smithy4s.http.internals.UrlFormDataDecoder.scala Maven / Gradle / Ivy

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/*
 *  Copyright 2021-2024 Disney Streaming
 *
 *  Licensed under the Tomorrow Open Source Technology License, Version 1.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *     https://disneystreaming.github.io/TOST-1.0.txt
 *
 *  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 smithy4s
package http
package internals

import smithy4s.codecs.PayloadPath

private[http] trait UrlFormDataDecoder[A] { self =>

  def decode(cursor: UrlFormCursor): Either[UrlFormDecodeError, A]

  def down(segment: PayloadPath.Segment): UrlFormDataDecoder[A] =
    cursor => self.decode(cursor.down(segment))

  def emap[B](f: A => Either[ConstraintError, B]): UrlFormDataDecoder[B] =
    cursor =>
      self.decode(cursor).flatMap {
        f(_) match {
          case Left(e) => Left(UrlFormDecodeError(cursor.history, e.message))
          case Right(value) => Right(value)
        }
      }

  def map[B](f: A => B): UrlFormDataDecoder[B] =
    cursor => self.decode(cursor).map(f)

  def optional: UrlFormDataDecoder[Option[A]] = {
    case UrlFormCursor(_, Nil) => Right(None)
    case other                 => self.decode(other).map(Some(_))
  }
}

private[internals] object UrlFormDataDecoder {

  def alwaysFailing[A](message: String): UrlFormDataDecoder[A] = cursor =>
    Left(UrlFormDecodeError(cursor.history, message))

  def fromStringParser[A](expectedType: String)(
      f: String => Option[A]
  ): UrlFormDataDecoder[A] = {
    case UrlFormCursor(
          history,
          List(UrlForm.FormData(PayloadPath.root, Some(value)))
        ) =>
      f(value).toRight(
        UrlFormDecodeError(
          history,
          s"Could not extract $expectedType from $value"
        )
      )

    case cursor =>
      Left(UrlFormDecodeError.singleValueExpected(cursor))
  }
}