Upload::ValidateExtension() - Code Metrics - Inspection of "1.0.0" - andela-iadeniyi/Potato-ORM - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#25)

by Adeniyi

created 2016-03-23 21:49 UTC

Upload::ValidateExtension() B

↳ Parent: Upload

Complexity

Conditions	4
Paths	4

Size

Total Lines	27
Code Lines	17

Duplication

Lines	0
Ratio	0 %

Importance

Changes	1
Bugs	0	Features	1

Metric	Value
c	1
b	0
f	1
dl	0
loc	27
rs	8.5806
cc	4
eloc	17
nc	4
nop	0

<?php

namespace Ibonly\PotatoORM;

/**
 * This class allows a user to upload and 
 * validate their files.
 *
 * @author John Ciacia <[email protected]>
 * @version 1.0
 * @copyright Copyright (c) 2007, John Ciacia
 * @license http://opensource.org/licenses/gpl-license.php GNU Public License
 */
trait Upload {
    
    /**
     *@var string contains the name of the file to be uploaded.
     */
    protected $FileName;
    /**
     *@var string contains the temporary name of the file to be uploaded.
     */
    protected $TempFileName;
    /**
     *@var string contains directory where the files should be uploaded.
     */
    protected $UploadDirectory;
    /**
     *@var string contains an array of valid extensions which are allowed to be uploaded.
     */
    protected $ValidExtensions;
    /**
     *@var string contains a message which can be used for debugging.
     */
    protected $Message;
    /**
     *@var integer contains maximum size of fiels to be uploaded in bytes.
     */
    protected $MaximumFileSize;
    /**
     *@var bool contains whether or not the files being uploaded are images.
     */
    protected $IsImage;
    /**
     *@var string contains the email address of the recipient of upload logs.
     */
    protected $Email;
    /**
     *@var integer contains maximum width of images to be uploaded.
     */
    protected $MaximumWidth;
    /**
     *@var integer contains maximum height of images to be uploaded.
     */
    protected $MaximumHeight;

    public function upload()
    {
        return 123445;
    }

    /**
     *@method bool ValidateExtension() returns whether the extension of file to be uploaded
     *    is allowable or not.
     *@return true the extension is valid.
     *@return false the extension is invalid.
     */
    public function ValidateExtension()
    {

        $FileName = trim($this->FileName);
        $FileParts = pathinfo($FileName);
        $Extension = strtolower($FileParts['extension']);
        $ValidExtensions = $this->ValidExtensions;

        if (!$FileName) {
            $this->SetMessage("ERROR: File name is empty.");
            return false;
        }

        if (!$ValidExtensions) {
            $this->SetMessage("WARNING: All extensions are valid.");
            return true;
        }

        if (in_array($Extension, $ValidExtensions)) {
            $this->SetMessage("MESSAGE: The extension '$Extension' appears to be valid.");
            return true;
        } else {
            $this->SetMessage("Error: The extension '$Extension' is invalid.");
            return false;  
        }

    }

    /**
     *@method bool ValidateSize() returns whether the file size is acceptable.
     *@return true the size is smaller than the alloted value.
     *@return false the size is larger than the alloted value.
     */
    public function ValidateSize()
    {
        $MaximumFileSize = $this->MaximumFileSize;
        $TempFileName = $this->GetTempName();
        $TempFileSize = filesize($TempFileName);

        if($MaximumFileSize == "") {
            $this->SetMessage("WARNING: There is no size restriction.");
            return true;
        }

        if ($MaximumFileSize >= $TempFileSize) {
            $this->SetMessage("ERROR: The file is too big. It must be less than $MaximumFileSize and it is $TempFileSize.");
            return false;
        }

        $this->SetMessage("Message: The file size is less than the MaximumFileSize.");
        return true;
    }

    /**
     *@method bool ValidateExistance() determins whether the file already exists. If so, rename $FileName.
     *@return true can never be returned as all file names must be unique.
     *@return false the file name does not exist.
     */
    public function ValidateExistance()
    {
        $FileName = $this->FileName;
        $UploadDirectory = $this->UploadDirectory;
        $File = $UploadDirectory . $FileName;

        if (file_exists($File)) {
            $this->SetMessage("Message: The file '$FileName' already exist.");
            $UniqueName = rand() . $FileName;
            $this->SetFileName($UniqueName);
            $this->ValidateExistance();
        } else {
            $this->SetMessage("Message: The file name '$FileName' does not exist.");
            return false;
        }
    }

