prance 0.5.0

Swagger/OpenAPI 2.0 Parser

Prance provides parsers for Swagger/OpenAPI 2.0 API specifications in Python. It uses swagger_spec_validator to validate specifications, but additionally resolves JSON references in accordance with the Swagger spec.

Mostly the latter involves handling non-URI references; Swagger is fine with providing relative file paths, whereas JSON references require URIs at this point in time.

Usage

Command Line Interface

After installing prance, a CLI is available for validating (and resolving external references in) specs:

# Validates with resolving
$ prance validate path/to/swagger.yml

# Validates without resolving
$ prance validate --no-resolve path/to/swagger.yml

# Validates and resolves, and writes the results to output.yaml
$ prance validate -o output.yaml path/to/swagger.yml

# Fetch URL, validate and resolve.
$ prance validate http://petstore.swagger.io/v2/swagger.json
Processing "http://petstore.swagger.io/v2/swagger.json"...
 -> Resolving external references.
Validates OK as Swagger/OpenAPI 2.0!

Code

Most likely you have spec file and want to parse it:

from prance import ResolvingParser
parser = ResolvingParser('path/to/my/swagger.yaml')
parser.specification  # contains fully resolved specs as a dict

Prance also includes a non-resolving parser that does not follow JSON references, in case you prefer that.

from prance import BaseParser
parser = BaseParser('path/to/my/swagger.yaml')
parser.specification  # contains specs as a dict still containing JSON references

URLs can also be parsed:

parser = ResolvingParser('http://petstore.swagger.io/v2/swagger.json')

Largely, that’s it. There is a whole slew of utility code that you may or may not find useful, too. Look at the full documentation for details.

Setup

Use virtualenv to create a virtual environment and change to it or not, as you see fit.

Then install the requirements:

$ pip install -r requirements.txt

Documentation

After setup, run the following to generate documentation:

$ python setup.py build_sphinx

Development

Test Execution

Run the whole test suite:

$ python setup.py test

Run a single test scenario:

$ pytest tests/test_resolving_parser.py::test_basics

Run tests on multiple Python versions:

$ tox

Run tests on Python 2.7:

$ tox -e py27

A simple test coverage report is automatically generated.

License

Licensed under MITNFA (MIT +no-false-attribs) License. See the LICENSE.txt file for details.