spoiler fix

src/d2m/converters/message-to-event.js

@@ -135,7 +135,8 @@ const embedTitleParser = markdown.markdownEngine.parserFor({
  * @param {{fetch?: typeof fetch}} [di]
  */
 async function attachmentToEvent(mentions, attachment, alwaysLink, di) {
-	const external_url = dUtils.getPublicUrlForCdn(attachment.url)
+	const spoiler = attachment.filename.startsWith("SPOILER_") || !!((attachment.flags || 0) & DiscordTypes.AttachmentFlags.IsSpoiler);
+	const external_url = dUtils.getPublicUrlForCdn(attachment.url, spoiler ? "spoiler/" : "")
 	const emoji =
 		attachment.content_type?.startsWith("image/jp") ? "📸"
 		: attachment.content_type?.startsWith("image/") ? "🖼️"
@@ -143,15 +144,15 @@ async function attachmentToEvent(mentions, attachment, alwaysLink, di) {
 		: attachment.content_type?.startsWith("text/") ? "📝"
 		: attachment.content_type?.startsWith("audio/") ? "🎶"
 		: "📄"
-	// no native media spoilers in Element, so we'll post a link instead, forcing it to not preview using a blockquote
-	if (attachment.filename.startsWith("SPOILER_") || !!((attachment.flags || 0) & DiscordTypes.AttachmentFlags.IsSpoiler)) {
+	// no native media spoilers in Element, so we'll post a spoiler (unpreviewable) link instead
+	if (spoiler) {
 		return {
 			$type: "m.room.message",
 			"m.mentions": mentions,
 			msgtype: "m.text",
 			body: `${emoji} Uploaded SPOILER file: ${external_url} (${pb(attachment.size)})`,
 			format: "org.matrix.custom.html",
-			formatted_body: `<blockquote>${emoji} Uploaded SPOILER file: <a href="${external_url}">${external_url}</a> (${pb(attachment.size)})</blockquote>`
+			formatted_body: `${emoji} Uploaded <strong>SPOILER</strong> file: <a href="${external_url}">${external_url}</a> (${pb(attachment.size)})`
 		}
 	}
 	// attempt to convert large PNG image files to JPEG, since it's almost certainly a photo that was forced into PNG by the user copy-pasting.

src/discord/utils.js

@@ -134,14 +134,17 @@ function timestampToSnowflakeInexact(timestamp) {
 	return String((timestamp - EPOCH) * 2**22)
 }
 
-/** @param {string} url */
-function getPublicUrlForCdn(url) {
+/**
+ * @param {string} url
+ * @param {""|"spoiler/"} spoiler
+ */
+function getPublicUrlForCdn(url, spoiler="") {
 	const match = url.match(/https:\/\/(cdn|media)\.discordapp\.(?:com|net)\/attachments\/([0-9]+)\/([0-9]+)\/([-A-Za-z0-9_.,]+)/)
 	if (!match) return url
 	const unsignedHash = hasher.h64(match[3]) // attachment ID
 	const signedHash = unsignedHash - 0x8000000000000000n // shifting down to signed 64-bit range
 	db.prepare("INSERT OR IGNORE INTO media_proxy (permitted_hash) VALUES (?)").run(signedHash)
-	return `${reg.ooye.bridge_origin}/download/discord${match[1]}/${match[2]}/${match[3]}/${match[4]}`
+	return `${reg.ooye.bridge_origin}/download/discord${match[1]}${spoiler}/${match[2]}/${match[3]}/${match[4]}`
 }
 
 /**

src/web/routes/download-discord.js

@@ -9,7 +9,10 @@ let hasher = null
 // @ts-ignore
 require("xxhash-wasm")().then(h => hasher = h)
 
-const {discord, as, select} = require("../../passthrough")
+const {discord, as, select, sync} = require("../../passthrough")
+
+/** @type {import("../web-utils")} */
+const webUtils = sync.require("../web-utils")
 
 const schema = {
 	params: z.object({
@@ -40,10 +43,16 @@ function timeUntilExpiry(url) {
 	if (time > 0) return time
 }
 
-function defineMediaProxyHandler(domain) {
+/**
+ * @param {string} domain
+ * @param {boolean} spoiler
+ */
+function defineMediaProxyHandler(domain, spoiler) {
 	return defineEventHandler(async event => {
 		const params = await getValidatedRouterParams(event, schema.params.parse)
 
+		if (spoiler) webUtils.rejectUrlPreviewer(event)
+
 		const unsignedHash = hasher.h64(params.attachment_id)
 		const signedHash = unsignedHash - 0x8000000000000000n // shifting down to signed 64-bit range
 
@@ -81,7 +90,9 @@ function defineMediaProxyHandler(domain) {
 	})
 }
 
-as.router.get(`/download/discordcdn/:channel_id/:attachment_id/:file_name`, defineMediaProxyHandler("cdn.discordapp.com"))
-as.router.get(`/download/discordmedia/:channel_id/:attachment_id/:file_name`, defineMediaProxyHandler("media.discordapp.net"))
+as.router.get(`/download/discordcdn/:channel_id/:attachment_id/:file_name`, defineMediaProxyHandler("cdn.discordapp.com", false))
+as.router.get(`/download/discordmedia/:channel_id/:attachment_id/:file_name`, defineMediaProxyHandler("media.discordapp.net", false))
+as.router.get(`/download/discordcdn/:channel_id/spoiler/:attachment_id/:file_name`, defineMediaProxyHandler("cdn.discordapp.com", true))
+as.router.get(`/download/discordmedia/:channel_id/spoiler/:attachment_id/:file_name`, defineMediaProxyHandler("media.discordapp.net", true))
 
 module.exports._cache = cache