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Edit File : Middleware.php \| Size : 15.51 KB
<?php namespace Aws; use Aws\Api\Service; use Aws\Api\Validator; use Aws\Credentials\CredentialsInterface; use Aws\EndpointV2\EndpointProviderV2; use Aws\Exception\AwsException; use Aws\Token\TokenAuthorization; use Aws\Token\TokenInterface; use GuzzleHttp\Promise; use GuzzleHttp\Psr7; use GuzzleHttp\Psr7\LazyOpenStream; use Psr\Http\Message\RequestInterface; final class Middleware { /** * Middleware used to allow a command parameter (e.g., "SourceFile") to * be used to specify the source of data for an upload operation. * * @param Service $api * @param string $bodyParameter * @param string $sourceParameter * * @return callable / public static function sourceFile( Service $api, $bodyParameter = 'Body', $sourceParameter = 'SourceFile' ) { return function (callable $handler) use ( $api, $bodyParameter, $sourceParameter ) { return function ( CommandInterface $command, RequestInterface $request = null) use ( $handler, $api, $bodyParameter, $sourceParameter ) { $operation = $api->getOperation($command->getName()); $source = $command[$sourceParameter]; if ($source !== null && $operation->getInput()->hasMember($bodyParameter) ) { $command[$bodyParameter] = new LazyOpenStream($source, 'r'); unset($command[$sourceParameter]); } return $handler($command, $request); }; }; } /* * Adds a middleware that uses client-side validation. * * @param Service $api API being accessed. * * @return callable / public static function validation(Service $api, Validator $validator = null) { $validator = $validator ?: new Validator(); return function (callable $handler) use ($api, $validator) { return function ( CommandInterface $command, RequestInterface $request = null ) use ($api, $validator, $handler) { if ($api->isModifiedModel()) { $api = new Service( $api->getDefinition(), $api->getProvider() ); } $operation = $api->getOperation($command->getName()); $validator->validate( $command->getName(), $operation->getInput(), $command->toArray() ); return $handler($command, $request); }; }; } /* * Builds an HTTP request for a command. * * @param callable $serializer Function used to serialize a request for a * command. * @param EndpointProviderV2 \| null $endpointProvider * @param array $providerArgs * @return callable / public static function requestBuilder( $serializer, $endpointProvider = null, array $providerArgs = null ) { return function (callable $handler) use ($serializer, $endpointProvider, $providerArgs) { return function (CommandInterface $command) use ($serializer, $handler, $endpointProvider, $providerArgs) { return $handler($command, $serializer($command, $endpointProvider, $providerArgs)); }; }; } /* * Creates a middleware that signs requests for a command. * * @param callable $credProvider Credentials provider function that * returns a promise that is resolved * with a CredentialsInterface object. * @param callable $signatureFunction Function that accepts a Command * object and returns a * SignatureInterface. * * @return callable / public static function signer(callable $credProvider, callable $signatureFunction, $tokenProvider = null) { return function (callable $handler) use ($signatureFunction, $credProvider, $tokenProvider) { return function ( CommandInterface $command, RequestInterface $request ) use ($handler, $signatureFunction, $credProvider, $tokenProvider) { $signer = $signatureFunction($command); if ($signer instanceof TokenAuthorization) { return $tokenProvider()->then( function (TokenInterface $token) use ($handler, $command, $signer, $request) { return $handler( $command, $signer->authorizeRequest($request, $token) ); } ); } else { return $credProvider()->then( function (CredentialsInterface $creds) use ($handler, $command, $signer, $request) { return $handler( $command, $signer->signRequest($request, $creds) ); } ); } }; }; } /* * Creates a middleware that invokes a callback at a given step. * * The tap callback accepts a CommandInterface and RequestInterface as * arguments but is not expected to return a new value or proxy to * downstream middleware. It's simply a way to "tap" into the handler chain * to debug or get an intermediate value. * * @param callable $fn Tap function * * @return callable / public static function tap(callable $fn) { return function (callable $handler) use ($fn) { return function ( CommandInterface $command, RequestInterface $request = null ) use ($handler, $fn) { $fn($command, $request); return $handler($command, $request); }; }; } /* * Middleware wrapper function that retries requests based on the boolean * result of invoking the provided "decider" function. * * If no delay function is provided, a simple implementation of exponential * backoff will be utilized. * * @param callable $decider Function that accepts the number of retries, * a request, [result], and [exception] and * returns true if the command is to be retried. * @param callable $delay Function that accepts the number of retries and * returns the number of milliseconds to delay. * @param bool $stats Whether to collect statistics on retries and the * associated delay. * * @return callable / public static function retry( callable $decider = null, callable $delay = null, $stats = false ) { $decider = $decider ?: RetryMiddleware::createDefaultDecider(); $delay = $delay ?: [RetryMiddleware::class, 'exponentialDelay']; return function (callable $handler) use ($decider, $delay, $stats) { return