TokenGuard::client() - Code Metrics - Inspection of "Merge branch 'release/v2.0.7'" - rinvex/laravel-oauth - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( 592d95...c00565 )

by Abdelrahman

created 2021-06-19 19:58 UTC

TokenGuard::client() B

↳ Parent: TokenGuard

Complexity

Conditions	9
Paths	11

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
dl	0
loc	18
rs	8.0555
c	0
b	0
f	0
cc	9
nc	11
nop	1

<?php

declare(strict_types=1);

namespace Rinvex\Oauth\Guards;

use Exception;
use Firebase\JWT\JWT;
use Illuminate\Http\Request;
use Rinvex\Oauth\TransientToken;
use Rinvex\Oauth\OAuthUserProvider;
use Nyholm\Psr7\Factory\Psr17Factory;
use Illuminate\Cookie\CookieValuePrefix;
use League\OAuth2\Server\ResourceServer;
use Illuminate\Contracts\Encryption\Encrypter;
use Illuminate\Contracts\Debug\ExceptionHandler;
use Illuminate\Cookie\Middleware\EncryptCookies;
use League\OAuth2\Server\Exception\OAuthServerException;
use Symfony\Bridge\PsrHttpMessage\Factory\PsrHttpFactory;

class TokenGuard
{
    /**
     * The resource server instance.
     *
     * @var \League\OAuth2\Server\ResourceServer
     */
    protected $server;

    /**
     * The user provider implementation.
     *
     * @var \Rinvex\Oauth\OAuthUserProvider
     */
    protected $provider;

    /**
     * The encrypter implementation.
     *
     * @var \Illuminate\Contracts\Encryption\Encrypter
     */
    protected $encrypter;

    /**
     * Create a new token guard instance.
     *
     * @param \League\OAuth2\Server\ResourceServer       $server
     * @param \Rinvex\Oauth\OAuthUserProvider            $provider
     * @param \Illuminate\Contracts\Encryption\Encrypter $encrypter
     *
     * @return void

     */
    public function __construct(ResourceServer $server, OAuthUserProvider $provider, Encrypter $encrypter)
    {
        $this->server = $server;
        $this->provider = $provider;
        $this->encrypter = $encrypter;
    }

    /**
     * Determine if the requested user type matches the client's user type.
     *
     * @param \Illuminate\Http\Request $request
     *
     * @return bool
     */
    protected function hasValidUserType(Request $request)
    {
        $client = $this->client($request);

        if ($client && ! $client->user_type) {
            return true;
        }

        return $client && $client->user_type === $this->provider->getUserType();
    }

    /**
     * Get the user for the incoming request.
     *
     * @param \Illuminate\Http\Request $request
     *
     * @return mixed
     */
    public function user(Request $request)
    {
        if ($request->bearerToken()) {
''   == false // true
''   == null  // true
'ab' == false // false
'ab' == null  // false

// It is often better to use strict comparison
'' === false // false
'' === null  // false
            return $this->authenticateViaBearerToken($request);
        } elseif ($request->cookie(config('rinvex.oauth.cookie'))) {
            return $this->authenticateViaCookie($request);
        }
    }

    /**
     * Get the client for the incoming request.
     *
     * @param \Illuminate\Http\Request $request
     *
     * @return mixed
     */
    public function client(Request $request)
    {
        if ($request->bearerToken()) {
''   == false // true
''   == null  // true
'ab' == false // false
'ab' == null  // false

// It is often better to use strict comparison
'' === false // false
'' === null  // false
            if (! $psr = $this->getPsrRequestViaBearerToken($request)) {
                return;
            }

            $client = app('rinvex.oauth.client')->resolveRouteBinding($psr->getAttribute('oauth_client_id'));

            return $client && ! $client->is_revoked ? $client : null;
        } elseif ($request->cookie(config('rinvex.oauth.cookie'))) {
            if ($token = $this->getTokenViaCookie($request)) {
                $client = app('rinvex.oauth.client')->resolveRouteBinding($token['aud']);

                return $client && ! $client->is_revoked ? $client : null;
            }
        }
    }

