зеркало из https://github.com/mozilla/gecko-dev.git
462 строки
16 KiB
JavaScript
462 строки
16 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
|
|
* You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
"use strict";
|
|
|
|
this.EXPORTED_SYMBOLS = [
|
|
"TokenServerClient",
|
|
"TokenServerClientError",
|
|
"TokenServerClientNetworkError",
|
|
"TokenServerClientServerError",
|
|
];
|
|
|
|
var {classes: Cc, interfaces: Ci, utils: Cu, results: Cr} = Components;
|
|
|
|
Cu.import("resource://gre/modules/Services.jsm");
|
|
Cu.import("resource://gre/modules/Log.jsm");
|
|
Cu.import("resource://services-common/rest.js");
|
|
Cu.import("resource://services-common/observers.js");
|
|
|
|
const PREF_LOG_LEVEL = "services.common.log.logger.tokenserverclient";
|
|
|
|
/**
|
|
* Represents a TokenServerClient error that occurred on the client.
|
|
*
|
|
* This is the base type for all errors raised by client operations.
|
|
*
|
|
* @param message
|
|
* (string) Error message.
|
|
*/
|
|
this.TokenServerClientError = function TokenServerClientError(message) {
|
|
this.name = "TokenServerClientError";
|
|
this.message = message || "Client error.";
|
|
// Without explicitly setting .stack, all stacks from these errors will point
|
|
// to the "new Error()" call a few lines down, which isn't helpful.
|
|
this.stack = Error().stack;
|
|
}
|
|
TokenServerClientError.prototype = new Error();
|
|
TokenServerClientError.prototype.constructor = TokenServerClientError;
|
|
TokenServerClientError.prototype._toStringFields = function() {
|
|
return {message: this.message};
|
|
}
|
|
TokenServerClientError.prototype.toString = function() {
|
|
return this.name + "(" + JSON.stringify(this._toStringFields()) + ")";
|
|
}
|
|
TokenServerClientError.prototype.toJSON = function() {
|
|
let result = this._toStringFields();
|
|
result["name"] = this.name;
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Represents a TokenServerClient error that occurred in the network layer.
|
|
*
|
|
* @param error
|
|
* The underlying error thrown by the network layer.
|
|
*/
|
|
this.TokenServerClientNetworkError =
|
|
function TokenServerClientNetworkError(error) {
|
|
this.name = "TokenServerClientNetworkError";
|
|
this.error = error;
|
|
this.stack = Error().stack;
|
|
}
|
|
TokenServerClientNetworkError.prototype = new TokenServerClientError();
|
|
TokenServerClientNetworkError.prototype.constructor =
|
|
TokenServerClientNetworkError;
|
|
TokenServerClientNetworkError.prototype._toStringFields = function() {
|
|
return {error: this.error};
|
|
}
|
|
|
|
/**
|
|
* Represents a TokenServerClient error that occurred on the server.
|
|
*
|
|
* This type will be encountered for all non-200 response codes from the
|
|
* server. The type of error is strongly enumerated and is stored in the
|
|
* `cause` property. This property can have the following string values:
|
|
*
|
|
* conditions-required -- The server is requesting that the client
|
|
* agree to service conditions before it can obtain a token. The
|
|
* conditions that must be presented to the user and agreed to are in
|
|
* the `urls` mapping on the instance. Keys of this mapping are
|
|
* identifiers. Values are string URLs.
|
|
*
|
|
* invalid-credentials -- A token could not be obtained because
|
|
* the credentials presented by the client were invalid.
|
|
*
|
|
* unknown-service -- The requested service was not found.
|
|
*
|
|
* malformed-request -- The server rejected the request because it
|
|
* was invalid. If you see this, code in this file is likely wrong.
|
|
*
|
|
* malformed-response -- The response from the server was not what was
|
|
* expected.
|
|
*
|
|
* general -- A general server error has occurred. Clients should
|
|
* interpret this as an opaque failure.
|
|
*
|
|
* @param message
|
|
* (string) Error message.
|
|
*/
|
|
this.TokenServerClientServerError =
|
|
function TokenServerClientServerError(message, cause="general") {
|
|
this.now = new Date().toISOString(); // may be useful to diagnose time-skew issues.
