fix: improve oauth error and model discovery fallbacks

src/server/routes/api/oauth.test.ts

@@ -385,6 +385,154 @@ describe('oauth routes', { timeout: 15_000 }, () => {
     });
   });
 
+  it('marks gemini oauth session as error when token exchange fails before account persistence', async () => {
+    fetchMock.mockResolvedValueOnce({
+      ok: false,
+      status: 400,
+      json: async () => ({
+        error: 'invalid_grant',
+        error_description: 'Bad Request',
+      }),
+      text: async () => '{"error":"invalid_grant","error_description":"Bad Request"}',
+    });
+
+    const startResponse = await app.inject({
+      method: 'POST',
+      url: '/api/oauth/providers/gemini-cli/start',
+      payload: {
+        projectId: 'demo-project',
+      },
+      headers: {
+        host: 'metapi.example',
+        'x-forwarded-proto': 'https',
+      },
+    });
+    const startBody = startResponse.json() as { state: string };
+
+    const callbackResponse = await app.inject({
+      method: 'POST',
+      url: `/api/oauth/sessions/${encodeURIComponent(startBody.state)}/manual-callback`,
+      payload: {
+        callbackUrl: `http://localhost:8085/oauth2callback?state=${encodeURIComponent(startBody.state)}&code=oauth-code-gemini-123`,
+      },
+    });
+    expect(callbackResponse.statusCode).toBe(500);
+    expect(callbackResponse.json()).toMatchObject({
+      message: expect.stringContaining('invalid_grant'),
+    });
+
+    const sessionResponse = await app.inject({
+      method: 'GET',
+      url: `/api/oauth/sessions/${startBody.state}`,
+    });
+    expect(sessionResponse.statusCode).toBe(200);
+    expect(sessionResponse.json()).toMatchObject({
+      provider: 'gemini-cli',
+      status: 'error',
+      error: expect.stringContaining('invalid_grant'),
+    });
+
+    const accounts = await db.select().from(schema.accounts).all();
+    expect(accounts).toEqual([]);
+  });
+
+  it('defaults Gemini CLI oauth to the first available Google Cloud project when projectId is omitted', async () => {
+    fetchMock
+      .mockResolvedValueOnce({
+        ok: true,
+        status: 200,
+        json: async () => ({
+          access_token: 'gemini-access-token',
+          refresh_token: 'gemini-refresh-token',
+          expires_in: 3600,
+          token_type: 'Bearer',
+          scope: 'cloud-platform',
+        }),
+        text: async () => JSON.stringify({ ok: true }),
+      })
+      .mockResolvedValueOnce({
+        ok: true,
+        status: 200,
+        json: async () => ({
+          projects: [
+            { projectId: 'first-project-id' },
+            { projectId: 'second-project-id' },
+          ],
+        }),
+        text: async () => JSON.stringify({ ok: true }),
+      })
+      .mockResolvedValueOnce({
+        ok: true,
+        status: 200,
+        json: async () => ({ state: 'ENABLED' }),
+        text: async () => JSON.stringify({ state: 'ENABLED' }),
+      })
+      .mockResolvedValueOnce({
+        ok: true,
+        status: 200,
+        json: async () => ({ email: 'gemini-user@example.com' }),
+        text: async () => JSON.stringify({ email: 'gemini-user@example.com' }),
+      })
+      .mockResolvedValueOnce({
+        ok: true,
+        status: 200,
+        json: async () => ({ state: 'ENABLED' }),
+        text: async () => JSON.stringify({ state: 'ENABLED' }),
+      });
+
+    const startResponse = await app.inject({
+      method: 'POST',
+      url: '/api/oauth/providers/gemini-cli/start',
+      headers: {
+        host: 'metapi.example',
+        'x-forwarded-proto': 'https',
+      },
+    });
+    expect(startResponse.statusCode).toBe(200);
+    const startBody = startResponse.json() as { state: string };
+
+    const callbackResponse = await app.inject({
+      method: 'POST',
+      url: `/api/oauth/sessions/${encodeURIComponent(startBody.state)}/manual-callback`,
+      payload: {
+        callbackUrl: `http://localhost:8085/oauth2callback?state=${encodeURIComponent(startBody.state)}&code=gemini-oauth-code-123`,
+      },
+    });
+    expect(callbackResponse.statusCode).toBe(200);
+    expect(callbackResponse.json()).toEqual({ success: true });
+
+    const sessionResponse = await app.inject({
+      method: 'GET',
+      url: `/api/oauth/sessions/${startBody.state}`,
+    });
+    expect(sessionResponse.statusCode).toBe(200);
+    expect(sessionResponse.json()).toMatchObject({
+      provider: 'gemini-cli',
+      status: 'success',
+    });
+
+    const accounts = await db.select().from(schema.accounts).all();
+    expect(accounts).toHaveLength(1);
+    expect(accounts[0]).toMatchObject({
+      oauthProvider: 'gemini-cli',
+      oauthProjectId: 'first-project-id',
+      username: 'gemini-user@example.com',
+      accessToken: 'gemini-access-token',
+    });
+
+    const parsed = JSON.parse(accounts[0]?.extraConfig || '{}');
+    expect(parsed.oauth).toMatchObject({
+      provider: 'gemini-cli',
+      email: 'gemini-user@example.com',
+      projectId: 'first-project-id',
+      refreshToken: 'gemini-refresh-token',
+    });
+
+    expect(String(fetchMock.mock.calls[1]?.[0] || '')).toContain('cloudresourcemanager.googleapis.com/v1/projects');
+    expect(String(fetchMock.mock.calls[2]?.[0] || '')).toContain('/projects/first-project-id/services/cloudaicompanion.googleapis.com');
+    expect(String(fetchMock.mock.calls[4]?.[0] || '')).toContain('/projects/first-project-id/services/cloudaicompanion.googleapis.com');
+  });
+
   it('lists oauth connection health metadata and supports deleting the connection', async () => {
     const site = await db.insert(schema.sites).values({
       name: 'ChatGPT Codex OAuth',

src/server/services/modelService.discovery.test.ts

@@ -482,13 +482,27 @@ describe('refreshModelsForAccount credential discovery', () => {
     expect(parsed.runtimeHealth?.state).toBe('unhealthy');
   });
 
-  it('discovers antigravity oauth models via direct credential routing', async () => {
+  it('discovers antigravity oauth models via fetchAvailableModels fallback using the oauth project id', async () => {
     getApiTokenMock.mockResolvedValue(null);
-    getModelsMock.mockImplementation(async (_baseUrl: string, token: string) => (
-      token === 'antigravity-access-token'
-        ? ['gemini-3-pro-preview', 'claude-sonnet-4-5-20250929']
-        : []
-    ));
+    getModelsMock.mockRejectedValue(new Error('antigravity oauth discovery should not call adapter.getModels'));
+    undiciFetchMock
+      .mockResolvedValueOnce({
+        ok: false,
+        status: 503,
+        json: async () => ({ error: 'unavailable' }),
+        text: async () => 'unavailable',
+      })
+      .mockResolvedValueOnce({
+        ok: true,
+        status: 200,
+        json: async () => ({
+          models: {
+            'gemini-3-pro-preview': { displayName: 'Gemini 3 Pro Preview' },
+            'claude-sonnet-4-5-20250929': { displayName: 'Claude Sonnet 4.5' },
+          },
+        }),
+        text: async () => JSON.stringify({ ok: true }),
+      });
 
     const site = await db.insert(schema.sites).values({
       name: 'antigravity-site',
@@ -526,11 +540,19 @@ describe('refreshModelsForAccount credential discovery', () => {
       modelCount: 2,
       modelsPreview: ['gemini-3-pro-preview', 'claude-sonnet-4-5-20250929'],
     });
-    expect(getModelsMock).toHaveBeenCalledWith(
-      'https://cloudcode-pa.googleapis.com',
-      'antigravity-access-token',
-      undefined,
-    );
+    expect(getModelsMock).not.toHaveBeenCalled();
+    expect(undiciFetchMock).toHaveBeenCalledTimes(2);
+    expect(String(undiciFetchMock.mock.calls[0]?.[0] || '')).toBe('https://cloudcode-pa.googleapis.com/v1internal:fetchAvailableModels');
+    expect(String(undiciFetchMock.mock.calls[1]?.[0] || '')).toBe('https://daily-cloudcode-pa.googleapis.com/v1internal:fetchAvailableModels');
+    expect(undiciFetchMock.mock.calls[0]?.[1]).toMatchObject({
+      method: 'POST',
+      headers: expect.objectContaining({
+        Authorization: 'Bearer antigravity-access-token',
+      }),
+    });
+    expect(JSON.parse(String(undiciFetchMock.mock.calls[0]?.[1]?.body || '{}'))).toEqual({
+      project: 'project-demo',
+    });
 
     const rows = await db.select().from(schema.modelAvailability)
       .where(eq(schema.modelAvailability.accountId, account.id))

src/server/services/modelService.ts

@@ -22,6 +22,14 @@ import { withSiteRecordProxyRequestInit } from './siteProxy.js';
 import { getCodexOauthInfoFromExtraConfig, isCodexPlatform } from './oauth/codexAccount.js';
 import { buildOauthInfo, getOauthInfoFromExtraConfig } from './oauth/oauthAccount.js';
 import { CLAUDE_DEFAULT_ANTHROPIC_VERSION } from './oauth/claudeProvider.js';
+import {
+  ANTIGRAVITY_CLIENT_METADATA,
+  ANTIGRAVITY_DAILY_UPSTREAM_BASE_URL,
+  ANTIGRAVITY_GOOGLE_API_CLIENT,
+  ANTIGRAVITY_SANDBOX_DAILY_UPSTREAM_BASE_URL,
+  ANTIGRAVITY_UPSTREAM_BASE_URL,
+  ANTIGRAVITY_USER_AGENT,
+} from './oauth/antigravityProvider.js';
 import {
   GEMINI_CLI_GOOGLE_API_CLIENT,
   GEMINI_CLI_REQUIRED_SERVICE,
@@ -184,6 +192,46 @@ function extractCodexModelIds(payload: unknown): string[] {
   });
 }
 
+function normalizeBaseUrl(baseUrl: string): string {
+  return (baseUrl || '').replace(/\/+$/, '');
+}
+
+function extractAntigravityModelIds(payload: unknown): string[] {
+  if (!payload || typeof payload !== 'object') return [];
+  const record = payload as { models?: unknown };
+  if (record.models && typeof record.models === 'object' && !Array.isArray(record.models)) {
+    return Object.keys(record.models).map((name) => name.trim()).filter(Boolean);
+  }
+  if (!Array.isArray(record.models)) return [];
+  return record.models.flatMap((item) => {
+    if (typeof item === 'string') {
+      const trimmed = item.trim();
+      return trimmed ? [trimmed] : [];
+    }
+    if (!item || typeof item !== 'object' || Array.isArray(item)) return [];
+    const value = item as { id?: unknown; name?: unknown };
+    const id = typeof value.id === 'string'
+      ? value.id.trim()
+      : (typeof value.name === 'string' ? value.name.trim() : '');
+    return id ? [id] : [];
+  });
+}
+
+function buildAntigravityDiscoveryBaseUrls(siteUrl: string): string[] {
+  const seen = new Set<string>();
+  return [
+    siteUrl,
+    ANTIGRAVITY_UPSTREAM_BASE_URL,
+    ANTIGRAVITY_DAILY_UPSTREAM_BASE_URL,
+    ANTIGRAVITY_SANDBOX_DAILY_UPSTREAM_BASE_URL,
+  ].flatMap((candidate) => {
+    const normalized = normalizeBaseUrl(candidate);
+    if (!normalized || seen.has(normalized)) return [];
+    seen.add(normalized);
+    return [normalized];
+  });
+}
+
 async function updateOauthModelDiscoveryState(input: {
   account: typeof schema.accounts.$inferSelect;
   checkedAt: string;
@@ -297,6 +345,51 @@ async function validateGeminiCliOauthConnection(input: {
   }
 }
 
