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/*
* Modifications Copyright (c) 2019 BrowserUp, Inc.
*/
package com.browserup.bup.util;
import io.netty.handler.codec.http.FullHttpMessage;
import io.netty.handler.codec.http.HttpContent;
import io.netty.handler.codec.http.HttpHeaderNames;
import io.netty.handler.codec.http.HttpHeaders;
import io.netty.handler.codec.http.HttpMessage;
import com.browserup.bup.exception.UnsupportedCharsetException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.nio.charset.Charset;
/**
* Utility class to assist with manipulation of {@link io.netty.handler.codec.http.HttpObject} instances, including
* {@link io.netty.handler.codec.http.HttpMessage} and {@link io.netty.handler.codec.http.HttpContent}.
*/
public class HttpObjectUtil {
private static final Logger log = LoggerFactory.getLogger(HttpObjectUtil.class);
/**
* Replaces the entity body of the message with the specified contents. Encodes the message contents according to charset in the message's
* Content-Type header, or uses {@link BrowserUpHttpUtil#DEFAULT_HTTP_CHARSET} if none is specified.
* Note: If the charset of the message is not supported on this platform, this will throw an {@link java.nio.charset.UnsupportedCharsetException}.
*
* TODO: Currently this method only works for FullHttpMessages, since it must modify the Content-Length header; determine if this may be applied to chunked messages as well
*
* @param message the HTTP message to manipulate
* @param newContents the new entity body contents
* @throws java.nio.charset.UnsupportedCharsetException if the charset in the message is not supported on this platform
*/
public static void replaceTextHttpEntityBody(FullHttpMessage message, String newContents) {
// get the content type for this message so we can encode the newContents into a byte stream appropriately
String contentTypeHeader = message.headers().get(HttpHeaderNames.CONTENT_TYPE);
Charset messageCharset;
try {
messageCharset = BrowserUpHttpUtil.readCharsetInContentTypeHeader(contentTypeHeader);
} catch (UnsupportedCharsetException e) {
java.nio.charset.UnsupportedCharsetException cause = e.getUnsupportedCharsetExceptionCause() ;
log.error("Found unsupported character set in Content-Type header '{}' while attempting to replace contents of HTTP message.", contentTypeHeader, cause);
throw cause;
}
if (messageCharset == null) {
messageCharset = BrowserUpHttpUtil.DEFAULT_HTTP_CHARSET;
log.warn("No character set declared in HTTP message. Replacing text using default charset {}.", messageCharset);
}
byte[] contentBytes = newContents.getBytes(messageCharset);
replaceBinaryHttpEntityBody(message, contentBytes);
}
/**
* Replaces an HTTP entity body with the specified binary contents.
* TODO: Currently this method only works for FullHttpMessages, since it must modify the Content-Length header; determine if this may be applied to chunked messages as well
*
* @param message the HTTP message to manipulate
* @param newBinaryContents the new entity body contents
*/
public static void replaceBinaryHttpEntityBody(FullHttpMessage message, byte[] newBinaryContents) {
message.content().resetWriterIndex();
// resize the buffer if needed, since the new message may be longer than the old one
message.content().ensureWritable(newBinaryContents.length, true);
message.content().writeBytes(newBinaryContents);
// update the Content-Length header, since the size may have changed
message.headers().set(HttpHeaderNames.CONTENT_LENGTH, newBinaryContents.length);
}
/**
* Extracts the entity body from an HTTP content object, according to the specified character set. The character set cannot be null. If
* the character set is not specified or is unknown, you still must specify a suitable default charset (see {@link BrowserUpHttpUtil#DEFAULT_HTTP_CHARSET}).
*
* @param httpContent HTTP content object to extract the entity body from
* @param charset character set of the entity body
* @return String representation of the entity body
* @throws IllegalArgumentException if the charset is null
*/
public static String extractHttpEntityBody(HttpContent httpContent, Charset charset) {
if (charset == null) {
throw new IllegalArgumentException("No charset specified when extracting the contents of an HTTP message");
}
byte[] contentBytes = BrowserUpHttpUtil.extractReadableBytes(httpContent.content());
return new String(contentBytes, charset);
}
/**
* Extracts the entity body from a FullHttpMessage, according to the character set in the message's Content-Type header. If the Content-Type
* header is not present or does not specify a charset, assumes the ISO-8859-1 character set (see {@link BrowserUpHttpUtil#DEFAULT_HTTP_CHARSET}).
*
* @param httpMessage HTTP message to extract entity body from
* @return String representation of the entity body
* @throws java.nio.charset.UnsupportedCharsetException if there is a charset specified in the content-type header, but it is not supported
*/
public static String extractHttpEntityBody(FullHttpMessage httpMessage) {
Charset charset;
try {
charset = getCharsetFromMessage(httpMessage);
} catch (UnsupportedCharsetException e) {
// the declared character set is not supported, so it is impossible to decode the contents of the message. log an error and throw an exception
// to alert the client code.
java.nio.charset.UnsupportedCharsetException cause = e.getUnsupportedCharsetExceptionCause();
String contentTypeHeader = HttpHeaders.getHeader(httpMessage, HttpHeaderNames.CONTENT_TYPE);
log.error("Cannot retrieve text contents of message because HTTP message declares a character set that is not supported on this platform. Content type header: {}.", contentTypeHeader, cause);
throw cause;
}
return extractHttpEntityBody(httpMessage, charset);
}
/**
* Derives the charset from the Content-Type header in the HttpMessage. If the Content-Type header is not present or does not contain
* a character set, this method returns the ISO-8859-1 character set. See {@link BrowserUpHttpUtil#readCharsetInContentTypeHeader(String)}
* for more details.
*
* @param httpMessage HTTP message to extract charset from
* @return the charset associated with the HTTP message, or the default charset if none is present
* @throws UnsupportedCharsetException if there is a charset specified in the content-type header, but it is not supported
*/
public static Charset getCharsetFromMessage(HttpMessage httpMessage) throws UnsupportedCharsetException {
String contentTypeHeader = HttpHeaders.getHeader(httpMessage, HttpHeaderNames.CONTENT_TYPE);
Charset charset = BrowserUpHttpUtil.readCharsetInContentTypeHeader(contentTypeHeader);
if (charset == null) {
return BrowserUpHttpUtil.DEFAULT_HTTP_CHARSET;
}
return charset;
}
/**
* Extracts the binary contents from an HTTP message.
*
* @param httpContent HTTP content object to extract the entity body from
* @return binary contents of the HTTP message
*/
public static byte[] extractBinaryHttpEntityBody(HttpContent httpContent) {
return BrowserUpHttpUtil.extractReadableBytes(httpContent.content());
}
}
