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import { Config, Embed, EmbedType } from "@fosscord/util";
import fetch, { Response } from "node-fetch";
import * as cheerio from "cheerio";
import probe from "probe-image-size";
import imageSize from "image-size";
export const DEFAULT_FETCH_OPTIONS: any = {
redirect: "follow",
follow: 1,
headers: {
"user-agent":
"Mozilla/5.0 (compatible; Fosscord/1.0; +https://github.com/fosscord/fosscord)",
},
// size: 1024 * 1024 * 5, // grabbed from config later
compress: true,
method: "GET",
};
export const getProxyUrl = (url: URL, width: number, height: number) => {
const { endpointPublic, resizeWidthMax, resizeHeightMax } = Config.get().cdn;
width = Math.min(width || 500, resizeWidthMax || width);
height = Math.min(height || 500, resizeHeightMax || width);
return `${endpointPublic}/external/resize/${encodeURIComponent(url.href)}?width=${width}&height=${height}`;
};
export const getMetaDescriptions = async (text: string) => {
const $ = cheerio.load(text);
return {
title: $('meta[property="og:title"]').attr("content"),
provider_name: $('meta[property="og:site_name"]').text(),
author: $('meta[property="article:author"]').attr("content"),
description:
$('meta[property="og:description"]').attr("content") ||
$('meta[property="description"]').attr("content"),
image: $('meta[property="og:image"]').attr("content") || $(`meta[property="twitter:image"]`).attr("content"),
width: parseInt(
$('meta[property="og:image:width"]').attr("content") ||
"",
) || undefined,
height: parseInt(
$('meta[property="og:image:height"]').attr("content") ||
"",
) || undefined,
url: $('meta[property="og:url"]').attr("content"),
youtube_embed: $(`meta[property="og:video:secure_url"]`).attr("content"),
};
};
const doFetch = async (url: URL) => {
try {
return await fetch(url, {
...DEFAULT_FETCH_OPTIONS,
size: Config.get().limits.message.maxEmbedDownloadSize,
});
}
catch (e) {
return null;
}
};
const genericImageHandler = async (url: URL): Promise<Embed | null> => {
const response = await doFetch(url);
if (!response) return null;
const metas = await getMetaDescriptions(await response.text());
if (!metas.width || !metas.height) {
const result = await probe(url.href);
metas.width = result.width;
metas.height = result.height;
}
return {
url: url.href,
type: EmbedType.image,
thumbnail: {
width: metas.width,
height: metas.height,
url: url.href,
proxy_url: getProxyUrl(new URL(metas.image || url.href), metas.width, metas.height),
}
};
};
export const EmbedHandlers: { [key: string]: (url: URL) => Promise<Embed | null>; } = {
// the url does not have a special handler
"default": async (url: URL) => {
const response = await doFetch(url);
if (!response) return null;
if (response.headers.get("content-type")?.indexOf("image") !== -1) {
// this is an image
const size = imageSize(await response.buffer());
return {
url: url.href,
type: EmbedType.image,
image: {
width: size.width,
height: size.height,
url: url.href,
proxy_url: getProxyUrl(url, size.width!, size.height!),
}
};
}
const metas = await getMetaDescriptions(await response.text());
return {
url: url.href,
type: EmbedType.link,
title: metas.title,
thumbnail: {
width: metas.width,
height: metas.height,
url: metas.image,
proxy_url: getProxyUrl(new URL(metas.image!), metas.width!, metas.height!),
},
description: metas.description,
};
},
"giphy.com": genericImageHandler,
"media4.giphy.com": genericImageHandler,
"tenor.com": genericImageHandler,
"c.tenor.com": genericImageHandler,
"media.tenor.com": genericImageHandler,
// TODO: twitter, facebook
// have to use their APIs or something because they don't send the metas in initial html
"open.spotify.com": async (url: URL) => {
const response = await doFetch(url);
if (!response) return null;
const metas = await getMetaDescriptions(await response.text());
return {
url: url.href,
type: EmbedType.link,
title: metas.title,
description: metas.description,
thumbnail: {
width: 640,
height: 640,
proxy_url: getProxyUrl(new URL(metas.image!), 640, 640),
url: metas.image,
},
provider: {
url: "https://spotify.com",
name: "Spotify",
}
};
},
"pixiv.net": async (url: URL) => { return EmbedHandlers["www.pixiv.net"](url); },
"www.pixiv.net": async (url: URL) => {
const response = await doFetch(url);
if (!response) return null;
const metas = await getMetaDescriptions(await response.text());
// TODO: doesn't show images. think it's a bug in the cdn
return {
url: url.href,
type: EmbedType.image,
title: metas.title,
description: metas.description,
image: {
width: metas.width,
height: metas.height,
url: url.href,
proxy_url: getProxyUrl(new URL(metas.image!), metas.width!, metas.height!),
},
provider: {
url: "https://pixiv.net",
name: "Pixiv"
}
};
},
"store.steampowered.com": async (url: URL) => {
const response = await doFetch(url);
if (!response) return null;
const metas = await getMetaDescriptions(await response.text());
return {
url: url.href,
type: EmbedType.rich,
title: metas.title,
description: metas.description,
image: { // TODO: meant to be thumbnail.
// isn't this standard across all of steam?
width: 460,
height: 215,
url: metas.image,
proxy_url: getProxyUrl(new URL(metas.image!), 460, 215),
},
provider: {
url: "https://store.steampowered.com",
name: "Steam"
},
// TODO: fields for release date
// TODO: Video
};
},
"reddit.com": async (url: URL) => { return EmbedHandlers["www.reddit.com"](url); },
"www.reddit.com": async (url: URL) => {
const res = await EmbedHandlers["default"](url);
return {
...res,
color: 16777215,
provider: {
name: "reddit"
}
};
},
"youtube.com": async (url: URL) => { return EmbedHandlers["www.youtube.com"](url); },
"www.youtube.com": async (url: URL): Promise<Embed | null> => {
const response = await doFetch(url);
if (!response) return null;
const metas = await getMetaDescriptions(await response.text());
return {
video: {
// TODO: does this adjust with aspect ratio?
width: metas.width,
height: metas.height,
url: metas.youtube_embed!,
},
url: url.href,
type: EmbedType.video,
title: metas.title,
thumbnail: {
width: metas.width,
height: metas.height,
url: metas.image,
proxy_url: getProxyUrl(new URL(metas.image!), metas.width!, metas.height!),
},
provider: {
url: "https://www.youtube.com",
name: "YouTube",
},
description: metas.description,
color: 16711680,
author: {
name: metas.author,
// TODO: author channel url
}
};
},
// the url is an image from this instance
"self": async (url: URL): Promise<Embed | null> => {
const result = await probe(url.href);
return {
url: url.href,
type: EmbedType.image,
thumbnail: {
width: result.width,
height: result.height,
url: url.href,
proxy_url: url.href,
}
};
},
};
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