1 files changed, 30 insertions, 0 deletions
diff --git a/users/wpcarro/assessments/tt/src/LoginAttempts.hs b/users/wpcarro/assessments/tt/src/LoginAttempts.hs
new file mode 100644
index 000000000000..d78e12e3fd8a
--- /dev/null
+++ b/users/wpcarro/assessments/tt/src/LoginAttempts.hs
@@ -0,0 +1,30 @@
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE RecordWildCards #-}
+--------------------------------------------------------------------------------
+module LoginAttempts where
+--------------------------------------------------------------------------------
+import Database.SQLite.Simple
+
+import qualified Types as T
+--------------------------------------------------------------------------------
+
+reset :: FilePath -> T.Username -> IO ()
+reset dbFile username = withConnection dbFile $ \conn ->
+  execute conn "UPDATE LoginAttempts SET numAttempts = 0 WHERE username = ?"
+    (Only username)
+
+-- | Attempt to return the number of failed login attempts for
+-- `username`. Returns a Maybe in case `username` doesn't exist.
+forUsername :: FilePath -> T.Username -> IO (Maybe Integer)
+forUsername dbFile username = withConnection dbFile $ \conn -> do
+  res <- query conn "SELECT username,numAttempts FROM LoginAttempts WHERE username = ?"
+    (Only username)
+  case res of
+    [T.LoginAttempt{..}] -> pure (Just loginAttemptNumAttempts)
+    _  -> pure Nothing
+
+-- | INSERT a failed login attempt for `username` or UPDATE an existing entry.
+increment :: FilePath -> T.Username -> IO ()
+increment dbFile username = withConnection dbFile $ \conn ->
+  execute conn "INSERT INTO LoginAttempts (username,numAttempts) VALUES (?,?) ON CONFLICT (username) DO UPDATE SET numAttempts = numAttempts + 1"
+    (username, 1 :: Integer)