new RetryMiddleware($decider, $delay, $handler, $stats); }; } /* * Middleware wrapper function that adds an invocation id header to * requests, which is only applied after the build step. * * This is a uniquely generated UUID to identify initial and subsequent * retries as part of a complete request lifecycle. * * @return callable / public static function invocationId() { return function (callable $handler) { return function ( CommandInterface $command, RequestInterface $request ) use ($handler){ return $handler($command, $request->withHeader( 'aws-sdk-invocation-id', md5(uniqid(gethostname(), true)) )); }; }; } /* * Middleware wrapper function that adds a Content-Type header to requests. * This is only done when the Content-Type has not already been set, and the * request body's URI is available. It then checks the file extension of the * URI to determine the mime-type. * * @param array $operations Operations that Content-Type should be added to. * * @return callable / public static function contentType(array $operations) { return function (callable $handler) use ($operations) { return function ( CommandInterface $command, RequestInterface $request = null ) use ($handler, $operations) { if (!$request->hasHeader('Content-Type') && in_array($command->getName(), $operations, true) && ($uri = $request->getBody()->getMetadata('uri')) ) { $request = $request->withHeader( 'Content-Type', Psr7\MimeType::fromFilename($uri) ?: 'application/octet-stream' ); } return $handler($command, $request); }; }; } /* * Middleware wrapper function that adds a trace id header to requests * from clients instantiated in supported Lambda runtime environments. * * The purpose for this header is to track and stop Lambda functions * from being recursively invoked due to misconfigured resources. * * @return callable / public static function recursionDetection() { return function (callable $handler) { return function ( CommandInterface $command, RequestInterface $request ) use ($handler){ $isLambda = getenv('AWS_LAMBDA_FUNCTION_NAME'); $traceId = str_replace('\e', '\x1b', getenv('_X_AMZN_TRACE_ID')); if ($isLambda && $traceId) { if (!$request->hasHeader('X-Amzn-Trace-Id')) { $ignoreChars = ['=', ';', ':', '+', '&', '[', ']', '{', '}', '"', '\'', ',']; $traceIdEncoded = rawurlencode(stripcslashes($traceId)); foreach($ignoreChars as $char) { $encodedChar = rawurlencode($char); $traceIdEncoded = str_replace($encodedChar, $char, $traceIdEncoded); } return $handler($command, $request->withHeader( 'X-Amzn-Trace-Id', $traceIdEncoded )); } } return $handler($command, $request); }; }; } /* * Tracks command and request history using a history container. * * This is useful for testing. * * @param History $history History container to store entries. * * @return callable / public static function history(History $history) { return function (callable $handler) use ($history) { return function ( CommandInterface $command, RequestInterface $request = null ) use ($handler, $history) { $ticket = $history->start($command, $request); return $handler($command, $request) ->then( function ($result) use ($history, $ticket) { $history->finish($ticket, $result); return $result; }, function ($reason) use ($history, $ticket) { $history->finish($ticket, $reason); return Promise\Create::rejectionFor($reason); } ); }; }; } /* * Creates a middleware that applies a map function to requests as they * pass through the middleware. * * @param callable $f Map function that accepts a RequestInterface and * returns a RequestInterface. * * @return callable / public static function mapRequest(callable $f) { return function (callable $handler) use ($f) { return function ( CommandInterface $command, RequestInterface $request = null ) use ($handler, $f) { return $handler($command, $f($request)); }; }; } /* * Creates a middleware that applies a map function to commands as they * pass through the middleware. * * @param callable $f Map function that accepts a command and returns a * command. * * @return callable / public static function mapCommand(callable $f) { return function (callable $handler) use ($f) { return function ( CommandInterface $command, RequestInterface $request = null ) use ($handler, $f) { return $handler($f($command), $request); }; }; } /* * Creates a middleware that applies a map function to results. * * @param callable $f Map function that accepts an Aws\ResultInterface and * returns an Aws\ResultInterface. * * @return callable */ public static function mapResult(callable $f) { return function (callable $handler) use ($f) { return function ( CommandInterface $command, RequestInterface $request = null ) use ($handler, $f) { return $handler($command, $request)->then($f); }; }; } public static function timer() { return function (callable $handler) { return function ( CommandInterface $command, RequestInterface $request = null ) use ($handler) { $start = microtime(true); return $handler($command, $request) ->then( function (ResultInterface $res) use ($start) { if (!isset($res['@metadata'])) { $res['@metadata'] = []; } if (!isset($res['@metadata']['transferStats'])) { $res['@metadata']['transferStats'] = []; } $res['@metadata']['transferStats']['total_time'] = microtime(true) - $start; return $res; }, function ($err) use ($start) { if ($err instanceof AwsException) { $err->setTransferInfo([ 'total_time' => microtime(true) - $start, ] + $err->getTransferInfo()); } return Promise\Create::rejectionFor($err); } ); }; }; } } Back

