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<?php
declare(strict_types=1);
namespace ZipStream;
use Closure;
use DateTimeImmutable;
use DateTimeInterface;
use GuzzleHttp\Psr7\StreamWrapper;
use Psr\Http\Message\StreamInterface;
use RuntimeException;
use ZipStream\Exception\FileNotFoundException;
use ZipStream\Exception\FileNotReadableException;
use ZipStream\Exception\OverflowException;
use ZipStream\Exception\ResourceActionException;
/**
* Streamed, dynamically generated zip archives.
*
* ## Usage
*
* Streaming zip archives is a simple, three-step process:
*
* 1. Create the zip stream:
*
* ```php
* $zip = new ZipStream(outputName: 'example.zip');
* ```
*
* 2. Add one or more files to the archive:
*
* ```php
* // add first file
* $zip->addFile(fileName: 'world.txt', data: 'Hello World');
*
* // add second file
* $zip->addFile(fileName: 'moon.txt', data: 'Hello Moon');
* ```
*
* 3. Finish the zip stream:
*
* ```php
* $zip->finish();
* ```
*
* You can also add an archive comment, add comments to individual files,
* and adjust the timestamp of files. See the API documentation for each
* method below for additional information.
*
* ## Example
*
* ```php
* // create a new zip stream object
* $zip = new ZipStream(outputName: 'some_files.zip');
*
* // list of local files
* $files = array('foo.txt', 'bar.jpg');
*
* // read and add each file to the archive
* foreach ($files as $path)
* $zip->addFileFormPath(fileName: $path, $path);
*
* // write archive footer to stream
* $zip->finish();
* ```
*/
class ZipStream
{
/**
* This number corresponds to the ZIP version/OS used (2 bytes)
* From: https://www.iana.org/assignments/media-types/application/zip
* The upper byte (leftmost one) indicates the host system (OS) for the
* file. Software can use this information to determine
* the line record format for text files etc. The current
* mappings are:
*
* 0 - MS-DOS and OS/2 (F.A.T. file systems)
* 1 - Amiga 2 - VAX/VMS
* 3 - *nix 4 - VM/CMS
* 5 - Atari ST 6 - OS/2 H.P.F.S.
* 7 - Macintosh 8 - Z-System
* 9 - CP/M 10 thru 255 - unused
*
* The lower byte (rightmost one) indicates the version number of the
* software used to encode the file. The value/10
* indicates the major version number, and the value
* mod 10 is the minor version number.
* Here we are using 6 for the OS, indicating OS/2 H.P.F.S.
* to prevent file permissions issues upon extract (see #84)
* 0x603 is 00000110 00000011 in binary, so 6 and 3
*
* @internal
*/
public const ZIP_VERSION_MADE_BY = 0x603;
private bool $ready = true;
private int $offset = 0;
/**
* @var string[]
*/
private array $centralDirectoryRecords = [];
/**
* @var resource
*/
private $outputStream;
private readonly Closure $httpHeaderCallback;
/**
* @var File[]
*/
private array $recordedSimulation = [];
/**
* Create a new ZipStream object.
*
* ##### Examples
*
* ```php
* // create a new zip file named 'foo.zip'
* $zip = new ZipStream(outputName: 'foo.zip');
*
* // create a new zip file named 'bar.zip' with a comment
* $zip = new ZipStream(
* outputName: 'bar.zip',
* comment: 'this is a comment for the zip file.',
* );
* ```
*
* @param OperationMode $operationMode
* The mode can be used to switch between `NORMAL` and `SIMULATION_*` modes.
* For details see the `OperationMode` documentation.
*
* Default to `NORMAL`.
*
* @param string $comment
* Archive Level Comment
*
* @param StreamInterface|resource|null $outputStream
* Override the output of the archive to a different target.
*
* By default the archive is sent to `STDOUT`.
*
* @param CompressionMethod $defaultCompressionMethod
* How to handle file compression. Legal values are
* `CompressionMethod::DEFLATE` (the default), or
* `CompressionMethod::STORE`. `STORE` sends the file raw and is
* significantly faster, while `DEFLATE` compresses the file and
* is much, much slower.
