discourse/app/assets/javascripts/pretty-text/upload-short-url.js.es6

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import { debounce } from "@ember/runloop";
import { ATTACHMENT_CSS_CLASS } from "./engines/discourse-markdown-it";
let _cache = {};
export function lookupCachedUploadUrl(shortUrl) {
return _cache[shortUrl] || {};
}
const MISSING = "missing";
export function lookupUncachedUploadUrls(urls, ajax) {
return ajax("/uploads/lookup-urls", {
method: "POST",
data: { short_urls: urls }
}).then(uploads => {
uploads.forEach(upload => {
cacheShortUploadUrl(upload.short_url, {
url: upload.url,
short_path: upload.short_path
});
});
urls.forEach(url =>
cacheShortUploadUrl(url, {
url: lookupCachedUploadUrl(url).url || MISSING,
short_path: lookupCachedUploadUrl(url).short_path || MISSING
})
);
return uploads;
});
}
export function cacheShortUploadUrl(shortUrl, value) {
_cache[shortUrl] = value;
}
export function resetCache() {
_cache = {};
}
function _loadCachedShortUrls($uploads) {
$uploads.each((idx, upload) => {
const $upload = $(upload);
let url;
switch (upload.tagName) {
case "A":
url = lookupCachedUploadUrl($upload.data("orig-href")).short_path;
if (url) {
$upload.removeAttr("data-orig-href");
if (url !== MISSING) {
$upload.attr("href", url);
const content = $upload.text().split("|");
if (content[1] === ATTACHMENT_CSS_CLASS) {
$upload.addClass(ATTACHMENT_CSS_CLASS);
$upload.text(content[0]);
}
}
}
break;
case "IMG":
url = lookupCachedUploadUrl($upload.data("orig-src")).url;
if (url) {
$upload.removeAttr("data-orig-src");
if (url !== MISSING) {
$upload.attr("src", url);
}
}
break;
}
});
}
function _loadShortUrls($uploads, ajax) {
const urls = $uploads.toArray().map(upload => {
const $upload = $(upload);
return $upload.data("orig-src") || $upload.data("orig-href");
});
return lookupUncachedUploadUrls(urls, ajax).then(() =>
_loadCachedShortUrls($uploads)
);
}
export function resolveAllShortUrls(ajax) {
const attributes = "img[data-orig-src], a[data-orig-href]";
let $shortUploadUrls = $(attributes);
if ($shortUploadUrls.length > 0) {
_loadCachedShortUrls($shortUploadUrls);
$shortUploadUrls = $(attributes);
if ($shortUploadUrls.length > 0) {
// this is carefully batched so we can do a leading debounce (trigger right away)
return debounce(
null,
() => _loadShortUrls($shortUploadUrls, ajax),
450,
true
);
}
}
}