    /**
     *@method bool ValidateDirectory()
     *@return true the UploadDirectory exists, writable, and has a traling slash.
     *@return false the directory was never set, does not exist, or is not writable.
     */
    public function ValidateDirectory()
    {
        $UploadDirectory = $this->UploadDirectory;

        if (!$UploadDirectory) {
            $this->SetMessage("ERROR: The directory variable is empty.");
            return false;
        }

        if (!is_dir($UploadDirectory)) {
            $this->SetMessage("ERROR: The directory '$UploadDirectory' does not exist.");
            return false;
        }

        if (!is_writable($UploadDirectory)) {
            $this->SetMessage("ERROR: The directory '$UploadDirectory' does not writable.");
            return false;
        }

        if (substr($UploadDirectory, -1) != "/") {
            $this->SetMessage("ERROR: The traling slash does not exist.");
            $NewDirectory = $UploadDirectory . "/";
            $this->SetUploadDirectory($NewDirectory);
            $this->ValidateDirectory();
        } else {
            $this->SetMessage("MESSAGE: The traling slash exist.");
            return true;
        }
    }

    /**
     *@method bool ValidateImage()
     *@return true the image is smaller than the alloted dimensions.
     *@return false the width and/or height is larger then the alloted dimensions.
     */
    public function ValidateImage() {
        $MaximumWidth = $this->MaximumWidth;
        $MaximumHeight = $this->MaximumHeight;
        $TempFileName = $this->TempFileName;

    if($Size = @getimagesize($TempFileName)) {
        $Width = $Size[0];   //$Width is the width in pixels of the image uploaded to the server.
        $Height = $Size[1];  //$Height is the height in pixels of the image uploaded to the server.
    }

        if ($Width > $MaximumWidth) {
            $this->SetMessage("The width of the image [$Width] exceeds the maximum amount [$MaximumWidth].");
function myFunction($a) {
    switch ($a) {
        case 'foo':
            $x = 1;
            break;

        case 'bar':
            $x = 2;
            break;
    }

    // $x is potentially undefined here.
    echo $x;
}
            return false;
        }

        if ($Height > $MaximumHeight) {
            $this->SetMessage("The height of the image [$Height] exceeds the maximum amount [$MaximumHeight].");
function myFunction($a) {
    switch ($a) {
        case 'foo':
            $x = 1;
            break;

        case 'bar':
            $x = 2;
            break;
    }

    // $x is potentially undefined here.
    echo $x;
}
            return false;
        }

        $this->SetMessage("The image height [$Height] and width [$Width] are within their limitations.");     
        return true;
    }

    /**
     *@method bool UploadFile() uploads the file to the server after passing all the validations.
     *@return true the file was uploaded.
     *@return false the upload failed.
     */
    public function uploadFile()
    {

        if (!$this->ValidateExtension()) {
            die($this->GetMessage());

        } 

        else if (!$this->ValidateSize()) {
            die($this->GetMessage());

        }

        else if ($this->ValidateExistance()) {
            die($this->GetMessage());

        }

        else if (!$this->ValidateDirectory()) {
$a = canBeFalseAndNull();

// Instead of
if ( ! $a) { }

// Better use one of the explicit versions:
if ($a !== null) { }
if ($a !== false) { }
if ($a !== null && $a !== false) { }
            die($this->GetMessage());

        }

        else if ($this->IsImage && !$this->ValidateImage()) {
            die($this->GetMessage());

        }

        else {

            $FileName = $this->FileName;
            $TempFileName = $this->TempFileName;
            $UploadDirectory = $this->UploadDirectory;

            if (is_uploaded_file($TempFileName)) { 
                move_uploaded_file($TempFileName, $UploadDirectory . $FileName);
                return true;
            } else {
                return false;
            }

        }

    }

    #Accessors and Mutators beyond this point.
    #Siginificant documentation is not needed.
    public function SetFileName($argv)
    {
        $this->FileName = $argv;
    }

    public function SetUploadDirectory($argv)
    {
        $this->UploadDirectory = $argv;
    }

    public function SetTempName($argv)
    {
        $this->TempFileName = $argv;
    }

    public function SetValidExtensions($argv)
    {
        $this->ValidExtensions = $argv;
    }

    public function SetMessage($argv)
    {
        $this->Message = $argv;
    }

    public function SetMaximumFileSize($argv)
    {
        $this->MaximumFileSize = $argv;
    }

    public function SetEmail($argv)
    {
        $this->Email = $argv;
    }
   
    public function SetIsImage($argv)
    {
        $this->IsImage = $argv;
    }

    public function SetMaximumWidth($argv)
    {
        $this->MaximumWidth = $argv;
    }

    public function SetMaximumHeight($argv)
    {
        $this->MaximumHeight = $argv;
    }   
    public function GetFileName()
    {
        return $this->FileName;
    }

    public function GetUploadDirectory()
    {
        return $this->UploadDirectory;
    }

    public function GetTempName()
    {
        return $this->TempFileName;
    }

    public function GetValidExtensions()
    {
        return $this->ValidExtensions;
    }

    public function GetMessage()
    {
        if (!isset($this->Message)) {
            $this->SetMessage("No Message");
        }

        return $this->Message;
    }

    public function GetMaximumFileSize()
    {
        return $this->MaximumFileSize;
    }

    public function GetEmail()
    {
        return $this->Email;
    }

    public function GetIsImage()
    {
        return $this->IsImage;
    }

    public function GetMaximumWidth()
    {
        return $this->MaximumWidth;
    }

    public function GetMaximumHeight()
    {
        return $this->MaximumHeight;
    }
}

Pull Request — master (#25)

