[Kotlin Server] Update Ktor to the next major version 3

docs/generators/kotlin-server.md

@@ -18,6 +18,7 @@ These options may be applied as additional-properties (cli) or configOptions (pl
 
 | Option | Description | Values | Default |
 | ------ | ----------- | ------ | ------- |
+|Whether Kotlin serialization should be used|Whether Kotlin serialization should be used| |true|
 |additionalModelTypeAnnotations|Additional annotations for model type(class level annotations). List separated by semicolon(;) or new line (Linux or Windows)| |null|
 |apiSuffix|suffix for api classes| |Api|
 |artifactId|Generated artifact id (name of jar).| |kotlin-server|

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/KotlinServerCodegen.java

@@ -51,6 +51,8 @@ public class KotlinServerCodegen extends AbstractKotlinCodegen implements BeanVa
     @Getter @Setter
     private Boolean compressionFeatureEnabled = true;
     @Getter @Setter
+    private Boolean kotlinSerializationEnabled = true;
+    @Getter @Setter
     private Boolean resourcesFeatureEnabled = true;
     @Getter @Setter
     private Boolean metricsFeatureEnabled = true;
@@ -136,6 +138,7 @@ public KotlinServerCodegen() {
         addSwitch(Constants.AUTOMATIC_HEAD_REQUESTS, Constants.AUTOMATIC_HEAD_REQUESTS_DESC, getAutoHeadFeatureEnabled());
         addSwitch(Constants.CONDITIONAL_HEADERS, Constants.CONDITIONAL_HEADERS_DESC, getConditionalHeadersFeatureEnabled());
         addSwitch(Constants.HSTS, Constants.HSTS_DESC, getHstsFeatureEnabled());
+        addSwitch(Constants.KOTLIN_SERIALIZATION, Constants.KOTLIN_SERIALIZATION, getKotlinSerializationEnabled());
         addSwitch(Constants.CORS, Constants.CORS_DESC, getCorsFeatureEnabled());
         addSwitch(Constants.COMPRESSION, Constants.COMPRESSION_DESC, getCompressionFeatureEnabled());
         addSwitch(Constants.RESOURCES, Constants.RESOURCES_DESC, getResourcesFeatureEnabled());
@@ -225,6 +228,11 @@ public void processOpts() {
             LOGGER.info("`library` option is empty. Default to {}", DEFAULT_LIBRARY);
         }
 
+        if (isKtor()) {
+            typeMapping.put("date-time", "kotlin.String");
+            typeMapping.put("DateTime", "kotlin.String");
+        }
+
         if (additionalProperties.containsKey(Constants.AUTOMATIC_HEAD_REQUESTS)) {
             setAutoHeadFeatureEnabled(convertPropertyToBooleanAndWriteBack(Constants.AUTOMATIC_HEAD_REQUESTS));
         } else {
@@ -287,6 +295,14 @@ public void processOpts() {
         supportingFiles.add(new SupportingFile("gradle.properties", "", "gradle.properties"));
 
         if (isKtor()) {
+            setKotlinSerializationEnabled(true);
+
+            if (additionalProperties.containsKey(Constants.KOTLIN_SERIALIZATION)) {
+                setKotlinSerializationEnabled(convertPropertyToBooleanAndWriteBack(Constants.KOTLIN_SERIALIZATION));
+            } else {
+                additionalProperties.put(Constants.KOTLIN_SERIALIZATION, getKotlinSerializationEnabled());
+            }
+
             supportingFiles.add(new SupportingFile("AppMain.kt.mustache", packageFolder, "AppMain.kt"));
             supportingFiles.add(new SupportingFile("Configuration.kt.mustache", packageFolder, "Configuration.kt"));
 
