PostgresSearchService: make it readable

1 files changed, 125 insertions, 0 deletions

diff --git a/src/main/java/com/juick/service/PostgresSearchService.java b/src/main/java/com/juick/service/PostgresSearchService.java
new file mode 100644
index 00000000..500f3d20
--- /dev/null
+++ b/src/main/java/com/juick/service/PostgresSearchService.java
@@ -0,0 +1,125 @@
+/*
+ * Copyright (C) 2008-2022, Juick
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.juick.service;
+
+import com.juick.model.User;
+import org.apache.commons.lang3.StringUtils;
+import org.postgresql.PGConnection;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.jdbc.core.namedparam.MapSqlParameterSource;
+import org.springframework.stereotype.Repository;
+import org.springframework.transaction.annotation.Transactional;
+
+import javax.inject.Inject;
+import javax.sql.DataSource;
+import java.sql.SQLException;
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * Created by aalexeev on 11/18/16.
+ */
+
+@Repository
+@ConditionalOnProperty(name = "spring.sql.init.platform", havingValue = "postgresql")
+@Transactional(readOnly = true)
+public class PostgresSearchService extends BaseJdbcService implements SearchService {
+    private static final int DEFAULT_MAX_RESULT = 20;
+
+    private int maxResult = DEFAULT_MAX_RESULT;
+
+    @Inject
+    UserService userService;
+    @Inject
+    DataSource dataSource;
+
+    private String escapeQuery(String searchString) {
+        try (var connection = dataSource.getConnection()) {
+            var pg = connection.unwrap(PGConnection.class);
+            return pg.escapeLiteral(searchString);
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+        return searchString;
+    }
+
+
+    public List<Integer> search(final int visitorId, final int userId, final String searchString, final int page) {
+        var usersFilter = userService.getUserBLUsers(visitorId).stream().map(User::getUid).toList();
+        var offset = page * maxResult;
+        var query = escapeQuery(searchString);
+        var isOneWord = query.split("[^\\S\\+]+").length == 1;
+        var sql = """
+                SELECT
+                                    message_id
+                                  FROM
+                                    (
+                                      select
+                                        messages.message_id message_id,
+                                        messages.user_id user_id,
+                                        txt,
+                                        to_tsvector('russian', txt) v,
+                                        websearch_to_tsquery('russian', :query) q
+                                      from
+                                        messages_txt
+                                        inner join messages on messages.message_id = messages_txt.message_id
+                                    ) t
+                                  WHERE
+                                    v @@ q
+                """
+                + ( userId > 0 ? "AND user_id = :user_id" : "" ) +
+                """
+                """
+                + (usersFilter.isEmpty() ? "" : " AND user_id NOT IN (:filter)") +
+                """
+                                  ORDER BY
+                """
+                + (isOneWord ? "message_id DESC" : "ts_rank_cd(v, q) DESC, message_id DESC") +
+                """
+                                  LIMIT :limit OFFSET :offset
+                """;
+        return getNamedParameterJdbcTemplate().queryForList(sql,
+                new MapSqlParameterSource()
+                        .addValue("query", escapeQuery(searchString))
+                        .addValue("user_id", userId)
+                        .addValue("filter", usersFilter)
+                        .addValue("limit", maxResult)
+                        .addValue("offset", offset), Integer.class);
+    }
+
+    @Override
+    public List<Integer> searchInAllMessages(User visitor, final String searchString, final int page) {
+        if (StringUtils.isBlank(searchString))
+            return Collections.emptyList();
+        return search(visitor.getUid(), -1, searchString, page);
+    }
+
+    @Override
+    public List<Integer> searchByStringAndUser(User visitor, final String searchString, final int userId, int page) {
+        if (StringUtils.isBlank(searchString))
+            return Collections.emptyList();
+        return search(visitor.getUid(), userId, searchString, page);
+    }
+
+    @Override
+    public void setMaxResult(int maxResult) {
+        if (maxResult <= 0)
+            throw new IllegalArgumentException("maxResult value (" + maxResult + ") must be greater then 0");
+        this.maxResult = maxResult;
+    }
+}
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