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package com.chrisrebert.lmvtfy.server
import scala.util.{Try,Success,Failure}
import spray.routing.{Directive1, MalformedHeaderRejection, MalformedRequestContentRejection, ValidationRejection}
import spray.routing.directives.{BasicDirectives, HeaderDirectives, RouteDirectives, MarshallingDirectives}
import com.chrisrebert.lmvtfy.util.{HmacSha1,Utf8ByteArray}
trait HubSignatureDirectives {
import BasicDirectives.provide
import HeaderDirectives.headerValueByName
import RouteDirectives.reject
import MarshallingDirectives.{entity, as}
private val xHubSignature = "X-Hub-Signature"
private val hubSignatureHeaderValue = headerValueByName(xHubSignature)
val hubSignature: Directive1[Array[Byte]] = hubSignatureHeaderValue.flatMap { algoEqHex =>
val bytesFromHexOption = algoEqHex.split('=') match {
case Array("sha1", hex) => Try{ javax.xml.bind.DatatypeConverter.parseHexBinary(hex) }.toOption
case _ => None
}
bytesFromHexOption match {
case Some(bytesFromHex) => provide(bytesFromHex)
case None => reject(MalformedHeaderRejection(xHubSignature, "Malformed HMAC"))
}
}
private val bytesEntity = entity(as[Array[Byte]])
def stringEntityMatchingHubSignature(secretKey: Array[Byte]): Directive1[String] = hubSignature.flatMap { signature =>
bytesEntity.flatMap { dataBytes =>
val hmac = new HmacSha1(mac = signature, secretKey = secretKey, data = dataBytes)
if (hmac.isValid) {
dataBytes.utf8String match {
case Success(string) => provide(string)
case Failure(exc) => reject(MalformedRequestContentRejection("Request body is not valid UTF-8", Some(exc)))
}
}
else {
reject(ValidationRejection("Incorrect HMAC"))
}
}
}
}
object HubSignatureDirectives extends HubSignatureDirectives
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