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Introducing springdoc-openapi-gradle-plugin

Gradle plugin for springdoc-openapi.

This plugin allows you to generate an OpenAPI 3 specification for a Spring Boot application from a Gradle build. Compatibility Notes

The plugin is built on Gradle version 7.0.

Dependencies

This plugin has a runtime dependency on the following plugins:

  1. Spring Boot Gradle plugin - org.springframework.boot
  2. Gradle process plugin - com.github.psxpaul.execfork

How To Use

Gradle Groovy DSL

plugins {
      id "org.springframework.boot" version "2.7.0"
      id "org.springdoc.openapi-gradle-plugin" version "1.4.0"
}

Gradle Kotlin DSL

plugins {
    id("org.springframework.boot") version "2.7.0"
    id("org.springdoc.openapi-gradle-plugin") version "1.4.0"
}

Note: For latest versions of the plugins please check the Gradle Plugins portal.

How the plugin works?

When you add this plugin and its runtime dependency plugins to your build file, the plugin creates the following tasks:

  1. forkedSpringBootRun

  2. generateOpenApiDocs

Running the task generateOpenApiDocs writes the OpenAPI spec into a openapi.json file in your project's build dir.

gradle clean generateOpenApiDocs

When you run the gradle task generateOpenApiDocs, it starts your spring boot application in the background using forkedSpringBootRun task. Once your application is up and running generateOpenApiDocs makes a rest call to your applications doc url to download and store the open api docs file as json.

Customization

The following customizations can be done on task generateOpenApiDocs using extension openApi as follows

openApi {
    apiDocsUrl.set("https://localhost:9000/api/docs")
    outputDir.set(file("$buildDir/docs"))
    outputFileName.set("swagger.json")
    waitTimeInSeconds.set(10)
    groupedApiMappings.set(["https://localhost:8080/v3/api-docs/groupA" to "swagger-groupA.json",
                            "https://localhost:8080/v3/api-docs/groupB" to "swagger-groupB.json"])
    customBootRun {
        args.set(["--spring.profiles.active=special"]) 
    }
}
Parameter Description Required Default
apiDocsUrl The URL from where the OpenAPI doc can be downloaded No http://localhost:8080/v3/api-docs
outputDir The output directory for the generated OpenAPI file No $buildDir - Your project's build dir
outputFileName The name of the output file with extension No openapi.json
waitTimeInSeconds Time to wait in seconds for your Spring Boot application to start, before we make calls to apiDocsUrl to download the OpenAPI doc No 30 seconds
groupedApiMappings A map of URLs (from where the OpenAPI docs can be downloaded) to output file names No []
customBootRun Any bootRun property that you would normal need to start your spring boot application. No (N/A)

customBootRun properties examples

customBootRun allows you to send in the properties that might be necessary to allow for the forked spring boot application that gets started to be able to start (profiles, other custom properties, etc.) customBootRun allows you can specify bootRun style parameter, such as args, jvmArgs, systemProperties and workingDir. If you don't specify customBootRun parameter, this plugin uses the parameter specified to bootRun in Spring Boot Gradle Plugin.

Passing static args

This allows for you to be able to just send the static properties when executing Spring application in generateOpenApiDocs.

openApi {
    customBootRun {
        args = ["--spring.profiles.active=special"] 
    }
}

Passing straight from gradle

This allows for you to be able to just send in whatever you need when you generate docs.

./gradlew clean generateOpenApiDocs -Dspring.profiles.active=special

and as long as the config looks as follows that value will be passed into the forked spring boot application.

openApi {
    customBootRun {
         systemProperties = System.properties
    }
}

Grouped API Mappings Notes

The groupedApiMappings customization allows you to specify multiple URLs/file names for use within this plugin. This configures the plugin to ignore the apiDocsUrl and outputFileName parameters and only use those found in groupedApiMappings. The plugin will then attempt to download each OpenAPI doc in turn as it would for a single OpenAPI doc.

Building the plugin

  1. Clone the repo git@github.com:springdoc/springdoc-openapi-gradle-plugin.git
  2. Build and publish the plugin into your local maven repository by running the following
    ./gradlew clean pTML
    

Testing the plugin

  1. Create a new spring boot application or use an existing spring boot app and follow the How To Use section above to configure this plugin.

  2. Update the version for the plugin to match the current version found in build.gradle.kts

    id("org.springdoc.openapi-gradle-plugin") version "1.4.0"
    
  3. Add the following to the spring boot apps settings.gradle

    pluginManagement {
        repositories {
            mavenLocal()
            gradlePluginPortal()
        }
    }
    

Thank you for the support

  • Thanks a lot JetBrains for supporting springdoc-openapi project.

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