LocalPasswordPrimaryAuthenticationProvider - Code Metrics - wikimedia/mediawiki - Measure and Improve Code Quality continuously with Scrutinizer

LocalPasswordPrimaryAuthenticationProvider C
last analyzed 2016-11-13 17:42 UTC

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Complexity

Total Complexity

Size/Duplication

Total Lines	291
Duplicated Lines	14.43 %

Coupling/Cohesion

Components	1
Dependencies	11

Importance

Changes

Metric	Value
dl	42
loc	291
rs	6.8
c	0
b	0
f	0
wmc	55
lcom	1
cbo	11

11 Methods

Rating	Name	Duplication	Size	Complexity
A	__construct()	0	4	1
B	getPasswordResetData()	0	22	4
D	beginPrimaryAuthentication()	0	83	14
B	testUserCanAuthenticate()	0	25	4
A	testUserExists()	15	15	2
C	providerAllowsAuthenticationDataChange()	7	38	8
B	providerChangeAuthenticationData()	0	31	6
A	accountCreationType()	0	3	2
B	testForAccountCreation()	7	15	6
B	beginPrimaryAccountCreation()	13	21	6
A	finishAccountCreation()	0	10	2

How to fix Duplicated Code Complexity

Duplicated Code

Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.

Common duplication problems, and corresponding solutions are:

If you have the same expression in different places: Extract expression to a method
If you have the same method in different sub-classes: Extract method, and pull up field to the parent class
If you have the same code in unrelated classes: Consider extracting the code to a new class, and injecting that class

Complex Class

Tip: Before tackling complexity, make sure that you eliminate any duplication first. This often can reduce the size of classes significantly.

Complex classes like LocalPasswordPrimaryAuthenticationProvider often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.

Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.

While breaking up the class, it is a good idea to analyze how other classes use LocalPasswordPrimaryAuthenticationProvider, and based on these observations, apply Extract Interface, too.

<?php
/**
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 * @ingroup Auth
 */

namespace MediaWiki\Auth;

use User;

/**
 * A primary authentication provider that uses the password field in the 'user' table.
 * @ingroup Auth
 * @since 1.27
 */
class LocalPasswordPrimaryAuthenticationProvider
	extends AbstractPasswordPrimaryAuthenticationProvider

{

	/** @var bool If true, this instance is for legacy logins only. */
	protected $loginOnly = false;

	/**
	 * @param array $params Settings
	 *  - loginOnly: If true, the local passwords are for legacy logins only:
	 *    the local password will be invalidated when authentication is changed
	 *    and new users will not have a valid local password set.
	 */
	public function __construct( $params = [] ) {
		parent::__construct( $params );
		$this->loginOnly = !empty( $params['loginOnly'] );
	}

	protected function getPasswordResetData( $username, $row ) {
		$now = wfTimestamp();
		$expiration = wfTimestampOrNull( TS_UNIX, $row->user_password_expires );
		if ( $expiration === null || $expiration >= $now ) {
			return null;
		}

		$grace = $this->config->get( 'PasswordExpireGrace' );
		if ( $expiration + $grace < $now ) {
			$data = [
				'hard' => true,
				'msg' => \Status::newFatal( 'resetpass-expired' )->getMessage(),
			];
		} else {
			$data = [
				'hard' => false,
				'msg' => \Status::newFatal( 'resetpass-expired-soft' )->getMessage(),
			];
		}

		return (object)$data;
	}

	public function beginPrimaryAuthentication( array $reqs ) {
		$req = AuthenticationRequest::getRequestByClass( $reqs, PasswordAuthenticationRequest::class );
		if ( !$req ) {
			return AuthenticationResponse::newAbstain();
		}

		if ( $req->username === null || $req->password === null ) {

			return AuthenticationResponse::newAbstain();
		}

		$username = User::getCanonicalName( $req->username, 'usable' );
		if ( $username === false ) {
			return AuthenticationResponse::newAbstain();
		}

		$fields = [
			'user_id', 'user_password', 'user_password_expires',
		];

		$dbr = wfGetDB( DB_REPLICA );
		$row = $dbr->selectRow(
			'user',
			$fields,
			[ 'user_name' => $username ],
			__METHOD__
		);
		if ( !$row ) {
			return AuthenticationResponse::newAbstain();
		}

