commit initial version of PieCannon library and desktop app.

Documentation is sparse right now, I'm working on getting the desktop and android apps working first.

desktop/src/main/java/net/monarchpass/piecannon/App.java

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+package net.monarchpass.piecannon;
+
+import java.net.URI;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.FileInputStream;
+import java.io.InputStreamReader;
+
+import java.util.Collections;
+import java.util.Random;
+import java.util.List;
+import java.util.ArrayList;
+import java.util.stream.Collectors;
+
+import org.freedesktop.BaseDirectory;
+
+import com.google.common.collect.Streams;
+
+import com.google.gson.JsonArray;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParser;
+
+import lombok.extern.java.Log;
+import java.util.logging.Level;
+
+@Log
+public class App {
+    public static void main (final String... args) throws Exception {
+        final File serversJson = getServersJson();
+        final List<Server> servers = loadServersFrom(serversJson);
+        log.log(Level.INFO, "{0} servers loaded from {1}", new Object[] {
+            servers.size(), serversJson
+        });
+        
+        if (servers.isEmpty()) {
+            log.log(Level.SEVERE, "No servers defined, please define at least one in {0}", serversJson);
+            System.exit(1);
+        }
+        
+        final Server server = servers.get(new Random().nextInt(servers.size()));
+        log.log(Level.INFO, "Randomly selected server: {0}", server.getLabel());
+        
+        if (args.length == 0) {
+            log.log(Level.SEVERE, "No filename provided");
+            System.exit(1);
+        }
+        
+        final File source = new File(args[0]);
+        if (!source.exists()) {
+            log.log(Level.SEVERE, "No such file: {0}", source);
+            System.exit(1);
+        }
+        
+        final URI result = server.upload(source);
+        System.out.println(result);
+    }
+    
+    public static List<Server> loadServersFrom (final File serversJson) throws IOException {
+        if (!serversJson.exists()) {
+            return Collections.EMPTY_LIST;
+        }
+        
+        final ServerFactory factory = new ServerFactory();
+        try (final InputStream in = new FileInputStream(serversJson)) {
+            final JsonParser parser = new JsonParser();
+            return Streams.stream(parser.parse(new InputStreamReader(in)).getAsJsonArray())
+                .filter(JsonElement::isJsonObject)
+                .map(JsonObject.class::cast)
+                .map(factory)
+                .collect(Collectors.toList());
+        }
+    }
+    
+    public static File getServersJson () {
+        return new File(getDataDirectory(), "servers.json");
+    }
+    
+    public static File getDataDirectory () {
+        return new File(BaseDirectory.get(BaseDirectory.XDG_DATA_HOME), "piecannon");
+    }
+}

desktop/src/main/java/net/monarchpass/piecannon/ServerFactory.java

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+package net.monarchpass.piecannon;
+
+import java.net.URI;
+
+import java.util.function.Function;
+
+import com.google.gson.JsonObject;
+import net.monarchpass.piecannon.impl.SftpServer;
+
+import com.google.common.base.MoreObjects;
+
+public class ServerFactory implements Function<JsonObject, Server> {
+    public Server apply (final JsonObject object) {
+        return makeSftpServer(object);
+    }
+    
+    private Server makeSftpServer (final JsonObject object) {
+        final String host = object.getAsJsonPrimitive("host").getAsString();
+        final String label = object.has("label") ? object.getAsJsonPrimitive("label").getAsString() : host;
+        final int port = object.has("port") ? object.getAsJsonPrimitive("port").getAsInt() : 22;
+        final String username = object.getAsJsonPrimitive("username").getAsString();
+        final String password = object.getAsJsonPrimitive("password").getAsString();
+        final String path = object.getAsJsonPrimitive("path").getAsString();
+        final String url = object.getAsJsonPrimitive("url").getAsString();
+        
+        return new SftpServer(
+            label, host, port, username, password,
+            path, URI.create(url)
+        );
+    }
+}

desktop/src/test/java/net/monarchpass/piecannon/AppTest.java

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+package net.monarchpass.piecannon;
+
+import org.junit.jupiter.api.Test;
+
+import static com.google.common.truth.Truth.assertThat;
+
+public class AppTest {
+    @Test
+    public void test () throws Exception {}
+}