Linux, Apache, MySQL, PHP

function GetRequestToken()
{
	$consumer = 'YOUR_CONSUMER_KEY';
	$secret = 'YOUR_CONSUMER_SECRETE';
	$callback = 'http://localhost/Gcontacts/welcome/redirection';
	$sign_method = 'HMAC-SHA1';
	$version = '1.0';
	$scope = 'https://www.google.com/m8/feeds/';
	$path = "/accounts/OAuthGetRequestToken";	 
	$mt = microtime();
	$rand = mt_rand();
	$nonce = md5($mt.$rand);
	$time = time();
	$url = 'https://www.google.com/accounts/OAuthGetRequestToken';		
	$post = array(
	    'oauth_callback' => $callback,
	    'oauth_consumer_key' => $consumer,
	    'oauth_nonce' => $nonce,
	    'oauth_signature_method' => $sign_method,
	    'oauth_timestamp' => $time,
	    'oauth_version' => $version,
	    'scope' => $scope
		);
	$post_string1 = '';
	foreach($post as $key => $value)
	{
         	$post_string1 .= $key.'='.($value).'&';
	}
	$post_string1 = trim($post_string1, '&');
		
	$key_part = $this->urlencodeRFC3986($secret);
	$key = $key_part;
	$base_string = $this->calculateBaseString($scope, "GET", $post);
	echo $base_string;
	$signature = base64_encode(hash_hmac('sha1', $base_string, $key,true));
	$post_string1 .= 'oauth_signature'.'='.urlencode($signature);
			$post['oauth_signature'] = $signature;

	$header[] = 'POST'.$path.'?scope='.$scope.' HTTP/1.1';
	$header[] = 'Content-Type: application/x-www-form-urlencoded';
	$header[] = 'Accept: */*';	
	$header[] = $this->calculateHeader($post).', Content-Type: application/x-www-form-urlencoded ,Host: www.google.com';			
	$ch = curl_init();		
	curl_setopt($ch, CURLOPT_POSTFIELDS, $post_string1);
	curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
	curl_setopt($ch, CURLOPT_URL, $url);
	curl_setopt($ch, CURLOPT_POSTFIELDS, 'scope='.$scope);
	curl_setopt($ch, CURLOPT_SSL_VERIFYPEER,false);
	curl_setopt($ch, CURLOPT_POST,1);
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
	curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
	$result = curl_exec($ch);
	curl_close($ch);
}

private static function urlencode_rfc3986($value)
	{
		if(is_array($value)) return array_map(array('Welcome_model', 'urlencode_rfc3986'), $value);
		else
		{
			$search = array('+', ' ', '%7E', '%');
			$replace = array('%20', '%20', '~', '%25');

			return str_replace($search, $replace, urlencode($value));
		}
	}
	
function calculateBaseString($url, $method, array $parameters)
	{
		$url = (string) $url;
		$pairs = array();
		$chunks = array();

		// sort parameters by key
		uksort($parameters, 'strcmp');

		// loop parameters
		foreach($parameters as $key => $value)
		{
			// sort by value
			if(is_array($value)) $parameters[$key] = natsort($value);
		}

		// process queries
		foreach($parameters as $key => $value)
		{
			// only add if not already in the url
			if(substr_count($url, $key . '=' . $value) == 0) $chunks[] = self::urlencode_rfc3986($key) . '%3D' . self::urlencode_rfc3986($value);
		}

		// buils base
		$base = $method . '&';
		$base .= urlencode($url);
		$base .= (substr_count($url, '?')) ? '%26' : '&';
		$base .= implode('%26', $chunks);
		$base = str_replace('%3F', '&', $base);

		// return
//		echo $base;exit;
		return $base;
	}

	
function calculateHeader(array $parameters)
	{
		// redefine
//		$url = (string) $url;

		// divide into parts
//		$parts = parse_url($url);

		// init var
		$chunks = array();

		// process queries
		foreach($parameters as $key => $value) $chunks[] = str_replace('%25', '%', self::urlencode_rfc3986($key) . '="' . self::urlencode_rfc3986($value) . '"');

		// build return
		$return = 'Authorization: OAuth ';
		$return .= implode(',', $chunks);

		// prepend name and OAuth part
//		echo $return;exit;
		return $return;
	}
	
	function urlencodeRFC3986($string)
{
	return urlencode($string);
}