/*
* JBoss, Home of Professional Open Source.
* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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 io.undertow.server.protocol.http;
import java.io.UnsupportedEncodingException;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.Map;
import io.undertow.UndertowMessages;
import io.undertow.UndertowOptions;
import io.undertow.annotationprocessor.HttpParserConfig;
import io.undertow.server.HttpServerExchange;
import io.undertow.util.Headers;
import io.undertow.util.HttpString;
import io.undertow.util.Methods;
import io.undertow.util.Protocols;
import io.undertow.util.URLUtils;
import io.undertow.util.BadRequestException;
import org.xnio.OptionMap;
import static io.undertow.util.Headers.ACCEPT_CHARSET_STRING;
import static io.undertow.util.Headers.ACCEPT_ENCODING_STRING;
import static io.undertow.util.Headers.ACCEPT_LANGUAGE_STRING;
import static io.undertow.util.Headers.ACCEPT_RANGES_STRING;
import static io.undertow.util.Headers.ACCEPT_STRING;
import static io.undertow.util.Headers.AUTHORIZATION_STRING;
import static io.undertow.util.Headers.CACHE_CONTROL_STRING;
import static io.undertow.util.Headers.CONNECTION_STRING;
import static io.undertow.util.Headers.CONTENT_LENGTH_STRING;
import static io.undertow.util.Headers.CONTENT_TYPE_STRING;
import static io.undertow.util.Headers.COOKIE_STRING;
import static io.undertow.util.Headers.EXPECT_STRING;
import static io.undertow.util.Headers.FROM_STRING;
import static io.undertow.util.Headers.HOST_STRING;
import static io.undertow.util.Headers.IF_MATCH_STRING;
import static io.undertow.util.Headers.IF_MODIFIED_SINCE_STRING;
import static io.undertow.util.Headers.IF_NONE_MATCH_STRING;
import static io.undertow.util.Headers.IF_RANGE_STRING;
import static io.undertow.util.Headers.IF_UNMODIFIED_SINCE_STRING;
import static io.undertow.util.Headers.MAX_FORWARDS_STRING;
import static io.undertow.util.Headers.ORIGIN_STRING;
import static io.undertow.util.Headers.PRAGMA_STRING;
import static io.undertow.util.Headers.PROXY_AUTHORIZATION_STRING;
import static io.undertow.util.Headers.RANGE_STRING;
import static io.undertow.util.Headers.REFERER_STRING;
import static io.undertow.util.Headers.REFRESH_STRING;
import static io.undertow.util.Headers.SEC_WEB_SOCKET_KEY_STRING;
import static io.undertow.util.Headers.SEC_WEB_SOCKET_VERSION_STRING;
import static io.undertow.util.Headers.SERVER_STRING;
import static io.undertow.util.Headers.SSL_CIPHER_STRING;
import static io.undertow.util.Headers.SSL_CIPHER_USEKEYSIZE_STRING;
import static io.undertow.util.Headers.SSL_CLIENT_CERT_STRING;
import static io.undertow.util.Headers.SSL_SESSION_ID_STRING;
import static io.undertow.util.Headers.STRICT_TRANSPORT_SECURITY_STRING;
import static io.undertow.util.Headers.TRAILER_STRING;
import static io.undertow.util.Headers.TRANSFER_ENCODING_STRING;
import static io.undertow.util.Headers.UPGRADE_STRING;
import static io.undertow.util.Headers.USER_AGENT_STRING;
import static io.undertow.util.Headers.VIA_STRING;
import static io.undertow.util.Headers.WARNING_STRING;
import static io.undertow.util.Methods.CONNECT_STRING;
import static io.undertow.util.Methods.DELETE_STRING;
import static io.undertow.util.Methods.GET_STRING;
import static io.undertow.util.Methods.HEAD_STRING;
import static io.undertow.util.Methods.OPTIONS_STRING;
import static io.undertow.util.Methods.POST_STRING;
import static io.undertow.util.Methods.PUT_STRING;
import static io.undertow.util.Methods.TRACE_STRING;
import static io.undertow.util.Protocols.HTTP_0_9_STRING;
import static io.undertow.util.Protocols.HTTP_1_0_STRING;
import static io.undertow.util.Protocols.HTTP_1_1_STRING;
import static io.undertow.util.Protocols.HTTP_2_0_STRING;
/**
* The basic HTTP parser. The actual parser is a sub class of this class that is generated as part of
* the build process by the {@link io.undertow.annotationprocessor.AbstractParserGenerator} annotation processor.
* <p>
* The actual processor is a state machine, that means that for common header, method, protocol values
* it will return an interned string, rather than creating a new string for each one.
* <p>
*
* @author Stuart Douglas
*/
@HttpParserConfig(methods = {
OPTIONS_STRING,
GET_STRING,
HEAD_STRING,
POST_STRING,
PUT_STRING,
DELETE_STRING,
TRACE_STRING,
CONNECT_STRING},
protocols = {
HTTP_0_9_STRING, HTTP_1_0_STRING, HTTP_1_1_STRING, HTTP_2_0_STRING
},
headers = {
ACCEPT_STRING,
ACCEPT_CHARSET_STRING,
ACCEPT_ENCODING_STRING,
ACCEPT_LANGUAGE_STRING,
ACCEPT_RANGES_STRING,
AUTHORIZATION_STRING,
CACHE_CONTROL_STRING,
COOKIE_STRING,
CONNECTION_STRING,
CONTENT_LENGTH_STRING,
CONTENT_TYPE_STRING,
EXPECT_STRING,
FROM_STRING,
HOST_STRING,
IF_MATCH_STRING,
IF_MODIFIED_SINCE_STRING,
IF_NONE_MATCH_STRING,
IF_RANGE_STRING,
IF_UNMODIFIED_SINCE_STRING,
MAX_FORWARDS_STRING,
ORIGIN_STRING,
PRAGMA_STRING,
PROXY_AUTHORIZATION_STRING,
RANGE_STRING,
REFERER_STRING,
REFRESH_STRING,
SEC_WEB_SOCKET_KEY_STRING,
SEC_WEB_SOCKET_VERSION_STRING,
SERVER_STRING,
SSL_CLIENT_CERT_STRING,
SSL_CIPHER_STRING,
SSL_SESSION_ID_STRING,
SSL_CIPHER_USEKEYSIZE_STRING,
STRICT_TRANSPORT_SECURITY_STRING,
TRAILER_STRING,
TRANSFER_ENCODING_STRING,
UPGRADE_STRING,
USER_AGENT_STRING,
VIA_STRING,
WARNING_STRING
})
public abstract class HttpRequestParser {
private static final byte[] HTTP;
public static final int HTTP_LENGTH;
private final int maxParameters;
private final int maxHeaders;
private final boolean allowEncodedSlash;
private final boolean decode;
private final String charset;
private final int maxCachedHeaderSize;
static {
try {
HTTP = "HTTP/1.".getBytes("ASCII");
HTTP_LENGTH = HTTP.length;
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
}
public HttpRequestParser(OptionMap options) {
maxParameters = options.get(UndertowOptions.MAX_PARAMETERS, UndertowOptions.DEFAULT_MAX_PARAMETERS);
maxHeaders = options.get(UndertowOptions.MAX_HEADERS, UndertowOptions.DEFAULT_MAX_HEADERS);
allowEncodedSlash = options.get(UndertowOptions.ALLOW_ENCODED_SLASH, false);
decode = options.get(UndertowOptions.DECODE_URL, true);
charset = options.get(UndertowOptions.URL_CHARSET, StandardCharsets.UTF_8.name());
maxCachedHeaderSize = options.get(UndertowOptions.MAX_CACHED_HEADER_SIZE, UndertowOptions.DEFAULT_MAX_CACHED_HEADER_SIZE);
}
public static final HttpRequestParser instance(final OptionMap options) {
try {
final Class<?> cls = Class.forName(HttpRequestParser.class.getName() + "$$generated", false, HttpRequestParser.class.getClassLoader());
Constructor<?> ctor = cls.getConstructor(OptionMap.class);
return (HttpRequestParser) ctor.newInstance(options);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public void handle(ByteBuffer buffer, final ParseState currentState, final HttpServerExchange builder) throws BadRequestException {
if (currentState.state == ParseState.VERB) {
//fast path, we assume that it will parse fully so we avoid all the if statements
//fast path HTTP GET requests, basically just assume all requests are get
//and fall out to the state machine if it is not
final int position = buffer.position();