    /**
     * Authenticate the incoming request via the Bearer token.
     *
     * @param \Illuminate\Http\Request $request
     *
     * @return mixed
     */
    protected function authenticateViaBearerToken($request)
    {
        if (! $psr = $this->getPsrRequestViaBearerToken($request)) {
            return;
        }

        if (! $this->hasValidUserType($request)) {
            return;
        }

        // If the access token is valid we will retrieve the user according to the user ID
        // associated with the token. We will use the provider implementation which may
        // be used to retrieve users from Eloquent. Next, we'll be ready to continue.
        [$userType, $userId] = explode(':', $psr->getAttribute('oauth_user_id'));
function someFunction() {
    $x = 5;
    echo $x;
}
        $userId = method_exists($user = app('cortex.auth.'.$userType), 'unhashId') ? $user->unhashId($userId) : $userId;
function someFunction() {
    $x = 5;
    echo $x;
}
        $user = $this->provider->retrieveById($userId ?: null);

        if (! $user) {
            return;
        }

        // Next, we will assign a token instance to this user which the developers may use
        // to determine if the token has a given scope, etc. This will be useful during
        // authorization such as within the developer's Laravel model policy classes.
        $token = app('rinvex.oauth.access_token')->where('identifier', $psr->getAttribute('oauth_access_token_id'))->first();
        $clientId = $psr->getAttribute('oauth_client_id');

        // Finally, we will verify if the client that issued this token is still valid and
        // its tokens may still be used. If not, we will bail out since we don't want a
        // user to be able to send access tokens for deleted or revoked applications.
        $client = app('rinvex.oauth.client')->resolveRouteBinding($clientId);

        if (is_null($client) || $client->is_revoked) {
            return;
        }

        return $token ? $user->withAccessToken($token) : null;

    }

    /**
     * Authenticate and get the incoming PSR-7 request via the Bearer token.
     *
     * @param \Illuminate\Http\Request $request
     *
     * @return \Psr\Http\Message\ServerRequestInterface

     */
    protected function getPsrRequestViaBearerToken($request)
    {
        // First, we will convert the Symfony request to a PSR-7 implementation which will
        // be compatible with the base OAuth2 library. The Symfony bridge can perform a
        // conversion for us to a new Nyholm implementation of this PSR-7 request.
        $psr = (new PsrHttpFactory(
            new Psr17Factory(),
            new Psr17Factory(),
            new Psr17Factory(),
            new Psr17Factory()
        ))->createRequest($request);

        try {
            return $this->server->validateAuthenticatedRequest($psr);
        } catch (OAuthServerException $e) {
            $request->headers->set('Authorization', '', true);

            app(ExceptionHandler::class)->report($e);
        }
    }

    /**
     * Authenticate the incoming request via the token cookie.
     *
     * @param \Illuminate\Http\Request $request
     *
     * @return mixed
     */
    protected function authenticateViaCookie($request)
    {
        if (! $token = $this->getTokenViaCookie($request)) {
            return;
        }

        // If this user exists, we will return this user and attach a "transient" token to
        // the user model. The transient token assumes it has all scopes since the user
        // is physically logged into the application via the application's interface.
        if ($user = $this->provider->retrieveById($token['sub'])) {
            return $user->withAccessToken(new TransientToken());

        }
    }

    /**
     * Get the token cookie via the incoming request.
     *
     * @param \Illuminate\Http\Request $request
     *
     * @return mixed

     */
    protected function getTokenViaCookie($request)
    {
        // If we need to retrieve the token from the cookie, it'll be encrypted so we must
        // first decrypt the cookie and then attempt to find the token value within the
        // database. If we can't decrypt the value we'll bail out with a null return.
        try {
            $token = $this->decodeJwtTokenCookie($request);
        } catch (Exception $e) {
            return;
        }

        // We will compare the CSRF token in the decoded API token against the CSRF header
        // sent with the request. If they don't match then this request isn't sent from
        // a valid source and we won't authenticate the request for further handling.
        if (! config('rinvex.oauth.ignore_csrf_token') && (! $this->validCsrf($token, $request) ||
            time() >= $token['expiry'])) {
            return;
        }

        return $token;
    }

    /**
     * Decode and decrypt the JWT token cookie.
     *
     * @param \Illuminate\Http\Request $request
     *
     * @return array
     */
    protected function decodeJwtTokenCookie($request)
    {
        return (array) JWT::decode(
            CookieValuePrefix::remove($this->encrypter->decrypt($request->cookie(config('rinvex.oauth.cookie')), config('rinvex.oauth.unserializes_cookies'))),
            $this->encrypter->getKey(),
            ['HS256']
        );
    }

