feat(router): add duplication_check field in stored card response

src/routes/data.rs

@@ -8,6 +8,8 @@ use axum::middleware;
 
 use masking::ExposeInterface;
 
+use types::StoreCardResponse;
+
 use crate::{
     app::AppState,
     crypto::{aes::GcmAes256, sha::Sha512},
@@ -94,7 +96,7 @@ pub async fn add_card(
 
     let optional_hash_table = state.db.find_by_data_hash(&hash_data).await?;
 
-    let output = match optional_hash_table {
+    let (duplication_check, output) = match optional_hash_table {
         Some(hash_table) => {
             let stored_data = state
                 .db
@@ -107,7 +109,10 @@ pub async fn add_card(
                 )
                 .await?;
 
-            match stored_data {
+            let duplication_check =
+                transformers::validate_card_metadata(stored_data.as_ref(), &request.data)?;
+
+            let output = match stored_data {
                 Some(data) => data,
                 None => {
                     state
@@ -123,12 +128,14 @@ pub async fn add_card(
                         )
                         .await?
                 }
-            }
+            };
+
+            (duplication_check, output)
         }
         None => {
             let hash_table = state.db.insert_hash(hash_data).await?;
 
-            state
+            let output = state
                 .db
                 .insert_or_get_from_locker(
                     (
@@ -139,11 +146,13 @@ pub async fn add_card(
                         .try_into()?,
                     &merchant_dek,
                 )
-                .await?
+                .await?;
+
+            (None, output)
         }
     };
 
-    Ok(Json(output.into()))
+    Ok(Json(StoreCardResponse::from((duplication_check, output))))
 }
 
 /// `/data/delete` handling the requirement of deleting cards

src/routes/data/transformers.rs

@@ -6,7 +6,7 @@ use crate::{
     storage,
 };
 
-use super::types;
+use super::types::{self, DataDuplicationCheck};
 
 impl<'a> TryFrom<(super::types::StoreCardRequest, &'a str, &'a str)>
     for storage::types::LockerNew<'a>
@@ -38,12 +38,17 @@ impl<'a> TryFrom<(super::types::StoreCardRequest, &'a str, &'a str)>
     }
 }
 
-impl From<storage::types::Locker> for super::types::StoreCardResponse {
-    fn from(value: storage::types::Locker) -> Self {
+impl From<(Option<DataDuplicationCheck>, storage::types::Locker)>
+    for super::types::StoreCardResponse
+{
+    fn from(
+        (duplication_check, value): (Option<DataDuplicationCheck>, storage::types::Locker),
+    ) -> Self {
         Self {
             status: types::Status::Ok,
             payload: Some(super::types::StoreCardRespPayload {
                 card_reference: value.locker_id.expose(),
+                duplication_check,
                 dedup: None,
             }),
         }
@@ -71,6 +76,18 @@ impl TryFrom<storage::types::Locker> for super::types::RetrieveCardResponse {
     }
 }
 
+impl std::cmp::PartialEq<types::Data> for super::types::StoredData {
+    fn eq(&self, other: &types::Data) -> bool {
+        match (self, other) {
+            (Self::EncData(request_enc_card_data), types::Data::EncData { enc_card_data }) => {
+                request_enc_card_data == enc_card_data
+            }
+            (Self::CardData(request_card), types::Data::Card { card }) => request_card == card,
+            _ => false,
+        }
+    }
+}
+
 /// Generate UUID v4 as strings to be used in storage layer
 pub fn generate_uuid() -> String {
     uuid::Uuid::new_v4().to_string()
@@ -98,3 +115,23 @@ where
 
     Ok(hash_data)
 }
+
+pub fn validate_card_metadata(
+    stored_payload: Option<&storage::types::Locker>,
+    request_data: &types::Data,
+) -> Result<Option<DataDuplicationCheck>, ContainerError<error::ApiError>> {
+    stored_payload
+        .map(|stored_data| {
+            let stored_data =
+                serde_json::from_slice::<types::StoredData>(stored_data.enc_data.peek())
+                    .change_error(error::ApiError::DecodingError)?;
+
+            let is_metadata_duplicated = stored_data.eq(request_data);
+
+            Ok(match is_metadata_duplicated {
+                true => DataDuplicationCheck::Duplicated,
+                false => DataDuplicationCheck::MetaDataChanged,
+            })
+        })
+        .transpose()
+}

src/routes/data/types.rs

@@ -11,7 +11,7 @@ use masking::PeekInterface;
 
 use crate::error;
 
-#[derive(serde::Serialize, serde::Deserialize, Debug)]
+#[derive(serde::Serialize, serde::Deserialize, Debug, PartialEq, Eq)]
 pub struct Card {
     pub card_number: masking::StrongSecret<String>,
     name_on_card: Option<String>,
@@ -25,9 +25,17 @@ pub struct Card {
 #[derive(serde::Serialize, serde::Deserialize, Debug)]
 pub struct StoreCardRespPayload {
     pub card_reference: String,
+    pub duplication_check: Option<DataDuplicationCheck>,
     pub dedup: Option<DedupResponsePayload>,
 }
 
+#[derive(serde::Serialize, serde::Deserialize, Debug)]
+#[serde(rename_all = "snake_case")]
+pub enum DataDuplicationCheck {
+    Duplicated,
+    MetaDataChanged,
+}
+
 #[derive(serde::Serialize, serde::Deserialize, Debug)]
 pub struct DedupResponsePayload {
     hash1_reference: Option<String>,
@@ -48,7 +56,7 @@ pub struct StoreCardRequest {
     pub data: Data,
 }
 
-#[derive(serde::Serialize, serde::Deserialize, Debug)]
+#[derive(serde::Serialize, serde::Deserialize, Debug, PartialEq)]
 #[serde(untagged)]
 pub enum Data {
     EncData { enc_card_data: String },
@@ -94,7 +102,7 @@ pub struct DeleteCardResponse {
     pub status: Status,
 }
 
-#[derive(serde::Serialize, serde::Deserialize)]
+#[derive(serde::Serialize, serde::Deserialize, PartialEq, Eq)]
 pub enum StoredData {
     EncData(String),
     CardData(Card),