Add TrustStore Support for Fetching OpenAPI via HTTPS with Self-Signed Certificates

README.md

@@ -25,8 +25,8 @@ Gradle Groovy DSL
 
 ```groovy
 plugins {
-      id "org.springframework.boot" version "2.7.0"
-      id "org.springdoc.openapi-gradle-plugin" version "1.8.0"
+    id "org.springframework.boot" version "2.7.0"
+    id "org.springdoc.openapi-gradle-plugin" version "1.8.0"
 }
 ```
 
@@ -73,24 +73,30 @@ openApi as follows
 
 ```kotlin
 openApi {
-    apiDocsUrl.set("https://localhost:9000/api/docs")
-    outputDir.set(file("$buildDir/docs"))
-    outputFileName.set("swagger.json")
-    waitTimeInSeconds.set(10)
-    groupedApiMappings.set(["https://localhost:8080/v3/api-docs/groupA" to "swagger-groupA.json",
-                            "https://localhost:8080/v3/api-docs/groupB" to "swagger-groupB.json"])
-    customBootRun {
-        args.set(["--spring.profiles.active=special"]) 
-    }
+	apiDocsUrl.set("https://localhost:9000/api/docs")
+	outputDir.set(file("$buildDir/docs"))
+	outputFileName.set("swagger.json")
+	waitTimeInSeconds.set(10)
+	trustStore.set("keystore/truststore.p12")
+	trustStorePassword.set("changeit".toCharArray())
+	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. If the url ends with `.yaml`, output will YAML format.                                                                                 | No       | http://localhost:8080/v3/api-docs    |
+| `apiDocsUrl`         | The URL from where the OpenAPI doc can be downloaded. If the url ends with `.yaml`, output will YAML format.                        | No       | http://localhost:8080/v3/api-docs    |
 | `outputDir`          | The output directory for the generated OpenAPI file                                                                                 | No       | $buildDir - Your project's build dir |
-| `outputFileName`     | Specifies the output file name.                            | No       | openapi.json                         |
+| `outputFileName`     | Specifies the output file name.                                                                                                     | 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                           |
+| `trustStore`         | Path to a trust store that contains custom trusted certificates.                                                                    | No       | `<None>`                             |
+| `trustStorePassword` | Password to open Trust Store                                                                                                        | No       | `<None>`                             |
 | `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)                                |
 
@@ -134,6 +140,20 @@ openApi {
 }
 ```
 
+### Trust Store Configuration
+
+If you have restricted your application to HTTPS only and prefer not to include your certificate
+in Java's cacerts file, you can configure your own set of trusted certificates through plugin
+properties, ensuring SSL connections are established.
+
+#### Generating a Trust Store
+
+To create your own Trust Store, utilize the Java keytool command:
+
+```shell
+keytool -storepass changeit -noprompt -import -alias ca -file [CERT_PATH]/ca.crt -keystore [KEYSTORE_PATH]/truststore.p12 -deststoretype PKCS12
+```
+
 ### Grouped API Mappings Notes
 
 The `groupedApiMappings` customization allows you to specify multiple URLs/file names for

src/main/kotlin/org/springdoc/openapi/gradle/plugin/OpenApiExtension.kt

@@ -18,6 +18,9 @@ open class OpenApiExtension @Inject constructor(
 	val outputFileName: Property<String> = objects.property(String::class.java)
 	val outputDir: DirectoryProperty = objects.directoryProperty()
 	val waitTimeInSeconds: Property<Int> = objects.property(Int::class.java)
+	val trustStore: Property<String> = objects.property(String::class.java)
+	val trustStorePassword: Property<CharArray> = objects.property(CharArray::class.java)
+
 	val groupedApiMappings: MapProperty<String, String> =
 		objects.mapProperty(String::class.java, String::class.java)
 	val customBootRun: CustomBootRunAction =

src/main/kotlin/org/springdoc/openapi/gradle/plugin/OpenApiGeneratorTask.kt

@@ -17,13 +17,23 @@ import org.gradle.api.provider.MapProperty
 import org.gradle.api.provider.Property
 import org.gradle.api.tasks.Input
 import org.gradle.api.tasks.Internal
+import org.gradle.api.tasks.Optional
 import org.gradle.api.tasks.OutputDirectory
 import org.gradle.api.tasks.TaskAction
+import java.io.FileInputStream
 import java.net.ConnectException
 import java.net.HttpURLConnection
 import java.net.URL
+import java.security.KeyStore
+import java.security.SecureRandom
 import java.time.Duration
 import java.time.temporal.ChronoUnit.SECONDS
+import java.util.Locale
+import javax.net.ssl.HttpsURLConnection
+import javax.net.ssl.KeyManager
+import javax.net.ssl.SSLContext
+import javax.net.ssl.TrustManagerFactory
+
 
