feat(events): add hashed customer_email and feature_metadata (#5220)

Co-authored-by: hyperswitch-bot[bot] <148525504+hyperswitch-bot[bot]@users.noreply.github.com>

crates/common_utils/src/hashing.rs

@@ -0,0 +1,22 @@
+use masking::{PeekInterface, Secret, Strategy};
+use serde::{Deserialize, Serialize, Serializer};
+
+#[derive(Clone, Debug, Deserialize)]
+/// Represents a hashed string using blake3's hashing strategy.
+pub struct HashedString<T: Strategy<String>>(Secret<String, T>);
+
+impl<T: Strategy<String>> Serialize for HashedString<T> {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        let hashed_value = blake3::hash(self.0.peek().as_bytes()).to_hex();
+        hashed_value.serialize(serializer)
+    }
+}
+
+impl<T: Strategy<String>> From<Secret<String, T>> for HashedString<T> {
+    fn from(value: Secret<String, T>) -> Self {
+        Self(value)
+    }
+}

crates/common_utils/src/lib.rs

@@ -31,6 +31,8 @@ pub mod static_cache;
 pub mod types;
 pub mod validation;
 
+/// Used for hashing
+pub mod hashing;
 #[cfg(feature = "metrics")]
 pub mod metrics;
 

crates/common_utils/src/pii.rs

@@ -14,6 +14,7 @@ use error_stack::ResultExt;
 use masking::{ExposeInterface, Secret, Strategy, WithType};
 #[cfg(feature = "logs")]
 use router_env::logger;
+use serde::Deserialize;
 
 use crate::{
     crypto::Encryptable,
@@ -205,7 +206,7 @@ where
 }
 
 /// Strategy for masking Email
-#[derive(Debug)]
+#[derive(Debug, Copy, Clone, Deserialize)]
 pub enum EmailStrategy {}
 
 impl<T> Strategy<T> for EmailStrategy