rewrite rtdb in typescript, using apiv2 (#4568)

* rewrite rtdb in typescript, using apiv2

* use queryparams with apiv2 instead of putting it into the path

src/rtdb.ts

@@ -0,0 +1,47 @@
+import { Client } from "./apiv2";
+import { DatabaseInstance, populateInstanceDetails } from "./management/database";
+import { FirebaseError } from "./error";
+import { realtimeOriginOrCustomUrl } from "./database/api";
+import * as utils from "./utils";
+
+/**
+ * Updates rules, optionally specifying a dry run flag for validation purposes.
+ */
+export async function updateRules(
+  projectId: string,
+  instance: string,
+  src: any,
+  options: { dryRun?: boolean } = {}
+): Promise<void> {
+  const queryParams: { dryRun?: string } = {};
+  if (options.dryRun) {
+    queryParams.dryRun = "true";
+  }
+  const downstreamOptions: {
+    instance: string;
+    project: string;
+    instanceDetails?: DatabaseInstance;
+  } = { instance: instance, project: projectId };
+  await populateInstanceDetails(downstreamOptions);
+  if (!downstreamOptions.instanceDetails) {
+    throw new FirebaseError(`Could not get instance details`, { exit: 2 });
+  }
+  const origin = utils.getDatabaseUrl(
+    realtimeOriginOrCustomUrl(downstreamOptions.instanceDetails.databaseUrl),
+    instance,
+    ""
+  );
+  const client = new Client({ urlPrefix: origin });
+  const response = await client.request<any, any>({
+    method: "PUT",
+    path: ".settings/rules.json",
+    queryParams,
+    body: src,
+    resolveOnHTTPError: true,
+  });
+  if (response.status === 400) {
+    throw new FirebaseError(`Syntax error in database rules:\n\n${response.body.error}`);
+  } else if (response.status > 400) {
+    throw new FirebaseError("Unexpected error while deploying database rules.", { exit: 2 });
+  }
+}