okhttp3.internal.Util Maven / Gradle / Ivy
/*
* Copyright (C) 2012 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 okhttp3.internal;
import java.io.Closeable;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.net.IDN;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Locale;
import java.util.TimeZone;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.TimeUnit;
import java.util.regex.Pattern;
import okhttp3.HttpUrl;
import okhttp3.RequestBody;
import okhttp3.ResponseBody;
import okio.Buffer;
import okio.BufferedSource;
import okio.ByteString;
import okio.Source;
/** Junk drawer of utility methods. */
public final class Util {
public static final byte[] EMPTY_BYTE_ARRAY = new byte[0];
public static final String[] EMPTY_STRING_ARRAY = new String[0];
public static final ResponseBody EMPTY_RESPONSE = ResponseBody.create(null, EMPTY_BYTE_ARRAY);
public static final RequestBody EMPTY_REQUEST = RequestBody.create(null, EMPTY_BYTE_ARRAY);
private static final ByteString UTF_8_BOM = ByteString.decodeHex("efbbbf");
private static final ByteString UTF_16_BE_BOM = ByteString.decodeHex("feff");
private static final ByteString UTF_16_LE_BOM = ByteString.decodeHex("fffe");
private static final ByteString UTF_32_BE_BOM = ByteString.decodeHex("0000ffff");
private static final ByteString UTF_32_LE_BOM = ByteString.decodeHex("ffff0000");
public static final Charset UTF_8 = Charset.forName("UTF-8");
private static final Charset UTF_16_BE = Charset.forName("UTF-16BE");
private static final Charset UTF_16_LE = Charset.forName("UTF-16LE");
private static final Charset UTF_32_BE = Charset.forName("UTF-32BE");
private static final Charset UTF_32_LE = Charset.forName("UTF-32LE");
/** GMT and UTC are equivalent for our purposes. */
public static final TimeZone UTC = TimeZone.getTimeZone("GMT");
public static final Comparator NATURAL_ORDER = new Comparator() {
@Override public int compare(String a, String b) {
return a.compareTo(b);
}
};
/**
* Quick and dirty pattern to differentiate IP addresses from hostnames. This is an approximation
* of Android's private InetAddress#isNumeric API.
*
* This matches IPv6 addresses as a hex string containing at least one colon, and possibly
* including dots after the first colon. It matches IPv4 addresses as strings containing only
* decimal digits and dots. This pattern matches strings like "a:.23" and "54" that are neither IP
* addresses nor hostnames; they will be verified as IP addresses (which is a more strict
* verification).
*/
private static final Pattern VERIFY_AS_IP_ADDRESS = Pattern.compile(
"([0-9a-fA-F]*:[0-9a-fA-F:.]*)|([\\d.]+)");
private Util() {
}
public static void checkOffsetAndCount(long arrayLength, long offset, long count) {
if ((offset | count) < 0 || offset > arrayLength || arrayLength - offset < count) {
throw new ArrayIndexOutOfBoundsException();
}
}
/** Returns true if two possibly-null objects are equal. */
public static boolean equal(Object a, Object b) {
return a == b || (a != null && a.equals(b));
}
/**
* Closes {@code closeable}, ignoring any checked exceptions. Does nothing if {@code closeable} is
* null.
*/
public static void closeQuietly(Closeable closeable) {
if (closeable != null) {
try {
closeable.close();
} catch (RuntimeException rethrown) {
throw rethrown;
} catch (Exception ignored) {
}
}
}
/**
* Closes {@code socket}, ignoring any checked exceptions. Does nothing if {@code socket} is
* null.
*/
public static void closeQuietly(Socket socket) {
if (socket != null) {
try {
socket.close();
} catch (AssertionError e) {
if (!isAndroidGetsocknameError(e)) throw e;
} catch (RuntimeException rethrown) {
throw rethrown;
} catch (Exception ignored) {
}
}
}
/**
* Closes {@code serverSocket}, ignoring any checked exceptions. Does nothing if {@code
* serverSocket} is null.
*/
public static void closeQuietly(ServerSocket serverSocket) {
if (serverSocket != null) {
try {
serverSocket.close();
} catch (RuntimeException rethrown) {
throw rethrown;
} catch (Exception ignored) {
}
}
}
/**
* Attempts to exhaust {@code source}, returning true if successful. This is useful when reading a
* complete source is helpful, such as when doing so completes a cache body or frees a socket
* connection for reuse.
*/
public static boolean discard(Source source, int timeout, TimeUnit timeUnit) {
try {
return skipAll(source, timeout, timeUnit);
} catch (IOException e) {
return false;
}
}
/**
* Reads until {@code in} is exhausted or the deadline has been reached. This is careful to not
* extend the deadline if one exists already.
