucket, coll, id) => `${ENDPOINTS.record(bucket, coll, id)}/attachment`,
    };

    const requestDefaults = {
        safe: false,
        // check if we should set default content type here
        headers: {},
        patch: false,
    };
    /**
     * @private
     */
    function safeHeader(safe, last_modified) {
        if (!safe) {
            return {};
        }
        if (last_modified) {
            return { "If-Match": `"${last_modified}"` };
        }
        return { "If-None-Match": "*" };
    }
    /**
     * @private
     */
    function createRequest(path, { data, permissions }, options = {}) {
        const { headers, safe } = Object.assign(Object.assign({}, requestDefaults), options);
        const method = options.method || (data && data.id) ? "PUT" : "POST";
        return {
            method,
            path,
            headers: Object.assign(Object.assign({}, headers), safeHeader(safe)),
            body: { data, permissions },
        };
    }
    /**
     * @private
     */
    function updateRequest(path, { data, permissions }, options = {}) {
        const { headers, safe, patch } = Object.assign(Object.assign({}, requestDefaults), options);
        const { last_modified } = Object.assign(Object.assign({}, data), options);
        const hasNoData = data &&
            Object.keys(data).filter((k) => k !== "id" && k !== "last_modified")
                .length === 0;
        if (hasNoData) {
            data = undefined;
        }
        return {
            method: patch ? "PATCH" : "PUT",
            path,
            headers: Object.assign(Object.assign({}, headers), safeHeader(safe, last_modified)),
            body: { data, permissions },
        };
    }
    /**
     * @private
     */
    function jsonPatchPermissionsRequest(path, permissions, opType, options = {}) {
        const { headers, safe, last_modified } = Object.assign(Object.assign({}, requestDefaults), options);
        const ops = [];
        for (const [type, principals] of Object.entries(permissions)) {
            if (principals) {
                for (const principal of principals) {
                    ops.push({
                        op: opType,
                        path: `/permissions/${type}/${principal}`,
                    });
                }
            }
        }
        return {
            method: "PATCH",
            path,
            headers: Object.assign(Object.assign(Object.assign({}, headers), safeHeader(safe, last_modified)), { "Content-Type": "application/json-patch+json" }),
            body: ops,
        };
    }
    /**
     * @private
     */
    function deleteRequest(path, options = {}) {
        const { headers, safe, last_modified } = Object.assign(Object.assign({}, requestDefaults), options);
        if (safe && !last_modified) {
            throw new Error("Safe concurrency check requires a last_modified value.");
        }
        return {
            method: "DELETE",
            path,
            headers: Object.assign(Object.assign({}, headers), safeHeader(safe, last_modified)),
        };
    }
    /**
     * @private
     */
    function addAttachmentRequest(path, dataURI, { data, permissions } = {}, options = {}) {
        const { headers, safe, gzipped } = Object.assign(Object.assign({}, requestDefaults), options);
        const { last_modified } = Object.assign(Object.assign({}, data), options);
        const body = { data, permissions };
        const formData = createFormData(dataURI, body, options);
        const customPath = `${path}${gzipped !== null ? "?gzipped=" + (gzipped ? "true" : "false") : ""}`;
        return {
            method: "POST",
            path: customPath,
            headers: Object.assign(Object.assign({}, headers), safeHeader(safe, last_modified)),
            body: formData,
        };
    }

    /**
     * Exports batch responses as a result object.
     *
     * @private
     * @param  {Array} responses The batch subrequest responses.
     * @param  {Array} requests  The initial issued requests.
     * @return {Object}
     */
    function aggregate(responses = [], requests = []) {
        if (responses.length !== requests.length) {
            throw new Error("Responses length should match requests one.");
        }
        const results = {
            errors: [],
            published: [],
            conflicts: [],
            skipped: [],
        };
        return responses.reduce((acc, response, index) => {
            const { status } = response;
            const request = requests[index];
            if (status >= 200 && status < 400) {
                acc.published.push(response.body);
            }
            else if (status === 404) {
                // Extract the id manually from request path while waiting for Kinto/kinto#818
                const regex = /(buckets|groups|collections|records)\/([^/]+)$/;
                const extracts = request.path.match(regex);
                const id = extracts && extracts.length === 3 ? extracts[2] : undefined;
                acc.skipped.push({
                    id,
                    path: request.path,
                    error: response.body,
                });
            }
            else if (status === 412) {
                acc.conflicts.push({
                    // XXX: specifying the type is probably superfluous
                    type: "outgoing",
                    local: request.body,
                    remote: (response.body.details && response.body.details.existing) || null,
                });
            }
            else {
                acc.errors.push({
                    path: request.path,
                    sent: request,
                    error: response.body,
                });
            }
            return acc;
        }, results);
    }

    // Unique ID creation requires a high quality random # generator. In the browser we therefore
    // require the crypto API and do not support built-in fallback to lower quality random number
    // generators (like Math.random()).
    // getRandomValues needs to be invoked in a context where "this" is a Crypto implementation. Also,
    // find the complete implementation of crypto (msCrypto) on IE11.
    var getRandomValues = typeof crypto != 'undefined' && crypto.getRandomValues && crypto.getRandomValues.bind(crypto) || typeof msCrypto != 'undefined' && typeof msCrypto.getRandomValues == 'function' && msCrypto.getRandomValues.bind(msCrypto);
    var rnds8 = new Uint8Array(16); // eslint-disable-line no-undef
    function rng() {
        if (!getRandomValues) {
            throw new Error('crypto.getRandomValues() not supported. See https://github.com/uuidjs/uuid#getrandomvalues-not-supported');
        }
        return getRandomValues(rnds8);
    }

    /**
     * Convert array of 16 byte values to UUID string format of the form:
     * XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
     */
    var byteToHex = [];
    for (var i = 0; i < 256; ++i) {
        byteToHex[i] = (i + 0x100).toString(16).substr(1);
    }
    function bytesToUuid(buf, offset) {
        var i = offset || 0;
        var bth = byteToHex; // join used to fix memory issue caused by concatenation: https://bugs.chromium.org/p/v8/issues/detail?id=3175#c4
        return [bth[buf[i++]], bth[buf[i++]], bth[buf[i++]], bth[buf[i++]], '-', bth[buf[i++]], bth[buf[i++]], '-', bth[buf[i++]], bth[buf[i++]], '-', bth[buf[i++]], bth[buf[i++]], '-', bth[buf[i++]], bth[buf[i++]], bth[buf[i++]], bth[buf[i++]], bth[buf[i++]], bth[buf[i++]]].join('');
    }

    function v4(options, buf, offset) {
        var i = buf && offset || 0;
        if (typeof options == 'string') {
            buf = options === 'binary' ? new Array(16) : null;
            options = null;
        }
        options = options || {};
        var rnds = options.random || (options.rng || rng)(); // Per 4.4, set bits for version and `clock_seq_hi_and_reserved`
        rnds[6] = rnds[6] & 0x0f | 0x40;
        rnds[8] = rnds[8] & 0x3f | 0x80; // Copy bytes to buffer, if provided
        if (buf) {
            for (var ii = 0; ii < 16; ++ii) {
                buf[i + ii] = rnds[ii];
            }
        }
        return buf || bytesToUuid(rnds);
    }

    /**
     * Abstract representation of a selected collection.
     *
     */
    class Collection {
        /**
         * Constructor.
         *
         * @param  {KintoClient}  client            The client instance.
         * @param  {Bucket}       bucket            The bucket instance.
         * @param  {String}       name              The collection name.
         * @param  {Object}       [options={}]      The options object.
         * @param  {Object}       [options.headers] The headers object option.
         * @param  {Boolean}      [options.safe]    The safe option.
         * @param  {Number}       [options.retry]   The retry option.
         * @param  {Boolean}      [options.batch]   (Private) Whether this
         *     Collection is operating as part of a batch.
         */
        constructor(client, bucket, name, options = {}) {
            /**
             * @ignore
             */
            this.client = client;
            /**
             * @ignore
             */
            this.bucket = bucket;
            /**
             * The collection name.
             * @type {String}
             */
            this.name = name;
            this._endpoints = client.endpoints;
            /**
             * @ignore
             */
            this._retry = options.retry || 0;
            this._safe = !!options.safe;
            // FIXME: This is kind of ugly; shouldn't the bucket be responsible
            // for doing the merge?
            this._headers = Object.assign(Object.assign({}, this.bucket.headers), options.headers);
        }
        get execute() {
            return this.client.execute.bind(this.client);
        }
        /**
         * Get the value of "headers" for a given request, merging the
         * per-request headers with our own "default" headers.
         *
         * @private
         */
        _getHeaders(options) {
            return Object.assign(Object.assign({}, this._headers), options.headers);
        }
        /**
         * Get the value of "safe" for a given request, using the
         * per-request option if present or falling back to our default
         * otherwise.
         *
         * @private
         * @param {Object} options The options for a request.
         * @returns {Boolean}
         */
        _getSafe(options) {
            return Object.assign({ safe: this._safe }, options).safe;
        }
        /**
         * As _getSafe, but for "retry".
         *
         * @private
         */
        _getRetry(options) {
            return Object.assign({ retry: this._retry }, options).retry;
        }
        /**
         * Retrieves the total number of records in this collection.
         *
         * @param  {Object} [options={}]      The options object.
         * @param  {Object} [options.headers] The headers object option.
         * @param  {Number} [options.retry=0] Number of retries to make
         *     when faced with transient errors.
         * @return {Promise<Number, Error>}
         */
        async getTotalRecords(options = {}) {
            const path = this._endpoints.record(this.bucket.name, this.name);
            const request = {
                headers: this._getHeaders(options),
                path,
                method: "HEAD",
            };
            const { headers } = await this.client.execute(request, {
                raw: true,
                retry: this._getRetry(options),
            });
            return parseInt(headers.get("Total-Records"), 10);
        }
        /**
         * Retrieves the ETag of the records list, for use with the `since` filtering option.
         *
         * @param  {Object} [options={}]      The options object.
         * @param  {Object} [options.headers] The headers object option.
         * @param  {Number} [options.retry=0] Number of retries to make
         *     when faced with transient errors.
         * @return {Promise<String, Error>}
         */
        async getRecordsTimestamp(options = {}) {
            const path = this._endpoints.record(this.bucket.name, this.name);
            const request = {
                headers: this._getHeaders(options),
                path,
                method: "HEAD",
            };
            const { headers } = (await this.client.execute(request, {
                raw: true,
                retry: this._getRetry(options),
            }));
            return headers.get("ETag");
        }
        /**
         * Retrieves collection data.
         *
         * @param  {Object} [options={}]      The options object.
         * @param  {Object} [options.headers] The headers object option.
         * @param  {Object} [options.query]   Query parameters to pass in
         *     the request. This might be useful for features that aren't
         *     yet supported by this library.
         * @param  {Array}  [options.fields]  Limit response to
         *     just some fields.
         * @param  {Number} [options.retry=0] Number of retries to make
         *     when faced with transient errors.
         * @return {Promise<Object, Error>}
         */
        async getData(options = {}) {
            const path = this._endpoints.collection(this.bucket.name, this.name);
            const request = { headers: this._getHeaders(options), path };
            const { data } = (await this.client.execute(request, {
                retry: this._getRetry(options),
                query: options.query,
                fields: options.fields,
            }));
            return data;
        }
        /**
         * Set collection data.
         * @param  {Object}   data                    The collection data object.
         * @param  {Object}   [options={}]            The options object.
         * @param  {Object}   [options.headers]       The headers object option.
         * @param  {Number}   [options.retry=0]       Number of retries to make
         *     when faced with transient errors.
         * @param  {Boolean}  [options.safe]          The safe option.
         * @param  {Boolean}  [options.patch]         The patch option.
         * @param  {Number}   [options.last_modified] The last_modified option.
         * @return {Promise<Object, Error>}
         */
        async setData(data, options = {}) {
            if (!isObject(data)) {
                throw new Error("A collection object is required.");
            }
            const { patch, permissions } = options;
            const { last_modified } = Object.assign(Object.assign({}, data), options);
            const path = this._endpoints.collection(this.bucket.name, this.name);
            const request = updateRequest(path, { data, permissions }, {
                last_modified,
                patch,
                headers: this._getHeaders(options),
                safe: this._getSafe(options),
            });
            return this.client.execute(request, {
                retry: this._getRetry(options),
            });
        }
        /**
         * Retrieves the list of permissions for this collection.
         *
         * @param  {Object} [options={}]      The options object.
         * @param  {Object} [options.headers] The headers object option.
         * @param  {Number} [options.retry=0] Number of retries to make
         *     when faced with transient errors.
         * @return {Promise<Object, Error>}
         */
        async getPermissions(options = {}) {
            const path = this._endpoints.collection(this.bucket.name, this.name);
            const request = { headers: this._getHeaders(options), path };
            const { permissions } = (await this.client.execute(request, {
                retry: this._getRetry(options),
            }));
            return permissions;
        }
        /**
         * Replaces all existing collection permissions with the ones provided.
         *
         * @param  {Object}   permissions             The permissions object.
         * @param  {Object}   [options={}]            The options object
         * @param  {Object}   [options.headers]       The headers object option.
         * @param  {Number}   [options.retry=0]       Number of retries to make
         *     when faced with transient errors.
         * @param  {Boolean}  [options.safe]          The safe option.
         * @param  {Number}   [options.last_modified] The last_modified option.
         * @return {Promise<Object, Error>}
         */
        async setPermissions(permissions, options = {}) {
            if (!isObject(permissions)) {
                throw new Error("A permissions object is required.");
            }
            const path = this._endpoints.collection(this.bucket.name, this.name);
            const data = { last_modified: options.last_modified };
            const request = updateRequest(path, { data, permissions }, {
                headers: this._getHeaders(options),
                safe: this._getSafe(options),
            });
            return this.client.execute(request, {
                retry: this._getRetry(options),
            });
        }
        /**
         * Append principals to the collection permissions.
         *
         * @param  {Object}  permissions             The permissions object.
         * @param  {Object}  [options={}]            The options object
         * @param  {Boolean} [options.safe]          The safe option.
         * @param  {Object}  [options.headers]       The headers object option.
         * @param  {Number}  [options.retry=0]       Number of retries to make
         *     when faced with transient errors.
         * @param  {Object}  [options.last_modified] The last_modified option.
         * @return {Promise<Object, Error>}
         */
        async addPermissions(permissions, options = {}) {
            if (!isObject(permissions)) {
                throw new Error("A permissions object is required.");
            }
            const path = this._endpoints.collection(this.bucket.name, this.name);
            const { last_modified } = options;
            const request = jsonPatchPermissionsRequest(path, permissions, "add", {
                last_modified,
                headers: this._getHeaders(options),
                safe: this._getSafe(options),
            });
            return this.client.execute(request, {
                retry: this._getRetry(options),
            });
        }
        /**
         * Remove principals from the collection permissions.
         *
         * @param  {Object}  permissions             The permissions object.
         * @param  {Object}  [options={}]            The options object
         * @param  {Boolean} [options.safe]          The safe option.
         * @param  {Object}  [options.headers]       The headers object option.
         * @param  {Number}  [options.retry=0]       Number of retries to make
         *     when faced with transient errors.
         * @param  {Object}  [options.last_modified] The last_modified option.
         * @return {Promise<Object, Error>}
         */
        async removePermissions(permissions, options = {}) {
            if (!isObject(permissions)) {
                throw new Error("A permissions object is required.");
            }
            const path = this._endpoints.collection(this.bucket.name, this.name);
            const { last_modified } = options;
            const request = jsonPatchPermissionsRequest(path, permissions, "remove", {
                last_modified,
                headers: this._getHeaders(options),
                safe: this._getSafe(options),
            });
            return this.client.execute(request, {
                retry: this._getRetry(options),
            });
        }
        /**
         * Creates a record in current collection.
         *
         * @param  {Object}  record                The record to create.
         * @param  {Object}  [options={}]          The options object.
         * @param  {Object}  [options.headers]     The headers object option.
         * @param  {Number}  [options.retry=0]     Number of retries to make
         *     when faced with transient errors.
         * @param  {Boolean} [options.safe]        The safe option.
         * @param  {Object}  [options.permissions] The permissions option.
         * @return {Promise<Object, Error>}
         */
        async createRecord(record, options = {}) {
            const { permissions } = options;
            const path = this._endpoints.record(this.bucket.name, this.name, record.id);
            const request = createRequest(path, { data: record, permissions }, {
                headers: this._getHeaders(options),
                safe: this._getSafe(options),
            });
            return this.client.execute(request, {
                retry: this._getRetry(options),
            });
        }
        /**
         * Adds an attachment to a record, creating the record when it doesn't exist.
