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/*
* Copyright (C) 2020 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.security;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.net.Uri;
import android.os.Parcel;
import android.os.Parcelable;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlSerializer;
import java.io.IOException;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
/**
* The mapping from URI to alias, which determines the alias to use when the user visits a URI.
* This mapping is part of the {@link AppUriAuthenticationPolicy}, which specifies which app this
* mapping should be used for.
*
* @hide
* @see AppUriAuthenticationPolicy
*/
public final class UrisToAliases implements Parcelable {
private static final String KEY_AUTHENTICATION_POLICY_URI_TO_ALIAS =
"authentication_policy_uri_to_alias";
private static final String KEY_AUTHENTICATION_POLICY_URI = "policy_uri";
private static final String KEY_AUTHENTICATION_POLICY_ALIAS = "policy_alias";
/**
* The mappings from URIs to aliases, which will be used for authentication.
*/
@NonNull
private final Map<Uri, String> mUrisToAliases;
public UrisToAliases() {
this.mUrisToAliases = new HashMap<>();
}
private UrisToAliases(@NonNull Map<Uri, String> urisToAliases) {
this.mUrisToAliases = urisToAliases;
}
@NonNull
public static final Creator<UrisToAliases> CREATOR = new Creator<UrisToAliases>() {
@Override
public UrisToAliases createFromParcel(Parcel in) {
Map<Uri, String> urisToAliases = new HashMap<>();
in.readMap(urisToAliases, String.class.getClassLoader());
return new UrisToAliases(urisToAliases);
}
@Override
public UrisToAliases[] newArray(int size) {
return new UrisToAliases[size];
}
};
/**
* Returns the mapping from URIs to aliases.
*/
@NonNull
public Map<Uri, String> getUrisToAliases() {
return Collections.unmodifiableMap(mUrisToAliases);
}
/**
* Adds mapping from an URI to an alias.
*/
public void addUriToAlias(@NonNull Uri uri, @NonNull String alias) {
mUrisToAliases.put(uri, alias);
}
/**
* Restore a previously saved {@link UrisToAliases} from XML.
*/
@Nullable
public static UrisToAliases readFromXml(@NonNull XmlPullParser parser)
throws IOException, XmlPullParserException {
Map<Uri, String> urisToAliases = new HashMap<>();
int outerDepth = parser.getDepth();
int type;
while ((type = parser.next()) != XmlPullParser.END_DOCUMENT
&& (type != XmlPullParser.END_TAG || parser.getDepth() > outerDepth)) {
if (type == XmlPullParser.END_TAG || type == XmlPullParser.TEXT) {
continue;
}
if (!parser.getName().equals(KEY_AUTHENTICATION_POLICY_URI_TO_ALIAS)) {
continue;
}
Uri uri = Uri.parse(parser.getAttributeValue(null, KEY_AUTHENTICATION_POLICY_URI));
String alias = parser.getAttributeValue(null, KEY_AUTHENTICATION_POLICY_ALIAS);
urisToAliases.put(uri, alias);
}
return new UrisToAliases(urisToAliases);
}
/**
* Save the {@link UrisToAliases} to XML.
*/
public void writeToXml(@NonNull XmlSerializer out) throws IOException {
for (Map.Entry<Uri, String> urisToAliases : mUrisToAliases.entrySet()) {
out.startTag(null, KEY_AUTHENTICATION_POLICY_URI_TO_ALIAS);
out.attribute(null, KEY_AUTHENTICATION_POLICY_URI, urisToAliases.getKey().toString());
out.attribute(null, KEY_AUTHENTICATION_POLICY_ALIAS, urisToAliases.getValue());
out.endTag(null, KEY_AUTHENTICATION_POLICY_URI_TO_ALIAS);
}
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(@NonNull Parcel dest, int flags) {
dest.writeMap(mUrisToAliases);
}
}
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