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/* 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 = ["ChromeManifestParser"];
const Cc = Components.classes;
const Ci = Components.interfaces;
const Cr = Components.results;
const Cu = Components.utils;
Cu.import("resource://gre/modules/Services.jsm");
Cu.import("resource://gre/modules/NetUtil.jsm");
const MSG_JAR_FLUSH = "AddonJarFlush";
/**
* Sends local and remote notifications to flush a JAR file cache entry
*
* @param aJarFile
* The ZIP/XPI/JAR file as a nsIFile
*/
function flushJarCache(aJarFile) {
Services.obs.notifyObservers(aJarFile, "flush-cache-entry", null);
Cc["@mozilla.org/globalmessagemanager;1"].getService(Ci.nsIMessageBroadcaster)
.broadcastAsyncMessage(MSG_JAR_FLUSH, aJarFile.path);
}
/**
* Parses chrome manifest files.
*/
this.ChromeManifestParser = {
/**
* Reads and parses a chrome manifest file located at a specified URI, and all
* secondary manifests it references.
*
* @param aURI
* A nsIURI pointing to a chrome manifest.
* Typically a file: or jar: URI.
* @return Array of objects describing each manifest instruction, in the form:
* { type: instruction-type, baseURI: string-uri, args: [arguments] }
**/
parseSync: function(aURI) {
function parseLine(aLine) {
let line = aLine.trim();
if (line.length == 0 || line.charAt(0) == '#')
return;
let tokens = line.split(/\s+/);
let type = tokens.shift();
if (type == "manifest") {
let uri = NetUtil.newURI(tokens.shift(), null, aURI);
data = data.concat(this.parseSync(uri));
} else {
data.push({type: type, baseURI: baseURI, args: tokens});
}
}
let contents = "";
try {
if (aURI.scheme == "jar")
contents = this._readFromJar(aURI);
else
contents = this._readFromFile(aURI);
} catch (e) {
// Silently fail.
}
if (!contents)
return [];
let baseURI = NetUtil.newURI(".", null, aURI).spec;
let data = [];
let lines = contents.split("\n");
lines.forEach(parseLine.bind(this));
return data;
},
_readFromJar: function(aURI) {
let data = "";
let entries = [];
let readers = [];
try {
// Deconstrict URI, which can be nested jar: URIs.
let uri = aURI.clone();
while (uri instanceof Ci.nsIJARURI) {
entries.push(uri.JAREntry);
uri = uri.JARFile;
}
// Open the base jar.
let reader = Cc["@mozilla.org/libjar/zip-reader;1"].
createInstance(Ci.nsIZipReader);
reader.open(uri.QueryInterface(Ci.nsIFileURL).file);
readers.push(reader);
// Open the nested jars.
for (let i = entries.length - 1; i > 0; i--) {
let innerReader = Cc["@mozilla.org/libjar/zip-reader;1"].
createInstance(Ci.nsIZipReader);
innerReader.openInner(reader, entries[i]);
readers.push(innerReader);
reader = innerReader;
}
// First entry is the actual file we want to read.
let zis = reader.getInputStream(entries[0]);
data = NetUtil.readInputStreamToString(zis, zis.available());
}
finally {
// Close readers in reverse order.
for (let i = readers.length - 1; i >= 0; i--) {
readers[i].close();
flushJarCache(readers[i].file);
}
}
return data;
},
_readFromFile: function(aURI) {
let file = aURI.QueryInterface(Ci.nsIFileURL).file;
if (!file.exists() || !file.isFile())
return "";
let data = "";
let fis = Cc["@mozilla.org/network/file-input-stream;1"].
createInstance(Ci.nsIFileInputStream);
try {
fis.init(file, -1, -1, false);
data = NetUtil.readInputStreamToString(fis, fis.available());
} finally {
fis.close();
}
return data;
},
/**
* Detects if there were any instructions of a specified type in a given
* chrome manifest.
*
* @param aManifest
* Manifest data, as returned by ChromeManifestParser.parseSync().
* @param aType
* Instruction type to filter by.
* @return True if any matching instructions were found in the manifest.
*/
hasType: function(aManifest, aType) {
return aManifest.some(entry => entry.type == aType);
}
};
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