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<?php
/**
* Twitter-API-PHP : Simple PHP wrapper for the v1.1 API
*
* PHP version 5.3.10
*
* @category Awesomeness
* @package Twitter-API-PHP
* @author James Mallison <me@j7mbo.co.uk>
* @license http://opensource.org/licenses/gpl-license.php GNU Public License
* @link http://github.com/j7mbo/twitter-api-php
*/
class TwitterAPIExchange
{
private $oauth_access_token;
private $oauth_access_token_secret;
private $consumer_key;
private $consumer_secret;
private $postfields;
private $getfield;
protected $oauth;
public $url;
/**
* Create the API access object. Requires an array of settings::
* oauth access token, oauth access token secret, consumer key, consumer secret
* These are all available by creating your own application on dev.twitter.com
* Requires the cURL library
*
* @param array $settings
*/
public function __construct(array $settings)
{
if (!in_array('curl', get_loaded_extensions()))
{
throw new Exception('You need to install cURL, see: http://curl.haxx.se/docs/install.html');
}
if (!isset($settings['oauth_access_token'])
|| !isset($settings['oauth_access_token_secret'])
|| !isset($settings['consumer_key'])
|| !isset($settings['consumer_secret']))
{
throw new Exception('Make sure you are passing in the correct parameters');
}
$this->oauth_access_token = $settings['oauth_access_token'];
$this->oauth_access_token_secret = $settings['oauth_access_token_secret'];
$this->consumer_key = $settings['consumer_key'];
$this->consumer_secret = $settings['consumer_secret'];
}
/**
* Set postfields array, example: array('screen_name' => 'J7mbo')
*
* @param array $array Array of parameters to send to API
*
* @return TwitterAPIExchange Instance of self for method chaining
*/
public function setPostfields(array $array)
{
if (!is_null($this->getGetfield()))
{
throw new Exception('You can only choose get OR post fields.');
}
if (isset($array['status']) && substr($array['status'], 0, 1) === '@')
{
$array['status'] = sprintf("\0%s", $array['status']);
}
$this->postfields = $array;
return $this;
}
/**
* Set getfield string, example: '?screen_name=J7mbo'
*
* @param string $string Get key and value pairs as string
*
* @return \TwitterAPIExchange Instance of self for method chaining
*/
public function setGetfield($string)
{
if (!is_null($this->getPostfields()))
{
throw new Exception('You can only choose get OR post fields.');
}
$search = array('#', ',', '+', ':');
$replace = array('%23', '%2C', '%2B', '%3A');
$string = str_replace($search, $replace, $string);
$this->getfield = $string;
return $this;
}
/**
* Get getfield string (simple getter)
*
* @return string $this->getfields
*/
public function getGetfield()
{
return $this->getfield;
}
/**
* Get postfields array (simple getter)
*
* @return array $this->postfields
*/
public function getPostfields()
{
return $this->postfields;
}
/**
* Build the Oauth object using params set in construct and additionals
* passed to this method. For v1.1, see: https://dev.twitter.com/docs/api/1.1
*
* @param string $url The API url to use. Example: https://api.twitter.com/1.1/search/tweets.json
* @param string $requestMethod Either POST or GET
* @return \TwitterAPIExchange Instance of self for method chaining
*/
public function buildOauth($url, $requestMethod)
{
if (!in_array(strtolower($requestMethod), array('post', 'get')))
{
throw new Exception('Request method must be either POST or GET');
}
$consumer_key = $this->consumer_key;
$consumer_secret = $this->consumer_secret;
$oauth_access_token = $this->oauth_access_token;
$oauth_access_token_secret = $this->oauth_access_token_secret;
$oauth = array(
'oauth_consumer_key' => $consumer_key,
'oauth_nonce' => time(),
'oauth_signature_method' => 'HMAC-SHA1',
'oauth_token' => $oauth_access_token,
'oauth_timestamp' => time(),
'oauth_version' => '1.0'
);
$getfield = $this->getGetfield();
if (!empty($getfield))
{
$getfields = str_replace('?', '', explode('&', $getfield));
foreach ($getfields as $g)
{
$split = explode('=', $g);
$oauth[$split[0]] = $split[1];
}
}
$base_info = $this->buildBaseString($url, $requestMethod, $oauth);
$composite_key = rawurlencode($consumer_secret) . '&' . rawurlencode($oauth_access_token_secret);
$oauth_signature = base64_encode(hash_hmac('sha1', $base_info, $composite_key, true));
$oauth['oauth_signature'] = $oauth_signature;
$this->url = $url;
$this->oauth = $oauth;
return $this;
}
/**
* Perform the acual data retrieval from the API
*
* @param boolean $return If true, returns data.
