Add support for extended attributes

app/models/fs/Node.model.js

@@ -22,6 +22,12 @@ class Node extends Model {
             descriptor_type: { type: String, default: NodeDescriptorType.File },
             uploaded_file_id: String,
 
+            extended_attributes: [{
+                name: String,
+                value: String,  // base64 encoded binary buffer value
+                // There's position, but it's legacy for macOS, so going to exclude it for now.
+            }],
+
             deleted: { type: Boolean, default: false },
             root: { type: Boolean, default: false },
         }
@@ -56,6 +62,8 @@ class Node extends Model {
     }
 
     static async get_path(path, workspace = 'mainline') {
+        if ( path === '/' ) return this.get_root()
+
         const [pied_parent_path, pied_name] = this.path_parts(path)
 
         const nodes = await this.find({
@@ -142,6 +150,28 @@ class Node extends Model {
         return [...nodes, ...mainline_nodes].filter(x => !x.deleted)
     }
 
+    set_xattr(name, value) {
+        this.guarantee_xattrs()
+        this.remove_xattr(name)
+        this.extended_attributes.push({ name, value })
+    }
+
+    get_xattr(name) {
+        this.guarantee_xattrs()
+        return this.extended_attributes.find(attr => attr.name === name)
+    }
+
+    remove_xattr(name) {
+        this.guarantee_xattrs()
+        this.extended_attributes = this.extended_attributes.filter(attr => attr.name !== name)
+    }
+
+    guarantee_xattrs() {
+        if ( !Array.isArray(this.extended_attributes) ) {
+            this.extended_attributes = []
+        }
+    }
+
     to_api() {
         return {
             pied_name: this.pied_name,