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Diffstat (limited to 'toolkit/components/downloads/Downloads.jsm')
| -rw-r--r-- | toolkit/components/downloads/Downloads.jsm | 303 |
1 files changed, 303 insertions, 0 deletions
diff --git a/toolkit/components/downloads/Downloads.jsm b/toolkit/components/downloads/Downloads.jsm new file mode 100644 index 0000000000..dd0274044e --- /dev/null +++ b/toolkit/components/downloads/Downloads.jsm @@ -0,0 +1,303 @@ +/* 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/. */ + +/** + * Main entry point to get references to all the back-end objects. + */ + +"use strict"; + +var EXPORTED_SYMBOLS = ["Downloads"]; + +const { Integration } = ChromeUtils.import( + "resource://gre/modules/Integration.jsm" +); +const { Download, DownloadError } = ChromeUtils.import( + "resource://gre/modules/DownloadCore.jsm" +); + +ChromeUtils.defineModuleGetter( + this, + "DownloadCombinedList", + "resource://gre/modules/DownloadList.jsm" +); +ChromeUtils.defineModuleGetter( + this, + "DownloadList", + "resource://gre/modules/DownloadList.jsm" +); +ChromeUtils.defineModuleGetter( + this, + "DownloadSummary", + "resource://gre/modules/DownloadList.jsm" +); + +/* global DownloadIntegration */ +Integration.downloads.defineModuleGetter( + this, + "DownloadIntegration", + "resource://gre/modules/DownloadIntegration.jsm" +); + +/** + * This object is exposed directly to the consumers of this JavaScript module, + * and provides the only entry point to get references to back-end objects. + */ +var Downloads = { + /** + * Work on downloads that were not started from a private browsing window. + */ + get PUBLIC() { + return "{Downloads.PUBLIC}"; + }, + /** + * Work on downloads that were started from a private browsing window. + */ + get PRIVATE() { + return "{Downloads.PRIVATE}"; + }, + /** + * Work on both Downloads.PRIVATE and Downloads.PUBLIC downloads. + */ + get ALL() { + return "{Downloads.ALL}"; + }, + + /** + * Creates a new Download object. + * + * @param aProperties + * Provides the initial properties for the newly created download. + * This matches the serializable representation of a Download object. + * Some of the most common properties in this object include: + * { + * source: String containing the URI for the download source. + * Alternatively, may be an nsIURI, a DownloadSource object, + * or an object with the following properties: + * { + * url: String containing the URI for the download source. + * isPrivate: Indicates whether the download originated from a + * private window. If omitted, the download is public. + * referrerInfo: String or nsIReferrerInfo object represents the + * referrerInfo of the download source. Can be + * omitted or null for example when the download + * source is not HTTP. + * }, + * target: String containing the path of the target file. + * Alternatively, may be an nsIFile, a DownloadTarget object, + * or an object with the following properties: + * { + * path: String containing the path of the target file. + * }, + * saver: String representing the class of the download operation. + * If omitted, defaults to "copy". Alternatively, may be the + * serializable representation of a DownloadSaver object. + * } + * + * @return {Promise} + * @resolves The newly created Download object. + * @rejects JavaScript exception. + */ + createDownload: function D_createDownload(aProperties) { + try { + return Promise.resolve(Download.fromSerializable(aProperties)); + } catch (ex) { + return Promise.reject(ex); + } + }, + + /** + * Downloads data from a remote network location to a local file. + * + * This download method does not provide user interface, or the ability to + * cancel or restart the download programmatically. For that, you should + * obtain a reference to a Download object using the createDownload function. + * + * Since the download cannot be restarted, any partially downloaded data will + * not be kept in case the download fails. + * + * @param aSource + * String containing the URI for the download source. Alternatively, + * may be an nsIURI or a DownloadSource object. + * @param aTarget + * String containing the path of the target file. Alternatively, may + * be an nsIFile or a DownloadTarget object. + * @param aOptions + * An optional object used to control the behavior of this function. + * You may pass an object with a subset of the following fields: + * { + * isPrivate: Indicates whether the download originated from a + * private window. + * } + * + * @return {Promise} + * @resolves When the download has finished successfully. + * @rejects JavaScript exception if the download failed. + */ + fetch(aSource, aTarget, aOptions) { + return this.createDownload({ + source: aSource, + target: aTarget, + }).then(function D_SD_onSuccess(aDownload) { + if (aOptions && "isPrivate" in aOptions) { + aDownload.source.isPrivate = aOptions.isPrivate; + } + return aDownload.start(); + }); + }, + + /** + * Retrieves the specified type of DownloadList object. There is one download + * list for each type, and this method always retrieves a reference to the + * same download list when called