io.javalin.core.validation.JavalinValidation.kt Maven / Gradle / Ivy

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/*
 * Javalin - https://javalin.io
 * Copyright 2017 David Åse
 * Licensed under Apache 2.0: https://github.com/tipsy/javalin/blob/master/LICENSE
 */

package io.javalin.core.validation

import io.javalin.Javalin

class MissingConverterException(val className: String) : RuntimeException()

object JavalinValidation {

    val converters = mutableMapOf, (String) -> Any?>(
        java.lang.Boolean::class.java to { s -> s.toBoolean() },
        java.lang.Double::class.java to { s -> s.toDouble() },
        java.lang.Float::class.java to { s -> s.toFloat() },
        java.lang.Integer::class.java to { s -> s.toInt() },
        java.lang.Long::class.java to { s -> s.toLong() },
        java.lang.String::class.java to { s -> s },
        Boolean::class.java to { s -> s.toBoolean() },
        Double::class.java to { s -> s.toDouble() },
        Float::class.java to { s -> s.toFloat() },
        Int::class.java to { s -> s.toInt() },
        Long::class.java to { s -> s.toLong() },
        String::class.java to { s -> s }
    )

    fun  convertValue(clazz: Class, value: String?): T {
        val converter = converters[clazz] ?: throw MissingConverterException(clazz.simpleName)
        return (if (value != null) converter.invoke(value) else null) as T
    }

    fun  hasConverter(clazz: Class) = converters[clazz] != null

    @JvmStatic
    fun register(clazz: Class<*>, converter: (String) -> Any?) = converters.put(clazz, converter)

    @JvmStatic
    fun collectErrors(vararg validators: BaseValidator<*>) = collectErrors(validators.toList())

    @JvmStatic
    fun collectErrors(validators: Iterable>): Map>> =
        validators.flatMap { it.errors().entries }.associate { it.key to it.value }

    @JvmStatic
    fun addValidationExceptionMapper(app: Javalin) {
        app.exception(ValidationException::class.java) { e, ctx ->
            ctx.json(e.errors).status(400)
        }
    }
}


fun Iterable>.collectErrors(): Map>> =
    JavalinValidation.collectErrors(this)