|
|
this.name = "TokenServerClientServerError";
|
|
this.message = message || "Server error.";
|
|
this.cause = cause;
|
|
this.stack = Error().stack;
|
|
}
|
|
TokenServerClientServerError.prototype = new TokenServerClientError();
|
|
TokenServerClientServerError.prototype.constructor =
|
|
TokenServerClientServerError;
|
|
|
|
TokenServerClientServerError.prototype._toStringFields = function() {
|
|
let fields = {
|
|
now: this.now,
|
|
message: this.message,
|
|
cause: this.cause,
|
|
};
|
|
if (this.response) {
|
|
fields.response_body = this.response.body;
|
|
fields.response_headers = this.response.headers;
|
|
fields.response_status = this.response.status;
|
|
}
|
|
return fields;
|
|
};
|
|
|
|
/**
|
|
* Represents a client to the Token Server.
|
|
*
|
|
* http://docs.services.mozilla.com/token/index.html
|
|
*
|
|
* The Token Server supports obtaining tokens for arbitrary apps by
|
|
* constructing URI paths of the form <app>/<app_version>. However, the service
|
|
* discovery mechanism emphasizes the use of full URIs and tries to not force
|
|
* the client to manipulate URIs. This client currently enforces this practice
|
|
* by not implementing an API which would perform URI manipulation.
|
|
*
|
|
* If you are tempted to implement this API in the future, consider this your
|
|
* warning that you may be doing it wrong and that you should store full URIs
|
|
* instead.
|
|
*
|
|
* Areas to Improve:
|
|
*
|
|
* - The server sends a JSON response on error. The client does not currently
|
|
* parse this. It might be convenient if it did.
|
|
* - Currently most non-200 status codes are rolled into one error type. It
|
|
* might be helpful if callers had a richer API that communicated who was
|
|
* at fault (e.g. differentiating a 503 from a 401).
|
|
*/
|
|
this.TokenServerClient = function TokenServerClient() {
|
|
this._log = Log.repository.getLogger("Common.TokenServerClient");
|
|
let level = "Debug";
|
|
try {
|
|
level = Services.prefs.getCharPref(PREF_LOG_LEVEL);
|
|
} catch (ex) {}
|
|
this._log.level = Log.Level[level];
|
|
}
|
|
TokenServerClient.prototype = {
|
|
/**
|
|
* Logger instance.
|
|
*/
|
|
_log: null,
|
|
|
|
/**
|
|
* Obtain a token from a BrowserID assertion against a specific URL.
|
|
*
|
|
* This asynchronously obtains the token. The callback receives 2 arguments:
|
|
*
|
|
* (TokenServerClientError | null) If no token could be obtained, this
|
|
* will be a TokenServerClientError instance describing why. The
|
|
* type seen defines the type of error encountered. If an HTTP response
|
|
* was seen, a RESTResponse instance will be stored in the `response`
|
|
* property of this object. If there was no error and a token is
|
|
* available, this will be null.
|
|
*
|
|
* (map | null) On success, this will be a map containing the results from
|
|
* the server. If there was an error, this will be null. The map has the
|
|
* following properties:
|
|
*
|
|
* id (string) HTTP MAC public key identifier.
|
|
* key (string) HTTP MAC shared symmetric key.
|
|
* endpoint (string) URL where service can be connected to.
|
|
* uid (string) user ID for requested service.
|
|
* duration (string) the validity duration of the issued token.
|
|
*
|
|
* Terms of Service Acceptance
|
|
* ---------------------------
|
|
*
|
|
* Some services require users to accept terms of service before they can
|
|
* obtain a token. If a service requires ToS acceptance, the error passed
|
|
* to the callback will be a `TokenServerClientServerError` with the
|
|
* `cause` property set to "conditions-required". The `urls` property of that
|
|
* instance will be a map of string keys to string URL values. The user-agent
|
|
* should prompt the user to accept the content at these URLs.
|
|
*
|
|
* Clients signify acceptance of the terms of service by sending a token
|
|
* request with additional metadata. This is controlled by the
|
|
* `conditionsAccepted` argument to this function. Clients only need to set
|
|
* this flag once per service and the server remembers acceptance. If
|
|
* the conditions for the service change, the server may request
|
|
* clients agree to terms again. Therefore, clients should always be
|
|
* prepared to handle a conditions required response.
|
|
*
|
|
* Clients should not blindly send acceptance to conditions. Instead, clients
|
|
* should set `conditionsAccepted` if and only if the server asks for
|
|
* acceptance, the conditions are displayed to the user, and the user agrees
|
|
* to them.
