Telegram/Discord: honor outbound mediaMaxMb uploads (#38065)

* Telegram: default media cap to 100MB

* Telegram: honor outbound mediaMaxMb

* Discord: add shared media upload cap

* Discord: pass mediaMaxMb to outbound sends

* Telegram: cover outbound media cap sends

* Discord: cover media upload cap config

* Docs: update Telegram media cap guide

* Docs: update Telegram config reference

* Changelog: note media upload cap fix

* Docs: note Discord upload cap behavior

src/discord/send.outbound.ts

@@ -145,6 +145,10 @@ export async function sendMessageDiscord(
     accountId: accountInfo.accountId,
   });
   const chunkMode = resolveChunkMode(cfg, "discord", accountInfo.accountId);
+  const mediaMaxBytes =
+    typeof accountInfo.config.mediaMaxMb === "number"
+      ? accountInfo.config.mediaMaxMb * 1024 * 1024
+      : 8 * 1024 * 1024;
   const textWithTables = convertMarkdownTables(text ?? "", tableMode);
   const textWithMentions = rewriteDiscordKnownMentions(textWithTables, {
     accountId: accountInfo.accountId,
@@ -211,6 +215,7 @@ export async function sendMessageDiscord(
           mediaCaption ?? "",
           opts.mediaUrl,
           opts.mediaLocalRoots,
+          mediaMaxBytes,
           undefined,
           request,
           accountInfo.config.maxLinesPerMessage,
@@ -271,6 +276,7 @@ export async function sendMessageDiscord(
         textWithMentions,
         opts.mediaUrl,
         opts.mediaLocalRoots,
+        mediaMaxBytes,
         opts.replyTo,
         request,
         accountInfo.config.maxLinesPerMessage,

src/discord/send.sends-basic-channel-messages.test.ts

@@ -1,5 +1,6 @@
 import { ChannelType, PermissionFlagsBits, Routes } from "discord-api-types/v10";
 import { beforeEach, describe, expect, it, vi } from "vitest";
+import { loadWebMedia } from "../web/media.js";
 import {
   __resetDiscordDirectoryCacheForTest,
   rememberDiscordDirectoryUser,
@@ -265,6 +266,33 @@ describe("sendMessageDiscord", () => {
         }),
       }),
     );
+    expect(loadWebMedia).toHaveBeenCalledWith(
+      "file:///tmp/photo.jpg",
+      expect.objectContaining({ maxBytes: 8 * 1024 * 1024 }),
+    );
+  });
+
+  it("uses configured discord mediaMaxMb for uploads", async () => {
+    const { rest, postMock } = makeDiscordRest();
+    postMock.mockResolvedValue({ id: "msg", channel_id: "789" });
+
+    await sendMessageDiscord("channel:789", "photo", {
+      rest,
+      token: "t",
+      mediaUrl: "file:///tmp/photo.jpg",
+      cfg: {
+        channels: {
+          discord: {
+            mediaMaxMb: 32,
+          },
+        },
+      },
+    });
+
+    expect(loadWebMedia).toHaveBeenCalledWith(
+      "file:///tmp/photo.jpg",
+      expect.objectContaining({ maxBytes: 32 * 1024 * 1024 }),
+    );
   });
 
   it("sends media with empty text without content field", async () => {

src/discord/send.shared.ts

@@ -415,6 +415,7 @@ async function sendDiscordMedia(
   text: string,
   mediaUrl: string,
   mediaLocalRoots: readonly string[] | undefined,
+  maxBytes: number | undefined,
   replyTo: string | undefined,
   request: DiscordRequest,
   maxLinesPerMessage?: number,
@@ -423,7 +424,10 @@ async function sendDiscordMedia(
   chunkMode?: ChunkMode,
   silent?: boolean,
 ) {
-  const media = await loadWebMedia(mediaUrl, buildOutboundMediaLoadOptions({ mediaLocalRoots }));
+  const media = await loadWebMedia(
+    mediaUrl,
+    buildOutboundMediaLoadOptions({ maxBytes, mediaLocalRoots }),
+  );
   const chunks = text ? buildDiscordTextChunks(text, { maxLinesPerMessage, chunkMode }) : [];
   const caption = chunks[0] ?? "";
   const messageReference = replyTo ? { message_id: replyTo, fail_if_not_exists: false } : undefined;