wip: add db classes; can't load SQLite driver.

apps/vdb-backend/src/auth.ts

@@ -0,0 +1,61 @@
+
+import { promises as fs } from "fs";
+import * as path from "path";
+import { authenticate } from "@google-cloud/local-auth";
+import { google } from "googleapis";
+import { OAuth2Client } from 'google-auth-library';
+
+
+//setup google auth
+const SCOPES = ["https://www.googleapis.com/auth/spreadsheets.readonly"];
+const TOKEN_PATH = path.join(process.cwd(), "res/token.secret.json");
+const CREDENTIALS_PATH = path.join(process.cwd(), "res/credentials.secret.json");
+
+
+/**
+ * Load or request or authorization to call APIs.
+*/
+
+export async function authorize() {
+  let client: any = await loadSavedCredentialsIfExist();
+  if (client) {
+    return client;
+  }
+  client = await authenticate({
+    scopes: SCOPES,
+    keyfilePath: CREDENTIALS_PATH,
+  });
+  if (client.credentials) {
+    await saveCredentials(client);
+  }
+  return client;
+}
+
+async function loadSavedCredentialsIfExist() {
+  try {
+    const content = await fs.readFile(TOKEN_PATH);
+    const credentials = JSON.parse(content.toString());
+    return google.auth.fromJSON(credentials);
+  } catch (err) {
+    return null;
+  }
+}
+
+/**
+ * Serializes credentials to a file compatible with GoogleAuth.fromJSON.
+ *
+ * @param {OAuth2Client} client
+ * @return {Promise<void>}
+ */
+async function saveCredentials(client: OAuth2Client) {
+  const content = await fs.readFile(CREDENTIALS_PATH);
+  const keys = JSON.parse(content.toString());
+  const key = keys.installed || keys.web;
+  const payload = JSON.stringify({
+    type: "authorized_user",
+    client_id: key.client_id,
+    client_secret: key.client_secret,
+    refresh_token: client.credentials.refresh_token,
+  });
+  await fs.writeFile(TOKEN_PATH, payload);
+}