[openemr.git] / library / classes / Document.class.php

<?php

require_once(dirname(__FILE__) . "/ORDataObject.class.php");
require_once(dirname(__FILE__) . "/CouchDB.class.php");

/**
 * class Document
 * This class is the logical representation of a physical file on some system somewhere that can be referenced with a URL
 * of some type. This URL is not necessarily a web url, it could be a file URL or reference to a BLOB in a db.
 * It is implicit that a document can have other related tables to it at least a one document to many notes which join on a documents 
 * id and categories which do the same. 
 */
 
class Document extends ORDataObject{
        
        /*
        *       Database unique identifier
        *       @var id
        */
        var $id;
        
        /*
        *       DB unique identifier reference to some other table, this is not unique in the document table
        *       @var int
        */
        var $foreign_id;
        
        /*
        *       Enumerated DB field which is met information about how to use the URL
        *       @var int can also be a the properly enumerated string
        */
        var $type;
        
        /*
        *       Array mapping of possible for values for the type variable
        *       mapping is array text name to index
        *       @var array
        */
        var $type_array = array();
        
        /*
        *       Size of the document in bytes if that is available
        *       @var int
        */
        var $size;
        
        /*
        *       Date the document was first persisted
        *       @var string
        */
        var $date;
        
        /*
        *       URL which point to the document, may be a file URL, a web URL, a db BLOB URL, or others
        *       @var string
        */
        var $url;
        
        /*
        *       Mimetype of the document if available
        *       @var string
        */
        var $mimetype;
        
        /*
        *       If the document is a multi-page format like tiff and has at least 1 page this will be 1 or greater, if a non-multi-page format this should be null or empty
        *       @var int
        */
        var $pages;
        
        /*
        *       Foreign key identifier of who initially persisited the document,
        *       potentially ownership could be changed but that would be up to an external non-document object process
        *       @var int
        */
        var $owner;
        
        /*
        *       Timestamp of the last time the document was changed and persisted, auto maintained by DB, manually change at your own peril
        *       @var int
        */
        var $revision;

        /*
        * Date (YYYY-MM-DD) logically associated with the document, e.g. when a picture was taken.
        * @var string
        */
        var $docdate;
        
        /*
        * 40-character sha1 hash key of the document from when it was uploaded. 
        * @var string
        */
        var $hash;
        
        /*
        * DB identifier reference to the lists table (the related issue), 0 if none.
        * @var int
        */
        var $list_id;

        /**
         * Constructor sets all Document attributes to their default value
         * @param int $id optional existing id of a specific document, if omitted a "blank" document is created 
         */
        function Document($id = "")     {
                //call the parent constructor so we have a _db to work with
                parent::ORDataObject();
                
                //shore up the most basic ORDataObject bits
                $this->id = $id;
                $this->_table = "documents";
                
                //load the enum type from the db using the parent helper function, this uses psuedo-class variables so it is really cheap
                $this->type_array = $this->_load_enum("type");
                
                $this->type = $this->type_array[0];
                $this->size = 0;
                $this->date = date("Y-m-d H:i:s");
                $this->url = "";
                $this->mimetype = "";
                $this->docdate = date("Y-m-d");
                $this->hash = "";
                $this->list_id = 0;
                
                if ($id != "") {
                        $this->populate();
                }
        }
        
        /**
         * Convenience function to get an array of many document objects
         * For really large numbers of documents there is a way more efficient way to do this by overwriting the populate method
         * @param int $foreign_id optional id use to limit array on to a specific relation, otherwise every document object is returned 
         */
        function documents_factory($foreign_id = "") {
                $documents = array();
                
                if (empty($foreign_id)) {
                         $foreign_id= "like '%'";
                }
                else {
                        $foreign_id= " = '" . mysql_real_escape_string(strval($foreign_id)) . "'";
                }
                
                $d = new Document();
                $sql = "SELECT id FROM  " . $d->_table . " WHERE foreign_id " .$foreign_id ;
                $result = $d->_db->Execute($sql);
                
                while ($result && !$result->EOF) {
                        $documents[] = new Document($result->fields['id']);
                        $result->MoveNext();
                }

                return $documents;
        }
        
        /**
         * Convenience function to get a document object from a url
         * Checks to see if there is an existing document with that URL and if so returns that object, otherwise
         * creates a new one, persists it and returns it
         * @param string $url  
         * @return object new or existing document object with the specified URL
         */
        function document_factory_url($url) {
                $d = new Document();
                //strip url handler, for now we always assume file://
                $filename = preg_replace("|^(.*)://|","",$url);
                
                if (!file_exists($filename)) {
                        die("An invalid URL was specified to crete a new document, this would only be caused if files are being deleted as you are working through the queue. '$filename'\n");  
                }
                
