feat: added API gateway

internal/gw/handler/auth_handler.go

@@ -0,0 +1,69 @@
+package handler
+
+import (
+	"net/http"
+
+	"datarush/internal/gw/domain"
+	"datarush/internal/gw/grpc_client"
+	"datarush/internal/gw/utils"
+)
+
+type AuthHandler struct {
+	authClient *grpc_client.AuthClient
+	userClient *grpc_client.UserClient
+}
+
+func NewAuthHandler(authClient *grpc_client.AuthClient, userClient *grpc_client.UserClient) *AuthHandler {
+	return &AuthHandler{
+		authClient: authClient,
+		userClient: userClient,
+	}
+}
+
+func (h *AuthHandler) SignUp(w http.ResponseWriter, r *http.Request) {
+	var req domain.SignUpRequest
+	if err := utils.DecodeJSON(r, &req); err != nil {
+		utils.RespondError(w, err)
+		return
+	}
+
+	token, err := h.authClient.SignUp(r.Context(), req.Email, req.Username, req.Password)
+	if err != nil {
+		utils.RespondError(w, domain.NewInternalServerError("sign up failed"))
+		return
+	}
+
+	utils.RespondJSON(w, http.StatusCreated, &domain.TokenResponse{Token: token})
+}
+
+func (h *AuthHandler) SignIn(w http.ResponseWriter, r *http.Request) {
+	var req domain.SignInRequest
+	if err := utils.DecodeJSON(r, &req); err != nil {
+		utils.RespondError(w, err)
+		return
+	}
+
+	token, err := h.authClient.SignIn(r.Context(), req.Email, req.Password)
+	if err != nil {
+		utils.RespondError(w, domain.NewUnauthorizedError("invalid credentials"))
+		return
+	}
+
+	utils.RespondJSON(w, http.StatusOK, &domain.TokenResponse{Token: token})
+}
+
+func (h *AuthHandler) GetMe(w http.ResponseWriter, r *http.Request) {
+	userID, err := getUserIDFromContext(r.Context())
+	if err != nil {
+		utils.RespondError(w, domain.NewUnauthorizedError("unauthorized"))
+		return
+	}
+
+	user, err := h.userClient.GetProfile(r.Context(), userID)
+	if err != nil {
+		utils.RespondError(w, domain.NewInternalServerError("failed to get user profile"))
+		return
+	}
+
+	utils.RespondJSON(w, http.StatusOK, utils.UserProtoToHTTP(user))
+}