*
* @param int $defaultDeflateLevel
* Default deflation level. Only relevant if `compressionMethod`
* is `DEFLATE`.
*
* See details of [`deflate_init`](https://www.php.net/manual/en/function.deflate-init.php#refsect1-function.deflate-init-parameters)
*
* @param bool $enableZip64
* Enable Zip64 extension, supporting very large
* archives (any size > 4 GB or file count > 64k)
*
* @param bool $defaultEnableZeroHeader
* Enable streaming files with single read.
*
* When the zero header is set, the file is streamed into the output
* and the size & checksum are added at the end of the file. This is the
* fastest method and uses the least memory. Unfortunately not all
* ZIP clients fully support this and can lead to clients reporting
* the generated ZIP files as corrupted in combination with other
* circumstances. (Zip64 enabled, using UTF8 in comments / names etc.)
*
* When the zero header is not set, the length & checksum need to be
* defined before the file is actually added. To prevent loading all
* the data into memory, the data has to be read twice. If the data
* which is added is not seekable, this call will fail.
*
* @param bool $sendHttpHeaders
* Boolean indicating whether or not to send
* the HTTP headers for this file.
*
* @param ?Closure $httpHeaderCallback
* The method called to send HTTP headers
*
* @param string|null $outputName
* The name of the created archive.
*
* Only relevant if `$sendHttpHeaders = true`.
*
* @param string $contentDisposition
* HTTP Content-Disposition
*
* Only relevant if `sendHttpHeaders = true`.
*
* @param string $contentType
* HTTP Content Type
*
* Only relevant if `sendHttpHeaders = true`.
*
* @param bool $flushOutput
* Enable flush after every write to output stream.
*
* @return self
*/
public function __construct(
private OperationMode $operationMode = OperationMode::NORMAL,
private readonly string $comment = '',
$outputStream = null,
private readonly CompressionMethod $defaultCompressionMethod = CompressionMethod::DEFLATE,
private readonly int $defaultDeflateLevel = 6,
private readonly bool $enableZip64 = true,
private readonly bool $defaultEnableZeroHeader = true,
private bool $sendHttpHeaders = true,
?Closure $httpHeaderCallback = null,
private readonly ?string $outputName = null,
private readonly string $contentDisposition = 'attachment',
private readonly string $contentType = 'application/x-zip',
private bool $flushOutput = false,
) {
$this->outputStream = self::normalizeStream($outputStream);
$this->httpHeaderCallback = $httpHeaderCallback ?? header(...);
}
/**
* Add a file to the archive.
*
* ##### File Options
*
* See {@see addFileFromPsr7Stream()}
*
* ##### Examples
*
* ```php
* // add a file named 'world.txt'
* $zip->addFile(fileName: 'world.txt', data: 'Hello World!');
*
* // add a file named 'bar.jpg' with a comment and a last-modified
* // time of two hours ago
* $zip->addFile(
* fileName: 'bar.jpg',
* data: $data,
* comment: 'this is a comment about bar.jpg',
* lastModificationDateTime: new DateTime('2 hours ago'),
* );
* ```
*
* @param string $data
*
* contents of file
*/
public function addFile(
string $fileName,
string $data,
string $comment = '',
?CompressionMethod $compressionMethod = null,
?int $deflateLevel = null,
?DateTimeInterface $lastModificationDateTime = null,
?int $maxSize = null,
?int $exactSize = null,
?bool $enableZeroHeader = null,
): void {
$this->addFileFromCallback(
fileName: $fileName,
callback: fn () => $data,
comment: $comment,
compressionMethod: $compressionMethod,
deflateLevel: $deflateLevel,
lastModificationDateTime: $lastModificationDateTime,
maxSize: $maxSize,
exactSize: $exactSize,
enableZeroHeader: $enableZeroHeader,
);
}
/**
* Add a file at path to the archive.
