--- /dev/null
+/**
+ * (c) 2010 StatusNet, Inc.
+ */
+
+(function() {
+ /**
+ * Quickie wrapper around ooembed JSON lookup
+ */
+ var oEmbed = {
+ api: 'https://noembed.com/embed',
+ width: 100,
+ height: 75,
+ cache: {},
+ callbacks: {},
+
+ /**
+ * Do a cached oEmbed lookup for the given URL.
+ *
+ * @param {String} url
+ * @param {function} callback
+ */
+ lookup: function(url, callback)
+ {
+ if (typeof oEmbed.cache[url] == "object") {
+ // We already have a successful lookup.
+ callback(oEmbed.cache[url]);
+ } else if (typeof oEmbed.callbacks[url] == "undefined") {
+ // No lookup yet... Start it!
+ oEmbed.callbacks[url] = [callback];
+
+ oEmbed.rawLookup(url, function(data) {
+ oEmbed.cache[url] = data;
+ var callbacks = oEmbed.callbacks[url];
+ oEmbed.callbacks[url] = undefined;
+ for (var i = 0; i < callbacks.length; i++) {
+ callbacks[i](data);
+ }
+ });
+ } else {
+ // A lookup is in progress.
+ oEmbed.callbacks[url].push(callback);
+ }
+ },
+
+ /**
+ * Do an oEmbed lookup for the given URL.
+ *
+ * @fixme proxy through ourselves if possible?
+ * @fixme use the global thumbnail size settings
+ *
+ * @param {String} url
+ * @param {function} callback
+ */
+ rawLookup: function(url, callback)
+ {
+ var params = {
+ url: url,
+ format: 'json',
+ maxwidth: oEmbed.width,
+ maxheight: oEmbed.height,
+ token: $('#token').val()
+ };
+ $.ajax({
+ url: oEmbed.api,
+ data: params,
+ dataType: 'json',
+ success: function(data, xhr) {
+ callback(data);
+ },
+ error: function(xhr, textStatus, errorThrown) {
+ callback(null);
+ }
+ });
+ }
+ };
+
+ SN.Init.LinkPreview = function(params) {
+ if (params.api) oEmbed.api = params.api;
+ if (params.width) oEmbed.width = params.width;
+ if (params.height) oEmbed.height = params.height;
+ }
+
+ // Piggyback on the counter update...
+ var origCounter = SN.U.Counter;
+ SN.U.Counter = function(form) {
+ var preview = form.data('LinkPreview');
+ if (preview) {
+ preview.previewLinks(form.find('.notice_data-text:first').val());
+ }
+ return origCounter(form);
+ }
+
+ // Customize notice form init...
+ var origSetup = SN.Init.NoticeFormSetup;
+ SN.Init.NoticeFormSetup = function(form) {
+ origSetup(form);
+
+ form
+ .bind('reset', function() {
+ LinkPreview.clear();
+ });
+
+ var LinkPreview = {
+ links: [],
+ state: [],
+ refresh: [],
+
+ /**
+ * Find URL links from the source text that may be interesting.
+ *
+ * @param {String} text
+ * @return {Array} list of URLs
+ */
+ findLinks: function (text)
+ {
+ // @fixme match this to core code
+ var re = /(?:^| )(https?:\/\/.+?\/.+?)(?= |$)/mg;
+ var links = [];
+ var matches;
+ while ((matches = re.exec(text)) !== null) {
+ links.push(matches[1]);
+ }
+ return links;
+ },
+
+ ensureArea: function() {
+ if (form.find('.link-preview').length < 1) {
+ form.append('<div class="notice-status link-preview thumbnails"></div>');
+ }
+ },
+
+ /**
+ * Start looking up info for a link preview...
+ * May start async data loads.
