StreamProviderWrapper::_loadStreamProvider() - Code Metrics - Inspection of "Merge pull request #62 from c-harris/master" - Algo-Web/POData - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( d03abb...fe3c08 )

by Alex

created 2017-02-20 15:01 UTC

StreamProviderWrapper::_loadStreamProvider() A

↳ Parent: StreamProviderWrapper

Complexity

Conditions	4
Paths	3

Size

Total Lines	11
Code Lines	6

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
dl	0
loc	11
rs	9.2
c	0
b	0
f	0
cc	4
eloc	6
nc	3
nop	0

<?php

namespace POData\Providers\Stream;

use POData\IService;
use POData\Providers\Metadata\ResourceStreamInfo;
use POData\OperationContext\ServiceHost;
use POData\Common\Version;
use POData\Common\ODataException;
use POData\Common\ODataConstants;
use POData\Common\Messages;
use POData\Common\InvalidOperationException;

/**
 * Class StreamProviderWrapper Wrapper over IDSSP and IDSSP2 implementations.
 */
class StreamProviderWrapper
{
    /**
     * Holds reference to the data service instance.
     *
     * @var IService
     */
    private $_service;

    /**
     * Holds reference to the implementation of IStreamProvider or IStreamProvider2.
     *
     *
     * @var IStreamProvider|IStreamProvider2
     */
    private $_streamProvider;

    /**
     * Used to check whether interface implementation modified response content type header or not.
     *
     *
     * @var string|null
     */
    private $_responseContentType;

    /**
     * Used to check whether interface implementation modified ETag header or not.
     *
     * @var string|null
     */
    private $_responseETag;

    /**
     * To set reference to the data service instance.
     *
     * @param IService $service The data service instance
     */
    public function setService(IService $service)
    {
        $this->_service = $service;
    }

    /**
     * To get stream associated with the given media resource.
     *
     * @param object             $entity             The media resource
     * @param ResourceStreamInfo $resourceStreamInfo This will be null if media
     *                                               resource is MLE, if media
     *                                               resource is named
     *                                               stream then will be the
     *                                               ResourceStreamInfo instance
     *                                               holding the details of
     *                                               named stream
     *
     * @return string|null
     */
    public function getReadStream($entity, $resourceStreamInfo)
    {
        $requestETag = null;
        $checkETagForEquality = null;
        $this->_getETagFromHeaders($requestETag, $checkETagForEquality);
        $stream = null;
        try {
            $this->_saveContentTypeAndETag();
            $opContext = $this->_service->getOperationContext();
            if (is_null($resourceStreamInfo)) {
                $this->_loadAndValidateStreamProvider();
                $stream = $this->_streamProvider->getReadStream(
                    $entity,
                    $requestETag,
                    $checkETagForEquality,
                    $opContext
                );
            } else {
                $this->_loadAndValidateStreamProvider2();
                $stream = $this->_streamProvider->getReadStream2(
class A
{
    public function foo() { }
}

class B extends A
{
    public function bar() { }
}

/**
 * @param A|B $x
 */
function someFunction($x)
{
    $x->foo(); // This call is fine as the method exists in A and B.
    $x->bar(); // This method only exists in B and might cause an error.
}
                    $entity,
                    $resourceStreamInfo,
                    $requestETag,
                    $checkETagForEquality,
                    $opContext
                );
            }

            $this->_verifyContentTypeOrETagModified('IDSSP::getReadStream');
        } catch (ODataException $ex) {
            //Check for status code 304 (stream Not Modified)
            if (304 == $ex->getStatusCode()) {
                $eTag = $this->getStreamETag($entity, $resourceStreamInfo);
/** @return stdClass|null */
function mayReturnNull() { }

function doesNotAcceptNull(stdClass $x) { }

// With potential error.
function withoutCheck() {
    $x = mayReturnNull();
    doesNotAcceptNull($x); // Potential error here.
}

// Safe - Alternative 1
function withCheck1() {
    $x = mayReturnNull();
    if ( ! $x instanceof stdClass) {
        throw new \LogicException('$x must be defined.');
    }
    doesNotAcceptNull($x);
}