*
* @return json If $return param is true, returns json data.
*/
public function performRequest($return = true)
{
if (!is_bool($return))
{
throw new Exception('performRequest parameter must be true or false');
}
if($this->isCurlInstalled()) {
$header = array($this->buildAuthorizationHeader($this->oauth), 'Expect:');
$getfield = $this->getGetfield();
$postfields = $this->getPostfields();
$options = array(
CURLOPT_HTTPHEADER => $header,
CURLOPT_HEADER => false,
CURLOPT_URL => $this->url,
CURLOPT_RETURNTRANSFER => true,
CURLOPT_SSL_VERIFYPEER => false
);
if (!is_null($postfields))
{
$options[CURLOPT_POSTFIELDS] = $postfields;
}
else
{
if ($getfield !== '')
{
$options[CURLOPT_URL] .= $getfield;
}
}
$feed = curl_init();
curl_setopt_array($feed, $options);
$json = curl_exec($feed);
curl_close($feed);
if ($return) { return $json; }
} else {
//Use Socket instead
$response = '';
$getfield = $this->getGetfield();
$out = parse_url($this->url.$getfield);
$errno = $errstr = '';
$host = $out['host'];
$path = $out['path'] . '?' . $out['query'];
$header = "GET $path HTTP/1.1\r\n";
$header .= "Host: $host\r\n";
$header .= "Content-Type: application/x-www-form-urlencoded\r\n";
$header .= "Accept-Encoding: none\r\n";
$header .= $this->buildAuthorizationHeaderForSocket($this->oauth)."\r\n\r\n";
//$header .= "Connection: Close\r\n\r\n";
$sock = fsockopen("ssl://".$host, 443, $errno, $errstr, 100);
if (!$sock) {
return null;
} else {
fwrite($sock, $header);
do {
$header .= @fread($sock, 1);
} while (!preg_match('/\\r\\n\\r\\n$/', $header));
while (!feof($sock)) {
$response .= fgets($sock, 128);
}
fclose($sock);
return $response;
}
}
}
/**
* check curl installed
*
* @return void.
*/
public function isCurlInstalled()
{
if (function_exists('curl_version') == "Enabled") {
return true;
} else {
if (in_array('curl', get_loaded_extensions())) {
return true;
} else {
return false;
}
}
}
/**
* Private method to generate the base string used by cURL
*
* @param string $baseURI
* @param string $method
* @param string $params
*
* @return string Built base string
*/
private function buildBaseString($baseURI, $method, $params)
{
$return = array();
ksort($params);
foreach($params as $key=>$value)
{
$return[] = "$key=" . $value;
}
return $method . "&" . rawurlencode($baseURI) . '&' . rawurlencode(implode('&', $return));
}
/**
* Private method to generate authorization header used by cURL
*
* @param array $oauth Array of oauth data generated by buildOauth()
*
* @return string $return Header used by cURL for request
*/
private function buildAuthorizationHeader($oauth)
{
$return = 'Authorization: OAuth ';
$values = array();
foreach($oauth as $key => $value)
{
$values[] = "$key=\"" . rawurlencode($value) . "\"";
}
$return .= implode(', ', $values);
return $return;
}
/**
* Private method to generate authorization header used by socket
*
* @param array $oauth Array of oauth data generated by buildOauth()
*
* @return string $return Header used by socket for request
*/
public function buildAuthorizationHeaderForSocket($oauth, $realm=null) {
$first = true;
if($realm) {
$out = 'Authorization: OAuth realm="' . $this->urlencode_rfc3986($realm) . '"';
$first = false;
} else
$out = 'Authorization: OAuth';
$total = array();
foreach ($oauth as $k => $v) {
if (substr($k, 0, 5) != "oauth") continue;
if (is_array($v)) {
throw new Exception('Arrays not supported in headers');
}
$out .= ($first) ? ' ' : ', ';
$out .= $this->urlencode_rfc3986($k) .
'="' .
$this->urlencode_rfc3986($v) .
'"';
$first = false;
}
return $out;
}
public function urlencode_rfc3986($input) {
if (is_array($input)) {
return array_map(array($this, 'urlencode_rfc3986'), $input);
} else if (is_scalar($input)) {
$tmp1=str_replace('%7E', '~', rawurlencode($input));
$tmp2=str_replace(".","%2E",$tmp1);
$tmp3=str_replace("*","%2A",$tmp2);
$tmp4=str_replace( '+', ' ',$tmp3);
$tmp=str_replace("-","%2D",$tmp4);
return $tmp;
}
else {
return '';
}
}
}
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