| /* |
| * Copyright (C) 2015 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.nfc.cardemulation; |
| |
| import android.compat.annotation.UnsupportedAppUsage; |
| import android.os.Parcel; |
| import android.os.Parcelable; |
| import android.util.Log; |
| |
| import org.xmlpull.v1.XmlPullParser; |
| import org.xmlpull.v1.XmlPullParserException; |
| import org.xmlpull.v1.XmlSerializer; |
| |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * The AidGroup class represents a group of Application Identifiers (AIDs). |
| * |
| * <p>The format of AIDs is defined in the ISO/IEC 7816-4 specification. This class |
| * requires the AIDs to be input as a hexadecimal string, with an even amount of |
| * hexadecimal characters, e.g. "F014811481". |
| * |
| * @hide |
| */ |
| public final class AidGroup implements Parcelable { |
| /** |
| * The maximum number of AIDs that can be present in any one group. |
| */ |
| public static final int MAX_NUM_AIDS = 256; |
| |
| static final String TAG = "AidGroup"; |
| |
| @UnsupportedAppUsage |
| final List<String> aids; |
| @UnsupportedAppUsage |
| final String category; |
| @UnsupportedAppUsage |
| final String description; |
| |
| /** |
| * Creates a new AidGroup object. |
| * |
| * @param aids The list of AIDs present in the group |
| * @param category The category of this group, e.g. {@link CardEmulation#CATEGORY_PAYMENT} |
| */ |
| public AidGroup(List<String> aids, String category) { |
| if (aids == null || aids.size() == 0) { |
| throw new IllegalArgumentException("No AIDS in AID group."); |
| } |
| if (aids.size() > MAX_NUM_AIDS) { |
| throw new IllegalArgumentException("Too many AIDs in AID group."); |
| } |
| for (String aid : aids) { |
| if (!CardEmulation.isValidAid(aid)) { |
| throw new IllegalArgumentException("AID " + aid + " is not a valid AID."); |
| } |
| } |
| if (isValidCategory(category)) { |
| this.category = category; |
| } else { |
| this.category = CardEmulation.CATEGORY_OTHER; |
| } |
| this.aids = new ArrayList<String>(aids.size()); |
| for (String aid : aids) { |
| this.aids.add(aid.toUpperCase()); |
| } |
| this.description = null; |
| } |
| |
| @UnsupportedAppUsage |
| AidGroup(String category, String description) { |
| this.aids = new ArrayList<String>(); |
| this.category = category; |
| this.description = description; |
| } |
| |
| /** |
| * @return the category of this AID group |
| */ |
| @UnsupportedAppUsage |
| public String getCategory() { |
| return category; |
| } |
| |
| /** |
| * @return the list of AIDs in this group |
| */ |
| @UnsupportedAppUsage |
| public List<String> getAids() { |
| return aids; |
| } |
| |
| @Override |
| public String toString() { |
| StringBuilder out = new StringBuilder("Category: " + category + |
| ", AIDs:"); |
| for (String aid : aids) { |
| out.append(aid); |
| out.append(", "); |
| } |
| return out.toString(); |
| } |
| |
| @Override |
| public int describeContents() { |
| return 0; |
| } |
| |
| @Override |
| public void writeToParcel(Parcel dest, int flags) { |
| dest.writeString(category); |
| dest.writeInt(aids.size()); |
| if (aids.size() > 0) { |
| dest.writeStringList(aids); |
| } |
| } |
| |
| @UnsupportedAppUsage |
| public static final @android.annotation.NonNull Parcelable.Creator<AidGroup> CREATOR = |
| new Parcelable.Creator<AidGroup>() { |
| |
| @Override |
| public AidGroup createFromParcel(Parcel source) { |
| String category = source.readString(); |
| int listSize = source.readInt(); |
| ArrayList<String> aidList = new ArrayList<String>(); |
| if (listSize > 0) { |
| source.readStringList(aidList); |
| } |
| return new AidGroup(aidList, category); |
| } |
| |
| @Override |
| public AidGroup[] newArray(int size) { |
| return new AidGroup[size]; |
| } |
| }; |
| |
| @UnsupportedAppUsage |
| static public AidGroup createFromXml(XmlPullParser parser) throws XmlPullParserException, IOException { |
| String category = null; |
| ArrayList<String> aids = new ArrayList<String>(); |
| AidGroup group = null; |
| boolean inGroup = false; |
| |
| int eventType = parser.getEventType(); |
| int minDepth = parser.getDepth(); |
| while (eventType != XmlPullParser.END_DOCUMENT && parser.getDepth() >= minDepth) { |
| String tagName = parser.getName(); |
| if (eventType == XmlPullParser.START_TAG) { |
| if (tagName.equals("aid")) { |
| if (inGroup) { |
| String aid = parser.getAttributeValue(null, "value"); |
| if (aid != null) { |
| aids.add(aid.toUpperCase()); |
| } |
| } else { |
| Log.d(TAG, "Ignoring <aid> tag while not in group"); |
| } |
| } else if (tagName.equals("aid-group")) { |
| category = parser.getAttributeValue(null, "category"); |
| if (category == null) { |
| Log.e(TAG, "<aid-group> tag without valid category"); |
| return null; |
| } |
| inGroup = true; |
| } else { |
| Log.d(TAG, "Ignoring unexpected tag: " + tagName); |
| } |
| } else if (eventType == XmlPullParser.END_TAG) { |
| if (tagName.equals("aid-group") && inGroup && aids.size() > 0) { |
| group = new AidGroup(aids, category); |
| break; |
| } |
| } |
| eventType = parser.next(); |
| } |
| return group; |
| } |
| |
| @UnsupportedAppUsage |
| public void writeAsXml(XmlSerializer out) throws IOException { |
| out.startTag(null, "aid-group"); |
| out.attribute(null, "category", category); |
| for (String aid : aids) { |
| out.startTag(null, "aid"); |
| out.attribute(null, "value", aid); |
| out.endTag(null, "aid"); |
| } |
| out.endTag(null, "aid-group"); |
| } |
| |
| static boolean isValidCategory(String category) { |
| return CardEmulation.CATEGORY_PAYMENT.equals(category) || |
| CardEmulation.CATEGORY_OTHER.equals(category); |
| } |
| } |