import Provider from '@datasign/siop';
import {SIOPError, SIOPRequestValidationError, SIOPResponseGenerationError} from '@datasign/siop';
import {getResolver as getWebResolver} from 'web-did-resolver';

...
        // Assume we've received this url from RP.
        const siopRequest = 'https://example.com/deeplink?response_type=id_token&scope=openid%20did_authn&client_id=<...>&request_uri=<...>';
        try {
          const idTokenExpiresIn = 3600;
          const resolver = new Resolver({...getWebResolver()});
          // Instantiate Self-Issued OpenID Provider.
          const provider = new Provider(idTokenExpiresIn, resolver);
          // Parse and validate the SIOP request coming from RP.
          // You can also pass a parameter parsed by react-navigation.
          const {clientId, iss, kid} = await provider.receiveRequest(siopRequest);

          // Generate a SIOP response.
          // You can choose your personas based on the information returned above.
          let location = await provider.generateResponse(
            'did:example:persona1',
            keyPair,  // keyPair generated by the elliptic library
            // You can include additional fields into id token in the return value.
            {vp_uri: 'https://credentials.example.xyz/12345'}
          );
          // You can use `location` directly as a redirect url to RP.
          await Linking.openURL(location);
        } catch (error) {
          if (error instanceof SIOPError) {
              if (error instanceof SIOPRequestValidationError) {
                  // `error` was throwed at `receiveRequest()` in this case.
                  console.error(error.error)
                  console.error(error.invalidField)
                  console.error(error.invalidValue)
              }
              else if (error instanceof SIOPResponseGenerationError) {
                  // `error` was throwed at `generateResponse()`.
                  console.error(error)
              }
              // Generate a redirect url to use as the error response to the RP.
              location = error.toResponse();
              await Linking.openURL(location);
          }
        }