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2170658 548dfc9 2170658 a980424 2170658 a980424 2170658 a980424 2170658 f3ab5f0 a980424 f3ab5f0 2170658 548dfc9 2170658 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 | from __future__ import annotations
import time
from typing import Optional
from fastapi import APIRouter, Depends, HTTPException, status
from app.core.logger import get_logger
from app.models.schemas import (
GoogleOAuthAuthUrlRequest,
GoogleOAuthAuthUrlResponse,
GoogleOAuthCallbackRequest,
GoogleOAuthCallbackResponse,
GoogleOAuthRefreshRequest,
GoogleOAuthTokenResponse,
GoogleOAuthVerifyRequest,
GoogleOAuthVerifyResponse,
)
from app.services.google_oauth_service import GoogleOAuthError, GoogleOAuthService
from app.services.google_scope_map import resolve_scope_list
from app.services.jwt_service import JWTService
from app.config import get_settings
router = APIRouter(prefix="/google/oauth", tags=["Google OAuth"])
_logger = get_logger(__name__)
_settings = get_settings()
_jwt_service = JWTService()
_oauth_service = GoogleOAuthService()
def get_oauth_service() -> GoogleOAuthService:
return _oauth_service
async def close_oauth_service() -> None:
await _oauth_service.close()
def _generate_state() -> str:
result = _jwt_service.generate(
subject="google-oauth-state",
secret=_settings.jwt_secret_key,
expiry_minutes=_settings.google_oauth_state_ttl_minutes,
)
return result["token"]
def _verify_state(state: str) -> bool:
return _jwt_service.validate(
state, secret=_settings.jwt_secret_key
)["valid"]
def _http_error(exc: GoogleOAuthError) -> HTTPException:
return HTTPException(status_code=exc.status_code, detail=exc.message)
@router.post("/auth-url", response_model=GoogleOAuthAuthUrlResponse,
summary="Generate a Google OAuth authorization URL (Step 1)")
async def create_auth_url(
body: GoogleOAuthAuthUrlRequest,
service: GoogleOAuthService = Depends(get_oauth_service),
):
start = time.perf_counter()
resolved_scopes, scope_errors, dropped_scopes = resolve_scope_list(body.scopes)
if scope_errors:
raise HTTPException(
status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
detail="; ".join(scope_errors),
)
state = _generate_state()
auth_url = service.build_auth_url(
client_id=body.client_id,
redirect_uri=body.redirect_uri,
state=state,
scope=" ".join(resolved_scopes),
prompt=body.prompt,
access_type=body.access_type,
login_hint=body.login_hint,
include_granted_scopes=body.include_granted_scopes,
)
_logger.info(
"Generated Google OAuth auth URL for client '%s...' (%.2fms)",
body.client_id[:8],
(time.perf_counter() - start) * 1000,
)
return GoogleOAuthAuthUrlResponse(
success=True,
auth_url=auth_url,
state=state,
resolved_scopes=resolved_scopes,
dropped_scopes=dropped_scopes,
)
@router.post("/callback", response_model=GoogleOAuthTokenResponse,
summary="Exchange the authorization code for tokens (Step 2)")
async def oauth_callback(
body: GoogleOAuthCallbackRequest,
service: GoogleOAuthService = Depends(get_oauth_service),
):
start = time.perf_counter()
if not _verify_state(body.state):
raise HTTPException(
status_code=status.HTTP_403_FORBIDDEN,
detail="Invalid or expired state token. Possible CSRF attack.",
)
try:
tokens = await service.exchange_code(
client_id=body.client_id,
client_secret=body.client_secret,
code=body.code,
redirect_uri=body.redirect_uri,
)
except GoogleOAuthError as exc:
raise _http_error(exc) from exc
id_token_raw: Optional[str] = tokens.get("id_token")
user = None
if id_token_raw:
try:
user = await service.verify_id_token(id_token_raw, body.client_id)
except GoogleOAuthError as exc:
raise _http_error(exc) from exc
_logger.info(
"Google OAuth callback completed for client '%s...' (%.2fms)",
body.client_id[:8],
(time.perf_counter() - start) * 1000,
)
return GoogleOAuthTokenResponse(
success=True,
access_token=tokens["access_token"],
expires_in=int(tokens.get("expires_in", 0)),
refresh_token=tokens.get("refresh_token"),
id_token=id_token_raw,
token_type=tokens.get("token_type", "Bearer"),
scope=tokens.get("scope"),
user=user,
)
@router.get("/callback", response_model=GoogleOAuthCallbackResponse,
summary="Capture the data Google returns after the user authorizes (browser redirect)")
async def oauth_callback_redirect(
state: Optional[str] = None,
code: Optional[str] = None,
error: Optional[str] = None,
error_description: Optional[str] = None,
scope: Optional[str] = None,
authuser: Optional[str] = None,
prompt: Optional[str] = None,
):
"""Handle the browser redirect Google sends to ``redirect_uri``.
Captures the data Google returns after authentication — ``code`` on
success, or ``error``/``error_description`` when access is denied — and
returns it so the client can exchange the code via ``POST /callback``.
"""
start = time.perf_counter()
if not state:
raise HTTPException(
status_code=status.HTTP_400_BAD_REQUEST,
detail="Missing 'state' parameter in the OAuth callback.",
)
if not _verify_state(state):
raise HTTPException(
status_code=status.HTTP_403_FORBIDDEN,
detail="Invalid or expired state token. Possible CSRF attack.",
)
_logger.info(
"Google OAuth callback captured data for state '%s...' (%.2fms)",
state[:12],
(time.perf_counter() - start) * 1000,
)
return GoogleOAuthCallbackResponse(
success=error is None,
state=state,
code=code,
error=error,
error_description=error_description,
scope=scope,
authuser=authuser,
prompt=prompt,
message=(
"Authorization successful. Exchange the code via POST /google/oauth/callback."
if error is None
else f"Authorization failed: {error}."
+ (f" {error_description}" if error_description else "")
),
)
@router.post("/refresh", response_model=GoogleOAuthTokenResponse,
summary="Refresh an expired access token (Step 3)")
async def refresh_token(
body: GoogleOAuthRefreshRequest,
service: GoogleOAuthService = Depends(get_oauth_service),
):
start = time.perf_counter()
try:
tokens = await service.refresh_access_token(
client_id=body.client_id,
client_secret=body.client_secret,
refresh_token=body.refresh_token,
)
except GoogleOAuthError as exc:
raise _http_error(exc) from exc
id_token_raw: Optional[str] = tokens.get("id_token")
user = None
if id_token_raw:
try:
user = await service.verify_id_token(id_token_raw, body.client_id)
except GoogleOAuthError as exc:
raise _http_error(exc) from exc
_logger.info(
"Google OAuth token refresh completed for client '%s...' (%.2fms)",
body.client_id[:8],
(time.perf_counter() - start) * 1000,
)
return GoogleOAuthTokenResponse(
success=True,
access_token=tokens["access_token"],
expires_in=int(tokens.get("expires_in", 0)),
refresh_token=body.refresh_token,
id_token=id_token_raw,
token_type=tokens.get("token_type", "Bearer"),
scope=tokens.get("scope"),
user=user,
)
@router.post("/verify", response_model=GoogleOAuthVerifyResponse,
summary="Verify a Google ID token and return the user profile")
async def verify_id_token(
body: GoogleOAuthVerifyRequest,
service: GoogleOAuthService = Depends(get_oauth_service),
):
start = time.perf_counter()
try:
user = await service.verify_id_token(body.id_token, body.client_id)
except GoogleOAuthError as exc:
raise _http_error(exc) from exc
_logger.info(
"Google OAuth ID token verified for client '%s...' (%.2fms)",
body.client_id[:8],
(time.perf_counter() - start) * 1000,
)
return GoogleOAuthVerifyResponse(success=True, valid=True, user=user)
|