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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you 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 org.elasticsearch.rest;
import org.apache.lucene.util.SetOnce;
import org.elasticsearch.ElasticsearchParseException;
import org.elasticsearch.common.Booleans;
import org.elasticsearch.common.CheckedConsumer;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.bytes.BytesArray;
import org.elasticsearch.common.bytes.BytesReference;
import org.elasticsearch.common.collect.Tuple;
import org.elasticsearch.common.unit.ByteSizeValue;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.common.xcontent.LoggingDeprecationHandler;
import org.elasticsearch.common.xcontent.NamedXContentRegistry;
import org.elasticsearch.common.xcontent.ToXContent;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.http.HttpChannel;
import org.elasticsearch.http.HttpRequest;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
import static org.elasticsearch.common.unit.ByteSizeValue.parseBytesSizeValue;
import static org.elasticsearch.common.unit.TimeValue.parseTimeValue;
public class RestRequest implements ToXContent.Params {
// tchar pattern as defined by RFC7230 section 3.2.6
private static final Pattern TCHAR_PATTERN = Pattern.compile("[a-zA-z0-9!#$%&'*+\\-.\\^_`|~]+");
private final NamedXContentRegistry xContentRegistry;
private final Map params;
private final Map> headers;
private final String rawPath;
private final Set consumedParams = new HashSet<>();
private final SetOnce xContentType = new SetOnce<>();
private final HttpChannel httpChannel;
private HttpRequest httpRequest;
private boolean contentConsumed = false;
public boolean isContentConsumed() {
return contentConsumed;
}
protected RestRequest(NamedXContentRegistry xContentRegistry, Map params, String path,
Map> headers, HttpRequest httpRequest, HttpChannel httpChannel) {
final XContentType xContentType;
try {
xContentType = parseContentType(headers.get("Content-Type"));
} catch (final IllegalArgumentException e) {
throw new ContentTypeHeaderException(e);
}
if (xContentType != null) {
this.xContentType.set(xContentType);
}
this.xContentRegistry = xContentRegistry;
this.httpRequest = httpRequest;
this.httpChannel = httpChannel;
this.params = params;
this.rawPath = path;
this.headers = Collections.unmodifiableMap(headers);
}
protected RestRequest(RestRequest restRequest) {
this(restRequest.getXContentRegistry(), restRequest.params(), restRequest.path(), restRequest.getHeaders(),
restRequest.getHttpRequest(), restRequest.getHttpChannel());
}
/**
* Invoke {@link HttpRequest#releaseAndCopy()} on the http request in this instance and replace a pooled http request
* with an unpooled copy. This is supposed to be used before passing requests to {@link RestHandler} instances that can not safely
* handle http requests that use pooled buffers as determined by {@link RestHandler#allowsUnsafeBuffers()}.
*/
void ensureSafeBuffers() {
httpRequest = httpRequest.releaseAndCopy();
}
/**
* Creates a new REST request. This method will throw {@link BadParameterException} if the path cannot be
* decoded
*
* @param xContentRegistry the content registry
* @param httpRequest the http request
* @param httpChannel the http channel
* @throws BadParameterException if the parameters can not be decoded
* @throws ContentTypeHeaderException if the Content-Type header can not be parsed
*/
public static RestRequest request(NamedXContentRegistry xContentRegistry, HttpRequest httpRequest, HttpChannel httpChannel) {
Map params = params(httpRequest.uri());
String path = path(httpRequest.uri());
return new RestRequest(xContentRegistry, params, path, httpRequest.getHeaders(), httpRequest, httpChannel);
}
private static Map params(final String uri) {
final Map params = new HashMap<>();
int index = uri.indexOf('?');
if (index >= 0) {
try {
RestUtils.decodeQueryString(uri, index + 1, params);
} catch (final IllegalArgumentException e) {
throw new BadParameterException(e);
}
}
return params;
}
private static String path(final String uri) {
final int index = uri.indexOf('?');
if (index >= 0) {
return uri.substring(0, index);
} else {
return uri;
}
}
/**
* Creates a new REST request. The path is not decoded so this constructor will not throw a
* {@link BadParameterException}.
*
* @param xContentRegistry the content registry
* @param httpRequest the http request
* @param httpChannel the http channel
* @throws ContentTypeHeaderException if the Content-Type header can not be parsed
*/
public static RestRequest requestWithoutParameters(NamedXContentRegistry xContentRegistry, HttpRequest httpRequest,
HttpChannel httpChannel) {
Map params = Collections.emptyMap();
return new RestRequest(xContentRegistry, params, httpRequest.uri(), httpRequest.getHeaders(), httpRequest, httpChannel);
}
public enum Method {
GET, POST, PUT, DELETE, OPTIONS, HEAD, PATCH, TRACE, CONNECT
}
/**
* Returns the HTTP method used in the REST request.
*
* @return the {@link Method} used in the REST request
* @throws IllegalArgumentException if the HTTP method is invalid
*/
public Method method() {
return httpRequest.method();
}
/**
* The uri of the rest request, with the query string.
