Amazon s3 example
Here i give you a sample code , in php, for amazon s3 file upload. Read the code carefully and try to implement.
Best wishes.
// grab this with “pear install Crypt_HMAC”
require_once ‘HMAC.php’;
// grab this with “pear install –onlyreqdeps HTTP_Request”
require_once ‘Request.php’;
// Note that version HTTP_Request 1.3.0 has a BUG in it! Change line
// 765 from:
// (HTTP_REQUEST_METHOD_POST != $this->_method && empty($this->_postData) && empty($this->_postFiles))) {
// to:
// (HTTP_REQUEST_METHOD_POST == $this->_method && empty($this->_postData) && empty($this->_postFiles))) {
// Without this change PUTs with non-empty content-type will fail!
//Click Read more to continue
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class s3{
var $serviceUrl;
var $accessKeyId;
var $secretKey;
var $responseString;
var $responseCode;
var $parsed_xml;
/**
* Constructor
*
* Takes ($accessKeyId, $secretKey, $serviceUrl)
*
* - [str] $accessKeyId: Your AWS Access Key Id
* - [str] $secretKey: Your AWS Secret Access Key
* - [str] $serviceUrl: OPTIONAL: defaults: http://s3.amazonaws.com/
*
*/
function __construct($accessKeyId, $secretKey, $serviceUrl="http://s3.amazonaws.com/") {
$this->serviceUrl=$serviceUrl;
$this->accessKeyId=$accessKeyId;
$this->secretKey=$secretKey;
}
/**
* createBucket -- creates a bucket.
*
* Takes ($bucket, $acl)
*
* - [str] $bucket: the bucket you wish to create
* - [str] $acl: the access control policy (OPTIONAL: defaults to 'private')
*/
function createBucket($bucket, $acl = 'private') {
$httpDate = gmdate("D, d M Y G:i:s T");
$stringToSign = "PUT\n\n\n$httpDate\nx-amz-acl:$acl\n/$bucket";
$signature = $this->constructSig($stringToSign);
$req =& new HTTP_Request($this->serviceUrl . $bucket);
$req->setMethod("PUT");
$req->addHeader("Date", $httpDate);
$req->addHeader("Authorization", "AWS " . $this->accessKeyId . ":" . $signature);
$req->addHeader("x-amz-acl", $acl);
$req->sendRequest();
$this->responseCode=$req->getResponseCode();
$this->responseString = $req->getResponseBody();
$this->parsed_xml = simplexml_load_string($this->responseString);
if ($this->responseCode == 200) {
return true;
} else {
return false;
}
}
/**
* deleteBucket -- Deletes an empty bucket.
*
* Takes ($bucket)
*
* - [str] $bucket: the bucket you wish to delete
*/
function deleteBucket($bucket) {
$httpDate = gmdate("D, d M Y G:i:s T");
$stringToSign = "DELETE\n\n\n$httpDate\n/$bucket";
$signature = $this->constructSig($stringToSign);
$req =& new HTTP_Request($this->serviceUrl . $bucket);
$req->setMethod("DELETE");
$req->addHeader("Date", $httpDate);
$req->addHeader("Authorization", "AWS " . $this->accessKeyId . ":" . $signature);
$req->sendRequest();
$this->responseCode = $req->getResponseCode();
$this->responseString = $req->getResponseBody();
$this->parsed_xml = simplexml_load_string($this->responseString);
if ($this->responseCode == 204) {
return true;
} else {
return false;
}
}
/**
* emptyBucket -- Deletes all keys in specified bucket.
*
* Takes ($bucket)
*
* - [str] $bucket: the bucket you wish to empty
*/
function emptyBucket($bucket) {
if($this->listKeys($bucket)){//get keys from S3 bucket
$more = $this->parsed_xml->IsTruncated; //determine of all keys in bucket are returned on this list call
$keys = $this->parsed_xml->Contents;
//set up array for catching keys that aren't successfully deleted and set the initial count of these to 0
$not_deleted_keys = array();
$not_deleted_count = 0;
foreach($keys as $current){//try up to 3 times to delete current key
$tries=1;
while(!$this->deleteObject($bucket, $current->Key) && $tries<=3){
$tries++;
}
if($tries>3){//capture any keys that aren't deleted
$not_deleted_keys[$not_deleted_count] = $current->Key;
$not_deleted_count++;
}
}
} else {
echo "listKeys() failed";
return false;
}
if($not_deleted_count > 0){
echo "Warning - The following keys were not deleted:
";
foreach($not_deleted_keys as $key){
echo $key."
