PharInvocationResolver::findByAlias() - Code Metrics - Inspection of "[!!!][TASK] Reduce superfluous calls to Phar\Reade..." - TYPO3/phar-stream-wrapper - Measure and Improve Code Quality continuously with Scrutinizer

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by Oliver

created 2019-05-05 17:30 UTC

PharInvocationResolver::findByAlias() A

↳ Parent: PharInvocationResolver

Complexity

Conditions	3
Paths	2

Size

Total Lines	11
Code Lines	7

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	3
eloc	7
nc	2
nop	1
dl	0
loc	11
rs	10
c	0
b	0
f	0

<?php
declare(strict_types=1);
namespace TYPO3\PharStreamWrapper\Resolver;

/*
 * This file is part of the TYPO3 project.
 *
 * It is free software; you can redistribute it and/or modify it under the terms
 * of the MIT License (MIT). For the full copyright and license information,
 * please read the LICENSE file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

use TYPO3\PharStreamWrapper\Helper;
use TYPO3\PharStreamWrapper\Manager;
use TYPO3\PharStreamWrapper\Phar\Reader;
use TYPO3\PharStreamWrapper\Resolvable;

class PharInvocationResolver implements Resolvable
{
    const RESOLVE_REALPATH = 1;
    const RESOLVE_ALIAS = 2;
    const ASSERT_INTERNAL_INVOCATION = 32;

    /**
     * @var string[]
     */
    private $invocationFunctionNames = [
        'include',
        'include_once',
        'require',
        'require_once'
    ];

    /**
     * Contains resolved base names in order to reduce file IO.
     *
     * @var string[]
     */
    private $baseNames = [];

    /**
     * Resolves PharInvocation value object (baseName and optional alias).
     *
     * Phar aliases are intended to be used only inside Phar archives, however
     * PharStreamWrapper needs this information exposed outside of Phar as well
     * It is possible that same alias is used for different $baseName values.
     * That's why PharInvocationCollection behaves like a stack when resolving
     * base-name for a given alias. On the other hand it is not possible that
     * one $baseName is referring to multiple aliases.
     * @see https://secure.php.net/manual/en/phar.setalias.php
     * @see https://secure.php.net/manual/en/phar.mapphar.php
     *
     * @param string $path
     * @param int|null $flags
     * @return null|PharInvocation
     */
    public function resolve(string $path, int $flags = null)
    {
        $hasPharPrefix = Helper::hasPharPrefix($path);
        $flags = $flags ?? static::RESOLVE_REALPATH | static::RESOLVE_ALIAS | static::ASSERT_INTERNAL_INVOCATION;

        if ($hasPharPrefix && $flags & static::RESOLVE_ALIAS) {
            $invocation = $this->findByAlias($path);
            if ($invocation !== null) {
                return $invocation;
            }
        }

        $baseName = $this->resolveBaseName($path, $flags);
        if ($baseName === null) {
            return null;
        }

        if ($flags & static::RESOLVE_REALPATH) {
            $baseName = $this->baseNames[$baseName];
        }

        return $this->retrieveInvocation($baseName, $flags);
    }

    /**
     * Retrieves PharInvocation, either existing in collection or created on demand
     * with resolving a potential alias name used in the according Phar archive.
     *
     * @param string $baseName
     * @param int $flags
     * @return PharInvocation
     */
    private function retrieveInvocation(string $baseName, int $flags): PharInvocation
    {
        $invocation = $this->findByBaseName($baseName);
        if ($invocation !== null) {
            return $invocation;
        }

        if ($flags & static::RESOLVE_ALIAS) {
            $alias = (new Reader($baseName))->resolveContainer()->getAlias();
        } else {
            $alias = '';
        }
        // add unconfirmed(!) new invocation to collection
        $invocation = new PharInvocation($baseName, $alias);
        Manager::instance()->getCollection()->collect($invocation);
        return $invocation;
    }

    /**
     * @param string $path
     * @param int $flags
     * @return null|string
     */
    private function resolveBaseName(string $path, int $flags)
    {
        $baseName = $this->findInBaseNames($path);
        if ($baseName !== null) {
            return $baseName;
        }

        $baseName = Helper::determineBaseFile($path);
        if ($baseName !== null) {
            $this->addBaseName($baseName);
            return $baseName;
        }

        $possibleAlias = $this->resolvePossibleAlias($path);
        if (!($flags & static::RESOLVE_ALIAS) || $possibleAlias === null) {
            return null;
        }

