[edit] Last updated: Fri, 25 May 2012

OAuth::fetch

(PECL OAuth >= 0.99.1)

OAuth::fetch — Fetch an OAuth protected resource

Description

public mixed OAuth::fetch ( string $protected_resource_url [, array $extra_parameters [, string $http_method [, array $http_headers ]]] )

Fetch a resource.

Parameters

protected_resource_url

URL to the OAuth protected resource.

extra_parameters

Extra parameters to send with the request for the resource.

http_method

One of the OAUTH_HTTP_METHOD_* OAUTH constants, which includes GET, POST, PUT, HEAD, or DELETE.

HEAD (OAUTH_HTTP_METHOD_HEAD) can be useful for discovering information prior to the request (if OAuth credentials are in the Authorization header).

http_headers

HTTP client headers (such as User-Agent, Accept, etc.)

Return Values

Returns TRUE on success or FALSE on failure.

Changelog

Version	Description
1.0.0	Previously returned `NULL` on failure, instead of `FALSE`.
0.99.5	The `http_method` parameter was added
0.99.8	The `http_headers` parameter was added

Examples

Example #1 OAuth::fetch() example


<?php
try {
    $oauth = new OAuth("consumer_key","consumer_secret",OAUTH_SIG_METHOD_HMACSHA1,OAUTH_AUTH_TYPE_AUTHORIZATION);
    $oauth->setToken("access_token","access_token_secret");

    $oauth->fetch("http://photos.example.net/photo?file=vacation.jpg");

    $response_info = $oauth->getLastResponseInfo();
    header("Content-Type: {$response_info["content_type"]}");
    echo $oauth->getLastResponse();
} catch(OAuthException $E) {
    echo "Exception caught!\n";
    echo "Response: ". $E->lastResponse . "\n";
}
?>


Make sure that your $extra_parameters is an array.



If it's not, then OAuth will silently skip the malformed data type and produce a signature base string that is invalid (doesn't contain POST parameters, as defined in the RFC).



You should file a critical bug report against any REST API you find in the wild that accepts such a bogus signature to pass authentication.

contact info at mech dot cx 24-Mar-2011 01:00


I was having troubles getting fetch() to post, the remote server (Twitter, in this case) complained at me that their "resource only supports POST". Turned out to be a known bug in OAuth 1.1, downgrading to 1.0 fixed it.



Don't lose as much time over this as I did :-)

Lyuben Penkovski (l_penkovski at yahoo dot com) 27-Aug-2010 08:51


If the provider's web server is configured to use Keep-Alive extension to HTTP protocol (HTTP 1.1), there can be a big delay in the response time from the provider. By default Apache is configured to use Keep-Alive for 5 seconds. This is the delay after which the response will come back to the consumer. If you have this issue of delayed result, you can pass in HTTP headers when calling $consumer->fetch():



<?php

$consumer = new OAuth("consumer_key", "consumer_secret", OAUTH_SIG_METHOD_HMACSHA1, OAUTH_AUTH_TYPE_FORM);

$consumer->fetch('http://example.com/api/', null, OAUTH_HTTP_METHOD_POST, array('Connection'=>'close'));

?>



Then the provider will send the result immediately after it's ready with the processing and the connection will be closed. Unfortunately, when calling $consumer->getRequestToken() and $consumer->getAccessToken() there's no way provided to pass in HTTP headers and this delay (if present) cannot be avoided, or at least we could not find a way to avoid it.



The solution that worked for us is to send this header from the provider when returning result to the consumer:



<?php

$result = 'oauth_callback_accepted=true&oauth_token=' . $this->urlencode($token->oauth_token) .

          '&oauth_token_secret='.$this->urlencode($token->oauth_token_secret);



header('HTTP/1.1 200 OK');

header('Content-Length: '.strlen($result));

header('Content-Type: application/x-www-form-urlencoded');

header('Connection:close');

echo $result;

?>



This can work if you have the possibility to modify the code of the provider, e.g. if you are the provider yourself or if you can talk with the people that develop it and ask them to send this header for your request.

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