@@ -353,6 +369,7 @@ public static class Constants {
         public static final String USE_MUTINY_DESC = "Whether to use Mutiny (should not be used with useCoroutines). This option is currently supported only when using jaxrs-spec library.";
         public static final String OMIT_GRADLE_WRAPPER = "omitGradleWrapper";
         public static final String OMIT_GRADLE_WRAPPER_DESC = "Whether to omit Gradle wrapper for creating a sub project.";
+        public static final String KOTLIN_SERIALIZATION = "Whether Kotlin serialization should be used";
     }
 
     @Override

modules/openapi-generator/src/main/resources/kotlin-server/data_class.mustache

@@ -1,11 +1,13 @@
 {{#parcelizeModels}}
-import android.os.Parcelable
-import kotlinx.parcelize.Parcelize
-
+    import android.os.Parcelable
+    import kotlinx.parcelize.Parcelize
 {{/parcelizeModels}}
 {{#serializableModel}}
-import java.io.Serializable
+    import java.io.Serializable
 {{/serializableModel}}
+{{#kotlinSerialization}}
+    import kotlinx.serialization.Serializable
+{{/kotlinSerialization}}
 /**
  * {{{description}}}
 {{#vars}}
@@ -15,21 +17,19 @@ import java.io.Serializable
 {{#parcelizeModels}}
 @Parcelize
 {{/parcelizeModels}}
+{{#kotlinSerialization}}
+@Serializable
+{{/kotlinSerialization}}
 {{#hasVars}}data {{/hasVars}}class {{classname}}(
 {{#requiredVars}}
 {{>data_class_req_var}}{{^-last}},
 {{/-last}}{{/requiredVars}}{{#hasRequired}}{{#hasOptional}},
 {{/hasOptional}}{{/hasRequired}}{{#optionalVars}}{{>data_class_opt_var}}{{^-last}},
 {{/-last}}{{/optionalVars}}
-) {{^serializableModel}}{{#parcelizeModels}} : Parcelable{{/parcelizeModels}}{{/serializableModel}}{{^parcelizeModels}}{{#serializableModel}}: Serializable {{/serializableModel}}{{/parcelizeModels}}{{#parcelizeModels}}{{#serializableModel}} : Parcelable, Serializable {{/serializableModel}}{{/parcelizeModels}}
+){{^serializableModel}}{{#parcelizeModels}} : Parcelable{{/parcelizeModels}}{{/serializableModel}}{{^parcelizeModels}}{{#serializableModel}}: Serializable {{/serializableModel}}{{/parcelizeModels}}{{#parcelizeModels}}{{#serializableModel}} : Parcelable, Serializable {{/serializableModel}}{{/parcelizeModels}}
 {{#vendorExtensions.x-has-data-class-body}}
 {
 {{/vendorExtensions.x-has-data-class-body}}
-{{#serializableModel}}
-    companion object {
-        private const val serialVersionUID: Long = 123
-    }
-{{/serializableModel}}
 {{#hasEnums}}
     {{#vars}}
     {{#isEnum}}

modules/openapi-generator/src/main/resources/kotlin-server/libraries/ktor/ApiKeyAuth.kt.mustache

@@ -1,4 +1,4 @@
-package org.openapitools.server.infrastructure
+package {{packageName}}.infrastructure
 
 import io.ktor.http.auth.*
 import io.ktor.server.application.*

modules/openapi-generator/src/main/resources/kotlin-server/libraries/ktor/AppMain.kt.mustache

@@ -1,7 +1,6 @@
 package {{packageName}}
 
 import io.ktor.server.application.*
-import io.ktor.serialization.gson.*
 import io.ktor.http.*
 {{#featureResources}}
 import io.ktor.server.resources.*
@@ -30,24 +29,17 @@ import java.util.concurrent.TimeUnit
 {{/featureMetrics}}
 import io.ktor.server.routing.*
 {{#hasAuthMethods}}
+import io.ktor.serialization.kotlinx.json.json
 import com.typesafe.config.ConfigFactory
 import io.ktor.client.HttpClient
 import io.ktor.client.engine.apache.Apache
 import io.ktor.server.config.HoconApplicationConfig
 import io.ktor.server.auth.*
-import org.openapitools.server.infrastructure.*
+import {{packageName}}.infrastructure.*
 {{/hasAuthMethods}}
 {{#generateApis}}{{#apiInfo}}{{#apis}}import {{apiPackage}}.{{classname}}
 {{/apis}}{{/apiInfo}}{{/generateApis}}
 
