poodllfilelib.php

<?php

/**
 * internal library of functions and constants for Poodll modules
 * accessed directly by poodll flash wdgets on web pages.
 *
 * @package filter_poodll
 * @category mod
 * @author Justin Hunt
 *
 */

/**
 * Includes and requires
 */

global $CFG;

//we need to do this, because when called from a widet, cfg is not set
//but the relative path fails from a quiz but it has alreadconvert_with_ffmpeg_bgy been set in that case
//, so we check before we call it, to cover both httpsbases

if (!isset($CFG)) {
    require_once("../../config.php");
}

//we would almost always require login, except in the special case where its an upload from
//the iframe embed ... then we don't. Because users won't be logged in, in that case.	
$datatype = optional_param('datatype', "", PARAM_TEXT);    // Type of action/data we are requesting
if ($datatype != 'handleuploadfromiframeembed') {
    require_login();
}

//we do file operations here, so we need this
require_once($CFG->libdir . '/filelib.php');

$contextid = optional_param('contextid', 0, PARAM_INT);  // the id of the course 
$courseid = optional_param('courseid', 0, PARAM_INT);  // the id of the course 
$moduleid = optional_param('moduleid', 0, PARAM_INT);  // the id of the module 
//added justin 20120803 careful here, I think $component is a php keyword or something
//it screwed the whole world
$comp = optional_param('component', "", PARAM_TEXT);  // the component
$farea = optional_param('filearea', "", PARAM_TEXT);  // the filearea

$itemid = optional_param('itemid', 0, PARAM_INT);  // the id of the module
$hash = optional_param('hash', "", PARAM_TEXT);  // file or dir hash
$requestid = optional_param('requestid', "", PARAM_TEXT);  // file or dir hash
$paramone = optional_param('paramone', "", PARAM_TEXT);  // nature of value depends on datatype, maybe path
$paramtwo = optional_param('paramtwo', "", PARAM_TEXT);  // nature of value depends on datatype, maybe protocol
$paramthree = optional_param('paramthree', "", PARAM_TEXT);  // nature of value depends on datatype, maybe filearea

//from the general recorder (mp3)
$p1 = optional_param('p1', "", PARAM_TEXT);
$p2 = optional_param('p2', "", PARAM_TEXT);
$p3 = optional_param('p3', "", PARAM_TEXT);
$p4 = optional_param('p4', "", PARAM_TEXT);
$p5 = optional_param('p5', "", PARAM_TEXT);
$filedata = optional_param('filedata', "", PARAM_TEXT);
$fileext = optional_param('fileext', "", PARAM_TEXT);

//from the universal recorder
//from the general recorder (mp3)
$mediatype = optional_param('mediatype', "", PARAM_TEXT);
$filename = optional_param('filename', "", PARAM_TEXT);

//error log flags
CONST LOG_PFL_TEMPDIR_FAIL = 1;
CONST LOG_PFL_SAVEFILE_FAIL=2;
CONST LOG_PFL_FILE_EXISTS = 3;
CONST LOG_PFL_MAKE_SF_FAIL = 4;
CONST LOG_PFL_LOCAL_CONVERT_FAIL = 5;
CONST LOG_PFL_DOWNLOAD_FAIL = 6;
CONST LOG_PFL_CREATE_FROM_URL_FAIL = 7;
CONST LOG_PFL_FILE_CREATED = 8;


//map general recorder upload data to what we expect otherwise
if ($p1 != '') {
    $contextid = $p2;
    $comp = $p3;
    $farea = $p4;
    $itemid = $p5;
    $paramone = $filedata;
    $paramtwo = $fileext;
    $paramthree = 'audio';
}

switch ($datatype) {
    case "confirmarrival":
        header("Content-type: text/xml");
        echo "<?xml version=\"1.0\"?>\n";
        //uploadfile filedata(base64), fileextension (needs to be cleaned), blah blah 
        //paramone is the file data, paramtwo is the file extension, paramthree is the mediatype (audio,video, image)
        //requestid is the actionid
        $returnxml = filter_poodll_confirmarrival($mediatype, $filename);
        break;

