Commit initial implementation

Author: Krystosterone

.gitignore

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+*.DS_Store
+*.gradle
+*.iml
+
+PaymentApp/.externalNativeBuild
+PaymentApp/.idea/libraries
+PaymentApp/.idea/workspace.xml
+
+PaymentApp/build
+PaymentApp/captures
+PaymentApp/local.properties

PaymentApp/app/.gitignore

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+/build

PaymentApp/app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# By default, the flags in this file are appended to flags specified
+# in /Users/krystosterone/Library/Android/sdk/tools/proguard/proguard-android.txt
+# You can edit the include path and order by changing the proguardFiles
+# directive in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# Add any project specific keep options here:
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

PaymentApp/app/src/androidTest/java/com/shopify/paymentapp/ExampleInstrumentedTest.java

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+package com.shopify.paymentapp;
+
+import android.content.Context;
+import android.support.test.InstrumentationRegistry;
+import android.support.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumentation test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() throws Exception {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getTargetContext();
+
+        assertEquals("com.shopify.paymentapp", appContext.getPackageName());
+    }
+}

PaymentApp/app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.shopify.paymentapp">
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/AppTheme">
+        <activity android:name=".HomeActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+        <activity
+            android:name=".PaymentActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="org.chromium.intent.action.PAY" />
+            </intent-filter>
+            <meta-data
+                android:name="org.chromium.default_payment_method_name"
+                android:value="interledger" />
+        </activity>
+    </application>
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>

PaymentApp/app/src/main/java/com/shopify/paymentapp/Credentials.java

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+package com.shopify.paymentapp;
+
+/**
+ * Created by krystosterone on 2017-06-07.
+ */
+
+public enum Credentials {
+    LEDGER_URL("https://red.ilpdemo.org"),
+    LEDGER_ILP("[email protected]"),
+    LEDGER_AUTH_TOKEN("YWxpY2U6YWxpY2U="); // base64(alice:alice)
+
+    private final String value;
+
+    Credentials(String value) {
+        this.value = value;
+    }
+
+    @Override
+    public String toString() {
+        return value;
+    }
+}

PaymentApp/app/src/main/java/com/shopify/paymentapp/HomeActivity.java

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+package com.shopify.paymentapp;
+
+import android.content.pm.PackageInfo;
+import android.support.v7.app.AppCompatActivity;
+import android.os.Bundle;
+import android.util.Log;
+
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.util.Formatter;
+
+public class HomeActivity extends AppCompatActivity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_home);
+    }
+}

PaymentApp/app/src/main/java/com/shopify/paymentapp/JsonRequest.java

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+package com.shopify.paymentapp;
+
+import com.google.gson.FieldNamingPolicy;
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+
+import org.json.JSONObject;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.OutputStreamWriter;
+import java.net.HttpURLConnection;
+import java.net.URL;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * Created by krystosterone on 2017-06-07.
+ */
+
+public class JsonRequest<T> {
+    private final String url;
+    private final String requestMethod;
+    private final JSONObject payload;
+    private final Map<String, String> requestHeaders;
+
+    public JsonRequest(String url, String requestMethod) {
+        this(url, requestMethod, null, null);
+    }
+
+    public JsonRequest(String url, String requestMethod, JSONObject payload, Map<String, String> requestHeaders) {
+        this.url = url;
+        this.requestMethod = requestMethod;
+        this.payload = payload;
+        this.requestHeaders = requestHeaders;
+    }
+
+    public T execute(Class<T> responseClass) throws IOException {
+        URL url = new URL(this.url);
+        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
+        connection.setRequestMethod(this.requestMethod);
+        connection.setRequestProperty("Content-Type", "application/json");
+
+        if (requestHeaders != null) {
+            for (Map.Entry<String, String> entry : this.requestHeaders.entrySet()) {
+                connection.setRequestProperty(entry.getKey(), entry.getValue());
+            }
+        }
+
+        if (this.payload != null) {
+            OutputStreamWriter writer = new OutputStreamWriter(connection.getOutputStream());
+            writer.write(this.payload.toString());
+            writer.flush();
+        }
+
+        BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
+        StringBuilder stringBuilder = new StringBuilder();
+        String line;
+        while ((line = reader.readLine()) != null) {
+            stringBuilder.append(line + "\n");
+        }
+        reader.close();
+
+        return new Gson().fromJson(stringBuilder.toString(), responseClass);
+    }
+}

PaymentApp/app/src/main/java/com/shopify/paymentapp/Payment.java

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+package com.shopify.paymentapp;
+
+import com.google.gson.Gson;
+import com.google.gson.annotations.Expose;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.OutputStreamWriter;
+import java.net.HttpURLConnection;
+import java.net.URL;
+import java.util.HashMap;
+import java.util.UUID;
+
+/**
+ * Created by krystosterone on 2017-06-02.
+ */
+
+public class Payment {
+    private final UUID uuid;
+    private final String spspEndpoint;
+    private final double totalAmount;
+    private final Quote.Response quoteResponse;
+
+    public Payment(UUID uuid, String spspEndpoint, double totalAmount, Quote.Response quoteResponse) {
+        this.uuid = uuid;
+        this.spspEndpoint = spspEndpoint;
+        this.totalAmount = totalAmount;
+        this.quoteResponse = quoteResponse;
+    }
+
+    // See: https://github.com/interledgerjs/ilp-kit/blob/3079862314f4433e974d14d56b65eafd374fbf5f/api/src/lib/pay.js#L44
+    public Response execute() throws IOException, JSONException {
+        // It this really the way we should resolve the Quoting and Payments API URLs?
+        // Should we have done a webfinger request to get those?
+        // See: https://interledger.org/rfcs/0009-simple-payment-setup-protocol/#appendix-a-optional-webfinger-discovery
+        String url = Credentials.LEDGER_URL + "/api/payments/" + this.uuid;
+
+        JSONObject destination = new JSONObject();
+        // This is not a real spspEndpoint
+        // PaymentRequest is actually passing a destination user address
+        // This is because of how the ilp-kit was implemented
+        destination.put("identifier", this.spspEndpoint);
+
+        JSONObject payload = new JSONObject();
+        payload.put("destination", destination);
+        payload.put("quote", new JSONObject(new Gson().toJson(this.quoteResponse)));
+
+        HashMap<String, String> requestHeaders = new HashMap<String, String>();
+        requestHeaders.put("Authorization", "Basic " + Credentials.LEDGER_AUTH_TOKEN);
+
+        return new JsonRequest<Response>(url, "PUT", payload, requestHeaders).execute(Response.class);
+    }
+
+    public class Response {
+        @Expose
+        public Destination destination;
+
+        @Expose
+        public Quote.Response quote;
+
+        public class Destination {
+            @Expose
+            public String identifier;
+        }
+    }
+}