";
}
}
if($more == "true") //call emptyBucket if not all keys were returned with last list call
$this->emptyBucket($bucket);
return true;
}
/**
* listBuckets -- Lists all buckets.
*/
function listBuckets() {
$httpDate = gmdate("D, d M Y G:i:s T");
$stringToSign="GET\n\n\n$httpDate\n/";
$signature = $this->constructSig($stringToSign);
$req =& new HTTP_Request($this->serviceUrl);
$req->addHeader("Date", $httpDate);
$req->addHeader("Authorization", "AWS " . $this->accessKeyId . ":" . $signature);
$req->sendRequest();
$this->responseCode = $req->getResponseCode();
$this->responseString = $req->getResponseBody();
$this->parsed_xml = simplexml_load_string($this->responseString);
if($this->responseCode == 200){
return true;
}
else{
return false;
}
}
/**
* listKeys -- Lists keys in a bucket.
*
* Takes ($bucket [,$marker][,$prefix][,$delimiter][,$maxKeys]) -- $marker, $prefix, $delimeter, $maxKeys are independently optional
*
* - [str] $bucket: the bucket whose keys are to be listed
* - [str] $marker: keys returned will occur lexicographically after $marker (OPTIONAL: defaults to false)
* - [str] $prefix: keys returned will start with $prefix (OPTIONAL: defaults to false)
* - [str] $delimiter: keys returned will be of the form "$prefix[some string]$delimeter" (OPTIONAL: defaults to false)
* - [str] $maxKeys: number of keys to be returned (OPTIONAL: defaults to 1000 - maximum allowed by service)
*/
function listKeys($bucket, $marker=FALSE, $prefix=FALSE, $delimiter=FALSE, $maxKeys='1000') {
$httpDate = gmdate("D, d M Y G:i:s T");
$stringToSign = "GET\n\n\n$httpDate\n/$bucket";
$signature = $this->constructSig($stringToSign);
$req =& new HTTP_Request($this->serviceUrl.$bucket."?max-keys={$maxKeys}&marker={$marker}&prefix={$prefix}&delimiter={$delimiter}");
$req->addHeader("Date", $httpDate);
$req->addHeader("Authorization", "AWS " . $this->accessKeyId . ":" . $signature);
$req->sendRequest();
$this->responseCode = $req->getResponseCode();
$this->responseString = $req->getResponseBody();
$this->parsed_xml = simplexml_load_string($this->responseString);
if($this->responseCode == 200){
return true;
} else {
return false;
}
}
/**
* getBucketACL -- Gets bucket access control policy.
*
* Takes ($bucket)
*
* - [str] $bucket: the bucket whose acl you want
*/
function getBucketACL($bucket){
$httpDate = gmdate("D, d M Y G:i:s T");
$stringToSign = "GET\n\n\n$httpDate\n/$bucket/?acl";
$signature = $this->constructSig($stringToSign);
$req =& new HTTP_Request($this->serviceUrl.$bucket.'/?acl');
$req->setMethod("GET");
$req->addHeader("Date", $httpDate);
$req->addHeader("Authorization", "AWS " . $this->accessKeyId . ":" . $signature);
$req->sendRequest();
$this->responseCode = $req->getResponseCode();
$this->responseString = $req->getResponseBody();
$this->parsed_xml = simplexml_load_string($this->responseString);
if ($this->responseCode == 200) {
return true;
} else {
return false;
}
}
/**
* setBucketACL -- Sets bucket access control policy to one of Amazon S3 canned policies.
*
* Takes ($bucket, $acl)
*
* - [str] $bucket: the bucket whose acl is to be set
* - [str] $acl: one of the Amazon S3 canned access policies
*/
function setBucketACL($bucket, $acl){
$httpDate = gmdate("D, d M Y G:i:s T");
$stringToSign = "PUT\n\n\n{$httpDate}\nx-amz-acl:$acl\n/$bucket/?acl";
$signature = $this->constructSig($stringToSign);
$req =& new HTTP_Request($this->serviceUrl.$bucket.'/?acl');
$req->setMethod("PUT");
$req->addHeader("Date", $httpDate);
$req->addHeader("Authorization", "AWS " . $this->accessKeyId . ":" . $signature);
$req->addHeader("x-amz-acl", $acl);
$req->sendRequest();
$this->responseCode=$req->getResponseCode();
$this->responseString=$req->getResponseBody();
$this->parsed_xml=simplexml_load_string($this->responseString);
if ($this->responseCode == 200) {
return true;
} else {
return false;
}
}
/**
* grantLoggingPermission -- allows logs to be written to the bucket.