-{{#hasAuthMethods}}
-internal val settings = HoconApplicationConfig(ConfigFactory.defaultApplication(HTTP::class.java.classLoader))
-
-object HTTP {
-    val client = HttpClient(Apache)
-}
-{{/hasAuthMethods}}
-
 fun Application.main() {
     install(DefaultHeaders)
     {{#featureMetrics}}
@@ -62,7 +54,7 @@ fun Application.main() {
     {{/featureMetrics}}
 {{#generateApis}}
     install(ContentNegotiation) {
-        register(ContentType.Application.Json, GsonConverter())
+        json()
     }
     {{#featureAutoHead}}
     install(AutoHeadResponse) // see https://ktor.io/docs/autoheadresponse.html
@@ -125,7 +117,7 @@ fun Application.main() {
     {{/authMethods}}
     }
     {{/hasAuthMethods}}
-    install(Routing) {
+    routing {
     {{#apiInfo}}
     {{#apis}}
     {{#operations}}
@@ -134,6 +126,5 @@ fun Application.main() {
     {{/apis}}
     {{/apiInfo}}
     }
-
 {{/generateApis}}
 }

modules/openapi-generator/src/main/resources/kotlin-server/libraries/ktor/Paths.kt.mustache

@@ -18,10 +18,10 @@ object Paths {
      {{#allParams}}* @param {{paramName}} {{description}} {{^required}}(optional{{#defaultValue}}, default to {{{.}}}{{/defaultValue}}){{/required}}
      {{/allParams}}*/
     {{#hasParams}}
-    @Serializable @Resource("{{{path}}}") class {{operationId}}({{#allParams}}val {{paramName}}: {{{dataType}}}{{^required}}? = null{{/required}}{{#required}}{{#isNullable}}?{{/isNullable}}{{/required}}{{^-last}}, {{/-last}}{{/allParams}})
+    @Resource("{{{path}}}") class {{operationId}}({{#pathParams}}val {{paramName}}: {{{dataType}}}{{^required}}? = null{{/required}}{{#required}}{{#isNullable}}?{{/isNullable}}{{/required}}{{^-last}}, {{/-last}}{{/pathParams}})
     {{/hasParams}}
     {{^hasParams}}
-    @Serializable @Resource("{{{path}}}") class {{operationId}}
+    @Resource("{{{path}}}") class {{operationId}}
     {{/hasParams}}
 
     {{/operation}}

modules/openapi-generator/src/main/resources/kotlin-server/libraries/ktor/_principal.mustache

@@ -1,10 +1,10 @@
 {{#authMethods}}
 {{#isBasicBasic}}
-val principal = call.authentication.principal<UserIdPrincipal>()!!
+val principal = call.authentication.principal<UserIdPrincipal>()
 {{/isBasicBasic}}{{^isBasicBasic}}{{#isApiKey}}
-val principal = call.authentication.principal<ApiPrincipal>()!!
+val principal = call.authentication.principal<ApiPrincipal>()
 {{/isApiKey}}{{^isApiKey}}{{#isOAuth}}
-val principal = call.authentication.principal<OAuthAccessTokenResponse>()!!
+val principal = call.authentication.principal<OAuthAccessTokenResponse>()
 {{/isOAuth}}{{^isOAuth}}
 val principal = null!!
 {{/isOAuth}}{{/isApiKey}}{{/isBasicBasic}}

modules/openapi-generator/src/main/resources/kotlin-server/libraries/ktor/_response.mustache