    /**
     * Determine if the CSRF / header are valid and match.
     *
     * @param array                    $token
     * @param \Illuminate\Http\Request $request
     *
     * @return bool
     */
    protected function validCsrf($token, $request)
    {
        return isset($token['csrf']) && hash_equals(
            $token['csrf'],
            (string) $this->getTokenFromRequest($request)
        );
    }

    /**
     * Get the CSRF token from the request.
     *
     * @param \Illuminate\Http\Request $request
     *
     * @return string

     */
    protected function getTokenFromRequest($request)
    {
        $token = $request->header('X-CSRF-TOKEN');

        if (! $token && $header = $request->header('X-XSRF-TOKEN')) {
            $token = CookieValuePrefix::remove($this->encrypter->decrypt($header, static::serialized()));
/**
 * @return array|string
 */
function returnsDifferentValues($x) {
    if ($x) {
        return 'foo';
    }

    return array();
}

$x = returnsDifferentValues($y);
if (is_array($x)) {
    // $x is an array.
}
        }

        return $token;
    }

    /**
     * Determine if the cookie contents should be serialized.
     *
     * @return bool
     */
    public static function serialized()
    {
        return EncryptCookies::serialized('XSRF-TOKEN');
    }
}


1			<?php
2
3			declare(strict_types=1);
4
5			namespace Rinvex\Oauth\Guards;
6
7			use Exception;
8			use Firebase\JWT\JWT;
9			use Illuminate\Http\Request;
10			use Rinvex\Oauth\TransientToken;
11			use Rinvex\Oauth\OAuthUserProvider;
12			use Nyholm\Psr7\Factory\Psr17Factory;
13			use Illuminate\Cookie\CookieValuePrefix;
14			use League\OAuth2\Server\ResourceServer;
15			use Illuminate\Contracts\Encryption\Encrypter;
16			use Illuminate\Contracts\Debug\ExceptionHandler;
17			use Illuminate\Cookie\Middleware\EncryptCookies;
18			use League\OAuth2\Server\Exception\OAuthServerException;
19			use Symfony\Bridge\PsrHttpMessage\Factory\PsrHttpFactory;
20
21			class TokenGuard
22			{
23			/**
24			* The resource server instance.
25			*
26			* @var \League\OAuth2\Server\ResourceServer
27			*/
28			protected $server;
29
30			/**
31			* The user provider implementation.
32			*
33			* @var \Rinvex\Oauth\OAuthUserProvider
34			*/
35			protected $provider;
36
37			/**
38			* The encrypter implementation.
39			*
40			* @var \Illuminate\Contracts\Encryption\Encrypter
41			*/
42			protected $encrypter;
43
44			/**
45			* Create a new token guard instance.
46			*
47			* @param \League\OAuth2\Server\ResourceServer $server
48			* @param \Rinvex\Oauth\OAuthUserProvider $provider
49			* @param \Illuminate\Contracts\Encryption\Encrypter $encrypter
50			*
51			* @return void
			0 ignored issues – show Comprehensibility Best Practice introduced 2021-02-11 00:56 UTC by Report Bug Copy Issue Report Adding a `@return` annotation to constructors is generally not recommended as a constructor does not have a meaningful return value. Adding a `@return` annotation to a constructor is not recommended, since a constructor does not have a meaningful return value. Please refer to the PHP core documentation on constructors. Loading history...
52			*/
53			public function __construct(ResourceServer $server, OAuthUserProvider $provider, Encrypter $encrypter)
54			{
55			$this->server = $server;
56			$this->provider = $provider;
57			$this->encrypter = $encrypter;
58			}
59
60			/**
61			* Determine if the requested user type matches the client's user type.
62			*
63			* @param \Illuminate\Http\Request $request
64			*
65			* @return bool
66			*/
67			protected function hasValidUserType(Request $request)
68			{
69			$client = $this->client($request);
70
71			if ($client && ! $client->user_type) {
72			return true;
73			}
74
75			return $client && $client->user_type === $this->provider->getUserType();
76			}
77
78			/**
79			* Get the user for the incoming request.
80			*
81			* @param \Illuminate\Http\Request $request
82			*
83			* @return mixed
84			*/
85			public function user(Request $request)
86			{
87			if ($request->bearerToken()) {
			0 ignored issues – show Bug Best Practice introduced 2021-01-18 07:09 UTC by Report Bug Copy Issue Report The expression `$request->bearerToken()` of type `string\|null` is loosely compared to `true`; this is ambiguous if the string can be empty. You might want to explicitly use `!== null` instead. In PHP, under loose comparison (like `==`, or `!=`, or `switch` conditions), values of different types might be equal. For `string` values, the empty string `''` is a special case, in particular the following results might be unexpected: '' == false // true '' == null // true 'ab' == false // false 'ab' == null // false // It is often better to use strict comparison '' === false // false '' === null // false Loading history...
