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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.NamedXContentRegistry;
import org.elasticsearch.common.xcontent.ToXContent;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.common.xcontent.XContentType;
import java.io.IOException;
import java.net.SocketAddress;
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 abstract 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<String, String> params;
private final Map<String, List<String>> headers;
private final String rawPath;
private final Set<String> consumedParams = new HashSet<>();
private final SetOnce<XContentType> xContentType = new SetOnce<>();
/**
* Creates a new RestRequest
* @param xContentRegistry the xContentRegistry to use when parsing XContent
* @param uri the URI of the request that potentially contains request parameters
* @param headers a map of the headers. This map should implement a Case-Insensitive hashing for keys as HTTP header names are case
* insensitive
*/
public RestRequest(NamedXContentRegistry xContentRegistry, String uri, Map<String, List<String>> headers) {
this.xContentRegistry = xContentRegistry;
final Map<String, String> params = new HashMap<>();
int pathEndPos = uri.indexOf('?');
if (pathEndPos < 0) {
this.rawPath = uri;
} else {
this.rawPath = uri.substring(0, pathEndPos);
RestUtils.decodeQueryString(uri, pathEndPos + 1, params);
}
this.params = params;
this.headers = Collections.unmodifiableMap(headers);
final List<String> contentType = getAllHeaderValues("Content-Type");
final XContentType xContentType = parseContentType(contentType);
if (xContentType != null) {
this.xContentType.set(xContentType);
}
}
/**
* Creates a new RestRequest
* @param xContentRegistry the xContentRegistry to use when parsing XContent
* @param params the parameters of the request
* @param path the path of the request. This should not contain request parameters
* @param headers a map of the headers. This map should implement a Case-Insensitive hashing for keys as HTTP header names are case
* insensitive
*/
public RestRequest(NamedXContentRegistry xContentRegistry, Map<String, String> params, String path, Map<String, List<String>> headers) {
this.xContentRegistry = xContentRegistry;
this.params = params;
this.rawPath = path;
this.headers = Collections.unmodifiableMap(headers);
final List<String> contentType = getAllHeaderValues("Content-Type");
final XContentType xContentType = parseContentType(contentType);
if (xContentType != null) {
this.xContentType.set(xContentType);
}
}
public enum Method {
GET, POST, PUT, DELETE, OPTIONS, HEAD
}
public abstract Method method();
/**
* The uri of the rest request, with the query string.
*/
public abstract String 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 abstract boolean hasContent();
public abstract BytesReference 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<String> 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<String> getAllHeaderValues(String name) {
List<String> 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<String, List<String>> 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();
}
/**
* Sets the {@link XContentType}
*/
final void setXContentType(XContentType xContentType) {
this.xContentType.set(xContentType);
}
@Nullable
public SocketAddress getRemoteAddress() {
return null;
}
@Nullable
public SocketAddress getLocalAddress() {
return null;
}
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<String, String> 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<String> consumedParams() {
return consumedParams.stream().collect(Collectors.toList());
}
/**
* 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<String> 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 = content();
if (content.length() == 0) {
throw new ElasticsearchParseException("Body required");
} else if (xContentType.get() == null) {
throw new IllegalStateException("unknown content type");
}
return xContentType.get().xContent().createParser(xContentRegistry, content);
}
/**
* If there is any content then call {@code applyParser} with the parser, otherwise do nothing.
*/
public final void applyContentParser(CheckedConsumer<XContentParser, IOException> 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<XContentType, BytesReference> tuple = contentOrSourceParam();
BytesReference content = tuple.v2();
if (content.length() == 0) {
throw new ElasticsearchParseException("Body required");
}
return tuple.v1().xContent().createParser(xContentRegistry, content);
}
/**
* 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<XContentParser, IOException> withParser) throws IOException {
Tuple<XContentType, BytesReference> tuple = contentOrSourceParam();
BytesReference content = tuple.v2();
XContentType xContentType = tuple.v1();
if (content.length() > 0) {
try (XContentParser parser = xContentType.xContent().createParser(xContentRegistry, content)) {
withParser.accept(parser);
}
} else {
withParser.accept(null);
}
}
/**
* Get the content of the request or the contents of the {@code source} param. Prefer {@link #contentOrSourceParamParser()} or
* {@link #withContentOrSourceParamParserOrNull(CheckedConsumer)} if you need a parser.
*/
public final Tuple<XContentType, BytesReference> contentOrSourceParam() {
if (hasContent()) {
if (xContentType.get() == null) {
throw new IllegalStateException("unknown content type");
}
return new Tuple<>(xContentType.get(), content());
}
String source = param("source");
String typeParam = param("source_content_type");
if (source != null && typeParam != null) {
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);
}
return new Tuple<>(XContentType.JSON, BytesArray.EMPTY);
}
/**
* Parses the given content type string for the media type. This method currently ignores parameters.
*/
// TODO stop ignoring parameters such as charset...
private static XContentType parseContentType(List<String> 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");
}
}