131 lines
3.9 KiB
PHP
131 lines
3.9 KiB
PHP
<?php
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function output($code, $msg = '', $logs = ['']) {
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http_response_code($code);
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$shortCode = $code / 100 % 10;
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if ($shortCode === 5)
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error_log('Internal error: ' . strip_tags($msg) . implode(LF, $logs));
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$final_message = match ($shortCode) {
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2 => ($msg === '') ? '' : '<p><output>' . _('<strong>Success</strong>: ') . '<em>' . $msg . '</em></output></p>' . LF,
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4 => '<p><output>' . _('<strong>User error</strong>: ') . '<em>' . $msg . '</em></output></p>' . LF,
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5 => '<p><output>' . _('<strong>Server error</strong>: ') . '<em>' . $msg . '</em></output></p>' . LF,
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};
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displayPage(['final_message' => $final_message]);
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}
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function insert($table, $values) {
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$query = 'INSERT INTO "' . $table . '"(';
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foreach ($values as $key => $val) {
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if ($key === array_key_last($values))
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$query .= "$key";
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else
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$query .= "$key, ";
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}
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$query .= ') VALUES(';
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foreach ($values as $key => $val) {
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if ($key === array_key_last($values))
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$query .= ":$key";
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else
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$query .= ":$key, ";
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}
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$query .= ')';
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DB->prepare($query)
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->execute($values);
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}
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function query($action, $table, $conditions = [], $column = NULL) {
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$query = match ($action) {
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'select' => 'SELECT *',
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'delete' => 'DELETE',
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};
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$query .= ' FROM "' . $table . '"';
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foreach ($conditions as $key => $val) {
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if ($key === array_key_first($conditions))
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$query .= " WHERE $key = :$key";
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else
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$query .= " AND $key = :$key";
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}
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$stmt = DB->prepare($query);
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$stmt->execute($conditions);
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return array_column($stmt->fetchAll(PDO::FETCH_ASSOC), $column);
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}
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function displayIndex() { ?>
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<nav>
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<dl>
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<?php foreach (PAGES[SERVICE] as $pageId => $page) {
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if ($pageId === 'index') continue;
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?>
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<dt><a href="<?= $pageId ?>"><?= $page['title'] ?></a></dt>
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<dd>
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<?= $page['description'] ?>
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</dd>
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<?php } ?>
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</dl>
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</nav>
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<?php
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}
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function redirUrl($pageId) {
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return CONF['common']['prefix'] . '/' . $pageId . '?redir=' . PAGE_URL;
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}
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function redir($redir_to = NULL) {
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$redir_to ??= $_GET['redir'] ?? NULL;
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if ($redir_to === NULL) {
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header('Location: ' . CONF['common']['prefix'] . '/');
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exit();
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}
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if (preg_match('/^[0-9a-z\/-]{0,128}$/D', $redir_to) !== 1)
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output(403, 'Wrong character in <code>redir</code>.');
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header('Location: ' . CONF['common']['prefix'] . '/' . $redir_to);
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exit();
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}
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// PHP rmdir() only works on empty directories
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function removeDirectory($dir) {
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$dirObj = new RecursiveDirectoryIterator($dir, RecursiveDirectoryIterator::SKIP_DOTS);
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$files = new RecursiveIteratorIterator($dirObj, RecursiveIteratorIterator::CHILD_FIRST);
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foreach ($files as $file)
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$file->isDir() && !$file->isLink() ? rmdir($file->getPathname()) : unlink($file->getPathname());
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if (rmdir($dir) !== true)
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output(500, 'Unable to remove directory.');
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}
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function equalArrays($a, $b) {
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return array_diff($a, $b) === [] AND array_diff($b, $a) === [];
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}
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/*
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This token authenticates the user to the server through a public communication (the DNS).
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It is therefore also designed to keep private:
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- the user's id
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- that a same user used a token multiple times (by using a unique salt for each token)
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*/
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if (time() - query('select', 'params', ['name' => 'secret_key_last_change'], 'value')[0] >= 86400 * 20) {
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DB->prepare("UPDATE params SET value = :secret_key WHERE name = 'secret_key';")
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->execute([':secret_key' => bin2hex(random_bytes(32))]);
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DB->prepare("UPDATE params SET value = :last_change WHERE name = 'secret_key_last_change';")
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->execute([':last_change' => time()]);
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}
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define('SECRET_KEY', hex2bin(query('select', 'params', ['name' => 'secret_key'], 'value')[0]));
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function getAuthToken() {
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$salt = bin2hex(random_bytes(4));
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$hash = hash_hmac('sha256', $salt . ($_SESSION['id'] ?? ''), SECRET_KEY);
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return $salt . '-' . substr($hash, 0, 32);
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}
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function checkAuthToken($salt, $hash) {
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$correctProof = substr(hash_hmac('sha256', $salt . $_SESSION['id'], SECRET_KEY), 0, 32);
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if (hash_equals($correctProof, $hash) !== true)
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output(403, _('Wrong proof.'));
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}
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