master

java/FuckingCoffee.java

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+import java.io.BufferedReader;
+import java.io.InputStreamReader;
+import java.io.PrintWriter;
+import java.net.Socket;
+import java.util.concurrent.TimeUnit;
+import java.util.stream.Collectors;
+
+public class FuckingCoffee {
+
+    private static final String PASSWORD_PROMPT = "Password: ";
+    private static final String PASSWORD = "1234";
+    private static final String COFFEE_MACHINE_IP = "10.10.42.42";
+    private static final long DELAY_BEFORE_BREW = TimeUnit.SECONDS.toMillis(17);
+    private static final long DELAY = TimeUnit.SECONDS.toMillis(24);
+
+    public static void main(String... args) throws Exception {
+        try (BufferedReader buffer = new BufferedReader(
+                new InputStreamReader(Runtime.getRuntime().exec("who -q").getInputStream())
+        )) {
+            String whoOutput = buffer.lines().collect(Collectors.joining(System.lineSeparator()));
+            if (!whoOutput.contains(System.getProperty("user.name"))) {
+                return;
+            }
+        }
+
+        try (Socket telnet = new Socket(COFFEE_MACHINE_IP, 23);
+             BufferedReader in = new BufferedReader(new InputStreamReader(telnet.getInputStream()));
+             PrintWriter out = new PrintWriter(telnet.getOutputStream(), true)
+        ) {
+            Thread.sleep(DELAY_BEFORE_BREW);
+            if (!PASSWORD_PROMPT.equals(in.readLine())) {
+                return;
+            }
+            out.println(PASSWORD);
+            out.println("sys brew");
+            Thread.sleep(DELAY);
+            out.println("sys pour");
+        }
+
+    }
+}