dkist-header-validator 3.0.0

DKIST data validator

An interface containing a validator, and a spec translator for DKIST specs (specifically corresponding to SPEC122 RevE and SPEC214 RevA data):

• SPEC-0122: Data received from the summit

• SPEC-0214 l0: Data ingested and parsed by the Data Center

• SPEC-0214: Data published by the Data Center (incomplete)

The validator references a machine readable version of the DKIST Header Specifications which are defined here, in the dkist-fits-specifications. Unless otherwise specified, the latest version of dkist-fits-specifications package is installed along with the validator. Data can be validated against past revisions of the DKIST Header Specifications if a previous version of the dkist-fits-specifications package is installed. If you are receiving validation errors, please reference the version of the DKIST Header Specifications identified in the dkist-fits-specifications package to make sure that your headers are expected to be compliant with that version.

Features

• Uses voluptuous schemas to validate a given input header against dkist specifications

• 3 keyword validations: type validation, required-ness validation, and value validation

• Failure exceptions include a dictionary of validation failure causes

• SPEC-0122 to SPEC-0214 l0 translation

Installation

pip install dkist-header-validator

Usage

Currently, this package can be used to validate SPEC122 data or SPEC214 data. Please import the corresponding methods (spec122_validator and Spec122ValidationException, or spec214_validator and Spec214ValidationException, or spec214_l0_validator and Spec214ValidationException).

This package can be used for validating data, or for validating and translating data (SPEC122 input only).

Input data can be one of:

• string file path

• File like object

• HDUList object

• fits.header.Header object

• Dictionary of header keys and values

To validate data:

>>> from dkist_header_validator import spec122_validator, Spec122ValidationException

>>> spec122_validator.validate('dkist_rosa0181200000_observation.fits')

The cli can also be used to validate data:

>>> dkist-header-validator validate122 "path/to/file.fits"

>>> dkist-header-validator validate214 "path/to/file.fits"

To validate and translate data to spec214 l0:

>>> from dkist_header_validator import spec122_validator, Spec122ValidationException

>>> spec122_validator.validate_and_translate_to_214_l0('dkist_rosa0181200000_observation.fits')

Within the validate and validate_and_translate methods, a series of flags can be set, otherwise they will take their default values:

• extra: Default value is true (allow extra keys). This flag determines if extra keywords are allowed in the schema to be validated. Ingest validation should allow extra keys.

• return_type: Default value is HDUList. This flag will determine the return type. Can be one of dict, Path, BytesIO, fits.header.Header, HDUList.

Examples

1. Validate a file:

>>> from dkist_header_validator import spec122_validator, Spec122ValidationException
>>> spec122_validator.validate('dkist_rosa0181200000_observation.fits', return_type=dict)

>>> from pathlib import Path
>>> spec122_validator.validate('dkist_rosa0181200000_observation.fits', return_type=Path)

2. Validate and translate a file:

>>> from dkist_header_validator import spec122_validator, Spec122ValidationException
>>> spec122_validator.validate_and_translate_to_214_l0('dkist_rosa0181200000_observation.fits')

3. Validate headers:

>>> from dkist_header_validator import spec122_validator, Spec122ValidationException
>>> from astropy.io import fits
>>> hdus = fits.open('dkist_rosa0181200000_observation.fits')
>>> spec122_validator.validate(hdus[0].header, return_type=dict)

This project is Copyright (c) AURA/NSO.