portfolio/add.php

   1 <?php
   2 // This file is part of Moodle - http://moodle.org/
   3 //
   4 // Moodle is free software: you can redistribute it and/or modify
   5 // it under the terms of the GNU General Public License as published by
   6 // the Free Software Foundation, either version 3 of the License, or
   7 // (at your option) any later version.
   8 //
   9 // Moodle is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13 //
  14 // You should have received a copy of the GNU General Public License
  15 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 /**
  18  * This file is the main controller to do with the portfolio export wizard.
  19  *
  20  * @package core_portfolio
  21  * @copyright 2008 Penny Leach <penny@catalyst.net.nz>,
  22  *            Martin Dougiamas <http://dougiamas.com>
  23  * @license http://www.gnu.org/copyleft/gpl.html GNU GPL
  24  */
  25 require_once(dirname(dirname(__FILE__)) . '/config.php');
  26
  27 if (empty($CFG->enableportfolios)) {
  28     print_error('disabled', 'portfolio');
  29 }
  30
  31 require_once($CFG->libdir . '/portfoliolib.php');
  32 require_once($CFG->libdir . '/portfolio/exporter.php');
  33 require_once($CFG->libdir . '/portfolio/caller.php');
  34 require_once($CFG->libdir . '/portfolio/plugin.php');
  35
  36 $dataid        = optional_param('id', 0, PARAM_INT);                          // id of partially completed export. corresponds to a record in portfolio_tempdata
  37 $type          = optional_param('type', null, PARAM_SAFEDIR);                 // if we're returning from an external system (postcontrol) for a single-export only plugin
  38 $cancel        = optional_param('cancel', 0, PARAM_RAW);                      // user has cancelled the request
  39 $cancelsure    = optional_param('cancelsure', 0, PARAM_BOOL);                 // make sure they confirm first
  40 $logreturn     = optional_param('logreturn', 0, PARAM_BOOL);                  // when cancelling, we can also come from the log page, rather than the caller
  41 $instanceid    = optional_param('instance', 0, PARAM_INT);                    // instanceof of configured portfolio plugin
  42 $courseid      = optional_param('course', 0, PARAM_INT);                      // courseid the data being exported belongs to (caller object should provide this later)
  43 $stage         = optional_param('stage', PORTFOLIO_STAGE_CONFIG, PARAM_INT);  // stage of the export we're at (stored in the exporter)
  44 $postcontrol   = optional_param('postcontrol', 0, PARAM_INT);                 // when returning from some bounce to an external system, this gets passed
  45 $callbackfile  = optional_param('callbackfile', null, PARAM_PATH);            // callback file eg /mod/forum/lib.php - the location of the exporting content
  46 $callbackclass = optional_param('callbackclass', null, PARAM_ALPHAEXT);       // callback class eg forum_portfolio_caller - the class to handle the exporting content.
  47 $callerformats = optional_param('callerformats', null, PARAM_TAGLIST);        // comma separated list of formats the specific place exporting content supports
  48
  49 require_login();  // this is selectively called again with $course later when we know for sure which one we're in.
  50 $PAGE->set_context(get_system_context());
  51 $PAGE->set_url('/portfolio/add.php', array('id' => $dataid, 'sesskey' => sesskey()));
  52 $PAGE->set_pagelayout('standard');
  53 $exporter = null;
  54
  55 if ($postcontrol && $type && !$dataid) {
  56     // we're returning from an external system that can't construct dynamic return urls
  57     // this is a special "one export of this type only per session" case
  58     if (portfolio_static_function($type, 'allows_multiple_exports')) {
  59         throw new portfolio_exception('multiplesingleresume', 'portfolio');
  60     }
  61
  62     if (!$dataid = portfolio_export_type_to_id($type, $USER->id)) {
  63         throw new portfolio_exception('invalidtempid', 'portfolio');
  64     }
  65 } else {
  66     // we can't do this in the above case, because we're redirecting straight back from an external system
  67     // this is not really ideal, but since we're in a "staged" wizard, the session key is checked in other stages.
  68     require_sesskey(); // pretty much everything in this page is a write that could be hijacked, so just do this at the top here
  69 }
  70
  71 // if we have a dataid, it means we're in the middle of an export,
  72 // so rewaken it and continue.
  73 if (!empty($dataid)) {
  74     try {
  75         $exporter = portfolio_exporter::rewaken_object($dataid);
  76     } catch (portfolio_exception $e) {
  77         // this can happen in some cases, a cancel request is sent when something is already broken
  78         // so process it elegantly and move on.