		$oldRow = clone $row;
		// Check for *really* old password hashes that don't even have a type
		// The old hash format was just an md5 hex hash, with no type information
		if ( preg_match( '/^[0-9a-f]{32}$/', $row->user_password ) ) {
			if ( $this->config->get( 'PasswordSalt' ) ) {
				$row->user_password = ":A:{$row->user_id}:{$row->user_password}";
			} else {
				$row->user_password = ":A:{$row->user_password}";
			}
		}

		$status = $this->checkPasswordValidity( $username, $req->password );
/**
 * @return array|string
 */
function returnsDifferentValues($x) {
    if ($x) {
        return 'foo';
    }

    return array();
}

$x = returnsDifferentValues($y);
if (is_array($x)) {
    // $x is an array.
}
		if ( !$status->isOK() ) {
			// Fatal, can't log in
			return AuthenticationResponse::newFail( $status->getMessage() );
		}

		$pwhash = $this->getPassword( $row->user_password );
		if ( !$pwhash->equals( $req->password ) ) {
			if ( $this->config->get( 'LegacyEncoding' ) ) {
				// Some wikis were converted from ISO 8859-1 to UTF-8, the passwords can't be converted
				// Check for this with iconv
				$cp1252Password = iconv( 'UTF-8', 'WINDOWS-1252//TRANSLIT', $req->password );
				if ( $cp1252Password === $req->password || !$pwhash->equals( $cp1252Password ) ) {
					return $this->failResponse( $req );

				}
			} else {
				return $this->failResponse( $req );

			}
		}

		// @codeCoverageIgnoreStart
		if ( $this->getPasswordFactory()->needsUpdate( $pwhash ) ) {
			$pwhash = $this->getPasswordFactory()->newFromPlaintext( $req->password );
			\DeferredUpdates::addCallableUpdate( function () use ( $pwhash, $oldRow ) {
				$dbw = wfGetDB( DB_MASTER );
				$dbw->update(
					'user',
					[ 'user_password' => $pwhash->toString() ],
					[
						'user_id' => $oldRow->user_id,
						'user_password' => $oldRow->user_password
					],
					__METHOD__
				);
			} );
		}
		// @codeCoverageIgnoreEnd

		$this->setPasswordResetFlag( $username, $status, $row );
/**
 * @return array|string
 */
function returnsDifferentValues($x) {
    if ($x) {
        return 'foo';
    }

    return array();
}

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

		return AuthenticationResponse::newPass( $username );
/**
 * @return array|string
 */
function returnsDifferentValues($x) {
    if ($x) {
        return 'foo';
    }

    return array();
}

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

	public function testUserCanAuthenticate( $username ) {
		$username = User::getCanonicalName( $username, 'usable' );
		if ( $username === false ) {
			return false;
		}

		$dbr = wfGetDB( DB_REPLICA );
		$row = $dbr->selectRow(
			'user',
			[ 'user_password' ],
			[ 'user_name' => $username ],
			__METHOD__
		);
		if ( !$row ) {
			return false;
		}

		// Check for *really* old password hashes that don't even have a type
		// The old hash format was just an md5 hex hash, with no type information
		if ( preg_match( '/^[0-9a-f]{32}$/', $row->user_password ) ) {
			return true;
		}

		return !$this->getPassword( $row->user_password ) instanceof \InvalidPassword;
	}

	public function testUserExists( $username, $flags = User::READ_NORMAL ) {
		$username = User::getCanonicalName( $username, 'usable' );
		if ( $username === false ) {
			return false;
		}

		list( $db, $options ) = \DBAccessObjectUtils::getDBOptions( $flags );
		return (bool)wfGetDB( $db )->selectField(
			[ 'user' ],
			[ 'user_id' ],
			[ 'user_name' => $username ],
			__METHOD__,
			$options
		);
	}

	public function providerAllowsAuthenticationDataChange(
		AuthenticationRequest $req, $checkData = true
	) {
		// We only want to blank the password if something else will accept the
		// new authentication data, so return 'ignore' here.
		if ( $this->loginOnly ) {
			return \StatusValue::newGood( 'ignored' );
		}

		if ( get_class( $req ) === PasswordAuthenticationRequest::class ) {
			if ( !$checkData ) {
				return \StatusValue::newGood();
			}

