Command line tools for designing certificate templates and instantiating a certificate batch
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cert-tools

Command line tools for designing certificate templates, instantiating a certificate batch, and import/export tasks

see example of certificate template and batch creation in sample_data

Install

  1. Ensure you have an python environment. Recommendations

  2. Git clone the repository and change to the directory

git clone https://github.com/blockchain-certificates/cert-tools.git && cd cert-tools
  1. Run the setup script
pip install .

Scripts

The cert-tools setup script installs 2 scripts, which are described below:

create_certificate_template.py

Run

create-certificate-template -c conf.ini

Configuration

The conf.ini fields are described below. Optional arguments are in brackets

create-certificate-template --help

usage: create_v2_certificate_template.py [-h] [-c MY_CONFIG]
                                         [--data_dir DATA_DIR]
                                         [--issuer_logo_file ISSUER_LOGO_FILE]
                                         [--cert_image_file CERT_IMAGE_FILE]
                                         [--issuer_url ISSUER_URL]
                                         [--issuer_certs_url ISSUER_CERTS_URL]
                                         --issuer_email ISSUER_EMAIL
                                         --issuer_name ISSUER_NAME
                                         --issuer_id ISSUER_ID [--issuer_key ISSUER_KEY]
                                         [--certificate_description CERTIFICATE_DESCRIPTION]
                                         --certificate_title CERTIFICATE_TITLE
                                         --criteria_narrative CRITERIA_NARRATIVE
                                         [--template_dir TEMPLATE_DIR]
                                         [--template_file_name TEMPLATE_FILE_NAME]
                                         [--hash_emails]
                                         [--revocation_list REVOCATION_LIST]
                                         [--issuer_public_key ISSUER_PUBLIC_KEY]
                                         --badge_id BADGE_ID
                                         [--issuer_signature_lines ISSUER_SIGNATURE_LINES]
                                         [--additional_global_fields ADDITIONAL_GLOBAL_FIELDS]
                                         [--additional_per_recipient_fields ADDITIONAL_PER_RECIPIENT_FIELDS]


Args that start with '--' (eg. --data_dir) can also be set in a config file (./cert-tools/conf.ini or specified via -c). Config file syntax allows: key=value, flag=true, stuff=[a,b,c] (for details, see syntax at https://goo.gl/R74nmi). If an arg is specified in more than one place, then commandline values override config file values which override defaults.


Argument details:
  -h, --help            show this help message and exit
  -c MY_CONFIG, --my-config MY_CONFIG
                        config file path (default: None)
  --data_dir DATA_DIR   where data files are located (default: None)
  --issuer_logo_file ISSUER_LOGO_FILE
                        issuer logo image file, png format (default: None)
  --cert_image_file CERT_IMAGE_FILE
                        issuer logo image file, png format (default: None)
  --issuer_url ISSUER_URL
                        issuer URL (default: None)
  --issuer_certs_url ISSUER_CERTS_URL
                        issuer certificates URL (default: None)
  --issuer_email ISSUER_EMAIL
                        issuer email (default: None)
  --issuer_name ISSUER_NAME
                        issuer name (default: None)
  --issuer_id ISSUER_ID
                        issuer profile (default: None)
  --issuer_key ISSUER_KEY
                        issuer issuing key (default: None)
  --certificate_description CERTIFICATE_DESCRIPTION
                        the display description of the certificate (default:
                        None)
  --certificate_title CERTIFICATE_TITLE
                        the title of the certificate (default: None)
  --criteria_narrative CRITERIA_NARRATIVE
                        criteria narrative (default: None)
  --template_dir TEMPLATE_DIR
                        the template output directory (default: None)
  --template_file_name TEMPLATE_FILE_NAME
                        the template file name (default: None)
  --hash_emails         whether to hash emails in the certificate (default:
                        False)
  --revocation_list REVOCATION_LIST
                        issuer revocation list (default: None)
  --issuer_public_key ISSUER_PUBLIC_KEY
                        issuer public key (default: None)
  --badge_id BADGE_ID   badge id (default: None)
  --issuer_signature_lines ISSUER_SIGNATURE_LINES
                        issuer signature lines (default: None)
  --additional_global_fields ADDITIONAL_GLOBAL_FIELDS
                        additional global fields (default: None)
  --additional_per_recipient_fields ADDITIONAL_PER_RECIPIENT_FIELDS
                        additional per-recipient fields (default: None)


About

Creates a certificate template populated with the setting you provide in the conf.ini file. This will not contain recipient-specific data; such fields will be populated with merge tags.

instantiate_certificate_batch.py

Run

instantiate-certificate-batch -c conf.ini

About

Populates the certificate template (created by the previous script) with recipient data from a csv file. It generates a certificate per recipient based on the values in the csv file.

The csv file location is configurable via the conf.ini file.

The csv file must always contain:

  • name
  • pubkey
  • identity

Configuration

The conf.ini fields are described below. Optional arguments are in brackets

instantiate-certificate-batch --help

usage: instantiate_v2_certificate_batch.py [-h] [-c MY_CONFIG]
                                           [--data_dir DATA_DIR]
                                           [--issuer_certs_url ISSUER_CERTS_URL]
                                           [--template_dir TEMPLATE_DIR]
                                           [--template_file_name TEMPLATE_FILE_NAME]
                                           [--hash_emails]
                                           [--additional_per_recipient_fields ADDITIONAL_PER_RECIPIENT_FIELDS]
                                           [--unsigned_certificates_dir UNSIGNED_CERTIFICATES_DIR]
                                           [--roster ROSTER]

Args that start with '--' (eg. --data_dir) can also be set in a config file (./cert-tools/conf.ini or specified via -c). Config file syntax allows: key=value, flag=true, stuff=[a,b,c] (for details, see syntax at https://goo.gl/R74nmi). If an arg is specified in more than one place, then commandline values override config file values which override defaults.

Argument details:
  -h, --help            show this help message and exit
  -c MY_CONFIG, --my-config MY_CONFIG
                        config file path (default: None)
  --data_dir DATA_DIR   where data files are located (default: None)
  --issuer_certs_url ISSUER_CERTS_URL
                        issuer certificates URL (default: None)
  --template_dir TEMPLATE_DIR
                        the template output directory (default: None)
  --template_file_name TEMPLATE_FILE_NAME
                        the template file name (default: None)
  --hash_emails         whether to hash emails in the certificate (default:
                        False)
  --additional_per_recipient_fields ADDITIONAL_PER_RECIPIENT_FIELDS
                        additional per-recipient fields (default: None)
  --unsigned_certificates_dir UNSIGNED_CERTIFICATES_DIR
                        output directory for unsigned certificates (default:
                        None)
  --roster ROSTER       roster file name (default: None)

Adding custom fields

You can specify additional global fields (fields that apply for every certificate in the batch) and additional per-recipient fields (fields that you will specify per-recipient).

Important: defining your custom fields in a JSON-LD context

When adding either global or per-recipient custom fields, you must define each of your new terms 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.

Examples of both options are below:

{
  "@context": [
        "https://w3id.org/openbadges/v2",
        "https://w3id.org/blockcerts/v2",
        "https://your-custom-context/v1",                                <-- option 1: point to custom JSON-LD context
        {                                                                <-- option 2: directly embed in certificate
             "xyz_custom_field": "http://path/to/xyz_custom_field",
              ... // and all other custom fields
        }
    ]
}

Custom global fields

You can specify custom global fields in the conf.ini file with the additional_global_fields entry

For each additional global field, you must indicate:

  • the jsonpath to the field
  • the global value to use

Example:

conf.ini:

additional_global_fields = {"fields": [{"path": "$.certificate.subtitle","value": "custom subtitle"}]}

or, expanded for readability:

    additional_global_fields = {
        "fields": 
            [
                {
                    "path": "$.certificate.subtitle",
                    "value": "custom subtitle"
                }
            ]
    }

Custom per-recipient fields

See above note on (current) manual step of defining custom JSON-LD context.

Per-recipient fields are specified in a combination of the conf.ini file, with the additional_per_recipient_fields entry, and the .csv file containing per-recipient data. Per-recipient fields are used in both template creation and certificate instantiaion. During the template creation process, we apply placeholder merge tags as values. This helps you preview your template before running instantiate_certificate_batch.py.

For each additional per-recipient field, you must indicate the following in the additional_per_recipient_fields config field:

  • the jsonpath to the field
  • the merge_tag placeholder to use
  • the csv column where the value (per recipient) can be found. This is used by instantiate_certificate_batch

Example:

conf.ini version:

    additional_per_recipient_fields = {"fields": [{"path": "$.xyz_custom_field","value": "*|THIS WILL CONTAIN XYZ CUSTOM VALUES|*","csv_column": "xyz_custom_field"}]}

above expanded for readability:

TODO

create_revocation_addresses.py (currently unused)

Run (optional)

create-revocation-addresses -k tpubD6NzV...H66KUZEBkf

About

Generates Bitcoin addresses using an HD extended public (or private) key to be used as the issuer's revocation addresses for the certificates. This would be useful only if the issuer requires to be able to revoke specific certificates later on. It creates a list of addresses that could then be easily merged with the roster file, e.g. using unix's paste command.

To create 20 revocation address for a testnet extended public key for the first batch of 2016 certificates run:

echo "revkey" > rev_addresses.txt

create-revocation-addresses -n 20 -p "2016/1" -k tpubD6NzV...H66KUZEBkf >> rev_addresses.txt

To merge to roster (in unix) run:

paste -d , roster.txt rev_addresses.txt > roster_with_rev.txt

Example

See sample_data for example configuration and output. conf-mainnet.ini was used to create a batch of 2 unsigned certificates on the Bitcoin blockchain.

The steps were:

  • Create the template
    • Update the config file to contain the correct data to populate the certificates
    • Place the needed images in images/ and point to them in the config file
    • Run create_certificate_template.py, which resulted in the certificate template /certificate_templates/test.json
  • Instantiate the batch
    • Add the recipient roster (in this case rosters/roster_testnet.csv) with the recipient's Bitcoin addresses.
    • Run 'instantiate_certificate_batch.py', which resulted in the files in unsigned_certificates

Then the unsigned certificates were copied to cert-issuer for signing and issuing on the blockchain.

Contact

Contact us at the Blockcerts community forum.