|
|
*
|
|
* Example Usage
|
|
* -------------
|
|
*
|
|
* let client = new TokenServerClient();
|
|
* let assertion = getBrowserIDAssertionFromSomewhere();
|
|
* let url = "https://token.services.mozilla.com/1.0/sync/2.0";
|
|
*
|
|
* client.getTokenFromBrowserIDAssertion(url, assertion,
|
|
* function onResponse(error, result) {
|
|
* if (error) {
|
|
* if (error.cause == "conditions-required") {
|
|
* promptConditionsAcceptance(error.urls, function onAccept() {
|
|
* client.getTokenFromBrowserIDAssertion(url, assertion,
|
|
* onResponse, true);
|
|
* }
|
|
* return;
|
|
* }
|
|
*
|
|
* // Do other error handling.
|
|
* return;
|
|
* }
|
|
*
|
|
* let {
|
|
* id: id, key: key, uid: uid, endpoint: endpoint, duration: duration
|
|
* } = result;
|
|
* // Do stuff with data and carry on.
|
|
* });
|
|
*
|
|
* @param url
|
|
* (string) URL to fetch token from.
|
|
* @param assertion
|
|
* (string) BrowserID assertion to exchange token for.
|
|
* @param cb
|
|
* (function) Callback to be invoked with result of operation.
|
|
* @param conditionsAccepted
|
|
* (bool) Whether to send acceptance to service conditions.
|
|
*/
|
|
getTokenFromBrowserIDAssertion:
|
|
function getTokenFromBrowserIDAssertion(url, assertion, cb, addHeaders={}) {
|
|
if (!url) {
|
|
throw new TokenServerClientError("url argument is not valid.");
|
|
}
|
|
|
|
if (!assertion) {
|
|
throw new TokenServerClientError("assertion argument is not valid.");
|
|
}
|
|
|
|
if (!cb) {
|
|
throw new TokenServerClientError("cb argument is not valid.");
|
|
}
|
|
|
|
this._log.debug("Beginning BID assertion exchange: " + url);
|
|
|
|
let req = this.newRESTRequest(url);
|
|
req.setHeader("Accept", "application/json");
|
|
req.setHeader("Authorization", "BrowserID " + assertion);
|
|
|
|
for (let header in addHeaders) {
|
|
req.setHeader(header, addHeaders[header]);
|
|
}
|
|
|
|
let client = this;
|
|
req.get(function onResponse(error) {
|
|
if (error) {
|
|
cb(new TokenServerClientNetworkError(error), null);
|
|
return;
|
|
}
|
|
|
|
let self = this;
|
|
function callCallback(error, result) {
|
|
if (!cb) {
|
|
self._log.warn("Callback already called! Did it throw?");
|
|
return;
|
|
}
|
|
|
|
try {
|
|
cb(error, result);
|
|
} catch (ex) {
|
|
self._log.warn("Exception when calling user-supplied callback", ex);
|
|
}
|
|
|
|
cb = null;
|
|
}
|
|
|
|
try {
|
|
client._processTokenResponse(this.response, callCallback);
|
|
} catch (ex) {
|
|
this._log.warn("Error processing token server response", ex);
|
|
|
|
let error = new TokenServerClientError(ex);
|
|
error.response = this.response;
|
|
callCallback(error, null);
|
|
}
|
|
});
|
|
},
|
|
|
|
/**
|
|
* Handler to process token request responses.
|
|
*
|
|
* @param response
|
|
* RESTResponse from token HTTP request.
|
|
* @param cb
|
|
* The original callback passed to the public API.
|
|
*/
|
|
_processTokenResponse: function processTokenResponse(response, cb) {
|
|
this._log.debug("Got token response: " + response.status);
|
|
|
|
// Responses should *always* be JSON, even in the case of 4xx and 5xx
|
|
// errors. If we don't see JSON, the server is likely very unhappy.
|
|
let ct = response.headers["content-type"] || "";
|
|
if (ct != "application/json" && !ct.startsWith("application/json;")) {
|
|
this._log.warn("Did not receive JSON response. Misconfigured server?");
|
|
this._log.debug("Content-Type: " + ct);
|
|
this._log.debug("Body: " + response.body);
|
|
|
|
let error = new TokenServerClientServerError("Non-JSON response.",
|
|
"malformed-response");
|
|
error.response = response;
|
|
cb(error, null);
|
|
return;
|
|
}
|
|
|
|
let result;
|
|
try {
|
|
result = JSON.parse(response.body);
|
|
} catch (ex) {
|
|
this._log.warn("Invalid JSON returned by server: " + response.body);
|
|
let error = new TokenServerClientServerError("Malformed JSON.",
|
|
"malformed-response");
|
|
error.response = response;
|
|
cb(error, null);
|
|
return;
|
|
}
|
|
|
|
// Any response status can have X-Backoff or X-Weave-Backoff headers.
