<?php
declare(strict_types=1);
namespace GuzzleHttp\Psr7;
use Psr\Http\Message\RequestInterface;
use Psr\Http\Message\ServerRequestInterface;
use Psr\Http\Message\StreamInterface;
use Psr\Http\Message\UriInterface;
final class Utils
{
/**
* Remove the items given by the keys, case insensitively from the data.
*
* @param (string|int)[] $keys
*/
public static function caselessRemove(array $keys, array $data): array
{
$result = [];
foreach ($keys as &$key) {
$key = strtolower((string) $key);
}
foreach ($data as $k => $v) {
if (!in_array(strtolower((string) $k), $keys)) {
$result[$k] = $v;
}
}
return $result;
}
/**
* Copy the contents of a stream into another stream until the given number
* of bytes have been read.
*
* @param StreamInterface $source Stream to read from
* @param StreamInterface $dest Stream to write to
* @param int $maxLen Maximum number of bytes to read. Pass -1
* to read the entire stream.
*
* @throws \RuntimeException on error.
*/
public static function copyToStream(StreamInterface $source, StreamInterface $dest, int $maxLen = -1): void
{
$bufferSize = 8192;
if ($maxLen === -1) {
while (!$source->eof()) {
if (!$dest->write($source->read($bufferSize))) {
break;
}
}
} else {
$remaining = $maxLen;
while ($remaining > 0 && !$source->eof()) {
$buf = $source->read(min($bufferSize, $remaining));
$len = strlen($buf);
if (!$len) {
break;
}
$remaining -= $len;
$dest->write($buf);
}
}
}
/**
* Copy the contents of a stream into a string until the given number of
* bytes have been read.
*
* @param StreamInterface $stream Stream to read
* @param int $maxLen Maximum number of bytes to read. Pass -1
* to read the entire stream.
*
* @throws \RuntimeException on error.
*/
public static function copyToString(StreamInterface $stream, int $maxLen = -1): string
{
$buffer = '';
if ($maxLen === -1) {
while (!$stream->eof()) {
$buf = $stream->read(1048576);
if ($buf === '') {
break;
}
$buffer .= $buf;
}
return $buffer;
}
$len = 0;
while (!$stream->eof() && $len < $maxLen) {
$buf = $stream->read($maxLen - $len);
if ($buf === '') {
break;
}
$buffer .= $buf;
$len = strlen($buffer);
}
return $buffer;
}
/**
* Calculate a hash of a stream.
*
* This method reads the entire stream to calculate a rolling hash, based
* on PHP's `hash_init` functions.
*
* @param StreamInterface $stream Stream to calculate the hash for
* @param string $algo Hash algorithm (e.g. md5, crc32, etc)
* @param bool $rawOutput Whether or not to use raw output
*
* @throws \RuntimeException on error.
*/
public static function hash(StreamInterface $stream, string $algo, bool $rawOutput = false): string
{
$pos = $stream->tell();
if ($pos > 0) {
$stream->rewind();
}
$ctx = hash_init($algo);
while (!$stream->eof()) {
hash_update($ctx, $stream->read(1048576));
}
$out = hash_final($ctx, $rawOutput);
$stream->seek($pos);
return $out;
}
/**
* Clone and modify a request with the given changes.
*
* This method is useful for reducing the number of clones needed to mutate
* a message.
*
* The changes can be one of:
* - method: (string) Changes the HTTP method.
* - set_headers: (array) Sets the given headers.
* - remove_headers: (array) Remove the given headers.
* - body: (mixed) Sets the given body.
* - uri: (UriInterface) Set the URI.
* - query: (string) Set the query string value of the URI.
* - version: (string) Set the protocol version.
*
* @param RequestInterface $request Request to clone and modify.
* @param array $changes Changes to apply.
*/
public static function modifyRequest(RequestInterface $request, array $changes): RequestInterface
{
if (!$changes) {
return $request;
}
$headers = $request->getHeaders();
if (!isset($changes['uri'])) {
$uri = $request->getUri();
} else {
// Remove the host header if one is on the URI
if ($host = $changes['uri']->getHost()) {
$changes['set_headers']['Host'] = $host;
if ($port = $changes['uri']->getPort()) {
$standardPorts = ['http' => 80, 'https' => 443];
$scheme = $changes['uri']->getScheme();
if (isset($standardPorts[$scheme]) && $port != $standardPorts[$scheme]) {
$changes['set_headers']['Host'] .= ':'.$port;
}
}
}
$uri = $changes['uri'];
}
if (!empty($changes['remove_headers'])) {
$headers = self::caselessRemove($changes['remove_headers'], $headers);
}
if (!empty($changes['set_headers'])) {
$headers = self::caselessRemove(array_keys($changes['set_headers']), $headers);
$headers = $changes['set_headers'] + $headers;
}
if (isset($changes['query'])) {
$uri = $uri->withQuery($changes['query']);
}
if ($request instanceof ServerRequestInterface) {
$new = (new ServerRequest(
$changes['method'] ?? $request->getMethod(),
$uri,
$headers,
$changes['body'] ?? $request->getBody(),
$changes['version'] ?? $request->getProtocolVersion(),
$request->getServerParams()
))
->withParsedBody($request->getParsedBody())
->withQueryParams($request->getQueryParams())
->withCookieParams($request->getCookieParams())
->withUploadedFiles($request->getUploadedFiles());
foreach ($request->getAttributes() as $key => $value) {
$new = $new->withAttribute($key, $value);
}
return $new;
}
return new Request(
$changes['method'] ?? $request->getMethod(),
$uri,
$headers,
$changes['body'] ?? $request->getBody(),
$changes['version'] ?? $request->getProtocolVersion()
);
}
/**
* Read a line from the stream up to the maximum allowed buffer length.
*
* @param StreamInterface $stream Stream to read from
* @param int|null $maxLength Maximum buffer length
*/
public static function readLine(StreamInterface $stream, int $maxLength = null): string
{
$buffer = '';
$size = 0;
while (!$stream->eof()) {
if ('' === ($byte = $stream->read(1))) {
return $buffer;
}
$buffer .= $byte;
// Break when a new line is found or the max length - 1 is reached
if ($byte === "\n" || ++$size === $maxLength - 1) {
break;
}
}
return $buffer;
}
/**
* Create a new stream based on the input type.
*
* Options is an associative array that can contain the following keys:
* - metadata: Array of custom metadata.
* - size: Size of the stream.
*
* This method accepts the following `$resource` types:
* - `Psr\Http\Message\StreamInterface`: Returns the value as-is.
* - `string`: Creates a stream object that uses the given string as the contents.
* - `resource`: Creates a stream object that wraps the given PHP stream resource.
* - `Iterator`: If the provided value implements `Iterator`, then a read-only
* stream object will be created that wraps the given iterable. Each time the
* stream is read from, data from the iterator will fill a buffer and will be
* continuously called until the buffer is equal to the requested read size.
* Subsequent read calls will first read from the buffer and then call `next`
* on the underlying iterator until it is exhausted.
* - `object` with `__toString()`: If the object has the `__toString()` method,
* the object will be cast to a string and then a stream will be returned that
* uses the string value.
* - `NULL`: When `null` is passed, an empty stream object is returned.
* - `callable` When a callable is passed, a read-only stream object will be
* created that invokes the given callable. The callable is invoked with the
* number of suggested bytes to read. The callable can return any number of
* bytes, but MUST return `false` when there is no more data to return. The
* stream object that wraps the callable will invoke the callable until the
* number of requested bytes are available. Any additional bytes will be
* buffered and used in subsequent reads.
*
* @param resource|string|int|float|bool|StreamInterface|callable|\Iterator|null $resource Entity body data
* @param array{size?: int, metadata?: array} $options Additional options
*
* @throws \InvalidArgumentException if the $resource arg is not valid.
