Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 | 22x 22x 22x 22x 22x 22x 22x 17x 17x 1x 1x 16x 16x 8x 8x 6x 6x 2x 8x 8x 1x 1x 7x 1x 1x 6x 6x 1x 1x 5x 1x 1x 1x 4x 1x 1x 3x 1x 1x 2x 2x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 6x 6x 1x 1x 5x 5x 1x 1x 4x 4x 3x 3x 2x 2x 2x 1x 1x 1x 1x 1x 1x 1x 2x 2x 2x 2x 2x 2x 2x 14x 14x | /**
* OAuth Token Endpoint
*
* Handles token requests for:
* - authorization_code: Exchange authorization code for tokens
* - refresh_token: Refresh expired access tokens
*
* This endpoint issues MCP tokens (JWTs) to clients after successful
* GitLab authentication.
*/
import { Request, Response } from "express";
import { loadOAuthConfig, OAuthConfig } from "../config";
import { sessionStore } from "../session-store";
import {
verifyCodeChallenge,
createJWT,
generateRefreshToken,
calculateTokenExpiry,
isTokenExpiringSoon,
} from "../token-utils";
import { refreshGitLabToken } from "../gitlab-device-flow";
import { getBaseUrl } from "./metadata";
import { logger } from "../../logger";
import { MCPTokenResponse, OAuthErrorResponse, OAuthSession } from "../types";
/**
* Token endpoint handler
*
* Handles POST /token requests for token operations.
*
* Supported grant types:
* - authorization_code: Exchange code for tokens (requires code_verifier for PKCE)
* - refresh_token: Refresh access token
*/
export async function tokenHandler(req: Request, res: Response): Promise<void> {
const config = loadOAuthConfig();
if (!config) {
sendError(res, 500, "server_error", "OAuth not configured");
return;
}
const { grant_type } = req.body as { grant_type?: string };
switch (grant_type) {
case "authorization_code":
await handleAuthorizationCode(req, res, config);
break;
case "refresh_token":
await handleRefreshToken(req, res, config);
break;
default:
sendError(res, 400, "unsupported_grant_type", `Grant type "${grant_type}" is not supported`);
}
}
/**
* Handle authorization code grant
*
* Exchanges an authorization code for access and refresh tokens.
* Requires PKCE code_verifier to match the original code_challenge.
*/
async function handleAuthorizationCode(
req: Request,
res: Response,
config: OAuthConfig
): Promise<void> {
const { code, code_verifier, redirect_uri } = req.body as {
code?: string;
code_verifier?: string;
redirect_uri?: string;
};
// Validate required parameters
if (!code) {
sendError(res, 400, "invalid_request", "Missing authorization code");
return;
}
if (!code_verifier) {
sendError(res, 400, "invalid_request", "Missing code_verifier (PKCE required)");
return;
}
// Look up authorization code
const authCode = sessionStore.getAuthCode(code);
if (!authCode) {
sendError(res, 400, "invalid_grant", "Invalid or expired authorization code");
return;
}
// Check if code has expired
if (Date.now() > authCode.expiresAt) {
sessionStore.deleteAuthCode(code);
sendError(res, 400, "invalid_grant", "Authorization code has expired");
return;
}
// Verify PKCE code challenge
if (!verifyCodeChallenge(code_verifier, authCode.codeChallenge, authCode.codeChallengeMethod)) {
sendError(res, 400, "invalid_grant", "Invalid code_verifier");
return;
}
// Verify redirect_uri matches (if it was provided in authorization)
if (authCode.redirectUri && redirect_uri !== authCode.redirectUri) {
sendError(res, 400, "invalid_grant", "redirect_uri does not match");
return;
}
// Get the session created during device flow
const session = sessionStore.getSession(authCode.sessionId);
if (!session) {
sendError(res, 400, "invalid_grant", "Session not found");
return;
}
// Generate MCP tokens
const baseUrl = getBaseUrl(req);
const accessToken = createJWT(
{
iss: baseUrl,
sub: session.gitlabUserId.toString(),
aud: authCode.clientId,
sid: session.id,
scope: session.scopes.join(" "),
gitlab_user: session.gitlabUsername,
},
config.sessionSecret,
config.tokenTtl
);
const refreshToken = generateRefreshToken();
// Update session with MCP tokens
sessionStore.updateSession(session.id, {
mcpAccessToken: accessToken,
mcpRefreshToken: refreshToken,
mcpTokenExpiry: calculateTokenExpiry(config.tokenTtl),
});
// Delete authorization code (single use)
sessionStore.deleteAuthCode(code);
logger.info(
{
sessionId: session.id.substring(0, 8) + "...",
userId: session.gitlabUserId,
},
"MCP tokens issued via authorization_code grant"
);
// Return token response
const response: MCPTokenResponse = {
access_token: accessToken,
token_type: "Bearer",
expires_in: config.tokenTtl,
refresh_token: refreshToken,
scope: session.scopes.join(" "),
};
res.json(response);
}
/**
* Handle refresh token grant
*
* Issues new access and refresh tokens using a valid refresh token.
