feature: Initial Implementation of Email Sending Feature with dummy Data.

Author: irfan-ikhwa

server/api-service/lowcoder-domain/pom.xml

@@ -50,6 +50,10 @@
             <groupId>org.lowcoder</groupId>
             <artifactId>lowcoder-infra</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-mail</artifactId>
+        </dependency>
 
         <dependency>
             <groupId>com.github.cloudyrock.mongock</groupId>

server/api-service/lowcoder-domain/src/main/java/org/lowcoder/domain/user/model/User.java

@@ -3,6 +3,7 @@
 import static com.google.common.base.Suppliers.memoize;
 import static org.lowcoder.infra.util.AssetUtils.toAssetPath;
 
+import java.time.Instant;
 import java.util.*;
 import java.util.function.Supplier;
 
@@ -52,6 +53,10 @@ public class User extends HasIdAndAuditing implements BeforeMongodbWrite, AfterM
     @JsonProperty(access = JsonProperty.Access.WRITE_ONLY)
     private String password;
 
+    private String passwordResetToken;
+
+    private Instant passwordResetTokenExpiry;
+
     @Transient
     Boolean isAnonymous = false;
 

server/api-service/lowcoder-domain/src/main/java/org/lowcoder/domain/user/service/EmailCommunicationService.java

@@ -0,0 +1,49 @@
+package org.lowcoder.domain.user.service;
+
+import jakarta.mail.internet.MimeMessage;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.mail.javamail.JavaMailSender;
+import org.springframework.mail.javamail.MimeMessageHelper;
+import org.springframework.stereotype.Service;
+
+@Service
+@Slf4j(topic = "EmailCommunicationService")
+public class EmailCommunicationService {
+
+    @Autowired
+    private JavaMailSender javaMailSender;
+
+    @Value("${spring.mail.username}")
+    private String fromEmail;
+
+    public boolean sendMail(String to, String token, String message) {
+        try {
+            String subject = "Lost Password Email";
+            MimeMessage mimeMessage = javaMailSender.createMimeMessage();
+
+            MimeMessageHelper mimeMessageHelper = new MimeMessageHelper(mimeMessage, true);
+
+            mimeMessageHelper.setFrom(fromEmail);
+            mimeMessageHelper.setTo(to);
+            mimeMessageHelper.setSubject(subject);
+
+            // Construct the message with the token link
+            String resetLink = "http://localhost:8080/lost-password?token=" + token;
+            String messageWithLink = message + "\n\nReset your password here: " + resetLink;
+            mimeMessageHelper.setText(messageWithLink, true); // Set HTML to true to allow links
+
+            javaMailSender.send(mimeMessage);
+
+            return true;
+
+        } catch (Exception e) {
+            log.error("Failed to send mail to: {}, Exception: {}", to, e);
+            return false;
+        }
+
+
+    }
+
+}

server/api-service/lowcoder-domain/src/main/java/org/lowcoder/domain/user/service/UserService.java

@@ -50,7 +50,7 @@ public interface UserService {
 
     Mono<String> resetPassword(String userId);
 
-    Mono<String> lostPassword(String userEmail);
+    Mono<Void> lostPassword(String userEmail);
 
     Mono<Boolean> setPassword(String userId, String password);
 

server/api-service/lowcoder-domain/src/main/java/org/lowcoder/domain/user/service/UserServiceImpl.java

@@ -29,6 +29,7 @@
 import org.lowcoder.sdk.constants.WorkspaceMode;
 import org.lowcoder.sdk.exception.BizError;
 import org.lowcoder.sdk.exception.BizException;
+import org.lowcoder.sdk.util.HashUtils;
 import org.lowcoder.sdk.util.LocaleUtils;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.dao.DuplicateKeyException;
@@ -41,7 +42,9 @@
 import javax.annotation.Nonnull;
 import java.security.SecureRandom;
 import java.time.Duration;
+import java.time.Instant;
 import java.time.LocalDate;
+import java.time.temporal.ChronoUnit;
 import java.util.*;
 import java.util.function.Function;
 import java.util.stream.Collectors;
@@ -76,7 +79,8 @@ public class UserServiceImpl implements UserService {
     private CommonConfig commonConfig;
     @Autowired
     private AuthenticationService authenticationService;
-
+    @Autowired
+    private EmailCommunicationService emailCommunicationService;
     private Conf<Integer> avatarMaxSizeInKb;
 
