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PNG_BASE64,
imageFormRequest,
readSseEvents,
startHangingImagesStreamUpstream,
startImagesAcceptedTaskStreamFallbackUpstream,
startImagesJsonUpstream,
startImagesStreamFallbackUpstream,
startStreamingImageUpstream
} from './route-test-helpers';
import { registerRouteTestLifecycle } from './route-test-setup';
import assert from 'node:assert/strict';
import { describe, it } from 'node:test';
registerRouteTestLifecycle();
describe('POST /api/images Images API streaming', { concurrency: false }, () => {
it('normalizes OtokAPI image stream events into the stable client SSE contract', async () => {
const { POST } = await import('./route');
let upstreamBody = '';
const upstream = await startStreamingImageUpstream(async (body) => {
upstreamBody = body;
return [
{
event: 'image.generation.chunk',
data: { b64_json: 'partial-base64' }
},
{
event: 'image.generation.result',
data: {
data: [{ b64_json: PNG_BASE64 }],
usage: { input_tokens: 1, output_tokens: 2, total_tokens: 3 }
}
}
];
});
try {
const response = await POST(
imageFormRequest({
apiBaseUrl: upstream.baseUrl,
apiKey: 'test-key',
stream: true
})
);
assert.equal(response.status, 200);
assert.equal(response.headers.get('content-type'), 'text/event-stream');
const events = await readSseEvents(response);
assert.equal(events.length, 3);
assert.equal(events[0].type, 'partial_image');
assert.equal(events[0].b64_json, 'partial-base64');
assert.equal(events[1].type, 'completed');
assert.equal(events[1].b64_json, PNG_BASE64);
assert.equal(events[1].output_format, 'png');
assert.equal(events[2].type, 'done');
assert.equal((events[2].images as Array<Record<string, unknown>>)[0].b64_json, PNG_BASE64);
const upstreamJson = JSON.parse(upstreamBody) as Record<string, unknown>;
assert.equal(upstreamJson.stream, true);
assert.equal(upstreamJson.partial_images, 2);
} finally {
await upstream.close();
}
});
it('uses a non-streaming channel request mode when page auto streaming has no SSE channel', async () => {
const { POST } = await import('./route');
const upstreamBodies: string[] = [];
let observedIdempotencyKey: string | string[] | undefined;
const upstream = await startImagesJsonUpstream(async (body, _url, request) => {
if (request.method === 'POST') {
upstreamBodies.push(body);
observedIdempotencyKey = request.headers['idempotency-key'];
}
return { data: [{ b64_json: PNG_BASE64 }] };
});
process.env.OPENAI_CHANNEL_1_ID = 'json-only';
process.env.OPENAI_CHANNEL_1_BASE_URL = upstream.baseUrl;
process.env.OPENAI_CHANNEL_1_API_KEYS = 'test-key';
process.env.OPENAI_CHANNEL_1_REQUEST_MODES = 'images-non-stream';
try {
const response = await POST(
imageFormRequest({
streamMode: 'auto'
})
);
assert.equal(response.status, 200);
assert.notEqual(response.headers.get('content-type'), 'text/event-stream');
assert.equal(upstreamBodies.length, 1);
const upstreamJson = JSON.parse(upstreamBodies[0] || '{}') as Record<string, unknown>;
assert.equal(upstreamJson.stream, false);
assert.equal(Object.hasOwn(upstreamJson, 'partial_images'), false);
assert.equal(observedIdempotencyKey, 'client-route-stream');
} finally {
await upstream.close();
}
});
it('passes force_request through page generation and lets upstream decide small sizes', async () => {
const { POST } = await import('./route');
const upstreamBodies: string[] = [];
const upstream = await startImagesJsonUpstream(async (body, _url, request) => {
if (request.method === 'POST') {
upstreamBodies.push(body);
}
return { data: [{ b64_json: PNG_BASE64 }] };
});
process.env.OPENAI_CHANNEL_1_ID = 'json-force';
process.env.OPENAI_CHANNEL_1_BASE_URL = upstream.baseUrl;
process.env.OPENAI_CHANNEL_1_API_KEYS = 'test-key';