    case "uploadfile":
        header("Content-type: text/xml");
        echo "<?xml version=\"1.0\"?>\n";
        //uploadfile filedata(base64), fileextension (needs to be cleaned), blah blah 
        //paramone is the file data, paramtwo is the file extension, paramthree is the mediatype (audio,video, image)
        //requestid is the actionid
        $returnxml = filter_poodll_uploadfile($paramone, $paramtwo, $paramthree, $requestid, $contextid, $comp, $farea, $itemid);
        break;

    case "poodllpluginfile":
        //poodllpluginfile($contextid,$component,$filearea,$itemid,$filepath,$filename);
        //lets hard code this for now, very very mild security
        filter_poodll_poodllpluginfile($contextid, "mod_assignment", "submission", $itemid, "/", $paramone);
        return;

    case "handles3upload":
        $returnxml = filter_poodll_handle_s3_upload($mediatype, $contextid, $comp, $farea, $itemid, $filename);
        //probably not necessary to return anything, but just in case
        if (!$returnxml) {
            return;
        }
        header("Content-type: text/xml");
        echo "<?xml version=\"1.0\"?>";
        break;

    case "instancedownload":
        //paramone=mimetype paramtwo=path paramthree=hash
        filter_poodll_instance_download($paramone, $paramtwo, $hash, $requestid);

    case "instanceremotedownload":
        //($contextid,$filename,$component, $filearea,$itemid, $requestid)
        //e.g (15, '123456789.flv','user','draft','746337947',777777)
        $returnxml = filter_poodll_instance_remotedownload($contextid, $paramone, $paramtwo, $paramthree, $itemid, $requestid);

        //move the output to here so that there is no trace of stray characters entering output before file downloaded
        header("Content-type: text/xml");
        echo "<?xml version=\"1.0\"?>";

        break;

    case "speaktext":
        $audiodata = filter_poodll_speaktext($paramone);
        $audiobytes = $audiodata->get('AudioStream')->getContents();

        header('Content-Transfer-Encoding: binary');
        //safari only like audio/mpeg .... i hope its not a problem
        //header('Content-Type: audio/mpeg, audio/x-mpeg, audio/x-mpeg-3, audio/mpeg3');
        header('Content-Type: audio/mpeg');

        header('Content-length: ' . strlen($audiobytes));
        header('X-Pad: avoid browser bug');
        header('Cache-Control: no-cache');

        echo $audiobytes;
        return;
    default:
        return;

}//end of switch

echo $returnxml;
return;

//**************************************************************
//**************************************************************
//**************************************************************
//**************************************************************

//this initialises and returns a results array
function filter_poodll_fetchReturnArray($initsuccess = false) {
    //new filearray
    $return = array();
    $return['messages'] = array();
    $return['success'] = $initsuccess;
    return $return;
}

//this turns our results array into an xml string for returning to browser
function filter_poodll_prepareXMLReturn($resultArray, $requestid) {
    //set up xml to return
    $xml_output = "<result requestid='" . $requestid . "'>";

    if ($resultArray['success']) {
        $xml_output .= 'success';
        foreach ($resultArray['messages'] as $message) {
            $xml_output .= '<filename>' . $message . '</filename>';
        }
    } else {
        $xml_output .= 'failure';
        foreach ($resultArray['messages'] as $message) {
            $xml_output .= '<error>' . $message . '</error>';
        }
    }

    //close off xml to return
    $xml_output .= "</result>";
    return $xml_output;
}

//this turns our results array into an xml string for returning to browser
function filter_poodll_prepareLegacyXMLReturn($resultArray, $requestid) {
    //set up xml to return
    $xml_output = "<result requestid='" . $requestid . "'>";

    if ($resultArray['success']) {
        $xml_output .= 'success';
        foreach ($resultArray['messages'] as $message) {
            //wpould like to change this errponeous use of word error, but need to 
            //recompile recorders ..hassle J
            $xml_output .= '<error>' . $message . '</error>';
        }
    } else {
        $xml_output .= 'failure';
        foreach ($resultArray['messages'] as $message) {
            $xml_output .= '<error>' . $message . '</error>';
        }
    }

