Implement MediaMetadata artwork in content

content/public/common/media_metadata.cc

Index: content/public/common/media_metadata.cc
diff --git a/content/public/common/media_metadata.cc b/content/public/common/media_metadata.cc
index dc3824c25b0cdc82b515387caec50f9ea356f6b7..fa647649faac1c436bbf4147459b0193d07eceef 100644
--- a/content/public/common/media_metadata.cc
+++ b/content/public/common/media_metadata.cc
@@ -4,20 +4,67 @@
 
 #include "content/public/common/media_metadata.h"
 
+#include <algorithm>
+#include <iterator>
+
 namespace content {
 
+namespace {
+
+const size_t kMaxArtworkSrcLength = 4 * 1024;
+// Maximum type length of Artwork, which conforms to RFC 4288
+// (https://tools.ietf.org/html/rfc4288).
+const size_t kMaxArtworkTypeLength = 2 * 127 + 1;
+const size_t kMaxNumberOfArtworkSizes = 10;
+
+}  // anonymous namespace
+
 const size_t MediaMetadata::kMaxIPCStringLength = 4 * 1024;
+const size_t MediaMetadata::kMaxNumberOfArtworkImages = 10;
 
 MediaMetadata::MediaMetadata() = default;
 
 MediaMetadata::~MediaMetadata() = default;
 
+MediaMetadata::MediaMetadata(const MediaMetadata& other) = default;
+
 bool MediaMetadata::operator==(const MediaMetadata& other) const {
-  return title == other.title && artist == other.artist && album == other.album;
+  return title == other.title && artist == other.artist &&
+      album == other.album && artwork == other.artwork;
 }
 
 bool MediaMetadata::operator!=(const MediaMetadata& other) const {
   return !this->operator==(other);
 }
 
+base::Optional<MediaMetadata::Artwork> MediaMetadata::SanitizeArtwork(
+    const MediaMetadata::Artwork& artwork) {
+  if (!artwork.src.is_valid() || !artwork.src.IsStandard() ||
+      (!artwork.src.SchemeIsHTTPOrHTTPS() &&
+       !artwork.src.SchemeIsFile()) ||
+      artwork.src.spec().size() > kMaxArtworkSrcLength) {
+    return base::nullopt;
+  }
+  // Early return if artwork is sane.
+  if (artwork.type.string().size() <= kMaxArtworkTypeLength &&
+      artwork.sizes.size() <= kMaxNumberOfArtworkSizes) {
+    return artwork;
+  }
+
+  Artwork sanitized_artwork;
+  sanitized_artwork.src = artwork.src;
+  sanitized_artwork.type = artwork.type.is_null() ?
+      base::NullableString16() :
+      base::NullableString16(
+          artwork.type.string().substr(0, kMaxArtworkTypeLength),
+          false);
+  for (size_t i = 0;
+       i < std::min(artwork.sizes.size(), kMaxNumberOfArtworkSizes);
+       ++i) {
+    sanitized_artwork.sizes.push_back(artwork.sizes[i]);
+  }
+
+  return sanitized_artwork;
+}
+
 }  // namespace content