with the same argument. + * + * Calling this function may cause the list of public downloads to be reloaded + * from the previous session, if it wasn't loaded already. + * + * @param aType + * This can be Downloads.PUBLIC, Downloads.PRIVATE, or Downloads.ALL. + * Downloads added to the Downloads.PUBLIC and Downloads.PRIVATE lists + * are reflected in the Downloads.ALL list, and downloads added to the + * Downloads.ALL list are also added to either the Downloads.PUBLIC or + * the Downloads.PRIVATE list based on their properties. + * + * @return {Promise} + * @resolves The requested DownloadList or DownloadCombinedList object. + * @rejects JavaScript exception. + */ + getList(aType) { + if (!this._promiseListsInitialized) { + this._promiseListsInitialized = (async () => { + let publicList = new DownloadList(); + let privateList = new DownloadList(); + let combinedList = new DownloadCombinedList(publicList, privateList); + + try { + await DownloadIntegration.addListObservers(publicList, false); + await DownloadIntegration.addListObservers(privateList, true); + await DownloadIntegration.initializePublicDownloadList(publicList); + } catch (ex) { + Cu.reportError(ex); + } + + let publicSummary = await this.getSummary(Downloads.PUBLIC); + let privateSummary = await this.getSummary(Downloads.PRIVATE); + let combinedSummary = await this.getSummary(Downloads.ALL); + + await publicSummary.bindToList(publicList); + await privateSummary.bindToList(privateList); + await combinedSummary.bindToList(combinedList); + + this._lists[Downloads.PUBLIC] = publicList; + this._lists[Downloads.PRIVATE] = privateList; + this._lists[Downloads.ALL] = combinedList; + })(); + } + + return this._promiseListsInitialized.then(() => this._lists[aType]); + }, + + /** + * Promise resolved when the initialization of the download lists has + * completed, or null if initialization has never been requested. + */ + _promiseListsInitialized: null, + + /** + * After initialization, this object is populated with one key for each type + * of download list that can be returned (Downloads.PUBLIC, Downloads.PRIVATE, + * or Downloads.ALL). The values are the DownloadList objects. + */ + _lists: {}, + + /** + * Retrieves the specified type of DownloadSummary object. There is one + * download summary for each type, and this method always retrieves a + * reference to the same download summary when called with the same argument. + * + * Calling this function does not cause the list of public downloads to be + * reloaded from the previous session. The summary will behave as if no + * downloads are present until the getList method is called. + * + * @param aType + * This can be Downloads.PUBLIC, Downloads.PRIVATE, or Downloads.ALL. + * + * @return {Promise} + * @resolves The requested DownloadList or DownloadCombinedList object. + * @rejects JavaScript exception. + */ + getSummary(aType) { + if ( + aType != Downloads.PUBLIC && + aType != Downloads.PRIVATE && + aType != Downloads.ALL + ) { + throw new Error("Invalid aType argument."); + } + + if (!(aType in this._summaries)) { + this._summaries[aType] = new DownloadSummary(); + } + + return Promise.resolve(this._summaries[aType]); + }, + + /** + * This object is populated by the getSummary method with one key for each + * type of object that can be returned (Downloads.PUBLIC, Downloads.PRIVATE, + * or Downloads.ALL). The values are the DownloadSummary objects. + */ + _summaries: {}, + + /** + * Returns the system downloads directory asynchronously. + * Mac OSX: + * User downloads directory + * XP/2K: + * My Documents/Downloads + * Vista and others: + * User downloads directory + * Linux: + * XDG user dir spec, with a fallback to Home/Downloads + * Android: + * standard downloads directory i.e. /sdcard + * + * @return {Promise} + * @resolves The downloads directory string path. + */ + getSystemDownloadsDirectory: function D_getSystemDownloadsDirectory() { + return DownloadIntegration.getSystemDownloadsDirectory(); + }, + + /** + * Returns the preferred downloads directory based on the user preferences + * in the current profile asynchronously. + * + * @return {Promise} + * @resolves The downloads directory string path. + */ + getPreferredDownloadsDirectory: function D_getPreferredDownloadsDirectory() { + return DownloadIntegration.getPreferredDownloadsDirectory(); + }, + + /** + * Returns the temporary directory where downloads are placed before the + * final location is chosen, or while the document is opened temporarily + * with an external application. This may or may not be the system temporary + * directory, based on the platform asynchronously. + * + * @return {Promise} + * @resolves The downloads directory string path. + */ + getTemporaryDownloadsDirectory: function D_getTemporaryDownloadsDirectory() { + return DownloadIntegration.getTemporaryDownloadsDirectory(); + }, + + /** + * Constructor for a DownloadError object. When you catch an exception during + * a download, you can use this to verify if "ex instanceof Downloads.Error", + * before reading the exception properties with the error details. + */ + Error: DownloadError, +}; |