// Safe - Alternative 2
function withCheck2() {
    $x = mayReturnNull();
    if ($x instanceof stdClass) {
        doesNotAcceptNull($x);
    }
}
                if (!is_null($eTag)) {
                    $this->_service->getHost()->setResponseETag($eTag);
                }
            }
            throw $ex;
        }

        if (null == $stream) {
            if (null == $resourceStreamInfo) {
                // For default streams, we always expect getReadStream()
                // to return a non-null stream.  If we reach here, blow up.
                throw new InvalidOperationException(
                    Messages::streamProviderWrapperInvalidStreamFromGetReadStream()
                );
            } else {
                // For named streams, getReadStream() can return null to indicate
                // that the stream has not been created.
                // 204 == no content
                $this->_service->getHost()->setResponseStatusCode(204);
            }
        }

        return $stream;
    }

    /**
     * Gets the IANA content type (aka media type) of the stream associated with
     * the specified media resource.
     *
     * @param object             $entity             The entity instance
     *                                               (media resource) associated with
     *                                               the stream for which the content
     *                                               type is to be obtained
     * @param ResourceStreamInfo $resourceStreamInfo This will be null if
     *                                               media resource is MLE,
     *                                               if media resource is named
     *                                               stream then will be the
     *                                               ResourceStreamInfo instance
     *                                               holding the details of
     *                                               named stream
     *
     * @return string|null
     */
    public function getStreamContentType($entity, $resourceStreamInfo)

    {
        $contentType = null;
$myVar = 'Value';
$higher = false;

if (rand(1, 6) > 3) {
    $higher = true;
} else {
    $higher = false;
}
        $this->_saveContentTypeAndETag();
        $opContext = $this->_service->getOperationContext();
        if (is_null($resourceStreamInfo)) {
            $this->_loadAndValidateStreamProvider();
            $contentType = $this->_streamProvider->getStreamContentType($entity, $opContext);
            if (is_null($contentType)) {
                throw new InvalidOperationException(
                    Messages::streamProviderWrapperGetStreamContentTypeReturnsEmptyOrNull()
                );
            }
        } else {
            $this->_loadAndValidateStreamProvider2();
            assert($this->_streamProvider instanceof IStreamProvider2);
            $contentType = $this->_streamProvider->getStreamContentType2($entity, $resourceStreamInfo, $opContext);
        }

        $this->_verifyContentTypeOrETagModified('IDSSP::getStreamContentType');

        return $contentType;
    }

    /**
     * Get the ETag of the stream associated with the entity specified.
     *
     * @param object             $entity             The entity instance
     *                                               (media resource) associated
     *                                               with the stream for which
     *                                               the etag is to be obtained
     * @param ResourceStreamInfo $resourceStreamInfo This will be null if
     *                                               media resource is MLE,
     *                                               if media resource is named
     *                                               stream then will be the
     *                                               ResourceStreamInfo
     *                                               instance holding the
     *                                               details of named stream
     *
     * @throws InvalidOperationException
     *
     * @return string Etag
     */
    public function getStreamETag($entity, $resourceStreamInfo)

    {
        $eTag = null;
$myVar = 'Value';
$higher = false;

if (rand(1, 6) > 3) {
    $higher = true;
} else {
    $higher = false;
}
        $this->_saveContentTypeAndETag();
        $opContext = $this->_service->getOperationContext();
        if (is_null($resourceStreamInfo)) {
            $this->_loadAndValidateStreamProvider();
            $eTag = $this->_streamProvider->getStreamETag($entity, $opContext);
        } else {
            $this->_loadAndValidateStreamProvider2();
            assert($this->_streamProvider instanceof IStreamProvider2);
            $eTag = $this->_streamProvider->getStreamETag2($entity, $resourceStreamInfo, $opContext);
        }

        $this->_verifyContentTypeOrETagModified('IDSSP::getStreamETag');
        if (!self::isETagValueValid($eTag, true)) {
            throw new InvalidOperationException(
                Messages::streamProviderWrapperGetStreamETagReturnedInvalidETagFormat()
            );
        }

        return $eTag;
    }

    /**
     * Gets the URI clients should use when making retrieve (ie. GET) requests
     * to the stream.
     *
     * @param object             $entity             The entity instance
     *                                               associated with the
     *                                               stream for which a
     *                                               read stream URI is to
     *                                               be obtained
     * @param ResourceStreamInfo $resourceStreamInfo This will be null
     *                                               if media resource
     *                                               is MLE, if media
     *                                               resource is named
     *                                               stream then will be
     *                                               the ResourceStreamInfo
     *                                               instance holding the
     *                                               details of named stream
     * @param string             $mediaLinkEntryUri  MLE uri
     *
     * @return string
     *
     * @throws InvalidOperationException
     */
    public function getReadStreamUri(
        $entity,
        $resourceStreamInfo,
        $mediaLinkEntryUri
    ) {
        $readStreamUri = null;
$myVar = 'Value';
$higher = false;

if (rand(1, 6) > 3) {
    $higher = true;
} else {
    $higher = false;
}
        $this->_saveContentTypeAndETag();
        $opContext = $this->_service->getOperationContext();
        if (is_null($resourceStreamInfo)) {
            $this->_loadAndValidateStreamProvider();
            $readStreamUri = $this->_streamProvider->getReadStreamUri($entity, $opContext);
        } else {
            $this->_loadAndValidateStreamProvider2();
            assert($this->_streamProvider instanceof IStreamProvider2);
            $readStreamUri = $this->_streamProvider->getReadStreamUri2($entity, $resourceStreamInfo, $opContext);
        }

