private static List <HttpHeader> CreateRequestHeaders <ApiRequestType>(
SoftwareStatementProfile softwareStatement,
ApiRequestType payment,
BankClientProfile client,
TokenEndpointResponse tokenEndpointResponse)
where ApiRequestType : class
{
JwtFactory jwtFactory = new JwtFactory();
string jwt = jwtFactory.CreateJwt(
profile: softwareStatement,
claims: payment,
useOpenBankingJwtHeaders: true);
string[] jwsComponents = jwt.Split('.');
string jwsSig = $"{jwsComponents[0]}..{jwsComponents[2]}";
List <HttpHeader> headers = new List <HttpHeader>
{
new HttpHeader(name: "x-fapi-financial-id", value: client.XFapiFinancialId),
new HttpHeader(name: "Authorization", value: "Bearer " + tokenEndpointResponse.AccessToken),
new HttpHeader(name: "x-idempotency-key", value: Guid.NewGuid().ToString()),
new HttpHeader(name: "x-jws-signature", value: jwsSig)
};
return(headers);
}
private async Task <ApiResponseType> PostDomesticConsent <ApiRequestType, ApiResponseType>(
JwtFactory jwtFactory,
SoftwareStatementProfile softwareStatementProfile,
ApiRequestType consent,
ApiProfile apiProfile,
BankClientProfile bankClientProfile,
TokenEndpointResponse tokenEndpointResponse)
where ApiRequestType : class
where ApiResponseType : class
{
string jwt = jwtFactory.CreateJwt(
profile: softwareStatementProfile,
claims: consent,
useOpenBankingJwtHeaders: true);
string[] jwsComponents = jwt.Split('.');
string jwsSignature = $"{jwsComponents[0]}..{jwsComponents[2]}";
UriBuilder ub = new UriBuilder(new Uri(apiProfile.BaseUrl + "/domestic-payment-consents"));
string payloadJson = JsonConvert.SerializeObject(consent);
List <HttpHeader> headers = new List <HttpHeader>
{
new HttpHeader(name: "x-fapi-financial-id", value: bankClientProfile.XFapiFinancialId),
new HttpHeader(name: "Authorization", value: "Bearer " + tokenEndpointResponse.AccessToken),
new HttpHeader(name: "x-idempotency-key", value: Guid.NewGuid().ToString()),
new HttpHeader(name: "x-jws-signature", value: jwsSignature)
};
return(await new HttpRequestBuilder()
.SetMethod(HttpMethod.Post)
.SetUri(ub.Uri)
.SetHeaders(headers)
.SetContentType("application/json")
.SetContent(payloadJson)
.Create()
.RequestJsonAsync <ApiResponseType>(client: _apiClient, requestContentIsJson: true));
}
public async Task <BankClientProfileResponse> CreateAsync(BankClientProfilePublic bankClientProfile)
{
bankClientProfile.ArgNotNull(nameof(bankClientProfile));
// Load relevant objects
SoftwareStatementProfile softwareStatementProfile =
_softwareStatementProfileService.GetSoftwareStatementProfile(
bankClientProfile.SoftwareStatementProfileId);
// STEP 1
// Compute claims associated with Open Banking client
// Get OpenID Connect configuration info
OpenIdConfiguration openIdConfiguration =
await GetOpenIdConfigurationAsync(bankClientProfile.IssuerUrl);
new OpenBankingOpenIdConfigurationResponseValidator().Validate(openIdConfiguration)
.RaiseErrorOnValidationError();
// Create claims for client reg
OpenBankingClientRegistrationClaims registrationClaims = Factories.CreateRegistrationClaims(
issuerUrl: bankClientProfile.IssuerUrl,
sProfile: softwareStatementProfile,
concatScopes: false);
BankClientRegistrationClaimsOverrides registrationClaimsOverrides =
bankClientProfile.BankClientRegistrationClaimsOverrides;
if (!(registrationClaimsOverrides is null))
{
if (!(registrationClaimsOverrides.RequestAudience is null))
{
registrationClaims.Aud = registrationClaimsOverrides.RequestAudience;
}
}
BankClientRegistrationClaims persistentRegistrationClaims =
_mapper.Map <BankClientRegistrationClaims>(registrationClaims);
// STEP 2
// Check for existing Open Banking client for issuer URL
// If we have an Open Banking client with the same issuer URL we will check if the claims match.
// If they do, we will re-use this client.
// Otherwise we will return an error as only support a single client per issuer URL at present.
IQueryable <BankClientProfile> clientList = await _bankClientProfileRepo
.GetAsync(c => c.IssuerUrl == bankClientProfile.IssuerUrl);
BankClientProfile existingClient = clientList
.SingleOrDefault();
if (existingClient is object)
{
if (existingClient.BankClientRegistrationClaims != persistentRegistrationClaims)
{
throw new Exception(
"There is already a client for this issuer URL but it cannot be re-used because claims are different.");
}
}
// STEP 3
// Create new Open Banking client by posting JWT
BankClientProfile client;
if (existingClient is null)
{
JwtFactory jwtFactory = new JwtFactory();
string jwt = jwtFactory.CreateJwt(
profile: softwareStatementProfile,
claims: registrationClaims,
useOpenBankingJwtHeaders: false);
OpenBankingClientRegistrationResponse registrationResponse = await new HttpRequestBuilder()
.SetMethod(HttpMethod.Post)
.SetUri(openIdConfiguration.RegistrationEndpoint)
.SetContent(jwt)
.SetContentType("application/jwt")
.Create()
.RequestJsonAsync <OpenBankingClientRegistrationResponse>(
client: _apiClient,
requestContentIsJson: false);
BankClientRegistrationData openBankingClientResponse = new BankClientRegistrationData
{
ClientId = registrationResponse.ClientId,
ClientIdIssuedAt = registrationResponse.ClientIdIssuedAt,
ClientSecret = registrationResponse.ClientSecret,
ClientSecretExpiresAt = registrationResponse.ClientSecretExpiresAt
};
// Create and store Open Banking client
BankClientProfile newClient = _mapper.Map <BankClientProfile>(bankClientProfile);
client = await PersistOpenBankingClient(
value : newClient,
openIdConfiguration : openIdConfiguration,
registrationClaims : registrationClaims,
openBankingRegistrationData : openBankingClientResponse);
await _dbMultiEntityMethods.SaveChangesAsync();
}
else
{
client = existingClient;
}
// Return
return(new BankClientProfileResponse(client));
}
public async Task <PaymentConsentResponse> CreateAsync(DomesticPaymentConsent consent)
{
consent.ArgNotNull(nameof(consent));
// Load relevant objects
ApiProfile apiProfile = await _apiProfileRepo.GetAsync(consent.ApiProfileId)
?? throw new KeyNotFoundException("The API Profile does not exist.");
BankClientProfile bankClientProfile = await _bankClientProfileRepo.GetAsync(apiProfile.BankClientProfileId)
?? throw new KeyNotFoundException(
"The Bank Client Profile does not exist.");
SoftwareStatementProfile softwareStatementProfile =
_softwareStatementProfileService.GetSoftwareStatementProfile(
bankClientProfile.SoftwareStatementProfileId);
// Get client credentials grant (we will not cache token for now but simply use to POST consent)
TokenEndpointResponse tokenEndpointResponse =
await PostClientCredentialsGrant(scope : "payments", client : bankClientProfile);
// TODO: validate the response???
// Create new Open Banking consent by posting JWT
JwtFactory jwtFactory = new JwtFactory();
OBWriteDomesticConsentResponse4 consentResponse;
switch (apiProfile.ApiVersion)
{
case ApiVersion.V3P1P1:
OBWriteDomesticConsent2 newDomesticConsent =
_mapper.Map <OBWriteDomesticConsent2>(consent.DomesticConsent);
OBWriteDomesticConsentResponse2 rawConsentResponse = await
PostDomesticConsent <OBWriteDomesticConsent2, OBWriteDomesticConsentResponse2>(
jwtFactory : jwtFactory,
softwareStatementProfile : softwareStatementProfile,
consent : newDomesticConsent,
apiProfile : apiProfile,
bankClientProfile : bankClientProfile,
tokenEndpointResponse : tokenEndpointResponse);
consentResponse = _mapper.Map <OBWriteDomesticConsentResponse4>(rawConsentResponse);
break;
case ApiVersion.V3P1P2:
throw new ArgumentOutOfRangeException();
case ApiVersion.V3P1P4:
consentResponse = await
PostDomesticConsent <OBWriteDomesticConsent4, OBWriteDomesticConsentResponse4>(
jwtFactory : jwtFactory,
softwareStatementProfile : softwareStatementProfile,
consent : consent.DomesticConsent,
apiProfile : apiProfile,
bankClientProfile : bankClientProfile,
tokenEndpointResponse : tokenEndpointResponse);
break;
default:
throw new ArgumentOutOfRangeException();
}
// Generate URL for user auth
string consentId = consentResponse.Data.ConsentId;
string redirectUrl = softwareStatementProfile.DefaultFragmentRedirectUrl;
if (redirectUrl == "")
{
redirectUrl = bankClientProfile.BankClientRegistrationClaims.RedirectUris[0];
}
OAuth2RequestObjectClaims oAuth2RequestObjectClaims = Factories.CreateOAuth2RequestObjectClaims(
openBankingClient: bankClientProfile,
redirectUrl: redirectUrl,
scope: new[] { "openid", "payments" },
intentId: consentId);
string requestObjectJwt = jwtFactory.CreateJwt(
profile: softwareStatementProfile,
claims: oAuth2RequestObjectClaims,
useOpenBankingJwtHeaders: false);
Dictionary <string, string> keyValuePairs = new Dictionary <string, string>
{
{ "response_type", oAuth2RequestObjectClaims.ResponseType },
{ "client_id", oAuth2RequestObjectClaims.ClientId },
{ "redirect_uri", oAuth2RequestObjectClaims.RedirectUri },
{ "scope", oAuth2RequestObjectClaims.Scope },
{ "request", requestObjectJwt },
{ "nonce", oAuth2RequestObjectClaims.Nonce },
{ "state", oAuth2RequestObjectClaims.State }
};
string queryString = keyValuePairs.ToUrlEncoded();
string authUrl = bankClientProfile.OpenIdConfiguration.AuthorizationEndpoint + "?" + queryString;
// Create and store persistent object
string domesticConsentId = Guid.NewGuid().ToString();
DomesticConsent value = new DomesticConsent
{
State = oAuth2RequestObjectClaims.State,
SoftwareStatementProfileId = bankClientProfile.SoftwareStatementProfileId,
IssuerUrl = bankClientProfile.IssuerUrl,
ApiProfileId = apiProfile.Id,
ObWriteDomesticConsent = consent.DomesticConsent,
TokenEndpointResponse = null,
Id = domesticConsentId,
BankId = consentId
};
await _domesticConsentRepo.UpsertAsync(value);
await _dbMultiEntityMethods.SaveChangesAsync();
return(new PaymentConsentResponse
{
AuthUrl = authUrl,
ConsentId = domesticConsentId
});
}