Add email verification functionality, including backend support, email handling, and user interface integration.

backend/src/main/java/com/alttd/altitudeweb/services/mail/MailVerificationService.java

@@ -0,0 +1,140 @@
+package com.alttd.altitudeweb.services.mail;
+
+import com.alttd.altitudeweb.database.Databases;
+import com.alttd.altitudeweb.database.web_db.mail.EmailVerification;
+import com.alttd.altitudeweb.database.web_db.mail.EmailVerificationMapper;
+import com.alttd.altitudeweb.setup.Connection;
+import jakarta.mail.MessagingException;
+import jakarta.mail.internet.MimeMessage;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.mail.javamail.JavaMailSender;
+import org.springframework.mail.javamail.MimeMessageHelper;
+import org.springframework.stereotype.Service;
+
+import java.time.Instant;
+import java.util.Optional;
+import java.util.Random;
+import java.util.UUID;
+import java.util.concurrent.CompletableFuture;
+
+@Slf4j
+@Service
+@RequiredArgsConstructor
+public class MailVerificationService {
+
+    private final JavaMailSender mailSender;
+
+    @Value("${spring.mail.username}")
+    private String fromEmail;
+
+    public java.util.List<EmailVerification> listAll(UUID userUuid) {
+        java.util.concurrent.CompletableFuture<java.util.List<EmailVerification>> future = new java.util.concurrent.CompletableFuture<>();
+        Connection.getConnection(Databases.DEFAULT)
+                .runQuery(sql -> {
+                    EmailVerificationMapper mapper = sql.getMapper(EmailVerificationMapper.class);
+                    future.complete(mapper.findAllByUser(userUuid));
+                });
+        return future.join();
+    }
+
+    public EmailVerification submitEmail(UUID userUuid, String email) {
+        String code = generateCode();
+        Instant now = Instant.now();
+
+        CompletableFuture<EmailVerification> future = new CompletableFuture<>();
+        Connection.getConnection(Databases.DEFAULT)
+                .runQuery(sql -> {
+                    EmailVerificationMapper mapper = sql.getMapper(EmailVerificationMapper.class);
+                    EmailVerification existing = mapper.findByUserAndEmail(userUuid, email);
+                    EmailVerification toPersist;
+                    if (existing == null) {
+                        toPersist = new EmailVerification(UUID.randomUUID(), userUuid, email, code, false, now, null, now);
+                        mapper.insert(toPersist);
+                    } else {
+                        mapper.updateCodeAndLastSent(existing.id(), code, now);
+                        toPersist = new EmailVerification(existing.id(), userUuid, email, code, false, existing.createdAt(), null, now);
+                    }
+                    future.complete(toPersist);
+                });
+        EmailVerification saved = future.join();
+        sendVerificationEmail(saved);
+        return saved;
+    }
+
+    public Optional<EmailVerification> verifyCode(UUID userUuid, String code) {
+        CompletableFuture<Optional<EmailVerification>> future = new CompletableFuture<>();
+        Connection.getConnection(Databases.DEFAULT)
+                .runQuery(sql -> {
+                    EmailVerificationMapper mapper = sql.getMapper(EmailVerificationMapper.class);
+                    EmailVerification found = mapper.findByUserAndCode(userUuid, code);
+                    if (found == null) {
+                        future.complete(Optional.empty());
+                        return;
+                    }
+                    mapper.markVerified(found.id(), Instant.now());
+                    future.complete(Optional.of(found));
+                });
+        return future.join();
+    }
+
+    public EmailVerification resend(UUID userUuid, String email) {
+        String code = generateCode();
+        Instant now = Instant.now();
+        CompletableFuture<EmailVerification> future = new CompletableFuture<>();
+        Connection.getConnection(Databases.DEFAULT)
+                .runQuery(sql -> {
+                    EmailVerificationMapper mapper = sql.getMapper(EmailVerificationMapper.class);
+                    EmailVerification existing = mapper.findByUserAndEmail(userUuid, email);
+                    if (existing != null) {
+                        mapper.updateCodeAndLastSent(existing.id(), code, now);
+                        future.complete(new EmailVerification(existing.id(), userUuid, email, code, false, existing.createdAt(), null, now));
+                    } else {
+                        future.complete(null);
+                    }
+                });
+        EmailVerification updated = future.join();
+        if (updated != null) {
+            sendVerificationEmail(updated);
+        }
+        return updated;
+    }
+
+    public boolean delete(UUID userUuid, String email) {
+        CompletableFuture<Boolean> future = new CompletableFuture<>();
+        Connection.getConnection(Databases.DEFAULT)
+                .runQuery(sql -> {
+                    EmailVerificationMapper mapper = sql.getMapper(EmailVerificationMapper.class);
+                    EmailVerification existing = mapper.findByUserAndEmail(userUuid, email);
+                    if (existing != null) {
+                        mapper.deleteByUserAndEmail(userUuid, email);
+                        future.complete(true);
+                    } else {
+                        future.complete(false);
+                    }
+                });
+        return future.join();
+    }
+
+    private void sendVerificationEmail(EmailVerification emailVerification) {
+        try {
+            MimeMessage message = mailSender.createMimeMessage();
+            MimeMessageHelper helper = new MimeMessageHelper(message, true);
+            helper.setFrom(fromEmail);
+            helper.setTo(emailVerification.email());
+            helper.setSubject("Your verification code");
+            helper.setText("Your verification code is: " + emailVerification.verificationCode(), false);
+            mailSender.send(message);
+        } catch (MessagingException e) {
+            log.error("Failed to send verification email to {}", emailVerification.email(), e);
+        }
+    }
+
+    private String generateCode() {
+        // 6-digit numeric code
+        Random random = new Random();
+        int num = 100000 + random.nextInt(899999);
+        return String.valueOf(num);
+    }
+}