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758baa9fec
- custom-provider -> custom-provider-anthropic - gitlab-duo -> custom-provider-gitlab-duo - Update READMEs with custom provider section
404 lines
12 KiB
TypeScript
404 lines
12 KiB
TypeScript
/**
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* GitLab Duo Provider Extension
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*
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* Provides access to GitLab Duo AI models (Claude and GPT) through GitLab's AI Gateway.
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* Delegates to pi-ai's built-in Anthropic and OpenAI streaming implementations.
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*
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* Usage:
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* # First install dependencies
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* cd packages/coding-agent/examples/extensions/gitlab-duo && npm install
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*
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* # With OAuth (run /login gitlab-duo first)
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* pi -e ./packages/coding-agent/examples/extensions/gitlab-duo
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*
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* # With PAT
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* GITLAB_TOKEN=glpat-... pi -e ./packages/coding-agent/examples/extensions/gitlab-duo
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*
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* Then use /model to select gitlab-duo/duo-chat-sonnet-4-5
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*/
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import {
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type Api,
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type AssistantMessageEventStream,
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type Context,
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createAssistantMessageEventStream,
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type Model,
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type OAuthCredentials,
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type OAuthLoginCallbacks,
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type SimpleStreamOptions,
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streamSimple,
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} from "@mariozechner/pi-ai";
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import type { ExtensionAPI } from "@mariozechner/pi-coding-agent";
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// =============================================================================
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// Constants
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// =============================================================================
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const GITLAB_COM_URL = "https://gitlab.com";
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const AI_GATEWAY_URL = "https://cloud.gitlab.com";
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const ANTHROPIC_PROXY_URL = `${AI_GATEWAY_URL}/ai/v1/proxy/anthropic/`;
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const OPENAI_PROXY_URL = `${AI_GATEWAY_URL}/ai/v1/proxy/openai/v1`;
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// Bundled OAuth client ID for gitlab.com (from opencode-gitlab-auth, registered with localhost redirect)
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const BUNDLED_CLIENT_ID = "1d89f9fdb23ee96d4e603201f6861dab6e143c5c3c00469a018a2d94bdc03d4e";
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const OAUTH_SCOPES = ["api"];
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const REDIRECT_URI = "http://127.0.0.1:8080/callback";
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// Direct access token cache (25 min, tokens expire after 30 min)
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const DIRECT_ACCESS_TTL = 25 * 60 * 1000;
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// Model mappings: duo model ID -> backend config
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const MODEL_MAPPINGS: Record<
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string,
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{ api: "anthropic-messages" | "openai-completions"; backendModel: string; baseUrl: string }
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> = {
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"duo-chat-opus-4-5": {
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api: "anthropic-messages",
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backendModel: "claude-opus-4-5-20251101",
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baseUrl: ANTHROPIC_PROXY_URL,
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},
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"duo-chat-sonnet-4-5": {
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api: "anthropic-messages",
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backendModel: "claude-sonnet-4-5-20250929",
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baseUrl: ANTHROPIC_PROXY_URL,
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},
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"duo-chat-haiku-4-5": {
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api: "anthropic-messages",
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backendModel: "claude-haiku-4-5-20251001",
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baseUrl: ANTHROPIC_PROXY_URL,
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},
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"duo-chat-gpt-5-1": { api: "openai-completions", backendModel: "gpt-5.1-2025-11-13", baseUrl: OPENAI_PROXY_URL },
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"duo-chat-gpt-5-mini": {
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api: "openai-completions",
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backendModel: "gpt-5-mini-2025-08-07",
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baseUrl: OPENAI_PROXY_URL,
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},
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"duo-chat-gpt-5-codex": { api: "openai-completions", backendModel: "gpt-5-codex", baseUrl: OPENAI_PROXY_URL },
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};
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// =============================================================================
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// Direct Access Token Cache
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// =============================================================================
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interface DirectAccessToken {
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token: string;
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headers: Record<string, string>;
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expiresAt: number;
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}
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let cachedDirectAccess: DirectAccessToken | null = null;
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async function getDirectAccessToken(gitlabAccessToken: string): Promise<DirectAccessToken> {
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const now = Date.now();
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if (cachedDirectAccess && cachedDirectAccess.expiresAt > now) {
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return cachedDirectAccess;
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}
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const url = `${GITLAB_COM_URL}/api/v4/ai/third_party_agents/direct_access`;
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const response = await fetch(url, {
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method: "POST",
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headers: {
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Authorization: `Bearer ${gitlabAccessToken}`,
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"Content-Type": "application/json",
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},
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body: JSON.stringify({ feature_flags: { DuoAgentPlatformNext: true } }),
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});
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if (!response.ok) {
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const errorText = await response.text();
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if (response.status === 403) {
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throw new Error(
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`GitLab Duo access denied. Ensure GitLab Duo is enabled for your account. Error: ${errorText}`,
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);
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}
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throw new Error(`Failed to get direct access token: ${response.status} ${errorText}`);
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}
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const data = (await response.json()) as { token: string; headers: Record<string, string> };
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cachedDirectAccess = {
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token: data.token,
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headers: data.headers,
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expiresAt: now + DIRECT_ACCESS_TTL,
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};
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return cachedDirectAccess;
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}
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function invalidateDirectAccessToken() {
