some progress

node_modules/mongodb/lib/cmap/auth/plain.js

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+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Plain = void 0;
+const bson_1 = require("../../bson");
+const error_1 = require("../../error");
+const utils_1 = require("../../utils");
+const auth_provider_1 = require("./auth_provider");
+class Plain extends auth_provider_1.AuthProvider {
+    auth(authContext, callback) {
+        const { connection, credentials } = authContext;
+        if (!credentials) {
+            return callback(new error_1.MongoMissingCredentialsError('AuthContext must provide credentials.'));
+        }
+        const username = credentials.username;
+        const password = credentials.password;
+        const payload = new bson_1.Binary(Buffer.from(`\x00${username}\x00${password}`));
+        const command = {
+            saslStart: 1,
+            mechanism: 'PLAIN',
+            payload: payload,
+            autoAuthorize: 1
+        };
+        connection.command((0, utils_1.ns)('$external.$cmd'), command, undefined, callback);
+    }
+}
+exports.Plain = Plain;
+//# sourceMappingURL=plain.js.map