Add PAC File support for proxy configuration

PAC (Proxy auto-config) files contain a single javascript function,
FindProxyForURL(url, host).  It gets called to determine what proxy should be
used for a specific request.

This adds PAC support to the system.  The ProxyProperties has been modified
to hold the PAC file when one is present.  The Proxy method
setHttpProxySystemProperty has been modified to insert a PacProxySelector
as the default ProxySelector when it is required.  This new ProxySelector
makes calls to the ConnectivityService to parse the PAC file.

The ConnectivityService and the WifiConfigStore have been modified to support
saving the extra PAC file data.

The ConnectivityService now has a class attached (PacProxyNative) that
interfaces to the native calls for PAC files.  The parsing of the PAC file
is handled by libpac (which is being added to external/) which utilizes
libv8 to parse the javascript.

As a fallback to applications that don't use the java ProxySelector,  the proxy
is setup to point to a local proxy server that will handle the pac parsing.

bug:10182711
Change-Id: I5eb8df893c632fd3e1b732385cb7720ad646f401

3 files changed, 9 insertions, 5 deletions

diff --git a/core/java/android/app/ActivityThread.java b/core/java/android/app/ActivityThread.java
index d9f9d61..5300eca 100644
--- a/core/java/android/app/ActivityThread.java
+++ b/core/java/android/app/ActivityThread.java
@@ -793,8 +793,8 @@ public final class ActivityThread {
             InetAddress.clearDnsCache();
         }
 
-        public void setHttpProxy(String host, String port, String exclList) {
-            Proxy.setHttpProxySystemProperty(host, port, exclList);
+        public void setHttpProxy(String host, String port, String exclList, String pacFileUrl) {
+            Proxy.setHttpProxySystemProperty(host, port, exclList, pacFileUrl);
         }
 
         public void processInBackground() {
diff --git a/core/java/android/app/ApplicationThreadNative.java b/core/java/android/app/ApplicationThreadNative.java
index 6f18e84..1465de2 100644
--- a/core/java/android/app/ApplicationThreadNative.java
+++ b/core/java/android/app/ApplicationThreadNative.java
@@ -338,7 +338,8 @@ public abstract class ApplicationThreadNative extends Binder
             final String proxy = data.readString();
             final String port = data.readString();
             final String exclList = data.readString();
-            setHttpProxy(proxy, port, exclList);
+            final String pacFileUrl = data.readString();
+            setHttpProxy(proxy, port, exclList, pacFileUrl);
             return true;
         }
 
@@ -1001,12 +1002,14 @@ class ApplicationThreadProxy implements IApplicationThread {
         data.recycle();
     }
 
-    public void setHttpProxy(String proxy, String port, String exclList) throws RemoteException {
+    public void setHttpProxy(String proxy, String port, String exclList,
+            String pacFileUrl) throws RemoteException {
         Parcel data = Parcel.obtain();
         data.writeInterfaceToken(IApplicationThread.descriptor);
         data.writeString(proxy);
         data.writeString(port);
         data.writeString(exclList);
+        data.writeString(pacFileUrl);
         mRemote.transact(SET_HTTP_PROXY_TRANSACTION, data, null, IBinder.FLAG_ONEWAY);
         data.recycle();
     }
diff --git a/core/java/android/app/IApplicationThread.java b/core/java/android/app/IApplicationThread.java
index 8e882df..61c499a 100644
--- a/core/java/android/app/IApplicationThread.java
+++ b/core/java/android/app/IApplicationThread.java
@@ -101,7 +101,8 @@ public interface IApplicationThread extends IInterface {
     void scheduleConfigurationChanged(Configuration config) throws RemoteException;
     void updateTimeZone() throws RemoteException;
     void clearDnsCache() throws RemoteException;
-    void setHttpProxy(String proxy, String port, String exclList) throws RemoteException;
+    void setHttpProxy(String proxy, String port, String exclList,
+            String pacFileUrl) throws RemoteException;
     void processInBackground() throws RemoteException;
     void dumpService(FileDescriptor fd, IBinder servicetoken, String[] args)
             throws RemoteException;