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* Copyright (C) 2013 - 2014 Wisdom Framework
* %%
* Licensed under the Apache License, Version 2.0 (the "License");
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* 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,
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* See the License for the specific language governing permissions and
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package org.wisdom.api.http;
import com.google.common.net.MediaType;
import org.wisdom.api.cookies.Cookie;
import org.wisdom.api.cookies.Cookies;
import java.util.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* This class allows manipulating the HTTP Request headers.
*/
public abstract class RequestHeader {
/**
* Regex to parse a segment of the ACCEPT-LANGUAGE header.
* The group #1 contains the locale tag, while the group #5 contains the `q` value.
*/
private static final Pattern LANGUAGE_SEGMENT_PATTERN = Pattern.compile("([a-zA-Z]+(-[a-zA-Z]+)?(-[a-zA-Z]+)?)(;q=(.*))?");
/**
* @return the complete request URI, containing both path and query string.
*/
public abstract String uri();
/**
* The client IP address.
*
* If the X-Forwarded-For header is present, then this method will return the value in that header
* if either the local address is 127.0.0.1, or if trustxforwarded is configured to be true in the
* application configuration file.
*
* @return the client IP address
*/
public abstract String remoteAddress();
/**
* @return The request host.
*/
public abstract String host();
/**
* @return The URI path (without the query).
*/
public abstract String path();
/**
* @return The preferred media type in the request {@literal Accept header}.
*/
public abstract MediaType mediaType();
/**
* @return The set of media types from the request Accept header, sorted by preference (preferred first). If the
* Accept header is not set, it must return the singleton list [text/*].
*/
public abstract Collection mediaTypes();
/**
* Checks if this request accepts a given media type.
*
* @param mimeType the mime type to check.
* @return true if {@code mimeType} is in the {@literal Accept} header, otherwise false
*/
public abstract boolean accepts(String mimeType);
/**
* @return the request cookies
*/
public abstract Cookies cookies();
/**
* Gets the cookie having the given name.
*
* @param name the cookie to retrieve
* @return the cookie, if found, otherwise null.
*/
public Cookie cookie(String name) {
return cookies().get(name);
}
/**
* Retrieves all headers.
*
* @return headers
*/
public abstract java.util.Map> headers();
/**
* Retrieves a single header.
*
* @param headerName the header name
* @return the value of the header. If the header has multiple value,
* the first one is returned. If the header has no value (is not specified in the request),
* {@literal null} is returned.
*/
public String getHeader(String headerName) {
List headers = null;
for (String h : headers().keySet()) {
if (headerName.equalsIgnoreCase(h)) {
headers = headers().get(h);
break;
}
}
if (headers == null || headers.isEmpty()) {
return null;
}
return headers.get(0);
}
/**
* Get the encoding that is acceptable for the client. E.g. Accept-Encoding:
* compress, gzip
*
* The Accept-Encoding request-header field is similar to Accept, but
* restricts the content-codings that are acceptable in the response.
*
* @return the encoding that is acceptable for the client
* @see http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html
*/
public abstract String encoding();
/**
* Get the language that is acceptable for the client. E.g. Accept-Language:
* da, en-gb;q=0.8, en;q=0.7
*
* The Accept-Language request-header field is similar to Accept, but
* restricts the set of natural languages that are preferred as a response
* to the request.
*
* @return the language that is acceptable for the client
* @see http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html
*/
public abstract String language();
/**
* Get the locale that are acceptable for the client. E.g. Accept-Language:
* da, en-gb;q=0.8, en;q=0.7
*
* The Accept-Language request-header field is similar to Accept, but
* restricts the set of natural languages that are preferred as a response
* to the request.
*
* This method builds an ordered list of locale (favorite first).
*
* @return the set of locale that are acceptable for the client in the preference order.
* @see http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html
*/
public Locale[] languages() {
return getLocaleList(getHeader(HeaderNames.ACCEPT_LANGUAGE));
}
/**
* Get the charset that is acceptable for the client. E.g. Accept-Charset:
* iso-8859-5, unicode-1-1;q=0.8
*
* The Accept-Charset request-header field can be used to indicate what
* character sets are acceptable for the response. This field allows clients
* capable of understanding more comprehensive or special- purpose character
* sets to signal that capability to a server which is capable of
* representing documents in those character sets.
*
* @return the charset that is acceptable for the client
* @see http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html
*/
public abstract String charset();
/**
* Builds the list of locale in the preference order accepted by the client. For reminder,
* the ACCEPT-LANGUAGE header follows this convention:
*
*
* Accept-Language = "Accept-Language" ":"
* 1#( language-range [ ";" "q" "=" qvalue ] )
* language-range = ( ( 1*8ALPHA *( "-" 1*8ALPHA ) ) | "*" )
*
*
*
* @param accept the ACCEPT-LANGUAGE header value
* @return the list of locale, empty if the header is {@literal null} or non-parseable
* @see RequestHeader#languages()
*/
public static Locale[] getLocaleList(String accept) {
if (accept == null || accept.length() == 0) {
return new Locale[0];
}
Map> locales = new TreeMap<>(new Comparator() {
@Override
public int compare(Float o1, Float o2) {
return o2.compareTo(o1);
}
});
String[] segments = accept.split(",");
for (String segment : segments) {
Matcher matcher = LANGUAGE_SEGMENT_PATTERN.matcher(segment.trim());
if (!matcher.matches()) {
continue;
}
float q = 1;
if (matcher.group(5) != null) {
q = Float.valueOf(matcher.group(5));
}
List l = locales.get(q);
if (l == null) {
l = new ArrayList<>();
locales.put(q, l);
}
l.add(Locale.forLanguageTag(matcher.group(1)));
}
// Now iterates from highest q to lowest.
List list = new ArrayList<>();
for (Map.Entry> entry : locales.entrySet()) {
list.addAll(entry.getValue());
}
return list.toArray(new Locale[list.size()]);
}
}