+async function discoverAntigravityModelsFromCloud(input: {
+  site: typeof schema.sites.$inferSelect;
+  account: typeof schema.accounts.$inferSelect;
+}): Promise<string[]> {
+  const accessToken = (input.account.accessToken || '').trim();
+  if (!accessToken) {
+    throw new Error('antigravity oauth access token missing');
+  }
+
+  const oauth = getOauthInfoFromExtraConfig(input.account.extraConfig);
+  const requestBody = oauth?.projectId ? { project: oauth.projectId } : {};
+  let lastError = '';
+
+  for (const baseUrl of buildAntigravityDiscoveryBaseUrls(input.site.url || ANTIGRAVITY_UPSTREAM_BASE_URL)) {
+    const response = await fetch(
+      `${baseUrl}/v1internal:fetchAvailableModels`,
+      withSiteRecordProxyRequestInit(input.site, {
+        method: 'POST',
+        headers: {
+          Authorization: `Bearer ${accessToken}`,
+          Accept: 'application/json',
+          'Content-Type': 'application/json',
+          'User-Agent': ANTIGRAVITY_USER_AGENT,
+          'X-Goog-Api-Client': ANTIGRAVITY_GOOGLE_API_CLIENT,
+          'Client-Metadata': ANTIGRAVITY_CLIENT_METADATA,
+        },
+        body: JSON.stringify(requestBody),
+      }),
+    );
+    if (!response.ok) {
+      lastError = await response.text().catch(() => '') || `HTTP ${response.status}`;
+      continue;
+    }
+
+    const payload = await response.json();
+    const models = normalizeModels(extractAntigravityModelIds(payload));
+    if (models.length > 0) {
+      return models;
+    }
+    lastError = '未获取到可用模型';
+  }
+
+  throw new Error(lastError || '未获取到可用模型');
+}
+
 function isExactModelPattern(modelPattern: string): boolean {
   const normalized = modelPattern.trim();
   if (!normalized) return false;
@@ -632,6 +725,76 @@ export async function refreshModelsForAccount(accountId: number): Promise<ModelR
     }
   }
 
+  if (oauth?.provider === 'antigravity') {
+    const checkedAt = new Date().toISOString();
+    const startedAt = Date.now();
+    try {
+      const antigravityModels = await withTimeout(
+        () => discoverAntigravityModelsFromCloud({ site, account }),
+        MODEL_DISCOVERY_TIMEOUT_MS,
+        `antigravity model discovery timeout (${Math.round(MODEL_DISCOVERY_TIMEOUT_MS / 1000)}s)`,
+      );
+      if (antigravityModels.length === 0) {
+        throw new Error('未获取到可用模型');
+      }
+
+      await db.insert(schema.modelAvailability).values(
+        antigravityModels.map((modelName) => ({
+          accountId,
+          modelName,
+          available: true,
+          latencyMs: Date.now() - startedAt,
+          checkedAt,
+        })),
+      ).run();
+      await updateOauthModelDiscoveryState({
+        account,
+        checkedAt,
+        status: 'healthy',
+        lastDiscoveredModels: antigravityModels,
+      });
+      await setAccountRuntimeHealth(accountId, {
+        state: 'healthy',
+        reason: 'Antigravity OAuth 健康探测成功',
+        source: 'model-discovery',
+        checkedAt,
+      });
+      return buildSuccessfulRefreshResult({
+        accountId,
+        modelCount: antigravityModels.length,
+        modelsPreview: antigravityModels.slice(0, 10),
+        tokenScanned: 0,
+        discoveredByCredential: true,
+        discoveredApiToken: false,
+      });
+    } catch (err) {
+      const rawMessage = (err as { message?: string })?.message || 'antigravity model discovery failed';
+      const errorCode = classifyModelDiscoveryError(rawMessage);
+      const errorMessage = `Antigravity 模型获取失败（${rawMessage}）`;
+      await updateOauthModelDiscoveryState({
+        account,
+        checkedAt,
+        status: 'abnormal',
+        lastModelSyncError: errorMessage,
+        lastDiscoveredModels: [],
+      });
+      await setAccountRuntimeHealth(account.id, {
+        state: 'unhealthy',
+        reason: errorMessage,
+        source: 'model-discovery',
+        checkedAt,
+      });
+      return buildFailedRefreshResult({
+        accountId,
+        errorCode,
+        errorMessage,
+        tokenScanned: 0,
+        discoveredByCredential: false,
+        discoveredApiToken: false,
+      });
+    }
+  }
+
   if (!adapter) {
     return buildSkippedRefreshResult(accountId, 'adapter_or_status', '平台不可用或账号未激活');
   }

