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add changes needed for SAP Generative AI Hub
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,114 @@ | ||
| import { ModelProvider } from "../.."; | ||
| import OpenAI from "./OpenAI"; | ||
|
|
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| class SAPGenAIHub extends OpenAI { | ||
| private tokenCache: { token: string; expiry: number } | null = null; | ||
|
|
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| static providerName: ModelProvider = "sap-gen-ai-hub"; | ||
|
|
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| private _getTokenParams(): { authURL: string; clientID: string; clientSecret: string } { | ||
| if (!this.authURL || !this.clientID || !this.clientSecret) { | ||
| throw new Error("Authentication parameters (authURL, clientID, clientSecret) are undefined"); | ||
| } | ||
| return { | ||
| authURL: this.authURL.endsWith("/oauth/token") ? this.authURL : `${this.authURL}/oauth/token`, | ||
| clientID: this.clientID, | ||
| clientSecret: this.clientSecret, | ||
| }; | ||
| } | ||
|
|
||
| private async fetchWithTimeout(url: string, options: RequestInit, timeout: number): Promise<Response> { | ||
| return new Promise((resolve, reject) => { | ||
| const timer = setTimeout(() => reject(new Error('Request timed out')), timeout); | ||
|
|
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| fetch(url, options) | ||
| .then(response => { | ||
| clearTimeout(timer); | ||
| resolve(response); | ||
| }) | ||
| .catch(err => { | ||
| clearTimeout(timer); | ||
| reject(err); | ||
| }); | ||
| }); | ||
| } | ||
|
|
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| private async fetchOAuthToken(): Promise<string> { | ||
| const params = this._getTokenParams(); | ||
| const response = await this.fetchWithTimeout(params.authURL, { | ||
| method: 'POST', | ||
| headers: { 'Content-Type': 'application/x-www-form-urlencoded' }, | ||
| body: new URLSearchParams({ | ||
| client_id: params.clientID, | ||
| client_secret: params.clientSecret, | ||
| grant_type: 'client_credentials', | ||
| }).toString(), | ||
| }, 10000); // 10-second timeout | ||
|
|
||
| const data = await response.json(); | ||
| return data.access_token; | ||
| } | ||
|
|
||
| private async ensureToken(): Promise<void> { | ||
| if (!this.tokenCache || Date.now() >= this.tokenCache.expiry) { | ||
| const token = await this.fetchOAuthToken(); | ||
| const expiry = Date.now() + 3600 * 1000; // Consider making this configurable | ||
| this.tokenCache = { token, expiry }; | ||
| } | ||
| } | ||
|
|
||
| protected async _getRequestHeaders(): Promise<Record<string, string>> { | ||
| await this.ensureToken(); | ||
| const header: Record<string, string> = { | ||
| "Content-Type": "application/json", | ||
| Authorization: `Bearer ${this.tokenCache?.token}`, | ||
| "api-key": this.apiKey || "", | ||
| "AI-Resource-Group": this.resourceGroup || "default", | ||
| }; | ||
| return header; | ||
| } | ||
|
|
||
| protected _getChatUrl() { | ||
| if (this.apiType === "azure") { | ||
| return `${this.apiBase}/chat/completions?api-version=${this.apiVersion}`; | ||
| } else { | ||
| let url = this.apiBase; | ||
| if (!url) { | ||
| throw new Error( | ||
| "No API base URL provided. Please set the 'apiBase' option in config.json" | ||
| ); | ||
| } | ||
| if (url.endsWith("/")) { | ||
| url = url.slice(0, -1); | ||
| } | ||
|
|
||
| if (!url.endsWith("/v1")) { | ||
| url += "/v1"; | ||
| } | ||
| return url + "/chat/completions"; | ||
| } | ||
| } | ||
|
|
||
| protected _getCompletionUrl() { | ||
| if (this.apiType === "azure") { | ||
| return `${this.apiBase}/completions?api-version=${this.apiVersion}`; | ||
| } else { | ||
| let url = this.apiBase; | ||
| if (!url) { | ||
| throw new Error( | ||
| "No API base URL provided. Please set the 'apiBase' option in config.json" | ||
| ); | ||
| } | ||
| if (url.endsWith("/")) { | ||
| url = url.slice(0, -1); | ||
| } | ||
| if (!url.endsWith("/v1")) { | ||
| url += "/v1"; | ||
| } | ||
| return url + "/completions"; | ||
| } | ||
| } | ||
|
|
||
| } | ||
|
|
||
| export default SAPGenAIHub; |
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