MCP Servers

A collection of Model Context Protocol servers, templates, tools and more.

J
Just4mcps
by @Hraisikai
GitHub Repo(1 stars)

MCP server by Hraisikai

Created 3/1/2026
Updated about 21 hours ago
README
View Source
Repository documentation and setup instructions

Just4MCPs

An authenticated MCP (Model Context Protocol) gateway with role-based access control. Just4MCPs sits between your MCP clients (Claude Desktop, etc.) and your upstream MCP servers, providing centralized authentication via any OIDC-compliant identity provider and fine-grained tool-level permissions backed by SurrealDB.

Architecture

MCP Client (Claude Desktop, etc.)
  → Ingress (JWT validation via Keycloak JWKS)
    → FastAPI MCP Proxy (role extraction + tool ACL from SurrealDB)
      → Upstream MCP Server A
      → Upstream MCP Server B
      → ...

Features

  • OAuth2 + PKCE Authentication — works with any OIDC provider (Keycloak, Auth0, Okta, Azure AD, etc.) using a confidential client (secret stays server-side)
  • RFC 9728 / RFC 8414 OAuth Discovery — MCP clients can auto-discover the authorization server
  • Role-Based Access Control — per-group, per-tool permissions stored in SurrealDB
  • Per-User Credentials — encrypted credential storage for upstream MCP servers that need user-specific tokens
  • Admin Dashboard — web UI for managing MCP server registrations, tool permissions, and group access
  • MCP Protocol Proxy — transparent SSE/Streamable HTTP proxying to upstream servers
  • Hot-Reloadable Config — upstream servers can be added/removed at runtime through the admin UI

Prerequisites

  • An OIDC identity provider (Keycloak, Auth0, Okta, Azure AD, etc.) — for authentication
  • Docker & Docker Compose — for local development
  • Kubernetes cluster (k3s, k8s, etc.) — for production deployment
  • A container registry — to host your built images

Quick Start: Docker Compose

This is the fastest way to get a local development environment running.

1. Clone and configure

git clone <repo-url>
cd just4mcps/mcp-gateway
cp backend/.env.example backend/.env

Edit backend/.env with your Keycloak details:

KEYCLOAK_URL=https://your-keycloak.example.com
KEYCLOAK_REALM=your-realm
KEYCLOAK_CLIENT_ID=mcp-gateway
KEYCLOAK_CLIENT_SECRET=your-client-secret

2. Update the frontend Keycloak config

In compose.yml, update the frontend environment variables to match your Keycloak instance:

environment:
  - VITE_KEYCLOAK_URL=https://your-keycloak.example.com
  - VITE_KEYCLOAK_REALM=your-realm
  - VITE_KEYCLOAK_CLIENT_ID=mcp-gateway

3. Start the stack

docker compose up --build

This starts three services:

| Service | Port | Description | |---------|------|-------------| | gateway | 8000 | FastAPI backend | | frontend | 5173 | React dev server (Vite) | | surrealdb | 8001 | SurrealDB database |

4. Open the dashboard

Navigate to http://localhost:5173 and log in with your Keycloak credentials. From the admin dashboard you can register upstream MCP servers and configure tool permissions.

Deployment: Kubernetes

1. Create the namespace

kubectl apply -f k8s/namespace/

2. Create secrets

Copy the example secret templates and fill in your values:

cp k8s/proxy/secrets.example.yaml k8s/proxy/secrets.yaml
cp k8s/surrealdb/secrets.example.yaml k8s/surrealdb/secrets.yaml

Edit both files with your actual credentials. To generate an encryption key:

python3 -c "from cryptography.fernet import Fernet; print(Fernet.generate_key().decode())"

Apply the secrets:

kubectl apply -f k8s/surrealdb/secrets.yaml
kubectl apply -f k8s/proxy/secrets.yaml

3. Deploy SurrealDB

kubectl apply -f k8s/surrealdb/
kubectl rollout status deployment/surrealdb -n mcp-platform --timeout=120s

Note: The PVC in k8s/surrealdb/pvc.yaml has no storageClassName set. Uncomment and set it to match your cluster's storage class (e.g. standard, longhorn, local-path).

4. Build and push container images

Build the backend and frontend images and push them to your registry:

# Backend
docker build -t your-registry.example.com/just4mcps/proxy:latest mcp-gateway/backend/
docker push your-registry.example.com/just4mcps/proxy:latest

# Frontend
docker build --target prod -t your-registry.example.com/just4mcps/frontend:latest mcp-gateway/frontend/
docker push your-registry.example.com/just4mcps/frontend:latest

5. Update manifests with your values

Before applying, edit these files to match your environment:

  • k8s/proxy/deployment.yaml — image registry, Keycloak URL/realm/client, admin groups, gateway URL, CORS origins
  • k8s/proxy/ingressroute.yaml — domain name, Keycloak JWKS URL, TLS cert resolver
  • k8s/mcp-gateway/frontend/deployment.yaml — image registry, Keycloak URL/realm/client

6. Deploy the proxy and frontend

kubectl apply -f k8s/proxy/
kubectl rollout status deployment/mcp-proxy -n mcp-platform --timeout=120s

kubectl apply -f k8s/mcp-gateway/frontend/
kubectl rollout status deployment/mcp-frontend -n mcp-platform --timeout=120s

7. Configure ingress

The included k8s/proxy/ingressroute.yaml is a Traefik IngressRoute. If you use a different ingress controller (nginx, Istio, etc.), adapt the routing rules accordingly. The key routes are:

| Path | JWT Required | Purpose | |------|-------------|---------| | /.well-known/oauth-* | No | MCP OAuth discovery (RFC 9728) | | /api/auth/* | No | Token exchange proxy | | /api/{slug}/mcp | App-validated | MCP protocol endpoints | | /api/* | Yes | Admin API | | /* | No | Frontend SPA |

Adding Upstream MCP Servers

Once deployed, upstream MCP servers are managed entirely through the admin dashboard — no manifest changes required.

