clips > get_aws_signed_url

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API: Reference

Description

Requesting a CloudFront signed URL from an unsigned media URL.

NOTE: The signature will be generated using the iformation provided in the WebTV configuration [+info].

Requirements

StreamClip extension.

Required Credential Permission

GET [Signed Requests Only]

Building the Request

Request URL and GET vars

GET vars specific to this request:

Var	Value	Description
go	clips	The API section
do	get_aws_signed_url	The API action
iq	*URL*	URL that requires the CloudFront signature (URL Encoded)

Resulting Request URL:
The resulting request URL would be similar to this (don't forget to append the required info: key, timestamp, salt and signature):
https://....../api.php?go=clips&do=get_aws_signed_url&iq={url}&{required information}

POST vars

The following POST var is required.

Var	Value	Description
id_clip	(int) *Clip ID*	The ID of the Clip the media is associated to

The following POST var is optional (but recommended).

Var	Value	Description
ip	(string) *IP Address*	The (public) IP of the User who will watch the media. If you do not provide it the system will use the detected IP (the IP of the application which may -or may not- match the IP of the User who will watch the media).

Response Examples

If the request was successful, you'll receive a response containing:
• original_url: The original URL.
• signed_url: The signed URL.
• used_ip: The IP used to generate the signature.
Example:

{
    "original_url": "http:\/\/...urltosign...",
    "signed_url": "http:\/\/...urltosign...?Expires=1427540397&Signature=Za4ayDEUE4ZP0R3kURi4JUYOToHkK-aqN3NGYmEqWjUgIT8e8qGRMwfeicQc~nJYauXgRi62KVeBDK1I35t~MUQCMUD09hJ9zoaIWInHn0kQrFleXQ7iw2PPQ1s16KU-2dcFEW21NwLz4k3xdRk03VOhDREYWpc~uZBitrGwBRtB7DWYIWME8RNDa3JsZA2GYA41XS48WUlDa37n1A7rk9sp-whqs-5LfwnicSrHkmYDWi75zsrORspvY7ISr1jioxa8ZvET73OienS2dX6X5B-w9VmSBO~3NTCg7lqW8WOT00gCtI2F2Y43G1QYiWbsRL5M~Ud993sTU6QnPjku9w__&Key-Pair-Id=APKAI5ZNIJUFLK5E36WQ&Policy=eyJTdGF0ZW1lbnQiOlt7IlJlc291cmNlIjoiaHR0cDovL3VybHRvc2lnbi4uLiIsIkNvbmRpdGlvbiI6eyJJcEFkZHJlc3MiOnsiQVdTOlNvdXJjZUlwIjoiNjIuMTE3LjIyNC44Ny8zMiJ9LCJEYXRlTGVzc1RoYW4iOnsiQVdTOkVwb2NoVGltZSI6MTQyNzU0MDM5N319fV19",
    "used_ip": "xxx.xxx.xxx.xxx"
}

If the request failed (for example, if no signature was provided in the request), you'll receive a response like the following:

{
	"error"		 : "REQUEST_ERROR",
	"error_long" : "Missing signature"
}

Possible Error Messages
Check the general errors.

PHP Example Code

Preparing GET and POST data.

// The GET vars
$GET_VARS = array( 
					"go"        => "clips",
					"do"        => "get_aws_signed_url",
					"iq"        => "http://...urltosign..."
					);

// The POST vars
$POST_VARS = array(
					"id_clip"	=> 13,
                    "ip"		=> "xxx.xxx.xxx"
                    );

Generating the salt, timestamp, signature and sending the request
*** The following code block is common to all signed requests ***

// Collect the API Base URL and Credential info
$API_URL = "https://www.mywebtvdomain.tv/api.php";
$API_KEY_ID = "1b323a1cb879fd4e66530fbad07a32ee"; 
$API_SHARED_SECRET = "MWIzMjNhMWNiODc5ZmQ0ZTY2NTMwZmJhZDA3YTMyZWViOTQ3MDJiOGM2ZTU2NjE3"; // keep this safe!!!

// Generating salt and timestamp
$salt = md5(mt_rand());
$timestamp = time();
$signature = base64_encode(hash_hmac('sha256', $salt.$timestamp, $API_SHARED_SECRET, true));

// Generating the validation signature
// - Default method: using base64_encode(hash_hmac(...))
$signature = base64_encode(hash_hmac('sha256', $salt.$timestamp, $API_SHARED_SECRET, true)); // comment this line if using the next method
// - Simplified method - available since v60: using md5(). 
//   This method requires the variable $API_SIGNATURE_GENERATION_MODE = 1; in the config/Config.inc.php file.
// $signature = md5($salt."-".$timestamp."-".$API_SHARED_SECRET); // you must "uncomment" this line when using the simplified method

// Append the timestamp, salt, key and signature to the GET vars
$GET_VARS["timestamp"] = $timestamp; 	// UTC timestamp
$GET_VARS["salt"] = $salt;
$GET_VARS["key"] = $API_KEY_ID ;      // The API Key ID: This is public and is used by the API to identify the application;
$GET_VARS["signature"] = $signature;

// Create the request URL. Please note that if you do not use PHP buit in function 
// to create the HTTP query then don't forget to URL encode the values
$REQUEST_URL = $API_URL."?".http_build_query($GET_VARS); 
// The previous will build an URL like .../api.php?go=api_subject&do=api_action&etc...

// Create a new cURL resource and set the appropriate options
$ch = curl_init(); 
curl_setopt($ch, CURLOPT_URL, $REQUEST_URL); 
curl_setopt($ch, CURLOPT_POST, true); 
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); 
curl_setopt($ch, CURLOPT_HEADER, false);
curl_setopt($ch, CURLOPT_POSTFIELDS, $POST_VARS);
// If your PHP host does not have a valid  SSL certificate, you will need to turn off SSL
// Certificate Verification. This is dangerous (!), and should only be done temporarily
// until a valid certificate has been installed
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false); // Turns off verification of the SSL certificate.
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); // Turns off verification of the SSL certificate.

// Sending the request to the API
$response = curl_exec($ch);

// Processing the response
if (!$response) { 
	echo 'API call failed'; 
} 
else
{
	print_r(json_decode($response,true)); 
}

clips > get_aws_signed_url | WS.WebTV API Reference | WebTV Solutions

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API: Reference

API: Reference