src/server/services/oauth/antigravityProvider.ts

@@ -11,6 +11,8 @@ export const ANTIGRAVITY_LOOPBACK_CALLBACK_PORT = 51121;
 export const ANTIGRAVITY_LOOPBACK_CALLBACK_PATH = '/oauth-callback';
 export const ANTIGRAVITY_LOOPBACK_REDIRECT_URI = `http://localhost:${ANTIGRAVITY_LOOPBACK_CALLBACK_PORT}${ANTIGRAVITY_LOOPBACK_CALLBACK_PATH}`;
 export const ANTIGRAVITY_UPSTREAM_BASE_URL = 'https://cloudcode-pa.googleapis.com';
+export const ANTIGRAVITY_DAILY_UPSTREAM_BASE_URL = 'https://daily-cloudcode-pa.googleapis.com';
+export const ANTIGRAVITY_SANDBOX_DAILY_UPSTREAM_BASE_URL = 'https://daily-cloudcode-pa.sandbox.googleapis.com';
 export const ANTIGRAVITY_GOOGLE_API_CLIENT = 'google-cloud-sdk vscode_cloudshelleditor/0.1';
 export const ANTIGRAVITY_USER_AGENT = 'google-api-nodejs-client/9.15.1';
 export const ANTIGRAVITY_CLIENT_METADATA = '{"ideType":"IDE_UNSPECIFIED","platform":"PLATFORM_UNSPECIFIED","pluginType":"GEMINI"}';

src/server/services/oauth/geminiCliProvider.ts

@@ -156,16 +156,16 @@ async function resolveGeminiProjectId(accessToken: string, requestedProjectId?:
   }
 
   const projects = await fetchGcpProjects(accessToken);
-  if (projects.length === 1 && projects[0]) {
-    await ensureGeminiProjectEnabled(accessToken, projects[0]);
-    return projects[0];
-  }
-
   if (projects.length <= 0) {
     throw new Error('no Google Cloud projects available for this account');
   }
 
-  throw new Error('gemini cli: project selection required');
+  const firstProject = projects[0];
+  if (!firstProject) {
+    throw new Error('no Google Cloud projects available for this account');
+  }
+  await ensureGeminiProjectEnabled(accessToken, firstProject);
+  return firstProject;
 }
 
 export const geminiCliOauthProvider: OAuthProviderDefinition = {

src/server/services/oauth/service.ts

@@ -356,6 +356,7 @@ export async function handleOauthCallback(input: {
     throw new Error('missing oauth code');
   }
 
+  try {
     const exchange = await definition.exchangeAuthorizationCode({
       code,
       state: input.state,
@@ -390,6 +391,15 @@ export async function handleOauthCallback(input: {
       siteId: site.id,
     });
     return { accountId: account.id, siteId: site.id };
+  } catch (error) {
+    const message = (
+      error instanceof Error
+        ? (error.message || error.name)
+        : String(error || 'OAuth failed')
+    ).trim() || 'OAuth failed';
+    markOauthSessionError(input.state, message);
+    throw error;
+  }
 }
 
 export async function submitOauthManualCallback(input: {