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/*
* Index page
*
* Copyright (C) 2024 Runxi Yu <https://runxiyu.org>
* SPDX-License-Identifier: BSD-2-Clause
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
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,
"index_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 string
err = db.QueryRow(
req.Context(),
"SELECT userid FROM sessions WHERE cookie = $1",
sessionCookie.Value,
).Scan(&userid)
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,
"index_login",
map[string]interface{}{
"authURL": authURL,
"notes": []string{"Technically you have a session cookie, but it seems invalid."},
},
)
if err != nil {
log.Println(err)
return
}
return
}
wstr(w, http.StatusInternalServerError, fmt.Sprintf("Error: Unexpected database error: %s", err))
return
}
var name string
var department string
err = db.QueryRow(
req.Context(),
"SELECT name, department FROM users WHERE id = $1",
userid,
).Scan(&name, &department)
if err != nil {
if errors.Is(err, pgx.ErrNoRows) {
wstr(w, http.StatusInternalServerError, "Error: User does not exist (database error?)")
return
}
wstr(w, http.StatusInternalServerError, "Error: Unexpected database error")
return
}
err = tmpl.ExecuteTemplate(
w,
"index",
map[string]interface{}{
"open": true,
"user": map[string]interface{}{
"Name": name,
"Department": department,
},
"courses": courses,
},
)
if err != nil {
log.Println(err)
return
}
}
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