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cachedDirectAccess = null;
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}
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// =============================================================================
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// OAuth Implementation
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// =============================================================================
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async function generatePKCE(): Promise<{ verifier: string; challenge: string }> {
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const array = new Uint8Array(32);
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crypto.getRandomValues(array);
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const verifier = btoa(String.fromCharCode(...array))
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.replace(/\+/g, "-")
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.replace(/\//g, "_")
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.replace(/=+$/, "");
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const encoder = new TextEncoder();
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const data = encoder.encode(verifier);
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const hash = await crypto.subtle.digest("SHA-256", data);
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const challenge = btoa(String.fromCharCode(...new Uint8Array(hash)))
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.replace(/\+/g, "-")
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.replace(/\//g, "_")
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.replace(/=+$/, "");
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return { verifier, challenge };
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}
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async function loginGitLab(callbacks: OAuthLoginCallbacks): Promise<OAuthCredentials> {
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const { verifier, challenge } = await generatePKCE();
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const authParams = new URLSearchParams({
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client_id: BUNDLED_CLIENT_ID,
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redirect_uri: REDIRECT_URI,
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response_type: "code",
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scope: OAUTH_SCOPES.join(" "),
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code_challenge: challenge,
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code_challenge_method: "S256",
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state: crypto.randomUUID(),
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});
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callbacks.onAuth({ url: `${GITLAB_COM_URL}/oauth/authorize?${authParams.toString()}` });
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const callbackUrl = await callbacks.onPrompt({ message: "Paste the callback URL:" });
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const urlObj = new URL(callbackUrl);
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const code = urlObj.searchParams.get("code");
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if (!code) throw new Error("No authorization code found in callback URL");
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const tokenResponse = await fetch(`${GITLAB_COM_URL}/oauth/token`, {
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method: "POST",
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headers: { "Content-Type": "application/x-www-form-urlencoded" },
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body: new URLSearchParams({
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client_id: BUNDLED_CLIENT_ID,
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grant_type: "authorization_code",
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code,
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code_verifier: verifier,
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redirect_uri: REDIRECT_URI,
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}).toString(),
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});
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if (!tokenResponse.ok) throw new Error(`Token exchange failed: ${await tokenResponse.text()}`);
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const data = (await tokenResponse.json()) as {
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access_token: string;
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refresh_token: string;
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expires_in: number;
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created_at: number;
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};
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invalidateDirectAccessToken();
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return {
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refresh: data.refresh_token,
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access: data.access_token,
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expires: (data.created_at + data.expires_in) * 1000 - 5 * 60 * 1000,
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};
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}
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async function refreshGitLabToken(credentials: OAuthCredentials): Promise<OAuthCredentials> {
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const response = await fetch(`${GITLAB_COM_URL}/oauth/token`, {
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method: "POST",
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headers: { "Content-Type": "application/x-www-form-urlencoded" },
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body: new URLSearchParams({
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client_id: BUNDLED_CLIENT_ID,
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grant_type: "refresh_token",
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refresh_token: credentials.refresh,
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}).toString(),
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});
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if (!response.ok) throw new Error(`Token refresh failed: ${await response.text()}`);
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const data = (await response.json()) as {
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access_token: string;
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refresh_token: string;
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expires_in: number;
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created_at: number;
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};
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invalidateDirectAccessToken();
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return {
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refresh: data.refresh_token,
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access: data.access_token,
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expires: (data.created_at + data.expires_in) * 1000 - 5 * 60 * 1000,
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};
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}
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// =============================================================================
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// Main Stream Function - Delegates to pi-ai's built-in implementations
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// =============================================================================
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function streamGitLabDuo(
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model: Model<Api>,
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context: Context,
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options?: SimpleStreamOptions,
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): AssistantMessageEventStream {
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const stream = createAssistantMessageEventStream();
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(async () => {
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try {
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const gitlabAccessToken = options?.apiKey;
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if (!gitlabAccessToken) {
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throw new Error("No GitLab access token. Run /login gitlab-duo or set GITLAB_TOKEN");
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}
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const mapping = MODEL_MAPPINGS[model.id];
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if (!mapping) throw new Error(`Unknown model: ${model.id}`);
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// Get direct access token (cached)
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const directAccess = await getDirectAccessToken(gitlabAccessToken);
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// Create a proxy model that uses the backend API
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const proxyModel: Model<typeof mapping.api> = {
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...model,
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id: mapping.backendModel,
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api: mapping.api,
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baseUrl: mapping.baseUrl,
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};
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// Merge GitLab headers with Authorization bearer token
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const headers = {
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...directAccess.headers,
