add support for token provider

src/azure.ts

@@ -3,7 +3,6 @@ import * as Errors from './error';
 import { FinalRequestOptions } from './internal/request-options';
 import { isObj, readEnv } from './internal/utils';
 import { ClientOptions, OpenAI } from './client';
-import { buildHeaders, NullableHeaders } from './internal/headers';
 
 /** API Client for interfacing with the Azure OpenAI API. */
 export interface AzureClientOptions extends ClientOptions {
@@ -37,7 +36,6 @@ export interface AzureClientOptions extends ClientOptions {
 
 /** API Client for interfacing with the Azure OpenAI API. */
 export class AzureOpenAI extends OpenAI {
-  private _azureADTokenProvider: (() => Promise<string>) | undefined;
   deploymentName: string | undefined;
   apiVersion: string = '';
 
@@ -90,9 +88,6 @@ export class AzureOpenAI extends OpenAI {
       );
     }
 
-    // define a sentinel value to avoid any typing issues
-    apiKey ??= API_KEY_SENTINEL;
-
     opts.defaultQuery = { ...opts.defaultQuery, 'api-version': apiVersion };
 
     if (!baseURL) {
@@ -116,11 +111,12 @@ export class AzureOpenAI extends OpenAI {
     super({
       apiKey,
       baseURL,
+      tokenProvider:
+        !azureADTokenProvider ? undefined : async () => ({ token: await azureADTokenProvider() }),
       ...opts,
       ...(dangerouslyAllowBrowser !== undefined ? { dangerouslyAllowBrowser } : {}),
     });
 
-    this._azureADTokenProvider = azureADTokenProvider;
     this.apiVersion = apiVersion;
     this.deploymentName = deployment;
   }
@@ -140,47 +136,6 @@ export class AzureOpenAI extends OpenAI {
     }
     return super.buildRequest(options, props);
   }
-
-  async _getAzureADToken(): Promise<string | undefined> {
-    if (typeof this._azureADTokenProvider === 'function') {
-      const token = await this._azureADTokenProvider();
-      if (!token || typeof token !== 'string') {
-        throw new Errors.OpenAIError(
-          `Expected 'azureADTokenProvider' argument to return a string but it returned ${token}`,
-        );
-      }
-      return token;
-    }
-    return undefined;
-  }
-
-  protected override async authHeaders(opts: FinalRequestOptions): Promise<NullableHeaders | undefined> {
-    return;
-  }
-
-  protected override async prepareOptions(opts: FinalRequestOptions): Promise<void> {
-    opts.headers = buildHeaders([opts.headers]);
-
-    /**
-     * The user should provide a bearer token provider if they want
-     * to use Azure AD authentication. The user shouldn't set the
-     * Authorization header manually because the header is overwritten
-     * with the Azure AD token if a bearer token provider is provided.
-     */
-    if (opts.headers.values.get('Authorization') || opts.headers.values.get('api-key')) {
-      return super.prepareOptions(opts);
-    }
-
-    const token = await this._getAzureADToken();
-    if (token) {
-      opts.headers.values.set('Authorization', `Bearer ${token}`);
-    } else if (this.apiKey !== API_KEY_SENTINEL) {
-      opts.headers.values.set('api-key', this.apiKey);
-    } else {
-      throw new Errors.OpenAIError('Unable to handle auth');
-    }
-    return super.prepareOptions(opts);
-  }
 }
 
 const _deployments_endpoints = new Set([
@@ -194,5 +149,3 @@ const _deployments_endpoints = new Set([
   '/batches',
   '/images/edits',
 ]);
-
-const API_KEY_SENTINEL = '<Missing Key>';

src/beta/realtime/websocket.ts

@@ -94,20 +94,24 @@ export class OpenAIRealtimeWebSocket extends OpenAIRealtimeEmitter {
     }
   }
 
+  static async create(
+    client: Pick<OpenAI, 'apiKey' | 'baseURL' | '_setToken'>,
+    props: { model: string; dangerouslyAllowBrowser?: boolean },
+  ): Promise<OpenAIRealtimeWebSocket> {
+    await client._setToken();
+    return new OpenAIRealtimeWebSocket(props, client);
+  }
+
   static async azure(
-    client: Pick<AzureOpenAI, '_getAzureADToken' | 'apiVersion' | 'apiKey' | 'baseURL' | 'deploymentName'>,
+    client: Pick<AzureOpenAI, '_setToken' | 'apiVersion' | 'apiKey' | 'baseURL' | 'deploymentName'>,
     options: { deploymentName?: string; dangerouslyAllowBrowser?: boolean } = {},
   ): Promise<OpenAIRealtimeWebSocket> {
-    const token = await client._getAzureADToken();
+    const isToken = await client._setToken();
     function onURL(url: URL) {
-      if (client.apiKey !== '<Missing Key>') {
-        url.searchParams.set('api-key', client.apiKey);
+      if (isToken) {
+        url.searchParams.set('Authorization', `Bearer ${client.apiKey}`);
       } else {
-        if (token) {
-          url.searchParams.set('Authorization', `Bearer ${token}`);
-        } else {
-          throw new Error('AzureOpenAI is not instantiated correctly. No API key or token provided.');
-        }
+        url.searchParams.set('api-key', client.apiKey);
       }
     }
     const deploymentName = options.deploymentName ?? client.deploymentName;

src/beta/realtime/ws.ts

@@ -51,8 +51,16 @@ export class OpenAIRealtimeWS extends OpenAIRealtimeEmitter {
     });
   }
 