         *
         * @param  {String}  dataURL                 The data url.
         * @param  {Object}  [record={}]             The record data.
         * @param  {Object}  [options={}]            The options object.
         * @param  {Object}  [options.headers]       The headers object option.
         * @param  {Number}  [options.retry=0]       Number of retries to make
         *     when faced with transient errors.
         * @param  {Boolean} [options.safe]          The safe option.
         * @param  {Number}  [options.last_modified] The last_modified option.
         * @param  {Object}  [options.permissions]   The permissions option.
         * @param  {String}  [options.filename]      Force the attachment filename.
         * @param  {String}  [options.gzipped]       Force the attachment to be gzipped or not.
         * @return {Promise<Object, Error>}
         */
        async addAttachment(dataURI, record = {}, options = {}) {
            const { permissions } = options;
            const id = record.id || v4();
            const path = this._endpoints.attachment(this.bucket.name, this.name, id);
            const { last_modified } = Object.assign(Object.assign({}, record), options);
            const addAttachmentRequest$1 = addAttachmentRequest(path, dataURI, { data: record, permissions }, {
                last_modified,
                filename: options.filename,
                gzipped: options.gzipped,
                headers: this._getHeaders(options),
                safe: this._getSafe(options),
            });
            await this.client.execute(addAttachmentRequest$1, {
                stringify: false,
                retry: this._getRetry(options),
            });
            return this.getRecord(id);
        }
        /**
         * Removes an attachment from a given record.
         *
         * @param  {Object}  recordId                The record id.
         * @param  {Object}  [options={}]            The options object.
         * @param  {Object}  [options.headers]       The headers object option.
         * @param  {Number}  [options.retry=0]       Number of retries to make
         *     when faced with transient errors.
         * @param  {Boolean} [options.safe]          The safe option.
         * @param  {Number}  [options.last_modified] The last_modified option.
         */
        async removeAttachment(recordId, options = {}) {
            const { last_modified } = options;
            const path = this._endpoints.attachment(this.bucket.name, this.name, recordId);
            const request = deleteRequest(path, {
                last_modified,
                headers: this._getHeaders(options),
                safe: this._getSafe(options),
            });
            return this.client.execute(request, {
                retry: this._getRetry(options),
            });
        }
        /**
         * Updates a record in current collection.
         *
         * @param  {Object}  record                  The record to update.
         * @param  {Object}  [options={}]            The options object.
         * @param  {Object}  [options.headers]       The headers object option.
         * @param  {Number}  [options.retry=0]       Number of retries to make
         *     when faced with transient errors.
         * @param  {Boolean} [options.safe]          The safe option.
         * @param  {Number}  [options.last_modified] The last_modified option.
         * @param  {Object}  [options.permissions]   The permissions option.
         * @return {Promise<Object, Error>}
         */
        async updateRecord(record, options = {}) {
            if (!isObject(record)) {
                throw new Error("A record object is required.");
            }
            if (!record.id) {
                throw new Error("A record id is required.");
            }
            const { permissions } = options;
            const { last_modified } = Object.assign(Object.assign({}, record), options);
            const path = this._endpoints.record(this.bucket.name, this.name, record.id);
            const request = updateRequest(path, { data: record, permissions }, {
                headers: this._getHeaders(options),
                safe: this._getSafe(options),
                last_modified,
                patch: !!options.patch,
            });
            return this.client.execute(request, {
                retry: this._getRetry(options),
            });
        }
        /**
         * Deletes a record from the current collection.
         *
         * @param  {Object|String} record                  The record to delete.
         * @param  {Object}        [options={}]            The options object.
         * @param  {Object}        [options.headers]       The headers object option.
         * @param  {Number}        [options.retry=0]       Number of retries to make
         *     when faced with transient errors.
         * @param  {Boolean}       [options.safe]          The safe option.
         * @param  {Number}        [options.last_modified] The last_modified option.
         * @return {Promise<Object, Error>}
         */
        async deleteRecord(record, options = {}) {
            const recordObj = toDataBody(record);
            if (!recordObj.id) {
                throw new Error("A record id is required.");
            }
            const { id } = recordObj;
            const { last_modified } = Object.assign(Object.assign({}, recordObj), options);
            const path = this._endpoints.record(this.bucket.name, this.name, id);
            const request = deleteRequest(path, {
                last_modified,
                headers: this._getHeaders(options),
                safe: this._getSafe(options),
            });
            return this.client.execute(request, {
                retry: this._getRetry(options),
            });
        }
        /**
         * Retrieves a record from the current collection.
         *
         * @param  {String} id                The record id to retrieve.
         * @param  {Object} [options={}]      The options object.
         * @param  {Object} [options.headers] The headers object option.
         * @param  {Object} [options.query]   Query parameters to pass in
         *     the request. This might be useful for features that aren't
         *     yet supported by this library.
         * @param  {Array}  [options.fields]  Limit response to
         *     just some fields.
         * @param  {Number} [options.retry=0] Number of retries to make
         *     when faced with transient errors.
         * @return {Promise<Object, Error>}
         */
        async getRecord(id, options = {}) {
            const path = this._endpoints.record(this.bucket.name, this.name, id);
            const request = { headers: this._getHeaders(options), path };
            return this.client.execute(request, {
                retry: this._getRetry(options),
                query: options.query,
                fields: options.fields,
            });
        }
        /**
         * Lists records from the current collection.
         *
         * Sorting is done by passing a `sort` string option:
         *
         * - The field to order the results by, prefixed with `-` for descending.
         * Default: `-last_modified`.
         *
         * @see http://kinto.readthedocs.io/en/stable/api/1.x/sorting.html
         *
         * Filtering is done by passing a `filters` option object:
         *
         * - `{fieldname: "value"}`
         * - `{min_fieldname: 4000}`
         * - `{in_fieldname: "1,2,3"}`
         * - `{not_fieldname: 0}`
         * - `{exclude_fieldname: "0,1"}`
         *
         * @see http://kinto.readthedocs.io/en/stable/api/1.x/filtering.html
         *
         * Paginating is done by passing a `limit` option, then calling the `next()`
         * method from the resolved result object to fetch the next page, if any.
         *
         * @param  {Object}   [options={}]                    The options object.
         * @param  {Object}   [options.headers]               The headers object option.
         * @param  {Number}   [options.retry=0]               Number of retries to make
         *     when faced with transient errors.
         * @param  {Object}   [options.filters={}]            The filters object.
         * @param  {String}   [options.sort="-last_modified"] The sort field.
         * @param  {String}   [options.at]                    The timestamp to get a snapshot at.
         * @param  {String}   [options.limit=null]            The limit field.
         * @param  {String}   [options.pages=1]               The number of result pages to aggregate.
         * @param  {Number}   [options.since=null]            Only retrieve records modified since the provided timestamp.
         * @param  {Array}    [options.fields]                Limit response to just some fields.
         * @return {Promise<Object, Error>}
         */
        async listRecords(options = {}) {
            const path = this._endpoints.record(this.bucket.name, this.name);
            if (options.at) {
                return this.getSnapshot(options.at);
            }
            else {
                return this.client.paginatedList(path, options, {
                    headers: this._getHeaders(options),
                    retry: this._getRetry(options),
                });
            }
        }
        /**
         * @private
         */
        async isHistoryComplete() {
            // We consider that if we have the collection creation event part of the
            // history, then all records change events have been tracked.
            const { data: [oldestHistoryEntry], } = await this.bucket.listHistory({
                limit: 1,
                filters: {
                    action: "create",
                    resource_name: "collection",
                    collection_id: this.name,
                },
            });
            return !!oldestHistoryEntry;
        }
        /**
         * @private
         */
        async listChangesBackTo(at) {
            // Ensure we have enough history data to retrieve the complete list of
            // changes.
            if (!(await this.isHistoryComplete())) {
                throw new Error("Computing a snapshot is only possible when the full history for a " +
                    "collection is available. Here, the history plugin seems to have " +
                    "been enabled after the creation of the collection.");
            }
            const { data: changes } = await this.bucket.listHistory({
                pages: Infinity,
                sort: "-target.data.last_modified",
                filters: {
                    resource_name: "record",
                    collection_id: this.name,
                    "max_target.data.last_modified": String(at),
                },
            });
            return changes;
        }
        /**
         * @private
         */
        async getSnapshot(at) {
            if (!at || !Number.isInteger(at) || at <= 0) {
                throw new Error("Invalid argument, expected a positive integer.");
            }
            // Retrieve history and check it covers the required time range.
            const changes = await this.listChangesBackTo(at);
            // Replay changes to compute the requested snapshot.
            const seenIds = new Set();
            let snapshot = [];
            for (const { action, target: { data: record }, } of changes) {
                if (action == "delete") {
                    seenIds.add(record.id); // ensure not reprocessing deleted entries
                    snapshot = snapshot.filter((r) => r.id !== record.id);
                }
                else if (!seenIds.has(record.id)) {
                    seenIds.add(record.id);
                    snapshot.push(record);
                }
            }
            return {
                last_modified: String(at),
                data: snapshot.sort((a, b) => b.last_modified - a.last_modified),
                next: () => {
                    throw new Error("Snapshots don't support pagination");
                },
                hasNextPage: false,
                totalRecords: snapshot.length,
            };
        }
        /**
         * Performs batch operations at the current collection level.