*
* ##### File Options
*
* See {@see addFileFromPsr7Stream()}
*
* ###### Examples
*
* ```php
* // add a file named 'foo.txt' from the local file '/tmp/foo.txt'
* $zip->addFileFromPath(
* fileName: 'foo.txt',
* path: '/tmp/foo.txt',
* );
*
* // add a file named 'bigfile.rar' from the local file
* // '/usr/share/bigfile.rar' with a comment and a last-modified
* // time of two hours ago
* $zip->addFile(
* fileName: 'bigfile.rar',
* path: '/usr/share/bigfile.rar',
* comment: 'this is a comment about bigfile.rar',
* lastModificationDateTime: new DateTime('2 hours ago'),
* );
* ```
*
* @throws \ZipStream\Exception\FileNotFoundException
* @throws \ZipStream\Exception\FileNotReadableException
*/
public function addFileFromPath(
/**
* name of file in archive (including directory path).
*/
string $fileName,
/**
* path to file on disk (note: paths should be encoded using
* UNIX-style forward slashes -- e.g '/path/to/some/file').
*/
string $path,
string $comment = '',
?CompressionMethod $compressionMethod = null,
?int $deflateLevel = null,
?DateTimeInterface $lastModificationDateTime = null,
?int $maxSize = null,
?int $exactSize = null,
?bool $enableZeroHeader = null,
): void {
if (!is_readable($path)) {
if (!file_exists($path)) {
throw new FileNotFoundException($path);
}
throw new FileNotReadableException($path);
}
if ($fileTime = filemtime($path)) {
$lastModificationDateTime ??= (new DateTimeImmutable())->setTimestamp($fileTime);
}
$this->addFileFromCallback(
fileName: $fileName,
callback: function () use ($path) {
$stream = fopen($path, 'rb');
if (!$stream) {
// @codeCoverageIgnoreStart
throw new ResourceActionException('fopen');
// @codeCoverageIgnoreEnd
}
return $stream;
},
comment: $comment,
compressionMethod: $compressionMethod,
deflateLevel: $deflateLevel,
lastModificationDateTime: $lastModificationDateTime,
maxSize: $maxSize,
exactSize: $exactSize,
enableZeroHeader: $enableZeroHeader,
);
}
/**
* Add an open stream (resource) to the archive.
*
* ##### File Options
*
* See {@see addFileFromPsr7Stream()}
*
* ##### Examples
*
* ```php
* // create a temporary file stream and write text to it
* $filePointer = tmpfile();
* fwrite($filePointer, 'The quick brown fox jumped over the lazy dog.');
*
* // add a file named 'streamfile.txt' from the content of the stream
* $archive->addFileFromStream(
* fileName: 'streamfile.txt',
* stream: $filePointer,
* );
* ```
*
* @param resource $stream contents of file as a stream resource
*/
public function addFileFromStream(
string $fileName,
$stream,
string $comment = '',
?CompressionMethod $compressionMethod = null,
?int $deflateLevel = null,
?DateTimeInterface $lastModificationDateTime = null,
?int $maxSize = null,
?int $exactSize = null,
?bool $enableZeroHeader = null,
): void {
$this->addFileFromCallback(
fileName: $fileName,
callback: fn () => $stream,
comment: $comment,
compressionMethod: $compressionMethod,
deflateLevel: $deflateLevel,
lastModificationDateTime: $lastModificationDateTime,
maxSize: $maxSize,
exactSize: $exactSize,
enableZeroHeader: $enableZeroHeader,
);
}
/**
* Add an open stream to the archive.
*
* ##### Examples
*
* ```php
* $stream = $response->getBody();
* // add a file named 'streamfile.txt' from the content of the stream
* $archive->addFileFromPsr7Stream(
* fileName: 'streamfile.txt',
* stream: $stream,
* );
* ```
*
* @param string $fileName
* path of file in archive (including directory)
*
* @param StreamInterface $stream
* contents of file as a stream resource
*
* @param string $comment
* ZIP comment for this file
*
* @param ?CompressionMethod $compressionMethod
* Override `defaultCompressionMethod`
*
* See {@see __construct()}
*
* @param ?int $deflateLevel
* Override `defaultDeflateLevel`
*
* See {@see __construct()}
*
* @param ?DateTimeInterface $lastModificationDateTime
* Set last modification time of file.
