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UriUtils.java
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/**
* Copyright 2012-2020 The Feign Authors
*
* 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 feign.template;
import feign.Util;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.nio.charset.Charset;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class UriUtils {
private static final Pattern PCT_ENCODED_PATTERN = Pattern.compile("%[0-9A-Fa-f][0-9A-Fa-f]");
/**
* Determines if the value is already pct-encoded.
*
* @param value to check.
* @return {@literal true} if the value is already pct-encoded
*/
public static boolean isEncoded(String value, Charset charset) {
for (byte b : value.getBytes(charset)) {
if (!isUnreserved((char) b) && b != '%') {
/* break if there are any unreserved character */
return false;
}
}
return PCT_ENCODED_PATTERN.matcher(value).find();
}
/**
* Uri Encode the value, using the default Charset. Already encoded values are skipped.
*
* @param value to encode.
* @return the encoded value.
*/
public static String encode(String value) {
return encodeChunk(value, Util.UTF_8, false);
}
/**
* Uri Encode the value. Already encoded values are skipped.
*
* @param value to encode.
* @param charset to use.
* @return the encoded value.
*/
public static String encode(String value, Charset charset) {
return encodeChunk(value, charset, false);
}
public static String encode(String value, boolean allowReservedCharacters) {
return encodeInternal(value, Util.UTF_8, allowReservedCharacters);
}
public static String encode(String value, Charset charset, boolean allowReservedCharacters) {
return encodeInternal(value, charset, allowReservedCharacters);
}
/**
* Uri Decode the value.
*
* @param value to decode
* @param charset to use.
* @return the decoded value.
*/
public static String decode(String value, Charset charset) {
try {
/* there is nothing special between uri and url decoding */
return URLDecoder.decode(value, charset.name());
} catch (UnsupportedEncodingException uee) {
/* since the encoding is not supported, return the original value */
return value;
}
}
/**
* Determines if the provided uri is an absolute uri.
*
* @param uri to evaluate.
* @return true if the uri is absolute.
*/
public static boolean isAbsolute(String uri) {
return uri != null && !uri.isEmpty() && uri.startsWith("http");
}
/**
* Encodes the value, preserving all reserved characters.. Values that are already pct-encoded are
* ignored.
*
* @param value inspect.
* @param charset to use.
* @return a new String with the reserved characters preserved.
*/
public static String encodeInternal(String value,
Charset charset,
boolean allowReservedCharacters) {
/* value is encoded, we need to split it up and skip the parts that are already encoded */
Matcher matcher = PCT_ENCODED_PATTERN.matcher(value);
if (!matcher.find()) {
return encodeChunk(value, charset, true);
}
int length = value.length();
StringBuilder encoded = new StringBuilder(length + 8);
int index = 0;
do {
/* split out the value before the encoded value */
String before = value.substring(index, matcher.start());
/* encode it */
encoded.append(encodeChunk(before, charset, allowReservedCharacters));
/* append the encoded value */
encoded.append(matcher.group());
/* update the string search index */
index = matcher.end();
} while (matcher.find());
/* append the rest of the string */
String tail = value.substring(index, length);
encoded.append(encodeChunk(tail, charset, allowReservedCharacters));
return encoded.toString();
}
/**
* Encode a Uri Chunk, ensuring that all reserved characters are also encoded.
*
* @param value to encode.
* @param charset to use.
* @return an encoded uri chunk.
*/
private static String encodeChunk(String value, Charset charset, boolean allowReserved) {
if (isEncoded(value, charset)) {
return value;
}
byte[] data = value.getBytes(charset);
try (ByteArrayOutputStream bos = new ByteArrayOutputStream()) {
for (byte b : data) {
if (isUnreserved((char) b)) {
bos.write(b);
} else if (isReserved((char) b) && allowReserved) {
bos.write(b);
} else {
pctEncode(b, bos);
}
}
return new String(bos.toByteArray(), charset);
} catch (IOException ioe) {
throw new IllegalStateException("Error occurred during encoding of the uri: "
+ ioe.getMessage(), ioe);
}
}
/**
* Percent Encode the provided byte.
*
* @param data to encode
* @param bos with the output stream to use.
*/
private static void pctEncode(byte data, ByteArrayOutputStream bos) {
bos.write('%');
char hex1 = Character.toUpperCase(Character.forDigit((data >> 4) & 0xF, 16));
char hex2 = Character.toUpperCase(Character.forDigit(data & 0xF, 16));
bos.write(hex1);
bos.write(hex2);
}
private static boolean isAlpha(int c) {
return (c >= 'a' && c <= 'z' || c >= 'A' && c <= 'Z');
}
private static boolean isDigit(int c) {
return (c >= '0' && c <= '9');
}
private static boolean isGenericDelimiter(int c) {
return (c == ':') || (c == '/') || (c == '?') || (c == '#') || (c == '[') || (c == ']')
|| (c == '@');
}
private static boolean isSubDelimiter(int c) {
return (c == '!') || (c == '$') || (c == '&') || (c == '\'') || (c == '(') || (c == ')')
|| (c == '*') || (c == '+') || (c == ',') || (c == ';') || (c == '=');
}
private static boolean isUnreserved(int c) {
return isAlpha(c) || isDigit(c) || c == '-' || c == '.' || c == '_' || c == '~';
}
private static boolean isReserved(int c) {
return isGenericDelimiter(c) || isSubDelimiter(c);
}
private boolean isPchar(int c) {
return isUnreserved(c) || isSubDelimiter(c) || c == ':' || c == '@';
}
}