[taler-wallet-kotlin] 02/04: Add Timestamp class with tests

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torsten-grote pushed a commit to branch master
in repository wallet-kotlin.

commit f86015ecbe8eb64b7d82bf445d69b5667a882fdf
Author: Torsten Grote <t@grobox.de>
AuthorDate: Wed Jun 24 14:59:31 2020 -0300

    Add Timestamp class with tests
---
 .../kotlin/net/taler/wallet/kotlin/Timestamp.kt    | 27 ++++++++
 .../net/taler/wallet/kotlin/TimestampTest.kt       | 75 ++++++++++++++++++++++
 2 files changed, 102 insertions(+)

diff --git a/src/commonMain/kotlin/net/taler/wallet/kotlin/Timestamp.kt 
b/src/commonMain/kotlin/net/taler/wallet/kotlin/Timestamp.kt
new file mode 100644
index 0000000..fbd6c65
--- /dev/null
+++ b/src/commonMain/kotlin/net/taler/wallet/kotlin/Timestamp.kt
@@ -0,0 +1,27 @@
+package net.taler.wallet.kotlin
+
+import net.taler.wallet.kotlin.crypto.CryptoImpl.Companion.toByteArray
+
+
+class Timestamp(
+    // @JsonProperty("t_ms")
+    val ms: Long
+) {
+
+    companion object {
+        const val NEVER: Long = -1
+    }
+
+    /**
+     * Returns a copy of this [Timestamp] rounded to seconds.
+     */
+    fun truncateSeconds(): Timestamp {
+        if (ms == NEVER) return Timestamp(ms)
+        return Timestamp((ms / 1000L) * 1000L)
+    }
+
+    fun roundedToByteArray(): ByteArray = ByteArray(8).apply {
+        (truncateSeconds().ms * 1000L).toByteArray().copyInto(this)
+    }
+
+}
diff --git a/src/commonTest/kotlin/net/taler/wallet/kotlin/TimestampTest.kt 
b/src/commonTest/kotlin/net/taler/wallet/kotlin/TimestampTest.kt
new file mode 100644
index 0000000..1a12549
--- /dev/null
+++ b/src/commonTest/kotlin/net/taler/wallet/kotlin/TimestampTest.kt
@@ -0,0 +1,75 @@
+/*
+ * 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.wallet.kotlin
+
+import kotlin.random.Random
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+class TimestampTest {
+
+    companion object {
+        fun getRandomTimestamp() = Timestamp(Random.nextLong(0, 
9007199254740991))
+    }
+
+    @Test
+    fun testRoundedToByteArray() {
+        val vectors = listOf<Pair<Long, String>>(
+            Pair(0, "0000000000000"),
+            Pair(23, "0000000000000"),
+            Pair(3349, "000000005Q3C0"),
+            Pair(61227, "00000003MB4M0"),
+            Pair(143879, "00000008GR0W0"),
+            Pair(8879237, "000000GH7B4W0"),
+            Pair(16058145, "000000XX46H80"),
+            Pair(270909464, "00000FRKDX4M0"),
+            Pair(5500325225, "0000A054XBSM0"),
+            Pair(52631835363, "0002ZQJDTGYC0"),
+            Pair(567067373675, "00107FN9AKAM0"),
+            Pair(1036693403335, "001TXQFY0VEC0"),
+            Pair(88636710366804, "04XED7JKDJSR0"),
+            Pair(852207301364437, "1F9TC1M0SEJG0"),
+            Pair(8312646819781097, "EDE78FC4AEXM0"),
+            Pair(7473472692572260, "CYVHQMAQAR7G0"),
+            Pair(1148188526507363, "1ZQJYRD9M40C0"),
+            Pair(5418115526173127, "9CRG6QASJ80M0"),
+            Pair(4046218176532046, "70KGVZK7XCPG0"),
+            Pair(2421361923399585, "46D6FNS4VAFW0"),
+            Pair(7305555710693483, "CNH8RDJYNV1M0"),
+            Pair(2857858080018042, "4YMJDJ1XYFM80"),
+            Pair(2037218281967033, "3H2TEEYTJCCW0"),
+            Pair(7912348432268295, "DQ74XYJCEFXG0"),
+            Pair(6416777738213721, "B46FJPQRT81M0"),
+            Pair(6914097778740296, "BZSWYK0W3NTG0"),
+            Pair(7090360690428000, "C9K0AYTABAVG0"),
+            Pair(1998560202566445, "3EY4ZTJR5QER0"),
+            Pair(7896179665141956, "DPADV4EQCHKM0"),
+            Pair(6266851558322330, "AVW58JG1WB880"),
+            Pair(1878397422799871, "388PH07WY68W0"),
+            Pair(3767372253320333, "6H46A6MZSMS00"),
+            Pair(8065344266359580, "DZPXQR6KHZ5W0"),
+            Pair(7947440620360995, "DS5FP8RA25H00"),
+            Pair(3414000286898485, "5XGFEB1VMC880"),
+            Pair(9007199254740991, "FKZZZZZZY3EG0")
+        ) // TODO add more test vectors beyond 9007199254740991 (typescript 
max of wallet-core)
+        for (v in vectors) {
+            val encodedBytes = 
Base32Crockford.encode(Timestamp(v.first).roundedToByteArray())
+            assertEquals(v.second, encodedBytes)
+        }
+    }
+
+}

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