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// Copyright (C) 2016 The Android Open Source Project
//
// 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
//
// 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 com.google.gerrit.mail;
import com.google.common.base.Splitter;
import com.google.common.base.Strings;
import com.google.common.flogger.FluentLogger;
import com.google.common.primitives.Ints;
import java.sql.Timestamp;
import java.time.Instant;
import java.time.format.DateTimeParseException;
/** Parse metadata from inbound email */
public class MailHeaderParser {
private static final FluentLogger logger = FluentLogger.forEnclosingClass();
public static MailMetadata parse(MailMessage m) {
MailMetadata metadata = new MailMetadata();
// Find author
metadata.author = m.from().email();
// Check email headers for X-Gerrit-<Name>
for (String header : m.additionalHeaders()) {
if (header.startsWith(MailHeader.CHANGE_NUMBER.fieldWithDelimiter())) {
String num = header.substring(MailHeader.CHANGE_NUMBER.fieldWithDelimiter().length());
metadata.changeNumber = Ints.tryParse(num);
} else if (header.startsWith(MailHeader.PATCH_SET.fieldWithDelimiter())) {
String ps = header.substring(MailHeader.PATCH_SET.fieldWithDelimiter().length());
metadata.patchSet = Ints.tryParse(ps);
} else if (header.startsWith(MailHeader.COMMENT_DATE.fieldWithDelimiter())) {
String ts = header.substring(MailHeader.COMMENT_DATE.fieldWithDelimiter().length()).trim();
try {
metadata.timestamp =
Timestamp.from(MailProcessingUtil.rfcDateformatter.parse(ts, Instant::from));
} catch (DateTimeParseException e) {
logger.atSevere().withCause(e).log(
"Mail: Error while parsing timestamp from header of message %s", m.id());
}
} else if (header.startsWith(MailHeader.MESSAGE_TYPE.fieldWithDelimiter())) {
metadata.messageType =
header.substring(MailHeader.MESSAGE_TYPE.fieldWithDelimiter().length());
}
}
if (metadata.hasRequiredFields()) {
return metadata;
}
// If the required fields were not yet found, continue to parse the text
if (!Strings.isNullOrEmpty(m.textContent())) {
Iterable<String> lines = Splitter.on('\n').split(m.textContent().replace("\r\n", "\n"));
extractFooters(lines, metadata, m);
if (metadata.hasRequiredFields()) {
return metadata;
}
}
// If the required fields were not yet found, continue to parse the HTML
// HTML footer are contained inside a <div> tag
if (!Strings.isNullOrEmpty(m.htmlContent())) {
Iterable<String> lines = Splitter.on("</div>").split(m.htmlContent().replace("\r\n", "\n"));
extractFooters(lines, metadata, m);
if (metadata.hasRequiredFields()) {
return metadata;
}
}
return metadata;
}
private static void extractFooters(Iterable<String> lines, MailMetadata metadata, MailMessage m) {
for (String line : lines) {
if (metadata.changeNumber == null && line.contains(MailHeader.CHANGE_NUMBER.getName())) {
metadata.changeNumber =
Ints.tryParse(extractFooter(MailHeader.CHANGE_NUMBER.withDelimiter(), line));
} else if (metadata.patchSet == null && line.contains(MailHeader.PATCH_SET.getName())) {
metadata.patchSet =
Ints.tryParse(extractFooter(MailHeader.PATCH_SET.withDelimiter(), line));
} else if (metadata.timestamp == null && line.contains(MailHeader.COMMENT_DATE.getName())) {
String ts = extractFooter(MailHeader.COMMENT_DATE.withDelimiter(), line);
try {
metadata.timestamp =
Timestamp.from(MailProcessingUtil.rfcDateformatter.parse(ts, Instant::from));
} catch (DateTimeParseException e) {
logger.atSevere().withCause(e).log(
"Mail: Error while parsing timestamp from footer of message %s", m.id());
}
} else if (metadata.messageType == null && line.contains(MailHeader.MESSAGE_TYPE.getName())) {
metadata.messageType = extractFooter(MailHeader.MESSAGE_TYPE.withDelimiter(), line);
}
}
}
private static String extractFooter(String key, String line) {
return line.substring(line.indexOf(key) + key.length()).trim();
}
}