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Async Http Client library purpose is to allow Java applications to easily execute HTTP requests and
asynchronously process the HTTP responses.
/*
* Copyright (c) 2014 AsyncHttpClient Project. All rights reserved.
*
* This program is licensed to you under the Apache License Version 2.0,
* and you may not use this file except in compliance with the Apache License Version 2.0.
* You may obtain a copy of the Apache License Version 2.0 at
* http://www.apache.org/licenses/LICENSE-2.0.
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the Apache License Version 2.0 is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the Apache License Version 2.0 for the specific language governing permissions and limitations there under.
*/
package com.ning.http.client.uri;
final class UriParser {
public String scheme;
public String host;
public int port = -1;
public String query;
public String authority;
public String path;
public String userInfo;
private int start, end = 0;
private String urlWithoutQuery;
private void trimRight(String originalUrl) {
end = originalUrl.length();
while (end > 0 && originalUrl.charAt(end - 1) <= ' ')
end--;
}
private void trimLeft(String originalUrl) {
while (start < end && originalUrl.charAt(start) <= ' ')
start++;
if (originalUrl.regionMatches(true, start, "url:", 0, 4))
start += 4;
}
private boolean isFragmentOnly(String originalUrl) {
return start < originalUrl.length() && originalUrl.charAt(start) == '#';
}
private boolean isValidProtocolChar(char c) {
return Character.isLetterOrDigit(c) && c != '.' && c != '+' && c != '-';
}
private boolean isValidProtocolChars(String protocol) {
for (int i = 1; i < protocol.length(); i++) {
if (!isValidProtocolChar(protocol.charAt(i)))
return false;
}
return true;
}
private boolean isValidProtocol(String protocol) {
return protocol.length() > 0 && Character.isLetter(protocol.charAt(0)) && isValidProtocolChars(protocol);
}
private void computeInitialScheme(String originalUrl) {
for (int i = start; i < end; i++) {
char c = originalUrl.charAt(i);
if (c == ':') {
String s = originalUrl.substring(start, i);
if (isValidProtocol(s)) {
scheme = s.toLowerCase();
start = i + 1;
}
break;
} else if (c == '/')
break;
}
}
private boolean overrideWithContext(Uri context, String originalUrl) {
boolean isRelative = false;
// only use context if the schemes match
if (context != null && (scheme == null || scheme.equalsIgnoreCase(context.getScheme()))) {
// see RFC2396 5.2.3
String contextPath = context.getPath();
if (isNotEmpty(contextPath) && contextPath.charAt(0) == '/')
scheme = null;
if (scheme == null) {
scheme = context.getScheme();
userInfo = context.getUserInfo();
host = context.getHost();
port = context.getPort();
path = contextPath;
isRelative = true;
}
}
return isRelative;
}
private void computeFragment(String originalUrl) {
int charpPosition = originalUrl.indexOf('#', start);
if (charpPosition >= 0) {
end = charpPosition;
}
}
private void inheritContextQuery(Uri context, boolean isRelative) {
// see RFC2396 5.2.2: query and fragment inheritance
if (isRelative && start == end) {
query = context.getQuery();
}
}
private boolean splitUrlAndQuery(String originalUrl) {
boolean queryOnly = false;
urlWithoutQuery = originalUrl;
if (start < end) {
int askPosition = originalUrl.indexOf('?');
queryOnly = askPosition == start;
if (askPosition != -1 && askPosition < end) {
query = originalUrl.substring(askPosition + 1, end);
if (end > askPosition)
end = askPosition;
urlWithoutQuery = originalUrl.substring(0, askPosition);
}
}
return queryOnly;
}
private boolean currentPositionStartsWith4Slashes() {
return urlWithoutQuery.regionMatches(start, "////", 0, 4);
}
private boolean currentPositionStartsWith2Slashes() {
return urlWithoutQuery.regionMatches(start, "//", 0, 2);
}
private void computeAuthority() {
int authorityEndPosition = urlWithoutQuery.indexOf('/', start);
if (authorityEndPosition < 0) {
authorityEndPosition = urlWithoutQuery.indexOf('?', start);
if (authorityEndPosition < 0)
authorityEndPosition = end;
}
host = authority = urlWithoutQuery.substring(start, authorityEndPosition);
start = authorityEndPosition;
}
private void computeUserInfo() {
int atPosition = authority.indexOf('@');
if (atPosition != -1) {
userInfo = authority.substring(0, atPosition);
host = authority.substring(atPosition + 1);
} else
userInfo = null;
}
private boolean isMaybeIPV6() {
// If the host is surrounded by [ and ] then its an IPv6
// literal address as specified in RFC2732
return host.length() > 0 && host.charAt(0) == '[';
}
private void computeIPV6() {
int positionAfterClosingSquareBrace = host.indexOf(']') + 1;
if (positionAfterClosingSquareBrace > 1) {
port = -1;
if (host.length() > positionAfterClosingSquareBrace) {
if (host.charAt(positionAfterClosingSquareBrace) == ':') {
// see RFC2396: port can be null
int portPosition = positionAfterClosingSquareBrace + 1;
if (host.length() > portPosition) {
port = Integer.parseInt(host.substring(portPosition));
}
} else
throw new IllegalArgumentException("Invalid authority field: " + authority);
}
host = host.substring(0, positionAfterClosingSquareBrace);
} else
throw new IllegalArgumentException("Invalid authority field: " + authority);
}
private void computeRegularHostPort() {
int colonPosition = host.indexOf(':');
port = -1;
if (colonPosition >= 0) {
// see RFC2396: port can be null
int portPosition = colonPosition + 1;
if (host.length() > portPosition)
port = Integer.parseInt(host.substring(portPosition));
host = host.substring(0, colonPosition);
}
}
// /./
private void removeEmbeddedDot() {
path = path.replace("/./", "/");
}
// /../
private void removeEmbedded2Dots() {
int i = 0;
while ((i = path.indexOf("/../", i)) >= 0) {
if (i > 0) {
end = path.lastIndexOf('/', i - 1);
if (end >= 0 && path.indexOf("/../", end) != 0) {
path = path.substring(0, end) + path.substring(i + 3);
i = 0;
} else if (end == 0) {
break;
}
} else
i = i + 3;
}
}
private void removeTailing2Dots() {
while (path.endsWith("/..")) {
end = path.lastIndexOf('/', path.length() - 4);
if (end >= 0)
path = path.substring(0, end + 1);
else
break;
}
}
private void removeStartingDot() {
if (path.startsWith("./") && path.length() > 2)
path = path.substring(2);
}
private void removeTrailingDot() {
if (path.endsWith("/."))
path = path.substring(0, path.length() - 1);
}
private void initRelativePath() {
int lastSlashPosition = path.lastIndexOf('/');
String pathEnd = urlWithoutQuery.substring(start, end);
if (lastSlashPosition == -1)
path = authority != null ? "/" + pathEnd : pathEnd;
else
path = path.substring(0, lastSlashPosition + 1) + pathEnd;
}
private void handlePathDots() {
if (path.indexOf('.') != -1) {
removeEmbeddedDot();
removeEmbedded2Dots();
removeTailing2Dots();
removeStartingDot();
removeTrailingDot();
}
}
private void parseAuthority() {
if (!currentPositionStartsWith4Slashes() && currentPositionStartsWith2Slashes()) {
start += 2;
computeAuthority();
computeUserInfo();
if (host != null) {
if (isMaybeIPV6())
computeIPV6();
else
computeRegularHostPort();
}
if (port < -1)
throw new IllegalArgumentException("Invalid port number :" + port);
// see RFC2396 5.2.4: ignore context path if authority is defined
if (isNotEmpty(authority))
path = "";
}
}
private void handleRelativePath() {
initRelativePath();
handlePathDots();
}
private void computeRegularPath() {
if (urlWithoutQuery.charAt(start) == '/')
path = urlWithoutQuery.substring(start, end);
else if (isNotEmpty(path))
handleRelativePath();
else {
String pathEnd = urlWithoutQuery.substring(start, end);
path = authority != null ? "/" + pathEnd : pathEnd;
}
}
private void computeQueryOnlyPath() {
int lastSlashPosition = path.lastIndexOf('/');
path = lastSlashPosition < 0 ? "/" : path.substring(0, lastSlashPosition) + "/";
}
private void computePath(boolean queryOnly) {
// Parse the file path if any
if (start < end)
computeRegularPath();
else if (queryOnly && path != null)
computeQueryOnlyPath();
else if (path == null)
path = "";
}
public void parse(Uri context, final String originalUrl) {
if (originalUrl == null)
throw new NullPointerException("originalUrl");
boolean isRelative = false;
trimRight(originalUrl);
trimLeft(originalUrl);
if (!isFragmentOnly(originalUrl))
computeInitialScheme(originalUrl);
overrideWithContext(context, originalUrl);
computeFragment(originalUrl);
inheritContextQuery(context, isRelative);
boolean queryOnly = splitUrlAndQuery(originalUrl);
parseAuthority();
computePath(queryOnly);
}
private static boolean isNotEmpty(String string) {
return string != null && string.length() > 0;
}
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