                $sql = "SELECT id FROM  " . $d->_table . " WHERE url= '" . mysql_real_escape_string($url) ."'" ;
                $result = $d->_db->Execute($sql);
                
                if ($result && !$result->EOF) {
                        if (file_exists($filename)) {
                                $d = new Document($result->fields['id']);
                        }
                        else {
                                $sql = "DELETE FROM  " . $d->_table . " WHERE id= '" . $result->fields['id'] ."'";
                                $result = $d->_db->Execute($sql);
                                echo("There is a database for the file but it no longer exists on the file system. Its document entry has been deleted. '$filename'\n");
                        }
                }
                else {
                        $file_command = $GLOBALS['oer_config']['document']['file_command_path'] ;
                        $cmd_args = "-i ".escapeshellarg($new_path.$fname);
                                
                        $command = $file_command." ".$cmd_args;
                        $mimetype = exec($command);
                        $mime_array = split(":", $mimetype);
                        $mimetype = $mime_array[1];
                        $d->set_mimetype($mimetype);
                        $d->url = $url;
                        $d->size = filesize($filename);
                        $d->type = $d->type_array['file_url'];
                        $d->persist();
                        $d->populate(); 
                }

                return $d;
        }
        
        /**
         * Convenience function to generate string debug data about the object
         */
        function toString($html = false) {
                $string .= "\n"
                . "ID: " . $this->id."\n"
                . "FID: " . $this->foreign_id."\n"
                . "type: " . $this->type . "\n"
                . "type_array: " . print_r($this->type_array,true) . "\n"
                . "size: " . $this->size . "\n"
                . "date: " . $this->date . "\n"
                . "url: " . $this->url . "\n"
                . "mimetype: " . $this->mimetype . "\n"
                . "pages: " . $this->pages . "\n"
                . "owner: " . $this->owner . "\n"
                . "revision: " . $this->revision . "\n"
                . "docdate: " . $this->docdate . "\n"
                . "hash: " . $this->hash . "\n"
                . "list_id: " . $this->list_id . "\n";

                if ($html) {
                        return nl2br($string);
                }
                else {
                        return $string;
                }
        }

        /**#@+
        *       Getter/Setter methods used by reflection to affect object in persist/poulate operations
        *       @param mixed new value for given attribute
        */
        function set_id($id) {
                $this->id = $id;
        }
        function get_id() {
                return $this->id;
        }
        function set_foreign_id($fid) {
                $this->foreign_id = $fid;
        }
        function get_foreign_id() {
                return $this->foreign_id;
        }
        function set_type($type) {
                $this->type = $type;
        }
        function get_type() {
                return $this->type;
        }
        function set_size($size) {
                $this->size = $size;
        }
        function get_size() {
                return $this->size;
        }       
        function set_date($date) {
                $this->date = $date;
        }
        function get_date() {
                return $this->date;
        }
    function set_hash($hash) {
                $this->hash = $hash;
        }
        function get_hash() {
            return $this->hash;
        }
        function set_url($url) {
                $this->url = $url;
        }
        function get_url() {
                return $this->url;
        }
        /**
        * this returns the url stripped down to basename
        */
        function get_url_web() {
                return basename($this->url);
        }
        /**
        * get the url without the protocol handler
        */
        function get_url_filepath() {
                return preg_replace("|^(.*)://|","",$this->url);
        }
        /**
        * get the url filename only
        */
        function get_url_file() {
                return basename(preg_replace("|^(.*)://|","",$this->url));
        }
        /**
        * get the url path only
        */
        function get_url_path() {
                return dirname(preg_replace("|^(.*)://|","",$this->url)) ."/";
        }
        function get_path_depth() {
                return $this->path_depth;
        }
        function set_path_depth($path_depth) {
                $this->path_depth = $path_depth;
        }
        function set_mimetype($mimetype) {
                $this->mimetype = $mimetype;
        }
        function get_mimetype() {
                return $this->mimetype;
        }
        function set_pages($pages) {
                $this->pages = $pages;
        }
        function get_pages() {
                return $this->pages;
        }
        function set_owner($owner) {
                $this->owner = $owner;
        }
        function get_owner() {
                return $this->owner;
        }
        /*
        *       No getter for revision because it is updated automatically by the DB.
        */
        function set_revision($revision) {
                $this->revision = $revision;
        }
        function set_docdate($docdate) {
                $this->docdate = $docdate;
        }
        function get_docdate() {
                return $this->docdate;
        }
        function set_list_id($list_id) {
                $this->list_id = $list_id;
        }
        function get_list_id() {
                return $this->list_id;
        }
        function get_ccr_type($doc_id){
    $type = sqlQuery("SELECT c.name FROM categories AS c LEFT JOIN categories_to_documents AS ctd ON c.id = ctd.category_id WHERE ctd.document_id = ?",array($doc_id));
    return $type['name'];
  }
        /*
        *       Overridden function to stor current object state in the db.
        *       current overide is to allow for a just in time foreign id, often this is needed 
        *       when the object is never directly exposed and is handled as part of a larger
        *       object hierarchy.
        *       @param int $fid foreign id that should be used so that this document can be related (joined) on it later
        */
        