			$username = User::getCanonicalName( $req->username, 'usable' );
			if ( $username !== false ) {
				$row = wfGetDB( DB_MASTER )->selectRow(
					'user',
					[ 'user_id' ],
					[ 'user_name' => $username ],
					__METHOD__
				);
				if ( $row ) {
					$sv = \StatusValue::newGood();
					if ( $req->password !== null ) {
						if ( $req->password !== $req->retype ) {

							$sv->fatal( 'badretype' );
						} else {
							$sv->merge( $this->checkPasswordValidity( $username, $req->password ) );
/**
 * @return array|string
 */
function returnsDifferentValues($x) {
    if ($x) {
        return 'foo';
    }

    return array();
}

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

		return \StatusValue::newGood( 'ignored' );
	}

	public function providerChangeAuthenticationData( AuthenticationRequest $req ) {
		$username = $req->username !== null ? User::getCanonicalName( $req->username, 'usable' ) : false;
		if ( $username === false ) {
			return;
		}

		$pwhash = null;

		if ( $this->loginOnly ) {
			$pwhash = $this->getPasswordFactory()->newFromCiphertext( null );
			$expiry = null;
			// @codeCoverageIgnoreStart
		} elseif ( get_class( $req ) === PasswordAuthenticationRequest::class ) {
			// @codeCoverageIgnoreEnd
			$pwhash = $this->getPasswordFactory()->newFromPlaintext( $req->password );

			$expiry = $this->getNewPasswordExpiry( $username );
/**
 * @return array|string
 */
function returnsDifferentValues($x) {
    if ($x) {
        return 'foo';
    }

    return array();
}

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

		if ( $pwhash ) {
			$dbw = wfGetDB( DB_MASTER );
			$dbw->update(
				'user',
				[
					'user_password' => $pwhash->toString(),
					'user_password_expires' => $dbw->timestampOrNull( $expiry ),
function myFunction($a) {
    switch ($a) {
        case 'foo':
            $x = 1;
            break;

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

    // $x is potentially undefined here.
    echo $x;
}
				],
				[ 'user_name' => $username ],
				__METHOD__
			);
		}
	}

	public function accountCreationType() {
		return $this->loginOnly ? self::TYPE_NONE : self::TYPE_CREATE;
	}

	public function testForAccountCreation( $user, $creator, array $reqs ) {
		$req = AuthenticationRequest::getRequestByClass( $reqs, PasswordAuthenticationRequest::class );

		$ret = \StatusValue::newGood();
		if ( !$this->loginOnly && $req && $req->username !== null && $req->password !== null ) {
			if ( $req->password !== $req->retype ) {

				$ret->fatal( 'badretype' );
			} else {
				$ret->merge(
					$this->checkPasswordValidity( $user->getName(), $req->password )

				);
			}
		}
		return $ret;
	}

	public function beginPrimaryAccountCreation( $user, $creator, array $reqs ) {
		if ( $this->accountCreationType() === self::TYPE_NONE ) {
			throw new \BadMethodCallException( 'Shouldn\'t call this when accountCreationType() is NONE' );
		}

		$req = AuthenticationRequest::getRequestByClass( $reqs, PasswordAuthenticationRequest::class );
		if ( $req ) {
			if ( $req->username !== null && $req->password !== null ) {

				// Nothing we can do besides claim it, because the user isn't in
				// the DB yet
				if ( $req->username !== $user->getName() ) {
					$req = clone( $req );
					$req->username = $user->getName();
				}
				$ret = AuthenticationResponse::newPass( $req->username );
				$ret->createRequest = $req;
				return $ret;
			}
		}
		return AuthenticationResponse::newAbstain();
	}

	public function finishAccountCreation( $user, $creator, AuthenticationResponse $res ) {
		if ( $this->accountCreationType() === self::TYPE_NONE ) {
			throw new \BadMethodCallException( 'Shouldn\'t call this when accountCreationType() is NONE' );
		}

		// Now that the user is in the DB, set the password on it.
		$this->providerChangeAuthenticationData( $res->createRequest );
/** @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);
    }
}

		return null;
	}
}


wikimedia / mediawiki

LocalPasswordPrimaryAuthenticationProvider C last analyzed 2016-11-13 17:42 UTC