@@ -2,7 +2,7 @@ val exampleContentType = "{{{contentType}}}"
 val exampleContentString = """{{&example}}"""
 
 when (exampleContentType) {
-    "application/json" -> call.respond(gson.fromJson(exampleContentString, empty::class.java))
+    "application/json" -> call.respondText(exampleContentType, ContentType.Application.Json)
     "application/xml" -> call.respondText(exampleContentString, ContentType.Text.Xml)
     else -> call.respondText(exampleContentString)
 }

modules/openapi-generator/src/main/resources/kotlin-server/libraries/ktor/api.mustache

@@ -1,7 +1,6 @@
 {{>licenseInfo}}
 package {{apiPackage}}
 
-import com.google.gson.Gson
 import io.ktor.http.*
 import io.ktor.server.application.*
 import io.ktor.server.auth.*
@@ -23,7 +22,6 @@ import {{packageName}}.infrastructure.ApiPrincipal
 
 {{#operations}}
 fun Route.{{classname}}() {
-    val gson = Gson()
     val empty = mutableMapOf<String, Any?>()
 
 {{#operation}}

modules/openapi-generator/src/main/resources/kotlin-server/libraries/ktor/build.gradle.kts.mustache

@@ -7,7 +7,8 @@ version = "{{artifactVersion}}"
 
 plugins {
     kotlin("jvm") version "2.0.20"
-    id("io.ktor.plugin") version "2.3.12"
+    application
+    kotlin("plugin.serialization") version "2.0.20"
 }
 
 application {
@@ -22,6 +23,7 @@ repositories {
 }
 
 dependencies {
+    implementation(platform("io.ktor:ktor-bom:3.0.2"))
     implementation("ch.qos.logback:logback-classic:$logback_version")
 {{#hasAuthMethods}}
     implementation("com.typesafe:config:1.4.1")
@@ -35,7 +37,7 @@ dependencies {
 {{/featureAutoHead}}
     implementation("io.ktor:ktor-server-default-headers")
     implementation("io.ktor:ktor-server-content-negotiation")
-    implementation("io.ktor:ktor-serialization-gson")
+    implementation("io.ktor:ktor-serialization-kotlinx-json")
 {{#featureResources}}
     implementation("io.ktor:ktor-server-resources")
 {{/featureResources}}

modules/openapi-generator/src/main/resources/kotlin-server/libraries/ktor/gradle.properties

@@ -1,4 +1,4 @@
 kotlin.code.style=official
-ktor_version=2.3.12
+ktor_version=3.0.2
 kotlin_version=2.0.20
 logback_version=1.4.14

samples/server/petstore/kotlin-server-modelMutable/build.gradle.kts

@@ -7,7 +7,8 @@ version = "1.0.0"
 
 plugins {
     kotlin("jvm") version "2.0.20"
-    id("io.ktor.plugin") version "2.3.12"
+    application
+    kotlin("plugin.serialization") version "2.0.20"
 }
 
 application {
@@ -22,14 +23,15 @@ repositories {
 }
 
 dependencies {
+    implementation(platform("io.ktor:ktor-bom:3.0.2"))
     implementation("ch.qos.logback:logback-classic:$logback_version")
     implementation("com.typesafe:config:1.4.1")
     implementation("io.ktor:ktor-server-auth")
     implementation("io.ktor:ktor-client-apache")
     implementation("io.ktor:ktor-server-auto-head-response")
     implementation("io.ktor:ktor-server-default-headers")
     implementation("io.ktor:ktor-server-content-negotiation")
-    implementation("io.ktor:ktor-serialization-gson")
+    implementation("io.ktor:ktor-serialization-kotlinx-json")
     implementation("io.ktor:ktor-server-resources")
     implementation("io.ktor:ktor-server-hsts")
     implementation("io.ktor:ktor-server-compression")

samples/server/petstore/kotlin-server-modelMutable/gradle.properties

@@ -1,4 +1,4 @@
 kotlin.code.style=official
-ktor_version=2.3.12
+ktor_version=3.0.2
 kotlin_version=2.0.20
 logback_version=1.4.14