examples/android/CHIPTool/app/src/main/java/com/google/chip/chiptool/setuppayloadscanner/CHIPLedgerDetailsFragment.kt

/*
 *   Copyright (c) 2021 Project CHIP Authors
 *   All rights reserved.
 *
 *   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 com.google.chip.chiptool.setuppayloadscanner

import android.net.Uri
import android.os.Bundle
import android.util.Base64
import android.util.Log
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.fragment.app.Fragment
import com.android.volley.Request
import com.android.volley.toolbox.JsonObjectRequest
import com.android.volley.toolbox.Volley
import com.google.chip.chiptool.R
import com.google.chip.chiptool.util.FragmentUtil
import com.google.gson.Gson
import kotlinx.android.synthetic.main.chip_ledger_info_fragment.view.vendorIdTv
import kotlinx.android.synthetic.main.chip_ledger_info_fragment.view.productIdTv
import kotlinx.android.synthetic.main.chip_ledger_info_fragment.view.commissioningFlowUrlTv
import kotlinx.android.synthetic.main.chip_ledger_info_fragment.view.redirectBtn

/** Show the [CHIPDeviceInfo] from Ledger */
class CHIPLedgerDetailsFragment : Fragment() {

  private lateinit var deviceInfo: CHIPDeviceInfo

  override fun onCreateView(
    inflater: LayoutInflater,
    container: ViewGroup?,
    savedInstanceState: Bundle?
  ): View {

    deviceInfo = checkNotNull(requireArguments().getParcelable(ARG_DEVICE_INFO))
    val queue = Volley.newRequestQueue(context)
    return inflater.inflate(R.layout.chip_ledger_info_fragment, container, false).apply {

      // VID / PID
      vendorIdTv.text = "${deviceInfo.vendorId}"
      productIdTv.text = "${deviceInfo.productId}"

      // Ledger api url
      val url = Uri.parse(context.getString(R.string.dcl_api_root_url))
        .buildUpon()
        .appendPath("${deviceInfo.vendorId}")
        .appendPath("${deviceInfo.productId}")
        .build().toString()
      Log.d(TAG, "Dcl request Url: $url")

      // Ledger API call
      val jsonObjectRequest = JsonObjectRequest(
        Request.Method.GET, url, null,
        { response ->
          Log.d(TAG, "Response from dcl $response")

          // parse redirect Url
          val responseJson = response.getJSONObject(context.getString(R.string.dcl_response_key))
          val redirectUrl = responseJson.getString(context.getString(R.string.dcl_custom_flow_url_key))
          Log.d(TAG, "Redirect Url from Ledger: $redirectUrl")
          commissioningFlowUrlTv.text = redirectUrl

          // generate redirect payload
          val gson = Gson()
          val payloadJson = gson.toJson(deviceInfo)
          val payloadBase64 = Base64.encodeToString(payloadJson.toByteArray(), Base64.DEFAULT)
          val redirectUrlWithPayload= Uri.parse(redirectUrl)
              .buildUpon()
              .appendQueryParameter("payload", payloadBase64)
              .appendQueryParameter("returnUrl", context.getString(R.string.custom_flow_return_url))
              .build()
              .toString()

          Log.d(TAG, "Redirect Url with Payload: $redirectUrlWithPayload")
          redirectBtn.setOnClickListener {
            FragmentUtil.getHost(this@CHIPLedgerDetailsFragment, Callback::class.java)
              ?.handleCustomFlowRedirectClicked(redirectUrlWithPayload)
          }

          // enable redirect button
          redirectBtn.visibility = View.VISIBLE
        },
        { error ->
          Log.e(TAG, "Dcl request failed: $error")
          commissioningFlowUrlTv.text = context.getString(R.string.chip_ledger_info_commissioning_flow_url_not_available)
        }
      )
      queue.add(jsonObjectRequest)
    }
  }

  /** Interface for notifying the host. */
  interface Callback {
    /** Notifies listener of Custom flow redirect button click. */
    fun handleCustomFlowRedirectClicked(redirectUrl: String)
  }

  companion object {
    private const val TAG = "CUSTOM_FLOW"
    private const val ARG_DEVICE_INFO = "device_info"

    @JvmStatic
    fun newInstance(deviceInfo: CHIPDeviceInfo): CHIPLedgerDetailsFragment {
      return CHIPLedgerDetailsFragment().apply {
        arguments = Bundle(1).apply { putParcelable(ARG_DEVICE_INFO, deviceInfo) }
      }
    }
  }
}