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408 lines
9.9 KiB
PHP

<?php declare(strict_types=1);
if (!defined('EOL')) {
define('EOL', "\n");
}
class ContentFile
{
private string $filePath;
private string $data;
private string $fileName;
private array $metadata = [];
#const RECORD_TTL = 60 * 60 * 24 * 30; // 30 days.
const RECORD_TTL = 60; // Keep it short for now, so it is easier to experiment.
const METADATA_TTL = 60; // Keep it short for now, so it is easier to update the content.
const RECORD_LENGTH = 1536;
public function __construct(string $file)
{
$this->filePath = $file;
$this->fileName = basename(dirname($file)).'/'.basename($file);
$this->data = file_get_contents($file);
$this->parseMetadata();
}
/**
* @return Record[]
*/
private function toRecords(): array
{
$chunks = $this->calculateChunks();
$hash = $this->calculateHash();
$records = [$this->buildMetadataRecord(count($chunks), $hash)];
foreach ($chunks as $id => $chunk) {
$records[] = $this->buildRecord($id, $chunk);
}
return $records;
}
public function __toString(): string
{
$result = "";
foreach ($this->toRecords() as $record) {
$result .= $record.EOL;
}
return $result;
}
public function getDnsName(): string
{
return str_replace(['/', '\\', '.'], '-', $this->fileName);
}
private function buildMetadataRecord(int $chunkCount, string $hash): Record
{
return (new Record())
->setDnsName($this->getDnsName())
->setTtl(self::METADATA_TTL)
->setContent($this->buildIndexString($chunkCount, $hash));
}
private function buildIndexString(int $chunkCount, $hash): string
{
$metadata = base64_encode(json_encode($this->metadata));
return '"'."t={$this->mimeType()};c={$chunkCount};ha=sha-1;h={$hash};m={$metadata}".'"';
}
private function buildRecord(int $id, string $data): Record
{
$name = "$id.{$this->calculateHash()}";
return (new Record())
->setContent($data)
->setDnsName($name)
->setTtl(self::RECORD_TTL);
}
private function mimeType(): string
{
$extension = pathinfo($this->fileName, PATHINFO_EXTENSION);
switch ($extension) {
case "js":
return "text/javascript";
case "md":
return "text/markdown";
default:
return mime_content_type($this->filePath);
}
}
private function parseMetadata(): void
{
if ($this->mimeType() != "text/markdown") {
return;
}
$front_matter_chars = "+++";
$front_matter_end = strpos($this->data, $front_matter_chars, 2);
if (false === $front_matter_end) {
return;
}
$front_matter = substr(
$this->data,
strlen($front_matter_chars) + 1,
$front_matter_end - strlen($front_matter_chars) - 2
);
$this->data = trim(substr($this->data, $front_matter_end + strlen($front_matter_chars))).EOL;
$lines = explode(EOL, $front_matter);
foreach ($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] = $value;
}
}
private function calculateHash(): string
{
return sha1($this->data);
}
private function calculateChunks(): array
{
return str_split(base64_encode($this->data), self::RECORD_LENGTH);
}
}
class Record
{
private string $dnsName;
private int $ttl;
private string $content;
public function setDnsName(string $dnsName): self
{
$this->dnsName = $dnsName;
return $this;
}
public function setTtl(int $ttl): self
{
$this->ttl = $ttl;
return $this;
}
public function setContent(string $content): self
{
$this->content = $content;
return $this;
}
public function getRecord(): string
{
return $this->dnsName
."\t".$this->ttl
."\tIN"
."\tTXT\t"
.$this->content;
}
public function __toString(): string
{
return $this->getRecord();
}
}
class StartOfAuthority
{
public function __construct(
private string $origin,
private string $serial,
private string $masterDnsServer,
private string $domainContact,
private int $slaveRefreshInterval,
private int $slaveRetryInterval,