        $this->_verifyContentTypeOrETagModified('IDSSP::getReadStreamUri');
        if (!is_null($readStreamUri)) {
            try {
                new \POData\Common\Url($readStreamUri);
            } catch (\POData\Common\UrlFormatException $ex) {
                throw new InvalidOperationException(
                    Messages::streamProviderWrapperGetReadStreamUriMustReturnAbsoluteUriOrNull()
                );
            }
        } else {
            if (is_null($resourceStreamInfo)) {
                // For MLEs the content src attribute is
                //required so we cannot return null.
                $readStreamUri = $this->getDefaultStreamEditMediaUri($mediaLinkEntryUri, null);
            }
        }

        // Note if readStreamUri is null, the self link for the
        // named stream will be omitted.
        return $readStreamUri;
    }

    /**
     * Checks the given value is a valid eTag.
     *
     * @param string $etag            eTag to validate
     * @param bool   $allowStrongEtag True if strong eTag is allowed
     *                                False otherwise
     *
     * @return bool
     */
    public static function isETagValueValid($etag, $allowStrongEtag)
    {
        if (is_null($etag) || '*' === $etag) {
            return true;
        }

        // HTTP RFC 2616, section 3.11:
        //   entity-tag = [ weak ] opaque-tag
        //   weak       = "W/"
        //   opaque-tag = quoted-string
        $etagValueStartIndex = 1;
        $eTagLength = strlen($etag);
        $isLastCharDubQuotes = ('"' == $etag[$eTagLength - 1]);

        if (0 === strpos($etag, 'W/"') && $isLastCharDubQuotes) {
            $etagValueStartIndex = 3;
        } elseif (!$allowStrongEtag || '"' != $etag[0] || !$isLastCharDubQuotes) {
            return false;
        }

        for ($i = $etagValueStartIndex; $i < $eTagLength - 1; ++$i) {
            // Format of etag looks something like: W/"etag property values"
            // or "strong etag value" according to HTTP RFC 2616, if someone
            // wants to specify more than 1 etag value, then need to specify
            // something like this: W/"etag values", W/"etag values", ...
            // To make sure only one etag is specified, we need to ensure
            // that if " is part of the key value, it needs to be escaped.
            if ('"' == $etag[$i]) {
                return false;
            }
        }

        return true;
    }

    /**
     * Get ETag header value from request header.
     *
     * @param mixed &$eTag                 On return, this parameter will hold
     *                                     value of IfMatch or IfNoneMatch
     *                                     header, if this header is absent then
     *                                     this parameter will hold NULL
     * @param mixed &$checkETagForEquality On return, this parameter will hold
     *                                     true if IfMatch is present, false if
     *                                     IfNoneMatch header is present, null
     *                                     otherwise
     */
    private function _getETagFromHeaders(&$eTag, &$checkETagForEquality)
    {
        $dataServiceHost = $this->_service->getHost();
        //TODO Do check for mutual exclusion of RequestIfMatch and
        //RequestIfNoneMatch in ServiceHost
        $eTag = $dataServiceHost->getRequestIfMatch();
        if (!is_null($eTag)) {
            $checkETagForEquality = true;

            return;
        }

        $eTag = $dataServiceHost->getRequestIfNoneMatch();
        if (!is_null($eTag)) {
            $checkETagForEquality = false;

            return;
        }

        $checkETagForEquality = null;
    }

    /**
     * Validates that an implementation of IStreamProvider exists and
     * load it.
     *
     *
     * @throws ODataException
     */
    private function _loadAndValidateStreamProvider()
    {
        if (is_null($this->_streamProvider)) {

            $this->_loadStreamProvider();
            if (is_null($this->_streamProvider)) {
                throw ODataException::createInternalServerError(
                    Messages::streamProviderWrapperMustImplementIStreamProviderToSupportStreaming()
                );
            }
        }
    }