        $trace = debug_backtrace();
        foreach ($trace as $item) {
            if (!isset($item['function']) || !isset($item['args'][0])
                || !in_array($item['function'], $this->invocationFunctionNames, true)) {
                continue;
            }
            $currentPath = $item['args'][0];
            if (Helper::hasPharPrefix($currentPath)) {
                continue;
            }
            $currentBaseName = Helper::determineBaseFile($currentPath);
            if ($currentBaseName === null) {
                continue;
            }
            // ensure the possible alias name (how we have been called initially) matches
            // the resolved alias name that was retrieved by the current possible base name
            $currentAlias = (new Reader($currentBaseName))->resolveContainer()->getAlias();
            if ($currentAlias !== $possibleAlias) {
                continue;
            }
            $this->addBaseName($currentBaseName);
            return $currentBaseName;
        }

        return null;
    }

    /**
     * @param string $path
     * @return null|string
     */
    private function resolvePossibleAlias(string $path)
    {
        $normalizedPath = Helper::normalizePath($path);
        return strstr($normalizedPath, '/', true) ?: null;
    }

    /**
     * @param string $baseName
     * @return null|PharInvocation
     */
    private function findByBaseName(string $baseName)
    {
        return Manager::instance()->getCollection()->findByCallback(
            function (PharInvocation $candidate) use ($baseName) {
                return $candidate->getBaseName() === $baseName;
            },
            true
        );
    }

    /**
     * @param string $path
     * @return null|string
     */
    private function findInBaseNames(string $path)
    {
        // return directly if the resolved base name was submitted
        if (in_array($path, $this->baseNames, true)) {
            return $path;
        }

        $parts = explode('/', Helper::normalizePath($path));

        while (count($parts)) {
            $currentPath = implode('/', $parts);
            if (isset($this->baseNames[$currentPath])) {
                return $currentPath;
            }
            array_pop($parts);
        }

        return null;
    }

    /**
     * @param string $baseName
     */
    private function addBaseName(string $baseName)
    {
        if (isset($this->baseNames[$baseName])) {
            return;
        }
        $this->baseNames[$baseName] = realpath($baseName);
    }

    /**
     * Finds confirmed(!) invocations by alias.
     *
     * @param string $path
     * @return null|PharInvocation
     * @see \TYPO3\PharStreamWrapper\PharStreamWrapper::collectInvocation()
     */
    private function findByAlias(string $path)
    {
        $possibleAlias = $this->resolvePossibleAlias($path);
        if ($possibleAlias === null) {
            return null;
        }
        return Manager::instance()->getCollection()->findByCallback(
            function (PharInvocation $candidate) use ($possibleAlias) {
                return $candidate->isConfirmed() && $candidate->getAlias() === $possibleAlias;
            },
            true
        );
    }
}


