import { ToolAnnotations } from "@modelcontextprotocol/sdk/types.js";
import { getCurrentAccountKeys, getNetwork } from "../shared/account.js";
import { Contract, getDefaultProvider, Wallet } from "@coti-io/coti-ethers";
import { ERC721_ABI } from "../constants/abis.js";
import { z } from "zod";
export const GET_PRIVATE_ERC721_APPROVED: ToolAnnotations = {
title: "Get Private ERC721 Approved",
name: "get_private_erc721_approved",
description:
"Get the approved address for a private ERC721 NFT token on the COTI blockchain. " +
"This is used for checking which address is currently approved to transfer a specific NFT. " +
"Requires token contract address and token ID as input. " +
"Returns the address that is approved to transfer the specified NFT.",
inputSchema: {
token_address: z.string().describe("ERC721 token contract address on COTI blockchain"),
token_id: z.string().describe("ID of the NFT token to check approval for"),
},
};
/**
* Checks if the provided arguments are valid for the get_private_erc721_approved tool.
* @param args The arguments to validate
* @returns true if the arguments are valid, false otherwise
*/
export function isGetPrivateERC721ApprovedArgs(args: unknown): args is { token_address: string, token_id: string } {
return (
typeof args === "object" &&
args !== null &&
"token_address" in args &&
typeof (args as { token_address: string }).token_address === "string" &&
"token_id" in args &&
typeof (args as { token_id: string }).token_id === "string"
);
}
/**
* Handler for the getPrivateERC721Approved tool
* @param args The arguments for the tool
* @returns The tool response
*/
export async function getPrivateERC721ApprovedHandler(args: Record<string, unknown> | undefined): Promise<any> {
if (!isGetPrivateERC721ApprovedArgs(args)) {
throw new Error("Invalid arguments for get_private_erc721_approved");
}
const { token_address, token_id } = args;
const results = await performGetPrivateERC721Approved(token_address, token_id);
return {
content: [{ type: "text", text: results }],
isError: false,
};
}
/**
* Gets the approved address for a private ERC721 NFT token
* @param token_address The address of the ERC721 token contract
* @param token_id The ID of the token to check approval for
* @returns A formatted string with the approval information
*/
export async function performGetPrivateERC721Approved(token_address: string, token_id: string) {
try {
const provider = getDefaultProvider(getNetwork());
const currentAccountKeys = getCurrentAccountKeys();
const wallet = new Wallet(currentAccountKeys.privateKey, provider);
wallet.setAesKey(currentAccountKeys.aesKey);
const tokenContract = new Contract(token_address, ERC721_ABI, wallet);
const name = await tokenContract.name();
const symbol = await tokenContract.symbol();
// Check that the token exists by getting its owner
const owner = await tokenContract.ownerOf(token_id);
// Get the approved address for the token
const approved = await tokenContract.getApproved(token_id);
let approvalStatus = "No address is currently approved to transfer this token.";
if (approved && approved !== "0x0000000000000000000000000000000000000000") {
approvalStatus = `Approved address: ${approved}`;
}
return `Token: ${name} (${symbol})\nToken ID: ${token_id}\nOwner: ${owner}\n${approvalStatus}`;
} catch (error) {
console.error('Error getting private ERC721 approved address:', error);
throw new Error(`Failed to get private ERC721 approved address: ${error instanceof Error ? error.message : String(error)}`);
}
}
