System Touch

Author: mearvk

source/admin/ModuleAdmin.java

@@ -0,0 +1,68 @@
+package admin;
+
+import commons.CommonRails;
+
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+
+/**
+ * Basic administrator for ModuleInstallationService.
+ * Admin credentials are loaded from the system property or env:
+ *   module.admin.password  /  MODULE_ADMIN_PASSWORD
+ * Defaults to "n21admin" if neither is set.
+ *
+ * An authenticated session token is stored in SESSIONS for the lifetime
+ * of the TCP connection.
+ */
+public class ModuleAdmin
+{
+    private static final String PASSWORD = resolvePassword();
+
+    /** Active session tokens — keyed by token string, value = nationalId of admin. */
+    private static final ConcurrentHashMap<String, Long> SESSIONS = new ConcurrentHashMap<>();
+
+    /**
+     * Attempt login.  Returns a session token on success, null on failure.
+     */
+    public static String login(final String SUBMITTED_PASSWORD, final long NATIONAL_ID)
+    {
+        if (SUBMITTED_PASSWORD == null || !SUBMITTED_PASSWORD.equals(PASSWORD))
+        {
+            CommonRails.printSystemComponent(
+                new ModuleAdmin(), ModuleAdmin.class.hashCode(),
+                ". ModuleAdmin login FAILED for National ID " + NATIONAL_ID + " .");
+            return null;
+        }
+        String token = Long.toHexString(System.nanoTime()) + Long.toHexString(NATIONAL_ID);
+        SESSIONS.put(token, NATIONAL_ID);
+        CommonRails.printSystemComponent(
+            new ModuleAdmin(), ModuleAdmin.class.hashCode(),
+            ". ModuleAdmin login SUCCESS for National ID " + NATIONAL_ID + " .");
+        return token;
+    }
+
+    /** Returns true if the token belongs to an authenticated admin session. */
+    public static boolean isAdmin(final String TOKEN)
+    {
+        return TOKEN != null && SESSIONS.containsKey(TOKEN);
+    }
+
+    /** Invalidate a session token on logout/disconnect. */
+    public static void logout(final String TOKEN)
+    {
+        Long id = SESSIONS.remove(TOKEN);
+        if (id != null)
+            CommonRails.printSystemComponent(
+                new ModuleAdmin(), ModuleAdmin.class.hashCode(),
+                ". ModuleAdmin session ended for National ID " + id + " .");
+    }
+
+    private static String resolvePassword()
+    {
+        String prop = System.getProperty("module.admin.password");
+        if (prop != null && !prop.isEmpty()) return prop;
+        String env = System.getenv("MODULE_ADMIN_PASSWORD");
+        if (env != null && !env.isEmpty()) return env;
+        return "n21admin";
+    }
+}