Self-Description Factory

A Self Description document (SD-document) is provided for any participant of this data space. The Self Descriptions are stored inside the Self Description Hub. Self-Description Factory (SD-Factory) component is responsible for the creation of Self Descriptions. This component gets input data from the Onboarding Tool, which prepares the data for the SD-Factory, creates a Verifiable Credential and passes the document to the Managed Identity Wallet based on the Custodian for the signature. The result is sent to the Compliance Service for further processing.

Software Version

Software version: 2.1.13
Helm Chart version: 2.1.21

Solution Strategy

Here the flow of Self-Description creation is shown:

sequenceDiagram
	actor User
	User-->>Identity Provider: authentication
	User->>Onboarding Service: participant data
	Onboarding Service-->>Identity Provider: technical user
	Onboarding Service->>+SDFactory: SD-document 
    SDFactory-->>Identity Provider: technical user to access Compliance Service
    SDFactory->>+Compliance Service: Unsigned Verifiable Credential
    Compliance Service->>Compliance Service: asynchronous processing
    Compliance Service->>+Onboarding Service: Signed Verifiable Credential

Loading

1. A user is authenticated in Identity Provider service on behalf of a company and receives the authentication ticket.
2. User calls On-boarding Service with request for creating and publishing SD-document. The service authenticates the user and prepare the data SD-Factory needs for creating SD-document. SDFactory takes document in a format, specified in OpenAPI document Pre-22.4 schema, AKA 1.06 and convert it to Trust Framework V.22.10. Currently, these documents are supported by SD-Factory:
   • LegalParticipant;
   • ServiceOffering;
3. On-boarding service (OS) calls SD-Factory for creating SD-document passing this data as a parameter. OS uses a credential with a role allowing for this request (e.g. add_self_descriptions, the default role for SD-document creation). The credential for this operation is taken from Identity Provider (keycloak).
4. SD-Factory creates a Verifiable Credential based on the information taken from On-boarding Service
5. SD-Factory sends unsigned Verifiable Credential to the Compliance Service for further (asynchronous) processing. Compliance Service is responsible for verification of the VC and signing. In the end the Compliance Service sends Self-Description document back to the On-boarding service endpoint. OS is responsible for storing and publishing it.

For the VC we have to provide valid JSON context where we have a reference to an object from known ontology. This object carries the claims the SD-Factory signs. The document is published on the github repository of the project. The vocabulary URL can be changed when will be provided by Trusted Framework. Currently, we support a vocabulary for Version 22.10 of Trust Framework.

REST Interface

The SD-Factory provides interfaces to create Verifiable Credential for one of mentioned documents. Only the authorized user can call these interfaces. They are protected with keycloak. The configuration parameters are given in application.yml. The user role for creating Self-Descriptions is specified in application.yml as well.

To trigger creation of the SD-document one shall call the endpoint available by path :

POST /api/rel3/selfdescription

OpenAPI specification is given in Pre-22.4 schema, AKA 1.06.

An example of the body for LegalParticipant is given bellow:

{
  "type": "LegalParticipant",
  "holder": "BPNL000000000000",
  "issuer": "CAXSDUMMYCATENAZZ", 
  "externalId": "ID01234-123-4321",
  "registrationNumber": [
    {
      "type": "local",
      "value": "o12345678"
    }
  ],
  "headquarterAddress.country": "DE",
  "legalAddress.country": "DE",
  "bpn": "BPNL000000000000"
}

The Self-Description in the format of Verifiable Credential is created. Here is an example of Verifiable Credentials for LegalParticipant:

{
   "@context": [
      "https://www.w3.org/2018/credentials/v1",
      "https://f1c82785-5598-41c7-a083-01a8e1a80e19.mock.pstmn.io/ctxsd"
   ],
   "type": [
      "VerifiableCredential"
   ],
   "id": "5096f9c2-24fd-43c5-9d50-e43a409ebb33",
   "issuanceDate": "2023-07-26T17:07:31Z",
   "expirationDate": "2023-10-24T17:07:31Z",
   "credentialSubject": {
      "bpn": "BPNL000000000000",
      "registrationNumber": [
         {
            "type": "local",
            "value": "o12345678"
         }
      ],
      "headquarterAddress": {
         "countryCode": "DE"
      },
      "type": "LegalParticipant",
      "legalAddress": {
         "countryCode": "DE"
      }
   },
   "issuer": "CAXSDUMMYCATENAZZ"
}

Then the Verifiable Credential is sent to the Compliance Service.