88			return $this->authenticateViaBearerToken($request);
89			} elseif ($request->cookie(config('rinvex.oauth.cookie'))) {
90			return $this->authenticateViaCookie($request);
91			}
92			}
93
94			/**
95			* Get the client for the incoming request.
96			*
97			* @param \Illuminate\Http\Request $request
98			*
99			* @return mixed
100			*/
101			public function client(Request $request)
102			{
103			if ($request->bearerToken()) {
			0 ignored issues – show Bug Best Practice introduced 2021-01-18 07:09 UTC by Report Bug Copy Issue Report The expression `$request->bearerToken()` of type `string\|null` is loosely compared to `true`; this is ambiguous if the string can be empty. You might want to explicitly use `!== null` instead. In PHP, under loose comparison (like `==`, or `!=`, or `switch` conditions), values of different types might be equal. For `string` values, the empty string `''` is a special case, in particular the following results might be unexpected: '' == false // true '' == null // true 'ab' == false // false 'ab' == null // false // It is often better to use strict comparison '' === false // false '' === null // false Loading history...
104			if (! $psr = $this->getPsrRequestViaBearerToken($request)) {
105			return;
106			}
107
108			$client = app('rinvex.oauth.client')->resolveRouteBinding($psr->getAttribute('oauth_client_id'));
109
110			return $client && ! $client->is_revoked ? $client : null;
111			} elseif ($request->cookie(config('rinvex.oauth.cookie'))) {
112			if ($token = $this->getTokenViaCookie($request)) {
113			$client = app('rinvex.oauth.client')->resolveRouteBinding($token['aud']);
114
115			return $client && ! $client->is_revoked ? $client : null;
116			}
117			}
118			}
119
120			/**
121			* Authenticate the incoming request via the Bearer token.
122			*
123			* @param \Illuminate\Http\Request $request
124			*
125			* @return mixed
126			*/
127			protected function authenticateViaBearerToken($request)
128			{
129			if (! $psr = $this->getPsrRequestViaBearerToken($request)) {
130			return;
131			}
132
133			if (! $this->hasValidUserType($request)) {
134			return;
135			}
136
137			// If the access token is valid we will retrieve the user according to the user ID
138			// associated with the token. We will use the provider implementation which may
139			// be used to retrieve users from Eloquent. Next, we'll be ready to continue.
140			[$userType, $userId] = explode(':', $psr->getAttribute('oauth_user_id'));
			0 ignored issues – show Bug introduced 2021-02-28 06:03 UTC by Report Bug Copy Issue Report The variable `$userType` does not exist. Did you forget to declare it? This check marks access to variables or properties that have not been declared yet. While PHP has no explicit notion of declaring a variable, accessing it before a value is assigned to it is most likely a bug. Loading history... Bug introduced 2021-02-28 06:03 UTC by Report Bug Copy Issue Report The variable `$userId` seems only to be defined at a later point. Did you maybe move this code here without moving the variable definition? This error can happen if you refactor code and forget to move the variable initialization. Let’s take a look at a simple example: function someFunction() { $x = 5; echo $x; } The above code is perfectly fine. Now imagine that we re-order the statements: function someFunction() { echo $x; $x = 5; } In that case, `$x` would be read before it is initialized. This was a very basic example, however the principle is the same for the found issue. Loading history...
141			$userId = method_exists($user = app('cortex.auth.'.$userType), 'unhashId') ? $user->unhashId($userId) : $userId;
			0 ignored issues – show Bug introduced 2021-02-28 06:03 UTC by Report Bug Copy Issue Report The variable `$userId` seems only to be defined at a later point. Did you maybe move this code here without moving the variable definition? This error can happen if you refactor code and forget to move the variable initialization. Let’s take a look at a simple example: function someFunction() { $x = 5; echo $x; } The above code is perfectly fine. Now imagine that we re-order the statements: function someFunction() { echo $x; $x = 5; } In that case, `$x` would be read before it is initialized. This was a very basic example, however the principle is the same for the found issue. Loading history...
