add user getter by id

api/user/handle.go

@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"log/slog"
 	"net/http"
+	"strconv"
 
 	"git.oblat.lv/alex/triggerssmith/internal/config"
 	"git.oblat.lv/alex/triggerssmith/internal/server"
@@ -30,7 +31,7 @@ func MustRoute(config *config.Config, userService *user.Service) func(chi.Router
 
 	return func(r chi.Router) {
 		r.Get("/", h.getUsers)        // /users
-		//r.Get("/{userId}", h.GetUser)       // /users/{userId}
+		r.Get("/{userId}", h.GetUser) // /users/{userId}
 		//r.Post("/", h.createUser)           // /users
 		//r.Patch("/{userId}", h.updateUser)  // /users/{userId}
 		//r.Delete("/{userId}", h.deleteUser) // /users/{userId}
@@ -66,3 +67,37 @@ func (h *userHandler) getUsers(w http.ResponseWriter, r *http.Request) {
 	}
 	json.NewEncoder(w).Encode(resp_users)
 }
+
+// @Summary	Get user by ID
+// @Tags		users
+// @Produce	json
+// @Param		userId	path		int	true	"User ID"
+// @Success	200		{object}	getUserResponseUnit
+// @Failure	400		{object}	server.ProblemDetails
+// @Failure	404		{object}	server.ProblemDetails
+// @Failure	500		{object}	server.ProblemDetails
+// @Router		/api/users/{userId} [get]
+func (h *userHandler) GetUser(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json")
+	userIdStr := chi.URLParam(r, "userId")
+	userId, err := strconv.Atoi(userIdStr)
+	if err != nil || userId < 0 {
+		server.WriteProblem(w, http.StatusBadRequest, "/errors/acl/invalid-user-id", "Invalid user ID", "User ID must be positive integer", r)
+		return
+	}
+	user, err := h.u.GetBy("id", userIdStr)
+	if err != nil {
+		slog.Error("failed get user by id", "err", err.Error())
+		server.WriteProblem(w, http.StatusInternalServerError, "/errors/internal-server-error", "Internal Server Error", "Failed to get user by ID, may not found", r)
+		return
+	}
+	if user == nil {
+		server.WriteProblem(w, http.StatusNotFound, "/errors/not-found", "Not Found", "User not found", r)
+		return
+	}
+	resp_user := getUserResponseUnit{
+		UserId:   user.ID,
+		UserName: user.Username,
+	}
+	json.NewEncoder(w).Encode(resp_user)
+}