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Authorization: `Bearer ${directAccess.token}`,
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};
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// Delegate to pi-ai's built-in streaming
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const innerStream = streamSimple(proxyModel, context, {
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...options,
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apiKey: "gitlab-duo", // Dummy value to pass validation
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headers,
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});
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// Forward all events
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for await (const event of innerStream) {
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// Patch the model info back to gitlab-duo
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if ("partial" in event && event.partial) {
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event.partial.api = model.api;
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event.partial.provider = model.provider;
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event.partial.model = model.id;
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}
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if ("message" in event && event.message) {
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event.message.api = model.api;
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event.message.provider = model.provider;
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event.message.model = model.id;
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}
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if ("error" in event && event.error) {
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event.error.api = model.api;
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event.error.provider = model.provider;
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event.error.model = model.id;
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}
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stream.push(event);
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}
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stream.end();
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} catch (error) {
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stream.push({
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type: "error",
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reason: "error",
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error: {
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role: "assistant",
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content: [],
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api: model.api,
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provider: model.provider,
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model: model.id,
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usage: {
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input: 0,
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output: 0,
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cacheRead: 0,
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cacheWrite: 0,
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totalTokens: 0,
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cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0, total: 0 },
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},
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stopReason: "error",
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errorMessage: error instanceof Error ? error.message : String(error),
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timestamp: Date.now(),
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},
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});
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stream.end();
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}
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})();
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return stream;
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}
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// =============================================================================
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// Extension Entry Point
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// =============================================================================
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export default function (pi: ExtensionAPI) {
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pi.registerProvider("gitlab-duo", {
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baseUrl: AI_GATEWAY_URL,
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apiKey: "GITLAB_TOKEN",
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api: "gitlab-duo-api",
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models: [
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// Anthropic models
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{
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id: "duo-chat-opus-4-5",
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name: "GitLab Duo Claude Opus 4.5",
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reasoning: false,
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input: ["text"],
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cost: { input: 15, output: 75, cacheRead: 1.5, cacheWrite: 18.75 },
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contextWindow: 200000,
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maxTokens: 32000,
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},
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{
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id: "duo-chat-sonnet-4-5",
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name: "GitLab Duo Claude Sonnet 4.5",
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reasoning: false,
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input: ["text"],
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cost: { input: 3, output: 15, cacheRead: 0.3, cacheWrite: 3.75 },
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contextWindow: 200000,
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maxTokens: 16384,
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},
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{
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id: "duo-chat-haiku-4-5",
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name: "GitLab Duo Claude Haiku 4.5",
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reasoning: false,
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input: ["text"],
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cost: { input: 1, output: 5, cacheRead: 0.1, cacheWrite: 1.25 },
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contextWindow: 200000,
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maxTokens: 8192,
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},
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// OpenAI models
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{
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id: "duo-chat-gpt-5-1",
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name: "GitLab Duo GPT-5.1",
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reasoning: false,
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input: ["text"],
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cost: { input: 2.5, output: 10, cacheRead: 0, cacheWrite: 0 },
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contextWindow: 128000,
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maxTokens: 16384,
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},
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{
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id: "duo-chat-gpt-5-mini",
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name: "GitLab Duo GPT-5 Mini",
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reasoning: false,
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input: ["text"],
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cost: { input: 0.15, output: 0.6, cacheRead: 0, cacheWrite: 0 },
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contextWindow: 128000,
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maxTokens: 16384,
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},
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{
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id: "duo-chat-gpt-5-codex",
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name: "GitLab Duo GPT-5 Codex",
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reasoning: false,
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input: ["text"],
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cost: { input: 2.5, output: 10, cacheRead: 0, cacheWrite: 0 },
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contextWindow: 128000,
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maxTokens: 16384,
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},
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],
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oauth: {
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name: "GitLab Duo",
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login: loginGitLab,
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refreshToken: refreshGitLabToken,
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getApiKey: (cred) => cred.access,
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},
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streamSimple: streamGitLabDuo,
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});
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}
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