*
* Default: `now`
*
* @param ?int $maxSize
* Only read `maxSize` bytes from file.
*
* The file is considered done when either reaching `EOF`
* or the `maxSize`.
*
* @param ?int $exactSize
* Read exactly `exactSize` bytes from file.
* If `EOF` is reached before reading `exactSize` bytes, an error will be
* thrown. The parameter allows for faster size calculations if the `stream`
* does not support `fstat` size or is slow and otherwise known beforehand.
*
* @param ?bool $enableZeroHeader
* Override `defaultEnableZeroHeader`
*
* See {@see __construct()}
*/
public function addFileFromPsr7Stream(
string $fileName,
StreamInterface $stream,
string $comment = '',
?CompressionMethod $compressionMethod = null,
?int $deflateLevel = null,
?DateTimeInterface $lastModificationDateTime = null,
?int $maxSize = null,
?int $exactSize = null,
?bool $enableZeroHeader = null,
): void {
$this->addFileFromCallback(
fileName: $fileName,
callback: fn () => $stream,
comment: $comment,
compressionMethod: $compressionMethod,
deflateLevel: $deflateLevel,
lastModificationDateTime: $lastModificationDateTime,
maxSize: $maxSize,
exactSize: $exactSize,
enableZeroHeader: $enableZeroHeader,
);
}
/**
* Add a file based on a callback.
*
* This is useful when you want to simulate a lot of files without keeping
* all of the file handles open at the same time.
*
* ##### Examples
*
* ```php
* foreach($files as $name => $size) {
* $archive->addFileFromPsr7Stream(
* fileName: 'streamfile.txt',
* exactSize: $size,
* callback: function() use($name): Psr\Http\Message\StreamInterface {
* $response = download($name);
* return $response->getBody();
* }
* );
* }
* ```
*
* @param string $fileName
* path of file in archive (including directory)
*
* @param Closure $callback
* @psalm-param Closure(): (resource|StreamInterface|string) $callback
* A callback to get the file contents in the shape of a PHP stream,
* a Psr StreamInterface implementation, or a string.
*
* @param string $comment
* ZIP comment for this file
*
* @param ?CompressionMethod $compressionMethod
* Override `defaultCompressionMethod`
*
* See {@see __construct()}
*
* @param ?int $deflateLevel
* Override `defaultDeflateLevel`
*
* See {@see __construct()}
*
* @param ?DateTimeInterface $lastModificationDateTime
* Set last modification time of file.
*
* Default: `now`
*
* @param ?int $maxSize
* Only read `maxSize` bytes from file.
*
* The file is considered done when either reaching `EOF`
* or the `maxSize`.
*
* @param ?int $exactSize
* Read exactly `exactSize` bytes from file.
* If `EOF` is reached before reading `exactSize` bytes, an error will be
* thrown. The parameter allows for faster size calculations if the `stream`
* does not support `fstat` size or is slow and otherwise known beforehand.
