<?php

/**
 * Copyright (C) Alibaba Cloud Computing
 * All rights reserved
 */

class Aliyun_Log_Util {

    /**
     * Get the local machine ip address.
     *
     * @return string
     */
    public static function getLocalIp() {
        $local_ip = getHostByName(php_uname('n'));
        if(strlen($local_ip) == 0){
            $local_ip = getHostByName(getHostName());
        }
        return $local_ip;
    }
    
    /**
     * If $gonten is raw IP address, return true.
     *
     * @return bool
     */
    public static function isIp($gonten){
        $ip = explode(".", $gonten);
        for($i=0;$i<count($ip);++$i)
            if($ip[$i]>255)
                return 0;
        return preg_match("/^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$/", $gonten);
    }
    
    /**
     * Calculate string $value MD5.
     *
     * @return string
     */
    public static function calMD5($value) {
        return strtoupper(md5($value));
    }
    
    /**
     * Calculate string $content hmacSHA1 with secret key $key.
     *
     * @return string
     */
    public static function hmacSHA1($content, $key) {
        $signature = hash_hmac("sha1", $content, $key, true);
        return base64_encode($signature);
    }
    
    /**
     * Change $logGroup to bytes.
     *
     * @return string
     */
    public static function toBytes($logGroup) {
        $mem = fopen("php://memory", "rwb");
        $logGroup->write($mem);
        rewind($mem);
        $bytes="";
      
        if(feof($mem)===false){
            $bytes = fread($mem, 10*1024*1024);
        }
        fclose($mem);

        return $bytes;
        
         //$mem = fopen("php://memory", "wb");
      /*   $fiveMBs = 5*1024*1024;
         $mem = fopen("php://temp/maxmemory:$fiveMBs", 'rwb');
         $logGroup->write($mem);
        // rewind($mem);
        
        // fclose($mem);
         //d://logGroup.pdoc
        // $mem = fopen("php://memory", "rb");
        // $mem = fopen("php://temp/maxmemory:$fiveMBs", 'r+');
         $bytes;
         while(!feof($mem))
             $bytes = fread($mem, 10*1024*1024);
         fclose($mem);
         //test
         if($bytes===false)echo "fread fail";
         return $bytes;*/
              
    }


    /**
     * Get url encode.
     *
     * @return string
     */
    public static function urlEncodeValue($value) {
        return urlencode ( $value );
    }
    
    /**
     * Get url encode.
     *
     * @return string
     */
    public static function urlEncode($params) {
        ksort ( $params );
        $url = "";
        $first = true;
        foreach ( $params as $key => $value ) {
            $val = Aliyun_Log_Util::urlEncodeValue ( $value );
            if ($first) {
                $first = false;
                $url = "$key=$val";
            } else
                $url .= "&$key=$val";
        }
        return $url;
    }
    
    /**
     * Get canonicalizedLOGHeaders string as defined.
     *
     * @return string
     */
    public static function canonicalizedLOGHeaders($header) {
        ksort ( $header );
        $content = '';
        $first = true;
        foreach ( $header as $key => $value )
            if (strpos ( $key, "x-log-" ) === 0 || strpos ( $key, "x-acs-" ) === 0) { // x-log- header
            if ($first) {
                $content .= $key . ':' . $value;
                $first = false;
            } else
                $content .= "\n" . $key . ':' . $value;
        }
        return $content;
    }
    
    /**
     * Get canonicalizedResource string as defined.
     *
     * @return string
     */
    public static function canonicalizedResource($resource, $params) {
        if ($params) {
            ksort ( $params );
            $urlString = "";
            $first = true;
            foreach ( $params as $key => $value ) {
                if ($first) {
                    $first = false;
                    $urlString = "$key=$value";
                } else
                    $urlString .= "&$key=$value";
            }
            return $resource . '?' . $urlString;
        }
        return $resource;
    }
    
    /**
     * Get request authorization string as defined.
     *
     * @return string
     */
    public static function getRequestAuthorization($method, $resource, $key,$stsToken, $params, $headers) {
        if (! $key)
            return '';
        $content = $method . "\n";
        if (isset ( $headers ['Content-MD5'] ))
            $content .= $headers ['Content-MD5'];
        $content .= "\n";
        if (isset ( $headers ['Content-Type'] ))
            $content .= $headers ['Content-Type'];
        $content .= "\n";
        $content .= $headers ['Date'] . "\n";
        $content .= Aliyun_Log_Util::canonicalizedLOGHeaders ( $headers ) . "\n";
        $content .= Aliyun_Log_Util::canonicalizedResource ( $resource, $params );
        return Aliyun_Log_Util::hmacSHA1 ( $content, $key );
    }

}