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OIDC Authentication in Go / Gin

Learn how to implement OIDC token validation in Gin applications using middleware.

Overview​

This guide shows you how to build Gin middleware that validates OIDC tokens from GitHub Actions, GitLab CI, Kubernetes, and other identity providers.

Coming Soon​

This guide is under development. In the meantime, refer to:

Key Topics (Planned)​

  • Using golang-jwt/jwt library
  • Creating Gin middleware
  • JWKS fetching and caching
  • Authorization middleware
  • Error handling
  • Testing with testify
  • Production deployment

Example Implementation​

package middleware

import (
    "github.com/gin-gonic/gin"
    "github.com/golang-jwt/jwt/v5"
)

func AuthMiddleware() gin.HandlerFunc {
    return func(c *gin.Context) {
        tokenString := c.GetHeader("Authorization")

        if tokenString == "" {
            c.JSON(401, gin.H{"error": "Missing authorization header"})
            c.Abort()
            return
        }

        // Verify token
        // ... (implementation details)

        c.Next()
    }
}

Contributing​

Want to help complete this guide? Contribute on GitHub.