    /**
     * Validates that an implementation of IStreamProvider2 exists and
     * load it.
     *
     *
     * @throws ODataException
     */
    private function _loadAndValidateStreamProvider2()
    {
        $maxServiceVersion = $this->_service->getConfiguration()->getMaxDataServiceVersion();
        if ($maxServiceVersion->compare(new Version(3, 0)) < 0) {
            throw ODataException::createInternalServerError(
                Messages::streamProviderWrapperMaxProtocolVersionMustBeV3OrAboveToSupportNamedStreams()
            );
        }

        if (is_null($this->_streamProvider)) {
            $this->_loadStreamProvider();
            if (is_null($this->_streamProvider)) {
                throw ODataException::createInternalServerError(
                    Messages::streamProviderWrapperMustImplementStreamProvider2ToSupportNamedStreams()
                );
            } elseif (!$this->_streamProvider instanceof IStreamProvider2) {
                throw ODataException::createInternalServerError(
                    Messages::streamProviderWrapperInvalidStream2Instance()
                );
            }
        }
    }

    /**
     * Ask data service to load stream provider instance.
     *
     *
     * @throws ODataException
     */
    private function _loadStreamProvider()
    {
        if (is_null($this->_streamProvider)) {
            $this->_streamProvider = $this->_service->getStreamProviderX();
            if (!is_null($this->_streamProvider) && (!$this->_streamProvider instanceof IStreamProvider2)) {
                throw ODataException::createInternalServerError(
                    Messages::streamProviderWrapperInvalidStream2Instance()
                );
            }
        }
    }

    /**
     * Construct the default edit media uri from the given media link entry uri.
     *
     * @param string                    $mediaLinkEntryUri  Uri to the media link entry
     * @param ResourceStreamInfo|null   $resourceStreamInfo Stream info instance, if its
     *                                                      null default stream is assumed
     *
     * @return string Uri to the media resource
     */
    public function getDefaultStreamEditMediaUri($mediaLinkEntryUri, $resourceStreamInfo)
    {
        $base = rtrim($mediaLinkEntryUri, '/') . '/';
        $end = (null == $resourceStreamInfo) ? ODataConstants::URI_VALUE_SEGMENT
            : ltrim($resourceStreamInfo->getName(), '/');
        return $base . $end;
    }

    /**
     * Save value of content type and etag headers before invoking implementor
     * methods.
     */
    private function _saveContentTypeAndETag()
    {
        $this->_responseContentType = $this->_service->getHost()->getResponseContentType();
        $this->_responseETag = $this->_service->getHost()->getResponseETag();

    }

    /**
     * Check whether implementor modified content type or etag header
     * if so throw InvalidOperationException.
     *
     * @param string $methodName NAme of the method
     *
     * @throws InvalidOperationException
     */
    private function _verifyContentTypeOrETagModified($methodName)
    {
        if ($this->_responseContentType !== $this->_service->getHost()->getResponseContentType()
            || $this->_responseETag !== $this->_service->getHost()->getResponseETag()
        ) {
            throw new InvalidOperationException(
                Messages::streamProviderWrapperMustNotSetContentTypeAndEtag($methodName)
            );
        }
    }
}


