google_analytics: add base64 credentials option

Author: sanjushahgupta

docs/supported-sources/google_analytics.md

@@ -9,10 +9,15 @@ The URI format for Google Analytics is as follows:
 ```plaintext
 googleanalytics://?credentials_path=/path/to/service/account.json&property_id=<property_id>
 ```
+Alternatively, you can use base64 encoded credentials:
+
+```
+googleanalytics://?credentials_base64=<base64_encoded_credentials>&property_id=<property_id>
+```
 
 URI parameters:
 - `credentials_path`: The path to the service account JSON file.
-- `property_id`: It is a unique number that identifies a particular property on Google Analytics. [Follow this guide](https://developers.google.com/analytics/devguides/reporting/data/v1/property-id#what_is_my_property_id) if you don't know your property ID.
+- `property_id`: It is a unique number that identifies a particular property on Google Analytics. [Follow this guide](https://developers.google.com/analytics/devguides/reporting/data/v1/property-id#what_is_my_property_id) to know more about property ID.
 
 ## Setting up an Google Analytics Integration
 Google Analytics requires a few steps to set up an integration, please follow the guide dltHub [has built here](https://dlthub.com/docs/dlt-ecosystem/verified-sources/google_analytics#grab-google-service-account-credentials). Once you complete the guide, you should have an `.json` file  and `project_id`. 

ingestr/src/sources.py

@@ -1398,13 +1398,19 @@ def dlt_source(self, uri: str, table: str, **kwargs):
         parse_uri = urlparse(uri)
         source_fields = parse_qs(parse_uri.query)
         cred_path = source_fields.get("credentials_path")
+        cred_base64 = source_fields.get("credentials_base64")
 
-        if not cred_path:
-            raise ValueError("credentials_path is required to connect Google Analytics")
-        credentials = {}
+        if not cred_path and not cred_base64:
+            raise ValueError("credentials_path or credentials_base64 is required to connect Google Analytics")
 
-        with open(cred_path[0], "r") as f:
-            credentials = json.load(f)
+        credentials = {}
+        if cred_path:
+            with open(cred_path[0], "r") as f:
+                credentials = json.load(f)
+        elif cred_base64:
+            credentials = json.loads(
+                base64.b64decode(cred_base64[0]).decode("utf-8")
+            )
 
         property_id = source_fields.get("property_id")
         if not property_id: