credentials/credentials/src/main/java/androidx/credentials/webauthn/PublicKeyCredentialCreationOptions.kt

/*
 * Copyright 2023 The Android Open Source Project
 *
 * 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 androidx.credentials.webauthn

import android.util.Log
import androidx.annotation.RestrictTo
import org.json.JSONObject

@RestrictTo(RestrictTo.Scope.LIBRARY)
class PublicKeyCredentialCreationOptions(requestJson: String) {
    val json: JSONObject

    val rp: PublicKeyCredentialRpEntity
    val user: PublicKeyCredentialUserEntity
    val challenge: ByteArray
    val pubKeyCredParams: List<PublicKeyCredentialParameters>

    var timeout: Long
    var excludeCredentials: List<PublicKeyCredentialDescriptor>
    var authenticatorSelection: AuthenticatorSelectionCriteria
    var attestation: String

    init {
        json = JSONObject(requestJson)
        val challengeString = json.getString("challenge")
        challenge = WebAuthnUtils.b64Decode(challengeString)
        val rpJson = json.getJSONObject("rp")
        rp = PublicKeyCredentialRpEntity(rpJson.getString("name"), rpJson.getString("id"))
        val rpUser = json.getJSONObject("user")
        val userId = WebAuthnUtils.b64Decode(rpUser.getString("id"))
        user =
            PublicKeyCredentialUserEntity(
                rpUser.getString("name"),
                userId,
                rpUser.getString("displayName")
            )
        val pubKeyCredParamsJson = json.getJSONArray("pubKeyCredParams")
        val pubKeyCredParamsTmp: MutableList<PublicKeyCredentialParameters> = mutableListOf()
        for (i in 0 until pubKeyCredParamsJson.length()) {
            val e = pubKeyCredParamsJson.getJSONObject(i)
            pubKeyCredParamsTmp.add(
                PublicKeyCredentialParameters(e.getString("type"), e.getLong("alg"))
            )
        }
        pubKeyCredParams = pubKeyCredParamsTmp.toList()

        timeout = json.optLong("timeout", 0)
        // TODO: Fix excludeCredentials and authenticatorSelection
        excludeCredentials = emptyList()
        authenticatorSelection = AuthenticatorSelectionCriteria("platform", "required")
        attestation = json.optString("attestation", "none")

        Log.i("WebAuthn", "Challenge $challenge()")
        Log.i("WebAuthn", "rp $rp")
        Log.i("WebAuthn", "user $user")
        Log.i("WebAuthn", "pubKeyCredParams $pubKeyCredParams")
        Log.i("WebAuthn", "timeout $timeout")
        Log.i("WebAuthn", "excludeCredentials $excludeCredentials")
        Log.i("WebAuthn", "authenticatorSelection $authenticatorSelection")
        Log.i("WebAuthn", "attestation $attestation")
    }
}