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Multiparts.scala
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Multiparts.scala
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/*
* Copyright 2013 http4s.org
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.http4s.multipart
import cats.Functor
import cats.effect.Sync
import cats.effect.std.Random
import cats.syntax.all._
/** An algebra for creating multipart values and boundaries.
*
* A single instance may be shared by the entire application.
*/
trait Multiparts[F[_]] {
/** Generate a random multipart boundary */
def boundary: F[Boundary]
/** Generate a multipart value from Parts with a random multipart boundary */
def multipart(parts: Vector[Part[F]]): F[Multipart[F]]
}
object Multiparts {
/** Creates a `cats.effect.std.Random` and provides Multiparts around it.
* This instance can be shared, or is cheap enough to create closer
* to where Multipart values are generated.
*/
def forSync[F[_]](implicit F: Sync[F]): F[Multiparts[F]] =
Random.scalaUtilRandom[F].map(fromRandom[F])
def fromRandom[F[_]](random: Random[F])(implicit F: Functor[F]): Multiparts[F] =
new Multiparts[F] {
def boundary: F[Boundary] =
random.nextBytes(30).map(Boundary.unsafeFromBytes)
def multipart(parts: Vector[Part[F]]): F[Multipart[F]] =
F.map(boundary)(Multipart(parts, _))
}
}