         *
         * @param  {Function} fn                   The batch operation function.
         * @param  {Object}   [options={}]         The options object.
         * @param  {Object}   [options.headers]    The headers object option.
         * @param  {Boolean}  [options.safe]       The safe option.
         * @param  {Number}   [options.retry]      The retry option.
         * @param  {Boolean}  [options.aggregate]  Produces a grouped result object.
         * @return {Promise<Object, Error>}
         */
        async batch(fn, options = {}) {
            return this.client.batch(fn, {
                bucket: this.bucket.name,
                collection: this.name,
                headers: this._getHeaders(options),
                retry: this._getRetry(options),
                safe: this._getSafe(options),
                aggregate: !!options.aggregate,
            });
        }
    }
    __decorate([
        capable(["attachments"])
    ], Collection.prototype, "addAttachment", null);
    __decorate([
        capable(["attachments"])
    ], Collection.prototype, "removeAttachment", null);
    __decorate([
        capable(["history"])
    ], Collection.prototype, "getSnapshot", null);

    /**
     * Abstract representation of a selected bucket.
     *
     */
    class Bucket {
        /**
         * Constructor.
         *
         * @param  {KintoClient} client            The client instance.
         * @param  {String}      name              The bucket name.
         * @param  {Object}      [options={}]      The headers object option.
         * @param  {Object}      [options.headers] The headers object option.
         * @param  {Boolean}     [options.safe]    The safe option.
         * @param  {Number}      [options.retry]   The retry option.
         */
        constructor(client, name, options = {}) {
            /**
             * @ignore
             */
            this.client = client;
            /**
             * The bucket name.
             * @type {String}
             */
            this.name = name;
            this._endpoints = client.endpoints;
            /**
             * @ignore
             */
            this._headers = options.headers || {};
            this._retry = options.retry || 0;
            this._safe = !!options.safe;
        }
        get execute() {
            return this.client.execute.bind(this.client);
        }
        get headers() {
            return this._headers;
        }
        /**
         * Get the value of "headers" for a given request, merging the
         * per-request headers with our own "default" headers.
         *
         * @private
         */
        _getHeaders(options) {
            return Object.assign(Object.assign({}, this._headers), options.headers);
        }
        /**
         * Get the value of "safe" for a given request, using the
         * per-request option if present or falling back to our default
         * otherwise.
         *
         * @private
         * @param {Object} options The options for a request.
         * @returns {Boolean}
         */
        _getSafe(options) {
            return Object.assign({ safe: this._safe }, options).safe;
        }
        /**
         * As _getSafe, but for "retry".
         *
         * @private
         */
        _getRetry(options) {
            return Object.assign({ retry: this._retry }, options).retry;
        }
        /**
         * Selects a collection.
         *
         * @param  {String}  name              The collection name.
         * @param  {Object}  [options={}]      The options object.
         * @param  {Object}  [options.headers] The headers object option.
         * @param  {Boolean} [options.safe]    The safe option.
         * @return {Collection}
         */
        collection(name, options = {}) {
            return new Collection(this.client, this, name, {
                headers: this._getHeaders(options),
                retry: this._getRetry(options),
                safe: this._getSafe(options),
            });
        }
        /**
         * Retrieves the ETag of the collection list, for use with the `since` filtering option.
         *
         * @param  {Object} [options={}]      The options object.
         * @param  {Object} [options.headers] The headers object option.
         * @param  {Number} [options.retry=0] Number of retries to make
         *     when faced with transient errors.
         * @return {Promise<String, Error>}
         */
        async getCollectionsTimestamp(options = {}) {
            const path = this._endpoints.collection(this.name);
            const request = {
                headers: this._getHeaders(options),
                path,
                method: "HEAD",
            };
            const { headers } = (await this.client.execute(request, {
                raw: true,
                retry: this._getRetry(options),
            }));
            return headers.get("ETag");
        }
        /**
         * Retrieves the ETag of the group list, for use with the `since` filtering option.
         *
         * @param  {Object} [options={}]      The options object.
         * @param  {Object} [options.headers] The headers object option.
         * @param  {Number} [options.retry=0] Number of retries to make
         *     when faced with transient errors.
         * @return {Promise<String, Error>}
         */
        async getGroupsTimestamp(options = {}) {
            const path = this._endpoints.group(this.name);
            const request = {
                headers: this._getHeaders(options),
                path,
                method: "HEAD",
            };
            const { headers } = (await this.client.execute(request, {
                raw: true,
                retry: this._getRetry(options),
            }));
            return headers.get("ETag");
        }
        /**
         * Retrieves bucket data.
         *
         * @param  {Object} [options={}]      The options object.
         * @param  {Object} [options.headers] The headers object option.
         * @param  {Object} [options.query]   Query parameters to pass in
         *     the request. This might be useful for features that aren't
         *     yet supported by this library.
         * @param  {Array}  [options.fields]  Limit response to
         *     just some fields.
         * @param  {Number} [options.retry=0] Number of retries to make
         *     when faced with transient errors.
         * @return {Promise<Object, Error>}
         */
        async getData(options = {}) {
            const path = this._endpoints.bucket(this.name);
            const request = {
                headers: this._getHeaders(options),
                path,
            };
            const { data } = (await this.client.execute(request, {
                retry: this._getRetry(options),
                query: options.query,
                fields: options.fields,
            }));
            return data;
        }
        /**
         * Set bucket data.
         * @param  {Object}  data                    The bucket data object.
         * @param  {Object}  [options={}]            The options object.
         * @param  {Object}  [options.headers={}]    The headers object option.
         * @param  {Boolean} [options.safe]          The safe option.
         * @param  {Number}  [options.retry=0]       Number of retries to make
         *     when faced with transient errors.
         * @param  {Boolean} [options.patch]         The patch option.
         * @param  {Number}  [options.last_modified] The last_modified option.
         * @return {Promise<Object, Error>}
         */
        async setData(data, options = {}) {
            if (!isObject(data)) {
                throw new Error("A bucket object is required.");
            }
            const bucket = Object.assign(Object.assign({}, data), { id: this.name });
            // For default bucket, we need to drop the id from the data object.
            // Bug in Kinto < 3.1.1
            const bucketId = bucket.id;
            if (bucket.id === "default") {
                delete bucket.id;
            }
            const path = this._endpoints.bucket(bucketId);
            const { patch, permissions } = options;
            const { last_modified } = Object.assign(Object.assign({}, data), options);
            const request = updateRequest(path, { data: bucket, permissions }, {
                last_modified,
                patch,
                headers: this._getHeaders(options),
                safe: this._getSafe(options),
            });
            return this.client.execute(request, {
                retry: this._getRetry(options),
            });
        }
        /**
         * Retrieves the list of history entries in the current bucket.
         *
         * @param  {Object} [options={}]      The options object.
         * @param  {Object} [options.headers] The headers object option.
         * @param  {Number} [options.retry=0] Number of retries to make
         *     when faced with transient errors.
         * @return {Promise<Array<Object>, Error>}
         */
        async listHistory(options = {}) {
            const path = this._endpoints.history(this.name);
            return this.client.paginatedList(path, options, {
                headers: this._getHeaders(options),
                retry: this._getRetry(options),
            });
        }
        /**
         * Retrieves the list of collections in the current bucket.
         *
         * @param  {Object} [options={}]      The options object.
         * @param  {Object} [options.filters={}] The filters object.
         * @param  {Object} [options.headers] The headers object option.
