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Remove expiry params from attachment URL

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Cadence Ember 2023-10-01 01:27:03 +13:00
parent 1d99b91ef7
commit 6c1ae6aba1
2 changed files with 39 additions and 6 deletions
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23
matrix/file.js
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@ -13,6 +13,13 @@ const IMAGE_SIZE = 1024
/** @type {Map<string, Promise<string>>} */ /** @type {Map<string, Promise<string>>} */
const inflight = new Map() const inflight = new Map()
/**
* @param {string} url
*/
function _removeExpiryParams(url) {
return url.replace(/\?(?:(?:ex|is|sg|hm)=[a-f0-9]+&?)*$/, "")
}
/** /**
* @param {string} path * @param {string} path
*/ */
@ -26,14 +33,17 @@ async function uploadDiscordFileToMxc(path) {
url = DISCORD_IMAGES_BASE + path url = DISCORD_IMAGES_BASE + path
} }
// Discord attachment content is always the same no matter what their ?ex parameter is.
const urlNoExpiry = _removeExpiryParams(url)
// Are we uploading this file RIGHT NOW? Return the same inflight promise with the same resolution // Are we uploading this file RIGHT NOW? Return the same inflight promise with the same resolution
const existingInflight = inflight.get(url) const existingInflight = inflight.get(urlNoExpiry)
if (existingInflight) { if (existingInflight) {
return existingInflight return existingInflight
} }
// Has this file already been uploaded in the past? Grab the existing copy from the database. // Has this file already been uploaded in the past? Grab the existing copy from the database.
const existingFromDb = select("file", "mxc_url", "WHERE discord_url = ?").pluck().get(url) const existingFromDb = select("file", "mxc_url", "WHERE discord_url = ?").pluck().get(urlNoExpiry)
if (typeof existingFromDb === "string") { if (typeof existingFromDb === "string") {
return existingFromDb return existingFromDb
} }
@ -41,15 +51,15 @@ async function uploadDiscordFileToMxc(path) {
// Download from Discord // Download from Discord
const promise = fetch(url, {}).then(/** @param {import("node-fetch").Response} res */ async res => { const promise = fetch(url, {}).then(/** @param {import("node-fetch").Response} res */ async res => {
// Upload to Matrix // Upload to Matrix
const root = await module.exports._actuallyUploadDiscordFileToMxc(url, res) const root = await module.exports._actuallyUploadDiscordFileToMxc(urlNoExpiry, res)
// Store relationship in database // Store relationship in database
db.prepare("INSERT INTO file (discord_url, mxc_url) VALUES (?, ?)").run(url, root.content_uri) db.prepare("INSERT INTO file (discord_url, mxc_url) VALUES (?, ?)").run(urlNoExpiry, root.content_uri)
inflight.delete(url) inflight.delete(urlNoExpiry)
return root.content_uri return root.content_uri
}) })
inflight.set(url, promise) inflight.set(urlNoExpiry, promise)
return promise return promise
} }
@ -108,3 +118,4 @@ module.exports.stickerFormat = stickerFormat
module.exports.sticker = sticker module.exports.sticker = sticker
module.exports.uploadDiscordFileToMxc = uploadDiscordFileToMxc module.exports.uploadDiscordFileToMxc = uploadDiscordFileToMxc
module.exports._actuallyUploadDiscordFileToMxc = _actuallyUploadDiscordFileToMxc module.exports._actuallyUploadDiscordFileToMxc = _actuallyUploadDiscordFileToMxc
module.exports._removeExpiryParams = _removeExpiryParams

22
matrix/file.test.js Normal file
View file

@ -0,0 +1,22 @@
// @ts-check
const {test} = require("supertape")
const file = require("./file")
test("removeExpiryParams: url without params is unchanged", t => {
const url = "https://cdn.discordapp.com/attachments/1154455830591176734/1157034603496882267/59ce542f-bf66-4d9a-83b7-ad6d05a69bac.jpg"
const result = file._removeExpiryParams(url)
t.equal(result, url)
})
test("removeExpiryParams: params are removed", t => {
const url = "https://cdn.discordapp.com/attachments/112760669178241024/1157363960518029322/image.png?ex=651856ae&is=6517052e&hm=88353defb15cbd833e6977817e8f72f4ff28f4edfd26b8ad5f267a4f2b946e69&"
const result = file._removeExpiryParams(url)
t.equal(result, "https://cdn.discordapp.com/attachments/112760669178241024/1157363960518029322/image.png")
})
test("removeExpiryParams: rearranged params are removed", t => {
const url = "https://cdn.discordapp.com/attachments/112760669178241024/1157363960518029322/image.png?hm=88353defb15cbd833e6977817e8f72f4ff28f4edfd26b8ad5f267a4f2b946e69&ex=651856ae&is=6517052e"
const result = file._removeExpiryParams(url)
t.equal(result, "https://cdn.discordapp.com/attachments/112760669178241024/1157363960518029322/image.png")
})