*
* Takes ($bucket)
*
* - [str] $bucket
*/
function grantLoggingPermission($bucket){
$httpDate = gmdate("D, d M Y G:i:s T");
$stringToSign = "PUT\n\ntext/plain\n{$httpDate}\n/$bucket/?acl";
$signature = $this->constructSig($stringToSign);
$req =& new HTTP_Request($this->serviceUrl.$bucket.'/?acl');
$req->setMethod("PUT");
//The body below is meant in part as an example of how to grant specific groups certain permissions. In practice, use the getBucketACL method to obtain
//the owner Id and display name. The and elements will have to be filled in accordingly here. These can be obtained by using the Get
//Object ACL or Get Bucket ACL method on an existing object or bucket respectively.Note that this was written with See the the idea that a new bucket
//first be created with the sole purpose of housing logs. As is, this method will overwrite the ACP for an existing bucket. See the Developer Guide for
//more details on granting permissions.
$body = "
FULL_CONTROL
http://acs.amazonaws.com/groups/s3/LogDelivery
WRITE
http://acs.amazonaws.com/groups/s3/LogDelivery
READ_ACP
";
$req->setBody($body);
$req->addHeader("Date", $httpDate);
$req->addHeader("Content-Type", "text/plain");
$req->addHeader("Authorization", "AWS " . $this->accessKeyId . ":" . $signature);
$req->sendRequest();
$this->responseCode=$req->getResponseCode();
$this->responseString=$req->getResponseBody();
$this->parsed_xml=simplexml_load_string($this->responseString);
if ($this->responseCode == 200) {
return true;
} else {
return false;
}
}
/**
* getLoggingStatus -- gets a bucket's logging status (is logging enabled?).
*
* Takes ($bucket)
*
* - [str] $bucket
*/
function getLoggingStatus($bucket){
$httpDate = gmdate("D, d M Y G:i:s T");
$stringToSign = "GET\n\n\n$httpDate\n/$bucket?logging";
$signature = $this->constructSig($stringToSign);
$req =& new HTTP_Request($this->serviceUrl.$bucket.'?logging');
$req->setMethod("GET");
$req->addHeader("Date", $httpDate);
$req->addHeader("Authorization", "AWS " . $this->accessKeyId . ":" . $signature);
$req->sendRequest();
$this->responseCode = $req->getResponseCode();
$this->responseString = $req->getResponseBody();
$this->parsed_xml = simplexml_load_string($this->responseString);
if ($this->responseCode == 200) {
return true;
} else {
return false;
}
}
/**
* enableLogging -- Turns logging feature on/off for a given bucket.
*
* Takes ($bucket, $targetBucket, $targetPrefix, $switch)
*
* - [str] $bucket: Bucket for which logging is to be turned on.
* - [str] $targetBucket: Bucket to which logs will be sent.
* - [str] $targetPrefix: Prefix for key of each log entry.
* - [bool] $switch: True to turn logging on, False to turn it off.
*/
function enableLogging($bucket, $targetBucket, $targetPrefix, $switch) {
$httpDate = gmdate("D, d M Y G:i:s T");
$stringToSign = "PUT\n\ntext/xml\n{$httpDate}\n/$bucket?logging";
$signature = $this->constructSig($stringToSign);
$req = & new HTTP_Request($this->serviceUrl.$bucket.'?logging');
$req->setMethod("PUT");
$req->addHeader("Date", $httpDate);
$req->addHeader("Content-Type", "text/xml");
$req->addHeader("Authorization", "AWS " . $this->accessKeyId . ":" . $signature);
if($switch){
$body = "
$targetBucket
$targetPrefix
";
} else {
$body = "
";
}
$req->setBody($body);
$req->sendRequest();
$this->responseCode = $req->getResponseCode();
$this->responseString = $req->getResponseBody();
if ($this->responseCode == 200) {
return true;
} else {
return false;
}
}
/**
* putObject -- Writes a file to a bucket.