|
|
this._maybeNotifyBackoff(response, "x-weave-backoff");
|
|
this._maybeNotifyBackoff(response, "x-backoff");
|
|
|
|
// The service shouldn't have any 3xx, so we don't need to handle those.
|
|
if (response.status != 200) {
|
|
// We /should/ have a Cornice error report in the JSON. We log that to
|
|
// help with debugging.
|
|
if ("errors" in result) {
|
|
// This could throw, but this entire function is wrapped in a try. If
|
|
// the server is sending something not an array of objects, it has
|
|
// failed to keep its contract with us and there is little we can do.
|
|
for (let error of result.errors) {
|
|
this._log.info("Server-reported error: " + JSON.stringify(error));
|
|
}
|
|
}
|
|
|
|
let error = new TokenServerClientServerError();
|
|
error.response = response;
|
|
|
|
if (response.status == 400) {
|
|
error.message = "Malformed request.";
|
|
error.cause = "malformed-request";
|
|
} else if (response.status == 401) {
|
|
// Cause can be invalid-credentials, invalid-timestamp, or
|
|
// invalid-generation.
|
|
error.message = "Authentication failed.";
|
|
error.cause = result.status;
|
|
}
|
|
|
|
// 403 should represent a "condition acceptance needed" response.
|
|
//
|
|
// The extra validation of "urls" is important. We don't want to signal
|
|
// conditions required unless we are absolutely sure that is what the
|
|
// server is asking for.
|
|
else if (response.status == 403) {
|
|
if (!("urls" in result)) {
|
|
this._log.warn("403 response without proper fields!");
|
|
this._log.warn("Response body: " + response.body);
|
|
|
|
error.message = "Missing JSON fields.";
|
|
error.cause = "malformed-response";
|
|
} else if (typeof(result.urls) != "object") {
|
|
error.message = "urls field is not a map.";
|
|
error.cause = "malformed-response";
|
|
} else {
|
|
error.message = "Conditions must be accepted.";
|
|
error.cause = "conditions-required";
|
|
error.urls = result.urls;
|
|
}
|
|
} else if (response.status == 404) {
|
|
error.message = "Unknown service.";
|
|
error.cause = "unknown-service";
|
|
}
|
|
|
|
// A Retry-After header should theoretically only appear on a 503, but
|
|
// we'll look for it on any error response.
|
|
this._maybeNotifyBackoff(response, "retry-after");
|
|
|
|
cb(error, null);
|
|
return;
|
|
}
|
|
|
|
for (let k of ["id", "key", "api_endpoint", "uid", "duration"]) {
|
|
if (!(k in result)) {
|
|
let error = new TokenServerClientServerError("Expected key not " +
|
|
" present in result: " +
|
|
k);
|
|
error.cause = "malformed-response";
|
|
error.response = response;
|
|
cb(error, null);
|
|
return;
|
|
}
|
|
}
|
|
|
|
this._log.debug("Successful token response");
|
|
cb(null, {
|
|
id: result.id,
|
|
key: result.key,
|
|
endpoint: result.api_endpoint,
|
|
uid: result.uid,
|
|
duration: result.duration,
|
|
});
|
|
},
|
|
|
|
/*
|
|
* The prefix used for all notifications sent by this module. This
|
|
* allows the handler of notifications to be sure they are handling
|
|
* notifications for the service they expect.
|
|
*
|
|
* If not set, no notifications will be sent.
|
|
*/
|
|
observerPrefix: null,
|
|
|
|
// Given an optional header value, notify that a backoff has been requested.
|
|
_maybeNotifyBackoff: function (response, headerName) {
|
|
if (!this.observerPrefix) {
|
|
return;
|
|
}
|
|
let headerVal = response.headers[headerName];
|
|
if (!headerVal) {
|
|
return;
|
|
}
|
|
let backoffInterval;
|
|
try {
|
|
backoffInterval = parseInt(headerVal, 10);
|
|
} catch (ex) {
|
|
this._log.error("TokenServer response had invalid backoff value in '" +
|
|
headerName + "' header: " + headerVal);
|
|
return;
|
|
}
|
|
Observers.notify(this.observerPrefix + ":backoff:interval", backoffInterval);
|
|
},
|
|
|
|
// override points for testing.
|
|
newRESTRequest: function(url) {
|
|
return new RESTRequest(url);
|
|
}
|
|
};
|