feat: added API gateway

internal/gw/handler/common.go

@@ -0,0 +1,75 @@
+package handler
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"strconv"
+
+	"datarush/internal/gw/domain"
+	"datarush/internal/gw/middleware"
+
+	"github.com/gorilla/mux"
+)
+
+func getUserIDFromContext(ctx context.Context) (string, error) {
+	return middleware.GetUserIDFromContext(ctx)
+}
+
+func getPathParam(r *http.Request, key string) string {
+	vars := mux.Vars(r)
+	return vars[key]
+}
+
+func getQueryParam(r *http.Request, key string) string {
+	return r.URL.Query().Get(key)
+}
+
+func getQueryParamInt(r *http.Request, key string, defaultValue int) int {
+	val := r.URL.Query().Get(key)
+	if val == "" {
+		return defaultValue
+	}
+
+	intVal, err := strconv.Atoi(val)
+	if err != nil {
+		return defaultValue
+	}
+
+	return intVal
+}
+
+func getQueryParamInt32(r *http.Request, key string, defaultValue int32) int32 {
+	return int32(getQueryParamInt(r, key, int(defaultValue)))
+}
+
+func getQueryParamBool(r *http.Request, key string) *bool {
+	val := r.URL.Query().Get(key)
+	if val == "" {
+		return nil
+	}
+
+	boolVal, err := strconv.ParseBool(val)
+	if err != nil {
+		return nil
+	}
+
+	return &boolVal
+}
+
+type PingHandler struct{}
+
+func NewPingHandler() *PingHandler {
+	return &PingHandler{}
+}
+
+func (h *PingHandler) Ping(w http.ResponseWriter, r *http.Request) {
+	response := &domain.PingResponse{
+		Message: "pong",
+		Status:  "ok",
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(http.StatusOK)
+	json.NewEncoder(w).Encode(response)
+}