Created
August 2, 2010 20:37
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<?php | |
// Make a request to the AWIS UrlInfo operation to get information about a given url | |
define("ACCESS_KEY_ID", "AKIAJ3YW5P7V72MBANJA"); | |
define("SECRET_ACCESS_KEY", "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"); | |
define("SERVICE_ENDPOINT", "http://awis.amazonaws.com?"); | |
define("ACTION", "UrlInfo"); | |
define("RESPONSE_GROUP", "Rank,LinksInCount"); | |
function start_tag($parser, $name) { | |
global $current_tag, $results; | |
$current_tag = $name; | |
} | |
function end_tag() { | |
global $current_tag; | |
$current_tag = ''; | |
} | |
function contents($parser, $data) { | |
global $current_tag, $results; | |
switch ($current_tag) { | |
case "aws:LinksInCount": | |
$results['linksincount'] .= $data; | |
break; | |
case "aws:Rank": | |
$results['rank'] .= $data; | |
break; | |
} | |
} | |
class Alexa_module extends Model{ | |
function alexaData(){ | |
$site_url = "stompergames.com"; | |
$awis_url = $this->generate_url($site_url); | |
$result = $this->make_http_request($awis_url); | |
$current_tag = ""; | |
$xml_parser = xml_parser_create(""); | |
xml_parser_set_option($xml_parser, XML_OPTION_CASE_FOLDING, false); | |
xml_set_element_handler($xml_parser, "start_tag", "end_tag"); | |
xml_set_character_data_handler($xml_parser, "contents"); | |
xml_parse($xml_parser, $result, true); | |
xml_parser_free($xml_parser); | |
echo ("Other sites that link to this site: ".$results['linksincount']."\n"); | |
echo ("Rank: ".$results['rank']."\n"); | |
} | |
// Returns the AWS url to get AWIS information for the given site | |
function generate_url($site_url) { | |
$timestamp = $this->generate_timestamp(); | |
$site_enc = urlencode($site_url); | |
$timestamp_enc = urlencode($timestamp); | |
$signature_enc = urlencode($this->calculate_RFC2104HMAC(ACTION . $timestamp, SECRET_ACCESS_KEY)); | |
return SERVICE_ENDPOINT | |
. "AWSAccessKeyId=".ACCESS_KEY_ID | |
. "&Action=".ACTION | |
. "&ResponseGroup=".RESPONSE_GROUP | |
. "&Timestamp=$timestamp_enc" | |
. "&Signature=$signature_enc" | |
. "&Url=$site_enc"; | |
} | |
// Calculate signature using HMAC: http://www.faqs.org/rfcs/rfc2104.html | |
function calculate_RFC2104HMAC ($data, $key) { | |
return base64_encode ( | |
pack("H*", sha1((str_pad($key, 64, chr(0x00)) | |
^(str_repeat(chr(0x5c), 64))) . | |
pack("H*", sha1((str_pad($key, 64, chr(0x00)) | |
^(str_repeat(chr(0x36), 64))) . $data)))) | |
); | |
} | |
// Timestamp format: yyyy-MM-dd'T'HH:mm:ss.SSS'Z' | |
function generate_timestamp () { | |
return gmdate("Y-m-d\TH:i:s.\\0\\0\\0\\Z", time()); | |
} | |
// Make an http request to the specified URL and return the result | |
function make_http_request($url){ | |
$ch = curl_init($url); | |
curl_setopt($ch, CURLOPT_TIMEOUT, 4); | |
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); | |
$result = curl_exec($ch); | |
curl_close($ch); | |
return $result; | |
} | |
} |
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