138 lines
3.3 KiB
JavaScript
138 lines
3.3 KiB
JavaScript
let timeout;
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const loadingQueue = [];
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const localCache = {};
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const failedCache = {};
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function resolveSize(img) {
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$(img).addClass("size-resolved");
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if (img.width > 0 && img.width === img.height) {
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$(img).addClass("onebox-avatar");
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}
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}
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// Detect square images and apply smaller onebox-avatar class
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function applySquareGenericOnebox($elem, normalizedUrl) {
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if (!$elem.hasClass("whitelistedgeneric")) {
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return;
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}
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let $img = $elem.find(".onebox-body img.thumbnail");
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let img = $img[0];
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// already resolved... skip
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if ($img.length !== 1 || $img.hasClass("size-resolved")) {
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return;
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}
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if (img.complete) {
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resolveSize(img, $elem, normalizedUrl);
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} else {
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$img.on("load.onebox", () => {
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resolveSize(img, $elem, normalizedUrl);
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$img.off("load.onebox");
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});
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}
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}
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function loadNext(ajax) {
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if (loadingQueue.length === 0) {
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timeout = null;
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return;
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}
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let timeoutMs = 150;
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let removeLoading = true;
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const { url, refresh, $elem, categoryId, topicId } = loadingQueue.shift();
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// Retrieve the onebox
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return ajax("/onebox", {
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dataType: "html",
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data: {
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url,
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refresh,
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category_id: categoryId,
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topic_id: topicId
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},
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cache: true
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})
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.then(
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html => {
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let $html = $(html);
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localCache[normalize(url)] = $html;
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$elem.replaceWith($html);
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applySquareGenericOnebox($html, normalize(url));
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},
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result => {
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if (result && result.jqXHR && result.jqXHR.status === 429) {
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timeoutMs = 2000;
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removeLoading = false;
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loadingQueue.unshift({ url, refresh, $elem, categoryId, topicId });
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} else {
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failedCache[normalize(url)] = true;
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}
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}
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)
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.finally(() => {
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timeout = Ember.run.later(() => loadNext(ajax), timeoutMs);
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if (removeLoading) {
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$elem.removeClass("loading-onebox");
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$elem.data("onebox-loaded");
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}
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});
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}
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// Perform a lookup of a onebox based an anchor $element.
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// It will insert a loading indicator and remove it when the loading is complete or fails.
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export function load({
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elem,
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refresh = true,
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ajax,
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synchronous = false,
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categoryId,
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topicId
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}) {
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const $elem = $(elem);
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// If the onebox has loaded or is loading, return
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if ($elem.data("onebox-loaded")) return;
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if ($elem.hasClass("loading-onebox")) return;
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const url = elem.href;
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// Unless we're forcing a refresh...
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if (!refresh) {
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// If we have it in our cache, return it.
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const cached = localCache[normalize(url)];
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if (cached) return cached.prop("outerHTML");
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// If the request failed, don't do anything
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const failed = failedCache[normalize(url)];
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if (failed) return;
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}
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// Add the loading CSS class
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$elem.addClass("loading-onebox");
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// Add to the loading queue
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loadingQueue.push({ url, refresh, $elem, categoryId, topicId });
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// Load next url in queue
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if (synchronous) {
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return loadNext(ajax);
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} else {
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timeout = timeout || Ember.run.later(() => loadNext(ajax), 150);
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}
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}
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// Sometimes jQuery will return URLs with trailing slashes when the
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// `href` didn't have them.
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function normalize(url) {
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return url.replace(/\/$/, "");
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}
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export function lookupCache(url) {
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const cached = localCache[normalize(url)];
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return cached && cached.prop("outerHTML");
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}
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