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Mica net is a net framework.
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Licensed under the Apache License, Version 2.0 (the "License");
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*/
package org.tio.http.common;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.tio.core.ChannelContext;
import org.tio.core.Node;
import org.tio.core.exception.TioDecodeException;
import org.tio.http.common.HttpConst.RequestBodyFormat;
import org.tio.http.common.utils.HttpParseUtils;
import org.tio.http.common.utils.IpUtils;
import org.tio.utils.SysConst;
import org.tio.utils.hutool.StrUtil;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;
/**
* http server中使用
*
* @author tanyaowu
*/
public class HttpRequestDecoder {
private static final Logger log = LoggerFactory.getLogger(HttpRequestDecoder.class);
public HttpRequestDecoder() {
}
/**
* @param buffer
* @param limit
* @param position
* @param readableLength
* @param channelContext
* @param httpConfig
* @return HttpRequest
* @throws TioDecodeException
*/
public static HttpRequest decode(ByteBuffer buffer, int limit, int position, int readableLength, ChannelContext channelContext, HttpConfig httpConfig)
throws TioDecodeException {
Map headers = new HashMap<>();
int contentLength;
byte[] bodyBytes;
RequestLine firstLine = parseRequestLine(buffer, httpConfig);
if (firstLine == null) {
return null;
}
// request header start
boolean headerCompleted = parseHeaderLine(buffer, headers, 0, httpConfig);
if (!headerCompleted) {
return null;
}
String contentLengthStr = headers.get(HttpConst.RequestHeaderKey.Content_Length);
if (StrUtil.isBlank(contentLengthStr)) {
contentLength = 0;
} else {
contentLength = Integer.parseInt(contentLengthStr);
if (contentLength > httpConfig.getMaxLengthOfPostBody()) {
throw new TioDecodeException("post body length is too big[" + contentLength + "], max length is " + httpConfig.getMaxLengthOfPostBody() + " byte");
}
}
int headerLength = (buffer.position() - position);
int allNeedLength = headerLength + contentLength; //这个packet所需要的字节长度(含头部和体部)
int notReceivedLength = allNeedLength - readableLength; //尚未接收到的数据长度
if (notReceivedLength > 0) {
if (notReceivedLength > channelContext.getReadBufferSize()) {
channelContext.setReadBufferSize(notReceivedLength);
}
channelContext.setPacketNeededLength(allNeedLength);
return null;
}
// request header end
// ----------------------------------------------- request body start
String realIp = IpUtils.getRealIp(channelContext, httpConfig, headers);
if (httpConfig.checkHost && !headers.containsKey(HttpConst.RequestHeaderKey.Host)) {
throw new TioDecodeException("there is no host header");
}
Node realNode;
if (Objects.equals(realIp, channelContext.getClientNode().getIp())) {
realNode = channelContext.getClientNode();
} else {
// realNode
realNode = new Node(realIp, channelContext.getClientNode().getPort());
channelContext.setProxyClientNode(realNode);
}
HttpRequest httpRequest = new HttpRequest(realNode);
httpRequest.setRequestLine(firstLine);
httpRequest.setChannelContext(channelContext);
httpRequest.setHttpConfig(httpConfig);
httpRequest.setHeaders(headers);
httpRequest.setContentLength(contentLength);
String connection = headers.get(HttpConst.RequestHeaderKey.Connection);
if (connection != null) {
httpRequest.setConnection(connection.toLowerCase());
}
if (StrUtil.isNotBlank(firstLine.queryString)) {
decodeParams(httpRequest.getParams(), firstLine.queryString, httpRequest.getCharset());
}
if (contentLength > 0) {
bodyBytes = new byte[contentLength];
buffer.get(bodyBytes);
httpRequest.setBody(bodyBytes);
//解析消息体
parseBody(httpRequest, firstLine, bodyBytes, channelContext, httpConfig);
}
// ----------------------------------------------- request body end
return httpRequest;
}
/**
* @param params
* @param queryString
* @param charset
* @throws TioDecodeException
*/
public static void decodeParams(Map params, String queryString, Charset charset) throws TioDecodeException {
if (StrUtil.isBlank(queryString)) {
return;
}
String[] keyValues = queryString.split(SysConst.STR_AMP);
for (String keyValue : keyValues) {
String[] keyValueArr = keyValue.split(SysConst.STR_EQ);
String value1 = null;
if (keyValueArr.length == 2) {
value1 = keyValueArr[1];
