yaml-env-var-parser 1.1.1

Implementation of PyYAML Reader with environment variables parsing.

yaml_env_var_parser

Implementation of PyYAML Reader with env var parsing.

Inspired by envyaml: https://github.com/thesimj/envyaml

The Reader is the very first step of the PyYAML parsing process and this is where the environment variable is being parsed.

The environment variable parsing can be anywhere in the yaml file, the parsing is done in the very early stages of the PyYAML loading process. It is possible to inject a YAML structure using it

The code below is an example of what I mean be anywere:

import os
from yaml_env_var_parser import load

# env vars are replaced on keys
os.environ['MY_KEY'] = 'key'
# they might also be YAML tags
os.environ['TIMESTAMP_TAG'] = '!!timestamp'
# this will inject `another_key` into the yaml data
os.environ['MY_COMPLEX_DATA'] = """"simple_data"
another_key: "its possible to create new keys with env vars. we might call it YAML INJECTION"
"""
yaml_data_str = """
${MY_KEY}: "data"
complex_data: ${MY_COMPLEX_DATA}
timestamp_tag: ${TIMESTAMP_TAG} 2022-01-01 00:00:00
"""
parsed = load(yaml_data_str)
print(parsed)

Output:

{'key': 'data', 'complex_data': 'simple_data', 'another_key': 'its possible to create new keys with env vars. we might call it YAML INJECTION', 'timestamp_tag': datetime.datetime(2022, 1, 1, 0, 0)}

The key another_key does not exist in yaml_data_str yaml str definition but it is added from the environment variable ${MY_COMPLEX_DATA} MIT License

Copyright (c) 2022 NiltonDuarte

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.