if (buffer.remaining() > 3
&& buffer.get(position) == 'G'
&& buffer.get(position + 1) == 'E'
&& buffer.get(position + 2) == 'T'
&& buffer.get(position + 3) == ' ') {
buffer.position(position + 4);
builder.setRequestMethod(Methods.GET);
currentState.state = ParseState.PATH;
} else {
handleHttpVerb(buffer, currentState, builder);
}
handlePath(buffer, currentState, builder);
boolean failed = false;
if (buffer.remaining() > HTTP_LENGTH + 3) {
int pos = buffer.position();
for (int i = 0; i < HTTP_LENGTH; ++i) {
if (HTTP[i] != buffer.get(pos + i)) {
failed = true;
break;
}
}
if (!failed) {
final byte b = buffer.get(pos + HTTP_LENGTH);
final byte b2 = buffer.get(pos + HTTP_LENGTH + 1);
final byte b3 = buffer.get(pos + HTTP_LENGTH + 2);
if (b2 == '\r' && b3 == '\n') {
if (b == '1') {
builder.setProtocol(Protocols.HTTP_1_1);
buffer.position(pos + HTTP_LENGTH + 3);
currentState.state = ParseState.HEADER;
} else if (b == '0') {
builder.setProtocol(Protocols.HTTP_1_0);
buffer.position(pos + HTTP_LENGTH + 3);
currentState.state = ParseState.HEADER;
} else {
failed = true;
}
} else {
failed = true;
}
}
} else {
failed = true;
}
if (failed) {
handleHttpVersion(buffer, currentState, builder);
handleAfterVersion(buffer, currentState);
}
while (currentState.state != ParseState.PARSE_COMPLETE && buffer.hasRemaining()) {
handleHeader(buffer, currentState, builder);
if (currentState.state == ParseState.HEADER_VALUE) {
handleHeaderValue(buffer, currentState, builder);
}
}
return;
}
handleStateful(buffer, currentState, builder);
}
private void handleStateful(ByteBuffer buffer, ParseState currentState, HttpServerExchange builder) throws BadRequestException {
if (currentState.state == ParseState.PATH) {
handlePath(buffer, currentState, builder);
if (!buffer.hasRemaining()) {
return;
}
}
if (currentState.state == ParseState.QUERY_PARAMETERS) {
handleQueryParameters(buffer, currentState, builder);
if (!buffer.hasRemaining()) {
return;
}
}
if (currentState.state == ParseState.PATH_PARAMETERS) {
handlePathParameters(buffer, currentState, builder);
if (!buffer.hasRemaining()) {
return;
}
}
if (currentState.state == ParseState.VERSION) {
handleHttpVersion(buffer, currentState, builder);
if (!buffer.hasRemaining()) {
return;
}
}
if (currentState.state == ParseState.AFTER_VERSION) {
handleAfterVersion(buffer, currentState);
if (!buffer.hasRemaining()) {
return;
}
}
while (currentState.state != ParseState.PARSE_COMPLETE) {
if (currentState.state == ParseState.HEADER) {
handleHeader(buffer, currentState, builder);
if (!buffer.hasRemaining()) {
return;
}
}
if (currentState.state == ParseState.HEADER_VALUE) {
handleHeaderValue(buffer, currentState, builder);
if (!buffer.hasRemaining()) {
return;
}
}
}
}
abstract void handleHttpVerb(ByteBuffer buffer, final ParseState currentState, final HttpServerExchange builder);
abstract void handleHttpVersion(ByteBuffer buffer, final ParseState currentState, final HttpServerExchange builder);
abstract void handleHeader(ByteBuffer buffer, final ParseState currentState, final HttpServerExchange builder);
/**
* The parse states for parsing the path.
