Resolve "[New Job] generate HTML API documentation from OpenAPI file"

# 📗 OpenAPI

## Description

Creates an interactive version of an API documentation (see [demo](https://petstore.swagger.io/){:target="_blank"})

with [Swagger UI](https://swagger.io/tools/swagger-ui/){:target="_blank"}. It uses a [OpenAPI specifications](https://swagger.io/specification/){:target="_blank"} 

(or [Swagger](https://swagger.io/docs/specification/2-0/basic-structure/){:target="_blank"}) file to be generated.

The version of SwaggerUI used is compatible with OpenAPI Specification 3.0 and 2.0 (fka Swagger). 

This job let you the possibility to change SwaggerUI version (see [versions](https://github.com/swagger-api/swagger-ui#compatibility){:target="_blank"}) to match with older specifications versions.

## How to use it

1. Have a [compatible](#description) API specification file you can use in the job

2. Add the corresponding URL to your `.gitlab-ci.yml` file (see [Getting

   started](/use-the-hub/)). Example:

    ```yaml

    include:

      - remote: 'https://jobs.r2devops.io/openapi.yml'

    ```

3. If you need to customize the job (stage, variables, ...) 👉 check the [jobs

   customization](/use-the-hub/#jobs-customization)

4. Well done, your job is ready to work ! 😀

## Job details

* Job name: `openapi`

* Docker image: [`alpine:3.12.1`](https://hub.docker.com/_/alpine/){:target="_blank"}

* Default stage: `build`

* When: `always`

### Variables

| Name | Description | Default |

| ---- | ----------- | ------- |

| `API_DEF_LOCATION` <img width=250/> | Path to your OpenAPI file in your repository <img width=400/> | `openapi.json` |

| `SWAGGER_OUTPUT` | Output directory path | `/documentation_build` |

| `SWAGGERUI_VERSION` | Version of SwaggerUI (see [versions](https://github.com/swagger-api/swagger-ui#compatibility){:target="_blank"}) | `v3.37.0` |

### Artifacts

Result of documentation build is [exposed

as](https://docs.gitlab.com/ee/ci/yaml/#artifactsexpose_as){:target="_blank"} `OpenAPI Build` in

merge requests.

!!! warning

    Exposition of artifact doesn't work currently because of [this issue from

    Gitlab](https://gitlab.com/gitlab-org/gitlab/-/issues/37129){:target="_blank"}. As soon as

    the issue will be fixed, exposed artifacts will be available in merge

    requests.

name: openapi

description: A ready-to-use job to build a web documentation from swagger/openAPI file (json/yml) using Swagger-ui

default_stage: build

icon: 📗

maintainer: Protocole

license: MIT

 No newline at end of file

stages:

  - build

openapi:

  image: alpine:3.12.1

  stage: build

  variables:

      API_DEF_LOCATION: "openapi.json"

      SWAGGER_OUTPUT: "/documentation_build"

      SWAGGERUI_VERSION: "v3.37.0"

  script:

      - apk add git 

      - git clone --depth 1 --branch ${SWAGGERUI_VERSION} https://github.com/swagger-api/swagger-ui.git ./swaggerui

      - mkdir ${CI_PROJECT_DIR}${SWAGGER_OUTPUT}

      - mv swaggerui/dist/* ${CI_PROJECT_DIR}${SWAGGER_OUTPUT}/

      - cp $API_DEF_LOCATION ${CI_PROJECT_DIR}${SWAGGER_OUTPUT}/

      - sed -i "s|https://petstore.swagger.io/v2/swagger.json|$(basename $API_DEF_LOCATION)|g" ${CI_PROJECT_DIR}${SWAGGER_OUTPUT}/index.html

  artifacts:

      when: always

      expose_as: "OpenAPI Build"

      paths:

          - ${CI_PROJECT_DIR}${SWAGGER_OUTPUT}

* Initial version

    * [ApiDoc](/jobs/build/apidoc/)

    * [Mkdocs](/jobs/build/mkdocs/)

    * [Doxygen](/jobs/build/doxygen/)

    * [PHPDocumentor](/jobs/build/phpdocumentor/)

    * [OpenAPI](/jobs/build/openapi/)

1. Choose a version in [version list](#versions)

3. Add the corresponding URL to your `.gitlab-ci.yml` file (see [Getting