*/
public static function streamFor($resource = '', array $options = []): StreamInterface
{
if (is_scalar($resource)) {
$stream = self::tryFopen('php://temp', 'r+');
if ($resource !== '') {
fwrite($stream, (string) $resource);
fseek($stream, 0);
}
return new Stream($stream, $options);
}
switch (gettype($resource)) {
case 'resource':
/*
* The 'php://input' is a special stream with quirks and inconsistencies.
* We avoid using that stream by reading it into php://temp
*/
/** @var resource $resource */
if ((\stream_get_meta_data($resource)['uri'] ?? '') === 'php://input') {
$stream = self::tryFopen('php://temp', 'w+');
stream_copy_to_stream($resource, $stream);
fseek($stream, 0);
$resource = $stream;
}
return new Stream($resource, $options);
case 'object':
/** @var object $resource */
if ($resource instanceof StreamInterface) {
return $resource;
} elseif ($resource instanceof \Iterator) {
return new PumpStream(function () use ($resource) {
if (!$resource->valid()) {
return false;
}
$result = $resource->current();
$resource->next();
return $result;
}, $options);
} elseif (method_exists($resource, '__toString')) {
return self::streamFor((string) $resource, $options);
}
break;
case 'NULL':
return new Stream(self::tryFopen('php://temp', 'r+'), $options);
}
if (is_callable($resource)) {
return new PumpStream($resource, $options);
}
throw new \InvalidArgumentException('Invalid resource type: '.gettype($resource));
}
/**
* Safely opens a PHP stream resource using a filename.
*
* When fopen fails, PHP normally raises a warning. This function adds an
* error handler that checks for errors and throws an exception instead.
*
* @param string $filename File to open
* @param string $mode Mode used to open the file
*
* @return resource
*
* @throws \RuntimeException if the file cannot be opened
*/
public static function tryFopen(string $filename, string $mode)
{
$ex = null;
set_error_handler(static function (int $errno, string $errstr) use ($filename, $mode, &$ex): bool {
$ex = new \RuntimeException(sprintf(
'Unable to open "%s" using mode "%s": %s',
$filename,
$mode,
$errstr
));
return true;
});
try {
/** @var resource $handle */
$handle = fopen($filename, $mode);
} catch (\Throwable $e) {
$ex = new \RuntimeException(sprintf(
'Unable to open "%s" using mode "%s": %s',
$filename,
$mode,
$e->getMessage()
), 0, $e);
}
restore_error_handler();
if ($ex) {
/** @var $ex \RuntimeException */
throw $ex;
}
return $handle;
}
/**
* Safely gets the contents of a given stream.
*
* When stream_get_contents fails, PHP normally raises a warning. This
* function adds an error handler that checks for errors and throws an
* exception instead.
*
* @param resource $stream
*
* @throws \RuntimeException if the stream cannot be read
*/
public static function tryGetContents($stream): string
{
$ex = null;
set_error_handler(static function (int $errno, string $errstr) use (&$ex): bool {
$ex = new \RuntimeException(sprintf(
'Unable to read stream contents: %s',
$errstr
));
return true;
});
try {
/** @var string|false $contents */
$contents = stream_get_contents($stream);
if ($contents === false) {
$ex = new \RuntimeException('Unable to read stream contents');
}
} catch (\Throwable $e) {
$ex = new \RuntimeException(sprintf(
'Unable to read stream contents: %s',
$e->getMessage()
), 0, $e);
}
restore_error_handler();
if ($ex) {
/** @var $ex \RuntimeException */
throw $ex;
}
return $contents;
}
/**
* Returns a UriInterface for the given value.
*
* This function accepts a string or UriInterface and returns a
* UriInterface for the given value. If the value is already a
* UriInterface, it is returned as-is.
*
* @param string|UriInterface $uri
*
* @throws \InvalidArgumentException
*/
public static function uriFor($uri): UriInterface
{
if ($uri instanceof UriInterface) {
return $uri;
}
if (is_string($uri)) {
return new Uri($uri);
}
throw new \InvalidArgumentException('URI must be a string or UriInterface');
}
}
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FAQ Section
Frequently Asked Questions About NFC Pay
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