db: add search querying function, fix permissions

fetch_catalog_pgrest_test.sh

@@ -2,5 +2,5 @@
 time curl \
     -v \
     -H "Content-Type: application/json" \
-    -d '{ "max_time": "2023-10-26", "max_row_read": 1001 }' \
+    -d '{ "max_time": "2023-11-02", "max_row_read": 1001 }' \
     -X POST http://localhost:3000/rpc/fetch_catalog

search_test.sh

@@ -0,0 +1,6 @@
+#--header "Authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJyb2xlIjoiY2hhbl9hcmNoaXZlciJ9.rGIKZokTDKTuQLIv8138bUby5PELfDipYYIDpJzH02c" \
+time curl \
+    -v \
+    -H "Content-Type: application/json" \
+    -d '{ "search_text": "found this board lainchan" }' \
+    -X POST http://localhost:3000/rpc/search_posts

sql/archive_tests.sql

@@ -589,12 +589,32 @@ $$;
 
 
 SELECT * FROM posts WHERE body_search_index @@ websearch_to_tsquery('english', 'holocaust');
-SELECT *,
-       ts_rank(body_search_index, websearch_to_tsquery('english', 'holocaust')) AS relevance
-FROM posts
-WHERE body_search_index @@ websearch_to_tsquery('english', 'holocaust')
+
+
+WITH query AS (
+  SELECT websearch_to_tsquery('english', 'Anonymous') AS query
+)
+SELECT p.*, ts_rank(p.body_search_index, query.query) AS relevance
+FROM posts p, query
+WHERE p.body_search_index @@ query.query
 ORDER BY relevance DESC;
 
+
+CREATE OR REPLACE FUNCTION search_posts(search_text TEXT)
+RETURNS SETOF posts
+AS $$
+SELECT p.*
+FROM posts p
+WHERE p.body_search_index @@ websearch_to_tsquery('english', search_text)
+ORDER BY ts_rank(p.body_search_index, websearch_to_tsquery('english', search_text)) DESC;
+$$ LANGUAGE sql STABLE;
+
+SELECT * FROM search_posts('found this board lainchan');
+
+SELECT * FROM information_schema.role_routine_grants;
+
+
+
 SELECT to_tsvector('english', body) FROM posts WHERE board_post_id = 476524;
 SELECT (setweight(to_tsvector('english', COALESCE(subject, '')), 'A') ||
     setweight(to_tsvector('english', COALESCE(name, '')), 'B') ||

sql/initialize.sql

@@ -267,9 +267,54 @@ RETURNS TABLE (
 $$ LANGUAGE sql;
 
 
+
+-- Function: search_posts
+-- 
+-- This function performs a full-text search on the `posts` table using PostgreSQL's text search features.
+-- It takes a single argument `search_text`, which represents the text to search for within the `posts` body content.
+-- The function is designed to return rows from the `posts` table where the `body_search_index` tsvector column matches
+-- the websearch to tsquery conversion of the input `search_text`. Results are ranked by their relevance to the search
+-- text, with the most relevant posts appearing first.
+-- 
+-- The function uses the `websearch_to_tsquery` function for parsing the provided search text into a tsquery object
+-- using the 'english' configuration. It then ranks the results using the `ts_rank` function based on the match
+-- between the `body_search_index` column and the tsquery object, ordering the posts from most to least relevant.
+-- 
+-- Note that the `relevance` score is used only for ordering the results; it is not included in the function's return set.
+-- 
+-- Parameters:
+--   - search_text: TEXT, the text to be searched in the `posts` body.
+--
+-- Returns:
+--   - A SETOF rows from the `posts` table ordered by the relevance of the full-text search.
+--
+-- Usage:
+--   SELECT * FROM search_posts('Desired search text');
+--
+-- The function is marked as STABLE, indicating that it does not modify the database and always returns the same
+-- results for the same input when the underlying data does not change.
+--
+-- Example:
+--   -- To search for posts related to 'quantum computing':
+--   SELECT * FROM search_posts('quantum computing');
+CREATE OR REPLACE FUNCTION search_posts(search_text TEXT)
+RETURNS SETOF posts
+AS $$
+SELECT p.*
+FROM posts p
+WHERE p.body_search_index @@ websearch_to_tsquery('english', search_text)
+ORDER BY ts_rank(p.body_search_index, websearch_to_tsquery('english', search_text)) DESC;
+$$ LANGUAGE sql STABLE;
+
+
 /*
  * Permissions
  */
+REVOKE EXECUTE ON FUNCTION insert_posts_and_return_ids FROM PUBLIC;
+REVOKE EXECUTE ON FUNCTION fetch_top_threads FROM PUBLIC;
+REVOKE EXECUTE ON FUNCTION fetch_catalog FROM PUBLIC;
+REVOKE EXECUTE ON FUNCTION search_posts FROM PUBLIC;
+REVOKE EXECUTE ON FUNCTION update_post_body_search_index FROM PUBLIC;
 
 CREATE ROLE chan_archive_anon nologin;
 GRANT CONNECT ON DATABASE chan_archives     TO chan_archive_anon;
@@ -278,6 +323,10 @@ GRANT SELECT ON boards                  TO chan_archive_anon;
 GRANT SELECT ON threads                     TO chan_archive_anon;
 GRANT SELECT ON posts                       TO chan_archive_anon;
 GRANT SELECT ON attachments                 TO chan_archive_anon;
+GRANT EXECUTE ON FUNCTION fetch_catalog     TO chan_archive_anon;
+GRANT EXECUTE ON FUNCTION fetch_top_threads TO chan_archive_anon;
+GRANT EXECUTE ON FUNCTION search_posts      TO chan_archive_anon;
+
 -- GRANT usage, select ON SEQUENCE sites_site_id_seq TO chan_archive_anon;
 -- GRANT usage, select ON SEQUENCE boards_board_id_seq TO chan_archive_anon;
 GRANT chan_archive_anon                 TO admin;
@@ -294,6 +343,7 @@ GRANT EXECUTE ON FUNCTION update_post_body_search_index TO chan_archiver;
 GRANT EXECUTE ON FUNCTION insert_posts_and_return_ids   TO chan_archiver;
 GRANT EXECUTE ON FUNCTION fetch_top_threads             TO chan_archiver;
 GRANT EXECUTE ON FUNCTION fetch_catalog                 TO chan_archiver;
+GRANT EXECUTE ON FUNCTION search_posts                  TO chan_archiver;
 GRANT usage, select ON SEQUENCE sites_site_id_seq       TO chan_archiver;
 GRANT usage, select ON SEQUENCE boards_board_id_seq     TO chan_archiver;
 GRANT usage, select ON SEQUENCE threads_thread_id_seq   TO chan_archiver;