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Negotiation

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Negotiation



Negotiation is a standalone library without any dependencies that allows you
to implement content
negotiation in your
application, whatever framework you use. This library is based on RFC
7231. Negotiation is easy to use, and
extensively unit tested!

Important: You are browsing the documentation of Negotiation 3.x+.
Documentation for version 1.x is available here: Negotiation 1.x
documentation.
Documentation for version 2.x is available here: Negotiation 2.x
documentation.

Installation

The recommended way to install Negotiation is through
Composer:

$ composer require willdurand/negotiation

Usage Examples

Media Type Negotiation 

$negotiator = new NegotiationNegotiator();

$acceptHeader = 'text/html, application/xhtml+xml, application/xml;q=0.9, */*;q=0.8';
$priorities   = array('text/html; charset=UTF-8', 'application/json', 'application/xml;q=0.5');

$mediaType = $negotiator->getBest($acceptHeader, $priorities);

$value = $mediaType->getValue();
// $value == 'text/html; charset=UTF-8'

The Negotiator returns an instance of Accept, or null if negotiating the
best media type has failed.

Language Negotiation 

<?php

$negotiator = new NegotiationLanguageNegotiator();

$acceptLanguageHeader = 'en; q=0.1, fr; q=0.4, fu; q=0.9, de; q=0.2';
$priorities          = array('de', 'fu', 'en');

$bestLanguage = $negotiator->getBest($acceptLanguageHeader, $priorities);

$type = $bestLanguage->getType();
// $type == 'fu';

$quality = $bestLanguage->getQuality();
// $quality == 0.9

The LanguageNegotiator returns an instance of AcceptLanguage.

Encoding Negotiation 

<?php

$negotiator = new NegotiationEncodingNegotiator();
$encoding   = $negotiator->getBest($acceptHeader, $priorities);

The EncodingNegotiator returns an instance of AcceptEncoding.

Charset Negotiation 

<?php

$negotiator = new NegotiationCharsetNegotiator();

$acceptCharsetHeader = 'ISO-8859-1, UTF-8; q=0.9';
$priorities          = array('iso-8859-1;q=0.3', 'utf-8;q=0.9', 'utf-16;q=1.0');

$bestCharset = $negotiator->getBest($acceptCharsetHeader, $priorities);

$type = $bestCharset->getType();
// $type == 'utf-8';

$quality = $bestCharset->getQuality();
// $quality == 0.81

The CharsetNegotiator returns an instance of AcceptCharset.

Accept* Classes

Accept and Accept* classes share common methods such as:

  • getValue() returns the accept value (e.g. text/html; z=y; a=b; c=d)
  • getNormalizedValue() returns the value with parameters sorted (e.g.
    text/html; a=b; c=d; z=y)
  • getQuality() returns the quality if available (q parameter)
  • getType() returns the accept type (e.g. text/html)
  • getParameters() returns the set of parameters (excluding the q parameter
    if provided)
  • getParameter() allows to retrieve a given parameter by its name. Fallback to
    a $default (nullable) value otherwise.
  • hasParameter() indicates whether a parameter exists.

Versioning

Negotiation follows Semantic Versioning.

End Of Life

1.x

As of October 2016, branch
1.x is not supported
anymore, meaning major version 1 reached end of life. Last version is:
1.5.0.

2.x

As of November 2020, branch
2.x is not supported
anymore, meaning major version 2 reached end of life. Last version is:
2.3.1.

Stable Version

3.x (and dev-master)

Negotiation 3.0
has been released on November 26th, 2020. This is the current stable version
and it is in sync with the main branch (a.k.a. master).

Unit Tests

Setup the test suite using Composer:

$ composer install --dev

Run it using PHPUnit:

$ phpunit

Contributing

See CONTRIBUTING file.

Credits

  • Some parts of this library are inspired by:

    • Symfony framework;
    • FOSRest;
    • PEAR HTTP2.
  • William Durand
  • @neural-wetware

License

Negotiation is released under the MIT License. See the bundled LICENSE file for
details.



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