+  static async create(
+    client: Pick<OpenAI, 'apiKey' | 'baseURL' | '_setToken'>,
+    props: { model: string; options?: WS.ClientOptions | undefined },
+  ): Promise<OpenAIRealtimeWS> {
+    await client._setToken();
+    return new OpenAIRealtimeWS(props, client);
+  }
+
   static async azure(
-    client: Pick<AzureOpenAI, '_getAzureADToken' | 'apiVersion' | 'apiKey' | 'baseURL' | 'deploymentName'>,
+    client: Pick<AzureOpenAI, '_setToken' | 'apiVersion' | 'apiKey' | 'baseURL' | 'deploymentName'>,
     options: { deploymentName?: string; options?: WS.ClientOptions | undefined } = {},
   ): Promise<OpenAIRealtimeWS> {
     const deploymentName = options.deploymentName ?? client.deploymentName;
@@ -82,15 +90,11 @@ export class OpenAIRealtimeWS extends OpenAIRealtimeEmitter {
   }
 }
 
-async function getAzureHeaders(client: Pick<AzureOpenAI, '_getAzureADToken' | 'apiKey'>) {
-  if (client.apiKey !== '<Missing Key>') {
-    return { 'api-key': client.apiKey };
+async function getAzureHeaders(client: Pick<AzureOpenAI, '_setToken' | 'apiKey'>) {
+  const isToken = await client._setToken();
+  if (isToken) {
+    return { Authorization: `Bearer ${isToken}` };
   } else {
-    const token = await client._getAzureADToken();
-    if (token) {
-      return { Authorization: `Bearer ${token}` };
-    } else {
-      throw new Error('AzureOpenAI is not instantiated correctly. No API key or token provided.');
-    }
+    return { 'api-key': client.apiKey };
   }
 }

src/client.ts

@@ -191,12 +191,20 @@ import {
 } from './internal/utils/log';
 import { isEmptyObj } from './internal/utils/values';
 
+export interface AccessToken {
+  token: string;
+}
+export type TokenProvider = () => Promise<AccessToken>;
+
 export interface ClientOptions {
   /**
    * Defaults to process.env['OPENAI_API_KEY'].
    */
   apiKey?: string | undefined;
-
+  /**
+   * A function that returns a token to use for authentication.
+   */
+  tokenProvider?: TokenProvider | undefined;
   /**
    * Defaults to process.env['OPENAI_ORG_ID'].
    */
@@ -307,6 +315,7 @@ export class OpenAI {
   #encoder: Opts.RequestEncoder;
   protected idempotencyHeader?: string;
   private _options: ClientOptions;
+  private _tokenProvider: TokenProvider | undefined;
 
   /**
    * API Client for interfacing with the OpenAI API.
@@ -330,11 +339,18 @@ export class OpenAI {
     organization = readEnv('OPENAI_ORG_ID') ?? null,
     project = readEnv('OPENAI_PROJECT_ID') ?? null,
     webhookSecret = readEnv('OPENAI_WEBHOOK_SECRET') ?? null,
+    tokenProvider,
     ...opts
   }: ClientOptions = {}) {
-    if (apiKey === undefined) {
+    if (apiKey === undefined && !tokenProvider) {
+      throw new Errors.OpenAIError(
+        'Missing credentials. Please pass one of `apiKey` and `tokenProvider`, or set the `OPENAI_API_KEY` environment variable.',
+      );
+    }
+
+    if (tokenProvider && apiKey) {
       throw new Errors.OpenAIError(
-        "The OPENAI_API_KEY environment variable is missing or empty; either provide it, or instantiate the OpenAI client with an apiKey option, like new OpenAI({ apiKey: 'My API Key' }).",
+        'The `apiKey` and `tokenProvider` arguments are mutually exclusive; only one can be passed at a time.',
       );
     }
 
@@ -343,6 +359,7 @@ export class OpenAI {
       organization,
       project,
       webhookSecret,
+      tokenProvider,
       ...opts,
       baseURL: baseURL || `https://api.openai.com/v1`,
     };
@@ -370,7 +387,8 @@ export class OpenAI {
 
     this._options = options;
 
