parse cashu tokens

app/src/main/java/com/vitorpamplona/amethyst/ui/components/CashuRedeem.kt

@@ -0,0 +1,88 @@
+package com.vitorpamplona.amethyst.ui.components
+
+import android.content.Intent
+import android.net.Uri
+import androidx.compose.foundation.border
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.material.*
+import androidx.compose.runtime.*
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.painterResource
+import androidx.compose.ui.res.stringResource
+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.vitorpamplona.amethyst.R
+import com.vitorpamplona.amethyst.ui.screen.loggedIn.AccountViewModel
+import com.vitorpamplona.amethyst.ui.theme.QuoteBorder
+import com.vitorpamplona.amethyst.ui.theme.subtleBorder
+
+@Composable
+fun CashuPreview(cashutoken: String, accountViewModel: AccountViewModel) {
+    val context = LocalContext.current
+    val lnaddress = accountViewModel.account.userProfile().info?.lud16
+    Column(
+        modifier = Modifier
+            .fillMaxWidth()
+            .padding(start = 30.dp, end = 30.dp)
+            .clip(shape = QuoteBorder)
+            .border(1.dp, MaterialTheme.colors.subtleBorder, QuoteBorder)
+    ) {
+        Column(
+            modifier = Modifier
+                .fillMaxWidth()
+                .padding(30.dp)
+        ) {
+            Row(
+                verticalAlignment = Alignment.CenterVertically,
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .padding(bottom = 10.dp)
+            ) {
+                Icon(
+                    painter = painterResource(R.drawable.cashu),
+                    null,
+                    modifier = Modifier.size(20.dp),
+                    tint = Color.Unspecified
+                )
+
+                Text(
+                    text = stringResource(R.string.cashu),
+                    fontSize = 20.sp,
+                    fontWeight = FontWeight.W500,
+                    modifier = Modifier.padding(start = 10.dp)
+                )
+            }
+
+            Divider()
+
+            Button(
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .padding(vertical = 10.dp),
+                onClick = {
+                    runCatching {
+                        val url = "https://redeem.cashu.me?token=$cashutoken&lightning=$lnaddress"
+                        val intent = Intent(Intent.ACTION_VIEW, Uri.parse(url))
+                        startActivity(context, intent, null)
+                    }
+                },
+                shape = QuoteBorder,
+                colors = ButtonDefaults.buttonColors(
+                    backgroundColor = MaterialTheme.colors.primary
+                )
+            ) {
+                Text(stringResource(R.string.cashu_redeem), color = Color.White, fontSize = 20.sp)
+            }
+        }
+    }
+}

app/src/main/java/com/vitorpamplona/amethyst/ui/components/RichTextViewer.kt

@@ -260,7 +260,7 @@ private fun parseUrls(
 }
 
 enum class WordType {
-    IMAGE, LINK, EMOJI, INVOICE, WITHDRAW, EMAIL, PHONE, BECH, HASH_INDEX, HASHTAG, SCHEMELESS_URL, OTHER
+    IMAGE, LINK, EMOJI, INVOICE, WITHDRAW, CASHU, EMAIL, PHONE, BECH, HASH_INDEX, HASHTAG, SCHEMELESS_URL, OTHER
 }
 
 @Composable
@@ -284,6 +284,8 @@ private fun RenderWord(
             WordType.INVOICE
         } else if (word.startsWith("lnurl", true)) {
             WordType.WITHDRAW
+        } else if (word.startsWith("cashu", true) && word.endsWith("==", true)) {
+            WordType.CASHU
         } else if (Patterns.EMAIL_ADDRESS.matcher(word).matches()) {
             WordType.EMAIL
         } else if (word.length > 6 && Patterns.PHONE.matcher(word).matches()) {
@@ -339,6 +341,7 @@ private fun RenderWordWithoutPreview(
         WordType.INVOICE -> NormalWord(wordSpace)
         // Don't offer to withdraw
         WordType.WITHDRAW -> NormalWord(wordSpace)
+        WordType.CASHU -> NormalWord(wordSpace)
         WordType.EMAIL -> ClickableEmail(word)
         WordType.PHONE -> ClickablePhone(word)
         WordType.BECH -> BechLink(word, false, backgroundColor, accountViewModel, nav)
@@ -369,6 +372,7 @@ private fun RenderWordWithPreview(
         WordType.EMOJI -> RenderCustomEmoji(word, state)
         WordType.INVOICE -> MayBeInvoicePreview(word)
         WordType.WITHDRAW -> MayBeWithdrawal(word)
+        WordType.CASHU -> CashuPreview(word, accountViewModel)
         WordType.EMAIL -> ClickableEmail(word)
         WordType.PHONE -> ClickablePhone(word)
         WordType.BECH -> BechLink(word, true, backgroundColor, accountViewModel, nav)

app/src/main/res/values/strings.xml

@@ -456,6 +456,8 @@
     <string name="minimum_pow">Minimum PoW</string>
     <string name="auth">Auth</string>
     <string name="payment">Payment</string>
+    <string name="cashu">Cashu ecash</string>
+    <string name="cashu_redeem">Redeem Sats</string>
 
     <string name="live_stream_live_tag">LIVE</string>
     <string name="live_stream_offline_tag">OFFLINE</string>