         * @param  {Number} [options.retry=0] Number of retries to make
         *     when faced with transient errors.
         * @param  {Array}  [options.fields]  Limit response to
         *     just some fields.
         * @return {Promise<Array<Object>, Error>}
         */
        async listCollections(options = {}) {
            const path = this._endpoints.collection(this.name);
            return this.client.paginatedList(path, options, {
                headers: this._getHeaders(options),
                retry: this._getRetry(options),
            });
        }
        /**
         * Creates a new collection in current bucket.
         *
         * @param  {String|undefined}  id          The collection id.
         * @param  {Object}  [options={}]          The options object.
         * @param  {Boolean} [options.safe]        The safe option.
         * @param  {Object}  [options.headers]     The headers object option.
         * @param  {Number}  [options.retry=0]     Number of retries to make
         *     when faced with transient errors.
         * @param  {Object}  [options.permissions] The permissions object.
         * @param  {Object}  [options.data]        The data object.
         * @return {Promise<Object, Error>}
         */
        async createCollection(id, options = {}) {
            const { permissions, data = {} } = options;
            data.id = id;
            const path = this._endpoints.collection(this.name, id);
            const request = createRequest(path, { data, permissions }, {
                headers: this._getHeaders(options),
                safe: this._getSafe(options),
            });
            return this.client.execute(request, {
                retry: this._getRetry(options),
            });
        }
        /**
         * Deletes a collection from the current bucket.
         *
         * @param  {Object|String} collection              The collection to delete.
         * @param  {Object}        [options={}]            The options object.
         * @param  {Object}        [options.headers]       The headers object option.
         * @param  {Number}        [options.retry=0]       Number of retries to make
         *     when faced with transient errors.
         * @param  {Boolean}       [options.safe]          The safe option.
         * @param  {Number}        [options.last_modified] The last_modified option.
         * @return {Promise<Object, Error>}
         */
        async deleteCollection(collection, options = {}) {
            const collectionObj = toDataBody(collection);
            if (!collectionObj.id) {
                throw new Error("A collection id is required.");
            }
            const { id } = collectionObj;
            const { last_modified } = Object.assign(Object.assign({}, collectionObj), options);
            const path = this._endpoints.collection(this.name, id);
            const request = deleteRequest(path, {
                last_modified,
                headers: this._getHeaders(options),
                safe: this._getSafe(options),
            });
            return this.client.execute(request, {
                retry: this._getRetry(options),
            });
        }
        /**
         * Retrieves the list of groups in the current bucket.
         *
         * @param  {Object} [options={}]      The options object.
         * @param  {Object} [options.filters={}] The filters object.
         * @param  {Object} [options.headers] The headers object option.
         * @param  {Number} [options.retry=0] Number of retries to make
         *     when faced with transient errors.
         * @param  {Array}  [options.fields]  Limit response to
         *     just some fields.
         * @return {Promise<Array<Object>, Error>}
         */
        async listGroups(options = {}) {
            const path = this._endpoints.group(this.name);
            return this.client.paginatedList(path, options, {
                headers: this._getHeaders(options),
                retry: this._getRetry(options),
            });
        }
        /**
         * Fetches a group in current bucket.
         *
         * @param  {String} id                The group id.
         * @param  {Object} [options={}]      The options object.
         * @param  {Object} [options.headers] The headers object option.
         * @param  {Number} [options.retry=0] Number of retries to make
         *     when faced with transient errors.
         * @param  {Object} [options.query]   Query parameters to pass in
         *     the request. This might be useful for features that aren't
         *     yet supported by this library.
         * @param  {Array}  [options.fields]  Limit response to
         *     just some fields.
         * @return {Promise<Object, Error>}
         */
        async getGroup(id, options = {}) {
            const path = this._endpoints.group(this.name, id);
            const request = {
                headers: this._getHeaders(options),
                path,
            };
            return this.client.execute(request, {
                retry: this._getRetry(options),
                query: options.query,
                fields: options.fields,
            });
        }
        /**
         * Creates a new group in current bucket.
         *
         * @param  {String|undefined}  id                    The group id.
         * @param  {Array<String>}     [members=[]]          The list of principals.
         * @param  {Object}            [options={}]          The options object.
         * @param  {Object}            [options.data]        The data object.
         * @param  {Object}            [options.permissions] The permissions object.
         * @param  {Boolean}           [options.safe]        The safe option.
         * @param  {Object}            [options.headers]     The headers object option.
         * @param  {Number}            [options.retry=0]     Number of retries to make
         *     when faced with transient errors.
         * @return {Promise<Object, Error>}
         */
        async createGroup(id, members = [], options = {}) {
            const data = Object.assign(Object.assign({}, options.data), { id,
                members });
            const path = this._endpoints.group(this.name, id);
            const { permissions } = options;
            const request = createRequest(path, { data, permissions }, {
                headers: this._getHeaders(options),
                safe: this._getSafe(options),
            });
            return this.client.execute(request, {
                retry: this._getRetry(options),
            });
        }
        /**
         * Updates an existing group in current bucket.
         *
         * @param  {Object}  group                   The group object.
         * @param  {Object}  [options={}]            The options object.
         * @param  {Object}  [options.data]          The data object.
         * @param  {Object}  [options.permissions]   The permissions object.
         * @param  {Boolean} [options.safe]          The safe option.
         * @param  {Object}  [options.headers]       The headers object option.
         * @param  {Number}  [options.retry=0]       Number of retries to make
         *     when faced with transient errors.
         * @param  {Number}  [options.last_modified] The last_modified option.
         * @return {Promise<Object, Error>}
         */
        async updateGroup(group, options = {}) {
            if (!isObject(group)) {
                throw new Error("A group object is required.");
            }
            if (!group.id) {
                throw new Error("A group id is required.");
            }
            const data = Object.assign(Object.assign({}, options.data), group);
            const path = this._endpoints.group(this.name, group.id);
            const { patch, permissions } = options;
            const { last_modified } = Object.assign(Object.assign({}, data), options);
            const request = updateRequest(path, { data, permissions }, {
                last_modified,
                patch,
                headers: this._getHeaders(options),
                safe: this._getSafe(options),
            });
            return this.client.execute(request, {
                retry: this._getRetry(options),
            });
        }
        /**
         * Deletes a group from the current bucket.
         *
         * @param  {Object|String} group                   The group to delete.
         * @param  {Object}        [options={}]            The options object.
         * @param  {Object}        [options.headers]       The headers object option.
         * @param  {Number}        [options.retry=0]       Number of retries to make
         *     when faced with transient errors.
         * @param  {Boolean}       [options.safe]          The safe option.
         * @param  {Number}        [options.last_modified] The last_modified option.
         * @return {Promise<Object, Error>}
         */
        async deleteGroup(group, options = {}) {
            const groupObj = toDataBody(group);
            const { id } = groupObj;
            const { last_modified } = Object.assign(Object.assign({}, groupObj), options);
            const path = this._endpoints.group(this.name, id);
            const request = deleteRequest(path, {
                last_modified,
                headers: this._getHeaders(options),
                safe: this._getSafe(options),
            });
            return this.client.execute(request, {
                retry: this._getRetry(options),
            });
        }
        /**
         * Retrieves the list of permissions for this bucket.
         *
         * @param  {Object} [options={}]      The options object.
         * @param  {Object} [options.headers] The headers object option.
         * @param  {Number} [options.retry=0] Number of retries to make
         *     when faced with transient errors.
         * @return {Promise<Object, Error>}
         */
        async getPermissions(options = {}) {
            const request = {
                headers: this._getHeaders(options),
                path: this._endpoints.bucket(this.name),
            };
            const { permissions } = (await this.client.execute(request, {
                retry: this._getRetry(options),
            }));
            return permissions;
        }
        /**
         * Replaces all existing bucket permissions with the ones provided.
         *
         * @param  {Object}  permissions             The permissions object.
         * @param  {Object}  [options={}]            The options object
         * @param  {Boolean} [options.safe]          The safe option.
         * @param  {Object}  [options.headers={}]    The headers object option.
         * @param  {Number}  [options.retry=0]       Number of retries to make
         *     when faced with transient errors.
         * @param  {Object}  [options.last_modified] The last_modified option.