     @PostConstruct
@@ -265,10 +269,18 @@ public Mono<String> resetPassword(String userId) {
     }
 
     @Override
-    public Mono<String> lostPassword(String userEmail) {
+    public Mono<Void> lostPassword(String userEmail) {
         return findByName(userEmail)
                 .flatMap(user -> {
-                    return Mono.justOrEmpty(user.getName());
+                    String token = generateNewRandomPwd();
+                    Instant tokenExpiry = Instant.now().plus(12, ChronoUnit.HOURS);
+                    // TODO - IRFAN this is just a dummy email.
+                    if (!emailCommunicationService.sendMail("notify@lowcoder.org", token, "Click Here")) {
+                        return ofError(BizError.USER_NOT_EXIST, "SENDING_EMAIL_FAILED");
+                    }
+                    user.setPasswordResetToken(HashUtils.hash(token.getBytes()));
+                    user.setPasswordResetTokenExpiry(tokenExpiry);
+                    return Mono.empty();
                 });
     }
 

server/api-service/lowcoder-sdk/src/main/java/org/lowcoder/sdk/config/CommonConfig.java

@@ -44,6 +44,7 @@ public class CommonConfig {
     private Cookie cookie = new Cookie();
     private JsExecutor jsExecutor = new JsExecutor();
     private Set<String> disallowedHosts = new HashSet<>();
+    private SMTP smtp = new SMTP();
 
     public boolean isSelfHost() {
         return !isCloud();
@@ -145,6 +146,13 @@ public static class JsExecutor {
         private String host;
     }
 
+    @Data
+    public static class SMTP {
+        private String email;
+        private String host;
+        private String port;
+    }
+
 
     @Getter
     @Setter

server/api-service/lowcoder-server/src/main/java/org/lowcoder/api/usermanagement/UserApiService.java

@@ -65,7 +65,7 @@ public Mono<String> resetPassword(String userId) {
                 .then(userService.resetPassword(userId));
     }
 
-    public Mono<String> lostPassword(String userEmail) {
+    public Mono<Void> lostPassword(String userEmail) {
         return userService.lostPassword(userEmail);
     }
 

server/api-service/lowcoder-server/src/main/java/org/lowcoder/api/usermanagement/UserController.java

@@ -147,7 +147,7 @@ public Mono<ResponseView<String>> resetPassword(@RequestBody ResetPasswordReques
     }
 
     @Override
-    public Mono<ResponseView<String>> lostPassword(@RequestBody LostPasswordRequest request) {
+    public Mono<ResponseView<Void>> lostPassword(@RequestBody LostPasswordRequest request) {
         if (StringUtils.isBlank(request.userEmail())) {
             return ofError(BizError.INVALID_PARAMETER, "INVALID_USER_EMAIL");
         }

server/api-service/lowcoder-server/src/main/java/org/lowcoder/api/usermanagement/UserEndpoints.java

@@ -122,7 +122,7 @@ public interface UserEndpoints
     public Mono<ResponseView<String>> resetPassword(@RequestBody ResetPasswordRequest request);
 
 	@PostMapping("/lost-password")
-	public Mono<ResponseView<String>> lostPassword(@RequestBody LostPasswordRequest userEmail);
+	public Mono<ResponseView<Void>> lostPassword(@RequestBody LostPasswordRequest userEmail);
 
 	@Operation(
 			tags = TAG_USER_PASSWORD_MANAGEMENT,

server/api-service/lowcoder-server/src/main/resources/application-lowcoder.yml

@@ -9,6 +9,18 @@ spring:
   main:
     allow-bean-definition-overriding: true
     allow-circular-references: true
+  mail:
+#    TODO - IRFAN this is just  a test email to check the email sending.
+    username: "irfan.ayub@ikhwatech.com"
+    password: "abcd"
+    host: "smtp.freesmtpservers.com"
+    port: 25
+#    properties:
+#      mail:
+#        smtp:
+#          starttls:
+#            enable: true
+#          auth: true
 
 server:
   compression:
@@ -62,4 +74,4 @@ auth:
   email:
     enable: true
     enable-register: true
-  workspace-creation: true
+  workspace-creation: true