Upload::ValidateExtension() B

Complexity

Size

Duplication

Importance

Available Fixes

Available Fixes

1			<?php
2
3			namespace Ibonly\PotatoORM;
4
5			/**
6			* This class allows a user to upload and
7			* validate their files.
8			*
9			* @author John Ciacia <[email protected]>
10			* @version 1.0
11			* @copyright Copyright (c) 2007, John Ciacia
12			* @license http://opensource.org/licenses/gpl-license.php GNU Public License
13			*/
14			trait Upload {
15
16			/**
17			*@var string contains the name of the file to be uploaded.
18			*/
19			protected $FileName;
20			/**
21			*@var string contains the temporary name of the file to be uploaded.
22			*/
23			protected $TempFileName;
24			/**
25			*@var string contains directory where the files should be uploaded.
26			*/
27			protected $UploadDirectory;
28			/**
29			*@var string contains an array of valid extensions which are allowed to be uploaded.
30			*/
31			protected $ValidExtensions;
32			/**
33			*@var string contains a message which can be used for debugging.
34			*/
35			protected $Message;
36			/**
37			*@var integer contains maximum size of fiels to be uploaded in bytes.
38			*/
39			protected $MaximumFileSize;
40			/**
41			*@var bool contains whether or not the files being uploaded are images.
42			*/
43			protected $IsImage;
44			/**
45			*@var string contains the email address of the recipient of upload logs.
46			*/
47			protected $Email;
48			/**
49			*@var integer contains maximum width of images to be uploaded.
50			*/
51			protected $MaximumWidth;
52			/**
53			*@var integer contains maximum height of images to be uploaded.
54			*/
55			protected $MaximumHeight;
56
57			public function upload()
58			{
59			return 123445;
60			}
61
62			/**
63			*@method bool ValidateExtension() returns whether the extension of file to be uploaded
64			* is allowable or not.
65			*@return true the extension is valid.
66			*@return false the extension is invalid.
67			*/
68			public function ValidateExtension()
69			{
70
71			$FileName = trim($this->FileName);
72			$FileParts = pathinfo($FileName);
73			$Extension = strtolower($FileParts['extension']);
74			$ValidExtensions = $this->ValidExtensions;
75
76			if (!$FileName) {
77			$this->SetMessage("ERROR: File name is empty.");
78			return false;
79			}
80
81			if (!$ValidExtensions) {
82			$this->SetMessage("WARNING: All extensions are valid.");
83			return true;
84			}
85
86			if (in_array($Extension, $ValidExtensions)) {
87			$this->SetMessage("MESSAGE: The extension '$Extension' appears to be valid.");
88			return true;
89			} else {
90			$this->SetMessage("Error: The extension '$Extension' is invalid.");
91			return false;
92			}
93
94			}
95
96			/**
97			*@method bool ValidateSize() returns whether the file size is acceptable.
98			*@return true the size is smaller than the alloted value.
99			*@return false the size is larger than the alloted value.
100			*/
101			public function ValidateSize()
102			{
103			$MaximumFileSize = $this->MaximumFileSize;
104			$TempFileName = $this->GetTempName();
105			$TempFileSize = filesize($TempFileName);
106
107			if($MaximumFileSize == "") {
108			$this->SetMessage("WARNING: There is no size restriction.");
109			return true;
110			}
111
112			if ($MaximumFileSize >= $TempFileSize) {
113			$this->SetMessage("ERROR: The file is too big. It must be less than $MaximumFileSize and it is $TempFileSize.");
114			return false;
115			}
116
117			$this->SetMessage("Message: The file size is less than the MaximumFileSize.");
118			return true;
119			}
120
121			/**
122			*@method bool ValidateExistance() determins whether the file already exists. If so, rename $FileName.
123			*@return true can never be returned as all file names must be unique.
124			*@return false the file name does not exist.
125			*/
126			public function ValidateExistance()
127			{
128			$FileName = $this->FileName;
129			$UploadDirectory = $this->UploadDirectory;
130			$File = $UploadDirectory . $FileName;
131
132			if (file_exists($File)) {
133			$this->SetMessage("Message: The file '$FileName' already exist.");
134			$UniqueName = rand() . $FileName;
135			$this->SetFileName($UniqueName);
136			$this->ValidateExistance();
137			} else {
138			$this->SetMessage("Message: The file name '$FileName' does not exist.");
139			return false;
140			}
141			}
142
143			/**
144			*@method bool ValidateDirectory()
145			*@return true the UploadDirectory exists, writable, and has a traling slash.
146			*@return false the directory was never set, does not exist, or is not writable.
147			*/
148			public function ValidateDirectory()
149			{
150			$UploadDirectory = $this->UploadDirectory;
151
152			if (!$UploadDirectory) {
153			$this->SetMessage("ERROR: The directory variable is empty.");
154			return false;
155			}
156
157			if (!is_dir($UploadDirectory)) {
158			$this->SetMessage("ERROR: The directory '$UploadDirectory' does not exist.");
159			return false;
160			}
161
162			if (!is_writable($UploadDirectory)) {
163			$this->SetMessage("ERROR: The directory '$UploadDirectory' does not writable.");
164			return false;
165			}
166
167			if (substr($UploadDirectory, -1) != "/") {
168			$this->SetMessage("ERROR: The traling slash does not exist.");
169			$NewDirectory = $UploadDirectory . "/";
170			$this->SetUploadDirectory($NewDirectory);