Edit File : Middleware.php | Size : 15.51 KB

<?php
namespace Aws;

use Aws\Api\Service;
use Aws\Api\Validator;
use Aws\Credentials\CredentialsInterface;
use Aws\EndpointV2\EndpointProviderV2;
use Aws\Exception\AwsException;
use Aws\Token\TokenAuthorization;
use Aws\Token\TokenInterface;
use GuzzleHttp\Promise;
use GuzzleHttp\Psr7;
use GuzzleHttp\Psr7\LazyOpenStream;
use Psr\Http\Message\RequestInterface;

final class Middleware
{
    /**
     * Middleware used to allow a command parameter (e.g., "SourceFile") to
     * be used to specify the source of data for an upload operation.
     *
     * @param Service $api
     * @param string  $bodyParameter
     * @param string  $sourceParameter
     *
     * @return callable
     */
    public static function sourceFile(
        Service $api,
        $bodyParameter = 'Body',
        $sourceParameter = 'SourceFile'
    ) {
        return function (callable $handler) use (
            $api,
            $bodyParameter,
            $sourceParameter
        ) {
            return function (
                CommandInterface $command,
                RequestInterface $request = null)
            use (
                $handler,
                $api,
                $bodyParameter,
                $sourceParameter
            ) {
                $operation = $api->getOperation($command->getName());
                $source = $command[$sourceParameter];

if ($source !== null
                    && $operation->getInput()->hasMember($bodyParameter)
                ) {
                    $command[$bodyParameter] = new LazyOpenStream($source, 'r');
                    unset($command[$sourceParameter]);
                }

return $handler($command, $request);
            };
        };
    }

/**
     * Adds a middleware that uses client-side validation.
     *
     * @param Service $api API being accessed.
     *
     * @return callable
     */
    public static function validation(Service $api, Validator $validator = null)
    {
        $validator = $validator ?: new Validator();
        return function (callable $handler) use ($api, $validator) {
            return function (
                CommandInterface $command,
                RequestInterface $request = null
            ) use ($api, $validator, $handler) {
                if ($api->isModifiedModel()) {
                    $api = new Service(
                        $api->getDefinition(),
                        $api->getProvider()
                    );
                }
                $operation = $api->getOperation($command->getName());
                $validator->validate(
                    $command->getName(),
                    $operation->getInput(),
                    $command->toArray()
                );
                return $handler($command, $request);
            };
        };
    }

/**
     * Builds an HTTP request for a command.
     *
     * @param callable $serializer Function used to serialize a request for a
     *                             command.
     * @param EndpointProviderV2 | null $endpointProvider
     * @param array $providerArgs
     * @return callable
     */
    public static function requestBuilder(
        $serializer,
        $endpointProvider = null,
        array $providerArgs = null
    )
    {
        return function (callable $handler) use ($serializer, $endpointProvider, $providerArgs) {
            return function (CommandInterface $command) use ($serializer, $handler, $endpointProvider, $providerArgs) {
                return $handler($command, $serializer($command, $endpointProvider, $providerArgs));
            };
        };
    }

