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app.py

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+import uvicorn
+from fastapi import FastAPI, Depends
+from starlette.responses import RedirectResponse
+from starlette.middleware.sessions import SessionMiddleware
+from authlib.integrations.starlette_client import OAuth, OAuthError
+from fastapi import Request
+import os
+from starlette.config import Config
+import gradio as gr
+
+app = FastAPI()
+
+# OAuth settings
+GOOGLE_CLIENT_ID = "687634210515-r86aagm0mse8qeq2fhi0t6atd0o1gln5.apps.googleusercontent.com" #os.environ.get("GOOGLE_CLIENT_ID")
+GOOGLE_CLIENT_SECRET = "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" #os.environ.get("GOOGLE_CLIENT_SECRET")
+SECRET_KEY = "3fc4jb0ohuBuFGWxohXspsCuxXaF" #os.environ.get("SECRET_KEY")
+
+# Set up OAuth
+config_data = {'GOOGLE_CLIENT_ID': GOOGLE_CLIENT_ID, 'GOOGLE_CLIENT_SECRET': GOOGLE_CLIENT_SECRET}
+starlette_config = Config(environ=config_data)
+oauth = OAuth(starlette_config)
+oauth.register(
+    name='google',
+    server_metadata_url='https://accounts.google.com/.well-known/openid-configuration',
+    client_kwargs={'scope': 'openid email profile'},
+)
+
+app.add_middleware(SessionMiddleware, secret_key=SECRET_KEY)
+
+# Dependency to get the current user
+def get_user(request: Request):
+    user = request.session.get('user')
+    if user:
+        return user['name']
+    return None
+
+@app.get('/')
+def public(request: Request, user = Depends(get_user)):
+    root_url = gr.route_utils.get_root_url(request, "/", None)
+    if user:
+        return RedirectResponse(url=f'{root_url}/gradio/')
+    else:
+        return RedirectResponse(url=f'{root_url}/main/')
+
+@app.route('/logout')
+async def logout(request: Request):
+    request.session.pop('user', None)
+    return RedirectResponse(url='/')
+
+@app.route('/login')
+async def login(request: Request):
+    root_url = gr.route_utils.get_root_url(request, "/login", None)
+    # redirect_uri = f"{root_url}/auth"
+    redirect_uri = "https://www.google.com"
+    
+    print("Redirecting to", redirect_uri)
+    return await oauth.google.authorize_redirect(request, redirect_uri)
+
+@app.route('/auth')
+async def auth(request: Request):
+    try:
+        access_token = await oauth.google.authorize_access_token(request)
+    except OAuthError:
+        print("Error getting access token", str(OAuthError))
+        return RedirectResponse(url='/')
+    request.session['user'] = dict(access_token)["userinfo"]
+    print("Redirecting to /gradio")
+    return RedirectResponse(url='/gradio')
+
+with gr.Blocks() as login_demo:
+    btn = gr.Button("Login with Google")
+    _js_redirect = """
+    () => {
+        url = '/login' + window.location.search;
+        window.open(url);
+    }
+    """
+    btn.click(None, js=_js_redirect)
+
+app = gr.mount_gradio_app(app, login_demo, path="/main")
+
+def greet(request: gr.Request):
+    return f"Welcome to Gradio, {request.username}"
+
+with gr.Blocks() as main_demo:
+    m = gr.Markdown("Welcome to Gradio!")
+    gr.Button("Logout", link="/logout")
+    main_demo.load(greet, None, m)
+
+app = gr.mount_gradio_app(app, main_demo, path="/gradio", auth_dependency=get_user)
+
+
+if __name__ == '__main__':
+    uvicorn.run(app)

start.py

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+import subprocess
+
+subprocess.run("uvicorn app:app --host 0.0.0.0 --port 7860", shell=True)