Metacat

<?php

// Partnership for Interdisciplinary Studies of Coastal Oceans

// http://www.piscoweb.org

//

// This program is free software; you can redistribute it and/or modify

// it under the terms of the GNU General Public License as published by

// the Free Software Foundation; either version 2 of the License, or

// (at your option) any later version.

//

// This program is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

// GNU General Public License for more details.

//

// You should have received a copy of the GNU General Public License

// along with this program; if not, write to the Free Software

// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA

// 02111-1307  USA

	var $metacatUrl;

	//A file that the server has r/w access to

	var $cookieJar = './cookiejar';

	//Status messages sent back from metacat, getMessages()

	var $messages;

	//Constructor is run when oject is instanciated

	function metacatClient( $url ) {

		$this->metacatUrl = $url;

	}//END Constructor

	function login( $username, $password ) {

		$post_data_array = array (

			'action'	=>	'login',

			'qformat'	=>	'xml',

			'username'	=>	$username,

			'password'	=>	$password

		);

		$response = $this->_request( $post_data_array );

		if(strpos($response, "<login>")) {

			return 1;

		}else{

			return 0;

		}

	}//END login

	function logout() {

		$post_data_array = array (

			'action'	=>	'logout',

			'qformat'	=>	'xml',

		);

		$response = $this->_request( $post_data_array );

		if(strpos($response, "<logout>")) {

			return 1;

		}else{

			return 0;

		}

	}//END logout

	function loginAndSetBrowserCookies($username, $password) {

		//There could be multiple people logging in, so more than one cookieJar referenced by username is needed.

		$this->cookieJar = '/tmp/metacatPHPClientCookies/'.$username;

		//Now that the cookieJar has a new path, we can use our standard methods

		$this->login($username, $password);

		//Set browser cookies from $this->cookieJar using fopen(...path..) or by parsing

		//$this->getMessages() for metacat's xml response

		//Delete that cookieJar to be safe

		//return true if login == true && rm cookieJar == true

	}

	function setCookieJarFromBrowser() {

		//Get session cookie from browser

		//Write it to $this->cookieJar

	}

	function read( $docid ) {

		$post_data_array = array (

			'action'	=>	'read',

			'qformat'	=>	'xml',

			'docid'		=>  $docid

		);

		$response = $this->_request( $post_data_array );

		if(strpos($response, "<error>")) {

			return 0;

		}else{

			return $response;

		}

	}//END read

	/**

	 *	Pass a docid without revision, or pisco_data.1.1

	 *	becomes pisco_data.1

	*/

	function getNewestDocId( $docidWithoutRevision ) {

		$pieces = explode(".", $docidWithoutRevision);

		if (count($pieces) > 2) {

			$this->_setMessages("You included the revision number. Changing $docidWithoutRevision to ".$pieces[0].".".$pieces[1]);

		}

		$docidWithoutRevision = $pieces[0].".".$pieces[1];

		$xml = $this->read($docidWithoutRevision);

		if(!$xml) {

			$this->_setMessages('No package with this docId found');

			return false;

		}

		$packageIdParser = new PackageIdParser();

		$xml_parser = xml_parser_create();

		xml_set_object($xml_parser,&$packageIdParser);

		xml_set_element_handler($xml_parser, "startElement", "endElement");

		xml_parse($xml_parser, $xml, true);

		xml_parser_free($xml_parser);

		if($packageId = $packageIdParser->packageId) {

			return $packageId;

		}else{

			$this->_setMessages('No packageId found.');

			return false;

		}

	}

	function squery( $pathquery_doc ) {

		$post_data_array = array (

			'action'	=>	'squery',

			'qformat'	=>	'xml',

			'query'		=>  $pathquery_doc

		);

		$response = $this->_request( $post_data_array );

		if($response) {

			return $response;

		}else{

			return 0;

		}

	}//END squery

	function insert( $docid, $doctext ) {

		$post_data_array = array (

			'action'	=>	'insert',

			'docid'		=>  $docid,

			'doctext'	=>	$doctext

		);

		$response = $this->_request( $post_data_array );

		if(strpos($response, "<success>")) {

			return 1;

		}else{

			return 0;

		}

	}//END insert

	function update( $docid, $doctext ) {

		$post_data_array = array (

			'action'	=>	'update',

			'docid'		=>  $docid,

			'doctext'	=>	$doctext

		);

		$response = $this->_request( $post_data_array );

		if(strpos($response, "<success>")) {

			return 1;

		}else{

			return 0;

		}

	}//END update

	function delete( $docid ) {

		$post_data_array = array (

			'action'	=>	'delete',

			'docid'		=>  $docid,

		);

		$response = $this->_request( $post_data_array );

		if(strpos($response, "<success>")) {

			return 1;

		}else{

			return 0;

		}

	}//END delete

	function getMessages() {

		return $this->messages;

	}//END getMessages

	function _setMessages( $response ) {

		$this->messages .= " \n ".$response;

	}//END _set_messages

	function _request( $post_data_array ) {

		$request = curl_init();

		curl_setopt($request, CURLOPT_URL, $this->metacatUrl);

		curl_setopt($request, CURLOPT_COOKIEFILE, $this->cookieJar);

		curl_setopt($request, CURLOPT_COOKIEJAR, $this->cookieJar);

		curl_setopt($request, CURLOPT_POST, true);

		curl_setopt($request, CURLOPT_RETURNTRANSFER, true);

		curl_setopt($request, CURLOPT_USERAGENT, 'PHP metacat client (version 1.0)');

		$post_data = $this->_encode_post_data($post_data_array);

		curl_setopt ($request, CURLOPT_POSTFIELDS, $post_data);

		$response = curl_exec($request);

		$this->_setMessages($response);

		return $response;

	}//END _request

	function _encode_post_data( $post_data_array ) {

		foreach($post_data_array as $arg => $value) {

			$post_data_array[$arg] = $arg."=".urlencode($value);

		}

		$post_data = implode('&', $post_data_array);

		return $post_data;

	}//END _encode_post_data

}

class PackageIdParser {

	var $packageId;

	function startElement($parser, $name, $attrs) {

		if($name == "EML:EML") {

			$this->packageId = $attrs['PACKAGEID'];

		}

	}

	function endElement($parser, $name) {

	}

}