*
* Takes ($bucket, $key, $filePath, $contentType, $contentLength [,$acl][, $metadataArray], [$md5])
*
* - [str] $bucket: the bucket into which file will be written
* - [str] $key: key of written file
* - [str] $contentType: file content type
* - [str] $contentLength: file content length
* - [str] $acl: access control policy of file (OPTIONAL: defaults to 'private')
* - [array] $metadataArray: associative array containing user-defined metadata (name=>value) (OPTIONAL)
* - [bool] $md5: includes the MD5 hash of the object if true (OPTIONAL)
*/
function putObject($bucket, $key, $filePath, $contentType, $contentLength, $acl, $metadataArray, $md5){
sort($metadataArray);
$resource = $bucket."/".urlencode($key);
$req = & new HTTP_Request($this->serviceUrl.$resource);
$req->setMethod("PUT");
$httpDate = gmdate("D, d M Y G:i:s T");
$req->addHeader("Date", $httpDate);
$req->addHeader("Content-Type", $contentType);
$req->addHeader("Content-Length", $contentLength);
$req->addHeader("x-amz-acl", $acl);
if($md5){
$MD5 = $this->hex2b64(md5_file($filePath));
$req->addHeader("Content-MD5", $MD5);
}
$req->setBody(file_get_contents($filePath));
$stringToSign="PUT\n$MD5\n$contentType\n$httpDate\nx-amz-acl:$acl\n";
foreach($metadataArray as $current){
if($current!=""){
$stringToSign.="x-amz-meta-$current\n";
$header = substr($current,0,strpos($current,':'));
$meta = substr($current,strpos($current,':')+1,strlen($current));
$req->addHeader("x-amz-meta-$header", $meta);
}
}
$stringToSign.="/$resource";
$signature = $this->constructSig($stringToSign);
$req->addHeader("Authorization", "AWS " . $this->accessKeyId . ":" . $signature);
$req->sendRequest();
$this->responseCode = $req->getResponseCode();
$this->responseString = $req->getResponseBody();
$this->parsed_xml = simplexml_load_string($this->responseString);
if ($this->responseCode == 200) {
return true;
} else {
return false;
}
}
/**
* putObjectStream -- Streams data to a bucket. (Note: this method was written by Carson McDonald and can be found on the Mission Data Blog)
* Mission Data Blog: http://blogs.missiondata.com/linux/49/s3-streaming-with-php/
*
* Takes ($bucket, $key, $streamFunction, $contentType, $contentLength, $filePath [,$acl][,$metadataArray])
*
*
* - [str] $bucket: the bucket into which file will be written
* - [str] $key: key of written file
* - [str] $streamFunction: function to call for data to stream
* - [str] $contentType: file content type
* - [str] $contentLength: file content length
* - [str] $filePath: path of file to be PUT
* - [str] $acl: access control policy of file (OPTIONAL: defaults to 'private')
* - [str] $metadataArray: associative array containing user-defined metadata (name=>value) (OPTIONAL)
*/
function putObjectStream($bucket, $key, $contentType, $contentLength, $filePath, $acl, $metadataArray){
$stream_inst = new Stream();
$stream_inst->data = fopen($filePath, "r");
$streamFunction = array($stream_inst, "stream_function");
sort($metadataArray);
$resource = "$bucket/$key";
$resource = urlencode($resource);
$httpDate = gmdate("D, d M Y G:i:s T");
$curl_inst = curl_init();
curl_setopt ($curl_inst, CURLOPT_CONNECTTIMEOUT, 30);
curl_setopt ($curl_inst, CURLOPT_LOW_SPEED_LIMIT, 1);
curl_setopt ($curl_inst, CURLOPT_LOW_SPEED_TIME, 180);
curl_setopt ($curl_inst, CURLOPT_NOSIGNAL, 1);
curl_setopt ($curl_inst, CURLOPT_READFUNCTION, $streamFunction);
curl_setopt ($curl_inst, CURLOPT_URL, $this->serviceUrl . $resource);
curl_setopt ($curl_inst, CURLOPT_UPLOAD, true);
curl_setopt ($curl_inst, CURLINFO_CONTENT_LENGTH_UPLOAD, $contentLength);
$header[] = "Date: $httpDate";
$header[] = "Content-Type: $contentType";
$header[] = "Content-Length: $contentLength";
$header[] = "Expect: ";
$header[] = "Transfer-Encoding: ";
$header[] = "x-amz-acl: $acl";
$stringToSign="PUT\n$MD5\n$contentType\n$httpDate\nx-amz-acl:$acl\n";
foreach($metadataArray as $current){
if($current!=""){
$stringToSign.="x-amz-meta-$current\n";
$header = substr($current,0,strpos($current,':'));
$meta = substr($current,strpos($current,':')+1,strlen($current));
$header[] = "x-amz-meta-$header: $meta";
}
}
$stringToSign.="/$resource";
$signature = $this->constructSig($stringToSign);
$header[] = "Authorization: AWS $this->accessKeyId:$signature";
curl_setopt($curl_inst, CURLOPT_HTTPHEADER, $header);
curl_setopt($curl_inst, CURLOPT_RETURNTRANSFER, 1);
$result = curl_exec ($curl_inst);
$this->responseString = $result;
$this->responseCode = curl_getinfo($curl_inst, CURLINFO_HTTP_CODE);
fclose($stream_inst->data);
curl_close($curl_inst);
if ($this->responseCode == 200) {
return true;
} else {
return false;
}
}
/**
* deleteObject -- Deletes an object.
