1 files changed, 44 insertions, 0 deletions

diff --git a/src/validators.rs b/src/validators.rs
new file mode 100644
index 0000000..dbebee8
--- /dev/null
+++ b/src/validators.rs
@@ -0,0 +1,44 @@
+// Custom validators incoming data
+
+use log::error;
+use serde::de::{Deserializer, Error as DeserializerError, Unexpected};
+use serde::ser::{Error as SerializerError, Serializer};
+use serde::Deserialize;
+
+pub mod validate_game_rating {
+    use super::*;
+
+    const ERROR_MESSAGE: &str = "rating must be a number between 0 and 100";
+
+    pub fn deserialize<'de, D>(deserializer: D) -> Result<u8, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        let value = u8::deserialize(deserializer)?;
+
+        if value > 100 {
+            error!("{}", ERROR_MESSAGE);
+
+            return Err(DeserializerError::invalid_value(
+                Unexpected::Unsigned(u64::from(value)),
+                &ERROR_MESSAGE,
+            ));
+        }
+
+        Ok(value)
+    }
+
+    #[allow(clippy::trivially_copy_pass_by_ref)]
+    pub fn serialize<S>(value: &u8, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        if *value > 100 {
+            error!("{}", ERROR_MESSAGE);
+
+            return Err(SerializerError::custom(ERROR_MESSAGE));
+        }
+
+        serializer.serialize_u8(*value)
+    }
+}