Uploading files to Amazon S3 with REST API in PHP

You can upload files with socket based REST API in PHP. In order to access Amazon S3 API, you need Access Key and Secret Key. Following is the example. 
 

<?php 
$aws_key = '_YOUR_AWS_KEY_000000'; 
$aws_secret = '_your_aws_secret_00000000000000000000000';$source_file = 'logo.gif'; // file to upload to S3 

$file_type = "image/gif";  // or other file type like "image/jpeg" for JPEG image, 
// or "binary/octet-stream" for binary file 

$aws_bucket = 'anyexample-test'; // AWS bucket 
$aws_object = 'logo.gif';         // AWS object name (file name) 

if (strlen($aws_secret) != 40) die("$aws_secret should be exactly 40 bytes long"); 
$file_data = file_get_contents($source_file); 
if ($file_data == false) die("Failed to read file ".$source_file); 

// opening HTTP connection to Amazon S3 
$fp = fsockopen("s3.amazonaws.com", 80, $errno, $errstr, 30); 
if (!$fp) { 
die("$errstr ($errno) "); 
} 

// Creating or updating bucket 

$dt = gmdate('r'); // GMT based timestamp// preparing String to Sign    (see AWS S3 Developer Guide) 

$string2sign = "PUT{$dt} 
/{$aws_bucket}" 

; 

// preparing HTTP PUT query 
$query = "PUT /{$aws_bucket} HTTP/1.1 
Host: s3.amazonaws.com 
Connection: keep-alive 
Date: $dt 
Authorization: AWS {$aws_key}:".amazon_hmac($string2sign)." "; 

$resp = sendREST($fp, $query); 
if (strpos($resp, '<Error>') !== false) 
die($resp);echo 

"BUCKET created "; 
// done// Uploading object 

$file_length = strlen($file_data); // for Content-Length HTTP field 

$dt = gmdate('r'); // GMT based timestamp 
// preparing String to Sign    (see AWS S3 Developer Guide) 
$string2sign = "PUT{$file_type} 
{$dt} 
x-amz-acl:public-read 
/{$aws_bucket}/{$aws_object}" 

; 

// preparing HTTP PUT query 
$query = "PUT /{$aws_bucket}/{$aws_object} HTTP/1.1 
Host: s3.amazonaws.com 
x-amz-acl: public-read 
Connection: keep-alive 
Content-Type: {$file_type} 
Content-Length: {$file_length} 
Date: $dt 
Authorization: AWS {$aws_key}:".amazon_hmac($string2sign)." "; 
$query .= $file_data; 

$resp = sendREST($fp, $query); 
if (strpos($resp, '<Error>') !== false) 
die($resp);echo 

"FILE uploaded "; 
// done 

echo "Your file's URL is:  http://s3.amazonaws.com/{$aws_bucket}/{$aws_object} "; 

fclose($fp); 

// Sending HTTP query and receiving, with trivial keep-alive support 
function sendREST($fp, $q, $debug = false) 
{ 
if ($debug) echo " QUERY<<{$q}>> "; 

fwrite($fp, $q); 
$r = ''; 
$check_header = true; 
while (!feof($fp)) { 
$tr = fgets($fp, 256); 
if ($debug) echo " RESPONSE<<{$tr}>>"; 
$r .= $tr;if (( 

$check_header)&&(strpos($r, " ") !== false)) 
{ 
// if content-length == 0, return query result 
if (strpos($r, 'Content-Length: 0') !== false) 
return $r; 
} 

// Keep-alive responses does not return EOF 
// they end with 0 string 
if (substr($r, -7) == " 0 ") 
return $r; 
} 
return $r; 
} 

// hmac-sha1 code START 
// hmac-sha1 function:  assuming key is global $aws_secret 40 bytes long 
// read more at http://en.wikipedia.org/wiki/HMAC 
// warning: key($aws_secret) is padded to 64 bytes with 0x0 after first function call 
function amazon_hmac($stringToSign) 
{ 
// helper function binsha1 for amazon_hmac (returns binary value of sha1 hash) 
if (!function_exists('binsha1')) 
{ 
if (version_compare(phpversion(), "5.0.0", ">=")) { 
function binsha1($d) { return sha1($d, true); } 
} else { 
function binsha1($d) { return pack('H*', sha1($d)); } 
} 
}global 

$aws_secret;if ( 

strlen($aws_secret) == 40) 
$aws_secret = $aws_secret.str_repeat(chr(0), 24); 

$ipad = str_repeat(chr(0x36), 64); 
$opad = str_repeat(chr(0x5c), 64); 

$hmac = binsha1(($aws_secret^$opad).binsha1(($aws_secret^$ipad).$stringToSign)); 
return base64_encode($hmac); 
} 
// hmac-sha1 code END