*
* @param ?bool $enableZeroHeader
* Override `defaultEnableZeroHeader`
*
* See {@see __construct()}
*/
public function addFileFromCallback(
string $fileName,
Closure $callback,
string $comment = '',
?CompressionMethod $compressionMethod = null,
?int $deflateLevel = null,
?DateTimeInterface $lastModificationDateTime = null,
?int $maxSize = null,
?int $exactSize = null,
?bool $enableZeroHeader = null,
): void {
$file = new File(
dataCallback: function () use ($callback, $maxSize) {
$data = $callback();
if(is_resource($data)) {
return $data;
}
if($data instanceof StreamInterface) {
return StreamWrapper::getResource($data);
}
$stream = fopen('php://memory', 'rw+');
if ($stream === false) {
// @codeCoverageIgnoreStart
throw new ResourceActionException('fopen');
// @codeCoverageIgnoreEnd
}
if ($maxSize !== null && fwrite($stream, $data, $maxSize) === false) {
// @codeCoverageIgnoreStart
throw new ResourceActionException('fwrite', $stream);
// @codeCoverageIgnoreEnd
} elseif (fwrite($stream, $data) === false) {
// @codeCoverageIgnoreStart
throw new ResourceActionException('fwrite', $stream);
// @codeCoverageIgnoreEnd
}
if (rewind($stream) === false) {
// @codeCoverageIgnoreStart
throw new ResourceActionException('rewind', $stream);
// @codeCoverageIgnoreEnd
}
return $stream;
},
send: $this->send(...),
recordSentBytes: $this->recordSentBytes(...),
operationMode: $this->operationMode,
fileName: $fileName,
startOffset: $this->offset,
compressionMethod: $compressionMethod ?? $this->defaultCompressionMethod,
comment: $comment,
deflateLevel: $deflateLevel ?? $this->defaultDeflateLevel,
lastModificationDateTime: $lastModificationDateTime ?? new DateTimeImmutable(),
maxSize: $maxSize,
exactSize: $exactSize,
enableZip64: $this->enableZip64,
enableZeroHeader: $enableZeroHeader ?? $this->defaultEnableZeroHeader,
);
if($this->operationMode !== OperationMode::NORMAL) {
$this->recordedSimulation[] = $file;
}
$this->centralDirectoryRecords[] = $file->process();
}
/**
* Add a directory to the archive.
*
* ##### File Options
*
* See {@see addFileFromPsr7Stream()}
*
* ##### Examples
*
* ```php
* // add a directory named 'world/'
* $zip->addFile(fileName: 'world/');
* ```
*/
public function addDirectory(
string $fileName,
string $comment = '',
?DateTimeInterface $lastModificationDateTime = null,
): void {
if (!str_ends_with($fileName, '/')) {
$fileName .= '/';
}
$this->addFile(
fileName: $fileName,
data: '',
comment: $comment,
compressionMethod: CompressionMethod::STORE,
deflateLevel: null,
lastModificationDateTime: $lastModificationDateTime,
maxSize: 0,
exactSize: 0,
enableZeroHeader: false,
);
}
/**
* Executes a previously calculated simulation.
*
* ##### Example
*
* ```php
* $zip = new ZipStream(
* outputName: 'foo.zip',
* operationMode: OperationMode::SIMULATE_STRICT,
* );
*
* $zip->addFile('test.txt', 'Hello World');
*
* $size = $zip->finish();
*
* header('Content-Length: '. $size);
*
* $zip->executeSimulation();
* ```
*/
public function executeSimulation(): void
{
if($this->operationMode !== OperationMode::NORMAL) {
throw new RuntimeException('Zip simulation is not finished.');
}
foreach($this->recordedSimulation as $file) {
$this->centralDirectoryRecords[] = $file->cloneSimulationExecution()->process();
}
$this->finish();
}
/**
* Write zip footer to stream.
*
* The clase is left in an unusable state after `finish`.
*
* ##### Example
*
* ```php
* // write footer to stream
* $zip->finish();
* ```
*/
public function finish(): int
{
$centralDirectoryStartOffsetOnDisk = $this->offset;
$sizeOfCentralDirectory = 0;
// add trailing cdr file records
foreach ($this->centralDirectoryRecords as $centralDirectoryRecord) {
$this->send($centralDirectoryRecord);
$sizeOfCentralDirectory += strlen($centralDirectoryRecord);
}
// Add 64bit headers (if applicable)
if (count($this->centralDirectoryRecords) >= 0xFFFF ||
$centralDirectoryStartOffsetOnDisk > 0xFFFFFFFF ||
$sizeOfCentralDirectory > 0xFFFFFFFF) {
