gecko-dev/dom/manifest/ManifestProcessor.jsm

323 строки
9.3 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/. */
/*
* ManifestProcessor
* Implementation of processing algorithms from:
* http://www.w3.org/2008/webapps/manifest/
*
* Creates manifest processor that lets you process a JSON file
* or individual parts of a manifest object. A manifest is just a
* standard JS object that has been cleaned up.
*
* .process(jsonText, manifestURL, docURL);
*
* TODO: The constructor should accept the UA's supported orientations.
* TODO: The constructor should accept the UA's supported display modes.
* TODO: hook up developer tools to issueDeveloperWarning (1086997).
*/
/*globals Components*/
/*exported EXPORTED_SYMBOLS */
'use strict';
this.EXPORTED_SYMBOLS = ['ManifestProcessor'];
const {
utils: Cu,
classes: Cc,
interfaces: Ci
} = Components;
const imports = {};
Cu.import('resource://gre/modules/Services.jsm', imports);
Cu.importGlobalProperties(['URL']);
const securityManager = imports.Services.scriptSecurityManager;
const netutil = Cc['@mozilla.org/network/util;1'].getService(Ci.nsINetUtil);
const defaultDisplayMode = 'browser';
const displayModes = new Set([
'fullscreen',
'standalone',
'minimal-ui',
'browser'
]);
const orientationTypes = new Set([
'any',
'natural',
'landscape',
'portrait',
'portrait-primary',
'portrait-secondary',
'landscape-primary',
'landscape-secondary'
]);
this.ManifestProcessor = function ManifestProcessor() {};
/**
* process method: processes json text into a clean manifest
* that conforms with the W3C specification.
* @param jsonText - the JSON string to be processd.
* @param manifestURL - the URL of the manifest, to resolve URLs.
* @param docURL - the URL of the owner doc, for security checks
*/
this.ManifestProcessor.prototype.process = function({
jsonText: jsonText,
manifestURL: manifestURL,
docLocation: docURL
}) {
/*
* This helper function is used to extract values from manifest members.
* It also reports conformance violations.
*/
function extractValue(obj) {
let value = obj.object[obj.property];
//we need to special-case "array", as it's not a JS primitive
const type = (Array.isArray(value)) ? 'array' : typeof value;
if (type !== obj.expectedType) {
if (type !== 'undefined') {
let msg = `Expected the ${obj.objectName}'s ${obj.property}`;
msg += `member to a be a ${obj.expectedType}.`;
issueDeveloperWarning(msg);
}
value = undefined;
}
return value;
}
function issueDeveloperWarning(msg) {
//https://bugzilla.mozilla.org/show_bug.cgi?id=1086997
}
function processNameMember(manifest) {
const obj = {
objectName: 'manifest',
object: manifest,
property: 'name',
expectedType: 'string'
};
let value = extractValue(obj);
return (value) ? value.trim() : value;
}
function processShortNameMember(manifest) {
const obj = {
objectName: 'manifest',
object: manifest,
property: 'short_name',
expectedType: 'string'
};
let value = extractValue(obj);
return (value) ? value.trim() : value;
}
function processOrientationMember(manifest) {
const obj = {
objectName: 'manifest',
object: manifest,
property: 'orientation',
expectedType: 'string'
};
let value = extractValue(obj);
value = (value) ? value.trim() : undefined;
//The spec special-cases orientation to return the empty string
return (orientationTypes.has(value)) ? value : '';
}
function processDisplayMember(manifest) {
const obj = {
objectName: 'manifest',
object: manifest,
property: 'display',
expectedType: 'string'
};
let value = extractValue(obj);
value = (value) ? value.trim() : value;
return (displayModes.has(value)) ? value : defaultDisplayMode;
}
function processStartURLMember(manifest, manifestURL, docURL) {
const obj = {
objectName: 'manifest',
object: manifest,
property: 'start_url',
expectedType: 'string'
};
let value = extractValue(obj),
result = new URL(docURL),
targetURI = makeURI(result),
sameOrigin = false,
potentialResult,
referrerURI;
if (value === undefined || value === '') {
return result;
}
try {
potentialResult = new URL(value, manifestURL);
} catch (e) {
issueDeveloperWarning('Invalid URL.');
