feat(global): add authentication support with single admin account

api/middleware.go

@@ -0,0 +1,65 @@
+package main
+
+import (
+	"fmt"
+	"github.com/dgrijalva/jwt-go"
+	"net/http"
+	"strings"
+)
+
+func addMiddleware(h http.Handler, middleware ...func(http.Handler) http.Handler) http.Handler {
+	for _, mw := range middleware {
+		h = mw(h)
+	}
+	return h
+}
+
+// authenticate provides Authentication middleware for handlers
+func (api *api) authenticate(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		var token string
+
+		// Get token from the Authorization header
+		// format: Authorization: Bearer
+		tokens, ok := r.Header["Authorization"]
+		if ok && len(tokens) >= 1 {
+			token = tokens[0]
+			token = strings.TrimPrefix(token, "Bearer ")
+		}
+
+		if token == "" {
+			http.Error(w, http.StatusText(http.StatusUnauthorized), http.StatusUnauthorized)
+			return
+		}
+
+		parsedToken, err := jwt.Parse(token, func(token *jwt.Token) (interface{}, error) {
+			if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
+				msg := fmt.Errorf("Unexpected signing method: %v", token.Header["alg"])
+				return nil, msg
+			}
+			return api.secret, nil
+		})
+		if err != nil {
+			http.Error(w, "Invalid JWT token", http.StatusUnauthorized)
+			return
+		}
+
+		if parsedToken == nil || !parsedToken.Valid {
+			http.Error(w, http.StatusText(http.StatusUnauthorized), http.StatusUnauthorized)
+			return
+		}
+
+		// context.Set(r, "user", parsedToken)
+		next.ServeHTTP(w, r)
+		return
+	})
+}
+
+// SecureHeaders adds secure headers to the API
+func secureHeaders(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Add("X-Content-Type-Options", "nosniff")
+		w.Header().Add("X-Frame-Options", "DENY")
+		next.ServeHTTP(w, r)
+	})
+}