oastodcat

A small Python library to transform an openAPI file to a dcat:DataService

At this moment we support all 3.0.x versions of The OpenAPI specification

Usage

Install

% pip install oastodcat

Getting started

Example usage:

import yaml
import requests
from datacatalogtordf import Catalog
from oastodcat import OASDataService

# Create catalog object
catalog = Catalog()
catalog.identifier = "http://example.com/catalogs/1"
catalog.title = {"en": "A dataset catalog"}
catalog.publisher = "https://example.com/publishers/1"

# Create a dataservice based on an openAPI-specification:
url = ("https://raw.githubusercontent.com/"
      "OAI/OpenAPI-Specification/master/examples/v3.0/petstore.yaml"
     )
oas = yaml.safe_load(requests.get(url).text)
identifier = "http://example.com/dataservices/{id}"
oas_spec = OASDataService(url, oas, identifier)
#
# Add dataservices to catalog:
for dataservice in oas_spec.dataservices:
  catalog.services.append(dataservice)

get dcat representation in turtle (default)
dcat = catalog.to_rdf()
# Get dcat representation in turtle (default)
dcat = catalog.to_rdf()
print(dcat)

Mapping

The following table shows how an openAPI specification is mapped to a dcat:DataService:
(Only dcat:DataService properties are shown.)

dcat:DataService	RDF property	openAPI v 3.0.x	Note
endpoint description	dcat:endpointDescription	url to description
endpoint URL	dcat:endpointURL	servers.url	[1]
serves dataset		n/a
access rights
conforms to	dct:conformsTo
contact point	dcat:contactPoint	info.contact
creator
description	dct:description	info.description
has policy
identifier		n/a
is referenced by
keyword/tag
landing page	dcat:landingPage	externalDocs
license	dct:license	info.license.url
resource language
relation
rights
qualified relation
publisher	dct:publisher
release date
theme/category
title	dct:title	info.title
type/genre
update/modification date
qualified attribution
media type	dcat:mediaType	<it's complicated>

[1] For each url in the servers object array, an instance of dcat:DataService will be created.

Development

Requirements

• python3
• pyenv (recommended)
• pipx (recommended)
• poetry
• nox
• nox-poetry

% pipx install poetry==1.0.5
% pipx install nox==2019.11.9
% pipx inject nox nox-poetry

Install dependencies

```Shell
% git clone https://github.com/Informasjonsforvaltning/oastodcat.git
% cd oastodcat
% pyenv install 3.8.6
% pyenv install 3.9.0
% pyenv install 3.10.4
% poetry install

Run all sessions

% nox

Run all tests with coverage reporting

% nox -rs tests

Debugging

You can enter into Pdb by passing --pdb to pytest:

nox -rs tests -- --pdb

You can set breakpoints directly in code by using the function breakpoint().