[feature] dashboard (#2361)

cmd/dashboard/handler/middleware.go

@@ -0,0 +1,51 @@
+package handler
+
+import (
+	"net/http"
+	"strings"
+
+	"github.com/asim/go-micro/cmd/dashboard/v4/config"
+	"github.com/dgrijalva/jwt-go"
+	"github.com/gin-gonic/gin"
+)
+
+func AuthRequired() gin.HandlerFunc {
+	return func(ctx *gin.Context) {
+		if ctx.Request.Method == "OPTIONS" {
+			ctx.Next()
+			return
+		}
+		tokenString := ctx.GetHeader("Authorization")
+		if len(tokenString) == 0 || !strings.HasPrefix(tokenString, "Bearer ") {
+			ctx.AbortWithStatusJSON(http.StatusUnauthorized, "")
+			return
+		}
+		tokenString = tokenString[7:]
+		claims := jwt.StandardClaims{}
+		token, err := jwt.ParseWithClaims(tokenString, &claims, func(t *jwt.Token) (interface{}, error) {
+			return []byte(config.GetAuthConfig().TokenSecret), nil
+		})
+		if err != nil {
+			ctx.AbortWithError(http.StatusUnauthorized, err)
+		}
+		if !token.Valid {
+			ctx.AbortWithStatus(http.StatusUnauthorized)
+		}
+		ctx.Set("username", claims.Subject)
+		ctx.Next()
+	}
+}
+
+func CorsHandler(allowOrigin string) gin.HandlerFunc {
+	return func(ctx *gin.Context) {
+		ctx.Header("Access-Control-Allow-Origin", allowOrigin)
+		ctx.Header("Access-Control-Allow-Headers", "Content-Type, Authorization, token")
+		ctx.Header("Access-Control-Allow-Methods", "POST, GET, DELETE, PUT, OPTIONS")
+		ctx.Header("Access-Control-Expose-Headers", "Content-Length, Access-Control-Allow-Origin, Access-Control-Allow-Headers, Content-Type")
+		ctx.Header("Access-Control-Allow-Credentials", "true")
+		if ctx.Request.Method == "OPTIONS" {
+			ctx.AbortWithStatus(http.StatusNoContent)
+		}
+		ctx.Next()
+	}
+}