1			<?php
2			declare(strict_types=1);
3			namespace TYPO3\PharStreamWrapper\Resolver;
4
5			/*
6			* This file is part of the TYPO3 project.
7			*
8			* It is free software; you can redistribute it and/or modify it under the terms
9			* of the MIT License (MIT). For the full copyright and license information,
10			* please read the LICENSE file that was distributed with this source code.
11			*
12			* The TYPO3 project - inspiring people to share!
13			*/
14
15			use TYPO3\PharStreamWrapper\Helper;
16			use TYPO3\PharStreamWrapper\Manager;
17			use TYPO3\PharStreamWrapper\Phar\Reader;
18			use TYPO3\PharStreamWrapper\Resolvable;
19
20			class PharInvocationResolver implements Resolvable
21			{
22			const RESOLVE_REALPATH = 1;
23			const RESOLVE_ALIAS = 2;
24			const ASSERT_INTERNAL_INVOCATION = 32;
25
26			/**
27			* @var string[]
28			*/
29			private $invocationFunctionNames = [
30			'include',
31			'include_once',
32			'require',
33			'require_once'
34			];
35
36			/**
37			* Contains resolved base names in order to reduce file IO.
38			*
39			* @var string[]
40			*/
41			private $baseNames = [];
42
43			/**
44			* Resolves PharInvocation value object (baseName and optional alias).
45			*
46			* Phar aliases are intended to be used only inside Phar archives, however
47			* PharStreamWrapper needs this information exposed outside of Phar as well
48			* It is possible that same alias is used for different $baseName values.
49			* That's why PharInvocationCollection behaves like a stack when resolving
50			* base-name for a given alias. On the other hand it is not possible that
51			* one $baseName is referring to multiple aliases.
52			* @see https://secure.php.net/manual/en/phar.setalias.php
53			* @see https://secure.php.net/manual/en/phar.mapphar.php
54			*
55			* @param string $path
56			* @param int\|null $flags
57			* @return null\|PharInvocation
58			*/
59			public function resolve(string $path, int $flags = null)
60			{
61			$hasPharPrefix = Helper::hasPharPrefix($path);
62			$flags = $flags ?? static::RESOLVE_REALPATH \| static::RESOLVE_ALIAS \| static::ASSERT_INTERNAL_INVOCATION;
63
64			if ($hasPharPrefix && $flags & static::RESOLVE_ALIAS) {
65			$invocation = $this->findByAlias($path);
66			if ($invocation !== null) {
67			return $invocation;
68			}
69			}
70
71			$baseName = $this->resolveBaseName($path, $flags);
72			if ($baseName === null) {
73			return null;
74			}
75
76			if ($flags & static::RESOLVE_REALPATH) {
77			$baseName = $this->baseNames[$baseName];
78			}
79
80			return $this->retrieveInvocation($baseName, $flags);
81			}
82
83			/**
84			* Retrieves PharInvocation, either existing in collection or created on demand
85			* with resolving a potential alias name used in the according Phar archive.
86			*
87			* @param string $baseName
88			* @param int $flags
89			* @return PharInvocation
90			*/
91			private function retrieveInvocation(string $baseName, int $flags): PharInvocation
92			{
93			$invocation = $this->findByBaseName($baseName);
94			if ($invocation !== null) {
95			return $invocation;
96			}
97
98			if ($flags & static::RESOLVE_ALIAS) {
99			$alias = (new Reader($baseName))->resolveContainer()->getAlias();
100			} else {
101			$alias = '';
102			}
103			// add unconfirmed(!) new invocation to collection
104			$invocation = new PharInvocation($baseName, $alias);
105			Manager::instance()->getCollection()->collect($invocation);
106			return $invocation;
107			}
108
109			/**
110			* @param string $path
111			* @param int $flags
112			* @return null\|string
113			*/
114			private function resolveBaseName(string $path, int $flags)
115			{
116			$baseName = $this->findInBaseNames($path);
117			if ($baseName !== null) {
118			return $baseName;
119			}
120
121			$baseName = Helper::determineBaseFile($path);
122			if ($baseName !== null) {
123			$this->addBaseName($baseName);
124			return $baseName;
125			}
126
127			$possibleAlias = $this->resolvePossibleAlias($path);
128			if (!($flags & static::RESOLVE_ALIAS) \|\| $possibleAlias === null) {
129			return null;
130			}
131
132			$trace = debug_backtrace();
133			foreach ($trace as $item) {
134			if (!isset($item['function']) \|\| !isset($item['args'][0])
135			\|\| !in_array($item['function'], $this->invocationFunctionNames, true)) {
136			continue;
137			}
138			$currentPath = $item['args'][0];
139			if (Helper::hasPharPrefix($currentPath)) {
140			continue;
141			}
142			$currentBaseName = Helper::determineBaseFile($currentPath);
143			if ($currentBaseName === null) {
144			continue;
145			}
146			// ensure the possible alias name (how we have been called initially) matches
147			// the resolved alias name that was retrieved by the current possible base name
148			$currentAlias = (new Reader($currentBaseName))->resolveContainer()->getAlias();
149			if ($currentAlias !== $possibleAlias) {
150			continue;
151			}
152			$this->addBaseName($currentBaseName);
153			return $currentBaseName;
154			}
155
156			return null;
157			}
158
159			/**
160			* @param string $path
161			* @return null\|string
162			*/
163			private function resolvePossibleAlias(string $path)
164			{
165			$normalizedPath = Helper::normalizePath($path);
166			return strstr($normalizedPath, '/', true) ?: null;
167			}
168
169			/**
170			* @param string $baseName
171			* @return null\|PharInvocation
172			*/
173			private function findByBaseName(string $baseName)
174			{
175			return Manager::instance()->getCollection()->findByCallback(
176			function (PharInvocation $candidate) use ($baseName) {
177			return $candidate->getBaseName() === $baseName;
178			},
179			true
180			);
181			}
182
183			/**
184			* @param string $path
185			* @return null\|string
186			*/
187			private function findInBaseNames(string $path)
188			{
189			// return directly if the resolved base name was submitted
190			if (in_array($path, $this->baseNames, true)) {
191			return $path;
192			}
193
194			$parts = explode('/', Helper::normalizePath($path));
195
196			while (count($parts)) {
197			$currentPath = implode('/', $parts);
198			if (isset($this->baseNames[$currentPath])) {
199			return $currentPath;
200			}
201			array_pop($parts);
202			}
203
204			return null;
205			}
206
207			/**
208			* @param string $baseName
209			*/
210			private function addBaseName(string $baseName)
211			{
212			if (isset($this->baseNames[$baseName])) {
213			return;
214			}
215			$this->baseNames[$baseName] = realpath($baseName);
216			}
217
218			/**
219			* Finds confirmed(!) invocations by alias.
220			*
221			* @param string $path
222			* @return null\|PharInvocation
223			* @see \TYPO3\PharStreamWrapper\PharStreamWrapper::collectInvocation()
224			*/
225			private function findByAlias(string $path)
226			{
227			$possibleAlias = $this->resolvePossibleAlias($path);
228			if ($possibleAlias === null) {
229			return null;
230			}
231			return Manager::instance()->getCollection()->findByCallback(
232			function (PharInvocation $candidate) use ($possibleAlias) {
233			return $candidate->isConfirmed() && $candidate->getAlias() === $possibleAlias;
234			},
235			true
236			);
237			}
238			}
239

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PharInvocationResolver::findByAlias() A

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