MDL-62403 portfolio: create directories for google drive export

I've modified the Google Drive portfolio export so that it creates a
root directory in Drive for all of the files in the export. This allows
each export to be contained from each other to help with clashing file
names.

Additionally, the paths for the exported files will now be created in
Drive so that exported files are in the correct directory structure.
This is important for forum posts exports which assume a certain
directory structure in the export.

diff --git a/portfolio/googledocs/lib.php b/portfolio/googledocs/lib.php
index 04733dd..66fa8ec 100644 (file)
--- a/portfolio/googledocs/lib.php
+++ b/portfolio/googledocs/lib.php
@@ -75,18 +75,66 @@ class portfolio_plugin_googledocs extends portfolio_plugin_push_base {
             throw new portfolio_plugin_exception('noauthtoken', 'portfolio_googledocs');
         }
 
+        // Create a parent directory for the export to Google Drive so that all files from the
+        // same export can be contained in one place for easy downloading.
+        $now = time();
+        $exportdirectoryname = $this->exporter->get('caller')->display_name();
+        $exportdirectoryname = strtolower(join('-', explode(' ', $exportdirectoryname)));
+        $exportdirectoryname = "/portfolio-export-{$exportdirectoryname}-{$now}";
+        $directoryids = [];
+
         foreach ($this->exporter->get_tempfiles() as $file) {
+            $filepath = $exportdirectoryname . $file->get_filepath();
+            $directories = array_filter(explode('/', $filepath), function($part) {
+                return !empty($part);
+            });
+
+            // Track how deep into the directory structure we are. This is the key
+            // we'll use to keep track of previously created directory ids.
+            $path = '/';
+            // Track the parent directory so that we can look up it's id for creating
+            // subdirectories in Google Drive.
+            $parentpath = null;
+
+            // Create each of the directories in Google Drive that we need.
+            foreach ($directories as $directory) {
+                // Update the current path for this file.
+                $path .= "${directory}/";
+
+                if (!isset($directoryids[$path])) {
+                    // This directory hasn't been created yet so let's go ahead and create it.
+                    $parents = !is_null($parentpath) ? [$directoryids[$parentpath]] : [];
+                    try {
+                        $filemetadata = new Google_Service_Drive_DriveFile([
+                            'title' => $directory,
+                            'mimeType' => 'application/vnd.google-apps.folder',
+                            'parents' => $parents
+                        ]);
+
+                        $drivefile = $this->service->files->insert($filemetadata, ['fields' => 'id']);
+                        $directoryids[$path] = ['id' => $drivefile->id];
+                    } catch (Exception $e) {
+                        throw new portfolio_plugin_exception('sendfailed', 'portfolio_gdocs', $directory);
+                    }
+                }
+
+                $parentpath = $path;
+            }
+
             try {
                 // Create drivefile object and fill it with data.
                 $drivefile = new Google_Service_Drive_DriveFile();
                 $drivefile->setTitle($file->get_filename());
                 $drivefile->setMimeType($file->get_mimetype());
+                // Add the parent directory id to make sure the file gets created in the correct
+                // directory in Google Drive.
+                $drivefile->setParents([$directoryids[$filepath]]);
 
                 $filecontent = $file->get_content();
-                $createdfile = $this->service->files->insert($drivefile,
-                                                            array('data' => $filecontent,
-                                                                  'mimeType' => $file->get_mimetype(),
-                                                                  'uploadType' => 'multipart'));
+                $this->service->files->insert($drivefile,
+                                              array('data' => $filecontent,
+                                                    'mimeType' => $file->get_mimetype(),
+                                                    'uploadType' => 'multipart'));
             } catch ( Exception $e ) {
                 throw new portfolio_plugin_exception('sendfailed', 'portfolio_gdocs', $file->get_filename());
             }