Use the article domain as author for export files

When exporting an entry, use the domain name as author name for epub,
mobi and pdf formats, instead of 'wallabag'.
Change the author from array to string, because for now, there is always
only one author.

src/Wallabag/ApiBundle/Controller/EntryRestController.php

@@ -180,6 +180,7 @@ class EntryRestController extends WallabagRestController
         return $this->get('wallabag_core.helper.entries_export')
             ->setEntries($entry)
             ->updateTitle('entry')
+            ->updateAuthor('entry')
             ->exportAs($request->attributes->get('_format'));
     }
 

src/Wallabag/CoreBundle/Command/ExportCommand.php

@@ -56,6 +56,7 @@ class ExportCommand extends ContainerAwareCommand
             $data = $this->getContainer()->get('wallabag_core.helper.entries_export')
                 ->setEntries($entries)
                 ->updateTitle('All')
+                ->updateAuthor('All')
                 ->exportJsonData();
             file_put_contents($filePath, $data);
         } catch (\InvalidArgumentException $e) {

src/Wallabag/CoreBundle/Controller/ExportController.php

@@ -33,6 +33,7 @@ class ExportController extends Controller
             return $this->get('wallabag_core.helper.entries_export')
                 ->setEntries($entry)
                 ->updateTitle('entry')
+                ->updateAuthor('entry')
                 ->exportAs($format);
         } catch (\InvalidArgumentException $e) {
             throw new NotFoundHttpException($e->getMessage());
@@ -76,6 +77,7 @@ class ExportController extends Controller
             return $this->get('wallabag_core.helper.entries_export')
                 ->setEntries($entries)
                 ->updateTitle($method)
+                ->updateAuthor($method)
                 ->exportAs($format);
         } catch (\InvalidArgumentException $e) {
             throw new NotFoundHttpException($e->getMessage());

src/Wallabag/CoreBundle/Helper/EntriesExport.php

@@ -18,7 +18,7 @@ class EntriesExport
     private $logoPath;
     private $title = '';
     private $entries = [];
-    private $authors = ['wallabag'];
+    private $author = 'wallabag';
     private $language = '';
     private $footerTemplate = '<div style="text-align:center;">
         <p>Produced by wallabag with %EXPORT_METHOD%</p>
@@ -72,6 +72,24 @@ class EntriesExport
         return $this;
     }
 
+    /**
+     * Sets the author for just one entry.
+     *
+     * @param string $method Method to get articles
+     *
+     * @return EntriesExport
+     */
+    public function updateAuthor($method)
+    {
+        $this->author = $method.' authors';
+
+        if ('entry' === $method) {
+            $this->author = $this->entries[0]->getDomainName();
+        }
+
+        return $this;
+    }
+
     /**
      * Sets the output format.
      *
@@ -128,9 +146,7 @@ class EntriesExport
         $book->setLanguage($this->language);
         $book->setDescription('Some articles saved on my wallabag');
 
-        foreach ($this->authors as $author) {
-            $book->setAuthor($author, $author);
-        }
+        $book->setAuthor($this->author, $this->author);
 
         // I hope this is a non existant address :)
         $book->setPublisher('wallabag', 'wallabag');
@@ -196,7 +212,7 @@ class EntriesExport
          * Book metadata
          */
         $content->set('title', $this->title);
-        $content->set('author', implode($this->authors));
+        $content->set('author', $this->author);
         $content->set('subject', $this->title);
 
         /*
@@ -247,7 +263,7 @@ class EntriesExport
          * Book metadata
          */
         $pdf->SetCreator(PDF_CREATOR);
-        $pdf->SetAuthor('wallabag');
+        $pdf->SetAuthor($this->author);
         $pdf->SetTitle($this->title);
         $pdf->SetSubject('Articles via wallabag');
         $pdf->SetKeywords('wallabag');