    //close off xml to return
    $xml_output .= "</result>";
    return $xml_output;
}

//For uploading a file direct from an HTML5 or SWF widget
function filter_poodll_uploadfile($filedata, $fileextension, $mediatype, $actionid, $contextid, $comp, $farea, $itemid) {
    global $CFG, $USER;

    //setup our return object
    $return = filter_poodll_fetchReturnArray(true);

    //make sure nobodyapassed in a bogey file extension
    switch ($fileextension) {
        case "mp3":
        case "flv":
        case "jpg":
        case "png":
        case "xml":
        case "mov":
        case "wav":
        case "mp4":
        case "3gpp":
        case "3gp":
        case "3g2":
        case "aac":
        case "wma":
        case "m4a":
        case "m4v":
        case "wmv":
        case "smf":
        case "amr":
        case "ogg":
        case "webm":
            break;

        case "":
        default:
            //if we are set to FFMPEG convert,lets  not muddle with the file extension
            if ($CFG->filter_poodll_ffmpeg && $mediatype == 'audio' && $CFG->filter_poodll_audiotranscode) {
                //do nothing
            } else if ($CFG->filter_poodll_ffmpeg && $mediatype == 'video' && $CFG->filter_poodll_videotranscode) {
                //do nothing
            } else {
                if ($mediatype == 'video') {
                    $fileextension = "mp4";
                } else if ($mediatype == 'image') {
                    $fileextension = "jpg";
                } else {
                    $fileextension = "mp3";
                }
            }
    }

    //init our fs object
    $fs = get_file_storage();
    //assume a root level filepath
    $filepath = "/";

    //make our filerecord
    $record = new stdClass();
    $record->filearea = $farea;
    $record->component = $comp;
    $record->filepath = $filepath;
    $record->itemid = $itemid;
    $record->license = $CFG->sitedefaultlicense;
    $record->author = 'Moodle User';
    $record->contextid = $contextid;
    $record->userid = $USER->id;
    $record->source = '';

    //make filename and set it
    //we are trying to remove useless junk in the draft area here
    //when we know its stable, we will do the same for non images too
    if ($mediatype == 'image') {
        $filenamebase = "upfile_" . $actionid;
    } else {
        $filenamebase = "upfile_" . rand(100, 32767) . rand(100, 32767);
    }
    $fileextension = "." . $fileextension;
    $filename = $filenamebase . $fileextension;
    $record->filename = $filename;

    //if file already exists, raise an error
    if ($fs->file_exists($contextid, $comp, $farea, $itemid, $filepath, $filename)) {
        if ($mediatype == 'image') {
            \filter_poodll\poodlltools::send_debug_data(LOG_PFL_FILE_EXISTS,
                    'image file already exists. will delete and try:' . $filename, $USER->id, $contextid, 'poodllfilelib.php');
            //delete any existing draft files.
            $file = $fs->get_file($contextid, $comp, $farea, $itemid, $filepath, $filename);
            $file->delete();

            //check there is no metadata prefixed to the base 64. From OL widgets, none, from JS yes
            $metapos = strPos($filedata, ",");
            if ($metapos > 10 && $metapos < 30) {
                $filedata = substr($filedata, $metapos + 1);
            }

            //decode the data and store it
            $xfiledata = base64_decode($filedata);
            //create the file
            $stored_file = $fs->create_file_from_string($record, $xfiledata);

        } else {
            \filter_poodll\poodlltools::send_debug_data(LOG_PFL_FILE_EXISTS, 'Quitting. file already exists:' . $filename,
                    $USER->id, $contextid, 'poodllfilelib.php');
            $stored_file = false;
            $return['success'] = false;
            array_push($return['messages'], "Already exists, file with filename:" . $filename);
        }
    } else {

