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fixes #680, #875 and #1028: improve detection for browser preferred languages

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This commit is contained in:
Arnie97
2019-12-03 15:14:14 +08:00
committed by Pierrick Le Gall
parent cf7c6b1b9e
commit 9b22164adc
1 changed files with 60 additions and 4 deletions
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include/functions_user.inc.php
+60 -4
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@@ -797,20 +797,76 @@ function get_default_language()
/**
* Tries to find the browser language among available languages.
* @todo : try to match 'fr_CA' before 'fr'
*
* @return string
*/
function get_browser_language()
{
$browser_language = substr(@$_SERVER["HTTP_ACCEPT_LANGUAGE"], 0, 2);
$language_header = @$_SERVER['HTTP_ACCEPT_LANGUAGE'];
if ($language_header == '')
{
return false;
}
// case insensitive match
// 'en-US;q=0.9, fr-CH, kok-IN;q=0.7' => 'en_us;q=0.9, fr_ch, kok_in;q=0.7'
$language_header = strtolower(str_replace("-", "_", $language_header));
$match_pattern = '/(([a-z]{1,8})(?:_[a-z0-9]{1,8})*)\s*(?:;\s*q\s*=\s*([01](?:\.[0-9]{0,3})?))?/';
$matches = null;
preg_match_all($match_pattern, $language_header, $matches);
$accept_languages_full = $matches[1]; // ['en-us', 'fr-ch', 'kok-in']
$accept_languages_short = $matches[2]; // ['en', 'fr', 'kok']
if (!count($accept_languages_full))
{
return false;
}
// if the quality value is absent for an language, use 1 as the default
$q_values = $matches[3]; // ['0.9', '', '0.7']
foreach ($q_values as $i => $q_value)
{
$q_values[$i] = ($q_values[$i] === '') ? 1 : floatval($q_values[$i]);
}
// since quick sort is not stable,
// sort by $indices explicitly after sorting by $q_values
$indices = range(1, count($q_values));
array_multisort(
$q_values, SORT_DESC, SORT_NUMERIC,
$indices, SORT_ASC, SORT_NUMERIC,
$accept_languages_full,
$accept_languages_short
);
// list all enabled language codes in the Piwigo installation
// in both full and short forms, and case insensitive
$languages_available = array();
foreach (get_languages() as $language_code => $language_name)
{
if (substr($language_code, 0, 2) == $browser_language)
$lowercase_full = strtolower($language_code);
$lowercase_parts = explode('_', $lowercase_full, 2);
$lowercase_prefix = $lowercase_parts[0];
$languages_available[$lowercase_full] = $language_code;
$languages_available[$lowercase_prefix] = $language_code;
}
foreach ($q_values as $i => $q_value)
{
// if the exact language variant is present, make sure it's chosen
// en-US;q=0.9 => en_us => en_US
if (array_key_exists($accept_languages_full[$i], $languages_available))
{
return $language_code;
return $languages_available[$accept_languages_full[$i]];
}
// only in case that an exact match was not available,
// should we fallback to other variants in the same language family
// fr_CH => fr => fr_FR
else if (array_key_exists($accept_languages_short[$i], $languages_available))
{
return $languages_available[$accept_languages_short[$i]];
}
}
return false;
}