tildefriends/packages/cory/libunfurl/libunfurl.js

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"use strict";
//! {"category": "libraries", "require": ["libencoding", "libhttp", "libxml"], "permissions": ["network"]}
let libxml = require("libxml");
let libhttp = require("libhttp");
let gEmbedIndex = 0;
let gCache = {};
async function unfurl(url) {
let result = {href: url};
let response = await libhttp.get(url);
let parsed = libxml.StreamParser().parse(response.body);
let oEmbedUrl;
for (let node of parsed) {
if (node.type == "element" && node.value == "link" && node.attributes.type == "application/json+oembed") {
oEmbedUrl = node.attributes.href;
break;
}
}
if (oEmbedUrl) {
response = await libhttp.get(oEmbedUrl);
let oEmbed = JSON.parse(response.body);
gEmbedIndex++;
result = [{href: url}, "\n", {
name: "oEmbed" + gEmbedIndex,
iframe: `
<style type="text/css">border: 0; padding: 0; margin: 0; overflow: hidden</style>
${oEmbed.html}<script language="javascript">
let gResizeMeMessage = {
event: "resizeMe",
name: "oEmbed${gEmbedIndex}",
width: -1,
height: -1,
};
setInterval(function() {
if (document.body.scrollHeight != gResizeMeMessage.height
|| document.body.scrollWidth != gResizeMeMessage.width) {
gResizeMeMessage.width = document.body.scrollWidth;
gResizeMeMessage.height = document.body.scrollHeight;
parent.postMessage(gResizeMeMessage, "*");
}
}, 100);
</script>`,
width: oEmbed.width || 320,
height: oEmbed.height || 120,
style: "margin: 0; padding: 0; border: 0; overflow: hidden",
}];
}
return result;
}
async function test() {
terminal.print(await unfurl("https://twitter.com/511nyAlbany/status/777221230915096576"));
terminal.print(await unfurl("https://www.youtube.com/watch?v=pTA0DSfrGZ0"));
}
//test().catch(terminal.print);
core.register("onMessage", async function(sender, message) {
let result = message;
if (gCache[message] && new Date().valueOf() < gCache[message].expires) {
result = gCache[message].result;
} else {
try {
result = await unfurl(message);
} catch (error) {
result = [{href: message}, " (error retrieving: ", error, ")"];
}
gCache[message] = {
expires: new Date().valueOf() + 7 * 24 * 60 * 60 * 1000,
result: result,
};
}
return result;
});