        //check there is no metadata prefixed to the base 64. From OL widgets, none, from JS yes
        //if so it will look like this: data:image/png;base64,iVBORw0K
        //we remove it, there must be a better way of course ...
        //$metapos = strPos($filedata,";base64,");
        $metapos = strPos($filedata, ",");
        if ($metapos !==false && $metapos <100) {
            //$trunced = substr($filedata,0,$metapos+8);
            $filedata = substr($filedata, $metapos + 1);

        }

        //decode the data and store it in memory
        $xfiledata = base64_decode($filedata);

        //Determine if we need to convert and what format the conversions should take
        if ($CFG->filter_poodll_ffmpeg && $CFG->filter_poodll_audiotranscode && $fileextension != ".mp3" && $mediatype == "audio") {
            $convext = ".mp3";
        } else if ($CFG->filter_poodll_ffmpeg && $CFG->filter_poodll_videotranscode && $fileextension != ".mp4" &&
                $mediatype == "video") {
            $convext = ".mp4";
        } else {
            $convext = false;
        }

        //if we need to convert with ffmpeg, get on with it
        if ($convext) {
            //determine the temp directory
            $tempdir = $CFG->tempdir . "/";

            //actually make the file on disk so FFMPEG can get it
            $ret = file_put_contents($tempdir . $filename, $xfiledata);

            //if successfully saved to disk, convert
            if ($ret) {
                $do_bg_encoding = ($CFG->filter_poodll_bgtranscode_audio && $convext == ".mp3") ||
                        ($CFG->filter_poodll_bgtranscode_video && $convext == ".mp4");
                if ($do_bg_encoding && $CFG->version >= 2014051200) {
                    $stored_file = \filter_poodll\poodlltools::convert_with_ffmpeg_bg($record, $filename, $filenamebase, $convext);
                } else {
                    $stored_file = \filter_poodll\poodlltools::convert_with_ffmpeg($record, $filename, $filenamebase, $convext);
                }
                if ($stored_file) {
                    $filename = $stored_file->get_filename();

                    //if failed, default to using the original uploaded data
                    //and delete the temp file we made
                } else {
                    \filter_poodll\poodlltools::send_debug_data(LOG_PFL_MAKE_SF_FAIL, 'Unable to create stored file:' . $filename,
                            $USER->id, $contextid, 'poodllfilelib.php');
                    $stored_file = $fs->create_file_from_string($record, $xfiledata);
                    if (is_readable(realpath($tempdir . $filename))) {
                        unlink(realpath($tempdir . $filename));
                    }
                }

                //if couldn't create on disk fall back to the original data
            } else {
                \filter_poodll\poodlltools::send_debug_data(LOG_PFL_TEMPDIR_FAIL, 'Unable to save file to temp dir:' . $filename,
                        $USER->id, $contextid, 'poodllfilelib.php');
                $stored_file = $fs->create_file_from_string($record, $xfiledata);
            }

            //if we are not converting, then just create our moodle file entry with original file data
        } else {
            $stored_file = $fs->create_file_from_string($record, $xfiledata);
        }

    }

    //if successful return filename
    if ($stored_file) {
        array_push($return['messages'], $filename);
        \filter_poodll\poodlltools::send_debug_data(LOG_PFL_FILE_CREATED, 'Successfully created:' . $filename, $USER->id,
                $contextid, 'poodllfilelib.php');

        //if unsuccessful, return error
    } else {
        \filter_poodll\poodlltools::send_debug_data(LOG_PFL_SAVEFILE_FAIL, 'Unable to save file with:' . $filename, $USER->id,
                $contextid, 'poodllfilelib.php');
        $return['success'] = false;
        array_push($return['messages'], "unable to save file with filename:" . $filename);
    }

    //we process the result for return to browser
    $xml_output = filter_poodll_prepareXMLReturn($return, $actionid);

    //we return to widget/client the result of our file operation
    return $xml_output;
}

