1 files changed, 62 insertions, 0 deletions
diff --git a/taler-kotlin-android/src/main/java/net/taler/common/TalerUri.kt b/taler-kotlin-android/src/main/java/net/taler/common/TalerUri.kt
new file mode 100644
index 0000000..999408c
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+++ b/taler-kotlin-android/src/main/java/net/taler/common/TalerUri.kt
@@ -0,0 +1,62 @@
+/*
+ * This file is part of GNU Taler
+ * (C) 2020 Taler Systems S.A.
+ *
+ * GNU Taler is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 3, or (at your option) any later version.
+ *
+ * GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ * A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+package net.taler.common
+
+import java.util.Locale
+
+public object TalerUri {
+
+    private const val SCHEME = "taler://"
+    private const val SCHEME_INSECURE = "taler+http://"
+    private const val AUTHORITY_PAY = "pay"
+    private const val AUTHORITY_WITHDRAW = "withdraw"
+    private const val AUTHORITY_REFUND = "refund"
+    private const val AUTHORITY_TIP = "tip"
+
+    public data class WithdrawUriResult(
+        val bankIntegrationApiBaseUrl: String,
+        val withdrawalOperationId: String
+    )
+
+    /**
+     * Parses a withdraw URI and returns a bank status URL or null if the URI was invalid.
+     */
+    public fun parseWithdrawUri(uri: String): WithdrawUriResult? {
+        val (resultScheme, prefix) = when {
+            uri.startsWith(SCHEME, ignoreCase = true) -> {
+                Pair("https://", "${SCHEME}${AUTHORITY_WITHDRAW}/")
+            }
+            uri.startsWith(SCHEME_INSECURE, ignoreCase = true) -> {
+                Pair("http://", "${SCHEME_INSECURE}${AUTHORITY_WITHDRAW}/")
+            }
+            else -> return null
+        }
+        if (!uri.startsWith(prefix, ignoreCase = true)) return null
+        val parts = uri.let {
+            (if (it.endsWith("/")) it.dropLast(1) else it).substring(prefix.length).split('/')
+        }
+        if (parts.size < 2) return null
+        val host = parts[0].lowercase(Locale.ROOT)
+        val pathSegments = parts.slice(1 until parts.size - 1).joinToString("/")
+        val withdrawId = parts.last()
+        if (withdrawId.isBlank()) return null
+        val url = "${resultScheme}${host}/${pathSegments}"
+
+        return WithdrawUriResult(url, withdrawId)
+    }
+
+}