Fix SAM bridge security

2 files changed, 114 insertions, 0 deletions

diff --git a/src/main/java/ganarchy/friendcode/util/ConfigUtil.java b/src/main/java/ganarchy/friendcode/util/ConfigUtil.java
new file mode 100644
index 0000000..b2d6af2
--- /dev/null
+++ b/src/main/java/ganarchy/friendcode/util/ConfigUtil.java
@@ -0,0 +1,106 @@
+package ganarchy.friendcode.util;
+
+import ganarchy.friendcode.FriendCode;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.OutputStreamWriter;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.Properties;
+
+import static org.apache.commons.lang3.SystemUtils.USER_HOME;
+import static org.apache.commons.lang3.SystemUtils.getEnvironmentVariable;
+
+/**
+ * Config utils.
+ */
+public class ConfigUtil {
+    /**
+     * The message stored in the config. Could probably use some improvement.
+     */
+    private static final String CONFIG_MESSAGE =
+        "This is the friendcode config file."
+            + " It's created when you open your world to a friend code.";
+    /**
+     * The (cached) global friendcode config dir.
+     */
+    private static File confdir;
+
+    /**
+     * Creates and returns the global friendcode config dir.
+     */
+    public static File getGlobalConfig() {
+        if (confdir != null) {
+            return confdir;
+        }
+        var configHome = getEnvironmentVariable("XDG_CONFIG_HOME", "");
+        if (!configHome.isEmpty()) {
+            confdir = Path.of(configHome, "mc_friendcode").toFile();
+        } else {
+            confdir = Path.of(USER_HOME, ".config", "mc_friendcode").toFile();
+        }
+        confdir.mkdirs();
+        return confdir;
+    }
+
+    /**
+     * Returns the path to the global friendcode config file.
+     */
+    public static Path getGlobalConfigFilePath() {
+        return getGlobalConfig().toPath().resolve("config.properties");
+    }
+
+    /**
+     * Retrieves the settings from the global config file and stores them in
+     * the given object.
+     *
+     * @param properties Where to store the read config.
+     * @return Whether reading was successful.
+     */
+    public static boolean getSettings(Properties properties) {
+        try {
+            var inputStream = Files.newInputStream(
+                getGlobalConfigFilePath()
+            );
+            var reader = new InputStreamReader(
+                inputStream, StandardCharsets.UTF_8
+            );
+            properties.load(reader);
+            return true;
+        } catch (IOException e) {
+            return false;
+        }
+    }
+
+    /**
+     * Updates the global config file with the settings in the given object.
+     *
+     * @param properties The settings to add to the config.
+     * @return Whether writing was successful.
+     */
+    public static boolean updateSettings(Properties properties) {
+        var prop = new Properties();
+        if (!getSettings(prop)) {
+            FriendCode.LOGGER.warn(
+                "Couldn't read global config." +
+                    " If it doesn't exist, it will be created."
+            );
+        }
+        prop.putAll(properties);
+        try {
+            var outputStream = Files.newOutputStream(
+                getGlobalConfigFilePath()
+            );
+            var writer = new OutputStreamWriter(
+                outputStream, StandardCharsets.UTF_8
+            );
+            prop.store(writer, CONFIG_MESSAGE);
+            return true;
+        } catch (IOException e) {
+            return false;
+        }
+    }
+}
diff --git a/src/main/java/ganarchy/friendcode/util/KeyUtil.java b/src/main/java/ganarchy/friendcode/util/KeyUtil.java
index cc6396c..e8e07e5 100644
--- a/src/main/java/ganarchy/friendcode/util/KeyUtil.java
+++ b/src/main/java/ganarchy/friendcode/util/KeyUtil.java
@@ -1,7 +1,15 @@
 package ganarchy.friendcode.util;
 
+import java.nio.file.Path;
+
 /**
 * Helper to deal with private keys.
 */
 public class KeyUtil {
+    public static String readKeyFile(Path keyFile) {
+        return null;
+    }
+    public static boolean writeKeyFile(Path keyFile, String key) {
+        return false;
+    }
 }