/*
* This function is a simple replacement for pluginfile.php when called from assignemnets
* There is whitespace, newline chars, added at present(20120306) so need to bypass
*
*/
function filter_poodll_poodllpluginfile($contextid, $component, $filearea, $itemid, $filepath, $filename) {

    $fs = get_file_storage();
    $br = get_file_browser();
    $f = $fs->get_file($contextid, $component, $filearea, $itemid, $filepath, $filename);

    //if no file we just quit.
    if (!$f) {
        return;
    }

    $fcontent = $f->get_content();
    send_file($fcontent, $filename, 0, 0, true, true, "video/x-flv");
    return;
}

/* Here we check if the file has been received over on S3 */
function filter_poodll_confirmarrival($mediatype, $filename) {
    global $CFG, $USER;

    $return = filter_poodll_fetchReturnArray(true);

    $return['success'] = false;
    $ret = \filter_poodll\poodlltools::confirm_s3_arrival($mediatype, $filename);

    if ($ret) {
        array_push($return['messages'], 'file arrived:' . $filename);
    } else {
        array_push($return['messages'], "no file arrival");
    }

    //we process the result for return to browser
    $xml_output = filter_poodll_prepareXMLReturn($return, '99999');

    //we return to browser the result of our file operation
    return $xml_output;

    //set up return object

}

/* The alerts us to the fact that the file has been uploaded to S3. We commence handling */
function filter_poodll_handle_s3_upload($mediatype, $contextid, $comp, $farea, $itemid, $filename) {

    $return = filter_poodll_fetchReturnArray(true);

    global $CFG, $USER;
    $draftfilerecord = new stdClass();
    $draftfilerecord->userid = $USER->id;
    $draftfilerecord->contextid = $contextid;
    $draftfilerecord->component = $comp;
    $draftfilerecord->filearea = $farea;
    $draftfilerecord->itemid = $itemid;
    $draftfilerecord->filepath = '/';
    $draftfilerecord->filename = $filename;
    $draftfilerecord->license = $CFG->sitedefaultlicense;
    $draftfilerecord->author = 'Moodle User';
    $draftfilerecord->source = '';
    $draftfilerecord->timecreated = time();
    $draftfilerecord->timemodified = time();

    $ret = \filter_poodll\poodlltools::postprocess_s3_upload($mediatype, $draftfilerecord);

    if (!$ret) {
        $return['success'] = false;
        array_push($return['messages'], "Unable to postprocess s3 upload.");
    }

    //we process the result for return to browser
    $xml_output = filter_poodll_prepareXMLReturn($return, '99999');

    //we return to browser the result of our file operation
    return $xml_output;

    //set up return object

}

/* download file from remote server and stash it in our file area */
//15,'123456789.flv','user','draft','746337947','99999'
function filter_poodll_instance_remotedownload($contextid, $filename, $component, $filearea, $itemid, $requestid, $filepath = '/') {
    global $CFG, $USER;

    //set up return object
    $return = filter_poodll_fetchReturnArray(true);

    //set up auto transcoding (mp3 or mp4) or not
    //The jsp to call is different.
    $jsp = "download.jsp";
    $convertlocally = false;
    $convertremotely = false;
    $downloadfilename = $filename;
    $ext = substr($filename, -4);
    $filenamebase = substr($filename, 0, -4);

    switch ($ext) {

        case ".mp4":
        case ".mp3":
            if ($CFG->filter_poodll_cloudrecording) {
                $convertremotely = true;
                $downloadfilename = $filenamebase . ".flv";
            } else if ($CFG->filter_poodll_ffmpeg) {
                $convertlocally = true;
                $downloadfilename = $filenamebase . ".flv";
            } else {
                $jsp = "convert.jsp";
            }
            break;

        case ".png":
            $jsp = "snapshot.jsp";
            break;

        default:
            $jsp = "download.jsp";
            break;
    }

    //setup our file manipulators
    $fs = get_file_storage();
    $browser = get_file_browser();