*/
public String uri() {
return httpRequest.uri();
}
/**
* The non decoded, raw path provided.
*/
public String rawPath() {
return rawPath;
}
/**
* The path part of the URI (without the query string), decoded.
*/
public final String path() {
return RestUtils.decodeComponent(rawPath());
}
public boolean hasContent() {
return content(false).length() > 0;
}
public BytesReference content() {
return content(true);
}
protected BytesReference content(final boolean contentConsumed) {
this.contentConsumed = this.contentConsumed | contentConsumed;
return httpRequest.content();
}
/**
* @return content of the request body or throw an exception if the body or content type is missing
*/
public final BytesReference requiredContent() {
if (hasContent() == false) {
throw new ElasticsearchParseException("request body is required");
} else if (xContentType.get() == null) {
throw new IllegalStateException("unknown content type");
}
return content();
}
/**
* Get the value of the header or {@code null} if not found. This method only retrieves the first header value if multiple values are
* sent. Use of {@link #getAllHeaderValues(String)} should be preferred
*/
public final String header(String name) {
List values = headers.get(name);
if (values != null && values.isEmpty() == false) {
return values.get(0);
}
return null;
}
/**
* Get all values for the header or {@code null} if the header was not found
*/
public final List getAllHeaderValues(String name) {
List values = headers.get(name);
if (values != null) {
return Collections.unmodifiableList(values);
}
return null;
}
/**
* Get all of the headers and values associated with the headers. Modifications of this map are not supported.
*/
public final Map> getHeaders() {
return headers;
}
/**
* The {@link XContentType} that was parsed from the {@code Content-Type} header. This value will be {@code null} in the case of
* a request without a valid {@code Content-Type} header, a request without content ({@link #hasContent()}, or a plain text request
*/
@Nullable
public final XContentType getXContentType() {
return xContentType.get();
}
public HttpChannel getHttpChannel() {
return httpChannel;
}
public HttpRequest getHttpRequest() {
return httpRequest;
}
public final boolean hasParam(String key) {
return params.containsKey(key);
}
@Override
public final String param(String key) {
consumedParams.add(key);
return params.get(key);
}
@Override
public final String param(String key, String defaultValue) {
consumedParams.add(key);
String value = params.get(key);
if (value == null) {
return defaultValue;
}
return value;
}
public Map params() {
return params;
}
/**
* Returns a list of parameters that have been consumed. This method returns a copy, callers
* are free to modify the returned list.
*
* @return the list of currently consumed parameters.
*/
List consumedParams() {
return new ArrayList<>(consumedParams);
}
/**
* Returns a list of parameters that have not yet been consumed. This method returns a copy,
* callers are free to modify the returned list.
*
* @return the list of currently unconsumed parameters.
*/
List unconsumedParams() {
return params
.keySet()
.stream()
.filter(p -> !consumedParams.contains(p))
.collect(Collectors.toList());
}
public float paramAsFloat(String key, float defaultValue) {
String sValue = param(key);
if (sValue == null) {
return defaultValue;
}
try {
return Float.parseFloat(sValue);
} catch (NumberFormatException e) {
throw new IllegalArgumentException("Failed to parse float parameter [" + key + "] with value [" + sValue + "]", e);
}
}
public int paramAsInt(String key, int defaultValue) {
String sValue = param(key);
if (sValue == null) {
return defaultValue;
}
try {
return Integer.parseInt(sValue);
} catch (NumberFormatException e) {
throw new IllegalArgumentException("Failed to parse int parameter [" + key + "] with value [" + sValue + "]", e);
}
}
public long paramAsLong(String key, long defaultValue) {
String sValue = param(key);
if (sValue == null) {
return defaultValue;
}
try {
return Long.parseLong(sValue);
} catch (NumberFormatException e) {
throw new IllegalArgumentException("Failed to parse long parameter [" + key + "] with value [" + sValue + "]", e);
}
}
@Override
public boolean paramAsBoolean(String key, boolean defaultValue) {
String rawParam = param(key);
// Treat empty string as true because that allows the presence of the url parameter to mean "turn this on"
if (rawParam != null && rawParam.length() == 0) {
return true;
} else {
return Booleans.parseBoolean(rawParam, defaultValue);
}
}
@Override
public Boolean paramAsBoolean(String key, Boolean defaultValue) {
return Booleans.parseBoolean(param(key), defaultValue);
}
public TimeValue paramAsTime(String key, TimeValue defaultValue) {
return parseTimeValue(param(key), defaultValue, key);
}
public ByteSizeValue paramAsSize(String key, ByteSizeValue defaultValue) {
return parseBytesSizeValue(param(key), defaultValue, key);
}
public String[] paramAsStringArray(String key, String[] defaultValue) {
String value = param(key);
if (value == null) {
return defaultValue;
}
return Strings.splitStringByCommaToArray(value);
}
public String[] paramAsStringArrayOrEmptyIfAll(String key) {
String[] params = paramAsStringArray(key, Strings.EMPTY_ARRAY);
if (Strings.isAllOrWildcard(params)) {
return Strings.EMPTY_ARRAY;
}
return params;
}
/**
* Get the {@link NamedXContentRegistry} that should be used to create parsers from this request.