*/
private static final int START = 0;
private static final int FIRST_COLON = 1;
private static final int FIRST_SLASH = 2;
private static final int SECOND_SLASH = 3;
private static final int IN_PATH = 4;
private static final int HOST_DONE = 5;
/**
* Parses a path value
*
* @param buffer The buffer
* @param state The current state
* @param exchange The exchange builder
* @return The number of bytes remaining
*/
@SuppressWarnings("unused")
final void handlePath(ByteBuffer buffer, ParseState state, HttpServerExchange exchange) throws BadRequestException {
StringBuilder stringBuilder = state.stringBuilder;
int parseState = state.parseState;
int canonicalPathStart = state.pos;
boolean urlDecodeRequired = state.urlDecodeRequired;
while (buffer.hasRemaining()) {
char next = (char) (buffer.get() & 0xFF);
if (next == ' ' || next == '\t') {
if (stringBuilder.length() != 0) {
final String path = stringBuilder.toString();
if(parseState == SECOND_SLASH) {
exchange.setRequestPath("/");
exchange.setRelativePath("/");
exchange.setRequestURI(path);
} else if (parseState < HOST_DONE) {
String decodedPath = decode(path, urlDecodeRequired, state, allowEncodedSlash);
exchange.setRequestPath(decodedPath);
exchange.setRelativePath(decodedPath);
exchange.setRequestURI(path);
} else {
handleFullUrl(state, exchange, canonicalPathStart, urlDecodeRequired, path);
}
exchange.setQueryString("");
state.state = ParseState.VERSION;
state.stringBuilder.setLength(0);
state.parseState = 0;
state.pos = 0;
state.urlDecodeRequired = false;
return;
}
} else if (next == '\r' || next == '\n') {
throw UndertowMessages.MESSAGES.failedToParsePath();
} else if (next == '?' && (parseState == START || parseState == HOST_DONE || parseState == IN_PATH)) {
beginQueryParameters(buffer, state, exchange, stringBuilder, parseState, canonicalPathStart, urlDecodeRequired);
return;
} else if (next == ';' && (parseState == START || parseState == HOST_DONE || parseState == IN_PATH)) {
beginPathParameters(state, exchange, stringBuilder, parseState, canonicalPathStart, urlDecodeRequired);
handlePathParameters(buffer, state, exchange);
return;
} else {
if (decode && (next == '%' || next > 127)) {
urlDecodeRequired = true;
} else if (next == ':' && parseState == START) {
parseState = FIRST_COLON;
} else if (next == '/' && parseState == FIRST_COLON) {
parseState = FIRST_SLASH;
} else if (next == '/' && parseState == FIRST_SLASH) {
parseState = SECOND_SLASH;
} else if (next == '/' && parseState == SECOND_SLASH) {
parseState = HOST_DONE;
canonicalPathStart = stringBuilder.length();
} else if (parseState == FIRST_COLON || parseState == FIRST_SLASH) {
parseState = IN_PATH;
} else if (next == '/' && parseState != HOST_DONE) {
parseState = IN_PATH;
}
stringBuilder.append(next);
}
}
state.parseState = parseState;
state.pos = canonicalPathStart;
state.urlDecodeRequired = urlDecodeRequired;
}
private void beginPathParameters(ParseState state, HttpServerExchange exchange, StringBuilder stringBuilder, int parseState, int canonicalPathStart, boolean urlDecodeRequired) {
final String path = stringBuilder.toString();
if(parseState == SECOND_SLASH) {
exchange.setRequestPath("/");
exchange.setRelativePath("/");
exchange.setRequestURI(path);
} else if (parseState < HOST_DONE) {
String decodedPath = decode(path, urlDecodeRequired, state, allowEncodedSlash);
exchange.setRequestPath(decodedPath);
exchange.setRelativePath(decodedPath);