    //create the file record for our new file
    $file_record = new stdClass();
    $file_record->userid = $USER->id;
    $file_record->contextid = $contextid;
    $file_record->component = $component;
    $file_record->filearea = $filearea;
    $file_record->itemid = $itemid;
    $file_record->filepath = $filepath;
    $file_record->filename = $filename;
    $file_record->license = $CFG->sitedefaultlicense;
    $file_record->author = 'Moodle User';
    $file_record->source = '';
    $file_record->timecreated = time();
    $file_record->timemodified = time();

    //if file already exists, delete it
    //we could use fileinfo, but it don&'t work
    if ($fs->file_exists($contextid, $component, $filearea, $itemid, $filepath, $filename)) {
        //delete here ---
    }

    //setup download information
    $red5_fileurl = "http://" . $CFG->filter_poodll_servername .
            ":" . $CFG->filter_poodll_serverhttpport . "/poodll/" . $jsp . "?poodllserverid=" .
            $CFG->filter_poodll_serverid . "&filename=" . $downloadfilename . "&caller=" . urlencode($CFG->wwwroot);

    //echo $red5_fileurl . '<br />';		

    //download options
    $options = array();
    $options['headers'] = null;
    $options['postdata'] = null;
    $options['fullresponse'] = false;
    $options['timeout'] = 300;
    $options['connecttimeout'] = 20;
    $options['skipcertverify'] = false;
    $options['calctimeout'] = false;

    //clear the output buffer, otherwise strange characters can get in to our file
    //seems to have no effect though ...
    while (ob_get_level()) {
        ob_end_clean();
    }

    //convert remotely on AWS
    if ($convertremotely) {
        $mediatype = 'video';


        switch ($ext) {
            case '.mp4':
                $mediatype = 'video';
                break;
            case '.mp3':
                $mediatype = 'audio';
                break;
        }



        //register remote Job
        $transcribelanguage = "en-US";
        \filter_poodll\poodlltools::register_remote_poodlljob($mediatype,$filename,$transcribelanguage);
        $key = \filter_poodll\awsremote::fetch_s3_filename($mediatype, $filename);

        //pull file from red5 and post it to S3
        $awsremote = new \filter_poodll\awsremote();
        $tempfilepath = $CFG->tempdir . "/source_" . $filename;
        $awsremote->save_from_url_to_file($red5_fileurl,$tempfilepath);
        $success = $awsremote->s3_put_filedata($mediatype, $key, $tempfilepath);

        if($success) {
            $success = \filter_poodll\poodlltools::postprocess_s3_upload($mediatype, $file_record);
        }
        if (!$success) {
            $return['success'] = false;
            array_push($return['messages'], "Unable to setup s3 post processing.");
        } else {
            //setup our return object
            $return['success'] = true;
            array_push($return['messages'], $filename);
        }

        //we process the result for return to browser
        $xml_output = filter_poodll_prepareLegacyXMLReturn($return, $requestid);

        //we return to browser the result of our file operation
        return $xml_output;

    }

    //Convert locally using FFMPEG
    if ($convertlocally) {
        //determine the temp directory
        $tempdir = $CFG->tempdir . "/";

        //actually make the file on disk so FFMPEG can get it
        $mediastring = download_file_content($red5_fileurl);

        $ret = file_put_contents($tempdir . $downloadfilename, $mediastring);

        //if successfully saved to disk, convert
        if ($ret) {
            $do_bg_encoding = ($CFG->filter_poodll_bgtranscode_audio && $ext == ".mp3") ||
                    ($CFG->filter_poodll_bgtranscode_video && $ext == ".mp4");

            if ($do_bg_encoding) {
                $stored_file =
                        \filter_poodll\poodlltools::convert_with_ffmpeg_bg($file_record, $downloadfilename, $filenamebase, $ext);
            } else {
                $stored_file =
                        \filter_poodll\poodlltools::convert_with_ffmpeg($file_record, $downloadfilename, $filenamebase, $ext);
            }

            if ($stored_file) {
                $filename = $stored_file->get_filename();
                //setup our return object
                $returnfilepath = $filename;
                array_push($return['messages'], $returnfilepath);

