feat: auth service logic for purging expired unverified accounts upon registration, new sql queries for this purpose

sqlc/query.sql

@@ -56,6 +56,29 @@ SELECT users.* FROM users
 JOIN login_informations linfo ON linfo.user_id = users.id
 WHERE linfo.email = @email::text;
 
+;-- name: CheckUserRegistrationAvailability :one
+-- SELECT 
+--   COUNT(users.username = @username::text) > 0 AS username_busy,
+--   COUNT(linfo.email = @email::text) > 0 AS email_busy
+-- FROM users
+-- JOIN login_informations AS linfo on linfo.user_id = users.id
+-- WHERE
+--   (
+--     users.username = @username::text OR 
+--     linfo.email = @email::text
+--   )
+--   AND
+--   (
+--     users.verified IS TRUE OR
+--     COUNT(
+--       SELECT confirmation_codes as codes 
+--       JOIN users on users.id = codes.user_id
+--       WHERE codes.code_type = 0 AND
+--       codes.deleted IS FALSE AND
+--       codes.expires_at < CURRENT_TIMESTAMP
+--     ) = 0;
+--   )
+
 ;-- name: GetValidUserByLoginCredentials :one
 SELECT
   users.id,
@@ -72,6 +95,46 @@ WHERE
   banned.user_id IS NULL AND -- Not banned
   linfo.password_hash = crypt(@password::text, linfo.password_hash); -- Password hash matches
 
+;-- name: CheckUserRegistrationAvailability :one
+SELECT 
+  COUNT(CASE WHEN users.username = @username::text THEN 1 END) > 0 AS username_busy,
+  COUNT(CASE WHEN linfo.email = @email::text THEN 1 END) > 0 AS email_busy
+FROM users
+JOIN login_informations AS linfo ON linfo.user_id = users.id
+WHERE
+  (
+    users.username = @username::text OR 
+    linfo.email = @email::text
+  )
+  AND
+  (
+    users.verified IS TRUE OR
+    NOT EXISTS (
+      SELECT 1
+      FROM confirmation_codes AS codes
+      WHERE codes.user_id = users.id
+        AND codes.code_type = 0
+        AND codes.deleted IS FALSE
+        AND codes.expires_at > CURRENT_TIMESTAMP
+    )
+  );
+
+;-- name: DeleteUnverifiedAccountsHavingUsernameOrEmail :one
+WITH deleted_rows AS (
+  DELETE FROM users
+  WHERE 
+    (username = @username::text OR 
+     EXISTS (
+       SELECT 1
+       FROM login_informations AS linfo
+       WHERE linfo.user_id = users.id
+         AND linfo.email = @email::text
+     ))
+    AND verified IS FALSE
+  RETURNING *
+)
+SELECT COUNT(*) AS deleted_count FROM deleted_rows;
+
 --: }}}
 
 --: Banned User Object {{{
@@ -146,6 +209,15 @@ WHERE
   used IS FALSE AND
   code_hash = crypt(@code::text, code_hash);
 
+;-- name: GetValidConfirmationCodesByUsername :many
+SELECT * FROM confirmation_codes
+JOIN users on users.id = confirmation_codes.user_id
+WHERE 
+  users.username = @username::text AND
+  code_type = @code_type::integer AND
+  expires_at > CURRENT_TIMESTAMP AND
+  used IS FALSE;
+
 ;-- name: UpdateConfirmationCode :exec
 UPDATE confirmation_codes
 SET