exchange.setRequestURI(path);
} else {
String thePath = path.substring(canonicalPathStart);
exchange.setRequestPath(thePath);
exchange.setRelativePath(thePath);
exchange.setRequestURI(path, true);
}
state.state = ParseState.PATH_PARAMETERS;
state.stringBuilder.setLength(0);
state.parseState = 0;
state.pos = 0;
state.urlDecodeRequired = false;
}
private void beginQueryParameters(ByteBuffer buffer, ParseState state, HttpServerExchange exchange, StringBuilder stringBuilder, int parseState, int canonicalPathStart, boolean urlDecodeRequired) throws BadRequestException {
final String path = stringBuilder.toString();
if (parseState == SECOND_SLASH) {
exchange.setRequestPath("/");
exchange.setRelativePath("/");
exchange.setRequestURI(path);
} else if (parseState < HOST_DONE) {
String decodedPath = decode(path, urlDecodeRequired, state, allowEncodedSlash);
exchange.setRequestPath(decodedPath);
exchange.setRelativePath(decodedPath);
exchange.setRequestURI(path, false);
} else {
handleFullUrl(state, exchange, canonicalPathStart, urlDecodeRequired, path);
}
state.state = ParseState.QUERY_PARAMETERS;
state.stringBuilder.setLength(0);
state.parseState = 0;
state.pos = 0;
state.urlDecodeRequired = false;
handleQueryParameters(buffer, state, exchange);
}
private void handleFullUrl(ParseState state, HttpServerExchange exchange, int canonicalPathStart, boolean urlDecodeRequired, String path) {
String thePath = decode(path.substring(canonicalPathStart), urlDecodeRequired, state, allowEncodedSlash);
exchange.setRequestPath(thePath);
exchange.setRelativePath(thePath);
exchange.setRequestURI(path, true);
}
/**
* Parses a path value
*
* @param buffer The buffer
* @param state The current state
* @param exchange The exchange builder
* @return The number of bytes remaining
*/
@SuppressWarnings("unused")
final void handleQueryParameters(ByteBuffer buffer, ParseState state, HttpServerExchange exchange) throws BadRequestException {
StringBuilder stringBuilder = state.stringBuilder;
int queryParamPos = state.pos;
int mapCount = state.mapCount;
boolean urlDecodeRequired = state.urlDecodeRequired;
String nextQueryParam = state.nextQueryParam;
//so this is a bit funky, because it not only deals with parsing, but
//also deals with URL decoding the query parameters as well, while also
//maintaining a non-decoded version to use as the query string
//In most cases these string will be the same, and as we do not want to
//build up two separate strings we don't use encodedStringBuilder unless
//we encounter an encoded character
while (buffer.hasRemaining()) {
char next = (char) (buffer.get() & 0xFF);
if (next == ' ' || next == '\t') {
final String queryString = stringBuilder.toString();
exchange.setQueryString(queryString);
if (nextQueryParam == null) {
if (queryParamPos != stringBuilder.length()) {
exchange.addQueryParam(decode(stringBuilder.substring(queryParamPos), urlDecodeRequired, state, true), "");
}
} else {
exchange.addQueryParam(nextQueryParam, decode(stringBuilder.substring(queryParamPos), urlDecodeRequired, state, true));
}
state.state = ParseState.VERSION;
state.stringBuilder.setLength(0);
state.pos = 0;
state.nextQueryParam = null;
state.urlDecodeRequired = false;
state.mapCount = 0;
return;
} else if (next == '\r' || next == '\n') {
throw UndertowMessages.MESSAGES.failedToParsePath();
} else {
if (decode && (next == '+' || next == '%' || next > 127)) { //+ is only a whitespace substitute in the query part of the URL
