refactor: Restructure project files for better organization, readability, and maintainability

internal/middleware/types.go

@@ -0,0 +1,105 @@
+/*
+ * Copyright 2024 Jonas Kaninda
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package middleware
+
+import (
+	"bytes"
+	"net/http"
+	"sync"
+	"time"
+)
+
+// RateLimiter defines rate limit properties.
+type RateLimiter struct {
+	Requests  int
+	Window    time.Duration
+	ClientMap map[string]*Client
+	mu        sync.Mutex
+}
+
+// Client stores request count and window expiration for each client.
+type Client struct {
+	RequestCount int
+	ExpiresAt    time.Time
+}
+
+// NewRateLimiterWindow creates a new RateLimiter.
+func NewRateLimiterWindow(requests int, window time.Duration) *RateLimiter {
+	return &RateLimiter{
+		Requests:  requests,
+		Window:    window,
+		ClientMap: make(map[string]*Client),
+	}
+}
+
+// TokenRateLimiter stores tokenRate limit
+type TokenRateLimiter struct {
+	tokens     int
+	maxTokens  int
+	refillRate time.Duration
+	lastRefill time.Time
+	mu         sync.Mutex
+}
+
+// ProxyResponseError represents the structure of the JSON error response
+type ProxyResponseError struct {
+	Success bool   `json:"success"`
+	Code    int    `json:"code"`
+	Message string `json:"message"`
+}
+
+// JwtAuth  stores JWT configuration
+type JwtAuth struct {
+	AuthURL         string
+	RequiredHeaders []string
+	Headers         map[string]string
+	Params          map[string]string
+}
+
+// AuthenticationMiddleware Define struct
+type AuthenticationMiddleware struct {
+	AuthURL         string
+	RequiredHeaders []string
+	Headers         map[string]string
+	Params          map[string]string
+}
+type AccessListMiddleware struct {
+	Path        string
+	Destination string
+	List        []string
+}
+
+// AuthBasic contains Basic auth configuration
+type AuthBasic struct {
+	Username string
+	Password string
+	Headers  map[string]string
+	Params   map[string]string
+}
+
+// InterceptErrors contains backend status code errors to intercept
+type InterceptErrors struct {
+	Errors []int
+}
+
+// responseRecorder intercepts the response body and status code
+type responseRecorder struct {
+	http.ResponseWriter
+	statusCode int
+	body       *bytes.Buffer
+}