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package org.apache.james.mailetcontainer.impl.matchers;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.util.Arrays;
import java.util.Base64;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.CompletableFuture;
import java.util.stream.Collectors;
import javax.mail.BodyPart;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import org.apache.commons.lang3.StringUtils;
import org.apache.mailet.Mail;
import org.apache.mailet.base.GenericMailet;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.fasterxml.jackson.databind.ObjectMapper;
public class ReceiveEmailMailet extends GenericMailet {
public static final Logger LOGGER = LoggerFactory.getLogger(ReceiveEmailMailet.class);
@Override
public void service(Mail mail) throws MessagingException {
LOGGER.info("收件钩子：Subject: {}", mail.getMessage().getSubject());
LOGGER.info("收件钩子：MessageID: {}", mail.getMessage().getMessageID());
try {
sendAsyncHttpRequest(mail);
} catch (IOException e) {
LOGGER.error(e.toString());
}
}
private void sendAsyncHttpRequest(Mail mail) throws MessagingException, IOException {
HttpClient httpClient = HttpClient.newHttpClient();
Map<String, Object> stringObjectMap = buildRequestBody(mail);
ObjectMapper objectMapper = new ObjectMapper();
String requestBody = objectMapper.writeValueAsString(stringObjectMap);
HttpRequest request = HttpRequest.newBuilder()
.uri(URI.create("http://127.0.0.1:6001/api/mail/hook/receive"))
.header("Content-Type", "application/json")
.POST(HttpRequest.BodyPublishers.ofString(requestBody))
.build();
CompletableFuture<HttpResponse<String>> futureResponse = httpClient.sendAsync(request, HttpResponse.BodyHandlers.ofString());
futureResponse.thenAccept(response -> {
int statusCode = response.statusCode();
String responseBody = response.body();
if (statusCode == 200) {
LOGGER.info("收件钩子：推送成功");
} else {
LOGGER.error("收件钩子：邮件推送失败，状态码: {} ,响应内容: {} ", statusCode, responseBody);
}
}).exceptionally(ex -> {
LOGGER.error("收件钩子：邮件推送时发生异常: {}", ex.toString());
return null;
});
}
private Map<String, Object> buildRequestBody(Mail mail) throws MessagingException, IOException {
Map<String, Object> emailData = new HashMap<>();
MimeMessage message = mail.getMessage();
CompletableFuture<Object> futureResult = handleRelatedContentAsync(message);
List<String> to = Arrays.stream(message.getRecipients(Message.RecipientType.TO)).map(m -> ((InternetAddress) m).getAddress()).collect(Collectors.toList());
List<String> from = Arrays.stream(message.getFrom()).map(m -> ((InternetAddress) m).getAddress()).collect(Collectors.toList());
emailData.put("subject", message.getSubject());
emailData.put("from", from);
emailData.put("to", to);
emailData.put("messageID", mail.getMessage().getMessageID());
emailData.put("date", message.getReceivedDate());
emailData.put("content", futureResult.join());
return emailData;
}
private CompletableFuture<Object> handleRelatedContentAsync(Message message) {
return CompletableFuture.supplyAsync(() -> {
try {
if (message.isMimeType("text/plain") || message.isMimeType("text/html")) {
return message.getContent().toString();
} else if (message.isMimeType("multipart/*")) {
Multipart multipart = (Multipart) message.getContent();
StringBuilder htmlContent = new StringBuilder();
Map<String, String> imageMap = new HashMap<>();
buildMultipartResout(multipart, htmlContent, imageMap);
return htmlContent.toString();
}
return "unknown content format";
} catch (Exception e) {
LOGGER.error("Error processing related content", e);
return "error";
}
});
}
private void buildMultipartResout(Multipart multipart, StringBuilder htmlContent, Map<String, String> imageMap) throws Exception {
for (int i = 0; i < multipart.getCount(); i++) {
BodyPart part = multipart.getBodyPart(i);
if (part.getContentType().contains("multipart/related") || part.getContentType().contains("multipart/RELATED")) {
buildMultipartResout((Multipart) part.getContent(), htmlContent, imageMap);
} else if (part.isMimeType("multipart/alternative") || part.getContentType().contains("multipart/ALTERNATIVE")) {
processMultipartAlternative(part, htmlContent, imageMap);
} else if (part.isMimeType("image/*")) {
processImg(part, imageMap);
} else if (part.getContent() instanceof Multipart) {
processMultipartAlternative(part, htmlContent, imageMap);
} else if (part.isMimeType("text/html")) {
htmlContent.append(part.getContent().toString());
} else {
LOGGER.warn("其他部分 ContentType: " + part.getContentType());
}
}
String content = getContent(htmlContent, imageMap);
htmlContent.setLength(0);
htmlContent.append(StringUtils.isEmpty(content) ? "unknown content format" : content);
}
private void processMultipartAlternative(BodyPart part, StringBuilder htmlContent, Map<String, String> imageMap) throws Exception {
if (part.getContent() instanceof Multipart) {
Multipart alternative = (Multipart) part.getContent();
for (int i = 0; i < alternative.getCount(); i++) {
BodyPart subPart = alternative.getBodyPart(i);
if (subPart.isMimeType("text/html")) {
htmlContent.append(subPart.getContent()).append("<br/>");
} else if (subPart.isMimeType("image/*")) {
processImg(subPart, imageMap);
} else if (subPart.isMimeType("multipart/alternative") || subPart.getContentType().contains("multipart/ALTERNATIVE")) {
processMultipartAlternative(subPart, htmlContent, imageMap);
} else if (subPart.getContentType().contains("multipart/related") || subPart.getContentType().contains("multipart/RELATED")) {
processMultipartAlternative(subPart, htmlContent, imageMap);
} else {
LOGGER.warn("[processMultipartAlternative]其他部分 ContentType: " + subPart.getContentType());
}
}
} else {
LOGGER.warn("multipart/ALTERNATIVE 的内容不是 Multipart 类型");
}
}
private static String getContent(StringBuilder htmlContent, Map<String, String> imageMap) {
String content = htmlContent.toString();
if (!imageMap.isEmpty()) {
for (Map.Entry<String, String> entry : imageMap.entrySet()) {
String contentId = entry.getKey();
String base64Image = entry.getValue();
String imgPattern = "cid:" + contentId;
String base64Pattern = "data:image/jpeg;base64," + base64Image;
content = content.replace(imgPattern, base64Pattern);
}
}
return content;
}
private void processImg(BodyPart part, Map<String, String> imageMap) throws MessagingException, IOException {
String[] contentIds = part.getHeader("Content-ID");
if (contentIds != null && contentIds.length > 0) {
String contentId = contentIds[0].replaceAll("[<>]", "");
String base64Image = convertImageToBase64(part);
imageMap.put(contentId, base64Image);
}
}
private String convertImageToBase64(BodyPart part) throws MessagingException, IOException {
try (InputStream is = part.getInputStream()) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buffer = new byte[4096];
int bytesRead;
while ((bytesRead = is.read(buffer)) != -1) {
baos.write(buffer, 0, bytesRead);
}
return Base64.getEncoder().encodeToString(baos.toByteArray());
}
}
}
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