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fix(slack): scope attachment extraction to forwarded shares

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Sebastian
2026-02-16 20:36:55 -05:00
parent fb996031bc
commit 67250f059a
4 changed files with 171 additions and 9 deletions
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37
src/slack/monitor/media.ts
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@@ -1,9 +1,9 @@
import type { WebClient as SlackWebClient } from "@slack/web-api";
import { normalizeHostname } from "../../infra/net/hostname.js";
import type { FetchLike } from "../../media/fetch.js";
import type { SlackAttachment, SlackFile } from "../types.js";
import { normalizeHostname } from "../../infra/net/hostname.js";
import { fetchRemoteMedia } from "../../media/fetch.js";
import { saveMediaBuffer } from "../../media/store.js";
import type { SlackAttachment, SlackFile } from "../types.js";
function isSlackHostname(hostname: string): boolean {
const normalized = normalizeHostname(hostname);
@@ -133,6 +133,28 @@ export type SlackMediaResult = {
const MAX_SLACK_MEDIA_FILES = 8;
const MAX_SLACK_MEDIA_CONCURRENCY = 3;
const MAX_SLACK_FORWARDED_ATTACHMENTS = 8;
function isForwardedSlackAttachment(attachment: SlackAttachment): boolean {
// Narrow this parser to Slack's explicit "shared/forwarded" attachment payloads.
return attachment.is_share === true;
}
function resolveForwardedAttachmentImageUrl(attachment: SlackAttachment): string | null {
const rawUrl = attachment.image_url?.trim();
if (!rawUrl) {
return null;
}
try {
const parsed = new URL(rawUrl);
if (parsed.protocol !== "https:" || !isSlackHostname(parsed.hostname)) {
return null;
}
return parsed.toString();
} catch {
return null;
}
}
async function mapLimit<T, R>(
items: T[],
@@ -230,10 +252,17 @@ export async function resolveSlackAttachmentContent(params: {
return null;
}
const forwardedAttachments = attachments
.filter((attachment) => isForwardedSlackAttachment(attachment))
.slice(0, MAX_SLACK_FORWARDED_ATTACHMENTS);
if (forwardedAttachments.length === 0) {
return null;
}
const textBlocks: string[] = [];
const allMedia: SlackMediaResult[] = [];
for (const att of attachments) {
for (const att of forwardedAttachments) {
const text = att.text?.trim() || att.fallback?.trim();
if (text) {
const author = att.author_name;
@@ -241,7 +270,7 @@ export async function resolveSlackAttachmentContent(params: {
textBlocks.push(`${heading}\n${text}`);
}
const imageUrl = att.image_url;
const imageUrl = resolveForwardedAttachmentImageUrl(att);
if (imageUrl) {
try {
const fetched = await fetchRemoteMedia({