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Proxy captions via new /proxy route

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We can add more authorized paths to authorizedPaths if we need
more resources to be pulled from the NewLeaf/Invidious backend
on the same domain.

This route forwards to the client a few headers like Bibliogram
https://git.sr.ht/~cadence/bibliogram/tree/ea7cd5d5/item/src/site/api/proxy.js#L28-29
so we can also use this route to possibly proxy videos in the
future.

We are strict about the url parameter not overriding the
NewLeaf/Invidious backend (instanceOrigin) by ensuring
fetchURL has instanceOrigin as prefix.
This commit is contained in:
Lomanic 2021-05-22 02:32:43 +02:00 committed by Cadence Ember
parent db49bb38b0
commit eb111a44c4
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GPG Key ID: BC1C2C61CF521B17
3 changed files with 32 additions and 27 deletions
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27
api/captions.js
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@ -1,27 +0,0 @@
/** @type {import("node-fetch").default} */
// @ts-ignore
const fetch = require("node-fetch")
const {getUser} = require("../utils/getuser")
const constants = require("../utils/constants.js")
module.exports = [
{
route: `/api/v1/captions/(${constants.regex.video_id})`, methods: ["GET"], code: async ({req, fill, url}) => {
const instanceOrigin = getUser(req).getSettingsOrDefaults().instance
const fetchURL = new URL(`${url.pathname}${url.search}`, instanceOrigin)
return fetch(fetchURL.toString()).then(res => {
return res.text().then(text => {
if (res.status === 200) {
// Remove the position annotations that youtube unhelpfully provides
text = text.replace(/(--> \S+).*/g, "$1")
}
return {
statusCode: res.status,
contentType: res.headers.get("content-type"),
content: text
}
})
})
}
}
]

27
api/proxy.js Normal file
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@ -0,0 +1,27 @@
const {proxy} = require("pinski/plugins")
const {getUser} = require("../utils/getuser")
const constants = require("../utils/constants.js")
// list of paths relative to the backend this route is authorized to serve
const authorizedPaths = [`/api/v1/captions/(${constants.regex.video_id})`]
// headers relayed as-is from the proxied backend to the client
const proxiedHeaders = ["content-type", "date", "last-modified", "expires", "cache-control", "accept-ranges", "content-range", "origin", "etag", "content-length", "transfer-encoding"]
module.exports = [
{
route: `/proxy`, methods: ["GET"], code: async ({req, fill, url}) => {
const instanceOrigin = getUser(req).getSettingsOrDefaults().instance
const remotePath = url.searchParams.get("url")
const fetchURL = new URL(remotePath, instanceOrigin)
if (!fetchURL.toString().startsWith(instanceOrigin) || !authorizedPaths.some(element => fetchURL.pathname.match(new RegExp(`^${element}$`)))) {
return {
statusCode: 401,
content: "CloudTube: Unauthorized",
contentType: "text/plain"
}
}
return proxy(fetchURL, {}, (h) => Object.keys(h).filter(key => proxiedHeaders.includes(key)).reduce((res, key) => (res[key] = h[key], res), {}))
}
}
]

5
api/video.js
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@ -174,6 +174,11 @@ module.exports = [
// rewrite description
video.descriptionHtml = converters.rewriteVideoDescription(video.descriptionHtml, id)
// rewrite captions urls so they are served on the same domain via the /proxy route
for (const caption of video.captions) {
caption.url = `/proxy?${new URLSearchParams({"url": caption.url})}`
}
return render(200, "pug/video.pug", {
url, video, formats, subscribed, instanceOrigin, mediaFragment, autoplay, continuous,
sessionWatched, sessionWatchedNext