From c15bb5ad72b1a9692682cf88318a70b7e650d34a Mon Sep 17 00:00:00 2001
From: Simounet <contact@simounet.net>
Date: Thu, 31 May 2018 23:42:06 +0200
Subject: Fix srcset attribute on images downloaded

---
 src/Wallabag/CoreBundle/Helper/DownloadImages.php  | 36 ++++++++++++++++++++--
 .../CoreBundle/Helper/DownloadImagesTest.php       | 21 +++++++++++++
 2 files changed, 54 insertions(+), 3 deletions(-)

diff --git a/src/Wallabag/CoreBundle/Helper/DownloadImages.php b/src/Wallabag/CoreBundle/Helper/DownloadImages.php
index 252ba57c..9c9452dd 100644
--- a/src/Wallabag/CoreBundle/Helper/DownloadImages.php
+++ b/src/Wallabag/CoreBundle/Helper/DownloadImages.php
@@ -42,14 +42,17 @@ class DownloadImages
     public function processHtml($entryId, $html, $url)
     {
         $crawler = new Crawler($html);
-        $result = $crawler
-            ->filterXpath('//img')
+        $imagesCrawler = $crawler
+            ->filterXpath('//img');
+        $imagesUrls = $imagesCrawler
             ->extract(['src']);
+        $imagesSrcsetUrls = $this->getSrcsetUrls($imagesCrawler);
+        $imagesUrls = array_unique(array_merge($imagesUrls, $imagesSrcsetUrls));
 
         $relativePath = $this->getRelativePath($entryId);
 
         // download and save the image to the folder
-        foreach ($result as $image) {
+        foreach ($imagesUrls as $image) {
             $imagePath = $this->processSingleImage($entryId, $image, $url, $relativePath);
 
             if (false === $imagePath) {
@@ -171,6 +174,33 @@ class DownloadImages
         @rmdir($folderPath);
     }
 
+    /**
+     * Get images urls from the srcset image attribute.
+     *
+     * @param Crawler $imagesCrawler
+     *
+     * @return array An array of urls
+     */
+    protected function getSrcsetUrls(Crawler $imagesCrawler)
+    {
+        $urls = [];
+        $iterator = $imagesCrawler
+            ->getIterator();
+        while ($iterator->valid()) {
+            $srcsetAttribute = $iterator->current()->getAttribute('srcset');
+            if ('' !== $srcsetAttribute) {
+                $srcset = array_map('trim', explode(',', $srcsetAttribute));
+                $srcsetUrls = array_map(function ($src) {
+                    return explode(' ', $src)[0];
+                }, $srcset);
+                $urls = array_merge($srcsetUrls, $urls);
+            }
+            $iterator->next();
+        }
+
+        return $urls;
+    }
+
     /**
      * Setup base folder where all images are going to be saved.
      */
diff --git a/tests/Wallabag/CoreBundle/Helper/DownloadImagesTest.php b/tests/Wallabag/CoreBundle/Helper/DownloadImagesTest.php
index 0e1d296b..51ab1bcd 100644
--- a/tests/Wallabag/CoreBundle/Helper/DownloadImagesTest.php
+++ b/tests/Wallabag/CoreBundle/Helper/DownloadImagesTest.php
@@ -183,4 +183,25 @@ class DownloadImagesTest extends TestCase
         $this->assertContains('http://wallabag.io/assets/images/9/b/9b0ead26/', $res, 'Content-Type was empty but data is ok for an image');
         $this->assertContains('DownloadImages: Checking extension (alternative)', $logHandler->getRecords()[3]['message']);
     }
+
+    public function testProcessImageWithSrcset()
+    {
+        $client = new Client();
+
+        $mock = new Mock([
+            new Response(200, ['content-type' => 'image/jpeg'], Stream::factory(file_get_contents(__DIR__ . '/../fixtures/image-no-content-type.jpg'))),
+            new Response(200, ['content-type' => 'image/jpeg'], Stream::factory(file_get_contents(__DIR__ . '/../fixtures/image-no-content-type.jpg'))),
+            new Response(200, ['content-type' => 'image/jpeg'], Stream::factory(file_get_contents(__DIR__ . '/../fixtures/image-no-content-type.jpg'))),
+        ]);
+
+        $client->getEmitter()->attach($mock);
+
+        $logHandler = new TestHandler();
+        $logger = new Logger('test', [$logHandler]);
+
+        $download = new DownloadImages($client, sys_get_temp_dir() . '/wallabag_test', 'http://wallabag.io/', $logger);
+        $res = $download->processHtml(123, '<p><img class="alignnone wp-image-1153" src="http://piketty.blog.lemonde.fr/files/2017/10/F1FR-530x375.jpg" alt="" width="628" height="444" srcset="http://piketty.blog.lemonde.fr/files/2017/10/F1FR-530x375.jpg 530w, http://piketty.blog.lemonde.fr/files/2017/10/F1FR-768x543.jpg 768w, http://piketty.blog.lemonde.fr/files/2017/10/F1FR-900x636.jpg 900w" sizes="(max-width: 628px) 100vw, 628px" /></p>', 'http://piketty.blog.lemonde.fr/2017/10/12/budget-2018-la-jeunesse-sacrifiee/');
+
+        $this->assertNotContains('http://piketty.blog.lemonde.fr/', $res, 'Image srcset attribute were not replaced');
+    }
 }
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