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/*
* Copyright 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 com.android.car.calendar.common;
import static com.google.common.base.Verify.verifyNotNull;
import android.net.Uri;
import android.telephony.PhoneNumberUtils;
import android.telephony.TelephonyManager;
import com.android.car.calendar.common.Dialer.NumberAndAccess;
import com.google.common.base.Strings;
import com.google.common.collect.ImmutableList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.annotation.Nullable;
/** Utilities to manipulate the description of a calendar event which may contain meta-data. */
public class EventDescriptions {
// Requires a phone number to include only numbers, spaces and dash, optionally a leading "+".
// The number must be at least 6 characters and can contain " " or "-" but end with a digit.
// The access code must be at least 3 characters.
// The number and the access to include "pin" or "code" between the numbers.
private static final Pattern PHONE_PIN_PATTERN =
Pattern.compile(
"(\\+?[\\d -]{6,}\\d)(?:.*\\b(?:PIN|code)\\b.*?([\\d,;#*]{3,}))?",
Pattern.CASE_INSENSITIVE);
// Matches numbers in the encoded format "<tel: ... >".
private static final Pattern TEL_PIN_PATTERN =
Pattern.compile("<tel:(\\+?[\\d -]{6,})([\\d,;#*]{3,})?>");
// Ensure numbers are over 5 digits to reduce false positives.
private static final int MIN_DIGITS = 5;
private final String mCountryIso;
public EventDescriptions(Locale locale, TelephonyManager telephonyManager) {
String networkCountryIso = telephonyManager.getNetworkCountryIso().toUpperCase();
if (!Strings.isNullOrEmpty(networkCountryIso)) {
mCountryIso = networkCountryIso;
} else {
mCountryIso = locale.getCountry();
}
}
/** Find conference call data embedded in the description. */
public List<NumberAndAccess> extractNumberAndPins(String descriptionText) {
String decoded = Uri.decode(descriptionText);
// Use a map keyed by number to act like a set and only add a single number.
Map<String, NumberAndAccess> results = new LinkedHashMap<>();
addMatchedNumbers(decoded, results, PHONE_PIN_PATTERN);
// Add the most restrictive precise format last to replace others with the same number.
addMatchedNumbers(decoded, results, TEL_PIN_PATTERN);
// Reverse order so the most precise format is first.
return ImmutableList.copyOf(results.values()).reverse();
}
private void addMatchedNumbers(
String decoded, Map<String, NumberAndAccess> results, Pattern phonePinPattern) {
Matcher phoneFormatMatcher = phonePinPattern.matcher(decoded);
while (phoneFormatMatcher.find()) {
NumberAndAccess numberAndAccess = validNumberAndAccess(phoneFormatMatcher);
if (numberAndAccess != null) {
results.put(numberAndAccess.getNumber(), numberAndAccess);
}
}
}
@Nullable
private NumberAndAccess validNumberAndAccess(Matcher phoneFormatMatcher) {
String number = verifyNotNull(phoneFormatMatcher.group(1));
String access = phoneFormatMatcher.group(2);
// Ensure that there are a minimum number of digits to reduce false positives.
String onlyDigits = number.replaceAll("\\D", "");
if (onlyDigits.length() < MIN_DIGITS) {
return null;
}
// Keep local numbers in local format which the dialer can make more sense of.
String formatted = PhoneNumberUtils.formatNumber(number, mCountryIso);
if (formatted == null) {
return null;
}
return new NumberAndAccess(formatted, access);
}
}
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