private int $slaveCopyExpireTime,
private int $nxDomainCacheTime
) {
}
public function doNotUserMasterDnsServer(): self
{
$servers = $this->dnsServers;
$this->dnsServers = array_filter(
$servers,
function ($server) {
return $server !== $this->masterDnsServer;
}
);
return $this;
}
public function increaseSerial(): self
{
$matches = [];
preg_match('#(\d{8})(\d{2})#', $this->serial, $matches);
list (, $day, $count) = $matches;
$today = date("Ymd");
if ($today === $day) {
$count++;
} else {
$count = 0;
}
$this->serial = sprintf('%1$s%2$02d', $today, $count);;
return $this;
}
public function __toString(): string
{
return <<<EOF
\$ORIGIN $this->origin ; The zone of this zone file
@ IN SOA $this->masterDnsServer $this->domainContact (
$this->serial ; serial
$this->slaveRefreshInterval ; slave refresh interval
$this->slaveRetryInterval ; slave retry interval
$this->slaveCopyExpireTime ; slave copy expire time
$this->nxDomainCacheTime ; NXDOMAIN cache time
)
;
; domain name servers
;
@ IN NS $this->masterDnsServer
EOF;
}
public static function fromString(string $zonefile): self
{
$matches = [];
$found = 1 === preg_match(
'#\$ORIGIN\s+(?P<origin>[a-z.]+)[^@]+@\s+IN\s+SOA\s+(?P<dns>[a-z.]+)\s+(?P<contact>[a-z.]+)\s+\(\D+\s+(?P<serial>\d+)\D+(?P<srefresh>\d+)\D+(?P<sretry>\d+)\D+(?P<sexpire>\d+)\D+(?P<nxcache>\d+)[^\)]+\)#im',
$zonefile,
$matches
);
if (!$found) {
throw new \Exception("Could not find the SOA record.");
}
return new self(
$matches['origin'],
$matches['serial'],
$matches['dns'],
$matches['contact'],
(int)$matches['srefresh'],
(int)$matches['sretry'],
(int)$matches['sexpire'],
(int)$matches['nxcache']
);
}
}
class ZoneFile
{
private StartOfAuthority $soa;
/** @var ContentFile[] */
private array $files = [];
private int $defaultTTL = 300;
public function __construct(
private string $file
) {
$this->soa = StartOfAuthority::fromString(file_get_contents($this->file));
}
public function addFile(ContentFile ...$files): self
{
foreach ($files as $file) {
$this->files[] = $file;
}
return $this;
}
public function setDefaultTTL(int $defaultTTL): self
{
$this->defaultTTL = $defaultTTL;
return $this;
}
public function __toString(): string
{
$this->soa->increaseSerial();
$zone_file = "\$TTL\t{$this->defaultTTL}\t; Default TTL".EOL.EOL;
$zone_file .= $this->soa->__toString().EOL.EOL.EOL;
$zone_file .= ";;; START BLOG RECORDS";
foreach ($this->files as $file) {
$zone_file .= EOL.EOL.EOL;
$zone_file .= '; '.$file->getDnsName().EOL;
$zone_file .= $file;
}
$zone_file .= EOL;
return $zone_file;
}
}
function update_serial_line(string $line): string
{
$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;
}
$zone_file_path = "zones/db.hod.experiments.jacobkiers.net";
if (!file_exists($zone_file_path)) {
fwrite(STDERR, "The zone file {$zone_file_path} does not exist!");
exit(1);
}
/*
$lines = file($zone_file);
$index = 0;
foreach ($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).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;
}
$content = new ContentFile($file->getPathname());
$zone_file_contents .= EOL.$content->__toString().EOL;
}
$zone_file_contents .= EOL;
echo $zone_file_contents;
#file_put_contents($zone_file, $zone_file_contents);
*/
$zone_file = new ZoneFile($zone_file_path);
$it = new RecursiveIteratorIterator(new RecursiveDirectoryIterator(__DIR__."/content"));
foreach ($it as $file) {
if ($file->isDir()) {
continue;
}
if (str_contains($file->getPathname(), "ignore")) {
continue;
}
$content = new ContentFile($file->getPathname());
$zone_file->addFile($content);
}
$zone_file_contents = $zone_file->__toString();
echo $zone_file_contents;
file_put_contents($zone_file_path, $zone_file_contents);