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.

lib/src/main/java/net/monarchpass/piecannon/PieCannon.java

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+package net.monarchpass.piecannon;
+
+import java.net.URI;
+
+import java.io.InputStream;
+import java.io.IOException;
+
+import java.util.List;
+import java.util.ArrayList;
+import java.util.Collections;
+
+import com.google.common.base.Charsets;
+import com.google.common.io.CharSource;
+import com.google.common.io.ByteStreams;
+
+public class PieCannon {
+    private final List<Server> servers = new ArrayList<>();
+    
+    public void addServer (final Server server) {
+        servers.add(server);
+    }
+    
+    public List<Server> getServers () {
+        return Collections.unmodifiableList(servers);
+    }
+    
+    public static boolean testServer (final Server server) {
+        final String testString = "piecannon-test-" + System.currentTimeMillis();
+        final URI result = server.upload("piecannon.test", CharSource.wrap(testString).asByteSource(Charsets.UTF_8));
+        
+        try (final InputStream in = result.toURL().openStream()) {
+            return new String(ByteStreams.toByteArray(in), Charsets.UTF_8).equals(testString);
+        } catch (final IOException exception) {
+            exception.printStackTrace();
+        }
+        
+        return false;
+    }
+}

lib/src/main/java/net/monarchpass/piecannon/Server.java

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+package net.monarchpass.piecannon;
+
+import java.io.File;
+import java.net.URI;
+import com.google.common.io.Files;
+import com.google.common.io.ByteSource;
+
+public interface Server {
+    public String getLabel ();
+    public URI upload (String name, ByteSource source);
+    public default URI upload (File file) {return upload(file.getName(), Files.asByteSource(file));}
+}

lib/src/main/java/net/monarchpass/piecannon/impl/SftpServer.java

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+package net.monarchpass.piecannon.impl;
+
+import net.monarchpass.piecannon.Server;
+import com.google.common.io.ByteSource;
+
+import java.io.InputStream;
+import java.io.IOException;
+import java.net.URI;
+
+import com.jcraft.jsch.JSch;
+import com.jcraft.jsch.Session;
+import com.jcraft.jsch.Channel;
+import com.jcraft.jsch.ChannelSftp;
+import com.jcraft.jsch.JSchException;
+import com.jcraft.jsch.SftpException;
+
+import lombok.Data;
+
+@Data
+public class SftpServer implements Server {
+    private final String label;
+    private final String host;
+    private final int port;
+    private final String username;
+    private final String password;
+    private final String path;
+    private final URI uri;
+    
+    public URI upload (String name, ByteSource source) {
+        try {
+            final JSch jsch = new JSch();
+            final Session session = jsch.getSession(username, host, port);
+            session.setPassword(password);
+            session.setConfig("StrictHostKeyChecking", "no");
+            session.connect();
+
+            final Channel channel = session.openChannel("sftp");
+            channel.connect();
+            
+            final ChannelSftp sftp = (ChannelSftp) channel;
+            sftp.cd(path);
+            
+            try (InputStream in = source.openStream()) {
+                sftp.put(in, name);
+            }
+            
+            session.disconnect();
+            return URI.create(uri.toString() + "/" + name);
+        } catch (final JSchException | IOException | SftpException exception) {
+            throw new RuntimeException(exception);
+        }
+    }
+}

lib/src/test/java/net/monarchpass/piecannon/SftpTest.java

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+package net.monarchpass.piecannon;
+
+import java.net.URI;
+import org.junit.jupiter.api.Test;
+import net.monarchpass.piecannon.impl.SftpServer;
+
+import static com.google.common.truth.Truth.assertThat;
+
+public class SftpTest {
+    @Test
+    public void test () throws Exception {
+        final String testServerHost = System.getProperty("piecannon.test.host");
+        if (testServerHost == null) {
+            return;
+        }
+        
+        final String testServerUser = System.getProperty("piecannon.test.user");
+        final String testServerPassword = System.getProperty("piecannon.test.password");
+        final String testServerPath = System.getProperty("piecannon.test.path");
+        final String testServerURL = System.getProperty("piecannon.test.url");
+        
+        final Server server = new SftpServer(
+            "Test Server Instance", testServerHost, 22,
+            testServerUser, testServerPassword, testServerPath,
+            URI.create(testServerURL)
+        );
+        
+        assertThat(PieCannon.testServer(server)).isTrue();
+    }
+}