         * @return {Promise<Object, Error>}
         */
        async setPermissions(permissions, options = {}) {
            if (!isObject(permissions)) {
                throw new Error("A permissions object is required.");
            }
            const path = this._endpoints.bucket(this.name);
            const { last_modified } = options;
            const data = { last_modified };
            const request = updateRequest(path, { data, permissions }, {
                headers: this._getHeaders(options),
                safe: this._getSafe(options),
            });
            return this.client.execute(request, {
                retry: this._getRetry(options),
            });
        }
        /**
         * Append principals to the bucket permissions.
         *
         * @param  {Object}  permissions             The permissions object.
         * @param  {Object}  [options={}]            The options object
         * @param  {Boolean} [options.safe]          The safe option.
         * @param  {Object}  [options.headers]       The headers object option.
         * @param  {Number}  [options.retry=0]       Number of retries to make
         *     when faced with transient errors.
         * @param  {Object}  [options.last_modified] The last_modified option.
         * @return {Promise<Object, Error>}
         */
        async addPermissions(permissions, options = {}) {
            if (!isObject(permissions)) {
                throw new Error("A permissions object is required.");
            }
            const path = this._endpoints.bucket(this.name);
            const { last_modified } = options;
            const request = jsonPatchPermissionsRequest(path, permissions, "add", {
                last_modified,
                headers: this._getHeaders(options),
                safe: this._getSafe(options),
            });
            return this.client.execute(request, {
                retry: this._getRetry(options),
            });
        }
        /**
         * Remove principals from the bucket permissions.
         *
         * @param  {Object}  permissions             The permissions object.
         * @param  {Object}  [options={}]            The options object
         * @param  {Boolean} [options.safe]          The safe option.
         * @param  {Object}  [options.headers]       The headers object option.
         * @param  {Number}  [options.retry=0]       Number of retries to make
         *     when faced with transient errors.
         * @param  {Object}  [options.last_modified] The last_modified option.
         * @return {Promise<Object, Error>}
         */
        async removePermissions(permissions, options = {}) {
            if (!isObject(permissions)) {
                throw new Error("A permissions object is required.");
            }
            const path = this._endpoints.bucket(this.name);
            const { last_modified } = options;
            const request = jsonPatchPermissionsRequest(path, permissions, "remove", {
                last_modified,
                headers: this._getHeaders(options),
                safe: this._getSafe(options),
            });
            return this.client.execute(request, {
                retry: this._getRetry(options),
            });
        }
        /**
         * Performs batch operations at the current bucket level.
         *
         * @param  {Function} fn                   The batch operation function.
         * @param  {Object}   [options={}]         The options object.
         * @param  {Object}   [options.headers]    The headers object option.
         * @param  {Boolean}  [options.safe]       The safe option.
         * @param  {Number}   [options.retry=0]    The retry option.
         * @param  {Boolean}  [options.aggregate]  Produces a grouped result object.
         * @return {Promise<Object, Error>}
         */
        async batch(fn, options = {}) {
            return this.client.batch(fn, {
                bucket: this.name,
                headers: this._getHeaders(options),
                retry: this._getRetry(options),
                safe: this._getSafe(options),
                aggregate: !!options.aggregate,
            });
        }
    }
    __decorate([
        capable(["history"])
    ], Bucket.prototype, "listHistory", null);

    /**
     * Currently supported protocol version.
     * @type {String}
     */
    const SUPPORTED_PROTOCOL_VERSION = "v1";
    /**
     * High level HTTP client for the Kinto API.
     *
     * @example
     * const client = new KintoClient("https://kinto.dev.mozaws.net/v1");
     * client.bucket("default")
     *    .collection("my-blog")
     *    .createRecord({title: "First article"})
     *   .then(console.log.bind(console))
     *   .catch(console.error.bind(console));
     */
    class KintoClientBase {
        /**
         * Constructor.
         *
         * @param  {String}       remote  The remote URL.
         * @param  {Object}       [options={}]                  The options object.
         * @param  {Boolean}      [options.safe=true]           Adds concurrency headers to every requests.
         * @param  {EventEmitter} [options.events=EventEmitter] The events handler instance.
         * @param  {Object}       [options.headers={}]          The key-value headers to pass to each request.
         * @param  {Object}       [options.retry=0]             Number of retries when request fails (default: 0)
         * @param  {String}       [options.bucket="default"]    The default bucket to use.
         * @param  {String}       [options.requestMode="cors"]  The HTTP request mode (from ES6 fetch spec).
         * @param  {Number}       [options.timeout=null]        The request timeout in ms, if any.
         */
        constructor(remote, options) {
            if (typeof remote !== "string" || !remote.length) {
                throw new Error("Invalid remote URL: " + remote);
            }
            if (remote[remote.length - 1] === "/") {
                remote = remote.slice(0, -1);
            }
            this._backoffReleaseTime = null;
            this._requests = [];
            this._isBatch = !!options.batch;
            this._retry = options.retry || 0;
            this._safe = !!options.safe;
            this._headers = options.headers || {};
            // public properties
            /**
             * The remote server base URL.
             * @type {String}
             */
            this.remote = remote;
            /**
             * Current server information.
             * @ignore
             * @type {Object|null}
             */
            this.serverInfo = null;
            /**
             * The event emitter instance. Should comply with the `EventEmitter`
             * interface.
             * @ignore
             * @type {Class}
             */
            this.events = options.events;
            this.endpoints = ENDPOINTS;
            const { requestMode, timeout } = options;
            /**
             * The HTTP instance.
             * @ignore
             * @type {HTTP}
             */
            this.http = new HTTP(this.events, { requestMode, timeout });
            this._registerHTTPEvents();
        }
        /**
         * The remote endpoint base URL. Setting the value will also extract and
         * validate the version.
         * @type {String}
         */
        get remote() {
            return this._remote;
        }
        /**
         * @ignore
         */
        set remote(url) {
            let version;
            try {
                version = url.match(/\/(v\d+)\/?$/)[1];
            }
            catch (err) {
                throw new Error("The remote URL must contain the version: " + url);
            }
            if (version !== SUPPORTED_PROTOCOL_VERSION) {
                throw new Error(`Unsupported protocol version: ${version}`);
            }
            this._remote = url;
            this._version = version;
        }
        /**
         * The current server protocol version, eg. `v1`.
         * @type {String}
         */
        get version() {
            return this._version;
        }
        /**
         * Backoff remaining time, in milliseconds. Defaults to zero if no backoff is
         * ongoing.
         *
         * @type {Number}
         */
        get backoff() {
            const currentTime = new Date().getTime();
            if (this._backoffReleaseTime && currentTime < this._backoffReleaseTime) {
                return this._backoffReleaseTime - currentTime;
            }
            return 0;
        }
        /**
         * Registers HTTP events.
         * @private
         */
        _registerHTTPEvents() {
            // Prevent registering event from a batch client instance
            if (!this._isBatch && this.events) {
                this.events.on("backoff", (backoffMs) => {
                    this._backoffReleaseTime = backoffMs;
                });
            }
        }
        /**
         * Retrieve a bucket object to perform operations on it.
         *
         * @param  {String}  name              The bucket name.
         * @param  {Object}  [options={}]      The request options.
         * @param  {Boolean} [options.safe]    The resulting safe option.
         * @param  {Number}  [options.retry]   The resulting retry option.
         * @param  {Object}  [options.headers] The extended headers object option.
         * @return {Bucket}
         */
        bucket(name, options = {}) {
            return new Bucket(this, name, {
                headers: this._getHeaders(options),
                safe: this._getSafe(options),
                retry: this._getRetry(options),
            });
        }
        /**
         * Set client "headers" for every request, updating previous headers (if any).
         *
         * @param {Object} headers The headers to merge with existing ones.
         */
        setHeaders(headers) {
            this._headers = Object.assign(Object.assign({}, this._headers), headers);
            this.serverInfo = null;
        }
        /**
         * Get the value of "headers" for a given request, merging the
         * per-request headers with our own "default" headers.
         *
         * Note that unlike other options, headers aren't overridden, but
         * merged instead.
         *
         * @private
         * @param {Object} options The options for a request.
         * @returns {Object}
         */
        _getHeaders(options) {
            return Object.assign(Object.assign({}, this._headers), options.headers);
        }
        /**
         * Get the value of "safe" for a given request, using the
         * per-request option if present or falling back to our default
         * otherwise.
         *
         * @private
         * @param {Object} options The options for a request.
         * @returns {Boolean}
         */
        _getSafe(options) {
            return Object.assign({ safe: this._safe }, options).safe;
        }
        /**
         * As _getSafe, but for "retry".
