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spring-web/src/main/java/org/springframework/http/ETag.java
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| /* | ||
| * Copyright 2002-2024 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. | ||
| */ | ||
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| package org.springframework.http; | ||
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| import java.util.ArrayList; | ||
| import java.util.List; | ||
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| import org.apache.commons.logging.Log; | ||
| import org.apache.commons.logging.LogFactory; | ||
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| import org.springframework.util.StringUtils; | ||
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| /** | ||
| * Represents an ETag for HTTP conditional requests. | ||
| * | ||
| * @author Rossen Stoyanchev | ||
| * @since 5.3.38 | ||
| * @see <a href="https://datatracker.ietf.org/doc/html/rfc7232">RFC 7232</a> | ||
| */ | ||
| public class ETag { | ||
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| private static final Log logger = LogFactory.getLog(ETag.class); | ||
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| private static final ETag WILDCARD = new ETag("*", false); | ||
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| private final String tag; | ||
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| private final boolean weak; | ||
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| public ETag(String tag, boolean weak) { | ||
| this.tag = tag; | ||
| this.weak = weak; | ||
| } | ||
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| public String tag() { | ||
| return this.tag; | ||
| } | ||
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| public boolean weak() { | ||
| return this.weak; | ||
| } | ||
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| /** | ||
| * Whether this a wildcard tag matching to any entity tag value. | ||
| */ | ||
| public boolean isWildcard() { | ||
| return (this == WILDCARD); | ||
| } | ||
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| /** | ||
| * Return the fully formatted tag including "W/" prefix and quotes. | ||
| */ | ||
| public String formattedTag() { | ||
| if (this == WILDCARD) { | ||
| return "*"; | ||
| } | ||
| return (this.weak ? "W/" : "") + "\"" + this.tag + "\""; | ||
| } | ||
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| @Override | ||
| public String toString() { | ||
| return formattedTag(); | ||
| } | ||
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| /** | ||
| * Parse entity tags from an "If-Match" or "If-None-Match" header. | ||
| * @param source the source string to parse | ||
| * @return the parsed ETags | ||
| */ | ||
| public static List<ETag> parse(String source) { | ||
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| List<ETag> result = new ArrayList<>(); | ||
| State state = State.BEFORE_QUOTES; | ||
| int startIndex = -1; | ||
| boolean weak = false; | ||
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| for (int i = 0; i < source.length(); i++) { | ||
| char c = source.charAt(i); | ||
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| if (state == State.IN_QUOTES) { | ||
| if (c == '"') { | ||
| String tag = source.substring(startIndex, i); | ||
| if (StringUtils.hasText(tag)) { | ||
| result.add(new ETag(tag, weak)); | ||
| } | ||
| state = State.AFTER_QUOTES; | ||
| startIndex = -1; | ||
| weak = false; | ||
| } | ||
| continue; | ||
| } | ||
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| if (Character.isWhitespace(c)) { | ||
| continue; | ||
| } | ||
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| if (c == ',') { | ||
| state = State.BEFORE_QUOTES; | ||
| continue; | ||
| } | ||
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| if (state == State.BEFORE_QUOTES) { | ||
| if (c == '*') { | ||
| result.add(WILDCARD); | ||
| state = State.AFTER_QUOTES; | ||
| continue; | ||
| } | ||
| if (c == '"') { | ||
| state = State.IN_QUOTES; | ||
| startIndex = i + 1; | ||
| continue; | ||
| } | ||
| if (c == 'W' && source.length() > i + 2) { | ||
| if (source.charAt(i + 1) == '/' && source.charAt(i + 2) == '"') { | ||
| state = State.IN_QUOTES; | ||
| i = i + 2; | ||
| startIndex = i + 1; | ||
| weak = true; | ||
| continue; | ||
| } | ||
| } | ||
| } | ||
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| if (logger.isDebugEnabled()) { | ||
| logger.debug("Unexpected char at index " + i); | ||
| } | ||
| } | ||
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| if (state != State.IN_QUOTES && logger.isDebugEnabled()) { | ||
| logger.debug("Expected closing '\"'"); | ||
| } | ||
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| return result; | ||
| } | ||
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| private enum State { | ||
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| BEFORE_QUOTES, IN_QUOTES, AFTER_QUOTES | ||
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| } | ||
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| } |
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