server: implement working db transaction with users

server/api/user.go

@@ -4,6 +4,7 @@ import (
 	"log/slog"
 	"net/http"
 
+	"github.com/go-chi/render"
 	"github.com/google/uuid"
 )
 
@@ -17,6 +18,70 @@ func Whoami(w http.ResponseWriter, r *http.Request) {
 	}
 }
 
+func ListUsers(w http.ResponseWriter, r *http.Request) {
+	slog.Debug("user: entering ListUsers handler")
+	dbUsers, err := dbGetAllUsers()
+	if err != nil {
+		slog.Error("user: failed to fetch users", "error", err)
+		render.Render(w, r, ErrRender(err))
+		return
+	}
+
+	slog.Debug("user: successfully fetched users", "count", len(dbUsers))
+	if err := render.RenderList(w, r, NewUserListResponse(dbUsers)); err != nil {
+		slog.Error("user: failed to render user list response", "error", err)
+		render.Render(w, r, ErrRender(err))
+		return
+	}
+}
+
+func newUserID() uuid.UUID {
+	return uuid.New()
+}
+
+func NewUser(w http.ResponseWriter, r *http.Request) {
+	slog.Debug("user: entering NewUser handler")
+	err := r.ParseMultipartForm(64 << 10)
+	if err != nil {
+		slog.Error("user: failed to parse multipartform", "error", err)
+		http.Error(w, "Unable to parse form", http.StatusBadRequest)
+		return
+	}
+
+	newUserName := r.FormValue("name")
+	password := r.FormValue("password")
+	if newUserName == "" || password == "" {
+		slog.Error("user: username or password is empty")
+		http.Error(w, "Username and password cannot be empty", http.StatusBadRequest)
+		return
+	}
+
+	slog.Debug("user: hashing password for new user", "userName", newUserName)
+	hashedPassword, err := hashPassword(password)
+	if err != nil {
+		slog.Error("user: failed to hash password", "error", err)
+		http.Error(w, "Unable to hash password", http.StatusInternalServerError)
+		return
+	}
+
+	newUser := User{
+		ID:       newUserID(),
+		Name:     newUserName,
+		Password: hashedPassword,
+	}
+
+	slog.Debug("user: adding new user to database", "userID", newUser.ID, "userName", newUser.Name)
+	err = dbAddUser(&newUser)
+	if err != nil {
+		slog.Error("user: failed to add new user", "userID", newUser.ID, "userName", newUser.Name, "error", err)
+		render.Render(w, r, ErrRender(err))
+		return
+	}
+
+	slog.Debug("user: successfully added new user", "userID", newUser.ID, "userName", newUser.Name)
+	render.Render(w, r, NewUserPayloadResponse(&newUser))
+}
+
 type User struct {
 	ID       uuid.UUID `json:"id"`
 	Name     string    `json:"name"`