HumHub Documentation (unofficial)

ContentNegotiator extends ActionFilter
in package
implements BootstrapInterface

ContentNegotiator supports response format negotiation and application language negotiation.

When the [[formats|supported formats]] property is specified, ContentNegotiator will support response format negotiation based on the value of the GET parameter [[formatParam]] and the Accept HTTP header. If a match is found, the [[Response::format]] property will be set as the chosen format. The [[Response::acceptMimeType]] as well as [[Response::acceptParams]] will also be updated accordingly.

When the [[languages|supported languages]] is specified, ContentNegotiator will support application language negotiation based on the value of the GET parameter [[languageParam]] and the Accept-Language HTTP header. If a match is found, the [[\yii\base\Application::language]] property will be set as the chosen language.

You may use ContentNegotiator as a bootstrapping component as well as an action filter.

The following code shows how you can use ContentNegotiator as a bootstrapping component. Note that in this case, the content negotiation applies to the whole application.

// in application configuration
use yii\web\Response;

return [
    'bootstrap' => [
        [
            'class' => 'yii\filters\ContentNegotiator',
            'formats' => [
                'application/json' => Response::FORMAT_JSON,
                'application/xml' => Response::FORMAT_XML,
            ],
            'languages' => [
                'en',
                'de',
            ],
        ],
    ],
];

The following code shows how you can use ContentNegotiator as an action filter in either a controller or a module. In this case, the content negotiation result only applies to the corresponding controller or module, or even specific actions if you configure the only or except property of the filter.

use yii\web\Response;

public function behaviors()
{
    return [
        [
            'class' => 'yii\filters\ContentNegotiator',
            'only' => ['view', 'index'],  // in a controller
            // if in a module, use the following IDs for user actions
            // 'only' => ['user/view', 'user/index']
            'formats' => [
                'application/json' => Response::FORMAT_JSON,
            ],
            'languages' => [
                'en',
                'de',
            ],
        ],
    ];
}
Tags
author

Qiang Xue qiang.xue@gmail.com

since
2.0

Table of Contents

Interfaces

BootstrapInterface
BootstrapInterface is the interface that should be implemented by classes who want to participate in the application bootstrap process.

Properties

$except  : array<string|int, mixed>
$formatParam  : string
$formats  : array<string|int, mixed>|null
$languageParam  : string
$languages  : array<string|int, mixed>|null
$only  : array<string|int, mixed>
$owner  : Component|null
$request  : Request
$response  : Response|null
$_attachedEvents  : array<string|int, mixed>

Methods

__call()  : mixed
Calls the named method which is not a class method.
__construct()  : mixed
Constructor.
__get()  : mixed
Returns the value of an object property.
__isset()  : bool
Checks if a property is set, i.e. defined and not null.
__set()  : mixed
Sets value of an object property.
__unset()  : mixed
Sets an object property to null.
afterAction()  : mixed
This method is invoked right after an action is executed.
afterFilter()  : mixed
attach()  : mixed
Attaches the behavior object to the component.
beforeAction()  : bool
This method is invoked right before an action is to be executed (after all possible filters.) You may override this method to do last-minute preparation for the action.
beforeFilter()  : mixed
bootstrap()  : mixed
Bootstrap method to be called during application bootstrap stage.
canGetProperty()  : bool
Returns a value indicating whether a property can be read.
canSetProperty()  : bool
Returns a value indicating whether a property can be set.
className()  : string
Returns the fully qualified name of this class.
detach()  : mixed
Detaches the behavior object from the component.
events()  : array<string|int, mixed>
Declares event handlers for the [[owner]]'s events.
hasMethod()  : bool
Returns a value indicating whether a method is defined.
hasProperty()  : bool
Returns a value indicating whether a property is defined.
init()  : mixed
Initializes the object.
negotiate()  : mixed
Negotiates the response format and application language.
getActionId()  : string
Returns an action ID by converting [[Action::$uniqueId]] into an ID relative to the module.
isActive()  : bool
Returns a value indicating whether the filter is active for the given action.
isLanguageSupported()  : bool
Returns a value indicating whether the requested language matches the supported language.
negotiateContentType()  : mixed
Negotiates the response format.
negotiateLanguage()  : string
Negotiates the application language.

Properties

$except

public array<string|int, mixed> $except = []

list of action IDs that this filter should not apply to.

Tags
see
only

$formatParam

public string $formatParam = '_format'

the name of the GET parameter that specifies the response format. Note that if the specified format does not exist in [[formats]], a [[NotAcceptableHttpException]] exception will be thrown. If the parameter value is empty or if this property is null, the response format will be determined based on the Accept HTTP header only.