        function persist($fid ="") {
                if (!empty($fid)) {
                        $this->foreign_id = $fid;
                }
                parent::persist();
        }
        
        function set_storagemethod($str) {
            $this->storagemethod = $str;
        }
        
        function get_storagemethod() {
            return $this->storagemethod;
        }
        
        function set_couch_docid($str) {
            $this->couch_docid = $str;
        }
        
        function get_couch_docid() {
            return $this->couch_docid;
        }
        
        function set_couch_revid($str) {
            $this->couch_revid = $str;
        }
        
        function get_couch_revid() {
            return $this->couch_revid;
        }
        
        function get_couch_url($pid,$encounter){
            $couch_docid = $this->get_couch_docid();
            $couch_url = $this->get_url();
            $couch = new CouchDB();
            $data = array($GLOBALS['couchdb_dbase'],$couch_docid,$pid,$encounter);
            $resp = $couch->retrieve_doc($data);
            $content = $resp->data;
                        $temp_url=$couch_url;
                        $temp_url = $GLOBALS['OE_SITE_DIR'] . '/documents/temp/' . $pid . '_' . $couch_url;
                        $f_CDB = fopen($temp_url,'w');
            fwrite($f_CDB,base64_decode($content));
            fclose($f_CDB);
                        return $temp_url;
        }

  // Function added by Rod to change the patient associated with a document.
  // This just moves some code that used to be in C_Document.class.php,
  // changing it as little as possible since I'm not set up to test it.
  //
  function change_patient($new_patient_id) {
    $couch_docid = $this->get_couch_docid();
    $couch_revid = $this->get_couch_revid();

    // Set the new patient in CouchDB.
    if ($couch_docid && $couch_revid) {
      $couch = new CouchDB();
      $db = $GLOBALS['couchdb_dbase'];
      $data = array($db, $couch_docid);
      $couchresp = $couch->retrieve_doc($data);
      // CouchDB doesnot support updating a single value in a document.
      // Have to retrieve the entire document, update the necessary value and save again
      list ($db, $docid, $revid, $patient_id, $encounter, $type, $json) = $data;
      $data = array($db, $couch_docid, $couch_revid, $new_patient_id, $couchresp->encounter,
        $couchresp->mimetype, json_encode($couchresp->data));
      $resp = $couch->update_doc($data);
      // Sometimes the response from CouchDB is not available, still it would
      // have saved in the DB. Hence check one more time.
      if(!$resp->_id || !$resp->_rev){
              $data = array($db, $couch_docid, $new_patient_id, $couchresp->encounter);
              $resp = $couch->retrieve_doc($data);
      }
      if($resp->_rev == $couch_revid) {
        return false;
            }
      else {
        $this->set_couch_revid($resp->_rev);
      }
    }

    // Set the new patient in mysql.
    $this->set_foreign_id($new_patient_id);
    $this->persist();

    // Return true for success.
    return true;
  }

} // end of Document

/*
$d = new Document(3);
$d->type = $d->type_array[1];
$d->url = "file:///tmp/test.gif";
$d->pages = 0;
$d->owner = 60;
$d->size = 8000;
$d->foreign_id = 25;
$d->persist();
$d->populate();

echo $d->toString(true);*/
?>