chromium: Add support for ppapi flash and PDF.

This is hardcoded for the dev channel at the moment and we're going to
fetch it along with the main Chromium sources.

Also I'm putting this in default.nix at the moment, because we're going
to tear apart the whole Chromium package into several subparts soon.

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

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

@@ -26,6 +26,8 @@
 , gnomeSupport ? false, gconf ? null
 , gnomeKeyringSupport ? false, libgnome_keyring3 ? null
 , proprietaryCodecs ? true
+, enablePepperFlash ? false
+, enablePepperPDF ? false
 , cupsSupport ? false
 , pulseSupport ? false, pulseaudio ? null
 }:
@@ -151,6 +153,68 @@ let
     binary = "${packageName}_sandbox";
   };
 
+  binaryPlugins = stdenv.mkDerivation {
+    name = "chromium-binary-plugins";
+
+    # XXX: Only temporary and has to be version-specific
+    src = fetchurl {
+      url = "https://dl.google.com/linux/chrome/deb/pool/main/g/"
+          + "google-chrome-unstable/google-chrome-unstable_"
+          + "35.0.1897.2-1_amd64.deb";
+      sha1 = "b68683fc5321d10536e4135c266b14894b7668ed";
+    };
+
+    phases = [ "unpackPhase" "patchPhase" "checkPhase" "installPhase" ];
+    outputs = [ "pdf" "flash" ];
+
+    unpackCmd = ''
+      ensureDir plugins
+      ar p "$src" data.tar.lzma | tar xJ -C plugins --strip-components=4 \
+        ./opt/google/chrome-unstable/PepperFlash \
+        ./opt/google/chrome-unstable/libpdf.so
+    '';
+
+    doCheck = true;
+    checkPhase = ''
+      ! find -iname '*.so' -exec ldd {} + | grep 'not found'
+    '';
+
+    patchPhase = let
+      rpaths = [ stdenv.gcc.gcc ];
+      mkrpath = p: "${makeSearchPath "lib64" p}:${makeSearchPath "lib" p}";
+    in ''
+      for sofile in PepperFlash/libpepflashplayer.so libpdf.so; do
+        chmod +x "$sofile"
+        patchelf --set-rpath "${mkrpath rpaths}" "$sofile"
+      done
+    '';
+
+    installPhase = let
+      pdfName = "Chrome PDF Viewer";
+      pdfDescription = "Portable Document Format";
+      pdfMimeTypes = concatStringsSep ";" [
+        "application/pdf"
+        "application/x-google-chrome-print-preview-pdf"
+      ];
+      pdfInfo = "#${pdfName}#${pdfDescription};${pdfMimeTypes}";
+    in ''
+      install -vD libpdf.so "$pdf/lib/libpdf.so"
+      ensureDir "$pdf/nix-support"
+      echo "--register-pepper-plugins='$pdf/lib/libpdf.so${pdfInfo}'" \
+        > "$pdf/nix-support/chromium-flags"
+
+      flashVersion="$(
+        sed -n -r 's/.*"version": "([^"]+)",.*/\1/p' PepperFlash/manifest.json
+      )"
+
+      install -vD libpepflashplayer.so "$flash/lib/libpepflashplayer.so"
+      ensureDir "$flash/nix-support"
+      echo "--ppapi-flash-path='$flash/lib/libpepflashplayer.so'" \
+           "--ppapi-flash-version=$flashVersion" \
+           > "$flash/nix-support/chromium-flags"
+    '';
+  };
+
   # build paths and release info
   packageName = "chromium";
   buildType = "Release";
@@ -248,7 +312,12 @@ in stdenv.mkDerivation rec {
         chrome ${optionalString (!enableSELinux) "chrome_sandbox"}
   '';
 
-  installPhase = ''
+  installPhase = let
+    enabledPlugins = optional enablePepperFlash binaryPlugins.flash
+                  ++ optional enablePepperPDF   binaryPlugins.pdf;
+    getFlags = plugin: "$(< ${plugin}/nix-support/chromium-flags)";
+    pluginArgs = concatStringsSep " " (map getFlags enabledPlugins);
+  in ''
     ensureDir "${libExecPath}"
     cp -v "${buildPath}/"*.pak "${libExecPath}/"
     ${optionalString (!versionOlder src.version "34.0.0.0") ''
@@ -260,7 +329,8 @@ in stdenv.mkDerivation rec {
     cp -v "${buildPath}/chrome" "${libExecPath}/${packageName}"
 
     mkdir -vp "$out/bin"
-    makeWrapper "${libExecPath}/${packageName}" "$out/bin/${packageName}"
+    makeWrapper "${libExecPath}/${packageName}" "$out/bin/${packageName}" \
+      --add-flags "${pluginArgs}"
 
     mkdir -vp "$out/share/man/man1"
     cp -v "${buildPath}/chrome.1" "$out/share/man/man1/${packageName}.1"