Handle exception while sending test email (#1860)

* 添加邮件发送失败时的报错信息

* 按照修改建议进行修改

* 按照修改建议进行修改

* 将exception的异常处理修改为instanceof

* 在ControllerWxceptionHandler中添加对应异常处理

* 删除调试输出，优化报错信息

src/main/java/run/halo/app/controller/admin/api/MailController.java

@@ -31,6 +31,7 @@ public class MailController {
     @ApiOperation("Tests the SMTP service")
     @DisableOnCondition
     public BaseResponse<String> testMail(@Valid @RequestBody MailParam mailParam) {
+        mailService.testConnection();
         mailService.sendTextMail(mailParam.getTo(), mailParam.getSubject(), mailParam.getContent());
         return BaseResponse.ok("已发送，请查收。若确认没有收到邮件，请检查服务器日志");
     }

src/main/java/run/halo/app/core/ControllerExceptionHandler.java

@@ -1,6 +1,7 @@
 package run.halo.app.core;
 
 import java.util.Map;
+import javax.mail.MessagingException;
 import javax.validation.ConstraintViolationException;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.dao.DataIntegrityViolationException;
@@ -18,6 +19,7 @@ import org.springframework.web.bind.annotation.RestControllerAdvice;
 import org.springframework.web.multipart.MaxUploadSizeExceededException;
 import org.springframework.web.servlet.NoHandlerFoundException;
 import run.halo.app.exception.AbstractHaloException;
+import run.halo.app.exception.EmailException;
 import run.halo.app.model.support.BaseResponse;
 import run.halo.app.utils.ExceptionUtils;
 import run.halo.app.utils.ValidationUtils;
@@ -142,6 +144,32 @@ public class ControllerExceptionHandler {
         return baseResponse;
     }
 
+    @ExceptionHandler(EmailException.class)
+    @ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
+    public BaseResponse<?> handleMessagingException(MessagingException e) {
+        BaseResponse<?> baseResponse = handleBaseException(e);
+        String message;
+        if (e instanceof com.sun.mail.util.MailConnectException) {
+            if (e.getCause() instanceof java.net.UnknownHostException) {
+                message = "SMTP 服务器解析错误，请检查 SMTP 服务器地址";
+            } else if (e.getCause() instanceof java.net.ConnectException) {
+                message = "无法连接至邮件服务器，请检查地址和端口号";
+            } else if (e.getCause() instanceof java.net.SocketException) {
+                message = "网络连接超时，请检查网络连通性";
+            } else {
+                message = "无法连接至邮件服务器，请检查地址和端口号";
+            }
+        } else if (e instanceof javax.mail.NoSuchProviderException) {
+            message = "发送协议配置错误，请检查发送协议";
+        } else if (e instanceof javax.mail.AuthenticationFailedException) {
+            message = "邮箱账号密码验证失败，请检查密码是否应为授权码";
+        } else {
+            message = "出现未知错误，请检查系统日志";
+        }
+        baseResponse.setMessage(message);
+        return baseResponse;
+    }
+
     private <T> BaseResponse<T> handleBaseException(Throwable t) {
         Assert.notNull(t, "Throwable must not be null");
 

src/main/java/run/halo/app/mail/AbstractMailService.java

@@ -67,8 +67,8 @@ public abstract class AbstractMailService implements MailService {
             JavaMailSenderImpl mailSender = (JavaMailSenderImpl) javaMailSender;
             try {
                 mailSender.testConnection();
-            } catch (MessagingException e) {
-                throw new EmailException("无法连接到邮箱服务器，请检查邮箱配置.[" + e.getMessage() + "]", e);
+            } catch (Throwable e) {
+                throw new EmailException(e.getMessage(), e);
             }
         }
     }
@@ -239,5 +239,4 @@ public abstract class AbstractMailService implements MailService {
         this.cachedMailProperties = null;
         log.debug("Cleared all mail caches");
     }
-
 }