process.env.OPENAI_CHANNEL_1_REQUEST_MODES = 'images-non-stream';
try {
const response = await POST(
imageFormRequest({
streamMode: 'auto',
size: '512x512',
forceRequest: 'true',
clientRequestId: 'force-small-size'
})
);
assert.equal(response.status, 200);
assert.equal(upstreamBodies.length, 1);
const upstreamJson = JSON.parse(upstreamBodies[0] || '{}') as Record<string, unknown>;
assert.equal(upstreamJson.size, '512x512');
} finally {
await upstream.close();
}
});
it('uses the lower-cost non-streaming channel request mode for page auto streaming by default', async () => {
const { POST } = await import('./route');
const upstreamBodies: string[] = [];
const upstream = await startImagesJsonUpstream(async (body, _url, request) => {
if (request.method === 'POST') {
upstreamBodies.push(body);
}
return { data: [{ b64_json: PNG_BASE64 }] };
});
process.env.OPENAI_CHANNEL_1_ID = 'mixed';
process.env.OPENAI_CHANNEL_1_BASE_URL = upstream.baseUrl;
process.env.OPENAI_CHANNEL_1_API_KEYS = 'test-key';
process.env.OPENAI_CHANNEL_1_REQUEST_MODES = 'images-non-stream,images-sse';
try {
const response = await POST(
imageFormRequest({
streamMode: 'auto'
})
);
assert.equal(response.status, 200);
assert.notEqual(response.headers.get('content-type'), 'text/event-stream');
assert.equal(upstreamBodies.length, 1);
const upstreamJson = JSON.parse(upstreamBodies[0] || '{}') as Record<string, unknown>;
assert.equal(upstreamJson.stream, false);
assert.equal(Object.hasOwn(upstreamJson, 'partial_images'), false);
} finally {
await upstream.close();
}
});
it('retries accepted async image tasks with the same upstream idempotency key', async () => {
const { POST } = await import('./route');
const observedIdempotencyKeys: Array<string | string[] | undefined> = [];
let upstreamCalls = 0;
const upstream = await startImagesJsonUpstream(async (_body, _url, request) => {
if (request.method !== 'POST') {
return { data: [{ b64_json: PNG_BASE64 }] };
}
upstreamCalls += 1;
observedIdempotencyKeys.push(request.headers['idempotency-key']);
if (upstreamCalls === 1) {
return {
object: 'image.task',
status: 'pending',
task_id: 'sync-gen-task',
poll_url: '/api/image-tasks?ids=sync-gen-task'
};
}
return { data: [{ b64_json: PNG_BASE64 }] };
});
process.env.OPENAI_CHANNEL_1_ID = 'json-task';
process.env.OPENAI_CHANNEL_1_BASE_URL = upstream.baseUrl;
process.env.OPENAI_CHANNEL_1_API_KEYS = 'test-key';
process.env.OPENAI_CHANNEL_1_REQUEST_MODES = 'images-non-stream';
try {
const response = await POST(
imageFormRequest({
streamMode: 'auto',
clientRequestId: 'accepted-task-retry-key'
})
);
assert.equal(response.status, 200);
assert.notEqual(response.headers.get('content-type'), 'text/event-stream');
assert.equal(upstreamCalls, 2);
assert.deepEqual(observedIdempotencyKeys, ['accepted-task-retry-key', 'accepted-task-retry-key']);
} finally {
await upstream.close();
}
});
it('retries accepted async edit tasks with the same upstream idempotency key', async () => {
const { POST } = await import('./route');
const observedIdempotencyKeys: Array<string | string[] | undefined> = [];
let upstreamCalls = 0;
const upstream = await startImagesJsonUpstream(async (_body, _url, request) => {
if (request.method !== 'POST') {
return { data: [{ b64_json: PNG_BASE64 }] };
}
upstreamCalls += 1;
observedIdempotencyKeys.push(request.headers['idempotency-key']);
if (upstreamCalls === 1) {
return {
object: 'image.task',
status: 'pending',
task_id: 'sync-edit-task',
poll_url: '/api/image-tasks?ids=sync-edit-task'
};
}
return { data: [{ b64_json: PNG_BASE64 }] };
});
process.env.OPENAI_CHANNEL_1_ID = 'json-edit-task';
process.env.OPENAI_CHANNEL_1_BASE_URL = upstream.baseUrl;
process.env.OPENAI_CHANNEL_1_API_KEYS = 'test-key';