         *
         * @private
         */
        _getRetry(options) {
            return Object.assign({ retry: this._retry }, options).retry;
        }
        /**
         * Retrieves the server's "hello" endpoint. This endpoint reveals
         * server capabilities and settings as well as telling the client
         * "who they are" according to their given authorization headers.
         *
         * @private
         * @param  {Object}  [options={}] The request options.
         * @param  {Object}  [options.headers={}] Headers to use when making
         *     this request.
         * @param  {Number}  [options.retry=0]    Number of retries to make
         *     when faced with transient errors.
         * @return {Promise<Object, Error>}
         */
        async _getHello(options = {}) {
            const path = this.remote + ENDPOINTS.root();
            const { json } = await this.http.request(path, { headers: this._getHeaders(options) }, { retry: this._getRetry(options) });
            return json;
        }
        /**
         * Retrieves server information and persist them locally. This operation is
         * usually performed a single time during the instance lifecycle.
         *
         * @param  {Object}  [options={}] The request options.
         * @param  {Number}  [options.retry=0]    Number of retries to make
         *     when faced with transient errors.
         * @return {Promise<Object, Error>}
         */
        async fetchServerInfo(options = {}) {
            if (this.serverInfo) {
                return this.serverInfo;
            }
            this.serverInfo = await this._getHello({ retry: this._getRetry(options) });
            return this.serverInfo;
        }
        /**
         * Retrieves Kinto server settings.
         *
         * @param  {Object}  [options={}] The request options.
         * @param  {Number}  [options.retry=0]    Number of retries to make
         *     when faced with transient errors.
         * @return {Promise<Object, Error>}
         */
        async fetchServerSettings(options = {}) {
            const { settings } = await this.fetchServerInfo(options);
            return settings;
        }
        /**
         * Retrieve server capabilities information.
         *
         * @param  {Object}  [options={}] The request options.
         * @param  {Number}  [options.retry=0]    Number of retries to make
         *     when faced with transient errors.
         * @return {Promise<Object, Error>}
         */
        async fetchServerCapabilities(options = {}) {
            const { capabilities } = await this.fetchServerInfo(options);
            return capabilities;
        }
        /**
         * Retrieve authenticated user information.
         *
         * @param  {Object}  [options={}] The request options.
         * @param  {Object}  [options.headers={}] Headers to use when making
         *     this request.
         * @param  {Number}  [options.retry=0]    Number of retries to make
         *     when faced with transient errors.
         * @return {Promise<Object, Error>}
         */
        async fetchUser(options = {}) {
            const { user } = await this._getHello(options);
            return user;
        }
        /**
         * Retrieve authenticated user information.
         *
         * @param  {Object}  [options={}] The request options.
         * @param  {Number}  [options.retry=0]    Number of retries to make
         *     when faced with transient errors.
         * @return {Promise<Object, Error>}
         */
        async fetchHTTPApiVersion(options = {}) {
            const { http_api_version } = await this.fetchServerInfo(options);
            return http_api_version;
        }
        /**
         * Process batch requests, chunking them according to the batch_max_requests
         * server setting when needed.
         *
         * @param  {Array}  requests     The list of batch subrequests to perform.
         * @param  {Object} [options={}] The options object.
         * @return {Promise<Object, Error>}
         */
        async _batchRequests(requests, options = {}) {
            const headers = this._getHeaders(options);
            if (!requests.length) {
                return [];
            }
            const serverSettings = await this.fetchServerSettings({
                retry: this._getRetry(options),
            });
            const maxRequests = serverSettings["batch_max_requests"];
            if (maxRequests && requests.length > maxRequests) {
                const chunks = partition(requests, maxRequests);
                const results = [];
                for (const chunk of chunks) {
                    const result = await this._batchRequests(chunk, options);
                    results.push(...result);
                }
                return results;
            }
            const { responses } = (await this.execute({
                // FIXME: is this really necessary, since it's also present in
                // the "defaults"?
                headers,
                path: ENDPOINTS.batch(),
                method: "POST",
                body: {
                    defaults: { headers },
                    requests,
                },
            }, { retry: this._getRetry(options) }));
            return responses;
        }
        /**
         * Sends batch requests to the remote server.
         *
         * Note: Reserved for internal use only.
         *
         * @ignore
         * @param  {Function} fn                        The function to use for describing batch ops.
         * @param  {Object}   [options={}]              The options object.
         * @param  {Boolean}  [options.safe]            The safe option.
         * @param  {Number}   [options.retry]           The retry option.
         * @param  {String}   [options.bucket]          The bucket name option.
         * @param  {String}   [options.collection]      The collection name option.
         * @param  {Object}   [options.headers]         The headers object option.
         * @param  {Boolean}  [options.aggregate=false] Produces an aggregated result object.
         * @return {Promise<Object, Error>}
         */
        async batch(fn, options = {}) {
            const rootBatch = new KintoClientBase(this.remote, {
                events: this.events,
                batch: true,
                safe: this._getSafe(options),
                retry: this._getRetry(options),
            });
            if (options.bucket && options.collection) {
                fn(rootBatch.bucket(options.bucket).collection(options.collection));
            }
            else if (options.bucket) {
                fn(rootBatch.bucket(options.bucket));
            }
            else {
                fn(rootBatch);
            }
            const responses = await this._batchRequests(rootBatch._requests, options);
            if (options.aggregate) {
                return aggregate(responses, rootBatch._requests);
            }
            else {
                return responses;
            }
        }
        /**
         * Executes an atomic HTTP request.
         *
         * @param  {Object}  request             The request object.
         * @param  {String}  request.path        The path to fetch, relative
         *     to the Kinto server root.
         * @param  {String}  [request.method="GET"] The method to use in the
         *     request.
         * @param  {Body}    [request.body]      The request body.
         * @param  {Object}  [request.headers={}] The request headers.
         * @param  {Object}  [options={}]        The options object.
         * @param  {Boolean} [options.raw=false] If true, resolve with full response
         * @param  {Boolean} [options.stringify=true] If true, serialize body data to
         * @param  {Number}  [options.retry=0]   The number of times to
         *     retry a request if the server responds with Retry-After.
         * JSON.
         * @return {Promise<Object, Error>}
         */
        async execute(request, options = {}) {
            const { raw = false, stringify = true } = options;
            // If we're within a batch, add the request to the stack to send at once.
            if (this._isBatch) {
                this._requests.push(request);
                // Resolve with a message in case people attempt at consuming the result
                // from within a batch operation.
                const msg = ("This result is generated from within a batch " +
                    "operation and should not be consumed.");
                return raw
                    ? { status: 0, json: msg, headers: new Headers() }
                    : msg;
            }
            const uri = this.remote + addEndpointOptions(request.path, options);
            const result = await this.http.request(uri, cleanUndefinedProperties({
                // Limit requests to only those parts that would be allowed in
                // a batch request -- don't pass through other fancy fetch()
                // options like integrity, redirect, mode because they will
                // break on a batch request.  A batch request only allows
                // headers, method, path (above), and body.
                method: request.method,
                headers: request.headers,
                body: stringify ? JSON.stringify(request.body) : request.body,
            }), { retry: this._getRetry(options) });
            return raw ? result : result.json;
        }
        /**
         * Fetch some pages from a paginated list, following the `next-page`
         * header automatically until we have fetched the requested number
         * of pages. Return a response with a `.next()` method that can be
         * called to fetch more results.
         *
         * @private
         * @param  {String}  path
         *     The path to make the request to.
         * @param  {Object}  params
         *     The parameters to use when making the request.
         * @param  {String}  [params.sort="-last_modified"]
         *     The sorting order to use when fetching.
         * @param  {Object}  [params.filters={}]
         *     The filters to send in the request.
         * @param  {Number}  [params.limit=undefined]
         *     The limit to send in the request. Undefined means no limit.
         * @param  {Number}  [params.pages=undefined]
         *     The number of pages to fetch. Undefined means one page. Pass
         *     Infinity to fetch everything.
         * @param  {String}  [params.since=undefined]
         *     The ETag from which to start fetching.
         * @param  {Array}   [params.fields]
         *     Limit response to just some fields.
         * @param  {Object}  [options={}]
         *     Additional request-level parameters to use in all requests.
         * @param  {Object}  [options.headers={}]
         *     Headers to use during all requests.
         * @param  {Number}  [options.retry=0]
         *     Number of times to retry each request if the server responds
         *     with Retry-After.
