Usync: Barebones Usync Protocol support (#960)

* feature(feature/usync-mex): initial commit

* chore: fix merge commit

* chore:lint

src/WAUSync/Protocols/USyncStatusProtocol.ts

@@ -0,0 +1,44 @@
+import { USyncQueryProtocol } from '../../Types/USync'
+import { assertNodeErrorFree, BinaryNode } from '../../WABinary'
+
+export type StatusData = {
+	status?: string | null
+	setAt?: Date
+}
+
+export class USyncStatusProtocol implements USyncQueryProtocol {
+	name = 'status'
+
+	getQueryElement(): BinaryNode {
+		return {
+			tag: 'status',
+			attrs: {},
+		}
+	}
+
+	getUserElement(): null {
+		return null
+	}
+
+	parser(node: BinaryNode): StatusData | undefined {
+		if(node.tag === 'status') {
+			assertNodeErrorFree(node)
+			let status: string | null = node?.content!.toString()
+			const setAt = new Date(+(node?.attrs.t || 0) * 1000)
+			if(!status) {
+				if(+node.attrs?.code === 401) {
+					status = ''
+				} else {
+					status = null
+				}
+			} else if(typeof status === 'string' && status.length === 0) {
+				status = null
+			}
+
+			return {
+				status,
+				setAt,
+			}
+		}
+	}
+}