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Merge pull request #473 from believethehype/cashuredeem

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Melt cashu tokens in Mint directly instead of using webservice
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Vitor Pamplona 2023-06-26 14:26:44 -04:00 committed by GitHub
commit 26b493aa1d
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1 changed files with 66 additions and 10 deletions
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76
app/src/main/java/com/vitorpamplona/amethyst/ui/components/CashuRedeem.kt
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@ -2,6 +2,7 @@ package com.vitorpamplona.amethyst.ui.components
import android.content.Intent
import android.net.Uri
import android.widget.Toast
import androidx.compose.foundation.border
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
@ -21,20 +22,29 @@ import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp
import androidx.core.content.ContextCompat.startActivity
import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper
import com.google.gson.JsonObject
import com.google.gson.JsonParser
import com.vitorpamplona.amethyst.R
import com.vitorpamplona.amethyst.service.lnurl.LightningAddressResolver
import com.vitorpamplona.amethyst.ui.screen.loggedIn.AccountViewModel
import com.vitorpamplona.amethyst.ui.theme.QuoteBorder
import com.vitorpamplona.amethyst.ui.theme.subtleBorder
import kotlinx.coroutines.launch
import okhttp3.MediaType.Companion.toMediaType
import okhttp3.OkHttpClient
import okhttp3.Request
import okhttp3.RequestBody.Companion.toRequestBody
import java.util.Base64
@Composable
fun CashuPreview(cashutoken: String, accountViewModel: AccountViewModel) {
val useWebService = false
val context = LocalContext.current
val lnaddress = accountViewModel.account.userProfile().info?.lud16
val scope = rememberCoroutineScope()
val lud16 = accountViewModel.account.userProfile().info?.lud16
val base64token = cashutoken.replace("cashuA", "")
val cashu = JsonParser.parseString(String(Base64.getDecoder().decode(base64token)))
val token = cashu.asJsonObject.get("token").asJsonArray[0].asJsonObject
val proofs = token["proofs"].asJsonArray
val mint = token["mint"]
@ -43,7 +53,7 @@ fun CashuPreview(cashutoken: String, accountViewModel: AccountViewModel) {
for (proof in proofs) {
totalamount += proof.asJsonObject["amount"].asInt
}
var fees = Math.max(((totalamount * 0.02).toInt()), 2)
Column(
modifier = Modifier
.fillMaxWidth()
@ -95,15 +105,61 @@ fun CashuPreview(cashutoken: String, accountViewModel: AccountViewModel) {
.fillMaxWidth()
.padding(vertical = 10.dp),
onClick = {
runCatching {
// Alternative directly from client: call POST https://{mint}/melt with body
// {
// "proofs: {proofs},
// "pr": {create ln invoice with totalamount * 0.98, at least -2 sats}
// }
val url = "https://redeem.cashu.me?token=$cashutoken&lightning=$lnaddress&autopay=true"
// Just in case we want to use a webservice instead of directly contacting the mint
if (useWebService) {
val url = "https://redeem.cashu.me?token=$cashutoken&lightning=$lud16&autopay=true"
val intent = Intent(Intent.ACTION_VIEW, Uri.parse(url))
startActivity(context, intent, null)
} else {
if (lud16 != null) {
runCatching {
LightningAddressResolver().lnAddressInvoice(
lud16,
((totalamount - fees) * 1000).toLong(), // Make invoice and leave room for fees
"Reedem Cashu",
onSuccess = {
val invoice = it
val client = OkHttpClient()
var url = mint.asString + "/melt" // Melt cashu tokens at Mint
val jsonObject = JsonObject()
jsonObject.add("proofs", proofs)
jsonObject.addProperty("pr", invoice)
val mediaType = "application/json; charset=utf-8".toMediaType()
val requestBody = jsonObject.toString().toRequestBody(mediaType)
val request = Request.Builder()
.url(url)
.post(requestBody)
.build()
val response = client.newCall(request).execute()
val body = response.body?.string()
val tree = jacksonObjectMapper().readTree(body)
if (tree?.get("paid")?.asText() == "true") {
scope.launch {
Toast.makeText(context, "Redeemed " + (totalamount - fees) + " Sats" + " (Fees: " + fees + " Sats)", Toast.LENGTH_SHORT).show()
}
} else {
scope.launch {
Toast.makeText(context, tree?.get("detail")?.asText()?.split('.')?.get(0) + "." ?: "Error", Toast.LENGTH_SHORT).show()
}
}
},
onProgress = {
},
onError = {
scope.launch {
Toast.makeText(context, it, Toast.LENGTH_SHORT).show()
}
}
)
}
} else {
scope.launch {
Toast.makeText(context, "No Lightning Address set", Toast.LENGTH_SHORT).show()
}
}
}
},
shape = QuoteBorder,