Tags
see
formats

$formats

public array<string|int, mixed>|null $formats

list of supported response formats. The keys are MIME types (e.g. application/json) while the values are the corresponding formats (e.g. html, json) which must be supported as declared in [[\yii\web\Response::$formatters]].

If this property is empty or not set, response format negotiation will be skipped.

$languageParam

public string $languageParam = '_lang'

the name of the GET parameter that specifies the [[\yii\base\Application::$language|application language]]. Note that if the specified language does not match any of [[languages]], the first language in [[languages]] will be used. If the parameter value is empty or if this property is null, the application language will be determined based on the Accept-Language HTTP header only.

Tags
see
languages

$languages

public array<string|int, mixed>|null $languages

a list of supported languages. The array keys are the supported language variants (e.g. en-GB, en-US), while the array values are the corresponding language codes (e.g. en, de) recognized by the application.

Array keys are not always required. When an array value does not have a key, the matching of the requested language will be based on a language fallback mechanism. For example, a value of en will match en, en_US, en-US, en-GB, etc.

If this property is empty or not set, language negotiation will be skipped.

$only

public array<string|int, mixed> $only = []

list of action IDs that this filter should apply to. If this property is not set, then the filter applies to all actions, unless they are listed in [[except]]. If an action ID appears in both [[only]] and [[except]], this filter will NOT apply to it.

Note that if the filter is attached to a module, the action IDs should also include child module IDs (if any) and controller IDs.

Since version 2.0.9 action IDs can be specified as wildcards, e.g. site/*.

Tags
see
except

$request

public Request $request

the current request. If not set, the request application component will be used.

$response

public Response|null $response

the response to be sent. If not set, the response application component will be used.

$_attachedEvents

private array<string|int, mixed> $_attachedEvents = []

Attached events handlers

Methods

__call()

Calls the named method which is not a class method.

public __call(string $name, array<string|int, mixed> $params) : mixed

Do not call this method directly as it is a PHP magic method that will be implicitly called when an unknown method is being invoked.

Parameters
$name : string

the method name

$params : array<string|int, mixed>

method parameters

Tags
throws
UnknownMethodException

when calling unknown method

Return values
mixed —

the method return value

__construct()

Constructor.

public __construct([array<string|int, mixed> $config = [] ]) : mixed

The default implementation does two things:

  • Initializes the object with the given configuration $config.
  • Call [[init()]].

If this method is overridden in a child class, it is recommended that

  • the last parameter of the constructor is a configuration array, like $config here.
  • call the parent implementation at the end of the constructor.
Parameters
$config : array<string|int, mixed> = []

name-value pairs that will be used to initialize the object properties

__get()

Returns the value of an object property.

public __get(string $name) : mixed

Do not call this method directly as it is a PHP magic method that will be implicitly called when executing $value = $object->property;.

Parameters
$name : string

the property name

Tags
throws
UnknownPropertyException

if the property is not defined

throws
InvalidCallException

if the property is write-only

see
__set()
Return values
mixed —

the property value

__isset()

Checks if a property is set, i.e. defined and not null.

public __isset(string $name) : bool

Do not call this method directly as it is a PHP magic method that will be implicitly called when executing isset($object->property).

Note that if the property is not defined, false will be returned.

Parameters
$name : string

the property name or the event name

Tags
see
https://www.php.net/manual/en/function.isset.php
Return values
bool —

whether the named property is set (not null).

__set()

Sets value of an object property.

public __set(string $name, mixed $value) : mixed

Do not call this method directly as it is a PHP magic method that will be implicitly called when executing $object->property = $value;.

Parameters
$name : string

the property name or the event name

$value : mixed

the property value

Tags
throws
UnknownPropertyException

if the property is not defined

throws
InvalidCallException

if the property is read-only

see
__get()

__unset()

Sets an object property to null.

public __unset(string $name) : mixed

Do not call this method directly as it is a PHP magic method that will be implicitly called when executing unset($object->property).

Note that if the property is not defined, this method will do nothing. If the property is read-only, it will throw an exception.

Parameters
$name : string

the property name

Tags
throws
InvalidCallException

if the property is read only.

see
https://www.php.net/manual/en/function.unset.php

afterAction()

This method is invoked right after an action is executed.

public afterAction(Action $action, mixed $result) : mixed

You may override this method to do some postprocessing for the action.

Parameters
$action : Action

the action just executed.