if (!$this->enableZip64) {
throw new OverflowException();
}
$this->send(Zip64\EndOfCentralDirectory::generate(
versionMadeBy: self::ZIP_VERSION_MADE_BY,
versionNeededToExtract: Version::ZIP64->value,
numberOfThisDisk: 0,
numberOfTheDiskWithCentralDirectoryStart: 0,
numberOfCentralDirectoryEntriesOnThisDisk: count($this->centralDirectoryRecords),
numberOfCentralDirectoryEntries: count($this->centralDirectoryRecords),
sizeOfCentralDirectory: $sizeOfCentralDirectory,
centralDirectoryStartOffsetOnDisk: $centralDirectoryStartOffsetOnDisk,
extensibleDataSector: '',
));
$this->send(Zip64\EndOfCentralDirectoryLocator::generate(
numberOfTheDiskWithZip64CentralDirectoryStart: 0x00,
zip64centralDirectoryStartOffsetOnDisk: $centralDirectoryStartOffsetOnDisk + $sizeOfCentralDirectory,
totalNumberOfDisks: 1,
));
}
// add trailing cdr eof record
$numberOfCentralDirectoryEntries = min(count($this->centralDirectoryRecords), 0xFFFF);
$this->send(EndOfCentralDirectory::generate(
numberOfThisDisk: 0x00,
numberOfTheDiskWithCentralDirectoryStart: 0x00,
numberOfCentralDirectoryEntriesOnThisDisk: $numberOfCentralDirectoryEntries,
numberOfCentralDirectoryEntries: $numberOfCentralDirectoryEntries,
sizeOfCentralDirectory: min($sizeOfCentralDirectory, 0xFFFFFFFF),
centralDirectoryStartOffsetOnDisk: min($centralDirectoryStartOffsetOnDisk, 0xFFFFFFFF),
zipFileComment: $this->comment,
));
$size = $this->offset;
// The End
$this->clear();
return $size;
}
/**
* @param StreamInterface|resource|null $outputStream
* @return resource
*/
private static function normalizeStream($outputStream)
{
if ($outputStream instanceof StreamInterface) {
return StreamWrapper::getResource($outputStream);
}
if (is_resource($outputStream)) {
return $outputStream;
}
return fopen('php://output', 'wb');
}
/**
* Record sent bytes
*/
private function recordSentBytes(int $sentBytes): void
{
$this->offset += $sentBytes;
}
/**
* Send string, sending HTTP headers if necessary.
* Flush output after write if configure option is set.
*/
private function send(string $data): void
{
if (!$this->ready) {
throw new RuntimeException('Archive is already finished');
}
if ($this->operationMode === OperationMode::NORMAL && $this->sendHttpHeaders) {
$this->sendHttpHeaders();
$this->sendHttpHeaders = false;
}
$this->recordSentBytes(strlen($data));
if ($this->operationMode === OperationMode::NORMAL) {
if (fwrite($this->outputStream, $data) === false) {
throw new ResourceActionException('fwrite', $this->outputStream);
}
if ($this->flushOutput) {
// flush output buffer if it is on and flushable
$status = ob_get_status();
if (isset($status['flags']) && is_int($status['flags']) && ($status['flags'] & PHP_OUTPUT_HANDLER_FLUSHABLE)) {
ob_flush();
}
// Flush system buffers after flushing userspace output buffer
flush();
}
}
}
/**
* Send HTTP headers for this stream.
*/
private function sendHttpHeaders(): void
{
// grab content disposition
$disposition = $this->contentDisposition;
if ($this->outputName) {
// Various different browsers dislike various characters here. Strip them all for safety.
$safeOutput = trim(str_replace(['"', "'", '\\', ';', "\n", "\r"], '', $this->outputName));
// Check if we need to UTF-8 encode the filename
$urlencoded = rawurlencode($safeOutput);
$disposition .= "; filename*=UTF-8''{$urlencoded}";
}
$headers = [
'Content-Type' => $this->contentType,
'Content-Disposition' => $disposition,
'Pragma' => 'public',
'Cache-Control' => 'public, must-revalidate',
'Content-Transfer-Encoding' => 'binary',
];
foreach ($headers as $key => $val) {
($this->httpHeaderCallback)("$key: $val");
}
}
/**
* Clear all internal variables. Note that the stream object is not
* usable after this.
*/
private function clear(): void
{
$this->centralDirectoryRecords = [];
$this->offset = 0;
if($this->operationMode === OperationMode::NORMAL) {
$this->ready = false;
$this->recordedSimulation = [];
} else {
$this->operationMode = OperationMode::NORMAL;
}
}
}