 private const val MAX_HTTP_STATUS_CODE = 299
 
@@ -40,9 +50,17 @@ open class OpenApiGeneratorTask : DefaultTask() {
 
 	@get:OutputDirectory
 	val outputDir: DirectoryProperty = project.objects.directoryProperty()
+
 	@get:Internal
-	val waitTimeInSeconds: Property<Int> =
-		project.objects.property(Int::class.java)
+	val waitTimeInSeconds: Property<Int> = project.objects.property(Int::class.java)
+
+	@get:Optional
+	@get:Input
+	val trustStore: Property<String> = project.objects.property(String::class.java)
+
+	@get:Optional
+	@get:Input
+	val trustStorePassword: Property<CharArray> = project.objects.property(CharArray::class.java)
 
 	init {
 		description = OPEN_API_TASK_DESCRIPTION
@@ -56,6 +74,8 @@ open class OpenApiGeneratorTask : DefaultTask() {
 		groupedApiMappings.convention(extension.groupedApiMappings)
 		outputDir.convention(extension.outputDir)
 		waitTimeInSeconds.convention(extension.waitTimeInSeconds)
+		trustStore.convention(extension.trustStore)
+		trustStorePassword.convention(extension.trustStorePassword)
 	}
 
 	@TaskAction
@@ -69,20 +89,23 @@ open class OpenApiGeneratorTask : DefaultTask() {
 
 	private fun generateApiDocs(url: String, fileName: String) {
 		try {
-			val isYaml = url.toLowerCase().matches(Regex(".+[./]yaml(/.+)*"))
+			val isYaml = url.lowercase(Locale.getDefault()).matches(Regex(".+[./]yaml(/.+)*"))
+			val sslContext = getCustomSslContext()
 			await ignoreException ConnectException::class withPollInterval Durations.ONE_SECOND atMost Duration.of(
 				waitTimeInSeconds.get().toLong(),
 				SECONDS
 			) until {
+				HttpsURLConnection.setDefaultSSLSocketFactory(sslContext.socketFactory)
 				val connection: HttpURLConnection =
 					URL(url).openConnection() as HttpURLConnection
 				connection.requestMethod = "GET"
 				connection.connect()
 				val statusCode = connection.responseCode
-				logger.trace("apiDocsUrl = {} status code = {}", url, statusCode)
+				logger.debug("apiDocsUrl = {} status code = {}", url, statusCode)
 				statusCode < MAX_HTTP_STATUS_CODE
 			}
 			logger.info("Generating OpenApi Docs..")
+			HttpsURLConnection.setDefaultSSLSocketFactory(sslContext.socketFactory)
 			val connection: HttpURLConnection =
 				URL(url).openConnection() as HttpURLConnection
 			connection.requestMethod = "GET"
@@ -103,6 +126,24 @@ open class OpenApiGeneratorTask : DefaultTask() {
 		}
 	}
 
+	private fun getCustomSslContext(): SSLContext {
+		if (trustStore.isPresent) {
+			logger.debug("Reading truststore: ${trustStore.get()}")
+			FileInputStream(trustStore.get()).use { truststoreFile ->
+				val trustManagerFactory = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm())
+				val truststore = KeyStore.getInstance(KeyStore.getDefaultType())
+				truststore.load(truststoreFile, trustStorePassword.get())
+				trustManagerFactory.init(truststore)
+				val sslContext: SSLContext = SSLContext.getInstance("TLSv1.2")
+				val keyManagers = arrayOf<KeyManager>()
+				sslContext.init(keyManagers, trustManagerFactory.trustManagers, SecureRandom())
+
+				return sslContext
+			}
+		}
+		return SSLContext.getDefault()
+	}
+
 	private fun prettifyJson(response: String): String {
 		val gson = GsonBuilder().setPrettyPrinting().create()
 		try {

src/test/kotlin/org/springdoc/openapi/gradle/plugin/OpenApiGradlePluginTest.kt

@@ -224,6 +224,27 @@ class OpenApiGradlePluginTest {
 		assertOpenApiJsonFile(1)
 	}
 
+	@Test
+	fun `using HTTPS api url to download api-docs`() {
+		val trustStore = File(projectTestDir, "truststore.p12")
+		buildFile.writeText(
+			"""$baseBuildGradle
+
+            openApi{
+				trustStore = "${trustStore.absolutePath}"
+				trustStorePassword = "changeit".toCharArray()
+                apiDocsUrl = "https://127.0.0.1:8081/v3/api-docs"
+                customBootRun {
+                    args = ["--spring.profiles.active=ssl"]
+                }
+            }
+        """.trimMargin()
+		)
+
+		assertEquals(TaskOutcome.SUCCESS, openApiDocsTask(runTheBuild()).outcome)
+		assertOpenApiJsonFile(1)
+	}
+
 	@Test
 	fun `yaml generation`() {
 		val outputYamlFileName = "openapi.yaml"

src/test/resources/acceptance-project/src/main/resources/application-ssl.properties

@@ -0,0 +1,6 @@
+server.port=8081
+server.ssl.key-alias=ssl
+server.ssl.key-password=+bAyoiVYOy6Tg/v2IG4blme2Hu+ORTksvFh/w9s=
+server.ssl.key-store=classpath:keystore.p12
+server.ssl.key-store-password=+bAyoiVYOy6Tg/v2IG4blme2Hu+ORTksvFh/w9s=
+server.ssl.key-store-type=PKCS12