+ *
+ * @param {number} col: column number to insert preview into
+ */
+ prepLinkPreview: function(col)
+ {
+ var id = 'link-preview-' + col;
+ var url = LinkPreview.links[col];
+ LinkPreview.refresh[col] = false;
+ LinkPreview.markLoading(col);
+
+ oEmbed.lookup(url, function(data) {
+ var thumb = null;
+ var width = 100;
+ if (data && typeof data.thumbnail_url == "string") {
+ thumb = data.thumbnail_url;
+ if (typeof data.thumbnail_width !== "undefined") {
+ if (data.thumbnail_width < width) {
+ width = data.thumbnail_width;
+ }
+ }
+ } else if (data && data.type == 'photo' && typeof data.url == "string") {
+ thumb = data.url;
+ if (typeof data.width !== "undefined") {
+ if (data.width < width) {
+ width = data.width;
+ }
+ }
+ }
+
+ if (thumb) {
+ LinkPreview.ensureArea();
+ var link = $('<span class="inline-attachment"><a><img/></a></span>');
+ link.find('a')
+ .attr('href', url)
+ .attr('target', '_blank')
+ .last()
+ .find('img')
+ .attr('src', thumb)
+ .attr('width', width)
+ .attr('title', data.title || data.url || url);
+ form.find('.' + id)
+ .empty()
+ .append(link);
+ } else {
+ // No thumbnail available or error retriving it.
+ LinkPreview.clearLink(col);
+ }
+
+ if (LinkPreview.refresh[col]) {
+ // Darn user has typed more characters.
+ // Go fetch another link!
+ LinkPreview.prepLinkPreview(col);
+ } else {
+ LinkPreview.markDone(col);
+ }
+ });
+ },
+
+ /**
+ * Update the live preview section with links found in the given text.
+ * May start async data loads.
+ *
+ * @param {String} text: free-form input text
+ */
+ previewLinks: function(text)
+ {
+ var i;
+ var old = LinkPreview.links;
+ var links = LinkPreview.findLinks(text);
+ LinkPreview.links = links;
+
+ // Check for existing common elements...
+ for (i = 0; i < old.length && i < links.length; i++) {
+ if (links[i] != old[i]) {
+ if (LinkPreview.state[i] == "loading") {
+ // Slate this column for a refresh when this one's done.
+ LinkPreview.refresh[i] = true;
+ } else {
+ // Change an existing entry!
+ LinkPreview.prepLinkPreview(i);
+ }
+ }
+ }
+ if (links.length > old.length) {
+ // Adding new entries, whee!
+ for (i = old.length; i < links.length; i++) {
+ LinkPreview.addPreviewArea(i);
+ LinkPreview.prepLinkPreview(i);
+ }
+ } else if (old.length > links.length) {
+ // Remove preview entries for links that have been removed.
+ for (i = links.length; i < old.length; i++) {
+ LinkPreview.clearLink(i);
+ }
+ }
+ if (links.length == 0) {
+ LinkPreview.clear();
+ }
+ },
+
+ addPreviewArea: function(col) {
+ LinkPreview.ensureArea();
+ var id = 'link-preview-' + col;
+ if (form.find('.' + id).length < 1) {
+ form.find('.link-preview').append('<span class="' + id + '"></span>');
+ }
+ },
+
+ clearLink: function(col) {
+ var id = 'link-preview-' + col;
+ form.find('.' + id).html('');
+ },
+
+ markLoading: function(col) {
+ LinkPreview.state[col] = "loading";
+ var id = 'link-preview-' + col;
+ form.find('.' + id).attr('style', 'opacity: 0.5');
+ },
+
+ markDone: function(col) {
+ LinkPreview.state[col] = "done";
+ var id = 'link-preview-' + col;
+ form.find('.' + id).removeAttr('style');
+ },
+
+ /**
+ * Clear out any link preview data.
+ */
+ clear: function() {
+ LinkPreview.links = [];
+ form.find('.link-preview').remove();
+ }
+ };
+ form.data('LinkPreview', LinkPreview);
+ }
+})();
projects / quix0rs-gnu-social.git / blobdiff