Use SerializationService as a fallback for when patch application fails (#1030)

src/web/interface.rs

@@ -208,6 +208,44 @@ pub struct OpenResponse {
     pub session_id: SessionId,
 }
 
+#[derive(Debug, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct SerializeResponse {
+    pub session_id: SessionId,
+    pub model_contents: BufferEncode,
+}
+
+/// Using this struct we can force Roblox to JSONDecode this as a buffer.
+/// This is what Roblox's serde APIs use, so it saves a step in the plugin.
+#[derive(Debug, Serialize, Deserialize)]
+pub struct BufferEncode {
+    m: (),
+    t: Cow<'static, str>,
+    base64: String,
+}
+
+impl BufferEncode {
+    pub fn new(content: Vec<u8>) -> Self {
+        let base64 = data_encoding::BASE64.encode(&content);
+        Self {
+            m: (),
+            t: Cow::Borrowed("buffer"),
+            base64,
+        }
+    }
+
+    pub fn model(&self) -> &str {
+        &self.base64
+    }
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct RefPatchResponse<'a> {
+    pub session_id: SessionId,
+    pub patch: SubscribeMessage<'a>,
+}
+
 /// General response type returned from all Rojo routes
 #[derive(Debug, Serialize, Deserialize)]
 #[serde(rename_all = "camelCase")]