/**
     * Creates a middleware that signs requests for a command.
     *
     * @param callable $credProvider      Credentials provider function that
     *                                    returns a promise that is resolved
     *                                    with a CredentialsInterface object.
     * @param callable $signatureFunction Function that accepts a Command
     *                                    object and returns a
     *                                    SignatureInterface.
     *
     * @return callable
     */
    public static function signer(callable $credProvider, callable $signatureFunction, $tokenProvider = null)
    {
        return function (callable $handler) use ($signatureFunction, $credProvider, $tokenProvider) {
            return function (
                CommandInterface $command,
                RequestInterface $request
            ) use ($handler, $signatureFunction, $credProvider, $tokenProvider) {
                $signer = $signatureFunction($command);
                if ($signer instanceof TokenAuthorization) {
                    return $tokenProvider()->then(
                        function (TokenInterface $token)
                        use ($handler, $command, $signer, $request) {
                            return $handler(
                                $command,
                                $signer->authorizeRequest($request, $token)
                            );
                        }
                    );
                } else {
                    return $credProvider()->then(
                        function (CredentialsInterface $creds)
                        use ($handler, $command, $signer, $request) {
                            return $handler(
                                $command,
                                $signer->signRequest($request, $creds)
                            );
                        }
                    );
                }
            };
        };
    }

/**
     * Creates a middleware that invokes a callback at a given step.
     *
     * The tap callback accepts a CommandInterface and RequestInterface as
     * arguments but is not expected to return a new value or proxy to
     * downstream middleware. It's simply a way to "tap" into the handler chain
     * to debug or get an intermediate value.
     *
     * @param callable $fn Tap function
     *
     * @return callable
     */
    public static function tap(callable $fn)
    {
        return function (callable $handler) use ($fn) {
            return function (
                CommandInterface $command,
                RequestInterface $request = null
            ) use ($handler, $fn) {
                $fn($command, $request);
                return $handler($command, $request);
            };
        };
    }

/**
     * Middleware wrapper function that retries requests based on the boolean
     * result of invoking the provided "decider" function.
     *
     * If no delay function is provided, a simple implementation of exponential
     * backoff will be utilized.
     *
     * @param callable $decider Function that accepts the number of retries,
     *                          a request, [result], and [exception] and
     *                          returns true if the command is to be retried.
     * @param callable $delay   Function that accepts the number of retries and
     *                          returns the number of milliseconds to delay.
     * @param bool $stats       Whether to collect statistics on retries and the
     *                          associated delay.
     *
     * @return callable
     */
    public static function retry(
        callable $decider = null,
        callable $delay = null,
        $stats = false
    ) {
        $decider = $decider ?: RetryMiddleware::createDefaultDecider();
        $delay = $delay ?: [RetryMiddleware::class, 'exponentialDelay'];

return function (callable $handler) use ($decider, $delay, $stats) {
            return new RetryMiddleware($decider, $delay, $handler, $stats);
        };
    }
    /**
     * Middleware wrapper function that adds an invocation id header to
     * requests, which is only applied after the build step.
     *
     * This is a uniquely generated UUID to identify initial and subsequent
     * retries as part of a complete request lifecycle.
     *
     * @return callable
     */
    public static function invocationId()
    {
        return function (callable $handler) {
            return function (
                CommandInterface $command,
                RequestInterface $request
            ) use ($handler){
                return $handler($command, $request->withHeader(
                    'aws-sdk-invocation-id',
                    md5(uniqid(gethostname(), true))
                ));
            };
        };
    }
    /**
     * Middleware wrapper function that adds a Content-Type header to requests.
     * This is only done when the Content-Type has not already been set, and the
     * request body's URI is available. It then checks the file extension of the
     * URI to determine the mime-type.
     *
     * @param array $operations Operations that Content-Type should be added to.
     *
     * @return callable
     */
    public static function contentType(array $operations)
    {
        return function (callable $handler) use ($operations) {
            return function (
                CommandInterface $command,
                RequestInterface $request = null
            ) use ($handler, $operations) {
                if (!$request->hasHeader('Content-Type')
                    && in_array($command->getName(), $operations, true)
                    && ($uri = $request->getBody()->getMetadata('uri'))
                ) {
                    $request = $request->withHeader(
                        'Content-Type',
                        Psr7\MimeType::fromFilename($uri) ?: 'application/octet-stream'
                    );
                }