*/
public static boolean skipAll(Source source, int duration, TimeUnit timeUnit) throws IOException {
long now = System.nanoTime();
long originalDuration = source.timeout().hasDeadline()
? source.timeout().deadlineNanoTime() - now
: Long.MAX_VALUE;
source.timeout().deadlineNanoTime(now + Math.min(originalDuration, timeUnit.toNanos(duration)));
try {
Buffer skipBuffer = new Buffer();
while (source.read(skipBuffer, 8192) != -1) {
skipBuffer.clear();
}
return true; // Success! The source has been exhausted.
} catch (InterruptedIOException e) {
return false; // We ran out of time before exhausting the source.
} finally {
if (originalDuration == Long.MAX_VALUE) {
source.timeout().clearDeadline();
} else {
source.timeout().deadlineNanoTime(now + originalDuration);
}
}
}
/** Returns an immutable copy of {@code list}. */
public static List immutableList(List list) {
return Collections.unmodifiableList(new ArrayList<>(list));
}
/** Returns an immutable list containing {@code elements}. */
public static List immutableList(T... elements) {
return Collections.unmodifiableList(Arrays.asList(elements.clone()));
}
public static ThreadFactory threadFactory(final String name, final boolean daemon) {
return new ThreadFactory() {
@Override public Thread newThread(Runnable runnable) {
Thread result = new Thread(runnable, name);
result.setDaemon(daemon);
return result;
}
};
}
/**
* Returns an array containing only elements found in {@code first} and also in {@code
* second}. The returned elements are in the same order as in {@code first}.
*/
@SuppressWarnings("unchecked")
public static String[] intersect(
Comparator comparator, String[] first, String[] second) {
List result = new ArrayList<>();
for (String a : first) {
for (String b : second) {
if (comparator.compare(a, b) == 0) {
result.add(a);
break;
}
}
}
return result.toArray(new String[result.size()]);
}
/**
* Returns true if there is an element in {@code first} that is also in {@code second}. This
* method terminates if any intersection is found. The sizes of both arguments are assumed to be
* so small, and the likelihood of an intersection so great, that it is not worth the CPU cost of
* sorting or the memory cost of hashing.
*/
public static boolean nonEmptyIntersection(
Comparator comparator, String[] first, String[] second) {
if (first == null || second == null || first.length == 0 || second.length == 0) {
return false;
}
for (String a : first) {
for (String b : second) {
if (comparator.compare(a, b) == 0) {
return true;
}
}
}
return false;
}
public static String hostHeader(HttpUrl url, boolean includeDefaultPort) {
String host = url.host().contains(":")
? "[" + url.host() + "]"
: url.host();
return includeDefaultPort || url.port() != HttpUrl.defaultPort(url.scheme())
? host + ":" + url.port()
: host;
}
/** Returns {@code s} with control characters and non-ASCII characters replaced with '?'. */
public static String toHumanReadableAscii(String s) {
for (int i = 0, length = s.length(), c; i < length; i += Character.charCount(c)) {
c = s.codePointAt(i);
if (c > '\u001f' && c < '\u007f') continue;
Buffer buffer = new Buffer();
buffer.writeUtf8(s, 0, i);
for (int j = i; j < length; j += Character.charCount(c)) {
c = s.codePointAt(j);
buffer.writeUtf8CodePoint(c > '\u001f' && c < '\u007f' ? c : '?');
}
return buffer.readUtf8();
}
return s;
}
/**
* Returns true if {@code e} is due to a firmware bug fixed after Android 4.2.2.
* https://code.google.com/p/android/issues/detail?id=54072
*/
public static boolean isAndroidGetsocknameError(AssertionError e) {
return e.getCause() != null && e.getMessage() != null
&& e.getMessage().contains("getsockname failed");
}
public static int indexOf(Comparator comparator, String[] array, String value) {
for (int i = 0, size = array.length; i < size; i++) {
if (comparator.compare(array[i], value) == 0) return i;
}
return -1;
}
public static String[] concat(String[] array, String value) {
String[] result = new String[array.length + 1];
System.arraycopy(array, 0, result, 0, array.length);
result[result.length - 1] = value;
return result;
}
/**
* Increments {@code pos} until {@code input[pos]} is not ASCII whitespace. Stops at {@code
* limit}.
*/
public static int skipLeadingAsciiWhitespace(String input, int pos, int limit) {
for (int i = pos; i < limit; i++) {
switch (input.charAt(i)) {
case '\t':
case '\n':
case '\f':
case '\r':
case ' ':
continue;
default:
return i;
}
}
return limit;
}
/**
* Decrements {@code limit} until {@code input[limit - 1]} is not ASCII whitespace. Stops at
* {@code pos}.