*/
public NamedXContentRegistry getXContentRegistry() {
return xContentRegistry;
}
/**
* A parser for the contents of this request if there is a body, otherwise throws an {@link ElasticsearchParseException}. Use
* {@link #applyContentParser(CheckedConsumer)} if you want to gracefully handle when the request doesn't have any contents. Use
* {@link #contentOrSourceParamParser()} for requests that support specifying the request body in the {@code source} param.
*/
public final XContentParser contentParser() throws IOException {
BytesReference content = requiredContent(); // will throw exception if body or content type missing
return xContentType.get().xContent().createParser(xContentRegistry, LoggingDeprecationHandler.INSTANCE, content.streamInput());
}
/**
* If there is any content then call {@code applyParser} with the parser, otherwise do nothing.
*/
public final void applyContentParser(CheckedConsumer applyParser) throws IOException {
if (hasContent()) {
try (XContentParser parser = contentParser()) {
applyParser.accept(parser);
}
}
}
/**
* Does this request have content or a {@code source} parameter? Use this instead of {@link #hasContent()} if this
* {@linkplain RestHandler} treats the {@code source} parameter like the body content.
*/
public final boolean hasContentOrSourceParam() {
return hasContent() || hasParam("source");
}
/**
* A parser for the contents of this request if it has contents, otherwise a parser for the {@code source} parameter if there is one,
* otherwise throws an {@link ElasticsearchParseException}. Use {@link #withContentOrSourceParamParserOrNull(CheckedConsumer)} instead
* if you need to handle the absence request content gracefully.
*/
public final XContentParser contentOrSourceParamParser() throws IOException {
Tuple tuple = contentOrSourceParam();
return tuple.v1().xContent().createParser(xContentRegistry, LoggingDeprecationHandler.INSTANCE, tuple.v2().streamInput());
}
/**
* Call a consumer with the parser for the contents of this request if it has contents, otherwise with a parser for the {@code source}
* parameter if there is one, otherwise with {@code null}. Use {@link #contentOrSourceParamParser()} if you should throw an exception
* back to the user when there isn't request content.
*/
public final void withContentOrSourceParamParserOrNull(CheckedConsumer withParser) throws IOException {
if (hasContentOrSourceParam()) {
Tuple tuple = contentOrSourceParam();
BytesReference content = tuple.v2();
XContentType xContentType = tuple.v1();
try (InputStream stream = content.streamInput();
XContentParser parser = xContentType.xContent()
.createParser(xContentRegistry, LoggingDeprecationHandler.INSTANCE, stream)) {
withParser.accept(parser);
}
} else {
withParser.accept(null);
}
}
/**
* Get the content of the request or the contents of the {@code source} param or throw an exception if both are missing.
* Prefer {@link #contentOrSourceParamParser()} or {@link #withContentOrSourceParamParserOrNull(CheckedConsumer)} if you need a parser.
*/
public final Tuple contentOrSourceParam() {
if (hasContentOrSourceParam() == false) {
throw new ElasticsearchParseException("request body or source parameter is required");
} else if (hasContent()) {
return new Tuple<>(xContentType.get(), requiredContent());
}
String source = param("source");
String typeParam = param("source_content_type");
if (source == null || typeParam == null) {
throw new IllegalStateException("source and source_content_type parameters are required");
}
BytesArray bytes = new BytesArray(source);
final XContentType xContentType = parseContentType(Collections.singletonList(typeParam));
if (xContentType == null) {
throw new IllegalStateException("Unknown value for source_content_type [" + typeParam + "]");
}
return new Tuple<>(xContentType, bytes);
}
/**
* Parses the given content type string for the media type. This method currently ignores parameters.
*/
// TODO stop ignoring parameters such as charset...
public static XContentType parseContentType(List header) {
if (header == null || header.isEmpty()) {
return null;
} else if (header.size() > 1) {
throw new IllegalArgumentException("only one Content-Type header should be provided");
}
String rawContentType = header.get(0);
final String[] elements = rawContentType.split("[ \t]*;");
if (elements.length > 0) {
final String[] splitMediaType = elements[0].split("/");
if (splitMediaType.length == 2 && TCHAR_PATTERN.matcher(splitMediaType[0]).matches()
&& TCHAR_PATTERN.matcher(splitMediaType[1].trim()).matches()) {
return XContentType.fromMediaType(elements[0]);
} else {
throw new IllegalArgumentException("invalid Content-Type header [" + rawContentType + "]");
}
}
throw new IllegalArgumentException("empty Content-Type header");
}
public static class ContentTypeHeaderException extends RuntimeException {
ContentTypeHeaderException(final IllegalArgumentException cause) {
super(cause);
}
}
public static class BadParameterException extends RuntimeException {
BadParameterException(final IllegalArgumentException cause) {
super(cause);
}
}
}