urlDecodeRequired = true;
} else if (next == '=' && nextQueryParam == null) {
nextQueryParam = decode(stringBuilder.substring(queryParamPos), urlDecodeRequired, state, true);
urlDecodeRequired = false;
queryParamPos = stringBuilder.length() + 1;
} else if (next == '&' && nextQueryParam == null) {
if (++mapCount >= maxParameters) {
throw UndertowMessages.MESSAGES.tooManyQueryParameters(maxParameters);
}
if (queryParamPos != stringBuilder.length()) {
exchange.addQueryParam(decode(stringBuilder.substring(queryParamPos), urlDecodeRequired, state, true), "");
}
urlDecodeRequired = false;
queryParamPos = stringBuilder.length() + 1;
} else if (next == '&') {
if (++mapCount >= maxParameters) {
throw UndertowMessages.MESSAGES.tooManyQueryParameters(maxParameters);
}
exchange.addQueryParam(nextQueryParam, decode(stringBuilder.substring(queryParamPos), urlDecodeRequired, state, true));
urlDecodeRequired = false;
queryParamPos = stringBuilder.length() + 1;
nextQueryParam = null;
}
stringBuilder.append(next);
}
}
state.pos = queryParamPos;
state.nextQueryParam = nextQueryParam;
state.urlDecodeRequired = urlDecodeRequired;
state.mapCount = mapCount;
}
private String decode(final String value, boolean urlDecodeRequired, ParseState state, final boolean allowEncodedSlash) {
if (urlDecodeRequired) {
return URLUtils.decode(value, charset, allowEncodedSlash, state.decodeBuffer);
} else {
return value;
}
}
final void handlePathParameters(ByteBuffer buffer, ParseState state, HttpServerExchange exchange) throws BadRequestException {
StringBuilder stringBuilder = state.stringBuilder;
int queryParamPos = state.pos;
int mapCount = state.mapCount;
boolean urlDecodeRequired = state.urlDecodeRequired;
String nextQueryParam = state.nextQueryParam;
//so this is a bit funky, because it not only deals with parsing, but
//also deals with URL decoding the query parameters as well, while also
//maintaining a non-decoded version to use as the query string
//In most cases these string will be the same, and as we do not want to
//build up two separate strings we don't use encodedStringBuilder unless
//we encounter an encoded character
while (buffer.hasRemaining()) {
char next = (char) (buffer.get() & 0xFF);
if (next == ' ' || next == '\t' || next == '?') {
if (nextQueryParam == null) {
if (queryParamPos != stringBuilder.length()) {
exchange.addPathParam(decode(stringBuilder.substring(queryParamPos), urlDecodeRequired, state, true), "");
}
} else {
exchange.addPathParam(nextQueryParam, decode(stringBuilder.substring(queryParamPos), urlDecodeRequired, state, true));
}
exchange.setRequestURI(exchange.getRequestURI() + ';' + stringBuilder.toString(), state.parseState > HOST_DONE);
state.stringBuilder.setLength(0);
state.pos = 0;
state.nextQueryParam = null;
state.mapCount = 0;
state.urlDecodeRequired = false;
if (next == '?') {
state.state = ParseState.QUERY_PARAMETERS;
handleQueryParameters(buffer, state, exchange);
} else {
state.state = ParseState.VERSION;
}
return;
} else if (next == '\r' || next == '\n') {
throw UndertowMessages.MESSAGES.failedToParsePath();
} else {
if (decode && (next == '+' || next == '%' || next > 127)) {
urlDecodeRequired = true;
}
if (next == '=' && nextQueryParam == null) {
nextQueryParam = decode(stringBuilder.substring(queryParamPos), urlDecodeRequired, state, true);
urlDecodeRequired = false;
queryParamPos = stringBuilder.length() + 1;