  1. Log in to the dashboard with an account that belongs to one of the configured admin groups.
  2. Navigate to MCP Servers and click Register Server.
  3. Provide the server's name, slug (URL-safe identifier), and upstream URL.
  4. The gateway will connect and discover available tools automatically.
  5. Go to Groups to assign tool-level permissions to your Keycloak groups.

MCP clients connect to https://your-gateway.example.com/api/{slug}/mcp and authenticate via OAuth2 PKCE. The gateway handles credential injection and tool-level access control transparently.

Configuration Reference

All configuration is done via environment variables. The backend uses pydantic-settings — set them in your .env file or directly in your deployment manifests.

| Variable | Required | Default | Description | |----------|----------|---------|-------------| | KEYCLOAK_URL | Yes | — | Base URL of your OIDC provider (e.g. https://auth.example.com) | | KEYCLOAK_REALM | Yes | — | Realm or tenant path segment (Keycloak: realm name; others: see note below) | | KEYCLOAK_CLIENT_ID | Yes | — | OAuth2 client ID | | KEYCLOAK_CLIENT_SECRET | No | — | Client secret (for confidential clients) | | KEYCLOAK_GROUPS_CLAIM | No | groups | JWT claim containing group/role memberships (works with any provider) | | ADMIN_GROUPS | No | ["/admins"] | JSON list of group paths with admin access | | SURREAL_URL | No | ws://localhost:8000/rpc | SurrealDB WebSocket URL | | SURREAL_USER | No | root | SurrealDB username | | SURREAL_PASS | No | root | SurrealDB password | | SURREAL_NAMESPACE | No | just4mcps | SurrealDB namespace | | SURREAL_DATABASE | No | mcp_gateway | SurrealDB database name | | GATEWAY_PUBLIC_URL | No | — | Public base URL for the API (including /api prefix if applicable) | | CORS_ORIGINS | No | ["http://localhost:5173"] | JSON list of allowed CORS origins | | CREDENTIAL_ENCRYPTION_KEY | No | — | Fernet key for encrypting per-user credentials |

Note on OIDC URL structure: The gateway constructs OIDC endpoints as {KEYCLOAK_URL}/realms/{KEYCLOAK_REALM}/protocol/openid-connect/*, which matches Keycloak's URL pattern. For other providers, set KEYCLOAK_URL and KEYCLOAK_REALM so that the resulting URL resolves correctly, or fork the keycloak_issuer property in config.py to match your provider's discovery endpoint structure.

Frontend environment variables

These are injected at container start via docker-entrypoint.sh into window.__env__:

| Variable | Default | Description | |----------|---------|-------------| | VITE_API_URL | http://localhost:8000 | Backend API base URL | | VITE_KEYCLOAK_URL | — | OIDC provider base URL | | VITE_KEYCLOAK_REALM | — | Realm / tenant path segment | | VITE_KEYCLOAK_CLIENT_ID | — | OAuth2 client ID |

Identity Provider Setup

Just4MCPs works with any OIDC-compliant identity provider. The core requirements are:

  1. A confidential OAuth2 client — with Authorization Code + PKCE grant enabled
  2. A group/role claim in the JWT — the gateway reads group memberships from a configurable JWT claim (default: groups) to enforce RBAC

Set your redirect URI to https://your-gateway.example.com/* and your post-logout redirect to https://your-gateway.example.com.

The group claim

This is the key piece. The gateway needs a claim in the access token (or ID token) that contains an array of group or role names. The claim name is configurable via KEYCLOAK_GROUPS_CLAIM (it works with any provider despite the name). Your ADMIN_GROUPS list must match the values your provider puts in that claim.

For example, if your provider emits "groups": ["/admins", "/developers"], then set ADMIN_GROUPS='["/admins"]' to grant those users admin access.

Provider-specific guidance

Keycloak: Create a confidential client, then add a Group Membership mapper to your client scope with Token Claim Name set to groups. Create groups (e.g. /admins) and assign users.

Auth0: Create a Regular Web Application. Use an Auth0 Action (Login flow) to add group/role memberships to the access token under a custom claim like https://your-app/groups. Set KEYCLOAK_GROUPS_CLAIM to match that claim name.

Okta: Create a Web Application with Authorization Code + PKCE. Add a Groups claim to your authorization server (Security → API → default → Claims) filtering by your desired groups. The claim name should match KEYCLOAK_GROUPS_CLAIM.

Azure AD / Entra ID: Register an application, enable ID tokens, and configure Token configuration → Add groups claim. Azure emits group object IDs by default — you may want to configure it to emit group names instead, or map IDs to names in your ADMIN_GROUPS config.

Development

The Docker Compose setup includes hot-reload for both backend and frontend:

cd mcp-gateway
docker compose up --build --watch
  • Backend changes in backend/app/ trigger automatic restart.
  • Frontend changes are picked up instantly by Vite's dev server.

License

This project is licensed under the MIT License — see LICENSE for details.

Quick Setup
Installation guide for this server

Install Package (if required)

npx @modelcontextprotocol/server-just4mcps

Cursor configuration (mcp.json)

{ "mcpServers": { "hraisikai-just4mcps": { "command": "npx", "args": [ "hraisikai-just4mcps" ] } } }