                //if failed, default to using the original uploaded data
                //and delete the temp file we made
            } else {
                \filter_poodll\poodlltools::send_debug_data(LOG_PFL_LOCAL_CONVERT_FAIL,
                        'Unable to convert locally:' . $downloadfilename,
                        $USER->id, $contextid, 'poodllfilelib.php');
                $return['success'] = false;
                array_push($return['messages'], "Unable to convert file locally.");

                if (is_readable(realpath($tempdir . $filename))) {
                    unlink(realpath($tempdir . $filename));
                }
            }
        } else {
            \filter_poodll\poodlltools::send_debug_data(LOG_PFL_DOWNLOAD_FAIL,
                    'Unable to download ' . $red5_fileurl . 'and save to:' . $tempdir . $downloadfilename,
                    $USER->id, $contextid, 'poodllfilelib.php');
            $return['success'] = false;
            array_push($return['messages'], "Unable to create local temp file.");
        }

        //we process the result for return to browser
        $xml_output = filter_poodll_prepareLegacyXMLReturn($return, $requestid);

        //we return to browser the result of our file operation
        return $xml_output;
    }//end of if converting locally

    //If get here we are downloading from JSP only, ie not converting locally or remotely
    //We actually copy over the file from remote server
    if (!$fs->create_file_from_url($file_record, $red5_fileurl, $options, false)) {
        \filter_poodll\poodlltools::send_debug_data(LOG_PFL_CREATE_FROM_URL_FAIL,
                'Unable to create from URL:' . $red5_fileurl,
                $USER->id, $contextid, 'poodllfilelib.php');
        $return['success'] = false;
        array_push($return['messages'], "Unable to create file from url.");
    } else {
        //get a file object if successful
        $thecontext = context::instance_by_id($contextid);//get_context_instance_by_id($contextid);
        $fileinfo = $browser->get_file_info($thecontext, $component, $filearea, $itemid, $filepath, $filename);

        //if we could get a fileinfo object, return the url of the object
        if ($fileinfo) {
            $returnfilepath = $filename;
            array_push($return['messages'], $returnfilepath);
        } else {
            //if we couldn't get an url and it is a draft file, guess the URL
            //<p><a href="http://m2.poodll.com/draftfile.php/5/user/draft/875191859/IMG_0594.MOV">IMG_0594.MOV</a></p>
            if ($filearea == 'draft') {

                $returnfilepath = $filename;
                array_push($return['messages'], $returnfilepath);
            } else {
                $return['success'] = false;
                array_push($return['messages'], "Unable to get URL for file.");
            }
        }//end of if fileinfo

    }//end of if could create_file_from_url

    //we process the result for return to browser
    $xml_output = filter_poodll_prepareLegacyXMLReturn($return, $requestid);

    //we return to browser the result of our file operation
    return $xml_output;

}

function filter_poodll_instance_download($mimetype, $filename, $filehash, $requestid) {
    //paramone=mimetype paramtwo=filename paramthree=filehash requestid,
    header("Cache-Control: public");
    header("Content-Description: File Transfer");
    header("Content-Disposition: attachment;filename='" . $filename . "'");
    header("Content-Type: " . $mimetype);
    header("Content-Transfer-Encoding: binary");
    //header('Accept-Ranges: bytes');

    $fs = get_file_storage();
    $f = $fs->get_file_by_hash($filehash);
    if ($f) {
        //$content = $f->get_content();
        //echo $content;
        $f->readfile();
    } else {
        //set up return object
        $return = filter_poodll_fetchReturnArray(false);
        array_push($return['messages'], "file not found.");
        $xml_output = filter_poodll_prepareLegacyXMLReturn($return, $requestid);
        header("Content-type: text/xml");
        echo "<?xml version=\"1.0\"?>\n";
        echo $xml_output;
        return;
    }
}