-    this.apiKey = apiKey;
+    this.apiKey = apiKey ?? 'Missing Key';
+    this._tokenProvider = tokenProvider;
     this.organization = organization;
     this.project = project;
     this.webhookSecret = webhookSecret;
@@ -390,6 +408,7 @@ export class OpenAI {
       fetch: this.fetch,
       fetchOptions: this.fetchOptions,
       apiKey: this.apiKey,
+      tokenProvider: this._tokenProvider,
       organization: this.organization,
       project: this.project,
       webhookSecret: this.webhookSecret,
@@ -438,6 +457,31 @@ export class OpenAI {
     return Errors.APIError.generate(status, error, message, headers);
   }
 
+  async _setToken(): Promise<boolean> {
+    if (typeof this._tokenProvider === 'function') {
+      try {
+        const token = await this._tokenProvider();
+        if (!token || typeof token.token !== 'string') {
+          throw new Errors.OpenAIError(
+            `Expected 'tokenProvider' argument to return a string but it returned ${token}`,
+          );
+        }
+        this.apiKey = token.token;
+        return true;
+      } catch (err: any) {
+        if (err instanceof Errors.OpenAIError) {
+          throw err;
+        }
+        throw new Errors.OpenAIError(
+          `Failed to get token from 'tokenProvider' function: ${err.message}`,
+          // @ts-ignore
+          { cause: err },
+        );
+      }
+    }
+    return false;
+  }
+
   buildURL(
     path: string,
     query: Record<string, unknown> | null | undefined,
@@ -464,7 +508,9 @@ export class OpenAI {
   /**
    * Used as a callback for mutating the given `FinalRequestOptions` object.
    */
-  protected async prepareOptions(options: FinalRequestOptions): Promise<void> {}
+  protected async prepareOptions(options: FinalRequestOptions): Promise<void> {
+    await this._setToken();
+  }
 
   /**
    * Used as a callback for mutating the given `RequestInit` object.

tests/index.test.ts

@@ -719,4 +719,96 @@ describe('retries', () => {
     ).toEqual(JSON.stringify({ a: 1 }));
     expect(count).toEqual(3);
   });
+
+  describe('auth', () => {
+    test('apiKey', async () => {
+      const client = new OpenAI({
+        baseURL: 'http://localhost:5000/',
+        apiKey: 'My API Key',
+      });
+      const { req } = await client.buildRequest({ path: '/foo', method: 'get' });
+      expect(req.headers.get('authorization')).toEqual('Bearer My API Key');
+    });
+
+    test('token', async () => {
+      const testFetch = async (url: any, { headers }: RequestInit = {}): Promise<Response> => {
+        return new Response(JSON.stringify({}), { headers: headers ?? [] });
+      };
+      const client = new OpenAI({
+        baseURL: 'http://localhost:5000/',
+        tokenProvider: async () => ({ token: 'my token' }),
+        fetch: testFetch,
+      });
+      expect(
+        (await client.request({ method: 'post', path: 'https://example.com' }).asResponse()).headers.get(
+          'authorization',
+        ),
+      ).toEqual('Bearer my token');
+    });
+
+    test('token is refreshed', async () => {
+      let fail = true;
+      const testFetch = async (url: any, { headers }: RequestInit = {}): Promise<Response> => {
+        if (fail) {
+          fail = false;
+          return new Response(undefined, {
+            status: 429,
+            headers: {
+              'Retry-After': '0.1',
+            },
+          });
+        }
+        return new Response(JSON.stringify({}), {
+          headers: headers ?? [],
+        });
+      };
+      let counter = 0;
+      async function tokenProvider() {
+        return { token: `token-${counter++}` };
+      }
+      const client = new OpenAI({
+        baseURL: 'http://localhost:5000/',
+        tokenProvider,
+        fetch: testFetch,
+      });
+      expect(
+        (
+          await client.chat.completions
+            .create({
+              model: '',
+              messages: [{ role: 'system', content: 'Hello' }],
+            })
+            .asResponse()
+        ).headers.get('authorization'),
+      ).toEqual('Bearer token-1');
+    });
+
+    test('mutual exclusive', () => {
+      try {
+        new OpenAI({
+          baseURL: 'http://localhost:5000/',
+          tokenProvider: async () => ({ token: 'my token' }),
+          apiKey: 'my api key',
+        });
+      } catch (error: any) {
+        expect(error).toBeInstanceOf(Error);
+        expect(error.message).toEqual(
+          'The `apiKey` and `tokenProvider` arguments are mutually exclusive; only one can be passed at a time.',
+        );
+      }
+    });
+
+    test('at least one', () => {
+      try {
+        new OpenAI({
+          baseURL: 'http://localhost:5000/',
+        });
+      } catch (error: any) {
+        expect(error).toBeInstanceOf(Error);
+        expect(error.message).toEqual(
+          'Missing credentials. Please pass one of `apiKey` and `tokenProvider`, or set the `OPENAI_API_KEY` environment variable.',
+        );
+      }
+    });
+  });
 });