1		<?php
2
3		namespace POData\Providers\Stream;
4
5		use POData\IService;
6		use POData\Providers\Metadata\ResourceStreamInfo;
7		use POData\OperationContext\ServiceHost;
8		use POData\Common\Version;
9		use POData\Common\ODataException;
10		use POData\Common\ODataConstants;
11		use POData\Common\Messages;
12		use POData\Common\InvalidOperationException;
13
14		/**
15		* Class StreamProviderWrapper Wrapper over IDSSP and IDSSP2 implementations.
16		*/
17		class StreamProviderWrapper
18		{
19		/**
20		* Holds reference to the data service instance.
21		*
22		* @var IService
23		*/
24		private $_service;
25
26		/**
27		* Holds reference to the implementation of IStreamProvider or IStreamProvider2.
28		*
29		*
30		* @var IStreamProvider\|IStreamProvider2
31		*/
32		private $_streamProvider;
33
34		/**
35		* Used to check whether interface implementation modified response content type header or not.
36		*
37		*
38		* @var string\|null
39		*/
40		private $_responseContentType;
41
42		/**
43		* Used to check whether interface implementation modified ETag header or not.
44		*
45		* @var string\|null
46		*/
47		private $_responseETag;
48
49		/**
50		* To set reference to the data service instance.
51		*
52		* @param IService $service The data service instance
53		*/
54		public function setService(IService $service)
55		{
56		$this->_service = $service;
57		}
58
59		/**
60		* To get stream associated with the given media resource.
61		*
62		* @param object $entity The media resource
63		* @param ResourceStreamInfo $resourceStreamInfo This will be null if media
64		* resource is MLE, if media
65		* resource is named
66		* stream then will be the
67		* ResourceStreamInfo instance
68		* holding the details of
69		* named stream
70		*
71		* @return string\|null
72		*/
73		public function getReadStream($entity, $resourceStreamInfo)
74		{
75		$requestETag = null;
76		$checkETagForEquality = null;
77		$this->_getETagFromHeaders($requestETag, $checkETagForEquality);
78		$stream = null;
79		try {
80		$this->_saveContentTypeAndETag();
81		$opContext = $this->_service->getOperationContext();
82		if (is_null($resourceStreamInfo)) {
83		$this->_loadAndValidateStreamProvider();
84		$stream = $this->_streamProvider->getReadStream(
85		$entity,
86		$requestETag,
87		$checkETagForEquality,
88		$opContext
89		);
90		} else {
91		$this->_loadAndValidateStreamProvider2();
92		$stream = $this->_streamProvider->getReadStream2(
		0 ignored issues – show Bug introduced 2016-11-04 10:20 UTC by Report Bug Copy Issue Report The method `getReadStream2` does only exist in `POData\Providers\Stream\IStreamProvider2`, but not in `POData\Providers\Stream\IStreamProvider`. It seems like the method you are trying to call exists only in some of the possible types. Let’s take a look at an example: class A { public function foo() { } } class B extends A { public function bar() { } } /** * @param A\|B $x / function someFunction($x) { $x->foo(); // This call is fine as the method exists in A and B. $x->bar(); // This method only exists in B and might cause an error. } Available Fixes Add an additional type-check: /* * @param A\|B $x / function someFunction($x) { $x->foo(); if ($x instanceof B) { $x->bar(); } } Only allow a single type to be passed if the variable comes from a parameter: function someFunction(B $x) { /* ... */ } Loading history...
93		$entity,
94		$resourceStreamInfo,
95		$requestETag,
96		$checkETagForEquality,
97		$opContext
98		);
99		}
100
101		$this->_verifyContentTypeOrETagModified('IDSSP::getReadStream');
102		} catch (ODataException $ex) {
103		//Check for status code 304 (stream Not Modified)
104		if (304 == $ex->getStatusCode()) {
105		$eTag = $this->getStreamETag($entity, $resourceStreamInfo);
		0 ignored issues – show Bug introduced 2016-11-04 10:20 UTC by Report Bug Copy Issue Report It seems like `$resourceStreamInfo` can be `null`; however, `getStreamETag()` does not accept `null`, maybe add an additional type check? Unless you are absolutely sure that the expression can never be null because of other conditions, we strongly recommend to add an additional type check to your code: /** @return stdClass\|null */ function mayReturnNull() { } function doesNotAcceptNull(stdClass $x) { } // With potential error. function withoutCheck() { $x = mayReturnNull(); doesNotAcceptNull($x); // Potential error here. } // Safe - Alternative 1 function withCheck1() { $x = mayReturnNull(); if ( ! $x instanceof stdClass) { throw new \LogicException('$x must be defined.'); } doesNotAcceptNull($x); } // Safe - Alternative 2 function withCheck2() { $x = mayReturnNull(); if ($x instanceof stdClass) { doesNotAcceptNull($x); } } Loading history...
106		if (!is_null($eTag)) {
107		$this->_service->getHost()->setResponseETag($eTag);
108		}
109		}
110		throw $ex;
111		}
112
113		if (null == $stream) {
114		if (null == $resourceStreamInfo) {
115		// For default streams, we always expect getReadStream()