$result : mixed

the action execution result

Return values
mixed —

the processed action result.

attach()

Attaches the behavior object to the component.

public attach(mixed $owner) : mixed
Parameters
$owner : mixed

the component that this behavior is to be attached to.

beforeAction()

This method is invoked right before an action is to be executed (after all possible filters.) You may override this method to do last-minute preparation for the action.

public beforeAction(mixed $action) : bool
Parameters
$action : mixed

the action to be executed.

Return values
bool —

whether the action should continue to be executed.

bootstrap()

Bootstrap method to be called during application bootstrap stage.

public bootstrap(mixed $app) : mixed
Parameters
$app : mixed

the application currently running

canGetProperty()

Returns a value indicating whether a property can be read.

public canGetProperty(string $name[, bool $checkVars = true ]) : bool

A property is readable if:

  • the class has a getter method associated with the specified name (in this case, property name is case-insensitive);
  • the class has a member variable with the specified name (when $checkVars is true);
Parameters
$name : string

the property name

$checkVars : bool = true

whether to treat member variables as properties

Tags
see
canSetProperty()
Return values
bool —

whether the property can be read

canSetProperty()

Returns a value indicating whether a property can be set.

public canSetProperty(string $name[, bool $checkVars = true ]) : bool

A property is writable if:

  • the class has a setter method associated with the specified name (in this case, property name is case-insensitive);
  • the class has a member variable with the specified name (when $checkVars is true);
Parameters
$name : string

the property name

$checkVars : bool = true

whether to treat member variables as properties

Tags
see
canGetProperty()
Return values
bool —

whether the property can be written

className()

Returns the fully qualified name of this class.

public static className() : string
Tags
deprecated

since 2.0.14. On PHP >=5.5, use ::class instead.

Return values
string —

the fully qualified name of this class.

detach()

Detaches the behavior object from the component.

public detach() : mixed

events()

Declares event handlers for the [[owner]]'s events.

public events() : array<string|int, mixed>

Child classes may override this method to declare what PHP callbacks should be attached to the events of the [[owner]] component.

The callbacks will be attached to the [[owner]]'s events when the behavior is attached to the owner; and they will be detached from the events when the behavior is detached from the component.

The callbacks can be any of the following:

  • method in this behavior: 'handleClick', equivalent to [$this, 'handleClick']
  • object method: [$object, 'handleClick']
  • static method: ['Page', 'handleClick']
  • anonymous function: function ($event) { ... }

The following is an example:

[
    Model::EVENT_BEFORE_VALIDATE => 'myBeforeValidate',
    Model::EVENT_AFTER_VALIDATE => 'myAfterValidate',
]
Return values
array<string|int, mixed> —

events (array keys) and the corresponding event handler methods (array values).

hasMethod()

Returns a value indicating whether a method is defined.

public hasMethod(string $name) : bool

The default implementation is a call to php function method_exists(). You may override this method when you implemented the php magic method __call().

Parameters
$name : string

the method name

Return values
bool —

whether the method is defined

hasProperty()

Returns a value indicating whether a property is defined.

public hasProperty(string $name[, bool $checkVars = true ]) : bool

A property is defined if:

  • the class has a getter or setter method associated with the specified name (in this case, property name is case-insensitive);
  • the class has a member variable with the specified name (when $checkVars is true);
Parameters
$name : string

the property name

$checkVars : bool = true

whether to treat member variables as properties

Tags
see
canGetProperty()
see
canSetProperty()
Return values
bool —

whether the property is defined

init()

Initializes the object.

public init() : mixed

This method is invoked at the end of the constructor after the object is initialized with the given configuration.

negotiate()

Negotiates the response format and application language.

public negotiate() : mixed

getActionId()

Returns an action ID by converting [[Action::$uniqueId]] into an ID relative to the module.

protected getActionId(Action $action) : string
Parameters
$action : Action
Tags
since
2.0.7
Return values
string

isActive()

Returns a value indicating whether the filter is active for the given action.

protected isActive(Action $action) : bool
Parameters
$action : Action

the action being filtered

Return values
bool —

whether the filter is active for the given action.

isLanguageSupported()

Returns a value indicating whether the requested language matches the supported language.

protected isLanguageSupported(string $requested, string $supported) : bool
Parameters
$requested : string

the requested language code

$supported : string

the supported language code

Return values
bool —

whether the requested language is supported

negotiateLanguage()

Negotiates the application language.

protected negotiateLanguage(Request $request) : string
Parameters
$request : Request
Return values
string —

the chosen language


        

        
    




    

    

                                

                

                                
    

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