110 lines
3.0 KiB
PHP
110 lines
3.0 KiB
PHP
<?php
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declare(strict_types=1);
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define('REPO_RAW_BASE_URL', getenv('REPO_RAW_BASE_URL') ?: 'https://git.fnet.cz/lachtan/get/raw/branch/master/');
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const MANIFEST_PATH = 'manifest.yaml';
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const TEMPLATES_DIRECTORY = __DIR__ . '/../templates';
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const FETCH_TIMEOUT_SECONDS = 5;
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function sendPlainTextError(int $statusCode, string $message): never
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{
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http_response_code($statusCode);
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header('Content-Type: text/plain; charset=utf-8');
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echo $message . "\n";
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exit;
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}
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function fetchRaw(string $relativePath): string|false
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{
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$url = REPO_RAW_BASE_URL . ltrim($relativePath, '/');
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$curl = curl_init($url);
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curl_setopt_array($curl, [
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CURLOPT_RETURNTRANSFER => true,
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CURLOPT_FAILONERROR => true,
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CURLOPT_FOLLOWLOCATION => true,
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CURLOPT_MAXREDIRS => 3,
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CURLOPT_TIMEOUT => FETCH_TIMEOUT_SECONDS,
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]);
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$content = curl_exec($curl);
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return is_string($content) ? $content : false;
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}
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function escapeForDoubleQuotedShellString(string $value): string
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{
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return str_replace(['\\', '"', '$', '`'], ['\\\\', '\\"', '\\$', '\\`'], $value);
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}
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function resolveHomePath(string $path): string
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{
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if ($path === '~' || str_starts_with($path, '~/')) {
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return '$HOME' . escapeForDoubleQuotedShellString(substr($path, 1));
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}
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return escapeForDoubleQuotedShellString($path);
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}
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function renderScriptTemplate(string $templateName, array $placeholders): string|false
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{
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$path = TEMPLATES_DIRECTORY . '/' . $templateName . '.sh.tpl';
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if (!is_file($path)) {
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return false;
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}
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$script = file_get_contents($path);
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foreach ($placeholders as $key => $value) {
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$script = str_replace('{{' . $key . '}}', $value, $script);
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}
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return $script;
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}
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$requestPath = parse_url($_SERVER['REQUEST_URI'] ?? '/', PHP_URL_PATH) ?? '/';
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$name = trim(rawurldecode($requestPath), '/');
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if ($name === '') {
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sendPlainTextError(400, 'Missing name of the installable item');
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}
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$manifestYaml = fetchRaw(MANIFEST_PATH);
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if ($manifestYaml === false) {
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sendPlainTextError(502, 'Failed to fetch the manifest from git.fnet.cz');
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}
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$manifest = yaml_parse($manifestYaml);
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if ($manifest === false) {
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sendPlainTextError(502, 'Failed to parse the manifest from git.fnet.cz');
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}
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$entry = $manifest[$name] ?? null;
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if ($entry === null) {
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sendPlainTextError(404, "Unknown item '$name'");
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}
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if (!is_string($entry['source'] ?? null) || !is_string($entry['target'] ?? null) || !is_string($entry['template'] ?? null)) {
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sendPlainTextError(500, "Malformed manifest entry for item '$name'");
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}
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$variables = [
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'SOURCE_URL' => REPO_RAW_BASE_URL . escapeForDoubleQuotedShellString(ltrim($entry['source'], '/')),
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'TARGET_PATH' => resolveHomePath($entry['target']),
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'POST_INSTALL' => $entry['post_install'] ?? '',
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];
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$script = renderScriptTemplate($entry['template'], $variables);
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if ($script === false) {
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sendPlainTextError(500, 'Template for this item is missing');
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}
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header('Content-Type: text/x-shellscript; charset=utf-8');
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echo $script;
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