feat: impl requests handllers for contacts and healthcheck

internal/handler/response.go

@@ -0,0 +1,56 @@
+package handler
+
+import (
+	"encoding/json"
+	"net/http"
+)
+
+type APIResponse struct {
+	Success bool       `json:"success"`
+	Data    any        `json:"data,omitempty"`
+	Errors  []APIError `json:"errors,omitempty"`
+	Message string     `json:"message,omitempty"`
+}
+
+type APIError struct {
+	Code    int    `json:"code"`
+	Message string `json:"message"`
+	Details string `json:"details,omitempty"`
+}
+
+const content_type = "Content-Type"
+const application_json = "application/json"
+
+func JSONSuccess(w http.ResponseWriter, data any, message string, statusCode int) {
+	w.Header().Set(content_type, application_json)
+	w.WriteHeader(statusCode)
+	json.NewEncoder(w).Encode(APIResponse{
+		Success: true,
+		Data:    data,
+		Message: message,
+	})
+}
+
+func JSONError(w http.ResponseWriter, message, details string, code, statusCode int) {
+	w.Header().Set(content_type, application_json)
+	w.WriteHeader(statusCode)
+	json.NewEncoder(w).Encode(APIResponse{
+		Success: false,
+		Errors: []APIError{
+			{
+				Code:    code,
+				Message: message,
+				Details: details,
+			},
+		},
+	})
+}
+
+func JSONErrors(w http.ResponseWriter, errors []APIError, statusCode int) {
+	w.Header().Set(content_type, application_json)
+	w.WriteHeader(statusCode)
+	json.NewEncoder(w).Encode(APIResponse{
+		Success: false,
+		Errors:  errors,
+	})
+}