142			$user = $this->provider->retrieveById($userId ?: null);
143
144			if (! $user) {
145			return;
146			}
147
148			// Next, we will assign a token instance to this user which the developers may use
149			// to determine if the token has a given scope, etc. This will be useful during
150			// authorization such as within the developer's Laravel model policy classes.
151			$token = app('rinvex.oauth.access_token')->where('identifier', $psr->getAttribute('oauth_access_token_id'))->first();
152			$clientId = $psr->getAttribute('oauth_client_id');
153
154			// Finally, we will verify if the client that issued this token is still valid and
155			// its tokens may still be used. If not, we will bail out since we don't want a
156			// user to be able to send access tokens for deleted or revoked applications.
157			$client = app('rinvex.oauth.client')->resolveRouteBinding($clientId);
158
159			if (is_null($client) \|\| $client->is_revoked) {
160			return;
161			}
162
163			return $token ? $user->withAccessToken($token) : null;
			0 ignored issues – show Bug introduced 2021-01-18 07:09 UTC by Report Bug Copy Issue Report The method `withAccessToken()` does not seem to exist on `object<Illuminate\Contracts\Auth\Authenticatable>`. This check looks for calls to methods that do not seem to exist on a given type. It looks for the method on the type itself as well as in inherited classes or implemented interfaces. This is most likely a typographical error or the method has been renamed. Loading history...
164			}
165
166			/**
167			* Authenticate and get the incoming PSR-7 request via the Bearer token.
168			*
169			* @param \Illuminate\Http\Request $request
170			*
171			* @return \Psr\Http\Message\ServerRequestInterface
			0 ignored issues – show Documentation introduced 2021-01-18 07:09 UTC by Report Bug Copy Issue Report Should the return type not be `\Psr\Http\Message\ServerRequestInterface\|null`? This check compares the return type specified in the `@return` annotation of a function or method doc comment with the types returned by the function and raises an issue if they mismatch. Loading history...
172			*/
173			protected function getPsrRequestViaBearerToken($request)
174			{
175			// First, we will convert the Symfony request to a PSR-7 implementation which will
176			// be compatible with the base OAuth2 library. The Symfony bridge can perform a
177			// conversion for us to a new Nyholm implementation of this PSR-7 request.
178			$psr = (new PsrHttpFactory(
179			new Psr17Factory(),
180			new Psr17Factory(),
181			new Psr17Factory(),
182			new Psr17Factory()
183			))->createRequest($request);
184
185			try {
186			return $this->server->validateAuthenticatedRequest($psr);
187			} catch (OAuthServerException $e) {
188			$request->headers->set('Authorization', '', true);
189
190			app(ExceptionHandler::class)->report($e);
191			}
192			}
193
194			/**
195			* Authenticate the incoming request via the token cookie.
196			*
197			* @param \Illuminate\Http\Request $request
198			*
199			* @return mixed
200			*/
201			protected function authenticateViaCookie($request)
202			{
203			if (! $token = $this->getTokenViaCookie($request)) {
204			return;
205			}
206
207			// If this user exists, we will return this user and attach a "transient" token to
208			// the user model. The transient token assumes it has all scopes since the user
209			// is physically logged into the application via the application's interface.
210			if ($user = $this->provider->retrieveById($token['sub'])) {
211			return $user->withAccessToken(new TransientToken());
			0 ignored issues – show Bug introduced 2021-01-18 07:09 UTC by Report Bug Copy Issue Report The method `withAccessToken()` does not seem to exist on `object<Illuminate\Contracts\Auth\Authenticatable>`. This check looks for calls to methods that do not seem to exist on a given type. It looks for the method on the type itself as well as in inherited classes or implemented interfaces. This is most likely a typographical error or the method has been renamed. Loading history...
212			}
213			}
214
215			/**
216			* Get the token cookie via the incoming request.
217			*
218			* @param \Illuminate\Http\Request $request
