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