116		// to return a non-null stream. If we reach here, blow up.
117		throw new InvalidOperationException(
118		Messages::streamProviderWrapperInvalidStreamFromGetReadStream()
119		);
120		} else {
121		// For named streams, getReadStream() can return null to indicate
122		// that the stream has not been created.
123		// 204 == no content
124		$this->_service->getHost()->setResponseStatusCode(204);
125		}
126		}
127
128		return $stream;
129		}
130
131		/**
132		* Gets the IANA content type (aka media type) of the stream associated with
133		* the specified media resource.
134		*
135		* @param object $entity The entity instance
136		* (media resource) associated with
137		* the stream for which the content
138		* type is to be obtained
139		* @param ResourceStreamInfo $resourceStreamInfo This will be null if
140		* media resource is MLE,
141		* if media resource is named
142		* stream then will be the
143		* ResourceStreamInfo instance
144		* holding the details of
145		* named stream
146		*
147		* @return string\|null
148		*/
149	View Code Duplication	public function getStreamContentType($entity, $resourceStreamInfo)
		0 ignored issues – show Duplication introduced 2016-11-04 10:20 UTC by Report Bug Copy Issue Report This method seems to be duplicated in your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history...
150		{
151		$contentType = null;
		0 ignored issues – show Unused Code introduced 2016-11-04 10:20 UTC by Report Bug Copy Issue Report `$contentType` is not used, you could remove the assignment. This check looks for variable assignements that are either overwritten by other assignments or where the variable is not used subsequently. $myVar = 'Value'; $higher = false; if (rand(1, 6) > 3) { $higher = true; } else { $higher = false; } Both the `$myVar` assignment in line 1 and the `$higher` assignment in line 2 are dead. The first because `$myVar` is never used and the second because `$higher` is always overwritten for every possible time line. Loading history...
152		$this->_saveContentTypeAndETag();
153		$opContext = $this->_service->getOperationContext();
154		if (is_null($resourceStreamInfo)) {
155		$this->_loadAndValidateStreamProvider();
156		$contentType = $this->_streamProvider->getStreamContentType($entity, $opContext);
157		if (is_null($contentType)) {
158		throw new InvalidOperationException(
159		Messages::streamProviderWrapperGetStreamContentTypeReturnsEmptyOrNull()
160		);
161		}
162		} else {
163		$this->_loadAndValidateStreamProvider2();
164		assert($this->_streamProvider instanceof IStreamProvider2);
165		$contentType = $this->_streamProvider->getStreamContentType2($entity, $resourceStreamInfo, $opContext);
166		}
167
168		$this->_verifyContentTypeOrETagModified('IDSSP::getStreamContentType');
169
170		return $contentType;
171		}
172
173		/**
174		* Get the ETag of the stream associated with the entity specified.
175		*
176		* @param object $entity The entity instance
177		* (media resource) associated
178		* with the stream for which
179		* the etag is to be obtained
180		* @param ResourceStreamInfo $resourceStreamInfo This will be null if
181		* media resource is MLE,
182		* if media resource is named
183		* stream then will be the
184		* ResourceStreamInfo
185		* instance holding the
186		* details of named stream
187		*
188		* @throws InvalidOperationException
189		*
190		* @return string Etag
191		*/
192	View Code Duplication	public function getStreamETag($entity, $resourceStreamInfo)
		0 ignored issues – show Duplication introduced 2016-11-04 10:20 UTC by Report Bug Copy Issue Report This method seems to be duplicated in your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history...
193		{
194		$eTag = null;
		0 ignored issues – show Unused Code introduced 2016-11-04 10:20 UTC by Report Bug Copy Issue Report `$eTag` is not used, you could remove the assignment. This check looks for variable assignements that are either overwritten by other assignments or where the variable is not used subsequently. $myVar = 'Value'; $higher = false; if (rand(1, 6) > 3) { $higher = true; } else { $higher = false; } Both the `$myVar` assignment in line 1 and the `$higher` assignment in line 2 are dead. The first because `$myVar` is never used and the second because `$higher` is always overwritten for every possible time line. Loading history...
195		$this->_saveContentTypeAndETag();
196		$opContext = $this->_service->getOperationContext();
197		if (is_null($resourceStreamInfo)) {
198		$this->_loadAndValidateStreamProvider();
199		$eTag = $this->_streamProvider->getStreamETag($entity, $opContext);
200		} else {
201		$this->_loadAndValidateStreamProvider2();
202		assert($this->_streamProvider instanceof IStreamProvider2);
203		$eTag = $this->_streamProvider->getStreamETag2($entity, $resourceStreamInfo, $opContext);
204		}
205
206		$this->_verifyContentTypeOrETagModified('IDSSP::getStreamETag');
