feat: add push config wrapper fields

PiperOrigin-RevId: 534994946

google/pubsub/v1/pubsub.proto

@@ -903,6 +903,19 @@ message PushConfig {
     string audience = 2;
   }
 
+  // The payload to the push endpoint is in the form of the JSON representation
+  // of a PubsubMessage
+  // (https://cloud.google.com/pubsub/docs/reference/rpc/google.pubsub.v1#pubsubmessage).
+  message PubsubWrapper {}
+
+  // Sets the `data` field as the HTTP body for delivery.
+  message NoWrapper {
+    // When true, writes the Pub/Sub message metadata to
+    // `x-goog-pubsub-<KEY>:<VAL>` headers of the HTTP request. Writes the
+    // Pub/Sub message attributes to `<KEY>:<VAL>` headers of the HTTP request.
+    bool write_metadata = 1;
+  }
+
   // A URL locating the endpoint to which messages should be pushed.
   // For example, a Webhook endpoint might use `https://example.com/push`.
   string push_endpoint = 1;
@@ -940,6 +953,18 @@ message PushConfig {
     // `Authorization` header in the HTTP request for every pushed message.
     OidcToken oidc_token = 3;
   }
+
+  // The format of the delivered message to the push endpoint is defined by
+  // the chosen wrapper. When unset, `PubsubWrapper` is used.
+  oneof wrapper {
+    // When set, the payload to the push endpoint is in the form of the JSON
+    // representation of a PubsubMessage
+    // (https://cloud.google.com/pubsub/docs/reference/rpc/google.pubsub.v1#pubsubmessage).
+    PubsubWrapper pubsub_wrapper = 4;
+
+    // When set, the payload to the push endpoint is not wrapped.
+    NoWrapper no_wrapper = 5;
+  }
 }
 
 // Configuration for a BigQuery subscription.