Return category if present in downloaded offchain metadata (#264)

* Fix docker build

* Fix clippy error

* Add category to RPC response for content, if present

Author: danenbm

digital_asset_types/src/dapi/common/asset.rs

@@ -211,7 +211,8 @@ pub fn v1_content_from_json(asset_data: &asset_data::Model) -> Result<Content, D
             links.insert(f.to_string(), l.to_owned());
         }
     }
-    let _metadata = safe_select(selector, "description");
+    let category = safe_select(selector, "$.properties.category").cloned();
+
     let mut actual_files: HashMap<String, File> = HashMap::new();
     if let Some(files) = selector("$.properties.files[*]")
         .ok()
@@ -280,6 +281,7 @@ pub fn v1_content_from_json(asset_data: &asset_data::Model) -> Result<Content, D
         files: Some(files),
         metadata: meta,
         links: Some(links),
+        category,
     })
 }
 

digital_asset_types/src/rpc/asset.rs

@@ -180,6 +180,8 @@ pub struct Content {
     pub metadata: MetadataMap,
     #[serde(skip_serializing_if = "Option::is_none")]
     pub links: Option<Links>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub category: Option<Value>,
 }
 
 #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)]