Implement getting data using rest api

backend/api-docs.txt

@@ -86,3 +86,40 @@ Add User:-
         This will give a response status 200 with no data if login is done.
         This will return a 403 if the user gave wrong name or password.
 _____________________
+
+
+_____________________
+Get Data:-
+    URL:- /get_data
+
+    Method:- POST
+
+    Data:- None
+
+    Response:-
+        200 OK:-
+            Data:- All user data
+            Note:- 
+                data:- {
+                    entry_name: {
+                        field_name: field_value
+                    }
+                }
+        403 Forbidden:-
+            Data:- Text that can be directly displayed to the user
+            Note:- Not logged in
+
+
+    Example:-
+        {
+            "Amazon": {
+                "Username": "Kosh",
+                "Password": "Pass1234"
+            },
+            "Matrix": {
+                "Username": "Kosh",
+                "Email": "kosh@fake.com",
+                "id": "@kosh:matrix.com"
+            }
+        }
+_____________________

backend/rest_api.py

@@ -1,9 +1,9 @@
 from os import mkdir, path
 from flask import Flask, request, send_file, abort, Response
 from werkzeug.datastructures import ImmutableMultiDict
-
-from data_handler import DataHandler
 import appdirs
+import json
+from data_handler import DataHandler
 
 
 app: Flask = Flask(__name__)
@@ -39,7 +39,7 @@ class QueryHandler:
     """
     This is the bridge between the frontend and DataHandler class
     """
-    __data_handler: DataHandler
+    __data_handler: DataHandler| None = None
 
     @staticmethod
     @app.post("/login")
@@ -104,6 +104,24 @@ class QueryHandler:
 
         return Response(status=200)
 
+    @staticmethod
+    @app.post("/get_data")
+    def get_data() -> Response:
+        """
+        Return all user data
+        """
+        if QueryHandler.__data_handler is None:
+            return Response(
+                    "Not logged in",
+                    403,
+                    content_type="text/plain"
+            )
+        return Response(
+                json.dumps(QueryHandler.__data_handler.get_data()),
+                200,
+                content_type="application/json"
+        )
+
 import os
 from os import path