return result;
}
referrerURI = makeURI(potentialResult);
try {
securityManager.checkSameOriginURI(referrerURI, targetURI, false);
sameOrigin = true;
} catch (e) {}
if (!sameOrigin) {
let msg = 'start_url must be same origin as document.';
issueDeveloperWarning(msg);
} else {
result = potentialResult;
}
return result;
//Converts a URL to a Gecko URI
function makeURI(webURL) {
return imports.Services.io.newURI(webURL.toString(), null, null);
}
}
//Constants used by IconsProcessor
const onlyDecimals = /^\d+$/,
anyRegEx = new RegExp('any', 'i');
function IconsProcessor() {}
IconsProcessor.prototype.processIcons = function(manifest, baseURL) {
const obj = {
objectName: 'manifest',
object: manifest,
property: 'icons',
expectedType: 'array'
},
icons = [];
let value = extractValue(obj);
if (Array.isArray(value)) {
//filter out icons with no "src" or src is empty string
let processableIcons = value.filter(
icon => icon && Object.prototype.hasOwnProperty.call(icon, 'src') && icon.src !== ''
);
for (let potentialIcon of processableIcons) {
let src = processSrcMember(potentialIcon, baseURL)
if(src !== undefined){
let icon = {
src: src,
type: processTypeMember(potentialIcon),
sizes: processSizesMember(potentialIcon),
density: processDensityMember(potentialIcon)
};
icons.push(icon);
}
}
}
return icons;
function processTypeMember(icon) {
const charset = {},
hadCharset = {},
obj = {
objectName: 'icon',
object: icon,
property: 'type',
expectedType: 'string'
};
let value = extractValue(obj),
isParsable = (typeof value === 'string' && value.length > 0);
value = (isParsable) ? netutil.parseContentType(value.trim(), charset, hadCharset) : undefined;
return (value === '') ? undefined : value;
}
function processDensityMember(icon) {
const hasDensity = Object.prototype.hasOwnProperty.call(icon, 'density'),
rawValue = (hasDensity) ? icon.density : undefined,
value = parseFloat(rawValue),
result = (Number.isNaN(value) || value === +Infinity || value <= 0) ? 1.0 : value;
return result;
}
function processSrcMember(icon, baseURL) {
const obj = {
objectName: 'icon',
object: icon,
property: 'src',
expectedType: 'string'
},
value = extractValue(obj);
let url;
if (typeof value === 'string' && value.trim() !== '') {
try {
url = new URL(value, baseURL);
} catch (e) {}
}
return url;
}
function processSizesMember(icon) {
const sizes = new Set(),
obj = {
objectName: 'icon',
object: icon,
property: 'sizes',
expectedType: 'string'
};
let value = extractValue(obj);
value = (value) ? value.trim() : value;
if (value) {
//split on whitespace and filter out invalid values
let validSizes = value.split(/\s+/).filter(isValidSizeValue);
validSizes.forEach((size) => sizes.add(size));
}
return sizes;
/*
* Implementation of HTML's link@size attribute checker
*/
function isValidSizeValue(size) {
if (anyRegEx.test(size)) {
return true;
}
size = size.toLowerCase();
if (!size.contains('x') || size.indexOf('x') !== size.lastIndexOf('x')) {
return false;
}
//split left of x for width, after x for height
const width = size.substring(0, size.indexOf('x'));
const height = size.substring(size.indexOf('x') + 1, size.length);
const isValid = !(height.startsWith('0') || width.startsWith('0') || !onlyDecimals.test(width + height));
return isValid;
}
}
};
function processIconsMember(manifest, manifestURL) {
const iconsProcessor = new IconsProcessor();
return iconsProcessor.processIcons(manifest, manifestURL);
}
//Processing starts here!
let manifest = {};
try {
manifest = JSON.parse(jsonText);
if (typeof manifest !== 'object' || manifest === null) {
let msg = 'Manifest needs to be an object.';
issueDeveloperWarning(msg);
manifest = {};
}
} catch (e) {
issueDeveloperWarning(e);
}
const processedManifest = {
start_url: processStartURLMember(manifest, manifestURL, docURL),
display: processDisplayMember(manifest),
orientation: processOrientationMember(manifest),
name: processNameMember(manifest),
icons: processIconsMember(manifest, manifestURL),
short_name: processShortNameMember(manifest)
};
return processedManifest;
};