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/*
* Copyright 2002-2019 the original author or authors.
*
* 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
*
* https://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.springframework.http.server;
import java.util.List;
import org.springframework.util.MultiValueMap;
/**
* Structured representation of a URI path parsed via {@link #parsePath(String)}
* into a sequence of {@link Separator} and {@link PathSegment} elements.
*
* Each {@link PathSegment} exposes its content in decoded form and with path
* parameters removed. This makes it safe to match one path segment at a time
* without the risk of decoded reserved characters altering the structure of
* the path.
*
* @author Rossen Stoyanchev
* @since 5.0
*/
public interface PathContainer {
/**
* The original path from which this instance was parsed.
*/
String value();
/**
* The contained path elements, either {@link Separator} or {@link PathSegment}.
*/
List elements();
/**
* Extract a sub-path from the given offset into the elements list.
* @param index the start element index (inclusive)
* @return the sub-path
*/
default PathContainer subPath(int index) {
return subPath(index, elements().size());
}
/**
* Extract a sub-path from the given start offset into the element list
* (inclusive) and to the end offset (exclusive).
* @param startIndex the start element index (inclusive)
* @param endIndex the end element index (exclusive)
* @return the sub-path
*/
default PathContainer subPath(int startIndex, int endIndex) {
return DefaultPathContainer.subPath(this, startIndex, endIndex);
}
/**
* Parse the path value into a sequence of {@code "/"} {@link Separator Separator}
* and {@link PathSegment PathSegment} elements.
* @param path the encoded, raw path value to parse
* @return the parsed path
*/
static PathContainer parsePath(String path) {
return DefaultPathContainer.createFromUrlPath(path, Options.HTTP_PATH);
}
/**
* Parse the path value into a sequence of {@link Separator Separator} and
* {@link PathSegment PathSegment} elements.
* @param path the encoded, raw path value to parse
* @param options to customize parsing
* @return the parsed path
* @since 5.2
*/
static PathContainer parsePath(String path, Options options) {
return DefaultPathContainer.createFromUrlPath(path, options);
}
/**
* A path element, either separator or path segment.
*/
interface Element {
/**
* The unmodified, original value of this element.
*/
String value();
}
/**
* Path separator element.
*/
interface Separator extends Element {
}
/**
* Path segment element.
*/
interface PathSegment extends Element {
/**
* Return the path segment value, decoded and sanitized, for path matching.
*/
String valueToMatch();
/**
* Expose {@link #valueToMatch()} as a character array.
*/
char[] valueToMatchAsChars();
/**
* Path parameters associated with this path segment.
*/
MultiValueMap parameters();
}
/**
* Options to customize parsing based on the type of input path.
* @since 5.2
*/
class Options {
/**
* Options for HTTP URL paths:
* Separator '/' with URL decoding and parsing of path params.
*/
public final static Options HTTP_PATH = Options.create('/', true);
/**
* Options for a message route:
*
Separator '.' without URL decoding nor parsing of params. Escape
* sequences for the separator char in segment values are still decoded.
*/
public final static Options MESSAGE_ROUTE = Options.create('.', false);
private final char separator;
private final boolean decodeAndParseSegments;
private Options(char separator, boolean decodeAndParseSegments) {
this.separator = separator;
this.decodeAndParseSegments = decodeAndParseSegments;
}
public char separator() {
return this.separator;
}
public boolean shouldDecodeAndParseSegments() {
return this.decodeAndParseSegments;
}
/**
* Create an {@link Options} instance with the given settings.
* @param separator the separator for parsing the path into segments;
* currently this must be slash or dot.
* @param decodeAndParseSegments whether to URL decode path segment
* values and parse path parameters. If set to false, only escape
* sequences for the separator char are decoded.
*/
public static Options create(char separator, boolean decodeAndParseSegments) {
return new Options(separator, decodeAndParseSegments);
}
}
}