  79         if ($cancel) {
  80             if ($logreturn) {
  81                 redirect($CFG->wwwroot . '/user/portfoliologs.php');
  82             }
  83             redirect($CFG->wwwroot);
  84         } else {
  85             throw $e;
  86         }
  87     }
  88     // we have to wake it up first before we can cancel it
  89     // so temporary directories etc get cleaned up.
  90     if ($cancel) {
  91         if ($cancelsure) {
  92             $exporter->cancel_request($logreturn);
  93         } else {
  94             portfolio_export_pagesetup($PAGE, $exporter->get('caller'));
  95             $exporter->print_header(get_string('confirmcancel', 'portfolio'));
  96             echo $OUTPUT->box_start();
  97             $yesbutton = new single_button(new moodle_url('/portfolio/add.php', array('id' => $dataid, 'cancel' => 1, 'cancelsure' => 1, 'logreturn' => $logreturn)), get_string('yes'));
  98             if ($logreturn) {
  99                 $nobutton  = new single_button(new moodle_url('/user/portfoliologs.php'), get_string('no'));
 100             } else {
 101                 $nobutton  = new single_button(new moodle_url('/portfolio/add.php', array('id' => $dataid)), get_string('no'));
 102             }
 103             echo $OUTPUT->confirm(get_string('confirmcancel', 'portfolio'), $yesbutton, $nobutton);
 104             echo $OUTPUT->box_end();
 105             echo $OUTPUT->footer();
 106             exit;
 107         }
 108     }
 109     // verify we still belong to the correct user and permissions are still ok
 110     $exporter->verify_rewaken();
 111     // if we don't have an instanceid in the exporter
 112     // it means we've just posted from the 'choose portfolio instance' page
 113     // so process that and start up the portfolio plugin
 114     if (!$exporter->get('instance')) {
 115         if ($instanceid) {
 116             try {
 117                 $instance = portfolio_instance($instanceid);
 118             } catch (portfolio_exception $e) {
 119                 portfolio_export_rethrow_exception($exporter, $e);
 120             }
 121             // this technically shouldn't happen but make sure anyway
 122             if ($broken = portfolio_instance_sanity_check($instance)) {
 123                 throw new portfolio_export_exception($exporter, $broken[$instance->get('id')], 'portfolio_' . $instance->get('plugin'));
 124             }
 125             // now we're all set up, ready to go
 126             $instance->set('user', $USER);
 127             $exporter->set('instance', $instance);
 128             $exporter->save();
 129         }
 130     }
 131
 132     portfolio_export_pagesetup($PAGE, $exporter->get('caller')); // this calls require_login($course) if it can..
 133
 134 // completely new request, look to see what information we've been passed and set up the exporter object.
 135 } else {
 136     // you cannot get here with no information for us, we must at least have the caller.
 137     if (empty($_GET) && empty($_POST)) {
 138         portfolio_exporter::print_expired_export();
 139     }
 140     // we'e just posted here for the first time and have might the instance already
 141     if ($instanceid) {
 142         // this can throw exceptions but there's no point catching and rethrowing here
 143         // as the exporter isn't created yet.
 144         $instance = portfolio_instance($instanceid);
 145         if ($broken = portfolio_instance_sanity_check($instance)) {
 146             throw new portfolio_exception($broken[$instance->get('id')], 'portfolio_' . $instance->get('plugin'));
 147         }
 148         $instance->set('user', $USER);
 149     } else {
 150         $instance = null;
 151     }
 152
 153     // we must be passed this from the caller, we cannot start a new export
 154     // without knowing information about what part of moodle we come from.
 155     if (empty($callbackfile) || empty($callbackclass)) {
 156         debugging('no callback file or class');
 157         portfolio_exporter::print_expired_export();
 158     }
 159
 160     // so each place in moodle can pass callback args here
 161     // process the entire request looking for ca_*
 162     // be as lenient as possible while still being secure
 163     // so only accept certain parameter types.
 164     $callbackargs = array();
 165     foreach (array_keys(array_merge($_GET, $_POST)) as $key) {
 166         if (strpos($key, 'ca_') === 0) {
 167             if (!$value =  optional_param($key, false, PARAM_ALPHAEXT)) {
 168                 if (!$value = optional_param($key, false, PARAM_FLOAT)) {
 169                     $value = optional_param($key, false, PARAM_PATH);
 170                 }
 171             }
 172             // strip off ca_ for niceness
 173             $callbackargs[substr($key, 3)] = $value;
 174         }
 175     }
 176     // righto, now we have the callback args set up
 177     // load up the caller file and class and tell it to set up all the data
 178     // it needs
 179     require_once($CFG->dirroot . $callbackfile);
 180     if (!class_exists($callbackclass) || !is_subclass_of($callbackclass, 'portfolio_caller_base')) {
 181         throw new portfolio_caller_exception('callbackclassinvalid', 'portfolio');
 182     }
 183     $caller = new $callbackclass($callbackargs);
 184     $caller->set('user', $USER);
 185     if ($formats = explode(',', $callerformats)) {
 186         $caller->set_formats_from_button($formats);
 187     }
 188     $caller->load_data();
 189     // this must check capabilities and either throw an exception or return false.
 190     if (!$caller->check_permissions()) {
 191         throw new portfolio_caller_exception('nopermissions', 'portfolio', $caller->get_return_url());
 192     }
 193
 194     portfolio_export_pagesetup($PAGE, $caller); // this calls require_login($course) if it can..
 195
 196     // finally! set up the exporter object with the portfolio instance, and caller information elements
 197     $exporter = new portfolio_exporter($instance, $caller, $callbackfile);
 198
 199     // set the export-specific variables, and save.
 200     $exporter->set('user', $USER);
 201     $exporter->save();
 202 }
 203
 204 if (!$exporter->get('instance')) {
 205     // we've just arrived but have no instance
 206     // in this case the exporter object and the caller object have been set up above
 207     // so just make a little form to select the portfolio plugin instance,
 208     // which is the last thing to do before starting the export.
 209     //
 210     // first check to make sure there is actually a point
 211     $options = portfolio_instance_select(
 212         portfolio_instances(),
 213         $exporter->get('caller')->supported_formats(),
 214         get_class($exporter->get('caller')),
 215         $exporter->get('caller')->get_mimetype(),
 216         'instance',
 217         true,
 218         true
 219     );
 220     if (empty($options)) {
 221         throw new portfolio_export_exception($exporter, 'noavailableplugins', 'portfolio');
 222     } else if (count($options) == 1) {
 223         // no point displaying a form, just redirect.
 224         $optionskeys = array_keys($options);
 225         $instance = array_shift($optionskeys);
 226         redirect($CFG->wwwroot . '/portfolio/add.php?id= ' . $exporter->get('id') . '&instance=' . $instance . '&sesskey=' . sesskey());
 227     }
 228     // be very selective about not including this unless we really need to
 229     require_once($CFG->libdir . '/portfolio/forms.php');
 230     $mform = new portfolio_instance_select('', array('id' => $exporter->get('id'), 'caller' => $exporter->get('caller'), 'options' => $options));
 231     if ($mform->is_cancelled()) {
 232         $exporter->cancel_request();
 233     } else if ($fromform = $mform->get_data()){
 234         redirect($CFG->wwwroot . '/portfolio/add.php?instance=' . $fromform->instance . '&amp;id=' . $exporter->get('id'));
 235         exit;
 236     }
 237     else {
 238         $exporter->print_header(get_string('selectplugin', 'portfolio'));
 239         echo $OUTPUT->box_start();
 240         $mform->display();
 241         echo $OUTPUT->box_end();
 242         echo $OUTPUT->footer();
 243         exit;
 244     }
 245 }
 246
 247 // if we haven't been passed &stage= grab it from the exporter.
 248 if (!$stage) {
 249     $stage = $exporter->get('stage');
 250 }
 251
 252 // for places returning control to pass (rather than PORTFOLIO_STAGE_PACKAGE
 253 // which is unstable if they can't get to the constant (eg external system)
 254 $alreadystolen = false;
 255 if ($postcontrol) { // the magic request variable plugins must pass on returning here
 256     try {
 257         // allow it to read whatever gets sent back in the request
 258         // this is useful for plugins that redirect away and back again
 259         // adding a token to the end of the url, for example box.net
 260         $exporter->instance()->post_control($stage, array_merge($_GET, $_POST));
 261     } catch (portfolio_plugin_exception $e) {
 262         portfolio_export_rethrow_exception($exporter, $e);
 263     }
 264     $alreadystolen = true; // remember this so we don't get caught in a steal control loop!
 265 }
 266
 267 // actually do the work now..
 268 $exporter->process_stage($stage, $alreadystolen);
 269
 270