1 files changed, 109 insertions, 0 deletions
diff --git a/resources/src/mediawiki.messagePoster/mediawiki.messagePoster.factory.js b/resources/src/mediawiki.messagePoster/mediawiki.messagePoster.factory.js
new file mode 100644
index 00000000..9d280800
--- /dev/null
+++ b/resources/src/mediawiki.messagePoster/mediawiki.messagePoster.factory.js
@@ -0,0 +1,109 @@
+/*global OO*/
+( function ( mw, $ ) {
+	/**
+	 * This is a factory for MessagePoster objects, which allows a pluggable to way to script leaving a
+	 * talk page message.
+	 *
+	 * @class mw.messagePoster.factory
+	 * @singleton
+	 */
+	function MwMessagePosterFactory() {
+		this.api = new mw.Api();
+		this.contentModelToClass = {};
+	}
+
+	OO.initClass( MwMessagePosterFactory );
+
+	// Note: This registration scheme is currently not compatible with LQT, since that doesn't
+	// have its own content model, just islqttalkpage.  LQT pages will be passed to the wikitext
+	// MessagePoster.
+	/**
+	 * Registers a MessagePoster subclass for a given content model.
+	 *
+	 * @param {string} contentModel Content model of pages this MessagePoster can post to
+	 * @param {Function} messagePosterConstructor Constructor for MessagePoster
+	 */
+	MwMessagePosterFactory.prototype.register = function ( contentModel, messagePosterConstructor ) {
+		if ( this.contentModelToClass[contentModel] !== undefined ) {
+			throw new Error( 'The content model \'' + contentModel + '\' is already registered.' );
+		}
+
+		this.contentModelToClass[contentModel] = messagePosterConstructor;
+	};
+
+	/**
+	 * Unregisters a given content model
+	 * This is exposed for testing and should not normally be needed.
+	 *
+	 * @param {string} contentModel Content model to unregister
+	 */
+	MwMessagePosterFactory.prototype.unregister = function ( contentModel ) {
+		delete this.contentModelToClass[contentModel];
+	};
+
+	/**
+	 * Creates a MessagePoster, given a title.  A promise for this is returned.
+	 * This works by determining the content model, then loading the corresponding
+	 * module (which will register the MessagePoster class), and finally constructing it.
+	 *
+	 * This does not require the message and should be called as soon as possible, so it does the
+	 * API and ResourceLoader requests in the background.
+	 *
+	 * @param {mw.Title} title Title that will be posted to
+	 * @return {jQuery.Promise} Promise resolving to a mw.messagePoster.MessagePoster.
+	 *   For failure, rejected with up to three arguments:
+	 *
+	 *   - errorCode Error code string
+	 *   - error Error explanation
+	 *   - details Further error details
+	 */
+	MwMessagePosterFactory.prototype.create = function ( title ) {
+		var pageId, page, contentModel, moduleName,
+			factory = this;
+
+		return this.api.get( {
+			action: 'query',
+			prop: 'info',
+			indexpageids: 1,
+			titles: title.getPrefixedDb()
+		} ).then( function ( result ) {
+			if ( result.query.pageids.length > 0 ) {
+				pageId = result.query.pageids[0];
+				page = result.query.pages[pageId];
+
+				contentModel = page.contentmodel;
+				moduleName = 'mediawiki.messagePoster.' + contentModel;
+				return mw.loader.using( moduleName ).then( function () {
+					return factory.createForContentModel(
+						contentModel,
+						title
+					);
+				}, function () {
+					return $.Deferred().reject( 'failed-to-load-module', 'Failed to load the \'' + moduleName + '\' module' );
+				} );
+			} else {
+				return $.Deferred().reject( 'unexpected-response', 'Unexpected API response' );
+			}
+		}, function ( errorCode, details ) {
+			return $.Deferred().reject( 'content-model-query-failed', errorCode, details );
+		} ).promise();
+	};
+
+	/**
+	 * Creates a MessagePoster instance, given a title and content model
+	 *
+	 * @private
+	 *
+	 * @param {string} contentModel Content model of title
+	 * @param {mw.Title} title Title being posted to
+	 * @return {mw.messagePoster.MessagePoster}
+	 *
+	 */
+	MwMessagePosterFactory.prototype.createForContentModel = function ( contentModel, title ) {
+		return new this.contentModelToClass[contentModel]( title );
+	};
+
+	mw.messagePoster = {
+		factory: new MwMessagePosterFactory()
+	};
+}( mediaWiki, jQuery ) );