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implementing media type negotiation (based on language negotiation

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logic) in cases both JSON and (X)HTML are being requested, resolving #68
This commit is contained in:
El RIDO
2016-04-08 23:29:44 +02:00
parent 9593ba7039
commit 3a92c940a9
4 changed files with 151 additions and 12 deletions
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107
lib/request.php
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@@ -17,6 +17,27 @@
*/
class request
{
/**
* MIME type for JSON
*
* @const string
*/
const MIME_JSON = 'application/json';
/**
* MIME type for HTML
*
* @const string
*/
const MIME_HTML = 'text/html';
/**
* MIME type for XHTML
*
* @const string
*/
const MIME_XHTML = 'application/xhtml+xml';
/**
* Input stream to use for PUT parameter parsing.
*
@@ -66,15 +87,7 @@ class request
}
// decide if we are in JSON API or HTML context
if (
(array_key_exists('HTTP_X_REQUESTED_WITH', $_SERVER) &&
$_SERVER['HTTP_X_REQUESTED_WITH'] == 'JSONHttpRequest') ||
(array_key_exists('HTTP_ACCEPT', $_SERVER) &&
strpos($_SERVER['HTTP_ACCEPT'], 'application/json') !== false)
)
{
$this->_isJsonApi = true;
}
$this->_isJsonApi = $this->_detectJsonRequest();
// parse parameters, depending on request type
switch (array_key_exists('REQUEST_METHOD', $_SERVER) ? $_SERVER['REQUEST_METHOD'] : 'GET')
@@ -168,4 +181,80 @@ class request
{
self::$_inputStream = $input;
}
/**
* detect the clients supported media type and decide if its a JSON API call or not
*
* Adapted from: http://stackoverflow.com/questions/3770513/detect-browser-language-in-php#3771447
*
* @access private
* @return bool
*/
private function _detectJsonRequest()
{
$hasAcceptHeader = array_key_exists('HTTP_ACCEPT', $_SERVER);
$acceptHeader = $hasAcceptHeader ? $_SERVER['HTTP_ACCEPT'] : '';
// simple cases
if (
(array_key_exists('HTTP_X_REQUESTED_WITH', $_SERVER) &&
$_SERVER['HTTP_X_REQUESTED_WITH'] == 'JSONHttpRequest') ||
($hasAcceptHeader &&
strpos($acceptHeader, self::MIME_JSON) !== false &&
strpos($acceptHeader, self::MIME_HTML) === false &&
strpos($acceptHeader, self::MIME_XHTML) === false)
)
{
return true;
}
// advanced case: media type negotiation
$mediaTypes = array();
if ($hasAcceptHeader)
{
$mediaTypeRanges = explode(',', trim($acceptHeader));
foreach ($mediaTypeRanges as $mediaTypeRange)
{
if (preg_match(
'#(\*/\*|[a-z\-]+/[a-z\-+*]+(?:\s*;\s*[^q]\S*)*)(?:\s*;\s*q\s*=\s*(0(?:\.\d{0,3})|1(?:\.0{0,3})))?#',
trim($mediaTypeRange), $match
))
{
if (!isset($match[2]))
{
$match[2] = '1.0';
}
else
{
$match[2] = (string) floatval($match[2]);
}
if (!isset($mediaTypes[$match[2]]))
{
$mediaTypes[$match[2]] = array();
}
$mediaTypes[$match[2]][] = strtolower($match[1]);
}
}
krsort($mediaTypes);
foreach ($mediaTypes as $acceptedQuality => $acceptedValues)
{
if ($acceptedQuality === 0.0) continue;
foreach ($acceptedValues as $acceptedValue)
{
if (
strpos($acceptedValue, self::MIME_HTML) === 0 ||
strpos($acceptedValue, self::MIME_XHTML) === 0
)
{
return false;
}
elseif (strpos($acceptedValue, self::MIME_JSON) === 0)
{
return true;
}
}
}
}
return false;
}
}