login method

@override Future<void> login()

Method to login the client, it does attempt to parse out any of the above values that may be passed from the server

Implementation

@override
Future<void> login() async {
  if (!(await isLoggedIn())) {
    /// if no authorizeUrl or tokenUrl, go find them
    if (authorizeUrl == null || tokenUrl == null) {
      final capabilityStatement = await _getCapabilityStatement();
      authorizeUrl = _getUri(capabilityStatement, 'authorize');
      tokenUrl = _getUri(capabilityStatement, 'token');
    }

    /// Create a new code grant (had to extend it, because FHIR uses
    /// non-standard parameters)
    final grant = SmartAuthorizationCodeGrant(
      clientId!,
      authorizeUrl!.value!,
      tokenUrl!.value!,
      secret: secret,
    );

    /// Get the authorizationUrl
    var authorizationUrl = grant.getAuthorizationUrl(
      redirectUri!.value!,
      scopes: scopes,
    );

    /// Create a map from the parameters
    final params = Map.of(authorizationUrl.queryParameters);

    /// Add the aud in
    params['aud'] = '$fhirUri';

    if (launch != null && !fhirUri.toString().contains('cerner')) {
      params['launch'] = launch!;
    }

    /// Replace those params as part of the authorizationUrl
    authorizationUrl = authorizationUrl.replace(queryParameters: params);

    try {
      /// Attempt to authenticate
      final returnValue = await authClient.authenticate(
        authorizationUrl: authorizationUrl,
        redirectUri: redirectUri!,
      );

      /// Use the returnValue's parameters to handle Authorization
      /// NOTE: as part of the authorization, we will also get other fhir
      /// parameters that may be passed that are not officially part of an
      /// oauth2 workflow
      client = await grant.handleAuthorizationResponse(
          Uri.parse(returnValue).queryParameters);

      /// assign context values if available
      patientId = grant.fhirParameters['patient'];
      encounterId = grant.fhirParameters['encounter'];
      needPatientBanner = grant.fhirParameters['need_patient_banner'] == null
          ? null
          : grant.fhirParameters['need_patient_banner'].toString() == 'true'
              ? true
              : grant.fhirParameters['need_patient_banner'].toString() ==
                      'false'
                  ? false
                  : null;
      smartStyleUrl = grant.fhirParameters['smart_style_url'];
      fhirContext = grant.fhirParameters['fhirContext'];
      intent = grant.fhirParameters['intent'];
      tenant = grant.fhirParameters['tenant'];
      fhirUser = grant.fhirParameters['fhirUser'];
      displayName = grant.fhirParameters['displayName'];
      email = grant.fhirParameters['email'];
      profile = grant.fhirParameters['profile'];
    } catch (e, stack) {
      log('Exception: $e');
      log('Stack: $stack');
    }
  }
}