process.env.OPENAI_CHANNEL_1_REQUEST_MODES = 'images-non-stream';
try {
const response = await POST(
imageFormRequest({
mode: 'edit',
streamMode: 'auto',
clientRequestId: 'accepted-edit-task-retry-key'
})
);
assert.equal(response.status, 200);
assert.notEqual(response.headers.get('content-type'), 'text/event-stream');
assert.equal(upstreamCalls, 2);
assert.deepEqual(observedIdempotencyKeys, ['accepted-edit-task-retry-key', 'accepted-edit-task-retry-key']);
} finally {
await upstream.close();
}
});
it('fails explicit page stream requests instead of falling back to non-streaming request modes', async () => {
const { POST } = await import('./route');
const upstreamBodies: string[] = [];
const upstream = await startImagesJsonUpstream(async (body, _url, request) => {
if (request.method === 'POST') {
upstreamBodies.push(body);
}
return { data: [{ b64_json: PNG_BASE64 }] };
});
process.env.OPENAI_CHANNEL_1_ID = 'json-only';
process.env.OPENAI_CHANNEL_1_BASE_URL = upstream.baseUrl;
process.env.OPENAI_CHANNEL_1_API_KEYS = 'test-key';
process.env.OPENAI_CHANNEL_1_REQUEST_MODES = 'images-non-stream';
try {
const response = await POST(
imageFormRequest({
streamMode: 'stream',
imageStreamingStrategy: 'openai-sse'
})
);
assert.equal(response.status, 503);
const body = (await response.json()) as { error?: string };
assert.match(body.error || '', /images-sse/);
assert.equal(upstreamBodies.length, 0);
} finally {
await upstream.close();
}
});
it('keeps the stable SSE contract for SDK-parsed multi-image results without partial events', async () => {
const { POST } = await import('./route');
const upstream = await startStreamingImageUpstream(async () => [
{
data: {
data: [{ b64_json: PNG_BASE64 }, { b64_json: PNG_BASE64 }]
}
}
]);
try {
const response = await POST(
imageFormRequest({
apiBaseUrl: upstream.baseUrl,
apiKey: 'test-key',
stream: true
})
);
assert.equal(response.status, 200);
assert.equal(response.headers.get('content-type'), 'text/event-stream');
const events = await readSseEvents(response);
assert.deepEqual(
events.map((event) => event.type),
['completed', 'completed', 'done']
);
assert.equal((events[2].images as Array<Record<string, unknown>>).length, 2);
} finally {
await upstream.close();
}
});
it('normalizes JSON Images responses returned to stream requests into the stable SSE contract', async () => {
const { POST } = await import('./route');
let upstreamBody = '';
const upstream = await startImagesJsonUpstream(async (body) => {
if (!body) return { ok: true };
upstreamBody = body;
return { data: [{ b64_json: PNG_BASE64 }] };
});
try {
const response = await POST(
imageFormRequest({
apiBaseUrl: upstream.baseUrl,
apiKey: 'test-key',
stream: true,
imageStreamingStrategy: 'newapi-keepalive-sse'
})
);
assert.equal(response.status, 200);
assert.equal(response.headers.get('content-type'), 'text/event-stream');
const events = await readSseEvents(response);
assert.deepEqual(
events.map((event) => event.type),
['completed', 'done']
);
assert.equal(events[0].b64_json, PNG_BASE64);
assert.equal((events[1].images as Array<Record<string, unknown>>)[0].b64_json, PNG_BASE64);
const upstreamJson = JSON.parse(upstreamBody) as Record<string, unknown>;
assert.equal(upstreamJson.stream, true);
assert.equal(upstreamJson.partial_images, 2);
} finally {
await upstream.close();
}
});
it('allows Matsca-compatible Images API streams to request four partial images', async () => {
let upstreamBody = '';
let upstreamAppId: string | string[] | undefined;
let upstreamAppSecret: string | string[] | undefined;
const upstream = await startStreamingImageUpstream(async (body, _url, request) => {
upstreamBody = body;
upstreamAppId = request.headers['x-app-id'];
upstreamAppSecret = request.headers['x-app-secret'];
return [
{
event: 'image.generation.result',
data: {
data: [{ b64_json: PNG_BASE64 }]
}
}
];
});
try {
process.env.OPENAI_CHANNEL_1_ID = 'matsca';
process.env.OPENAI_CHANNEL_1_API_KEYS = 'test-key';
process.env.OPENAI_CHANNEL_1_BASE_URL = upstream.baseUrl;
process.env.OPENAI_CHANNEL_1_UPSTREAM_PROFILE = 'matsca';
process.env.OPENAI_CHANNEL_1_REQUEST_MODES = 'images-non-stream,images-sse';
process.env.OPENAI_CHANNEL_1_MATSCA_APP_ID = 'app-id';
process.env.OPENAI_CHANNEL_1_MATSCA_APP_SECRET = 'app-secret';
process.env.OPENAI_CHANNEL_RECOVERY_PROBE_ENABLED = 'false';
process.env.OPENAI_CHANNEL_REQUIRE_PROBE_FOR_RECOVERY = 'false';
const { resetServerChannelStateForTests } = await import('@/lib/server-channel-router');
resetServerChannelStateForTests();
const { POST } = await import('./route');
const response = await POST(
imageFormRequest({
stream: true,
partialImages: '4'
})
);
assert.equal(response.status, 200);
assert.equal(response.headers.get('content-type'), 'text/event-stream');
await readSseEvents(response);
const upstreamJson = JSON.parse(upstreamBody) as Record<string, unknown>;
assert.equal(upstreamJson.partial_images, 4);
assert.equal(upstreamAppId, 'app-id');
assert.equal(upstreamAppSecret, 'app-secret');
} finally {
await upstream.close();
}
});
it('keeps same-credential page SSE requests queued until the active stream is released', async () => {
const upstream = await startHangingImagesStreamUpstream();
try {
process.env.OPENAI_CHANNEL_1_ID = 'official';
process.env.OPENAI_CHANNEL_1_API_KEYS = 'test-key';
process.env.OPENAI_CHANNEL_1_BASE_URL = upstream.baseUrl;
process.env.OPENAI_CHANNEL_1_REQUEST_MODES = 'images-non-stream,images-sse';
process.env.OPENAI_CHANNEL_RECOVERY_PROBE_ENABLED = 'false';
process.env.OPENAI_CHANNEL_REQUIRE_PROBE_FOR_RECOVERY = 'false';
process.env.OPENAI_MAX_STREAMS_PER_CREDENTIAL = '1';
process.env.OPENAI_CHANNEL_QUEUE_MAX_WAIT_MS = '1000';
const { resetServerChannelStateForTests } = await import('@/lib/server-channel-router');
resetServerChannelStateForTests();
const { POST } = await import('./route');
const firstResponse = await POST(
imageFormRequest({
stream: true,
clientRequestId: 'client-route-queue-1'
})
);
await upstream.waitForStreamRequest();
assert.equal(upstream.calls.length, 1);
const secondPromise = POST(
imageFormRequest({
stream: true,
clientRequestId: 'client-route-queue-2'
})
);
await new Promise((resolve) => setTimeout(resolve, 50));
assert.equal(upstream.calls.length, 1);
await firstResponse.body?.cancel();
const secondResponse = await secondPromise;
assert.equal(secondResponse.status, 200);
assert.equal(secondResponse.headers.get('X-Channel-Queue-Queued'), 'true');
assert.equal(upstream.calls.length, 2);
await secondResponse.body?.cancel();
} finally {
await upstream.close();
}
});
it('allows Matsca-compatible JSON generation fields through server channels', async () => {
let upstreamBody = '';
let upstreamAppId: string | string[] | undefined;
let upstreamAppSecret: string | string[] | undefined;
const upstream = await startImagesJsonUpstream(async (body, _url, request) => {
if (request.method === 'POST' && request.url?.endsWith('/images/generations')) {
upstreamBody = body;
upstreamAppId = request.headers['x-app-id'];
upstreamAppSecret = request.headers['x-app-secret'];
}
return {
data: [{ b64_json: PNG_BASE64 }]
};
});
try {
process.env.OPENAI_CHANNEL_1_ID = 'matsca';
process.env.OPENAI_CHANNEL_1_API_KEYS = 'test-key';
process.env.OPENAI_CHANNEL_1_BASE_URL = upstream.baseUrl;
process.env.OPENAI_CHANNEL_1_UPSTREAM_PROFILE = 'matsca';
process.env.OPENAI_CHANNEL_1_REQUEST_MODES = 'images-non-stream';
process.env.OPENAI_CHANNEL_1_MATSCA_APP_ID = 'app-id';
process.env.OPENAI_CHANNEL_1_MATSCA_APP_SECRET = 'app-secret';
process.env.OPENAI_CHANNEL_RECOVERY_PROBE_ENABLED = 'false';
process.env.OPENAI_CHANNEL_REQUIRE_PROBE_FOR_RECOVERY = 'false';
const { resetServerChannelStateForTests } = await import('@/lib/server-channel-router');
resetServerChannelStateForTests();
const { POST } = await import('./route');
const response = await POST(
imageFormRequest({
streamMode: 'non_stream',
n: '4',
size: '123x456',
background: 'transparent'
})
);
assert.equal(response.status, 200);
const upstreamJson = JSON.parse(upstreamBody) as Record<string, unknown>;
assert.equal(upstreamJson.n, 4);
assert.equal(upstreamJson.size, '123x456');
assert.equal(upstreamJson.background, 'transparent');
assert.equal(upstreamAppId, 'app-id');
assert.equal(upstreamAppSecret, 'app-secret');
} finally {
await upstream.close();
}
});
it('returns upstream diagnostics when JSON Images responses omit image data', async () => {
const { POST } = await import('./route');
const upstream = await startImagesJsonUpstream(async () => ({ data: [{ status: 'done' }] }));
try {
const response = await POST(
imageFormRequest({
apiBaseUrl: upstream.baseUrl,
apiKey: 'test-key',
streamMode: 'non_stream'
})
);
assert.equal(response.status, 502);
const body = (await response.json()) as {
error?: string;
diagnostics?: { category?: string; structure?: unknown };
};
assert.match(body.error || '', /不是 OpenAI Images 格式/);
assert.equal(body.diagnostics?.category, 'unknown_response_format');
assert.equal(JSON.stringify(body.diagnostics).includes('test-key'), false);
} finally {
await upstream.close();
}
});
it('falls back from force-sse auto streaming without a final image and skips streaming for the same mark', async () => {
const { POST } = await import('./route');
const { getServerChannelState } = await import('@/lib/server-channel-router');
const upstream = await startImagesStreamFallbackUpstream();
const otherUpstream = await startImagesStreamFallbackUpstream();
try {
const first = await POST(
imageFormRequest({
apiBaseUrl: upstream.baseUrl,
apiKey: 'test-key',
streamMode: 'auto',
imageStreamingStrategy: 'force-sse',
clientRequestId: 'client-route-auto-fallback-1'
})
);
assert.equal(first.status, 200);
assert.equal(first.headers.get('content-type'), 'text/event-stream');
const events = await readSseEvents(first);
assert.deepEqual(
events.map((event) => event.type),
['partial_image', 'completed', 'done']
);
assert.equal(events[2].fallback_used, true);
assert.deepEqual(
upstream.calls.map((call) => call.stream),
[true, false]
);
assert.equal(getServerChannelState().streamingAvailability.summary().mark_count, 1);
const second = await POST(
imageFormRequest({
apiBaseUrl: upstream.baseUrl,
apiKey: 'test-key',
streamMode: 'auto',
imageStreamingStrategy: 'force-sse',
clientRequestId: 'client-route-auto-fallback-2'
})
);
assert.equal(second.status, 200);
assert.notEqual(second.headers.get('content-type'), 'text/event-stream');
const body = (await second.json()) as { images?: Array<Record<string, unknown>> };
assert.equal(body.images?.[0]?.b64_json, PNG_BASE64);
assert.deepEqual(
upstream.calls.map((call) => call.stream),
[true, false, false]
);
const third = await POST(
imageFormRequest({
apiBaseUrl: otherUpstream.baseUrl,
apiKey: 'test-key',
streamMode: 'auto',
imageStreamingStrategy: 'force-sse',
clientRequestId: 'client-route-auto-fallback-3'
})
);
assert.equal(third.status, 200);
assert.equal(third.headers.get('content-type'), 'text/event-stream');
await readSseEvents(third);
assert.deepEqual(
otherUpstream.calls.map((call) => call.stream),
[true, false]
);
} finally {
await upstream.close();
await otherUpstream.close();
}
});
it('retries accepted async image tasks after force-sse auto stream fallback with the same idempotency key', async () => {
