The Auditor

A GitHub Action that audits changes made in a pull request, using a customizable configuration.

This is a composite GitHub Action which does a few things under the hood. It will be explained in this section

The Auditor looks at every single line of changes in a pull request and then audits each line based on a custom configuration which you provide to it. The config file contains a rule set of string and regex matches to look for violations on each line of the diff. If a violation is found, The Auditor will comment on the pull request with your custom violation message and a link to the line of code where the violation was found.

All the collective pieces that make up this composite Action are referred to as The Auditor

As mentioned earlier, The Auditor is a composite GitHub Action. This means that it is composed of multiple GitHub Actions that work together. In fact, the Actions that it is composed of, were designed specifcally for this purpose.

Below is a high level over view of how this composite Action works:

1. actions/checkout is called and checks out your entire repository
2. GrantBirki/git-diff-action is called and a diff in JSON format is generated for the pull request
3. GrantBirki/auditor-action-core is called and the JSON diff from the previous step is passed into the auditor-action-core Action
4. The auditor-action-core Action reads your auditor.yml config file and audits the diff for violations
5. If violations are found, the auditor-action-core Action will comment on the pull request with your custom violation message and a link to the line of code where the violation was found

The composite Action will either pass or fail based on the inputs you provide it. You can optionally disable the comment feature as well if necessary. Please see the Inputs section for more information.

It should be noted that this Action only works for pull requests. It will not work properly in any other Actions context

Below is a sample Actions workflow that uses The Auditor:

vX.X.X is the version of the Action you want to use. Please see the releases page for the latest version

name: the-auditor

# run on all pull requests
on:
  pull_request:

permissions:
  contents: read # needed to view the config file and the git diff
  pull-requests: write # needed to publish a comment on pull requests

jobs:
  the-auditor:
    runs-on: ubuntu-latest
    steps:
      - name: auditor-action
        uses: GrantBirki/[email protected]
        with:
          config: config/auditor.yml # path to your 'auditor.yml' config file in your repository

These are the inputs that the Action accepts in its workflow file:

Please note that most of the configuration for this action takes place in the auditor.yml file which is described below

The following is an example of an auditor.yml configuration file will all available options:

Below is a list of all the configuration options that are available:

# rules is an array of auditor 'rules' that will be used to detect violations
rules: # array of rules
  - name: <string> # the name of the rule
    type: <string-exact|string-case-insensitive|regex> # the type of rule
    pattern: <string> # the matching pattern to use
    message: <string> # the message to display if a match is found
    include_regex: # array of regex patterns for files to include in the rule (optional)
      - <string>
    exclude_regex: # array of regex patterns for files to exclude from the rule (optional)
      - <string>

# global configuration options
global_options:
  alert_level: <fail|warn> # whether to fail or warn on violations - default is 'fail'
  comment_on_pr: <boolean> # whether to comment on the PR with violation results - default is true
  exclude_auditor_config: <boolean> # exclude the auditor config file from the audit (this file) - default is true
  labels: # array of labels to apply to the PR if a violation is found - comment out to disable (optional)
    - <string>
    - <string> # (can have multiple labels)
    - <string> # ... (do as many as you want!)
  exclude_regex: # array of regex patterns to exclude files from the audit globally
   - <string> # the regex pattern to exclude
   - <string> # the regex pattern to exclude (can have multiple)
   - <string> # ... (do as many as you want!)

Below is a live example (truly just an example) of what your auditor.yml file might look like:

# rules is an array of auditor 'rules' that will be used to detect violations
rules:
  - name: "Root User Detected" # the name of the rule
    type: string-exact # an exact string match - case sensitive
    pattern: "user root" # the string to match on
    message: root user detected - this is not allowed, please try again # the message to display if a match is found
    include_regex: # a regex to match the file path against - if it matches, the rule will be applied
      - "^.*\\.txt$"
    exclude_regex: # a regex to match the file path against - if it matches, the rule will not be applied
      - "^.*\\.log$"

  - name: "Root User Detected - Case Insensitive"
    type: string-case-insensitive # a case insensitive string match
    pattern: "UseR rOoT"
    message: root user detected - nice try...

  - name: "Root User Detected - Regex"
    type: regex # a regular expression match (regex)
    pattern: "user\\s+root" # the regex pattern to use for matching (global matchl for the line contents)
    message: root user detected - gotcha with regex

  - name: "should not find anything"
    type: regex
    pattern: "p{100}"
    message: this should not match anything - if it did I broke

# global configuration options
global_options:
  alert_level: fail # whether to fail or warn the Actions workflow if a violation is found - default is fail
  comment_on_pr: true # whether to comment on the PR with the violations found - default is true
  # exclude_auditor_config: false # exclude the auditor config file from the audit (this file) - default is true
  labels: # the labels to apply to the PR if a violation is found - comment out to disable
    - alert
  exclude_regex: # list of regex patterns to exclude files from the audit globally
   - "\\.md$"

The order of operations is important if you are going to use include_regex or exclude_regex options. The order of operations is as follows:

1. global_options.exclude_regex is checked first. If any file path matches the provided regex, all violations will be ignored for that file
2. Individual rule exclude_regex patterns are checked next. If any regex pattern matches the file path, the rule will be ignored for that file
3. Individual rule include_regex patterns are checked next. If any regex pattern matches the file path, the rule will be applied to that file. If the include rule does not match, then the file is skipped

• If the global_options.exclude_regex option is not used, then it assumes all files are included for scanning globally and designates pattern matching to the individual rules
• If the individual rule's exclude_regex option is not used, then it assumes no files will be explicitly excluded for that rule
• If the individual rule's include_regex option is not used, then it assumes all files are included for scanning for that rule

Below is an example screenshot of what a violation comment might look like: