feat: add OAuth authentication support for HTTP MCP servers #18
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Owner
|
Thank you for the PR. Do you have an MCP server i could use to test? Especially how this work with an LLM using the cli |
Add support for OAuth 2.0 authentication with PKCE for HTTP-based MCP
servers that require authorization.
Features:
- OAuth 2.0 Authorization Code flow with PKCE (RFC 7636)
- Dynamic client registration support
- Persistent token storage in ~/.config/mcp/oauth_tokens.json
- Automatic token refresh using refresh tokens
- Local callback server for OAuth redirects (port 80 by default)
- Browser-based authorization flow
Usage:
Add "oauth": true to HTTP server config:
```json
{
"mcpServers": {
"my-server": {
"url": "https://example.com/mcp",
"oauth": true
}
}
}
```
On first connection, the browser opens for authorization. Tokens are
cached for subsequent connections.
New files:
- src/auth/token-storage.ts - Persistent OAuth token storage
- src/auth/callback-server.ts - Local HTTP server for OAuth callbacks
- src/auth/oauth-provider.ts - OAuthClientProvider implementation
- src/auth/index.ts - Re-exports
Modified files:
- src/config.ts - Added OAuthConfig type and oauth field
- src/client.ts - Added OAuth support for HTTP transports
- src/index.ts - Updated help text with OAuth documentation
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Author
https://github.com/bvolpato/mcp-server-oauth-toy Deployed to https://mcp-server-oauth-toy.brunovolpato.com/mcp So just add {
"mcpServers": {
"oauth-toy": {
"url": "https://mcp-server-oauth-toy.brunovolpato.com/mcp",
"oauth": true
}
}
}And give that a try mcp-cli oauth-toy/whoami '{}' |
- Make redirectUrl getter use actual port from callback server - Update clientMetadata to dynamically resolve redirect_uris - Fixes OAuth flow when port 80 is unavailable (common on macOS/Linux)
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Summary
This PR adds OAuth 2.0 authentication support for HTTP-based MCP servers that require authorization.
~/.config/mcp/oauth_tokens.jsonfor reuse across sessionsUsage
Add
"oauth": trueto any HTTP server configuration:{ "mcpServers": { "my-server": { "url": "https://example.com/mcp", "oauth": true } } }On first connection, the browser opens for authorization. Tokens are cached for subsequent connections.
New Files
src/auth/token-storage.ts- Persistent OAuth token storagesrc/auth/callback-server.ts- Local HTTP server for OAuth callbackssrc/auth/oauth-provider.ts- OAuthClientProvider implementation for the MCP SDKsrc/auth/index.ts- Re-exportsModified Files
src/config.ts- AddedOAuthConfigtype andoauthfield toHttpServerConfigsrc/client.ts- Added OAuth support for HTTP transports with proper flow handlingsrc/index.ts- Updated help text with OAuth documentationTest plan
bun run lint)bun run typecheck)bun test)