| /**************************************************************** |
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| * or more contributor license agreements. See the NOTICE file * |
| * distributed with this work for additional information * |
| * regarding copyright ownership. The ASF 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 * |
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| * specific language governing permissions and limitations * |
| * under the License. * |
| ****************************************************************/ |
| |
| package org.apache.james.jmap.mailet.filter; |
| |
| import static org.apache.mailet.base.RFC2822Headers.FROM; |
| |
| import java.util.Map; |
| import java.util.Optional; |
| import java.util.stream.Stream; |
| |
| import jakarta.mail.Message; |
| import jakarta.mail.internet.InternetAddress; |
| |
| import org.apache.james.javax.AddressHelper; |
| import org.apache.james.jmap.api.filtering.Rule; |
| import org.apache.james.mime4j.util.MimeUtil; |
| import org.apache.james.util.StreamUtils; |
| import org.apache.mailet.Mail; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import com.github.fge.lambdas.Throwing; |
| import com.github.fge.lambdas.functions.ThrowingFunction; |
| import com.google.common.collect.ImmutableMap; |
| |
| public interface HeaderExtractor extends ThrowingFunction<Mail, Stream<String>> { |
| Logger LOGGER = LoggerFactory.getLogger(HeaderExtractor.class); |
| |
| HeaderExtractor SUBJECT_EXTRACTOR = mail -> |
| StreamUtils.ofNullables(mail.getMessage().getSubject()); |
| HeaderExtractor CC_EXTRACTOR = recipientExtractor(Message.RecipientType.CC); |
| HeaderExtractor TO_EXTRACTOR = recipientExtractor(Message.RecipientType.TO); |
| HeaderExtractor RECIPIENT_EXTRACTOR = and(TO_EXTRACTOR, CC_EXTRACTOR); |
| HeaderExtractor FROM_EXTRACTOR = addressExtractor(mail -> mail.getMessage().getHeader(FROM), FROM); |
| |
| Map<Rule.Condition.Field, HeaderExtractor> HEADER_EXTRACTOR_REGISTRY = ImmutableMap.<Rule.Condition.Field, HeaderExtractor>builder() |
| .put(Rule.Condition.Field.SUBJECT, SUBJECT_EXTRACTOR) |
| .put(Rule.Condition.Field.RECIPIENT, RECIPIENT_EXTRACTOR) |
| .put(Rule.Condition.Field.FROM, FROM_EXTRACTOR) |
| .put(Rule.Condition.Field.CC, CC_EXTRACTOR) |
| .put(Rule.Condition.Field.TO, TO_EXTRACTOR) |
| .build(); |
| |
| boolean STRICT_PARSING = true; |
| |
| static HeaderExtractor and(HeaderExtractor headerExtractor1, HeaderExtractor headerExtractor2) { |
| return (Mail mail) -> StreamUtils.flatten(headerExtractor1.apply(mail), headerExtractor2.apply(mail)); |
| } |
| |
| static HeaderExtractor recipientExtractor(Message.RecipientType type) { |
| String headerName = type.toString(); |
| ThrowingFunction<Mail, String[]> addressGetter = mail -> mail.getMessage().getHeader(headerName); |
| |
| return addressExtractor(addressGetter, headerName); |
| } |
| |
| static HeaderExtractor addressExtractor(ThrowingFunction<Mail, String[]> addressGetter, String fallbackHeaderName) { |
| return mail -> { |
| try { |
| return toAddressContents(addressGetter.apply(mail)); |
| } catch (Exception e) { |
| LOGGER.info("Failed parsing header. Falling back to unparsed header value matching", e); |
| return Stream.of(mail.getMessage().getHeader(fallbackHeaderName)) |
| .map(MimeUtil::unscrambleHeaderValue); |
| } |
| }; |
| } |
| |
| static Stream<String> toAddressContents(String[] headers) { |
| return StreamUtils.ofNullable(headers) |
| .map(Throwing.function(string -> InternetAddress.parseHeader(string, !STRICT_PARSING))) |
| .flatMap(AddressHelper::asStringStream); |
| } |
| |
| static Optional<HeaderExtractor> asHeaderExtractor(Rule.Condition.Field field) { |
| return Optional.ofNullable( |
| HeaderExtractor.HEADER_EXTRACTOR_REGISTRY.get(field)); |
| } |
| } |