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GoogleOAuth2.scala
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GoogleOAuth2.scala
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/*
* Copyright 2021 Arman Bilge
*
* 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 gcp4s.auth
import cats.effect.kernel.Clock
import cats.effect.kernel.Concurrent
import cats.syntax.all.*
import io.circe.Encoder
import org.http4s.Method.POST
import org.http4s.Request
import org.http4s.UrlForm
import org.http4s.client.Client
import org.http4s.client.dsl.Http4sClientDsl
import org.http4s.multipart.Multipart
import org.http4s.multipart.Part
import org.http4s.syntax.all.*
import scodec.bits.ByteVector
import scala.concurrent.duration.*
trait GoogleOAuth2[F[_]]:
def getAccessToken(
clientEmail: String,
privateKey: ByteVector,
scopes: Seq[String]): F[AccessToken]
object GoogleOAuth2:
def apply[F[_]: Concurrent: Clock: Jwt](client: Client[F]): GoogleOAuth2[F] =
new GoogleOAuth2 with Http4sClientDsl[F]:
val endpoint = uri"https://oauth2.googleapis.com/token"
def getAccessToken(
clientEmail: String,
privateKey: ByteVector,
scopes: Seq[String]): F[AccessToken] = for
jwt <- Jwt[F].sign(
JwtClaimContent(scopes.mkString(" ")),
endpoint.renderString,
clientEmail,
1.hour,
privateKey
)
request = POST(
UrlForm(
"grant_type" -> "urn:ietf:params:oauth:grant-type:jwt-bearer",
"assertion" -> jwt
),
endpoint)
accessToken <- client.expect[AccessToken](request)
yield accessToken
final private case class JwtClaimContent(scope: String) derives Encoder.AsObject