} else if (next == '&' && nextQueryParam == null) {
if (++mapCount >= maxParameters) {
throw UndertowMessages.MESSAGES.tooManyQueryParameters(maxParameters);
}
exchange.addPathParam(decode(stringBuilder.substring(queryParamPos), urlDecodeRequired, state, true), "");
urlDecodeRequired = false;
queryParamPos = stringBuilder.length() + 1;
} else if (next == '&') {
if (++mapCount >= maxParameters) {
throw UndertowMessages.MESSAGES.tooManyQueryParameters(maxParameters);
}
exchange.addPathParam(nextQueryParam, decode(stringBuilder.substring(queryParamPos), urlDecodeRequired, state, true));
urlDecodeRequired = false;
queryParamPos = stringBuilder.length() + 1;
nextQueryParam = null;
}
stringBuilder.append(next);
}
}
state.pos = queryParamPos;
state.nextQueryParam = nextQueryParam;
state.mapCount = mapCount;
state.urlDecodeRequired = urlDecodeRequired;
}
/**
* The parse states for parsing heading values
*/
private static final int NORMAL = 0;
private static final int WHITESPACE = 1;
private static final int BEGIN_LINE_END = 2;
private static final int LINE_END = 3;
private static final int AWAIT_DATA_END = 4;
/**
* Parses a header value. This is called from the generated bytecode.
*
* @param buffer The buffer
* @param state The current state
* @param builder The exchange builder
* @return The number of bytes remaining
*/
@SuppressWarnings("unused")
final void handleHeaderValue(ByteBuffer buffer, ParseState state, HttpServerExchange builder) throws BadRequestException {
HttpString headerName = state.nextHeader;
StringBuilder stringBuilder = state.stringBuilder;
CacheMap<HttpString, String> headerValuesCache = state.headerValuesCache;
if (headerName != null && stringBuilder.length() == 0 && headerValuesCache != null) {
String existing = headerValuesCache.get(headerName);
if (existing != null) {
if (handleCachedHeader(existing, buffer, state, builder)) {
return;
}
}
}
handleHeaderValueCacheMiss(buffer, state, builder, headerName, headerValuesCache, stringBuilder);
}
private void handleHeaderValueCacheMiss(ByteBuffer buffer, ParseState state, HttpServerExchange builder, HttpString headerName, CacheMap<HttpString, String> headerValuesCache, StringBuilder stringBuilder) throws BadRequestException {
int parseState = state.parseState;
while (buffer.hasRemaining() && parseState == NORMAL) {
final byte next = buffer.get();
if (next == '\r') {
parseState = BEGIN_LINE_END;
} else if (next == '\n') {
parseState = LINE_END;
} else if (next == ' ' || next == '\t') {
parseState = WHITESPACE;
} else {
stringBuilder.append((char) (next & 0xFF));
}
}
while (buffer.hasRemaining()) {
final byte next = buffer.get();
switch (parseState) {
case NORMAL: {
if (next == '\r') {
parseState = BEGIN_LINE_END;
} else if (next == '\n') {
parseState = LINE_END;
} else if (next == ' ' || next == '\t') {
parseState = WHITESPACE;
} else {
stringBuilder.append((char) (next & 0xFF));
}
break;
}
case WHITESPACE: {
if (next == '\r') {
parseState = BEGIN_LINE_END;
} else if (next == '\n') {
parseState = LINE_END;
} else if (next == ' ' || next == '\t') {
} else {
if (stringBuilder.length() > 0) {
stringBuilder.append(' ');
}
stringBuilder.append((char) (next & 0xFF));
parseState = NORMAL;
}
break;
}
case LINE_END:
case BEGIN_LINE_END: {
if (next == '\n' && parseState == BEGIN_LINE_END) {
parseState = LINE_END;
} else if (next == '\t' ||
next == ' ') {
//this is a continuation
parseState = WHITESPACE;
