OpenAPI Diff action

This Github Action runs openapitools/openapi-diff on two versions of an OpenAPI spec.

It provides feedback on whether the changes are one of:

• no_changes
• incompatible
• compatible

It also provides a Markdown file that contains a readable version of the diff produced by openapitools/openapi-diff.

Inputs

• Required service-name: Name of the (micro) service that owns/implements the OpenAPI spec. This is tacked onto the name of the HTML output file for easy consumption.
• Required new-openapi-spec: Path to the new version of the OpenAPI spec. Relative to ${{ github_workspace }} and usually repo checked out at ${{ github_head_ref }}
• Required current-openapi-spec: Path to the current version of the OpenAPI spec. Relative to ${{ github_workspace }} and usually repo checked out at ${{ github_base_ref }}

Outputs

• diff-state: One word summary of the diff and one of: no_changes, incompatible, compatible. Can be used to conditionally execute some flows based on the result of the diff.
• diff-md-result: The diff generated by openapitools/openapi-diff in a Markdown file. Created in ${{ github_workspace }} and the name is of the format $(service-name)-openapi-diff.md

Example usage

...
    steps:
      - name: Checkout head
        uses: actions/checkout@v2
        with:
          fetch-depth: 0
          path: head

      - name: Checkout base
        uses: actions/checkout@v2
        with:
          ref: ${{ github.base_ref }}
          path: base
          
      - name: OpenAPI diff run
        uses: nareshbaliga/openapi-diff-gh-action@master
        id: oad
        with:
          service-name: my-service-name
          new-openapi-spec: head/apis/my-service-name-api/v2/api.yaml
          current-openapi-spec: base/apis/my-service-name-api/v2/api.yaml

      - name: OpenAPI diff upload results
        uses: actions/upload-artifact@v2
        with:
          path: ./${{ steps.oad.outputs.diff-md-result }}
          name: ${{ steps.oad.outputs.diff-md-result }}

      - name: OpenAPI diff breaking changes check
        if: steps.oad.outputs.diff-state == 'incompatible'
        uses: actions/github-script@v5
        with:
          script: |
            core.setFailed('Breaking OpenAPI changes found!')
...