*
* Takes ($bucket, $key)
*
* - [str] $bucket: the bucket from which file will be deleted
* - [str] $key: key of file to be deleted
*/
function deleteObject($bucket, $key) {
$httpDate = gmdate("D, d M Y G:i:s T");
$resource = $bucket."/".urlencode($key);
$stringToSign = "DELETE\n\n\n$httpDate\n/$resource";
$signature = $this->constructSig($stringToSign);
$req =& new HTTP_Request($this->serviceUrl.$resource);
$req->setMethod("DELETE");
$req->addHeader("Date", $httpDate);
$req->addHeader("Authorization", "AWS " . $this->accessKeyId . ":" . $signature);
$req->sendRequest();
$this->responseCode = $req->getResponseCode();
$this->responseString = $req->getResponseBody();
$this->parsed_xml = simplexml_load_string($this->responseString);
if ($this->responseCode == 204) {
return true;
} else {
return false;
}
}
/**
* getObjectACL -- gets an objects access control policy.
*
* Takes ($bucket, $key)
*
* - [str] $bucket
* - [str] $key
*/
function getObjectACL($bucket, $key){
$httpDate = gmdate("D, d M Y G:i:s T");
$resource = $bucket."/".urlencode($key);
$stringToSign = "GET\n\n\n$httpDate\n/$resource?acl";
$signature = $this->constructSig($stringToSign);
$req =& new HTTP_Request($this->serviceUrl.$resource.'?acl');
$req->setMethod("GET");
$req->addHeader("Date", $httpDate);
$req->addHeader("Authorization", "AWS " . $this->accessKeyId . ":" . $signature);
$req->sendRequest();
$this->responseCode = $req->getResponseCode();
$this->responseString = $req->getResponseBody();
$this->parsed_xml = simplexml_load_string($this->responseString);
if ($this->responseCode == 200) {
return true;
} else {
return false;
}
}
/**
* setObjectACL -- sets objects access control policy to one of Amazon S3 canned policies.
*
* Takes ($bucket, $key, $acl)
*
* - [str] $bucket
* - [str] $key
* - [str] $acl -- One of canned access control policies.
*/
function setObjectACL($bucket, $key, $acl){
$httpDate = gmdate("D, d M Y G:i:s T");
$resource = $bucket."/".urlencode($key);
$stringToSign = "PUT\n\n\n$httpDate\nx-amz-acl:$acl\n/$resource?acl";
$signature = $this->constructSig($stringToSign);
$req =& new HTTP_Request($this->serviceUrl.$resource.'?acl');
$req->setMethod("PUT");
$req->addHeader("Date", $httpDate);
$req->addHeader("Authorization", "AWS " . $this->accessKeyId . ":" . $signature);
$req->addHeader("x-amz-acl", $acl);
$req->sendRequest();
$this->responseCode = $req->getResponseCode();
$this->responseString = $req->getResponseBody();
$this->parsed_xml = simplexml_load_string($this->responseString);
if ($this->responseCode == 200) {
return true;
} else {
return false;
}
}
/**
* getMetadata -- Gets the metadata associated with an object.
