Initial commit

internal/middleware/auth.go

@@ -0,0 +1,82 @@
+// Filename: internal/middleware/auth.go
+package middleware
+
+import (
+	"gemini-balancer/internal/service"
+	"net/http"
+	"strings"
+
+	"github.com/gin-gonic/gin"
+)
+
+// === API Admin 认证管道 (/admin/* API路由) ===
+
+func APIAdminAuthMiddleware(securityService *service.SecurityService) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		tokenValue := extractBearerToken(c)
+		if tokenValue == "" {
+			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "Authorization token is missing"})
+			return
+		}
+		authToken, err := securityService.AuthenticateToken(tokenValue)
+		if err != nil || !authToken.IsAdmin {
+			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "Invalid or non-admin token"})
+			return
+		}
+		c.Set("adminUser", authToken)
+		c.Next()
+	}
+}
+
+// === /v1 Proxy 认证 ===
+
+func ProxyAuthMiddleware(securityService *service.SecurityService) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		tokenValue := extractProxyToken(c)
+		if tokenValue == "" {
+			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "API key is missing from request"})
+			return
+		}
+		authToken, err := securityService.AuthenticateToken(tokenValue)
+		if err != nil {
+			// 通用信息，避免泄露过多信息
+			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "Invalid or inactive token provided"})
+			return
+		}
+		c.Set("authToken", authToken)
+		c.Next()
+	}
+}
+
+func extractProxyToken(c *gin.Context) string {
+	if key := c.Query("key"); key != "" {
+		return key
+	}
+	authHeader := c.GetHeader("Authorization")
+	if authHeader != "" {
+		if strings.HasPrefix(authHeader, "Bearer ") {
+			return strings.TrimPrefix(authHeader, "Bearer ")
+		}
+	}
+	if key := c.GetHeader("X-Api-Key"); key != "" {
+		return key
+	}
+	if key := c.GetHeader("X-Goog-Api-Key"); key != "" {
+		return key
+	}
+	return ""
+}
+
+// === 辅助函数 ===
+
+func extractBearerToken(c *gin.Context) string {
+	authHeader := c.GetHeader("Authorization")
+	if authHeader == "" {
+		return ""
+	}
+	parts := strings.Split(authHeader, " ")
+	if len(parts) == 2 && parts[0] == "Bearer" {
+		return parts[1]
+	}
+	return ""
+}