const { POST } = await import('./route');
const upstream = await startImagesAcceptedTaskStreamFallbackUpstream();
try {
const response = await POST(
imageFormRequest({
apiBaseUrl: upstream.baseUrl,
apiKey: 'test-key',
streamMode: 'auto',
imageStreamingStrategy: 'force-sse',
clientRequestId: 'client-route-auto-fallback-task'
})
);
assert.equal(response.status, 200);
assert.equal(response.headers.get('content-type'), 'text/event-stream');
const events = await readSseEvents(response);
assert.deepEqual(
events.map((event) => event.type),
['partial_image', 'completed', 'done']
);
assert.equal(events[2].fallback_used, true);
assert.deepEqual(
upstream.calls.map((call) => call.stream),
[true, false, false]
);
assert.deepEqual(
upstream.calls.map((call) => call.idempotencyKey),
[
'client-route-auto-fallback-task',
'client-route-auto-fallback-task',
'client-route-auto-fallback-task'
]
);
} finally {
await upstream.close();
}
});
it('does not mark force-sse auto streaming unavailable when the page SSE request is aborted', async () => {
const { POST } = await import('./route');
const { getServerChannelState } = await import('@/lib/server-channel-router');
const upstream = await startHangingImagesStreamUpstream();
const abortController = new AbortController();
try {
const response = await POST(
imageFormRequest({
apiBaseUrl: upstream.baseUrl,
apiKey: 'test-key',
streamMode: 'auto',
imageStreamingStrategy: 'force-sse',
clientRequestId: 'client-route-auto-abort',
signal: abortController.signal
})
);
assert.equal(response.status, 200);
assert.equal(response.headers.get('content-type'), 'text/event-stream');
const reader = response.body?.getReader();
assert.ok(reader);
await upstream.waitForStreamRequest();
abortController.abort();
await reader.cancel();
await new Promise((resolve) => setTimeout(resolve, 25));
assert.deepEqual(
upstream.calls.map((call) => call.stream),
[true]
);
assert.equal(getServerChannelState().streamingAvailability.summary().mark_count, 0);
} finally {
abortController.abort();
await upstream.close();
}
});
it('returns an explicit SSE error when the upstream completed event has no image payload', async () => {
const { POST } = await import('./route');
const upstream = await startStreamingImageUpstream(async () => [
{
event: 'image.generation.result',
data: {
data: [{ status: 'done' }]
}
}
]);
try {
const response = await POST(
imageFormRequest({
apiBaseUrl: upstream.baseUrl,
apiKey: 'test-key',
stream: true
})
);
assert.equal(response.status, 200);
assert.equal(response.headers.get('content-type'), 'text/event-stream');
const events = await readSseEvents(response);
assert.equal(events.length, 1);
assert.equal(events[0].type, 'error');
assert.match(String(events[0].error), /b64_json/);
} finally {
await upstream.close();
}
});
it('turns upstream stream failures into the stable SSE error contract', async () => {
const { POST } = await import('./route');
const upstream = await startStreamingImageUpstream(async () => [
{
event: 'image.generation.chunk',
data: { b64_json: 'partial-before-failure' }
},
{ abortAfter: true, data: { status: 'upstream connection closed' } }
]);
try {
const response = await POST(
imageFormRequest({
apiBaseUrl: upstream.baseUrl,
apiKey: 'test-key',
stream: true
})
);
assert.equal(response.status, 200);
assert.equal(response.headers.get('content-type'), 'text/event-stream');
const events = await readSseEvents(response);
assert.deepEqual(
events.map((event) => event.type),
['partial_image', 'error']
);
assert.match(String(events[1].error), /terminated|aborted|closed|stream/i);
} finally {
await upstream.close();
}
});
});
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