@iexec/web3telegram/src/utils/resolveDappAddressFromCompass.ts

Enables secure, blockchain-based messaging by encrypting Telegram user IDs for privacy. It lets users message Ethereum account holders without knowing their Telegram details.

import { CompassCallError } from 'iexec/errors';
import { AddressOrENS } from '../web3telegram/types.js';

export async function resolveDappAddressFromCompass(
  compassUrl: string,
  chainId: number
): Promise<AddressOrENS | undefined> {
  if (!compassUrl) {
    return undefined;
  }

  return (
    fetch(`${compassUrl}/${chainId}/iapps/web3telegram`)
      // Handle network errors
      .catch((error) => {
        throw new CompassCallError(
          `Connection to ${compassUrl} failed with a network error`,
          error
        );
      })
      // Handle server errors
      .then((response) => {
        if (response.status >= 500 && response.status <= 599) {
          throw new CompassCallError(
            `Server at ${compassUrl} encountered an internal error`,
            Error(
              `Server internal error: ${response.status} ${response.statusText}`
            )
          );
        }
        return response;
      })
      // Handle unexpected response formats
      .then((response) => {
        if (response.status !== 200) {
          throw new Error(
            `Failed to fetch dapp address from compass: ${response.statusText}`
          );
        }
        const contentType = response.headers.get('Content-Type');
        if (!contentType || contentType.indexOf('application/json') === -1) {
          throw new Error(
            'Failed to fetch dapp address from compass: response is not JSON'
          );
        }
        return response.json();
      })
      .then((data) => {
        if (!data || !data.address) {
          throw new Error(`No dapp address found in compass response`);
        }
        return data.address;
      })
  );
}