List a user github gists using sttp for client http and circe for json processing with authentication. / published by https://github.com/dacr/code-examples-manager #74347314-f8f4-402e-88ff-0765b6365135/2b31693f5094fdf9af39d75bd0c2aeee132317e5

learn-gists-api-4-oauth-list-link-advanced.sc

// summary : List a user github gists using sttp for client http and circe for json processing with authentication.
// keywords : scala, sttp, circe, json, gists-api
// publish : gist
// authors : David Crosson
// license : Apache License Version 2.0 (https://www.apache.org/licenses/LICENSE-2.0.txt)
// id : 74347314-f8f4-402e-88ff-0765b6365135
// created-on : 2020-05-31T19:54:52Z
// managed-by : https://github.com/dacr/code-examples-manager
// execution : scala 2.12 ammonite script (http://ammonite.io/) - run as follow 'amm scriptname.sc'

//> using scala 2.12.20
//> using dep com.softwaremill.sttp::core:1.5.17
//> using dep com.softwaremill.sttp::circe:1.5.17
//> using dep io.circe::circe-generic:0.11.1 // Keep in sync with sttp.circe used circe release
////> using dep io.circe::circe-generic-extras:0.11.1 // Keep in sync with sttp.circe used circe release
//> using dep org.scalatest::scalatest:3.0.6

import com.softwaremill.sttp.Uri
import com.softwaremill.sttp.quick._
import com.softwaremill.sttp.circe._
//import io.circe.generic.extras._
import io.circe.generic.auto._

/* Get an authorized access to github gist API :
  - list authorizations : curl --user "dacr" https://api.github.com/authorizations
  - create token : curl https://api.github.com/authorizations --user "dacr" --data '{"scopes":["gist"],"note":"testoauth"}'
  - setup GIST_TOKEN environment variable with the previously generated token
  - get token : not possible of course
  - interesting link : https://gist.github.com/joyrexus/85bf6b02979d8a7b0308#oauth
*/

case class GistFile(
  filename:String,
  `type`:String,
  language:String,
  truncated:Boolean,
  content:String,
)
case class Gist(
  id:String,
  description:String,
  html_url:String,
  public:Boolean,
  //files:Map[String,GistFile], // Does not work by default
)

case class Token(value:String)

def getUserGists(user:String)(implicit token:Token):Stream[Gist] = {
  val nextLinkRE=""".*<([^>]+)>; rel="next".*""".r
  def worker(nextQuery:Option[Uri], currentRemaining:Iterable[Gist]):Stream[Gist] = {
    (nextQuery, currentRemaining) match {
      case (None, Nil) => Stream.empty
      case (_, head::tail) => head#::worker(nextQuery, tail)
      case (Some(query), Nil) =>
        val response = {
          sttp
            .get(query)
            .header("Authorization", s"token ${token.value}")
            .response(asJson[Array[Gist]])
            .send()
        }
        val gists = response.body.right.get.right.get.toList
        val next = response.header("Link") // it provides the link for the next & last page :)
        val newNextQuery = next.collect{case nextLinkRE(uri) => uri"$uri"}
        worker(newNextQuery, gists)
    }
  }
  val count=10
  val startQuery = uri"https://api.github.com/users/$user/gists?page=1&per_page=$count"
  worker(Some(startQuery), Nil)
}


def getGist(id:String)(implicit token:Token):Option[Gist]= ???


implicit val token = Token(scala.util.Properties.envOrElse("GIST_TOKEN", "invalid-token"))

val user = "dacr"
val gists = getUserGists(user)

println("gists count : "+gists.size)
println("private gists :")
gists.filterNot(_.public).foreach{ println }
println("private gists count : "+gists.filterNot(_.public).size)