add get user data method

api/auth/get_user_data.go

@@ -0,0 +1,35 @@
+package api_auth
+
+import (
+	"encoding/json"
+	"net/http"
+)
+
+type GetUserDataResponse struct {
+	UserID   uint   `json:"id"`
+	Username string `json:"username"`
+	Email    string `json:"email"`
+}
+
+func (h *authHandler) handleGetUserData(w http.ResponseWriter, r *http.Request) {
+	by := r.URL.Query().Get("by")
+	value := r.URL.Query().Get("value")
+	if value == "" {
+		value = r.URL.Query().Get(by)
+	}
+	user, err := h.a.Get(by, value)
+	if err != nil {
+		http.Error(w, "Failed to get user", http.StatusInternalServerError)
+		return
+	}
+	w.Header().Set("Content-Type", "application/json")
+	err = json.NewEncoder(w).Encode(meResponse{
+		UserID:   user.ID,
+		Username: user.Username,
+		Email:    user.Email,
+	})
+	if err != nil {
+		http.Error(w, "Failed to encode response", http.StatusInternalServerError)
+		return
+	}
+}