html-over-dns/publish-zones.php
Jacob Kiers 054634b2c4 Add prototype
Signed-off-by: Jacob Kiers <jacob@jacobkiers.net>
2021-08-17 00:59:11 +02:00

172 lines
4.4 KiB
PHP

<?php declare(strict_types=1);
class Content
{
public string $data;
public string $mimeType;
public string $fileName;
public string $hash;
private array $metadata = [];
const TTL = 60;
public function __construct(string $file)
{
$this->fileName = basename(dirname($file)).'/'.basename($file);
$this->data = file_get_contents($file);
$this->hash = md5($this->data);
$this->parseMetadata();
}
public function toRecords(): string
{
$chunks = str_split(base64_encode($this->data), 250);
$records = [];
$records[] = "; {$this->getDnsName()}";
$records[] = $this->getDnsName().$this->buildMiddle().'"'.$this->buildIndexString(count($chunks)).'"';
foreach($chunks as $id => $chunk)
{
$records[] = $this->buildRecord($id, $chunk);
}
$result = "";
foreach ($records as $record)
{
$result .= $record . PHP_EOL;
}
return $result;
}
private function getDnsName(): string
{
return str_replace(['/', '\\', '.'], '-', $this->fileName);
}
private function buildIndexString(int $chunkCount): string
{
$metadata = base64_encode(json_encode($this->metadata));
return "t={$this->mimeType()};c={$chunkCount};h={$this->hash};m={$metadata}";
}
private function buildMiddle(): string
{
return "\t".self::TTL."\tIN\tTXT\t";
}
private function buildRecord(int $id, string $data): string
{
$name = "$id.{$this->hash}";
return "$name".$this->buildMiddle().'"'.$data.'"';
}
private function mimeType()
{
$extension = pathinfo($this->fileName, PATHINFO_EXTENSION);
switch($extension)
{
case "js":
return "text/javascript";
case "md":
return "text/markdown";
default:
return mime_content_type($this->file);
}
}
private function parseMetadata()
{
if ($this->mimeType() != "text/markdown") return [];
$frontmatter_chars = "+++";
$end_of_frontmatter = strpos($this->data, $frontmatter_chars, 2);
if (false === $end_of_frontmatter) {
var_dump($end_of_frontmatter);
return [];
}
$frontmatter = substr(
$this->data,
strlen($frontmatter_chars) + 1,
$end_of_frontmatter - strlen($frontmatter_chars) - 2
);
$this->data = trim(substr($this->data, $end_of_frontmatter + strlen($frontmatter_chars))).PHP_EOL;
$lines = explode(PHP_EOL, $frontmatter);
foreach($lines as $line) {
$eq_pos = strpos($line, "=");
$key = trim(substr($line, 0, $eq_pos - 1));
$value = trim(substr($line, $eq_pos + 1));
$this->metadata[$key] = $value;
}
}
}
function update_serial_line(string $line)
{
$matches = [];
preg_match("#(\s+)(\d{10})(.*)#", $line, $matches);
list($_, $start, $serial, $last) = $matches;
$today = date("Ymd");
$day = substr($serial, 0, 8);
$nr = (int) substr($serial, -2);
if ($day === $today) {
$nr++;
} else {
$day = $today;
$nr = 1;
}
$new_serial = sprintf('%1$s%2$02d', $day, $nr);
return $start.$new_serial.$last;
}
$zone_file = "zones/db.hod.experiments.jacobkiers.net";
if (!file_exists($zone_file)) {
fwrite(STDERR, "The zone file {$zone_file} does not exist!");
exit(1);
}
$lines = file($zone_file);
foreach($lines as $index => &$line)
{
if (str_contains($line, "; serial")) {
$matches = [];
preg_match("#(\s+)(\d{10})(.*)#", $line, $matches);
list($_, $start, $serial, $last) = $matches;
$line = update_serial_line($line).PHP_EOL;
}
if (str_starts_with($line, ";; START BLOG RECORDS")) break;
}
$zone_file_contents = implode("", array_slice($lines, 0, $index+1));
echo $zone_file_contents;
$it = new RecursiveIteratorIterator(new RecursiveDirectoryIterator(__DIR__."/content"));
foreach ($it as $file)
{
if ($file->isDir()) continue;
if (str_contains($file->getPathname(), "ignore")) continue;
$bootstrap = new Content($file->getPathname());
$zone_file_contents .= PHP_EOL.$bootstrap->toRecords().PHP_EOL;
}
$zone_file_contents .= PHP_EOL;
#echo $zone_file_contents;
file_put_contents($zone_file, $zone_file_contents);