/*
* Copyright (C) 2012 The K-9 Dog Walkers
* Copyright (C) 2011 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.fsck.k9.mail.store.imap;
import java.util.ArrayList;
import java.util.List;
import timber.log.Timber;
/**
* Utility methods for use with IMAP.
*/
class ImapUtility {
/**
* Gets all of the values in a sequence set per RFC 3501.
*
* <p>
* Any ranges are expanded into a list of individual numbers.
* </p>
*
* <pre>
* sequence-number = nz-number / "*"
* sequence-range = sequence-number ":" sequence-number
* sequence-set = (sequence-number / sequence-range) *("," sequence-set)
* </pre>
*
* @param set
* The sequence set string as received by the server.
*
* @return The list of IDs as strings in this sequence set. If the set is invalid, an empty
* list is returned.
*/
public static List<String> getImapSequenceValues(String set) {
List<String> list = new ArrayList<String>();
if (set != null) {
String[] setItems = set.split(",");
for (String item : setItems) {
if (item.indexOf(':') == -1) {
// simple item
if (isNumberValid(item)) {
list.add(item);
}
} else {
// range
list.addAll(getImapRangeValues(item));
}
}
}
return list;
}
/**
* Expand the given number range into a list of individual numbers.
*
* <pre>
* sequence-number = nz-number / "*"
* sequence-range = sequence-number ":" sequence-number
* sequence-set = (sequence-number / sequence-range) *("," sequence-set)
* </pre>
*
* @param range
* The range string as received by the server.
*
* @return The list of IDs as strings in this range. If the range is not valid, an empty list
* is returned.
*/
public static List<String> getImapRangeValues(String range) {
List<String> list = new ArrayList<String>();
try {
if (range != null) {
int colonPos = range.indexOf(':');
if (colonPos > 0) {
long first = Long.parseLong(range.substring(0, colonPos));
long second = Long.parseLong(range.substring(colonPos + 1));
if (is32bitValue(first) && is32bitValue(second)) {
if (first < second) {
for (long i = first; i <= second; i++) {
list.add(Long.toString(i));
}
} else {
for (long i = first; i >= second; i--) {
list.add(Long.toString(i));
}
}
} else {
Timber.d("Invalid range: %s", range);
}
}
}
} catch (NumberFormatException e) {
Timber.d(e, "Invalid range value: %s", range);
}
return list;
}
private static boolean isNumberValid(String number) {
try {
long value = Long.parseLong(number);
if (is32bitValue(value)) {
return true;
}
} catch (NumberFormatException e) {
// do nothing
}
Timber.d("Invalid UID value: %s", number);
return false;
}
private static boolean is32bitValue(long value) {
return ((value & ~0xFFFFFFFFL) == 0L);
}
/**
* Encode a string to be able to use it in an IMAP command.
*
* "A quoted string is a sequence of zero or more 7-bit characters,
* excluding CR and LF, with double quote (<">) characters at each
* end." - Section 4.3, RFC 3501
*
* Double quotes and backslash are escaped by prepending a backslash.
*
* @param str
* The input string (only 7-bit characters allowed).
*
* @return The string encoded as quoted (IMAP) string.
*/
public static String encodeString(String str) {
return "\"" + str.replace("\\", "\\\\").replace("\"", "\\\"") + "\"";
}
public static ImapResponse getLastResponse(List<ImapResponse> responses) {
int lastIndex = responses.size() - 1;
return responses.get(lastIndex);
}
}