feat(compatibility): add support for stripe compatible webhooks (#1728)

crates/router/src/core/webhooks/transformers.rs

@@ -1 +0,0 @@
-

crates/router/src/core/webhooks/types.rs

@@ -0,0 +1,45 @@
+use api_models::webhooks;
+use common_utils::{crypto::SignMessage, ext_traits};
+use error_stack::ResultExt;
+use serde::Serialize;
+
+use crate::{core::errors, headers, services::request::Maskable};
+
+pub trait OutgoingWebhookType:
+    Serialize + From<webhooks::OutgoingWebhook> + Sync + Send + std::fmt::Debug
+{
+    fn get_outgoing_webhooks_signature(
+        &self,
+        payment_response_hash_key: Option<String>,
+    ) -> errors::CustomResult<Option<String>, errors::WebhooksFlowError>;
+
+    fn add_webhook_header(header: &mut Vec<(String, Maskable<String>)>, signature: String);
+}
+
+impl OutgoingWebhookType for webhooks::OutgoingWebhook {
+    fn get_outgoing_webhooks_signature(
+        &self,
+        payment_response_hash_key: Option<String>,
+    ) -> errors::CustomResult<Option<String>, errors::WebhooksFlowError> {
+        let webhook_signature_payload =
+            ext_traits::Encode::<serde_json::Value>::encode_to_string_of_json(self)
+                .change_context(errors::WebhooksFlowError::OutgoingWebhookEncodingFailed)
+                .attach_printable("failed encoding outgoing webhook payload")?;
+
+        Ok(payment_response_hash_key
+            .map(|key| {
+                common_utils::crypto::HmacSha512::sign_message(
+                    &common_utils::crypto::HmacSha512,
+                    key.as_bytes(),
+                    webhook_signature_payload.as_bytes(),
+                )
+            })
+            .transpose()
+            .change_context(errors::WebhooksFlowError::OutgoingWebhookSigningFailed)
+            .attach_printable("Failed to sign the message")?
+            .map(hex::encode))
+    }
+    fn add_webhook_header(header: &mut Vec<(String, Maskable<String>)>, signature: String) {
+        header.push((headers::X_WEBHOOK_SIGNATURE.to_string(), signature.into()))
+    }
+}