*
* Takes ($bucket, $key)
*
* - [str] $bucket
* - [str] $key
*/
function getMetadata($bucket, $key){
$httpDate = gmdate("D, d M Y G:i:s T");
$resource = $bucket."/".urlencode($key);
$stringToSign = "HEAD\n\n\n$httpDate\n/$resource";
$signature = $this->constructSig($stringToSign);
$req =& new HTTP_Request($this->serviceUrl.$resource);
$req->setMethod("HEAD");
$req->addHeader("Date", $httpDate);
$req->addHeader("Authorization", "AWS " . $this->accessKeyId . ":" . $signature);
$req->sendRequest();
$this->responseCode = $req->getResponseCode();
$this->headers = $req->getResponseHeader();
if ($this->responseCode == 200) {
return true;
} else {
return false;
}
}
/**
* getObjectAsString -- Returns object as a string.
*
* Takes ($bucket, $key)
*
* - [str] $bucket
* - [str] $key
*/
function getObjectAsString($bucket, $key) {
$httpDate = gmdate("D, d M Y G:i:s T");
$resource = $bucket."/".urlencode($key);
$stringToSign = "GET\n\n\n{$httpDate}\n/$resource";
$signature = $this->constructSig($stringToSign);
$req = & new HTTP_Request($this->serviceUrl.$resource);
$req->setMethod("GET");
$req->addHeader("Date", $httpDate);
$req->addHeader("Authorization", "AWS " . $this->accessKeyId . ":" . $signature);
$req->sendRequest();
$this->responseCode = $req->getResponseCode();
$this->responseString = $req->getResponseBody();
if ($this->responseCode == 200) {
return true;
} else {
$this->parsed_xml = simplexml_load_string($this->responseString);
return false;
}
}
/**
* queryStringGet -- returns a signed URL to get object
*
* Takes ($bucket, $key, $expires)
*
* - [str] $bucket
* - [str] $key
* - [str] $expires - signed URL with expire after $expires seconds
*/
function queryStringGet($bucket, $key, $expires){
$expires = time() + $expires;
$resource = $bucket."/".urlencode($key);
$stringToSign = "GET\n\n\n$expires\n/$resource";
$signature = urlencode($this->constructSig($stringToSign));
$queryString = "";
return $queryString;
}
function hex2b64($str) {
$raw = '';
for ($i=0; $i < strlen($str); $i+=2) {
$raw .= chr(hexdec(substr($str, $i, 2)));
}
return base64_encode($raw);
}
function constructSig($str) {
$hasher =& new Crypt_HMAC($this->secretKey, "sha1");
$signature = $this->hex2b64($hasher->hash($str));
return($signature);
}
}
class Stream{
var $data;
function stream_function($handle, $fd, $length){
return fread($this->data, $length);
}
} |
Get full code from http://www.sajithmr.com/downloads/s3-test-utility-php.rar
Get full code from http://www.sajithmr.com/downloads/s3-test-utility-php.rar
Hi Sajith , First of all thanks for posting such a good example code . I was searching for a code for S3 storage . Above is very useful to me. Also let me know how can we view the stored images in web page. I tried with but it seems to be not working . Please help me.
Thanks in advance ….
Sandeep,
you can view and manage your amazon s3 account using mozilla’s plugin.
http://www.rjonna.com/ext/s3fox.php
Check and revert me
I tried to install S3 organizer extension to mozilla. But it throws an error which says ‘ difference between request time and current time is too large’. The file upload using putObject method works fine and returns response code 200. I tried with below code
\’
The time difference i think is due to your system time error. Might be your cmos battery is not working or some virus may change your system time.
Thanks and Regards
Sajith.M.R
Thanks for the help, it was very useful for me and its most clear.
When i am trying to put an object into the bucket, your code is saying object is created at the specified location, but when i list then object is not listing.
Could you tell me the reason beyond this. Please….
Hi Sajith,
How do we check the image exist in the amazon s3 server?
Please suggest me to do this.
Save your favourite movie from any tube site using your Flvtube Player :http://smal.ly/flvtubes
Hey Sajith, this was very helpful thanks! Btw, if you are on PHP 5+ you don’t need to use PEAR to get your HMAC on, just use hash_hmac to generate your signature:
$sig = hash_hmac( "sha1", $stringToSign, $secretKey);
Thanks for your post.
link to download the rar file is not working anymore.
http://www.sajithmr.com/downloads/s3-test-utility-php.rar