feat: add validate-handle endpoint to check ownership of handle under ENS names

Author: trsmarc

clk-gateway/src/graphql/index.ts

@@ -0,0 +1,41 @@
+export const FIND_HANDLE_OWNERSHIP = (name: string, handle: string, service: string) => `
+    query FindHandleOwnership {
+        eNs(filter: {
+            name: {
+            equalTo : "${name.toLowerCase()}"
+            }
+        }, first: 1) {
+            nodes {
+                name
+                textRecords(filter: {
+                    key: {
+                        equalTo: "${service.toLowerCase()}"
+                    },
+                    value: {
+                        equalTo: "${handle.toLowerCase()}"
+                    }
+                }) {
+                    nodes {
+                        key
+                        value
+                    }
+                }
+            }
+        }
+    }
+`
+export type FindHandleOwnershipResponse = {
+    data: {
+        eNs: {
+            nodes: {
+                name: string
+                textRecords: {
+                    nodes: {
+                        key: string
+                        value: string
+                    }[]
+                }
+            }[]
+        }
+    }
+}