} else if (keyValueArr.length > 2) {
throw new TioDecodeException("含有多个" + SysConst.STR_EQ);
}
String key = keyValueArr[0];
String value;
if (StrUtil.isBlank(value1)) {
value = null;
} else {
try {
value = URLDecoder.decode(value1, charset.name());
} catch (UnsupportedEncodingException e) {
throw new TioDecodeException(e);
}
}
Object[] existValue = params.get(key);
String[] newExistValue;
if (existValue == null) {
newExistValue = new String[]{value};
} else {
newExistValue = new String[existValue.length + 1];
System.arraycopy(existValue, 0, newExistValue, 0, existValue.length);
newExistValue[newExistValue.length - 1] = value;
}
params.put(key, newExistValue);
}
}
/**
* 解析消息体
*
* @param httpRequest
* @param firstLine
* @param bodyBytes
* @param channelContext
* @param httpConfig
* @throws TioDecodeException
*/
private static void parseBody(HttpRequest httpRequest, RequestLine firstLine, byte[] bodyBytes, ChannelContext channelContext, HttpConfig httpConfig)
throws TioDecodeException {
parseBodyFormat(httpRequest, httpRequest.getHeaders());
RequestBodyFormat bodyFormat = httpRequest.getBodyFormat();
httpRequest.setBody(bodyBytes);
switch (bodyFormat) {
case MULTIPART:
if (log.isDebugEnabled()) {
String bodyString;
if (bodyBytes != null && bodyBytes.length > 0) {
bodyString = new String(bodyBytes, httpRequest.getCharset());
log.debug("{} multipart body value\r\n{}", channelContext, bodyString);
}
}
//【multipart/form-data; boundary=----WebKitFormBoundaryuwYcfA2AIgxqIxA0】
String contentType = httpRequest.getHeader(HttpConst.RequestHeaderKey.Content_Type);
String initboundary = HttpParseUtils.getSubAttribute(contentType, "boundary");
if (log.isDebugEnabled()) {
log.debug("{}, initboundary:{}", channelContext, initboundary);
}
HttpMultiBodyDecoder.decode(httpRequest, firstLine, bodyBytes, initboundary, channelContext, httpConfig);
break;
default:
String bodyString = null;
if (bodyBytes != null && bodyBytes.length > 0) {
bodyString = new String(bodyBytes, httpRequest.getCharset());
httpRequest.setBodyString(bodyString);
if (log.isInfoEnabled()) {
log.info("{} body value\r\n{}", channelContext, bodyString);
}
}
if (bodyFormat == RequestBodyFormat.URLENCODED) {
parseUrlencoded(httpRequest, bodyString);
}
break;
}
}
/**
* Content-Type : application/x-www-form-urlencoded; charset=UTF-8
* Content-Type : application/x-www-form-urlencoded; charset=UTF-8
*
* @param httpRequest HttpRequest
* @param headers headers
*/
public static void parseBodyFormat(HttpRequest httpRequest, Map headers) {
String contentTypeStr = headers.get(HttpConst.RequestHeaderKey.Content_Type);
String contentType = null;
if (contentTypeStr != null) {
contentType = contentTypeStr.toLowerCase();
}
if (contentType == null) {
httpRequest.setBodyFormat(RequestBodyFormat.URLENCODED);
} else if (contentType.startsWith(HttpConst.RequestHeaderValue.Content_Type.text_plain)) {
httpRequest.setBodyFormat(RequestBodyFormat.TEXT);
} else if (contentType.startsWith(HttpConst.RequestHeaderValue.Content_Type.multipart_form_data)) {
httpRequest.setBodyFormat(RequestBodyFormat.MULTIPART);
} else {
httpRequest.setBodyFormat(RequestBodyFormat.URLENCODED);
}
if (StrUtil.isNotBlank(contentType)) {
String charset = HttpParseUtils.getSubAttribute(contentType, "charset");
if (StrUtil.isNotBlank(charset)) {
httpRequest.setCharset(Charset.forName(charset));
} else {
httpRequest.setCharset(SysConst.DEFAULT_CHARSET);
}
}
}
/**
* 解析请求头的每一行
*
* @param buffer
* @param headers
* @param hasReceivedHeaderLength
* @param httpConfig
* @return 头部是否解析完成，true: 解析完成, false: 没有解析完成
* @throws TioDecodeException
*/
public static boolean parseHeaderLine(ByteBuffer buffer, Map headers, int hasReceivedHeaderLength, HttpConfig httpConfig) throws TioDecodeException {
byte[] allBs = buffer.array();
int initPosition = buffer.position();
int lastPosition = initPosition;
int remaining = buffer.remaining();
if (remaining == 0) {
return false;
} else if (remaining > 1) {
byte b1 = buffer.get();
byte b2 = buffer.get();
if (SysConst.CR == b1 && SysConst.LF == b2) {
return true;
} else if (SysConst.LF == b1) {
return true;
}
} else {
if (SysConst.LF == buffer.get()) {
return true;
}
}
String name = null;
String value = null;
boolean hasValue = false;
boolean needIteration = false;
