All: Add support for sharing notebooks with Joplin Server (#4772)

- Joplin Server: Adds support for sharing a notebook
- Desktop: Adds support for sharing a notebook with Joplin Server
- Mobile: Adds support for reading and writing to a shared notebook (not possible to share a notebook)
- Cli: Adds support for reading and writing to a shared notebook (not possible to share a notebook)

packages/lib/debug/DebugService.ts

@@ -0,0 +1,47 @@
+import JoplinDatabase from '../JoplinDatabase';
+import Setting from '../models/Setting';
+import SyncTargetJoplinServer from '../SyncTargetJoplinServer';
+
+export default class DebugService {
+
+	private db_: JoplinDatabase;
+
+	public constructor(db: JoplinDatabase) {
+		this.db_ = db;
+	}
+
+	private get db(): JoplinDatabase {
+		return this.db_;
+	}
+
+	public async clearSyncState() {
+		const tableNames = [
+			'item_changes',
+			'deleted_items',
+			'sync_items',
+			'key_values',
+		];
+
+		const queries = [];
+		for (const n of tableNames) {
+			queries.push(`DELETE FROM ${n}`);
+			queries.push(`DELETE FROM sqlite_sequence WHERE name="${n}"`); // Reset autoincremented IDs
+		}
+
+		for (let i = 0; i < 20; i++) {
+			queries.push(`DELETE FROM settings WHERE key="sync.${i}.context"`);
+			queries.push(`DELETE FROM settings WHERE key="sync.${i}.auth"`);
+		}
+
+		await this.db.transactionExecBatch(queries);
+	}
+
+	public async setupJoplinServerUser(num: number) {
+		const id = SyncTargetJoplinServer.id();
+		Setting.setValue('sync.target', id);
+		Setting.setValue(`sync.${id}.path`, 'http://localhost:22300');
+		Setting.setValue(`sync.${id}.username`, `user${num}@example.com`);
+		Setting.setValue(`sync.${id}.password`, '123456');
+	}
+
+}