Add consent-gated media exchange library

tests/matrix-client.test.ts

@@ -14,6 +14,38 @@ const creds = {
   capturedAt: Date.now(),
 };
 
+describe('MatrixClient outbound image media', () => {
+  it('uploads raw bytes and sends an m.image event with a stable transaction ID', async () => {
+    const calls: Array<{ url: string; init?: RequestInit }> = [];
+    const fetchImpl = ((url: string | URL | Request, init?: RequestInit) => {
+      calls.push({ url: String(url), init });
+      if (String(url).includes('/upload')) {
+        return Promise.resolve(new Response(JSON.stringify({ content_uri: 'mxc://reddit.com/image-one' }), {
+          status: 200, headers: { 'content-type': 'application/json' },
+        }));
+      }
+      return Promise.resolve(new Response(JSON.stringify({ event_id: '$image-event' }), {
+        status: 200, headers: { 'content-type': 'application/json' },
+      }));
+    }) as typeof fetch;
+    const client = new MatrixClient(creds, createMockLogger(), { minRequestIntervalMs: 0, fetchImpl });
+
+    const mxc = await client.uploadImage(Buffer.from([1, 2, 3]), 'image/jpeg', 'portrait.jpg');
+    await expect(client.sendImageMessage(
+      '!room:reddit.com', 'portrait.jpg', mxc,
+      { mimeType: 'image/jpeg', size: 3, width: 10, height: 20 }, 'stable-image-txn',
+    )).resolves.toBe('$image-event');
+
+    expect(calls[0].url).toContain('/_matrix/media/v3/upload?filename=portrait.jpg');
+    expect(new Headers(calls[0].init?.headers).get('content-type')).toBe('image/jpeg');
+    expect(calls[1].url).toContain('/stable-image-txn');
+    expect(JSON.parse(String(calls[1].init?.body))).toEqual({
+      msgtype: 'm.image', body: 'portrait.jpg', url: 'mxc://reddit.com/image-one',
+      info: { mimetype: 'image/jpeg', size: 3, w: 10, h: 20 },
+    });
+  });
+});
+
 describe('MatrixClient HTTP timeout', () => {
   it('loads an encoded Matrix user profile with bearer authentication', async () => {
     let requestedUrl = '';