         */
        async paginatedList(path, params = {}, options = {}) {
            // FIXME: this is called even in batch requests, which doesn't
            // make any sense (since all batch requests get a "dummy"
            // response; see execute() above).
            const { sort, filters, limit, pages, since, fields } = Object.assign({ sort: "-last_modified" }, params);
            // Safety/Consistency check on ETag value.
            if (since && typeof since !== "string") {
                throw new Error(`Invalid value for since (${since}), should be ETag value.`);
            }
            const query = Object.assign(Object.assign({}, filters), { _sort: sort, _limit: limit, _since: since });
            if (fields) {
                query._fields = fields;
            }
            const querystring = qsify(query);
            let results = [], current = 0;
            const next = async function (nextPage) {
                if (!nextPage) {
                    throw new Error("Pagination exhausted.");
                }
                return processNextPage(nextPage);
            };
            const processNextPage = async (nextPage) => {
                const { headers } = options;
                return handleResponse(await this.http.request(nextPage, { headers }));
            };
            const pageResults = (results, nextPage, etag) => {
                // ETag string is supposed to be opaque and stored «as-is».
                // ETag header values are quoted (because of * and W/"foo").
                return {
                    last_modified: etag ? etag.replace(/"/g, "") : etag,
                    data: results,
                    next: next.bind(null, nextPage),
                    hasNextPage: !!nextPage,
                    totalRecords: -1,
                };
            };
            const handleResponse = async function ({ headers, json, }) {
                const nextPage = headers.get("Next-Page");
                const etag = headers.get("ETag");
                if (!pages) {
                    return pageResults(json.data, nextPage, etag);
                }
                // Aggregate new results with previous ones
                results = results.concat(json.data);
                current += 1;
                if (current >= pages || !nextPage) {
                    // Pagination exhausted
                    return pageResults(results, nextPage, etag);
                }
                // Follow next page
                return processNextPage(nextPage);
            };
            return handleResponse((await this.execute(
            // N.B.: This doesn't use _getHeaders, because all calls to
            // `paginatedList` are assumed to come from calls that already
            // have headers merged at e.g. the bucket or collection level.
            {
                headers: options.headers ? options.headers : {},
                path: path + "?" + querystring,
            },
            // N.B. This doesn't use _getRetry, because all calls to
            // `paginatedList` are assumed to come from calls that already
            // used `_getRetry` at e.g. the bucket or collection level.
            { raw: true, retry: options.retry || 0 })));
        }
        /**
         * Lists all permissions.
         *
         * @param  {Object} [options={}]      The options object.
         * @param  {Object} [options.headers={}] Headers to use when making
         *     this request.
         * @param  {Number} [options.retry=0]    Number of retries to make
         *     when faced with transient errors.
         * @return {Promise<Object[], Error>}
         */
        async listPermissions(options = {}) {
            const path = ENDPOINTS.permissions();
            // Ensure the default sort parameter is something that exists in permissions
            // entries, as `last_modified` doesn't; here, we pick "id".
            const paginationOptions = Object.assign({ sort: "id" }, options);
            return this.paginatedList(path, paginationOptions, {
                headers: this._getHeaders(options),
                retry: this._getRetry(options),
            });
        }
        /**
         * Retrieves the list of buckets.
         *
         * @param  {Object} [options={}]      The options object.
         * @param  {Object} [options.headers={}] Headers to use when making
         *     this request.
         * @param  {Number} [options.retry=0]    Number of retries to make
         *     when faced with transient errors.
         * @param  {Object} [options.filters={}] The filters object.
         * @param  {Array}  [options.fields]     Limit response to
         *     just some fields.
         * @return {Promise<Object[], Error>}
         */
        async listBuckets(options = {}) {
            const path = ENDPOINTS.bucket();
            return this.paginatedList(path, options, {
                headers: this._getHeaders(options),
                retry: this._getRetry(options),
            });
        }
        /**
         * Creates a new bucket on the server.
         *
         * @param  {String|null}  id                The bucket name (optional).
         * @param  {Object}       [options={}]      The options object.
         * @param  {Boolean}      [options.data]    The bucket data option.
         * @param  {Boolean}      [options.safe]    The safe option.
         * @param  {Object}       [options.headers] The headers object option.
         * @param  {Number}       [options.retry=0] Number of retries to make
         *     when faced with transient errors.
         * @return {Promise<Object, Error>}
         */
        async createBucket(id, options = {}) {
            const { data, permissions } = options;
            const _data = Object.assign(Object.assign({}, data), { id: id ? id : undefined });
            const path = _data.id ? ENDPOINTS.bucket(_data.id) : ENDPOINTS.bucket();
            return this.execute(createRequest(path, { data: _data, permissions }, {
                headers: this._getHeaders(options),
                safe: this._getSafe(options),
            }), { retry: this._getRetry(options) });
        }
        /**
         * Deletes a bucket from the server.
         *
         * @ignore
         * @param  {Object|String} bucket                  The bucket to delete.
         * @param  {Object}        [options={}]            The options object.
         * @param  {Boolean}       [options.safe]          The safe option.
         * @param  {Object}        [options.headers]       The headers object option.
         * @param  {Number}        [options.retry=0]       Number of retries to make
         *     when faced with transient errors.
         * @param  {Number}        [options.last_modified] The last_modified option.
         * @return {Promise<Object, Error>}
         */
        async deleteBucket(bucket, options = {}) {
            const bucketObj = toDataBody(bucket);
            if (!bucketObj.id) {
                throw new Error("A bucket id is required.");
            }
            const path = ENDPOINTS.bucket(bucketObj.id);
            const { last_modified } = Object.assign(Object.assign({}, bucketObj), options);
            return this.execute(deleteRequest(path, {
                last_modified,
                headers: this._getHeaders(options),
                safe: this._getSafe(options),
            }), { retry: this._getRetry(options) });
        }
        /**
         * Deletes all buckets on the server.
         *
         * @ignore
         * @param  {Object}  [options={}]            The options object.
         * @param  {Boolean} [options.safe]          The safe option.
         * @param  {Object}  [options.headers]       The headers object option.
         * @param  {Number}  [options.last_modified] The last_modified option.
         * @return {Promise<Object, Error>}
         */
        async deleteBuckets(options = {}) {
            const path = ENDPOINTS.bucket();
            return this.execute(deleteRequest(path, {
                last_modified: options.last_modified,
                headers: this._getHeaders(options),
                safe: this._getSafe(options),
            }), { retry: this._getRetry(options) });
        }
        async createAccount(username, password) {
            return this.execute(createRequest(`/accounts/${username}`, { data: { password } }, { method: "PUT" }));
        }
    }
    __decorate([
        nobatch("This operation is not supported within a batch operation.")
    ], KintoClientBase.prototype, "fetchServerSettings", null);
    __decorate([
        nobatch("This operation is not supported within a batch operation.")
    ], KintoClientBase.prototype, "fetchServerCapabilities", null);
    __decorate([
        nobatch("This operation is not supported within a batch operation.")
    ], KintoClientBase.prototype, "fetchUser", null);
    __decorate([
        nobatch("This operation is not supported within a batch operation.")
    ], KintoClientBase.prototype, "fetchHTTPApiVersion", null);
    __decorate([
        nobatch("Can't use batch within a batch!")
    ], KintoClientBase.prototype, "batch", null);
    __decorate([
        capable(["permissions_endpoint"])
    ], KintoClientBase.prototype, "listPermissions", null);
    __decorate([
        support("1.4", "2.0")
    ], KintoClientBase.prototype, "deleteBuckets", null);
    __decorate([
        capable(["accounts"])
    ], KintoClientBase.prototype, "createAccount", null);

    /*
     *
     * Licensed under the Apache License, Version 2.0 (the "License");
     * you may not use this file except in compliance with the License.
     * You may obtain a copy of the License at
     *
     *     http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing, software
     * distributed under the License is distributed on an "AS IS" BASIS,
     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     * See the License for the specific language governing permissions and
     * limitations under the License.
     */
    const { EventEmitter } = ChromeUtils.import("resource://gre/modules/EventEmitter.jsm");
    class KintoHttpClient extends KintoClientBase {
        constructor(remote, options = {}) {
            const events = {};
            EventEmitter.decorate(events);
            super(remote, Object.assign({ events: events }, options));
        }
    }
    KintoHttpClient.errors = errors;

    return KintoHttpClient;

})));