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Interpret Matrix media spoilers

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Cadence Ember
2025-12-06 03:10:51 +13:00
parent 261bb1b8c8
commit 653e38a9d2
3 changed files with 165 additions and 16 deletions
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src/m2d/converters/event-to-message.js
+32 -13
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@@ -555,25 +555,40 @@ async function eventToMessage(event, guild, di) {
// Handle images first - might need to handle their `body`/`formatted_body` as well, which will fall through to the text processor
let shouldProcessTextEvent = event.type === "m.room.message" && (event.content.msgtype === "m.text" || event.content.msgtype === "m.emote")
if (event.type === "m.room.message" && (event.content.msgtype === "m.file" || event.content.msgtype === "m.video" || event.content.msgtype === "m.audio" || event.content.msgtype === "m.image")) {
// Build message content in addition to the uploaded file
const fileIsSpoiler = event.content["page.codeberg.everypizza.msc4193.spoiler"]
const fileSpoilerReason = event.content["page.codeberg.everypizza.msc4193.spoiler.reason"]
content = ""
const captionContent = new mxUtils.MatrixStringBuilder()
// Caption from Matrix message
const fileHasCaption = (event.content.body && event.content.filename && event.content.body !== event.content.filename) || event.content.formatted_body
if (fileHasCaption) {
captionContent.addLine(event.content.body || "", event.content.formatted_body || tag`${event.content.body || ""}`)
}
// Spoiler message
if (fileIsSpoiler && typeof fileSpoilerReason === "string") {
captionContent.addLine(`(Spoiler: ${fileSpoilerReason})`)
}
// File link as alternative to uploading
if (!("file" in event.content) && event.content.info?.size > getFileSizeForGuild(guild)) {
// Upload (unencrypted) file as link, because it's too large for Discord
// Do this by constructing a sample Matrix message with the link and then use the text processor to convert that + the original caption.
const url = mxUtils.getPublicUrlForMxc(event.content.url)
assert(url)
const filename = event.content.filename || event.content.body
const newText = new mxUtils.MatrixStringBuilder()
const emoji = attachmentEmojis.has(event.content.msgtype) ? attachmentEmojis.get(event.content.msgtype) + " " : ""
newText.addLine(`${emoji}Uploaded file: ${url} (${pb(event.content.info.size)})`, tag`${emoji}<em>Uploaded file: <a href="${url}">${filename}</a> (${pb(event.content.info.size)})</em>`)
// Check if the event has a caption that we need to add as well
if ((event.content.body && event.content.filename && event.content.body !== event.content.filename) || event.content.formatted_body) {
newText.addLine(event.content.body || "", event.content.formatted_body || tag`${event.content.body || ""}`)
if (fileIsSpoiler) {
captionContent.addLine(`${emoji}Uploaded SPOILER file: <${url}> (${pb(event.content.info.size)})`, tag`${emoji}<em>Uploaded <strong>SPOILER</strong> file: <span data-mx-spoiler><a href="${url} ">${filename}</a></span> (${pb(event.content.info.size)})</em>`) // the space is necessary to work around a bug in Discord's URL previewer. the preview still gets blurred in the client.
} else {
captionContent.addLine(`${emoji}Uploaded file: ${url} (${pb(event.content.info.size)})`, tag`${emoji}<em>Uploaded file: <a href="${url}">${filename}</a> (${pb(event.content.info.size)})</em>`)
}
Object.assign(event.content, newText.get())
shouldProcessTextEvent = true
} else {
// Upload file as file
content = ""
const filename = event.content.filename || event.content.body
let filename = event.content.filename || event.content.body
if (fileIsSpoiler) filename = "SPOILER_" + filename
if ("file" in event.content) {
// Encrypted
assert.equal(event.content.file.key.alg, "A256CTR")
@@ -584,12 +599,16 @@ async function eventToMessage(event, guild, di) {
attachments.push({id: "0", filename})
pendingFiles.push({name: filename, mxc: event.content.url})
}
// Check if we also need to process a text event for this image - if it has a caption that's different from its filename
if ((event.content.body && event.content.filename && event.content.body !== event.content.filename) || event.content.formatted_body) {
shouldProcessTextEvent = true
}
}
// Add result to content
const result = captionContent.get()
if (result.body) {
Object.assign(event.content, {body: result.body, format: result.format, formatted_body: result.formatted_body})
shouldProcessTextEvent = true
}
}
if (event.type === "m.sticker") {
content = ""
let filename = event.content.body