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/*
* Copyright (c) 2022 AtLarge Research
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package org.opendc.web.client.auth
import com.fasterxml.jackson.databind.DeserializationFeature
import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper
import com.fasterxml.jackson.module.kotlin.readValue
import org.opendc.web.client.internal.OAuthTokenRequest
import org.opendc.web.client.internal.OAuthTokenResponse
import org.opendc.web.client.internal.OpenIdConfiguration
import java.net.URI
import java.net.http.HttpClient
import java.net.http.HttpRequest
import java.net.http.HttpResponse
/**
* An [AuthController] for OpenID Connect protected APIs.
*/
public class OpenIdAuthController(
private val domain: String,
private val clientId: String,
private val clientSecret: String,
private val audience: String = "https://api.opendc.org/v2/",
private val client: HttpClient = HttpClient.newHttpClient(),
) : AuthController {
/**
* The Jackson object mapper to convert messages from/to JSON.
*/
private val mapper =
jacksonObjectMapper()
.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false)
/**
* The cached [OpenIdConfiguration].
*/
private val openidConfig: OpenIdConfiguration
get() {
var openidConfig = localOpenidConfig
if (openidConfig == null) {
openidConfig = requestConfig()
localOpenidConfig = openidConfig
}
return openidConfig
}
private var localOpenidConfig: OpenIdConfiguration? = null
/**
* The cached OAuth token.
*/
private var localToken: OAuthTokenResponse? = null
override fun injectToken(request: HttpRequest.Builder) {
var token = localToken
if (token == null) {
token = requestToken()
localToken = token
}
request.header("Authorization", "Bearer ${token.accessToken}")
}
/**
* Refresh the current access token.
*/
override fun refreshToken() {
val refreshToken = localToken?.refreshToken
if (refreshToken == null) {
requestToken()
return
}
localToken = refreshToken(openidConfig, refreshToken)
}
/**
* Request the OpenID configuration from the chosen auth domain
*/
private fun requestConfig(): OpenIdConfiguration {
val request =
HttpRequest.newBuilder(URI("https://$domain/.well-known/openid-configuration"))
.GET()
.build()
val response = client.send(request, HttpResponse.BodyHandlers.ofInputStream())
return mapper.readValue(response.body())
}
/**
* Request the auth token from the server.
*/
private fun requestToken(openidConfig: OpenIdConfiguration): OAuthTokenResponse {
val body = OAuthTokenRequest.ClientCredentials(audience, clientId, clientSecret)
val request =
HttpRequest.newBuilder(openidConfig.tokenEndpoint)
.header("Content-Type", "application/json")
.POST(HttpRequest.BodyPublishers.ofByteArray(mapper.writeValueAsBytes(body)))
.build()
val response = client.send(request, HttpResponse.BodyHandlers.ofInputStream())
return mapper.readValue(response.body())
}
/**
* Helper method to refresh the auth token.
*/
private fun refreshToken(
openidConfig: OpenIdConfiguration,
refreshToken: String,
): OAuthTokenResponse {
val body = OAuthTokenRequest.RefreshToken(refreshToken, clientId, clientSecret)
val request =
HttpRequest.newBuilder(openidConfig.tokenEndpoint)
.header("Content-Type", "application/json")
.POST(HttpRequest.BodyPublishers.ofByteArray(mapper.writeValueAsBytes(body)))
.build()
val response = client.send(request, HttpResponse.BodyHandlers.ofInputStream())
return mapper.readValue(response.body())
}
/**
* Fetch a new access token.
*/
private fun requestToken(): OAuthTokenResponse {
val token = requestToken(openidConfig)
localToken = token
return token
}
}
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