while (buffer.hasRemaining()) {
byte b = buffer.get();
if (name == null) {
if (b == SysConst.COL) {
int len = buffer.position() - lastPosition - 1;
name = new String(allBs, lastPosition, len);
lastPosition = buffer.position();
} else if (b == SysConst.LF) {
byte lastByte = buffer.get(buffer.position() - 2);
int len = buffer.position() - lastPosition - 1;
if (lastByte == SysConst.CR) {
len = buffer.position() - lastPosition - 2;
}
name = new String(allBs, lastPosition, len);
headers.put(name.toLowerCase(), "");
needIteration = true;
break;
}
} else if (value == null) {
if (b == SysConst.LF) {
byte lastByte = buffer.get(buffer.position() - 2);
int len = buffer.position() - lastPosition - 1;
if (lastByte == SysConst.CR) {
len = buffer.position() - lastPosition - 2;
}
value = new String(allBs, lastPosition, len);
headers.put(name.toLowerCase(), StrUtil.trimEnd(value));
needIteration = true;
break;
} else {
if (!hasValue && b == SysConst.SPACE) {
lastPosition = buffer.position();
} else {
hasValue = true;
}
}
}
}
// 这一行(header line)的字节数
int lineLength = buffer.position() - initPosition;
int maxLengthOfRequestLine = httpConfig.getMaxLengthOfRequestLine();
if (lineLength > maxLengthOfRequestLine) {
throw new TioDecodeException(name + " header line is too long, max length of header line is " + maxLengthOfRequestLine);
}
if (needIteration) {
// header占用的字节数
int headerLength = lineLength + hasReceivedHeaderLength;
int maxLengthOfHeader = httpConfig.getMaxLengthOfHeader();
if (headerLength > maxLengthOfHeader) {
throw new TioDecodeException("header is too long, max length of header is " + maxLengthOfHeader);
}
return parseHeaderLine(buffer, headers, headerLength, httpConfig);
}
return false;
}
/**
* parse request line(the first line)
*
* @param buffer GET /tio?value=tanyaowu HTTP/1.1
* @param httpConfig HttpConfig
* @return RequestLine
*/
public static RequestLine parseRequestLine(ByteBuffer buffer, HttpConfig httpConfig) throws TioDecodeException {
byte[] allBs = buffer.array();
int initPosition = buffer.position();
String methodStr = null;
String pathStr = null;
String queryStr = null;
String protocol = null;
String version = null;
int lastPosition = initPosition;
while (buffer.hasRemaining()) {
byte b = buffer.get();
if (methodStr == null) {
if (b == SysConst.SPACE) {
int len = buffer.position() - lastPosition - 1;
methodStr = new String(allBs, lastPosition, len);
lastPosition = buffer.position();
}
} else if (pathStr == null) {
if (b == SysConst.SPACE || b == SysConst.ASTERISK) {
int len = buffer.position() - lastPosition - 1;
pathStr = new String(allBs, lastPosition, len);
lastPosition = buffer.position();
if (b == SysConst.SPACE) {
queryStr = SysConst.BLANK;
}
}
} else if (queryStr == null) {
if (b == SysConst.SPACE) {
int len = buffer.position() - lastPosition - 1;
queryStr = new String(allBs, lastPosition, len);
lastPosition = buffer.position();
}
} else if (protocol == null) {
if (b == SysConst.BACKSLASH) {
int len = buffer.position() - lastPosition - 1;
protocol = new String(allBs, lastPosition, len);
lastPosition = buffer.position();
}
} else if (version == null) {
if (b == SysConst.LF) {
byte lastByte = buffer.get(buffer.position() - 2);
int len = buffer.position() - lastPosition - 1;
if (lastByte == SysConst.CR) {
len = buffer.position() - lastPosition - 2;
}
version = new String(allBs, lastPosition, len);
RequestLine requestLine = new RequestLine();
Method method = Method.from(methodStr);
requestLine.setMethod(method);
requestLine.setPath(pathStr);
requestLine.setInitPath(pathStr);
requestLine.setQueryString(queryStr);
requestLine.setProtocol(protocol);
requestLine.setVersion(version);
return requestLine;
}
}
}
int maxLengthOfRequestLine = httpConfig.getMaxLengthOfRequestLine();
if ((buffer.position() - initPosition) > maxLengthOfRequestLine) {
throw new TioDecodeException("request line is too long, max length of RequestLine is " + maxLengthOfRequestLine);
}
return null;
}
/**
* 解析URLENCODED格式的消息体
* 形如： 【Content-Type : application/x-www-form-urlencoded; charset=UTF-8】
*
* @throws TioDecodeException
*/
private static void parseUrlencoded(HttpRequest httpRequest, String bodyString) throws TioDecodeException {
decodeParams(httpRequest.getParams(), bodyString, httpRequest.getCharset());
}
}