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Server: Apache/2.4.41 (Amazon) OpenSSL/1.0.2k-fips PHP/5.6.40
System: Linux ip-172-31-40-18 4.14.146-93.123.amzn1.x86_64 #1 SMP Tue Sep 24 00:45:23 UTC 2019 x86_64
User: apache (48)
PHP: 5.6.40
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File: //usr/share/pear/doc/oauth/examples/fireeagle/request_token.php
<?php
require("config.inc.php");
try {
	$o = new OAuth(OAUTH_CONSUMER_KEY,OAUTH_CONSUMER_SECRET,OAUTH_SIG_METHOD_HMACSHA1,OAUTH_AUTH_TYPE_URI);

	$arrayResp = $o->getRequestToken("https://fireeagle.yahooapis.com/oauth/request_token");

	file_put_contents(OAUTH_TMP_DIR . "/request_token_resp",serialize($arrayResp));
	$authorizeUrl = "https://fireeagle.yahoo.net/oauth/authorize?oauth_token={$arrayResp["oauth_token"]}";
	if(PHP_SAPI=="cli") {
		echo "Navigate your http client to: {$authorizeUrl}\n";
	} else {
		/* note: on the redirect there is no need to pass anything other than the oauth_token parameter */
		header("Location: {$authorizeUrl}");
	}
} catch(OAuthException $E) {
	echo "Response: ". $E->lastResponse . "\n";
}