diff options
Diffstat (limited to 'index.go')
-rw-r--r-- | index.go | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/index.go b/index.go new file mode 100644 index 0000000..a75f3d2 --- /dev/null +++ b/index.go @@ -0,0 +1,117 @@ +/* + * Index page + * + * 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" + "fmt" + "log" + "net/http" + + "github.com/jackc/pgx/v5" +) + +/* + * Serve the index page. Also handles the login page in case the user doesn't + * have any valid login cookies. + */ +func handleIndex(w http.ResponseWriter, req *http.Request) { + sessionCookie, err := req.Cookie("session") + if errors.Is(err, http.ErrNoCookie) { + authURL, err := generateAuthorizationURL() + if err != nil { + wstr(w, http.StatusInternalServerError, "Cannot generate authorization URL") + return + } + err = tmpl.ExecuteTemplate( + w, + "login", + map[string]string{ + "authURL": authURL, + /* + * We directly generate the login URL here + * instead of doing so in a redirect to save + * requests. + */ + }, + ) + if err != nil { + log.Println(err) + return + } + return + } else if err != nil { + wstr(w, http.StatusBadRequest, "Error: Unable to check cookie.") + return + } + + var userID, userName, userDepartment string + err = db.QueryRow( + req.Context(), + "SELECT id, name, department FROM users WHERE session = $1", + sessionCookie.Value, + ).Scan(&userID, &userName, &userDepartment) + if err != nil { + if errors.Is(err, pgx.ErrNoRows) { + authURL, err := generateAuthorizationURL() + if err != nil { + wstr(w, http.StatusInternalServerError, "Cannot generate authorization URL") + return + } + err = tmpl.ExecuteTemplate( + w, + "login", + map[string]interface{}{ + "authURL": authURL, + "notes": "You sent an invalid session cookie.", + }, + ) + if err != nil { + log.Println(err) + return + } + return + } + wstr(w, http.StatusInternalServerError, fmt.Sprintf("Error: Unexpected database error: %s", err)) + return + } + + err = func() error { + coursesLock.RLock() + defer coursesLock.RUnlock() + return tmpl.ExecuteTemplate( + w, + "student", + map[string]interface{}{ + "open": true, + "user": map[string]interface{}{ + "Name": userName, + "Department": userDepartment, + }, + "courses": courses, + }, + ) + }() + if err != nil { + log.Println(err) + return + } +} |