From 91d014a98dbae2daf7b71320fa95f437396e88b9 Mon Sep 17 00:00:00 2001
From: Isaac Adewumi <ienioladewumi@gmail.com>
Date: Wed, 16 Oct 2024 18:31:48 +0100
Subject: [PATCH] add valid conversion routes

---
 backend/bridgebloc/apps/conversions/urls.py  |  2 ++
 backend/bridgebloc/apps/conversions/views.py | 23 ++++++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/backend/bridgebloc/apps/conversions/urls.py b/backend/bridgebloc/apps/conversions/urls.py
index 67c7137..6af150e 100644
--- a/backend/bridgebloc/apps/conversions/urls.py
+++ b/backend/bridgebloc/apps/conversions/urls.py
@@ -2,12 +2,14 @@
 
 from .views import (
     CCTPTokenConversionInitialisationAPIView,
+    ValidTokenConversionRoutesAPIView,
     TokenConversionAPIView,
     TokenConversionsAPIView,
 )
 
 urlpatterns = [
     path('conversions', TokenConversionsAPIView.as_view(), name='all-conversions-by-user'),
+    path('conversions/routes', ValidTokenConversionRoutesAPIView.as_view(), name='conversion-routes'),
     path('conversions/cctp', CCTPTokenConversionInitialisationAPIView.as_view(), name='bridge-with-cctp'),
     path('conversions/<str:uuid>', TokenConversionAPIView.as_view(), name='get-conversion'),
 ]
diff --git a/backend/bridgebloc/apps/conversions/views.py b/backend/bridgebloc/apps/conversions/views.py
index 7cf82b5..462f643 100644
--- a/backend/bridgebloc/apps/conversions/views.py
+++ b/backend/bridgebloc/apps/conversions/views.py
@@ -1,3 +1,4 @@
+from collections import defaultdict
 from typing import Any
 
 from django.db import transaction
@@ -7,6 +8,7 @@
 from rest_framework.generics import GenericAPIView, ListAPIView, RetrieveAPIView
 from rest_framework.request import Request
 from rest_framework.response import Response
+from rest_framework.views import APIView
 
 from bridgebloc.apps.accounts.permissions import IsAuthenticated
 from bridgebloc.common.helpers import success_response
@@ -17,6 +19,27 @@
 from .permissions import IsOwner
 from .serializers import CCTPTokenConversionInitialisationSerializer, TokenConversionSerializer
 from .types import ConversionMethod
+from ...evm.types import ChainID
+
+
+class ValidTokenConversionRoutesAPIView(APIView):
+    def get(self, request: Request, *args: Any, **kwargs: Any) -> Response:  # noqa: ARG002
+        data: dict[str, Any] = defaultdict(lambda: defaultdict())  # pylint:disable=unnecessary-lambda
+
+        mainnet_chains = [chain for chain in ChainID if not chain.name.endswith('TESTNET')]
+        testnet_chains = [chain for chain in ChainID if chain.name.endswith('TESTNET')]
+
+        for source_chain in mainnet_chains:
+            for target_chain in mainnet_chains:
+                if source_chain != target_chain:
+                    data[source_chain.name.lower()][target_chain.name.lower()] = ConversionMethod.CCTP
+
+        for source_chain in testnet_chains:
+            for target_chain in testnet_chains:
+                if source_chain != target_chain:
+                    data[source_chain.name.lower()][target_chain.name.lower()] = ConversionMethod.CCTP
+
+        return success_response(data=data)
 
 
 class TokenConversionAPIView(RetrieveAPIView):