add base template for manual fill

frontend/src/services/api.ts

@@ -711,6 +711,34 @@ export function useGetContractFile() {
     });
 }
 
+
+export function useGetContractFileTemplate() {
+    return useMutation({
+        mutationFn: async (form_id: number) => {
+            const res = await fetchWithAuth(`${Config.backend_uri}/contracts/${form_id}/base`)
+                .then((res) => res);
+
+            if (!res.ok) throw new Error();
+            const blob = await res.blob();
+            const disposition = res.headers.get("Content-Disposition");
+            const filename =
+                disposition && disposition?.includes("filename=")
+                    ? disposition.split("filename=")[1].replace(/"/g, "")
+                    : `contract_${form_id}.pdf`;
+            return { blob, filename };
+        },
+        onSuccess: ({ blob, filename }) => {
+            const url = URL.createObjectURL(blob);
+            const link = document.createElement("a");
+            link.href = url;
+            link.download = filename;
+            link.click();
+            URL.revokeObjectURL(url);
+        },
+    });
+}
+
+
 export function useGetRecap() {
     return useMutation({
         mutationFn: async (form_id: number) => {