Initial commit: mail-server with WebFlux backend and Angular v22 Synthwave frontend

Co-authored-by: Junie <junie@jetbrains.com>

backend/src/main/java/com/mailserver/repository/AttachmentRepository.java

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+package com.mailserver.repository;
+
+import com.mailserver.domain.Attachment;
+import org.springframework.data.r2dbc.repository.R2dbcRepository;
+import reactor.core.publisher.Flux;
+
+public interface AttachmentRepository extends R2dbcRepository<Attachment, Long> {
+    Flux<Attachment> findByMessageId(Long messageId);
+}

backend/src/main/java/com/mailserver/repository/BlacklistRepository.java

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+package com.mailserver.repository;
+
+import com.mailserver.domain.BlacklistEntry;
+import org.springframework.data.r2dbc.repository.Query;
+import org.springframework.data.r2dbc.repository.R2dbcRepository;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+
+public interface BlacklistRepository extends R2dbcRepository<BlacklistEntry, Long> {
+
+    Flux<BlacklistEntry> findByUserId(Long userId);
+
+    Mono<BlacklistEntry> findByUserIdAndSenderEmail(Long userId, String senderEmail);
+
+    @Query("SELECT COUNT(*) > 0 FROM blacklist WHERE user_id = :#{#userId} AND LOWER(sender_email) = LOWER(:#{#senderEmail})")
+    Mono<Boolean> isBlacklisted(Long userId, String senderEmail);
+
+    Mono<Void> deleteByUserIdAndSenderEmail(Long userId, String senderEmail);
+}

backend/src/main/java/com/mailserver/repository/ContactRepository.java

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+package com.mailserver.repository;
+
+import com.mailserver.domain.Contact;
+import org.springframework.data.r2dbc.repository.R2dbcRepository;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+
+public interface ContactRepository extends R2dbcRepository<Contact, Long> {
+    Flux<Contact> findByUserId(Long userId);
+    Mono<Contact> findByUserIdAndEmail(Long userId, String email);
+}

backend/src/main/java/com/mailserver/repository/FolderRepository.java

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+package com.mailserver.repository;
+
+import com.mailserver.domain.Folder;
+import org.springframework.data.r2dbc.repository.Query;
+import org.springframework.data.r2dbc.repository.R2dbcRepository;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+
+public interface FolderRepository extends R2dbcRepository<Folder, Long> {
+    Flux<Folder> findByUserId(Long userId);
+    Mono<Folder> findByUserIdAndName(Long userId, String name);
+}

backend/src/main/java/com/mailserver/repository/MessageRepository.java

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+package com.mailserver.repository;
+
+import com.mailserver.domain.Message;
+import org.springframework.data.domain.Pageable;
+import org.springframework.data.r2dbc.repository.Query;
+import org.springframework.data.r2dbc.repository.R2dbcRepository;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+
+public interface MessageRepository extends R2dbcRepository<Message, Long> {
+
+    @Query("SELECT * FROM messages WHERE folder_id = :#{#folderId} ORDER BY received_at DESC")
+    Flux<Message> findByFolderId(Long folderId, Pageable pageable);
+
+    @Query("SELECT COUNT(*) FROM messages WHERE folder_id = :#{#folderId} AND is_read = false")
+    Mono<Long> countUnreadByFolderId(Long folderId);
+
+    @Query("SELECT * FROM messages WHERE folder_id = :#{#folderId} AND is_read = false ORDER BY received_at DESC")
+    Flux<Message> findUnreadByFolderId(Long folderId, Pageable pageable);
+
+    @Query("SELECT * FROM messages WHERE folder_id = :#{#folderId} AND " +
+           "(LOWER(subject) LIKE '%' || LOWER(:#{#keyword}) || '%' OR " +
+           "LOWER(sender_email) LIKE '%' || LOWER(:#{#keyword}) || '%' OR " +
+           "LOWER(sender_name) LIKE '%' || LOWER(:#{#keyword}) || '%' OR " +
+           "LOWER(body) LIKE '%' || LOWER(:#{#keyword}) || '%') " +
+           "ORDER BY received_at DESC")
+    Flux<Message> searchInFolder(Long folderId, String keyword, Pageable pageable);
+
+    @Query("SELECT * FROM messages WHERE folder_id = :#{#folderId} AND (" +
+           "(:#{#subject} IS NULL OR LOWER(subject) LIKE '%' || LOWER(:#{#subject}) || '%') AND " +
+           "(:#{#body} IS NULL OR LOWER(body) LIKE '%' || LOWER(:#{#body}) || '%') AND " +
+           "(:#{#sender} IS NULL OR LOWER(sender_email) LIKE '%' || LOWER(:#{#sender}) || '%' OR " +
+           "LOWER(sender_name) LIKE '%' || LOWER(:#{#sender}) || '%') AND " +
+           "(:#{#recipient} IS NULL OR LOWER(recipient_email) LIKE '%' || LOWER(:#{#recipient}) || '%')) " +
+           "ORDER BY received_at DESC")
+    Flux<Message> searchWithFilters(Long folderId, String subject, String body,
+                                    String sender, String recipient, Pageable pageable);
+}

backend/src/main/java/com/mailserver/repository/UserRepository.java

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+package com.mailserver.repository;
+
+import com.mailserver.domain.User;
+import org.springframework.data.r2dbc.repository.R2dbcRepository;
+import reactor.core.publisher.Mono;
+
+public interface UserRepository extends R2dbcRepository<User, Long> {
+    Mono<User> findByEmail(String email);
+    Mono<Boolean> existsByEmail(String email);
+}