171			$this->ValidateDirectory();
172			} else {
173			$this->SetMessage("MESSAGE: The traling slash exist.");
174			return true;
175			}
176			}
177
178			/**
179			*@method bool ValidateImage()
180			*@return true the image is smaller than the alloted dimensions.
181			*@return false the width and/or height is larger then the alloted dimensions.
182			*/
183			public function ValidateImage() {
184			$MaximumWidth = $this->MaximumWidth;
185			$MaximumHeight = $this->MaximumHeight;
186			$TempFileName = $this->TempFileName;
187
188			if($Size = @getimagesize($TempFileName)) {
189			$Width = $Size[0]; //$Width is the width in pixels of the image uploaded to the server.
190			$Height = $Size[1]; //$Height is the height in pixels of the image uploaded to the server.
191			}
192
193			if ($Width > $MaximumWidth) {
194			$this->SetMessage("The width of the image [$Width] exceeds the maximum amount [$MaximumWidth].");
			0 ignored issues – show Bug introduced 2016-03-23 21:51 UTC by Report Bug Copy Issue Report The variable `$Width` does not seem to be defined for all execution paths leading up to this point. If you define a variable conditionally, it can happen that it is not defined for all execution paths. Let’s take a look at an example: function myFunction($a) { switch ($a) { case 'foo': $x = 1; break; case 'bar': $x = 2; break; } // $x is potentially undefined here. echo $x; } In the above example, the variable `$x` is defined if you pass “foo” or “bar” as argument for `$a`. However, since the `switch` statement has no default case statement, if you pass any other value, the variable `$x` would be undefined. Available Fixes Check for existence of the variable explicitly: function myFunction($a) { switch ($a) { case 'foo': $x = 1; break; case 'bar': $x = 2; break; } if (isset($x)) { // Make sure it's always set. echo $x; } } Define a default value for the variable: function myFunction($a) { $x = ''; // Set a default which gets overridden for certain paths. switch ($a) { case 'foo': $x = 1; break; case 'bar': $x = 2; break; } echo $x; } Add a value for the missing path: function myFunction($a) { switch ($a) { case 'foo': $x = 1; break; case 'bar': $x = 2; break; // We add support for the missing case. default: $x = ''; break; } echo $x; } Loading history...
195			return false;
196			}
197
198			if ($Height > $MaximumHeight) {
199			$this->SetMessage("The height of the image [$Height] exceeds the maximum amount [$MaximumHeight].");
			0 ignored issues – show Bug introduced 2016-03-23 21:51 UTC by Report Bug Copy Issue Report The variable `$Height` does not seem to be defined for all execution paths leading up to this point. If you define a variable conditionally, it can happen that it is not defined for all execution paths. Let’s take a look at an example: function myFunction($a) { switch ($a) { case 'foo': $x = 1; break; case 'bar': $x = 2; break; } // $x is potentially undefined here. echo $x; } In the above example, the variable `$x` is defined if you pass “foo” or “bar” as argument for `$a`. However, since the `switch` statement has no default case statement, if you pass any other value, the variable `$x` would be undefined. Available Fixes Check for existence of the variable explicitly: function myFunction($a) { switch ($a) { case 'foo': $x = 1; break; case 'bar': $x = 2; break; } if (isset($x)) { // Make sure it's always set. echo $x; } } Define a default value for the variable: function myFunction($a) { $x = ''; // Set a default which gets overridden for certain paths. switch ($a) { case 'foo': $x = 1; break; case 'bar': $x = 2; break; } echo $x; } Add a value for the missing path: function myFunction($a) { switch ($a) { case 'foo': $x = 1; break; case 'bar': $x = 2; break; // We add support for the missing case. default: $x = ''; break; } echo $x; } Loading history...
200			return false;
201			}
202
203			$this->SetMessage("The image height [$Height] and width [$Width] are within their limitations.");
204			return true;
205			}
206
207			/**
208			*@method bool UploadFile() uploads the file to the server after passing all the validations.
209			*@return true the file was uploaded.
210			*@return false the upload failed.
211			*/
212			public function uploadFile()
213			{
214
215			if (!$this->ValidateExtension()) {
216			die($this->GetMessage());
			0 ignored issues – show Coding Style Compatibility introduced 2016-03-23 21:51 UTC by Report Bug Copy Issue Report The method `uploadFile()` contains an exit expression. An exit expression should only be used in rare cases. For example, if you write a short command line script. In most cases however, using an `exit` expression makes the code untestable and often causes incompatibilities with other libraries. Thus, unless you are absolutely sure it is required here, we recommend to refactor your code to avoid its usage. Loading history...
217			}
218
219			else if (!$this->ValidateSize()) {
220			die($this->GetMessage());
			0 ignored issues – show Coding Style Compatibility introduced 2016-03-23 21:51 UTC by Report Bug Copy Issue Report The method `uploadFile()` contains an exit expression. An exit expression should only be used in rare cases. For example, if you write a short command line script. In most cases however, using an `exit` expression makes the code untestable and often causes incompatibilities with other libraries. Thus, unless you are absolutely sure it is required here, we recommend to refactor your code to avoid its usage. Loading history...
