102 lines
3.5 KiB
Kotlin
102 lines
3.5 KiB
Kotlin
package cash.z.ecc.android.sdk.demoapp.demos.getprivatekey
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import android.os.Bundle
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import android.view.LayoutInflater
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import android.view.View
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import android.view.ViewGroup
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import androidx.lifecycle.lifecycleScope
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import cash.z.ecc.android.bip39.Mnemonics
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import cash.z.ecc.android.bip39.toSeed
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import cash.z.ecc.android.sdk.demoapp.BaseDemoFragment
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import cash.z.ecc.android.sdk.demoapp.databinding.FragmentGetPrivateKeyBinding
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import cash.z.ecc.android.sdk.demoapp.ext.requireApplicationContext
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import cash.z.ecc.android.sdk.demoapp.type.fromResources
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import cash.z.ecc.android.sdk.model.Account
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import cash.z.ecc.android.sdk.model.ZcashNetwork
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import cash.z.ecc.android.sdk.tool.DerivationTool
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import kotlinx.coroutines.launch
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/**
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* Displays the viewing key and spending key associated with the seed used during the demo. The
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* seedPhrase defaults to the value of`DemoConfig.seedWords` but can be set by the user on the
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* HomeFragment.
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*/
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class GetPrivateKeyFragment : BaseDemoFragment<FragmentGetPrivateKeyBinding>() {
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private lateinit var seedPhrase: String
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private lateinit var seed: ByteArray
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/**
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* Initialize the required values that would normally live outside the demo but are repeated
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* here for completeness so that each demo file can serve as a standalone example.
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*/
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private fun setup() {
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// defaults to the value of `DemoConfig.seedWords` but can also be set by the user
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seedPhrase = sharedViewModel.seedPhrase.value
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// Use a BIP-39 library to convert a seed phrase into a byte array. Most wallets already
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// have the seed stored
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seed = Mnemonics.MnemonicCode(seedPhrase).toSeed()
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}
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private fun displayKeys() {
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// derive the keys from the seed:
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// demonstrate deriving spending keys for five accounts but only take the first one
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lifecycleScope.launchWhenStarted {
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@Suppress("MagicNumber")
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val spendingKey = DerivationTool.deriveUnifiedSpendingKey(
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seed,
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ZcashNetwork.fromResources(requireApplicationContext()),
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Account(5)
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)
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// derive the key that allows you to view but not spend transactions
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val viewingKey = DerivationTool.deriveUnifiedFullViewingKey(
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spendingKey,
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ZcashNetwork.fromResources(requireApplicationContext())
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)
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// display the keys in the UI
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binding.textInfo.setText("Spending Key:\n$spendingKey\n\nViewing Key:\n$viewingKey")
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}
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}
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//
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// Android Lifecycle overrides
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//
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override fun onCreateView(
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inflater: LayoutInflater,
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container: ViewGroup?,
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savedInstanceState: Bundle?
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): View? {
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val view = super.onCreateView(inflater, container, savedInstanceState)
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setup()
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return view
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}
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override fun onResume() {
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super.onResume()
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displayKeys()
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}
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//
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// Base Fragment overrides
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//
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override fun onActionButtonClicked() {
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lifecycleScope.launch {
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copyToClipboard(
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DerivationTool.deriveUnifiedFullViewingKeys(
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seed,
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ZcashNetwork.fromResources(requireApplicationContext())
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).first().encoding,
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"UnifiedFullViewingKey copied to clipboard!"
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)
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}
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}
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override fun inflateBinding(layoutInflater: LayoutInflater): FragmentGetPrivateKeyBinding =
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FragmentGetPrivateKeyBinding.inflate(layoutInflater)
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}
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