[pos] create merchant-lib and move first v1 API endpoint there

5 files changed, 201 insertions, 0 deletions

diff --git a/merchant-lib/src/main/AndroidManifest.xml b/merchant-lib/src/main/AndroidManifest.xml
new file mode 100644
index 0000000..7318c07
--- /dev/null
+++ b/merchant-lib/src/main/AndroidManifest.xml
@@ -0,0 +1,23 @@
+<!--
+  ~ 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/>
+  -->
+
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="net.taler.merchantlib">
+
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+    <uses-permission android:name="android.permission.INTERNET" />
+
+</manifest>
diff --git a/merchant-lib/src/main/java/net/taler/merchantlib/ConfigResponse.kt b/merchant-lib/src/main/java/net/taler/merchantlib/ConfigResponse.kt
new file mode 100644
index 0000000..49164e6
--- /dev/null
+++ b/merchant-lib/src/main/java/net/taler/merchantlib/ConfigResponse.kt
@@ -0,0 +1,34 @@
+/*
+ * 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.merchantlib
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class ConfigResponse(
+    /**
+     * libtool-style representation of the Merchant protocol version, see
+     * https://www.gnu.org/software/libtool/manual/html_node/Versioning.html#Versioning
+     * The format is "current:revision:age".
+     */
+    val version: String,
+
+    /**
+    Currency supported by this backend.
+     */
+    val currency: String
+)
diff --git a/merchant-lib/src/main/java/net/taler/merchantlib/MerchantApi.kt b/merchant-lib/src/main/java/net/taler/merchantlib/MerchantApi.kt
new file mode 100644
index 0000000..656b093
--- /dev/null
+++ b/merchant-lib/src/main/java/net/taler/merchantlib/MerchantApi.kt
@@ -0,0 +1,43 @@
+/*
+ * 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.merchantlib
+
+import io.ktor.client.HttpClient
+import io.ktor.client.engine.okhttp.OkHttp
+import io.ktor.client.features.json.JsonFeature
+import io.ktor.client.features.json.serializer.KotlinxSerializer
+import io.ktor.client.request.get
+import io.ktor.client.request.header
+import io.ktor.http.HttpHeaders.Authorization
+
+class MerchantApi(private val httpClient: HttpClient) {
+
+    constructor() : this(getDefaultHttpClient())
+
+    suspend fun getConfig(baseUrl: String, apiKey: String = "sandbox"): ConfigResponse {
+        return httpClient.get("$baseUrl/config") {
+            header(Authorization, "ApiKey $apiKey")
+        }
+    }
+
+}
+
+private fun getDefaultHttpClient(): HttpClient = HttpClient(OkHttp) {
+    install(JsonFeature) {
+        serializer = KotlinxSerializer()
+    }
+}
diff --git a/merchant-lib/src/test/java/net/taler/merchantlib/MerchantApiTest.kt b/merchant-lib/src/test/java/net/taler/merchantlib/MerchantApiTest.kt
new file mode 100644
index 0000000..6b2199b
--- /dev/null
+++ b/merchant-lib/src/test/java/net/taler/merchantlib/MerchantApiTest.kt
@@ -0,0 +1,43 @@
+/*
+ * 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.merchantlib
+
+import kotlinx.coroutines.runBlocking
+import net.taler.merchantlib.MockHttpClient.giveJsonResponse
+import net.taler.merchantlib.MockHttpClient.httpClient
+import org.junit.Assert.assertEquals
+import org.junit.Test
+
+class MerchantApiTest {
+
+    private val api = MerchantApi(httpClient)
+
+    @Test
+    fun testGetConfig() = runBlocking {
+        httpClient.giveJsonResponse("https://backend.int.taler.net/config") {
+            """
+            {
+              "currency": "INTKUDOS",
+              "version": "0:0:0"
+            }
+            """.trimIndent()
+        }
+        val response = api.getConfig("https://backend.int.taler.net")
+        assertEquals(ConfigResponse("0:0:0", "INTKUDOS"), response)
+    }
+
+}
diff --git a/merchant-lib/src/test/java/net/taler/merchantlib/MockHttpClient.kt b/merchant-lib/src/test/java/net/taler/merchantlib/MockHttpClient.kt
new file mode 100644
index 0000000..076b77e
--- /dev/null
+++ b/merchant-lib/src/test/java/net/taler/merchantlib/MockHttpClient.kt
@@ -0,0 +1,58 @@
+/*
+ * 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.merchantlib
+
+import io.ktor.client.HttpClient
+import io.ktor.client.engine.mock.MockEngine
+import io.ktor.client.engine.mock.MockEngineConfig
+import io.ktor.client.engine.mock.respond
+import io.ktor.client.features.json.JsonFeature
+import io.ktor.client.features.json.serializer.KotlinxSerializer
+import io.ktor.http.ContentType.Application.Json
+import io.ktor.http.Url
+import io.ktor.http.fullPath
+import io.ktor.http.headersOf
+import io.ktor.http.hostWithPort
+
+object MockHttpClient {
+
+    val httpClient = HttpClient(MockEngine) {
+        install(JsonFeature) {
+            serializer = KotlinxSerializer()
+        }
+        engine {
+            addHandler { error("No response handler set") }
+        }
+    }
+
+    fun HttpClient.giveJsonResponse(url: String, jsonProducer: () -> String) {
+        val httpConfig = engineConfig as MockEngineConfig
+        httpConfig.requestHandlers.removeAt(0)
+        httpConfig.requestHandlers.add { request ->
+            if (request.url.fullUrl == url) {
+                val headers = headersOf("Content-Type" to listOf(Json.toString()))
+                respond(jsonProducer(), headers = headers)
+            } else {
+                error("Unexpected URL: ${request.url.fullUrl}")
+            }
+        }
+    }
+
+    private val Url.hostWithPortIfRequired: String get() = if (port == protocol.defaultPort) host else hostWithPort
+    private val Url.fullUrl: String get() = "${protocol.name}://$hostWithPortIfRequired$fullPath"
+
+}