207		if (!self::isETagValueValid($eTag, true)) {
208		throw new InvalidOperationException(
209		Messages::streamProviderWrapperGetStreamETagReturnedInvalidETagFormat()
210		);
211		}
212
213		return $eTag;
214		}
215
216		/**
217		* Gets the URI clients should use when making retrieve (ie. GET) requests
218		* to the stream.
219		*
220		* @param object $entity The entity instance
221		* associated with the
222		* stream for which a
223		* read stream URI is to
224		* be obtained
225		* @param ResourceStreamInfo $resourceStreamInfo This will be null
226		* if media resource
227		* is MLE, if media
228		* resource is named
229		* stream then will be
230		* the ResourceStreamInfo
231		* instance holding the
232		* details of named stream
233		* @param string $mediaLinkEntryUri MLE uri
234		*
235		* @return string
236		*
237		* @throws InvalidOperationException
238		*/
239		public function getReadStreamUri(
240		$entity,
241		$resourceStreamInfo,
242		$mediaLinkEntryUri
243		) {
244		$readStreamUri = null;
		0 ignored issues – show Unused Code introduced 2016-11-04 10:20 UTC by Report Bug Copy Issue Report `$readStreamUri` is not used, you could remove the assignment. This check looks for variable assignements that are either overwritten by other assignments or where the variable is not used subsequently. $myVar = 'Value'; $higher = false; if (rand(1, 6) > 3) { $higher = true; } else { $higher = false; } Both the `$myVar` assignment in line 1 and the `$higher` assignment in line 2 are dead. The first because `$myVar` is never used and the second because `$higher` is always overwritten for every possible time line. Loading history...
245		$this->_saveContentTypeAndETag();
246		$opContext = $this->_service->getOperationContext();
247		if (is_null($resourceStreamInfo)) {
248		$this->_loadAndValidateStreamProvider();
249		$readStreamUri = $this->_streamProvider->getReadStreamUri($entity, $opContext);
250		} else {
251		$this->_loadAndValidateStreamProvider2();
252		assert($this->_streamProvider instanceof IStreamProvider2);
253		$readStreamUri = $this->_streamProvider->getReadStreamUri2($entity, $resourceStreamInfo, $opContext);
254		}
255
256		$this->_verifyContentTypeOrETagModified('IDSSP::getReadStreamUri');
257		if (!is_null($readStreamUri)) {
258		try {
259		new \POData\Common\Url($readStreamUri);
260		} catch (\POData\Common\UrlFormatException $ex) {
261		throw new InvalidOperationException(
262		Messages::streamProviderWrapperGetReadStreamUriMustReturnAbsoluteUriOrNull()
263		);
264		}
265		} else {
266		if (is_null($resourceStreamInfo)) {
267		// For MLEs the content src attribute is
268		//required so we cannot return null.
269		$readStreamUri = $this->getDefaultStreamEditMediaUri($mediaLinkEntryUri, null);
270		}
271		}
272
273		// Note if readStreamUri is null, the self link for the
274		// named stream will be omitted.
275		return $readStreamUri;
276		}
277
278		/**
279		* Checks the given value is a valid eTag.
280		*
281		* @param string $etag eTag to validate
282		* @param bool $allowStrongEtag True if strong eTag is allowed
283		* False otherwise
284		*
285		* @return bool
286		*/
287		public static function isETagValueValid($etag, $allowStrongEtag)
288		{
289		if (is_null($etag) \|\| '*' === $etag) {
290		return true;
291		}
292
293		// HTTP RFC 2616, section 3.11:
294		// entity-tag = [ weak ] opaque-tag
295		// weak = "W/"
296		// opaque-tag = quoted-string
297		$etagValueStartIndex = 1;
298		$eTagLength = strlen($etag);
299		$isLastCharDubQuotes = ('"' == $etag[$eTagLength - 1]);
300
301		if (0 === strpos($etag, 'W/"') && $isLastCharDubQuotes) {
302		$etagValueStartIndex = 3;
303		} elseif (!$allowStrongEtag \|\| '"' != $etag[0] \|\| !$isLastCharDubQuotes) {
304		return false;
305		}
306
307		for ($i = $etagValueStartIndex; $i < $eTagLength - 1; ++$i) {
308		// Format of etag looks something like: W/"etag property values"
309		// or "strong etag value" according to HTTP RFC 2616, if someone
310		// wants to specify more than 1 etag value, then need to specify
311		// something like this: W/"etag values", W/"etag values", ...
312		// To make sure only one etag is specified, we need to ensure
313		// that if " is part of the key value, it needs to be escaped.
314		if ('"' == $etag[$i]) {
315		return false;
316		}
317		}
318
319		return true;
320		}
321
322		/**
323		* Get ETag header value from request header.
324		*
325		* @param mixed &$eTag On return, this parameter will hold
326		* value of IfMatch or IfNoneMatch
327		* header, if this header is absent then
328		* this parameter will hold NULL
329		* @param mixed &$checkETagForEquality On return, this parameter will hold
330		* true if IfMatch is present, false if
331		* IfNoneMatch header is present, null
332		* otherwise
333		*/
334		private function _getETagFromHeaders(&$eTag, &$checkETagForEquality)
335		{
336		$dataServiceHost = $this->_service->getHost();
