fix issues with db connection in backup process

Author: dani-beltran

src/config.ts

@@ -29,17 +29,9 @@ function getEnvOrThrow(key: string): string {
 }
 
 export function loadConfig(): Config {
-  let auth = '';
-  let host = process.env.MONGODB_HOST || 'localhost:27017';
-  let srv = process.env.MONGO_SRV ? '+srv' : '';
-
-  if (process.env.MONGO_INITDB_ROOT_USERNAME) {
-    auth = `${process.env.MONGO_INITDB_ROOT_USERNAME}:${process.env.MONGO_INITDB_ROOT_PASSWORD}@`;
-  }
-
   return {
     mongodb: {
-      uri: `mongodb${srv}://${auth}${host}`,
+      uri: buildMongoUri(),
       database: getEnvOrThrow("MONGODB_DATABASE"),
     },
     aws: {
@@ -55,3 +47,23 @@ export function loadConfig(): Config {
     mongodumpPath: process.env.MONGODUMP_PATH || "mongodump",
   };
 }
+
+function buildMongoUri(): string {
+  let auth = '';
+  let host = process.env.MONGODB_HOST || 'localhost:27017';
+  host = host.endsWith('/') ? host.slice(0, -1) : host;
+  let srv = process.env.MONGO_SRV ? '+srv' : '';
+  let queryParams = '';
+
+  if (process.env.MONGO_INITDB_ROOT_USERNAME) {
+    const username = encodeURIComponent(process.env.MONGO_INITDB_ROOT_USERNAME);
+    const password = encodeURIComponent(process.env.MONGO_INITDB_ROOT_PASSWORD || '');
+    auth = `${username}:${password}@`;
+  }
+
+  // Add authSource if specified
+  if (process.env.MONGO_AUTH_SOURCE) {
+    queryParams = `authSource=${process.env.MONGO_AUTH_SOURCE}`;
+  }
+  return `mongodb${srv}://${auth}${host}/?${queryParams}`;
+}