*/
public static int skipTrailingAsciiWhitespace(String input, int pos, int limit) {
for (int i = limit - 1; i >= pos; i--) {
switch (input.charAt(i)) {
case '\t':
case '\n':
case '\f':
case '\r':
case ' ':
continue;
default:
return i + 1;
}
}
return pos;
}
/** Equivalent to {@code string.substring(pos, limit).trim()}. */
public static String trimSubstring(String string, int pos, int limit) {
int start = skipLeadingAsciiWhitespace(string, pos, limit);
int end = skipTrailingAsciiWhitespace(string, start, limit);
return string.substring(start, end);
}
/**
* Returns the index of the first character in {@code input} that contains a character in {@code
* delimiters}. Returns limit if there is no such character.
*/
public static int delimiterOffset(String input, int pos, int limit, String delimiters) {
for (int i = pos; i < limit; i++) {
if (delimiters.indexOf(input.charAt(i)) != -1) return i;
}
return limit;
}
/**
* Returns the index of the first character in {@code input} that is {@code delimiter}. Returns
* limit if there is no such character.
*/
public static int delimiterOffset(String input, int pos, int limit, char delimiter) {
for (int i = pos; i < limit; i++) {
if (input.charAt(i) == delimiter) return i;
}
return limit;
}
/**
* Performs IDN ToASCII encoding and canonicalize the result to lowercase. e.g. This converts
* {@code ☃.net} to {@code xn--n3h.net}, and {@code WwW.GoOgLe.cOm} to {@code www.google.com}.
* {@code null} will be returned if the input cannot be ToASCII encoded or if the result
* contains unsupported ASCII characters.
*/
public static String domainToAscii(String input) {
try {
String result = IDN.toASCII(input).toLowerCase(Locale.US);
if (result.isEmpty()) return null;
// Confirm that the IDN ToASCII result doesn't contain any illegal characters.
if (containsInvalidHostnameAsciiCodes(result)) {
return null;
}
// TODO: implement all label limits.
return result;
} catch (IllegalArgumentException e) {
return null;
}
}
private static boolean containsInvalidHostnameAsciiCodes(String hostnameAscii) {
for (int i = 0; i < hostnameAscii.length(); i++) {
char c = hostnameAscii.charAt(i);
// The WHATWG Host parsing rules accepts some character codes which are invalid by
// definition for OkHttp's host header checks (and the WHATWG Host syntax definition). Here
// we rule out characters that would cause problems in host headers.
if (c <= '\u001f' || c >= '\u007f') {
return true;
}
// Check for the characters mentioned in the WHATWG Host parsing spec:
// U+0000, U+0009, U+000A, U+000D, U+0020, "#", "%", "/", ":", "?", "@", "[", "\", and "]"
// (excluding the characters covered above).
if (" #%/:?@[\\]".indexOf(c) != -1) {
return true;
}
}
return false;
}
/**
* Returns the index of the first character in {@code input} that is either a control character
* (like {@code \u0000 or \n}) or a non-ASCII character. Returns -1 if {@code input} has no such
* characters.
*/
public static int indexOfControlOrNonAscii(String input) {
for (int i = 0, length = input.length(); i < length; i++) {
char c = input.charAt(i);
if (c <= '\u001f' || c >= '\u007f') {
return i;
}
}
return -1;
}
/** Returns true if {@code host} is not a host name and might be an IP address. */
public static boolean verifyAsIpAddress(String host) {
return VERIFY_AS_IP_ADDRESS.matcher(host).matches();
}
/** Returns a {@link Locale#US} formatted {@link String}. */
public static String format(String format, Object... args) {
return String.format(Locale.US, format, args);
}
public static Charset bomAwareCharset(BufferedSource source, Charset charset) throws IOException {
if (source.rangeEquals(0, UTF_8_BOM)) {
source.skip(UTF_8_BOM.size());
return UTF_8;
}
if (source.rangeEquals(0, UTF_16_BE_BOM)) {
source.skip(UTF_16_BE_BOM.size());
return UTF_16_BE;
}
if (source.rangeEquals(0, UTF_16_LE_BOM)) {
source.skip(UTF_16_LE_BOM.size());
return UTF_16_LE;
}
if (source.rangeEquals(0, UTF_32_BE_BOM)) {
source.skip(UTF_32_BE_BOM.size());
return UTF_32_BE;
}
if (source.rangeEquals(0, UTF_32_LE_BOM)) {
source.skip(UTF_32_LE_BOM.size());
return UTF_32_LE;
}
return charset;
}
}