invirt.http4k.views.InvirtPebbleTemplates.kt Maven / Gradle / Ivy

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There is a newer version: 0.10.11
package invirt.http4k.views

import invirt.http4k.currentHttp4kRequest
import io.github.oshai.kotlinlogging.KotlinLogging
import io.pebbletemplates.pebble.PebbleEngine
import io.pebbletemplates.pebble.error.LoaderException
import io.pebbletemplates.pebble.loader.ClasspathLoader
import io.pebbletemplates.pebble.loader.FileLoader
import org.http4k.template.TemplateRenderer
import org.http4k.template.Templates
import org.http4k.template.ViewModel
import org.http4k.template.ViewNotFound
import java.io.StringWriter

private val log = KotlinLogging.logger {}

class InvirtPebbleTemplates(
    private val configure: (PebbleEngine.Builder) -> PebbleEngine.Builder = { it },
    private val classLoader: ClassLoader = ClassLoader.getSystemClassLoader()
) : Templates {

    private class PebbleTemplateRenderer(private val engine: PebbleEngine) : TemplateRenderer {
        override fun invoke(viewModel: ViewModel): String {
            var template = viewModel.template()
            if (!template.endsWith(".peb")) {
                template += ".peb"
            }

            return try {
                val writer = StringWriter()

                val context = if (viewModel is ErrorResponseView) {
                    currentHttp4kRequest!!.setErrors(viewModel.errors)
                    mapOf("model" to viewModel.model, "errors" to viewModel.errors)
                } else {
                    mapOf("model" to viewModel)
                }

                engine.getTemplate(template).evaluate(
                    writer,
                    context.plus("request" to currentHttp4kRequest)
                )
                writer.toString()
            } catch (e: LoaderException) {
                log.error(e) { "Error loading template $template: ${e.message}" }
                throw ViewNotFound(viewModel)
            }
        }
    }

    override fun CachingClasspath(baseClasspathPackage: String): TemplateRenderer {
        val loader = ClasspathLoader(classLoader)
        loader.prefix = if (baseClasspathPackage.isEmpty()) null else baseClasspathPackage.replace('.', '/')
        return PebbleTemplateRenderer(configure(PebbleEngine.Builder().loader(loader)).build())
    }

    override fun Caching(baseTemplateDir: String): TemplateRenderer {
        val loader = FileLoader()
        loader.prefix = baseTemplateDir
        return PebbleTemplateRenderer(configure(PebbleEngine.Builder().cacheActive(true).loader(loader)).build())
    }

    override fun HotReload(baseTemplateDir: String): TemplateRenderer {
        val loader = FileLoader()
        loader.prefix = baseTemplateDir
        return PebbleTemplateRenderer(configure(PebbleEngine.Builder().cacheActive(false).loader(loader)).build())
    }
}