Convert Platform.sh Redirect to Table for Fastly

convert_psh_redirect_to_fastly_table.php

<?php
require __DIR__.'./../../../ezplatform/vendor/autoload.php';

// At least one table
$tableCount = 1;

// to skip the N first routes
$skipFirst = getenv('SKIP') ? : 0;

$projectName = getenv('PROJECTNAME') ? : 'project';
$route = getenv('ROUTE') ? : 'https://{default}/';
$limit = getenv('LIMIT') ? : 1000;
$domain = getenv('DOMAIN') ? : '{default}';

$tablePrefix = $projectName.'_redirects_list';

$inBlock = function ($blockName, $lines) {
    $string = "{$blockName} {".PHP_EOL;

    foreach ($lines as $line) {
        $string .= "\t{$line}".PHP_EOL;
    }

    $string .= '}'.PHP_EOL;

    return $string;
};

$count = 0;
$routes = Symfony\Component\Yaml\Yaml::parse(file_get_contents(__DIR__.'/../../../.platform/routes.yaml'));
$redirects = $routes[$route]['redirects']['paths'];

// # TABLE CREATION
$tables = [];
$rows = [];
foreach ($redirects as $from => ['to' => $to]) {
    if ($count < $skipFirst) {
        $count++;
        continue;
    }
    $cleanTo = str_replace("{default}", $domain, $to);
    $rows[] = "\"{$from}\": \"{$cleanTo}\",";
    if (\count($rows) >= $limit) {
        $tables[] = "{$tablePrefix}{$tableCount}";
        print $inBlock("table {$tablePrefix}{$tableCount}", $rows);
        $rows = [];
        $tableCount++;
    }
    $count++;
}
$tables[] = "{$tablePrefix}{$tableCount}";
print $inBlock("table {$tablePrefix}{$tableCount}", $rows);

// # VCL_RECV
$rows = [];
foreach ($tables as $table) {
    $rows[] = "if (table.lookup({$table}, req.url.path)) { error 618 \"{$table}\"; }";
}

print $inBlock('sub vcl_recv', $rows);

// # VCL_ERROR
print $inBlock('sub vcl_error',
               array_map(fn($table) => $inBlock("if (obj.status == 618 && obj.response == \"{$table}\")",
                                                [
                                                    "\tset obj.status = 301;",
                                                    "\tset obj.http.Location = table.lookup({$table}, req.url.path);",
                                                    "\treturn (deliver);"

                                                ]),
                   $tables)
);