337		//TODO Do check for mutual exclusion of RequestIfMatch and
338		//RequestIfNoneMatch in ServiceHost
339		$eTag = $dataServiceHost->getRequestIfMatch();
340		if (!is_null($eTag)) {
341		$checkETagForEquality = true;
342
343		return;
344		}
345
346		$eTag = $dataServiceHost->getRequestIfNoneMatch();
347		if (!is_null($eTag)) {
348		$checkETagForEquality = false;
349
350		return;
351		}
352
353		$checkETagForEquality = null;
354		}
355
356		/**
357		* Validates that an implementation of IStreamProvider exists and
358		* load it.
359		*
360		*
361		* @throws ODataException
362		*/
363		private function _loadAndValidateStreamProvider()
364		{
365		if (is_null($this->_streamProvider)) {
366
367		$this->_loadStreamProvider();
368		if (is_null($this->_streamProvider)) {
369		throw ODataException::createInternalServerError(
370		Messages::streamProviderWrapperMustImplementIStreamProviderToSupportStreaming()
371		);
372		}
373		}
374		}
375
376		/**
377		* Validates that an implementation of IStreamProvider2 exists and
378		* load it.
379		*
380		*
381		* @throws ODataException
382		*/
383		private function _loadAndValidateStreamProvider2()
384		{
385		$maxServiceVersion = $this->_service->getConfiguration()->getMaxDataServiceVersion();
386		if ($maxServiceVersion->compare(new Version(3, 0)) < 0) {
387		throw ODataException::createInternalServerError(
388		Messages::streamProviderWrapperMaxProtocolVersionMustBeV3OrAboveToSupportNamedStreams()
389		);
390		}
391
392		if (is_null($this->_streamProvider)) {
393		$this->_loadStreamProvider();
394		if (is_null($this->_streamProvider)) {
395		throw ODataException::createInternalServerError(
396		Messages::streamProviderWrapperMustImplementStreamProvider2ToSupportNamedStreams()
397		);
398		} elseif (!$this->_streamProvider instanceof IStreamProvider2) {
399		throw ODataException::createInternalServerError(
400		Messages::streamProviderWrapperInvalidStream2Instance()
401		);
402		}
403		}
404		}
405
406		/**
407		* Ask data service to load stream provider instance.
408		*
409		*
410		* @throws ODataException
411		*/
412		private function _loadStreamProvider()
413		{
414		if (is_null($this->_streamProvider)) {
415		$this->_streamProvider = $this->_service->getStreamProviderX();
416		if (!is_null($this->_streamProvider) && (!$this->_streamProvider instanceof IStreamProvider2)) {
417		throw ODataException::createInternalServerError(
418		Messages::streamProviderWrapperInvalidStream2Instance()
419		);
420		}
421		}
422		}
423
424		/**
425		* Construct the default edit media uri from the given media link entry uri.
426		*
427		* @param string $mediaLinkEntryUri Uri to the media link entry
428		* @param ResourceStreamInfo\|null $resourceStreamInfo Stream info instance, if its
429		* null default stream is assumed
430		*
431		* @return string Uri to the media resource
432		*/
433		public function getDefaultStreamEditMediaUri($mediaLinkEntryUri, $resourceStreamInfo)
434		{
435		$base = rtrim($mediaLinkEntryUri, '/') . '/';
436		$end = (null == $resourceStreamInfo) ? ODataConstants::URI_VALUE_SEGMENT
437		: ltrim($resourceStreamInfo->getName(), '/');
438		return $base . $end;
439		}
440
441		/**
442		* Save value of content type and etag headers before invoking implementor
443		* methods.
444		*/
445		private function _saveContentTypeAndETag()
446		{
447		$this->_responseContentType = $this->_service->getHost()->getResponseContentType();
448		$this->_responseETag = $this->_service->getHost()->getResponseETag();
		0 ignored issues – show Documentation Bug introduced 2016-11-04 10:20 UTC by Report Bug Copy Issue Report It seems like `$this->_service->getHost()->getResponseETag()` of type `object<POData\OperationContext\Web\reference>` is incompatible with the declared type `string\|null` of property `$_responseETag`. Our type inference engine has found an assignment to a property that is incompatible with the declared type of that property. Either this assignment is in error or the assigned type should be added to the documentation/type hint for that property.. Loading history...
449		}
450
451		/**
452		* Check whether implementor modified content type or etag header
453		* if so throw InvalidOperationException.
454		*
455		* @param string $methodName NAme of the method
456		*
457		* @throws InvalidOperationException
458		*/
459		private function _verifyContentTypeOrETagModified($methodName)
460		{
461		if ($this->_responseContentType !== $this->_service->getHost()->getResponseContentType()
462		\|\| $this->_responseETag !== $this->_service->getHost()->getResponseETag()
463		) {
464		throw new InvalidOperationException(
465		Messages::streamProviderWrapperMustNotSetContentTypeAndEtag($methodName)
466		);
467		}
468		}
469		}
470

Algo-Web / POData

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StreamProviderWrapper::_loadStreamProvider() A

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