return $handler($command, $request);
            };
        };
    }
    /**
     * Middleware wrapper function that adds a trace id header to requests
     * from clients instantiated in supported Lambda runtime environments.
     *
     * The purpose for this header is to track and stop Lambda functions
     * from being recursively invoked due to misconfigured resources.
     *
     * @return callable
     */
    public static function recursionDetection()
    {
        return function (callable $handler) {
            return function (
                CommandInterface $command,
                RequestInterface $request
            ) use ($handler){
                $isLambda = getenv('AWS_LAMBDA_FUNCTION_NAME');
                $traceId = str_replace('\e', '\x1b', getenv('_X_AMZN_TRACE_ID'));

if ($isLambda && $traceId) {
                    if (!$request->hasHeader('X-Amzn-Trace-Id')) {
                        $ignoreChars = ['=', ';', ':', '+', '&', '[', ']', '{', '}', '"', '\'', ','];
                        $traceIdEncoded = rawurlencode(stripcslashes($traceId));

foreach($ignoreChars as $char) {
                            $encodedChar = rawurlencode($char);
                            $traceIdEncoded = str_replace($encodedChar, $char,  $traceIdEncoded);
                        }

return $handler($command, $request->withHeader(
                            'X-Amzn-Trace-Id',
                            $traceIdEncoded
                        ));
                    }
                }
                return $handler($command, $request);
            };
        };
    }
    /**
     * Tracks command and request history using a history container.
     *
     * This is useful for testing.
     *
     * @param History $history History container to store entries.
     *
     * @return callable
     */
    public static function history(History $history)
    {
        return function (callable $handler) use ($history) {
            return function (
                CommandInterface $command,
                RequestInterface $request = null
            ) use ($handler, $history) {
                $ticket = $history->start($command, $request);
                return $handler($command, $request)
                    ->then(
                        function ($result) use ($history, $ticket) {
                            $history->finish($ticket, $result);
                            return $result;
                        },
                        function ($reason) use ($history, $ticket) {
                            $history->finish($ticket, $reason);
                            return Promise\Create::rejectionFor($reason);
                        }
                    );
            };
        };
    }

/**
     * Creates a middleware that applies a map function to requests as they
     * pass through the middleware.
     *
     * @param callable $f Map function that accepts a RequestInterface and
     *                    returns a RequestInterface.
     *
     * @return callable
     */
    public static function mapRequest(callable $f)
    {
        return function (callable $handler) use ($f) {
            return function (
                CommandInterface $command,
                RequestInterface $request = null
            ) use ($handler, $f) {
                return $handler($command, $f($request));
            };
        };
    }

/**
     * Creates a middleware that applies a map function to commands as they
     * pass through the middleware.
     *
     * @param callable $f Map function that accepts a command and returns a
     *                    command.
     *
     * @return callable
     */
    public static function mapCommand(callable $f)
    {
        return function (callable $handler) use ($f) {
            return function (
                CommandInterface $command,
                RequestInterface $request = null
            ) use ($handler, $f) {
                return $handler($f($command), $request);
            };
        };
    }

/**
     * Creates a middleware that applies a map function to results.
     *
     * @param callable $f Map function that accepts an Aws\ResultInterface and
     *                    returns an Aws\ResultInterface.
     *
     * @return callable
     */
    public static function mapResult(callable $f)
    {
        return function (callable $handler) use ($f) {
            return function (
                CommandInterface $command,
                RequestInterface $request = null
            ) use ($handler, $f) {
                return $handler($command, $request)->then($f);
            };
        };
    }

public static function timer()
    {
        return function (callable $handler) {
            return function (
                CommandInterface $command,
                RequestInterface $request = null
            ) use ($handler) {
                $start = microtime(true);
                return $handler($command, $request)
                    ->then(
                        function (ResultInterface $res) use ($start) {
                            if (!isset($res['@metadata'])) {
                                $res['@metadata'] = [];
                            }
                            if (!isset($res['@metadata']['transferStats'])) {
                                $res['@metadata']['transferStats'] = [];
                            }

$res['@metadata']['transferStats']['total_time']
                                = microtime(true) - $start;

return $res;
                        },
                        function ($err) use ($start) {
                            if ($err instanceof AwsException) {
                                $err->setTransferInfo([
                                    'total_time' => microtime(true) - $start,
                                ] + $err->getTransferInfo());
                            }
                            return Promise\Create::rejectionFor($err);
                        }
                    );
            };
        };
    }
}

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