gecko-dev/dom/manifest/ManifestProcessor.jsm

268 строки
8.4 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});
*
* Depends on ImageObjectProcessor to process things like
* icons and splash_screens.
*
* 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 console. (1086997).
*/
/* globals Components, ValueExtractor, ImageObjectProcessor, ConsoleAPI*/
"use strict";
const {XPCOMUtils} = ChromeUtils.import("resource://gre/modules/XPCOMUtils.jsm");
XPCOMUtils.defineLazyGlobalGetters(this, ["URL"]);
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",
]);
const textDirections = new Set(["ltr", "rtl", "auto"]);
const {ConsoleAPI} = ChromeUtils.import("resource://gre/modules/Console.jsm");
const {Services} = ChromeUtils.import("resource://gre/modules/Services.jsm");
// ValueExtractor is used by the various processors to get values
// from the manifest and to report errors.
const {ValueExtractor} = ChromeUtils.import("resource://gre/modules/ValueExtractor.jsm");
// ImageObjectProcessor is used to process things like icons and images
const {ImageObjectProcessor} = ChromeUtils.import("resource://gre/modules/ImageObjectProcessor.jsm");
const domBundle = Services.strings.createBundle("chrome://global/locale/dom/dom.properties");
var ManifestProcessor = { // jshint ignore:line
get defaultDisplayMode() {
return "browser";
},
get displayModes() {
return displayModes;
},
get orientationTypes() {
return orientationTypes;
},
get textDirections() {
return textDirections;
},
// process() method processes JSON text into a clean manifest
// that conforms with the W3C specification. Takes an object
// expecting the following dictionary items:
// * jsonText: the JSON string to be processed.
// * manifestURL: the URL of the manifest, to resolve URLs.
// * docURL: the URL of the owner doc, for security checks
process(aOptions) {
const {
jsonText,
manifestURL: aManifestURL,
docURL: aDocURL,
} = aOptions;
const console = new ConsoleAPI({
prefix: "Web Manifest",
});
let rawManifest = {};
try {
rawManifest = JSON.parse(jsonText);
} catch (e) {}
if (rawManifest === null) {
return null;
}
if (typeof rawManifest !== "object") {
console.warn(domBundle.GetStringFromName("ManifestShouldBeObject"));
rawManifest = {};
}
const manifestURL = new URL(aManifestURL);
const docURL = new URL(aDocURL);
const extractor = new ValueExtractor(console, domBundle);
const imgObjProcessor = new ImageObjectProcessor(console, extractor);
const processedManifest = {
"dir": processDirMember.call(this),
"lang": processLangMember(),
"start_url": processStartURLMember(),
"display": processDisplayMember.call(this),
"orientation": processOrientationMember.call(this),
"name": processNameMember(),
"icons": imgObjProcessor.process(
rawManifest, manifestURL, "icons"
),
"short_name": processShortNameMember(),
"theme_color": processThemeColorMember(),
"background_color": processBackgroundColorMember(),
};
processedManifest.scope = processScopeMember();
return processedManifest;
function processDirMember() {
const spec = {
objectName: "manifest",
object: rawManifest,
property: "dir",
expectedType: "string",
trim: true,
};
const value = extractor.extractValue(spec);
if (this.textDirections.has(value)) {
return value;
}
return "auto";
}
function processNameMember() {
const spec = {
objectName: "manifest",
object: rawManifest,
property: "name",
expectedType: "string",
trim: true,
};
return extractor.extractValue(spec);
}
function processShortNameMember() {
const spec = {
objectName: "manifest",
object: rawManifest,
property: "short_name",
expectedType: "string",
trim: true,
};
return extractor.extractValue(spec);
}
function processOrientationMember() {
const spec = {
objectName: "manifest",
object: rawManifest,
property: "orientation",
expectedType: "string",
trim: true,
};
const value = extractor.extractValue(spec);
if (value && typeof value === "string" && this.orientationTypes.has(value.toLowerCase())) {
return value.toLowerCase();
}
return undefined;
}
function processDisplayMember() {
const spec = {
objectName: "manifest",
object: rawManifest,
property: "display",
expectedType: "string",
trim: true,
};
const value = extractor.extractValue(spec);
if (value && typeof value === "string" && displayModes.has(value.toLowerCase())) {
return value.toLowerCase();
}
return this.defaultDisplayMode;
}
function processScopeMember() {
const spec = {
objectName: "manifest",
object: rawManifest,
property: "scope",
expectedType: "string",
trim: false,
};
let scopeURL;
const startURL = new URL(processedManifest.start_url);
const value = extractor.extractValue(spec);
if (value === undefined || value === "") {
return undefined;
}
try {
scopeURL = new URL(value, manifestURL);
} catch (e) {
console.warn(domBundle.GetStringFromName("ManifestScopeURLInvalid"));
return undefined;
}
if (scopeURL.origin !== docURL.origin) {
console.warn(domBundle.GetStringFromName("ManifestScopeNotSameOrigin"));
return undefined;
}
// If start URL is not within scope of scope URL:
let isSameOrigin = startURL && startURL.origin !== scopeURL.origin;
if (isSameOrigin || !startURL.pathname.startsWith(scopeURL.pathname)) {
console.warn(domBundle.GetStringFromName("ManifestStartURLOutsideScope"));
return undefined;
}
return scopeURL.href;
}
function processStartURLMember() {
const spec = {
objectName: "manifest",
object: rawManifest,
property: "start_url",
expectedType: "string",
trim: false,
};
let result = new URL(docURL).href;
const value = extractor.extractValue(spec);
if (value === undefined || value === "") {
return result;
}
let potentialResult;
try {
potentialResult = new URL(value, manifestURL);
} catch (e) {
console.warn(domBundle.GetStringFromName("ManifestStartURLInvalid"));
return result;
}
if (potentialResult.origin !== docURL.origin) {
console.warn(domBundle.GetStringFromName("ManifestStartURLShouldBeSameOrigin"));
} else {
result = potentialResult.href;
}
return result;
}
function processThemeColorMember() {
const spec = {
objectName: "manifest",
object: rawManifest,
property: "theme_color",
expectedType: "string",
trim: true,
};
return extractor.extractColorValue(spec);
}
function processBackgroundColorMember() {
const spec = {
objectName: "manifest",
object: rawManifest,
property: "background_color",
expectedType: "string",
trim: true,
};
return extractor.extractColorValue(spec);
}
function processLangMember() {
const spec = {
objectName: "manifest",
object: rawManifest,
property: "lang",
expectedType: "string", trim: true,
};
return extractor.extractLanguageValue(spec);
}
},
};
var EXPORTED_SYMBOLS = ["ManifestProcessor"]; // jshint ignore:line