Configuration

The configuration property file is located under resources folder and is incorporated into the fat jar during build process. It can be customized before building if needed. Or,the another one can be used as its location can be overridden:

java -jar myproject.jar --spring.config.location=file:./custom-config/

Here application.yml will be searched in custom-config dir.

Self-Description Factory Property file

An example of application.yml for SD-Factory is given bellow:

server:
  port: 8080
  error:
    include-message: always
keycloak:
  resource:
    clientid: <CLIENTID>
spring:
  jackson:
    default-property-inclusion: non_null
  profiles:
     active: catena-x-ctx
  security:
    oauth2:
      resourceserver:
        jwt:
        #jwk-set-uri: https://<example.com>/auth/realms/<REALM>/protocol/openid-connect/certs
springdoc:
  api-docs:
    enabled: true
  swagger-ui:
    url: /SDFactoryApi-vRel3.yml
app:
  build:
    version: ^project.version^
  verifiableCredentials:
    durationDays: 90
    schema2210Url: <SCHEMA2210URL>
  usersDetails:
    clearingHouse:
    #uri: https://<example.com>/api/credentials
    #serverUrl: https://<example.com>/auth
    #realm: <REALM>
    #clientId: <CLIENTID>
    #clientSecret:
  security:
    createRole: add_self_descriptions

Here keycloak section defines keycloak's parameters for client requests authentication.

Section spring.profiles activates different modes. From functional point of view, the Factory acts as a converter, transforming an input message to the output JSON and passes it to the Compliance Service. The actual converter is selected by setting corresponding profile. Currently, two type of converters are supported. The old one is selected if profile 'catena-x-ctx' is selected. It was used from the the beginning and well tested. The second is activated when 'gaia-x-ctx' profile is chosen. This converter generates JSON which shall be compatible with Gaia-X requirements, however it needs to be aligned with other services/components.

app.verifiableCredentials.durationDays defines for how many days the VC is issued.

schema2210Url specify the JSON-LD vocabulary URL

app.custodianWallet contains parameters for accessing Custodian Wallet:

• uri is custodian Wallet url
• auth-server-url, realm, clientId, clientSecret are keycloak parameters for a user which calls the Custodian Wallet. This user shall have enough rights to create Verifiable Credentials and Verifiable Presentations. app.clearingHouse contains authentication parameters for calling the Compliance Service.

app.security sets a role a user must have for creating Self-Description.

Building

SD-Factory use Maven for building process. To build a service from sources one need to go to corresponding directory and trigger building process:

cd SDFactory
./mvnw clean install

Then fat jar file can be found in target folder as well as in local Maven repository. it can be run with this command:

java -jar target/sd-factory-2.0.0.jar

Please note the name of jar-file as it may differ if version is changed.

To build a Docker image one can use this command:

docker build .

A Docker image will be built and installed to the local repository.

Testing

SD-Factory can be fired up locally in Docker environment. Before that the image needs to be created. Do not forget to provide necessary configuration parameters in application.yml for keycloak and the Custodian Wallet.

If spring.profile is set to test then the Factory does not send self-description to the Compliance Service, instead it just prints it out along with service data like Compliance Service URL, authentication token (if any) and external ID.

Container images

This application provides container images for demonstration purposes. The base image used, to build this demo application image is eclipse-temurin:17-jdk-alpine

Notice for Docker image

Docker Notice for this application can be find below:

DOCKER_NOTICE.md

Installation Steps

INSTALL.md

API health check URL

We can check the health for SD Factory by using below URL:

• https://<example.com>/actuator/health

License

Distributed under the Apache 2.0 License. See LICENSE for more information.

Contact

For contacting regarding the project see CONTACT