Initial commit: breakpilot-compliance - Compliance SDK Platform

Services: Admin-Compliance, Backend-Compliance,
AI-Compliance-SDK, Consent-SDK, Developer-Portal,
PCA-Platform, DSMS

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

breakpilot-compliance-sdk/services/api-gateway/internal/middleware/auth.go

@@ -0,0 +1,117 @@
+// Package middleware provides HTTP middleware for the API Gateway
+package middleware
+
+import (
+	"net/http"
+	"strings"
+
+	"github.com/gin-gonic/gin"
+	"github.com/golang-jwt/jwt/v5"
+)
+
+// Claims represents JWT claims
+type Claims struct {
+	TenantID string   `json:"tenant_id"`
+	UserID   string   `json:"user_id"`
+	Scopes   []string `json:"scopes"`
+	jwt.RegisteredClaims
+}
+
+// Auth middleware validates JWT tokens or API keys
+func Auth(jwtSecret string) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		authHeader := c.GetHeader("Authorization")
+		if authHeader == "" {
+			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{
+				"error": "Missing authorization header",
+			})
+			return
+		}
+
+		// Check for Bearer token (JWT)
+		if strings.HasPrefix(authHeader, "Bearer ") {
+			tokenString := strings.TrimPrefix(authHeader, "Bearer ")
+
+			// Check if it's an API key (starts with pk_ or sk_)
+			if strings.HasPrefix(tokenString, "pk_") || strings.HasPrefix(tokenString, "sk_") {
+				// API Key authentication
+				if err := validateAPIKey(c, tokenString); err != nil {
+					c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{
+						"error": "Invalid API key",
+					})
+					return
+				}
+			} else {
+				// JWT authentication
+				claims, err := validateJWT(tokenString, jwtSecret)
+				if err != nil {
+					c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{
+						"error": "Invalid token",
+					})
+					return
+				}
+
+				// Store claims in context
+				c.Set("tenant_id", claims.TenantID)
+				c.Set("user_id", claims.UserID)
+				c.Set("scopes", claims.Scopes)
+			}
+		} else {
+			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{
+				"error": "Invalid authorization format",
+			})
+			return
+		}
+
+		c.Next()
+	}
+}
+
+func validateJWT(tokenString, secret string) (*Claims, error) {
+	token, err := jwt.ParseWithClaims(tokenString, &Claims{}, func(token *jwt.Token) (interface{}, error) {
+		return []byte(secret), nil
+	})
+
+	if err != nil {
+		return nil, err
+	}
+
+	if claims, ok := token.Claims.(*Claims); ok && token.Valid {
+		return claims, nil
+	}
+
+	return nil, jwt.ErrTokenInvalidClaims
+}
+
+func validateAPIKey(c *gin.Context, apiKey string) error {
+	// In production, this would validate against a database of API keys
+	// For now, we extract tenant info from the X-Tenant-ID header
+	tenantID := c.GetHeader("X-Tenant-ID")
+	if tenantID == "" {
+		tenantID = "default"
+	}
+
+	c.Set("tenant_id", tenantID)
+	c.Set("user_id", "api-key-user")
+	c.Set("scopes", []string{"read", "write"})
+
+	return nil
+}
+
+// TenantIsolation ensures requests only access their own tenant's data
+func TenantIsolation() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		tenantID, exists := c.Get("tenant_id")
+		if !exists || tenantID == "" {
+			c.AbortWithStatusJSON(http.StatusForbidden, gin.H{
+				"error": "Tenant ID required",
+			})
+			return
+		}
+
+		// Add tenant ID to all database queries (handled by handlers)
+		c.Set("tenant_filter", tenantID)
+
+		c.Next()
+	}
+}