nanochat/services/frontend/hooks/useSSE.ts
Manmohan Sharma aa7a907063
feat(frontend): wire frontend to real backend auth + chat-api services
Remove NextAuth and replace with token-based auth against the backend
auth service (OAuth + JWT). The frontend now redirects login to
/api/auth/google and /api/auth/github (proxied by nginx to the auth
service), captures the JWT from the redirect query param, and uses it
for all API calls.

Key changes:
- Remove next-auth dependency and all NextAuth config/routes
- Add lib/auth-client.ts (JWT token storage + auth headers)
- Add hooks/useAuth.ts (client-side auth state + token capture)
- Rewrite middleware.ts to pass-through (client-side auth only)
- Login page uses plain <a> links to /api/auth/{provider}
- Chat page captures access_token from OAuth redirect
- Zustand store fetches conversations from real chat-api via JWT
- API routes proxy /api/conversations/* to chat-api with auth
- chat/stream route supports conversationId + auth header forwarding
- useSSE hook accepts auth headers for authenticated streaming
- Sidebar loads conversations from API, supports delete
- Landing page (Hero, LandingNav) uses useAuth instead of useSession
- Add .env.production.example and scripts/generate-jwt-keys.sh

Mock echo fallback preserved when CHAT_API_URL is not set.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-04-16 13:21:38 -07:00

107 lines
2.9 KiB
TypeScript

'use client';
import { useCallback, useRef, useState } from 'react';
export interface SSEOptions {
onToken?: (token: string, gpu?: number) => void;
onDone?: () => void;
onError?: (err: Error) => void;
}
export interface StreamRequest {
messages: Array<{ role: string; content: string }>;
model?: string;
temperature?: number;
topK?: number;
conversationId?: string;
auth?: Record<string, string>;
}
export function useSSE(endpoint: string, options: SSEOptions = {}) {
const [isStreaming, setIsStreaming] = useState(false);
const abortRef = useRef<AbortController | null>(null);
const stop = useCallback(() => {
abortRef.current?.abort();
abortRef.current = null;
setIsStreaming(false);
}, []);
const start = useCallback(
async (body: StreamRequest) => {
stop();
const ac = new AbortController();
abortRef.current = ac;
setIsStreaming(true);
try {
const headers: Record<string, string> = { 'Content-Type': 'application/json' };
if (body.auth) {
Object.assign(headers, body.auth);
}
const res = await fetch(endpoint, {
method: 'POST',
headers,
body: JSON.stringify({
messages: body.messages,
model: body.model,
temperature: body.temperature,
topK: body.topK,
conversationId: body.conversationId,
}),
signal: ac.signal,
});
if (!res.ok || !res.body) {
throw new Error(`HTTP ${res.status}`);
}
const reader = res.body.getReader();
const decoder = new TextDecoder();
let buffer = '';
while (true) {
const { done, value } = await reader.read();
if (done) break;
buffer += decoder.decode(value, { stream: true });
let nl: number;
while ((nl = buffer.indexOf('\n')) !== -1) {
const line = buffer.slice(0, nl).trim();
buffer = buffer.slice(nl + 1);
if (!line.startsWith('data:')) continue;
const payload = line.slice(5).trim();
if (!payload) continue;
try {
const data = JSON.parse(payload);
if (data.done) {
options.onDone?.();
setIsStreaming(false);
return;
}
if (typeof data.token === 'string') {
options.onToken?.(data.token, data.gpu);
}
} catch {
/* swallow malformed chunks */
}
}
}
options.onDone?.();
} catch (err) {
if ((err as Error).name !== 'AbortError') {
options.onError?.(err as Error);
}
} finally {
setIsStreaming(false);
abortRef.current = null;
}
},
[endpoint, options, stop],
);
return { start, stop, isStreaming };
}