221			}
222
223			else if ($this->ValidateExistance()) {
224			die($this->GetMessage());
			0 ignored issues – show Coding Style Compatibility introduced 2016-03-23 21:51 UTC by Report Bug Copy Issue Report The method `uploadFile()` contains an exit expression. An exit expression should only be used in rare cases. For example, if you write a short command line script. In most cases however, using an `exit` expression makes the code untestable and often causes incompatibilities with other libraries. Thus, unless you are absolutely sure it is required here, we recommend to refactor your code to avoid its usage. Loading history...
225			}
226
227			else if (!$this->ValidateDirectory()) {
			0 ignored issues – show Bug Best Practice introduced 2016-03-23 21:51 UTC by Report Bug Copy Issue Report The expression `$this->ValidateDirectory()` of type `null\|boolean` is loosely compared to `false`; this is ambiguous if the boolean can be false. You might want to explicitly use `!== null` instead. If an expression can have both `false`, and `null` as possible values. It is generally a good practice to always use strict comparison to clearly distinguish between those two values. $a = canBeFalseAndNull(); // Instead of if ( ! $a) { } // Better use one of the explicit versions: if ($a !== null) { } if ($a !== false) { } if ($a !== null && $a !== false) { } Loading history...
228			die($this->GetMessage());
			0 ignored issues – show Coding Style Compatibility introduced 2016-03-23 21:51 UTC by Report Bug Copy Issue Report The method `uploadFile()` contains an exit expression. An exit expression should only be used in rare cases. For example, if you write a short command line script. In most cases however, using an `exit` expression makes the code untestable and often causes incompatibilities with other libraries. Thus, unless you are absolutely sure it is required here, we recommend to refactor your code to avoid its usage. Loading history...
229			}
230
231			else if ($this->IsImage && !$this->ValidateImage()) {
232			die($this->GetMessage());
			0 ignored issues – show Coding Style Compatibility introduced 2016-03-23 21:51 UTC by Report Bug Copy Issue Report The method `uploadFile()` contains an exit expression. An exit expression should only be used in rare cases. For example, if you write a short command line script. In most cases however, using an `exit` expression makes the code untestable and often causes incompatibilities with other libraries. Thus, unless you are absolutely sure it is required here, we recommend to refactor your code to avoid its usage. Loading history...
233			}
234
235			else {
236
237			$FileName = $this->FileName;
238			$TempFileName = $this->TempFileName;
239			$UploadDirectory = $this->UploadDirectory;
240
241			if (is_uploaded_file($TempFileName)) {
242			move_uploaded_file($TempFileName, $UploadDirectory . $FileName);
243			return true;
244			} else {
245			return false;
246			}
247
248			}
249
250			}
251
252			#Accessors and Mutators beyond this point.
253			#Siginificant documentation is not needed.
254			public function SetFileName($argv)
255			{
256			$this->FileName = $argv;
257			}
258
259			public function SetUploadDirectory($argv)
260			{
261			$this->UploadDirectory = $argv;
262			}
263
264			public function SetTempName($argv)
265			{
266			$this->TempFileName = $argv;
267			}
268
269			public function SetValidExtensions($argv)
270			{
271			$this->ValidExtensions = $argv;
272			}
273
274			public function SetMessage($argv)
275			{
276			$this->Message = $argv;
277			}
278
279			public function SetMaximumFileSize($argv)
280			{
281			$this->MaximumFileSize = $argv;
282			}
283
284			public function SetEmail($argv)
285			{
286			$this->Email = $argv;
287			}
288
289			public function SetIsImage($argv)
290			{
291			$this->IsImage = $argv;
292			}
293
294			public function SetMaximumWidth($argv)
295			{
296			$this->MaximumWidth = $argv;
297			}
298
299			public function SetMaximumHeight($argv)
300			{
301			$this->MaximumHeight = $argv;
302			}
303			public function GetFileName()
304			{
305			return $this->FileName;
306			}
307
308			public function GetUploadDirectory()
309			{
310			return $this->UploadDirectory;
311			}
312
313			public function GetTempName()
314			{
315			return $this->TempFileName;
316			}
317
318			public function GetValidExtensions()
319			{
320			return $this->ValidExtensions;
321			}
322
323			public function GetMessage()
324			{
325			if (!isset($this->Message)) {
326			$this->SetMessage("No Message");
327			}
328
329			return $this->Message;
330			}
331
332			public function GetMaximumFileSize()
333			{
334			return $this->MaximumFileSize;
335			}
336
337			public function GetEmail()
338			{
339			return $this->Email;
340			}
341
342			public function GetIsImage()
343			{
344			return $this->IsImage;
345			}
346
347			public function GetMaximumWidth()
348			{
349			return $this->MaximumWidth;
350			}
351
352			public function GetMaximumHeight()
353			{
354			return $this->MaximumHeight;
355			}
356			}

andela-iadeniyi / Potato-ORM

Pull Request — master (#25)

Upload::ValidateExtension() B

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