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Implemented language negotiation.

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Implemented Request::getAcceptedContentTypes().
This commit is contained in:
Qiang Xue
2013-06-17 15:51:30 -04:00
parent 4782b19739
commit 3e6419108f
1 changed files with 115 additions and 22 deletions
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137
framework/yii/web/Request.php
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@@ -658,40 +658,133 @@ class Request extends \yii\base\Request
}
}
private $_preferredLanguages;
private $_contentTypes;
/**
* Returns the user preferred languages.
* The languages returned are ordered by user's preference, starting with the language that the user
* prefers the most.
* @return string the user preferred languages. An empty array may be returned if the user has no preference.
* Returns the content types accepted by the end user.
* This is determined by the `Accept` HTTP header.
* @return array the content types ordered by the preference level. The first element
* represents the most preferred content type.
*/
public function getPreferredLanguages()
public function getAcceptedContentTypes()
{
if ($this->_preferredLanguages === null) {
if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE']) && ($n = preg_match_all('/([\w\-_]+)\s*(;\s*q\s*=\s*(\d*\.\d*))?/', $_SERVER['HTTP_ACCEPT_LANGUAGE'], $matches)) > 0) {
$languages = array();
for ($i = 0; $i < $n; ++$i) {
$languages[$matches[1][$i]] = empty($matches[3][$i]) ? 1.0 : floatval($matches[3][$i]);
}
arsort($languages);
$this->_preferredLanguages = array_keys($languages);
if ($this->_contentTypes === null) {
if (isset($_SERVER['HTTP_ACCEPT'])) {
$this->_contentTypes = $this->parseAcceptHeader($_SERVER['HTTP_ACCEPT']);
} else {
$this->_preferredLanguages = array();
$this->_contentTypes = array();
}
}
return $this->_preferredLanguages;
return $this->_contentTypes;
}
/**
* Returns the language most preferred by the user.
* @return string|boolean the language most preferred by the user. If the user has no preference, false
* will be returned.
* @param array $value the content types that are accepted by the end user. They should
* be ordered by the preference level.
*/
public function getPreferredLanguage()
public function setAcceptedContentTypes($value)
{
$languages = $this->getPreferredLanguages();
return isset($languages[0]) ? $languages[0] : false;
$this->_contentTypes = $value;
}
private $_languages;
/**
* Returns the languages accepted by the end user.
* This is determined by the `Accept-Language` HTTP header.
* @return array the languages ordered by the preference level. The first element
* represents the most preferred language.
*/
public function getAcceptedLanguages()
{
if ($this->_languages === null) {
if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
$this->_languages = $this->parseAcceptHeader($_SERVER['HTTP_ACCEPT_LANGUAGE']);
} else {
$this->_languages = array();
}
}
return $this->_languages;
}
/**
* @param array $value the languages that are accepted by the end user. They should
* be ordered by the preference level.
*/
public function setAcceptedLanguages($value)
{
$this->_languages = $value;
}
/**
* Parses the given `Accept` (or `Accept-Language`) header.
* This method will return the accepted values ordered by their preference level.
* @param string $header the header to be parsed
* @return array the accept values ordered by their preference level.
*/
protected function parseAcceptHeader($header)
{
$accepts = array();
$n = preg_match_all('/\s*([\w\/\-\*]+)\s*(?:;\s*q\s*=\s*([\d\.]+))?[^,]*/', $header, $matches, PREG_SET_ORDER);
for ($i = 0; $i < $n; ++$i) {
if (!empty($matches[$i][1])) {
$accepts[] = array($matches[$i][1], isset($matches[$i][2]) ? (float)$matches[$i][2] : 1, $i);
}
}
usort($accepts, function ($a, $b) {
if ($a[1] > $b[1]) {
return -1;
} elseif ($a[1] < $b[1]) {
return 1;
} elseif ($a[0] === $b[0]) {
return $a[2] > $b[2] ? 1 : -1;
} elseif ($a[0] === '*/*') {
return 1;
} elseif ($b[0] === '*/*') {
return -1;
} else {
$wa = $a[0][strlen($a[0]) - 1] === '*';
$wb = $b[0][strlen($b[0]) - 1] === '*';
if ($wa xor $wb) {
return $wa ? 1 : -1;
} else {
return $a[2] > $b[2] ? 1 : -1;
}
}
});
$result = array();
foreach ($accepts as $accept) {
$result[] = $accept[0];
}
return array_unique($result);
}
/**
* Returns the user-preferred language that should be used by this application.
* The language resolution is based on the user preferred languages and the languages
* supported by the application. The method will try to find the best match.
* @param array $languages a list of the languages supported by the application.
* If empty, this method will return the first language returned by [[getAcceptedLanguages()]].
* @return string the language that the application should use. Null is returned if both [[getAcceptedLanguages()]]
* and `$languages` are empty.
*/
public function getPreferredLanguage($languages = array())
{
$acceptedLanguages = $this->getAcceptedLanguages();
if (empty($languages)) {
return isset($acceptedLanguages[0]) ? $acceptedLanguages[0] : null;
}
foreach ($acceptedLanguages as $acceptedLanguage) {
$acceptedLanguage = str_replace('-', '_', strtolower($acceptedLanguage));
foreach ($languages as $language) {
$language = str_replace('-', '_', strtolower($language));
// en_us==en_us, en==en_us, en_us==en
if ($language === $acceptedLanguage || strpos($acceptedLanguage, $language . '_') === 0 || strpos($language, $acceptedLanguage . '_') === 0) {
return $language;
}
}
}
return reset($languages);
}
/**