} else {
//we have a header
String headerValue = stringBuilder.toString();
if (++state.mapCount > maxHeaders) {
throw new BadRequestException(UndertowMessages.MESSAGES.tooManyHeaders(maxHeaders));
}
//TODO: we need to decode this according to RFC-2047 if we have seen a =? symbol
builder.getRequestHeaders().add(headerName, headerValue);
if(headerValuesCache != null && headerName.length() + headerValue.length() < maxCachedHeaderSize) {
headerValuesCache.put(headerName, headerValue);
}
state.nextHeader = null;
state.leftOver = next;
state.stringBuilder.setLength(0);
if (next == '\r') {
parseState = AWAIT_DATA_END;
} else if (next == '\n') {
state.state = ParseState.PARSE_COMPLETE;
return;
} else {
state.state = ParseState.HEADER;
state.parseState = 0;
return;
}
}
break;
}
case AWAIT_DATA_END: {
state.state = ParseState.PARSE_COMPLETE;
return;
}
}
}
//we only write to the state if we did not finish parsing
state.parseState = parseState;
}
protected boolean handleCachedHeader(String existing, ByteBuffer buffer, ParseState state, HttpServerExchange builder) throws BadRequestException {
int pos = buffer.position();
while (pos < buffer.limit() && buffer.get(pos) == ' ') {
pos++;
}
if (existing.length() + 3 + pos > buffer.limit()) {
return false;
}
int i = 0;
while (i < existing.length()) {
byte b = buffer.get(pos + i);
if (b != existing.charAt(i)) {
return false;
}
++i;
}
if (buffer.get(pos + i++) != '\r') {
return false;
}
if (buffer.get(pos + i++) != '\n') {
return false;
}
int next = buffer.get(pos + i);
if (next == '\t' || next == ' ') {
//continuation
return false;
}
buffer.position(pos + i);
if (++state.mapCount > maxHeaders) {
throw new BadRequestException(UndertowMessages.MESSAGES.tooManyHeaders(maxHeaders));
}
//TODO: we need to decode this according to RFC-2047 if we have seen a =? symbol
builder.getRequestHeaders().add(state.nextHeader, existing);
state.nextHeader = null;
state.state = ParseState.HEADER;
state.parseState = 0;
return true;
}
protected void handleAfterVersion(ByteBuffer buffer, ParseState state) throws BadRequestException {
boolean newLine = state.leftOver == '\n';
while (buffer.hasRemaining()) {
final byte next = buffer.get();
if (newLine) {
if (next == '\n') {
state.state = ParseState.PARSE_COMPLETE;
return;
} else {
state.state = ParseState.HEADER;
state.leftOver = next;
return;
}
} else {
if (next == '\n') {
newLine = true;
} else if (next != '\r' && next != ' ' && next != '\t') {
state.state = ParseState.HEADER;
state.leftOver = next;
return;
} else {
throw UndertowMessages.MESSAGES.badRequest();
}
}
}
if (newLine) {
state.leftOver = '\n';
}
}
/**
* This is a bit of hack to enable the parser to get access to the HttpString's that are sorted
* in the static fields of the relevant classes. This means that in most cases a HttpString comparison
* will take the fast path == route, as they will be the same object
*
* @return
*/
@SuppressWarnings("unused")
protected static Map<String, HttpString> httpStrings() {
final Map<String, HttpString> results = new HashMap<>();
final Class[] classs = {Headers.class, Methods.class, Protocols.class};
for (Class<?> c : classs) {
for (Field field : c.getDeclaredFields()) {
if (field.getType().equals(HttpString.class)) {
HttpString result = null;
try {
result = (HttpString) field.get(null);
results.put(result.toString(), result);
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
}
}
}
}
return results;
}
}