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Kora openapi-generator module
There is a newer version: 1.1.16
package {{package}}

import ru.tinkoff.kora.http.server.common.form.MultipartReader
import ru.tinkoff.kora.http.server.common.handler.HttpServerRequestMapper
import ru.tinkoff.kora.http.server.common.HttpServerRequest
{{#isSuspend}}
import java.util.concurrent.CompletionStage;
{{/isSuspend}}

@ru.tinkoff.kora.common.annotation.Generated("openapi generator kora server"){{#discriminator}}{{>typeInfoAnnotation}}{{/discriminator}}
interface {{classname}}ServerRequestMappers {
{{#operations}}
{{#operation}}
{{#hasFormParams}}
  @ru.tinkoff.kora.common.annotation.Generated("openapi generator kora server")
  class {{#lambda.titlecase}}{{operationId}}{{/lambda.titlecase}}FormParamRequestMapper{{#vendorExtensions.requiresFormParamMappers}}({{#vendorExtensions.formParamMappers}}
    private val {{paramName}}Converter: ru.tinkoff.kora.http.server.common.handler.StringParameterReader<{{paramType}}>,
{{/vendorExtensions.formParamMappers}}
  ){{/vendorExtensions.requiresFormParamMappers}}: HttpServerRequestMapper<{{#isSuspend}}CompletionStage<{{/isSuspend}}{{classname}}Controller.{{#lambda.titlecase}}{{operationId}}{{/lambda.titlecase}}FormParam{{#isSuspend}}>{{/isSuspend}}> {
    override fun apply(request: HttpServerRequest): {{#isSuspend}}CompletionStage<{{/isSuspend}}{{classname}}Controller.{{#lambda.titlecase}}{{operationId}}{{/lambda.titlecase}}FormParam{{#isSuspend}}>{{/isSuspend}} {
{{#vendorExtensions.urlEncodedForm}}
      return request.body().asArrayStage().thenApply { bytes ->
        val bodyString = bytes.decodeToString()
        val formData = ru.tinkoff.kora.http.server.common.form.FormUrlEncodedServerRequestMapper.read(bodyString)
{{#formParams}}
        val {{paramName}}Part = formData.get("{{baseName}}"){{#isArray}}
        val {{paramName}} = if ({{paramName}}Part == null) emptyList() else {{paramName}}Part.values()
{{/isArray}}{{^isArray}}{{#vendorExtensions.requiresMapper}}
        val {{paramName}} = if ({{paramName}}Part == null || {{paramName}}Part.values().isEmpty()) null else {{paramName}}Converter.read({{paramName}}Part.values().first())
{{/vendorExtensions.requiresMapper}}{{^vendorExtensions.requiresMapper}}
        val {{paramName}} = if ({{paramName}}Part == null || {{paramName}}Part.values().isEmpty()) null else {{paramName}}Part.values().first()
{{/vendorExtensions.requiresMapper}}{{#required}}
        if ({{paramName}} == null) {
          throw ru.tinkoff.kora.http.server.common.HttpServerResponseException.of(400, "Form key '{{baseName}}' is required")
        }
{{/required}}{{/isArray}}{{/formParams}}
        {{classname}}Controller.{{#lambda.titlecase}}{{operationId}}{{/lambda.titlecase}}FormParam(
          {{#formParams}}{{paramName}}{{^-last}}, {{/-last}}{{/formParams}}
        )
      }{{^isSuspend}}.toCompletableFuture().get(){{/isSuspend}}{{/vendorExtensions.urlEncodedForm}}{{#vendorExtensions.multipartForm}}
      class {{#lambda.titlecase}}{{operationId}}{{/lambda.titlecase}}FormParamState {
      {{#formParams}}
      {{#isFile}}  var {{paramName}}: ru.tinkoff.kora.http.common.form.FormMultipart.FormPart.MultipartFile? = null
      {{/isFile}}{{^isFile}}  var {{paramName}}: {{{dataType}}}? = null
      {{/isFile}}{{/formParams}}
      }
      return MultipartReader.read(request)
        .thenApply { parts ->
          val state = {{#lambda.titlecase}}{{operationId}}{{/lambda.titlecase}}FormParamState()
          for (part in parts) {
            when (part.name()) {
              {{#formParams}}
                      "{{baseName}}" -> {
                  {{#isFile}}  state.{{paramName}} = part
                  {{/isFile}}{{^isFile}}  state.{{paramName}} = part.content().decodeToString()
                  {{/isFile}}
                      }
              {{/formParams}}
              else -> {}
            }
          }
          {{#formParams}}{{#required}}
          if (state.{{paramName}} == null) {
            throw ru.tinkoff.kora.http.server.common.HttpServerResponseException.of(400, "Form key '{{baseName}}' is required")
          }
          {{/required}}{{/formParams}}
          {{classname}}Controller.{{#lambda.titlecase}}{{operationId}}{{/lambda.titlecase}}FormParam(
            {{#formParams}}state.{{paramName}}{{#required}}!!{{/required}}{{^-last}}, {{/-last}}{{/formParams}}
          )
        }{{^isSuspend}}.toCompletableFuture().get(){{/isSuspend}}
        {{/vendorExtensions.multipartForm}}
    }
  }
{{/hasFormParams}}
{{/operation}}
{{/operations}}
}