chromium: Bring back pepper flash from Adobe

So far we had the bundled Flash player plugin that came with Chrome, but
since version 54 the Chrome package doesn't include PPAPI Flash anymore.

Instead we're going to download the PPAPI Flash plugin directly from
Adobe and try to use them for all release channels of Chromium.

Of course it would be nice if we'd have an updater for it but for now
it's important that we don't break things for people who are currently
forced to use Flash.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>

pkgs/applications/networking/browsers/chromium/default.nix

@@ -28,7 +28,7 @@ let
     browser = callPackage ./browser.nix { inherit channel; };
 
     plugins = callPackage ./plugins.nix {
-      inherit enableWideVine;
+      inherit enablePepperFlash enableWideVine;
     };
   };
 

pkgs/applications/networking/browsers/chromium/plugins.nix

@@ -1,5 +1,7 @@
 { stdenv
 , jshon
+, fetchzip
+, enablePepperFlash ? false
 , enableWideVine ? false
 
 , upstream-info
@@ -8,6 +10,8 @@
 with stdenv.lib;
 
 let
+  mkrpath = p: "${makeSearchPathOutput "lib" "lib64" p}:${makeLibraryPath p}";
+
   # Generate a shell fragment that emits flags appended to the
   # final makeWrapper call for wrapping the browser's main binary.
   #
@@ -59,16 +63,13 @@ let
       ! find -iname '*.so' -exec ldd {} + | grep 'not found'
     '';
 
-    patchPhase = let
-      rpaths = [ stdenv.cc.cc ];
-      mkrpath = p: "${makeSearchPathOutput "lib" "lib64" p}:${makeLibraryPath p}";
-    in ''
+    patchPhase = ''
       for sofile in libwidevinecdm.so libwidevinecdmadapter.so; do
         chmod +x "$sofile"
-        patchelf --set-rpath "${mkrpath rpaths}" "$sofile"
+        patchelf --set-rpath "${mkrpath [ stdenv.cc.cc ]}" "$sofile"
       done
 
-      patchelf --set-rpath "$out/lib:${mkrpath rpaths}" \
+      patchelf --set-rpath "$out/lib:${mkrpath [ stdenv.cc.cc ]}" \
         libwidevinecdmadapter.so
     '';
 
@@ -90,6 +91,48 @@ let
       }}
     '';
   };
+
+  flash = stdenv.mkDerivation rec {
+    name = "flashplayer-ppapi-${version}";
+    version = "23.0.0.205";
+
+    src = fetchzip {
+      url = "https://fpdownload.adobe.com/pub/flashplayer/pdc/"
+          + "${version}/flash_player_ppapi_linux.x86_64.tar.gz";
+      sha256 = "0gj5d8475qcplm3iqs3hkq0i6qkmbhci1zp3ljnhafc6xz0avyhj";
+      stripRoot = false;
+    };
+
+    patchPhase = ''
+      chmod +x libpepflashplayer.so
+      patchelf --set-rpath "${mkrpath [ stdenv.cc.cc ]}" libpepflashplayer.so
+    '';
+
+    doCheck = true;
+    checkPhase = ''
+      ! find -iname '*.so' -exec ldd {} + | grep 'not found'
+    '';
+
+    installPhase = ''
+      flashVersion="$(
+        "${jshon}/bin/jshon" -F manifest.json -e version -u
+      )"
+
+      install -vD libpepflashplayer.so "$out/lib/libpepflashplayer.so"
+
+      ${mkPluginInfo {
+        allowedVars = [ "out" "flashVersion" ];
+        flags = [
+          "--ppapi-flash-path=@out@/lib/libpepflashplayer.so"
+          "--ppapi-flash-version=@flashVersion@"
+        ];
+      }}
+    '';
+
+    dontStrip = true;
+  };
+
 in {
-  enabled = optional enableWideVine widevine;
+  enabled = optional enableWideVine widevine
+         ++ optional enablePepperFlash flash;
 }