1 files changed, 54 insertions, 0 deletions
diff --git a/session.go b/session.go
new file mode 100644
index 0000000..be83c5c
--- /dev/null
+++ b/session.go
@@ -0,0 +1,54 @@
+/*
+ * Session checking functions
+ *
+ * Copyright (C) 2024  Runxi Yu <https://runxiyu.org>
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package main
+
+import (
+	"errors"
+	"net/http"
+
+	"github.com/jackc/pgx/v5"
+)
+
+func getUserInfoFromRequest(req *http.Request) (userID, username, department string, retErr error) {
+	sessionCookie, err := req.Cookie("session")
+	if errors.Is(err, http.ErrNoCookie) {
+		retErr = wrapError(errNoCookie, err)
+		return
+	} else if err != nil {
+		retErr = wrapError(errCannotCheckCookie, err)
+		return
+	}
+
+	err = db.QueryRow(
+		req.Context(),
+		"SELECT id, name, department FROM users WHERE session = $1",
+		sessionCookie.Value,
+	).Scan(&userID, &username, &department)
+	if err != nil {
+		if errors.Is(err, pgx.ErrNoRows) {
+			retErr = errNoSuchUser
+			return
+		}
+		retErr = wrapError(errUnexpectedDBError, err)
+		return
+	}
+	return
+}