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| 1 // Copyright 2015 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 package org.chromium.chrome.browser.externalauth; |
| 6 |
| 7 import android.content.Context; |
| 8 import android.os.Handler; |
| 9 import android.os.Message; |
| 10 import android.os.Messenger; |
| 11 import android.text.TextUtils; |
| 12 |
| 13 import java.util.HashMap; |
| 14 import java.util.Map; |
| 15 |
| 16 /** |
| 17 * Handler class that ignores any messages coming from external caller that does
n't meet the given |
| 18 * authentication requirements. |
| 19 */ |
| 20 public class VerifiedHandler extends Handler { |
| 21 private final int mAuthRequirements; |
| 22 private final String mCallerPackageToMatch; |
| 23 private final Map<Messenger, Boolean> mClientTrustMap = new HashMap<Messenge
r, Boolean>(); |
| 24 private final Context mContext; |
| 25 |
| 26 /** |
| 27 * Basic constructor for verified handler. |
| 28 * @param context The context to use for accessing the package manager. |
| 29 * @param authRequirements The requirements for authenticating the caller ap
plication. |
| 30 */ |
| 31 public VerifiedHandler(Context context, int authRequirements) { |
| 32 this(context, authRequirements, ""); |
| 33 } |
| 34 |
| 35 /** |
| 36 * Constructor with package name requirement. |
| 37 * @param context The context to use for accessing the package manager. |
| 38 * @param authRequirements The requirements for authenticating the caller ap
plication. |
| 39 * @param callerPackageToMatch The package name to match to. |
| 40 */ |
| 41 public VerifiedHandler(Context context, int authRequirements, |
| 42 String callerPackageToMatch) { |
| 43 mContext = context; |
| 44 mAuthRequirements = authRequirements; |
| 45 mCallerPackageToMatch = callerPackageToMatch; |
| 46 } |
| 47 |
| 48 @Override |
| 49 public boolean sendMessageAtTime(Message msg, long uptimeMillis) { |
| 50 Messenger client = msg.replyTo; |
| 51 if (!mClientTrustMap.containsKey(client)) mClientTrustMap.put(client, ch
eckCallerIsValid()); |
| 52 if (!mClientTrustMap.get(client)) return false; |
| 53 |
| 54 return super.sendMessageAtTime(msg, uptimeMillis); |
| 55 } |
| 56 |
| 57 /** |
| 58 * @return Whether the calling application is valid given the requirements |
| 59 * set during construction. |
| 60 */ |
| 61 public boolean checkCallerIsValid() { |
| 62 if (TextUtils.isEmpty(mCallerPackageToMatch)) { |
| 63 return ExternalAuthUtils.getInstance().isCallerValid(mContext, mAuth
Requirements); |
| 64 } else { |
| 65 return ExternalAuthUtils.getInstance().isCallerValidForPackage( |
| 66 mContext, mAuthRequirements, mCallerPackageToMatch); |
| 67 } |
| 68 } |
| 69 } |
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