* Also refreshes the underlying GitLab token if needed.
*/
async function handleRefreshToken(req: Request, res: Response, config: OAuthConfig): Promise<void> {
const { refresh_token } = req.body as { refresh_token?: string };
if (!refresh_token) {
sendError(res, 400, "invalid_request", "Missing refresh_token");
return;
}
// Find session by refresh token
const session = sessionStore.getSessionByRefreshToken(refresh_token);
if (!session) {
sendError(res, 400, "invalid_grant", "Invalid refresh token");
return;
}
// Refresh GitLab token if it's expiring soon (5 minute buffer)
let updatedSession: OAuthSession = session;
if (isTokenExpiringSoon(session.gitlabTokenExpiry)) {
try {
const newTokens = await refreshGitLabToken(session.gitlabRefreshToken, config);
sessionStore.updateSession(session.id, {
gitlabAccessToken: newTokens.access_token,
gitlabRefreshToken: newTokens.refresh_token,
gitlabTokenExpiry: calculateTokenExpiry(newTokens.expires_in),
});
// Get updated session
const refreshedSession = sessionStore.getSession(session.id);
if (!refreshedSession) {
sendError(res, 400, "invalid_grant", "Session lost during refresh");
return;
}
updatedSession = refreshedSession;
logger.debug({ sessionId: session.id.substring(0, 8) + "..." }, "GitLab token refreshed");
} catch (error: unknown) {
logger.error({ err: error as Error }, "Failed to refresh GitLab token");
sendError(res, 400, "invalid_grant", "Failed to refresh underlying GitLab token");
return;
}
}
// Generate new MCP tokens
const baseUrl = getBaseUrl(req);
const accessToken = createJWT(
{
iss: baseUrl,
sub: updatedSession.gitlabUserId.toString(),
aud: updatedSession.clientId,
sid: updatedSession.id,
scope: updatedSession.scopes.join(" "),
gitlab_user: updatedSession.gitlabUsername,
},
config.sessionSecret,
config.tokenTtl
);
const newRefreshToken = generateRefreshToken();
// Update session with new MCP tokens
sessionStore.updateSession(updatedSession.id, {
mcpAccessToken: accessToken,
mcpRefreshToken: newRefreshToken,
mcpTokenExpiry: calculateTokenExpiry(config.tokenTtl),
});
logger.info(
{
sessionId: updatedSession.id.substring(0, 8) + "...",
userId: updatedSession.gitlabUserId,
},
"MCP tokens refreshed via refresh_token grant"
);
// Return token response
const response: MCPTokenResponse = {
access_token: accessToken,
token_type: "Bearer",
expires_in: config.tokenTtl,
refresh_token: newRefreshToken,
scope: updatedSession.scopes.join(" "),
};
res.json(response);
}
/**
* Send an OAuth error response
*/
function sendError(res: Response, status: number, error: string, description: string): void {
const response: OAuthErrorResponse = {
error,
error_description: description,
};
res.status(status).json(response);
}
|