How to add custom additional fields - BlockcertValidationError

Support
1

Hello,

I’m trying to create certificates containing custom additional fields. My cert-tools conf.ini contains the following line:
additional_global_fields = {"fields": [{"path": "$.badge.xyz_custom_field","value": "this going to contain some data"}]}

When trying to execute the cert-issuer I get the following error:
cert_schema.schema_tools.schema_validator.BlockcertValidationError: There are some fields in the certificate that do not correspond to the expected schema. This has likely been tampered with. Unmapped fields are: <http://fallback.org/xyz_custom_field>

How can I add a custom additional field both as additional_global_fields and as additional_per_recipient_fields in the cert-tools conf.ini?

I probably have to add a @context because of the canonicalization of the JSON-LD certificate. But how can I do this and do I have to do something else?

Thanks in advance!

Kind regards,
uzu

1 Like
2

Hi Uzu,
Yes, that’s exactly right. Each of your new terms has to be defined in a JSON-LD context. You can either point to an existing JSON-LD context, or embed them directly in the context of the certificate. For an example of the latter, see the JSON-LD specification section 3.1. In this case, the @context value would be an array listing the existing context links, and your new definition. Roughly like this:

{
  "@context": [
        "https://w3id.org/openbadges/v2",
        "https://w3id.org/blockcerts/v2",
        {
             "xyz_custom_field": "http://path/to/xyz_custom_field",
              ... // and all other custom fields
        }
    ]
}

This is a doc oversight, so I’m going to create an issue to fix this.

1 Like
3

Hi Kim and Uzu,

Can you guys help me understand how to add a custom field in the CSV roster file.I.e. instead of just ‘name’,‘pubkey’,‘identity’ in the file ‘roster_testnet.csv’, I want to add ‘additional1’. I am a little confused by the above.

  • What does it mean by JSON path?

  • Do I still need to add a JSON-LD file for custom recipient fields? If so can this be done as a local file?

  • What is path in the below for, is it to the csv file or the JSON-LD?

additional_per_recipient_fields = {“fields”: [{“path”: “$.xyz_additional”,“value”: “|EVIDENCE|”,“csv_column”: “additional1”}]}

  • Do any other fields have to be filled out e.g. ‘value’ or ‘evidence’?

Thanks.

1 Like
4

Hi @jake666 & @uzu;

Did you succeed to create custom field? Could you create an additional field for cert which is verifiable? If you did, could you share steps and structure?

Thanks.

5

Is this solved? We would like to add a custom field to the CSV file

6

Do you have any examples on how to inser the name of the recipient in the displayHTML field? Thank you!

7

Is it any document available to add additional fields? I tried to add additional fields but after adding additional field and create template, template created but got following while verify the json. Where(json path) I need to add my additonal field in the json. How to configure additional fiels on conf.ini file properly?

0|Blockcer | File “/usr/local/lib/python3.6/dist-packages/cert_core-2.1.9-py3.6.egg/cert_core/cert_model/model.py”, line 382, in to_certificate_model

0|Blockcer | raise InvalidCertificateError(‘V1.1 Blockchain Certificates require a transaction id and raw bytes’)

0|Blockcer | cert_core.InvalidCertificateError: V1.1 Blockchain Certificates require a transaction id and raw bytes

0|Blockcer | /usr/local/lib/python3.6/dist-packages/merkletools-1.0.2-py3.6.egg/merkletools/init.py:7: UserWarning: sha3 is not working!

0|Blockcer | warn(“sha3 is not working!”)

0|Blockcer | Traceback (most recent call last):

0|Blockcer | File “/home/ubuntu/cert-verifier/cert_verifier/verifier.py”, line 59, in

0|Blockcer | result = verify_certificate_file(cert_file)

0|Blockcer | File “/home/ubuntu/cert-verifier/cert_verifier/verifier.py”, line 50, in verify_certificate_file

0|Blockcer | certificate_bytes=certificate_bytes)

0|Blockcer | File “/usr/local/lib/python3.6/dist-packages/cert_core-2.1.9-py3.6.egg/cert_core/cert_model/model.py”, line 382, in to_certificate_model

0|Blockcer | raise InvalidCertificateError(‘V1.1 Blockchain Certificates require a transaction id and raw bytes’)

0|Blockcer | cert_core.InvalidCertificateError: V1.1 Blockchain Certificates require a transaction id and raw bytes

0|Blockcer | /bin/sh: 1: /home/ubuntu/blockcerts.sh: not found

0|Blockcer | /bin/sh: 1: /home/ubuntu/blockcerts.sh: not found

8
9

@lemoustachiste

Can you provide us one example adding custom fields along with the JSON-LD Context.

I have added the custom field as shown here.

But i couldn’t understand how to write the JSON-LD context.

FHIR JSON-LD Playground is no more a valid URL.

Thanks.

10

I tested the fhir link and it seems to be working.
You can also use this link: JSON-LD Playground.

I am usually searching with my favorite search engine for “jsonld playground” if they are both unavailable.