219			*
220			* @return mixed
			0 ignored issues – show Documentation introduced 2021-01-18 07:09 UTC by Report Bug Copy Issue Report Consider making the return type a bit more specific; maybe use `null\|array`. This check looks for the generic type `array` as a return type and suggests a more specific type. This type is inferred from the actual code. Loading history...
221			*/
222			protected function getTokenViaCookie($request)
223			{
224			// If we need to retrieve the token from the cookie, it'll be encrypted so we must
225			// first decrypt the cookie and then attempt to find the token value within the
226			// database. If we can't decrypt the value we'll bail out with a null return.
227			try {
228			$token = $this->decodeJwtTokenCookie($request);
229			} catch (Exception $e) {
230			return;
231			}
232
233			// We will compare the CSRF token in the decoded API token against the CSRF header
234			// sent with the request. If they don't match then this request isn't sent from
235			// a valid source and we won't authenticate the request for further handling.
236			if (! config('rinvex.oauth.ignore_csrf_token') && (! $this->validCsrf($token, $request) \|\|
237			time() >= $token['expiry'])) {
238			return;
239			}
240
241			return $token;
242			}
243
244			/**
245			* Decode and decrypt the JWT token cookie.
246			*
247			* @param \Illuminate\Http\Request $request
248			*
249			* @return array
250			*/
251			protected function decodeJwtTokenCookie($request)
252			{
253			return (array) JWT::decode(
254			CookieValuePrefix::remove($this->encrypter->decrypt($request->cookie(config('rinvex.oauth.cookie')), config('rinvex.oauth.unserializes_cookies'))),
255			$this->encrypter->getKey(),
256			['HS256']
257			);
258			}
259
260			/**
261			* Determine if the CSRF / header are valid and match.
262			*
263			* @param array $token
264			* @param \Illuminate\Http\Request $request
265			*
266			* @return bool
267			*/
268			protected function validCsrf($token, $request)
269			{
270			return isset($token['csrf']) && hash_equals(
271			$token['csrf'],
272			(string) $this->getTokenFromRequest($request)
273			);
274			}
275
276			/**
277			* Get the CSRF token from the request.
278			*
279			* @param \Illuminate\Http\Request $request
280			*
281			* @return string
			0 ignored issues – show Documentation introduced 2021-01-18 07:09 UTC by Report Bug Copy Issue Report Should the return type not be `string\|array\|null`? Also, consider making the array more specific, something like `array<String>`, or `String[]`. This check compares the return type specified in the `@return` annotation of a function or method doc comment with the types returned by the function and raises an issue if they mismatch. If the return type contains the type array, this check recommends the use of a more specific type like `String[]` or `array<String>`. Loading history...
282			*/
283			protected function getTokenFromRequest($request)
284			{
285			$token = $request->header('X-CSRF-TOKEN');
286
287			if (! $token && $header = $request->header('X-XSRF-TOKEN')) {
288			$token = CookieValuePrefix::remove($this->encrypter->decrypt($header, static::serialized()));
			0 ignored issues – show Bug introduced 2021-01-18 07:09 UTC by Report Bug Copy Issue Report It seems like `$header` defined by `$request->header('X-XSRF-TOKEN')` on line `287` can also be of type `array`; however, `Illuminate\Contracts\Enc...on\Encrypter::decrypt()` does only seem to accept `string`, maybe add an additional type check? If a method or function can return multiple different values and unless you are sure that you only can receive a single value in this context, we recommend to add an additional type check: /** * @return array\|string */ function returnsDifferentValues($x) { if ($x) { return 'foo'; } return array(); } $x = returnsDifferentValues($y); if (is_array($x)) { // $x is an array. } If this a common case that PHP Analyzer should handle natively, please let us know by opening an issue. Loading history...
289			}
290
291			return $token;
292			}
293
294			/**
295			* Determine if the cookie contents should be serialized.
296			*
297			* @return bool
298			*/
299			public static function serialized()
300			{
301			return EncryptCookies::serialized('XSRF-TOKEN');
302			}
303			}
304

rinvex / laravel-oauth

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TokenGuard::client() B

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