Implement XAP 'secure' core requirements (#16843)

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Stefan Kerkmann <karlk90@pm.me>

quantum/process_keycode/process_secure.c

@@ -0,0 +1,39 @@
+// Copyright 2022 QMK
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "secure.h"
+#include "process_secure.h"
+#include "quantum_keycodes.h"
+
+bool preprocess_secure(uint16_t keycode, keyrecord_t *record) {
+    if (secure_is_unlocking()) {
+        if (!record->event.pressed) {
+            secure_keypress_event(record->event.key.row, record->event.key.col);
+        }
+
+        // Normal keypresses should be disabled until the sequence is completed
+        return false;
+    }
+
+    return true;
+}
+
+bool process_secure(uint16_t keycode, keyrecord_t *record) {
+#ifndef SECURE_DISABLE_KEYCODES
+    if (!record->event.pressed) {
+        if (keycode == SECURE_LOCK) {
+            secure_lock();
+            return false;
+        }
+        if (keycode == SECURE_UNLOCK) {
+            secure_unlock();
+            return false;
+        }
+        if (keycode == SECURE_TOGGLE) {
+            secure_is_locked() ? secure_unlock() : secure_lock();
+            return false;
+        }
+    }
+#endif
+    return true;
+}

quantum/process_keycode/process_secure.h

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+// Copyright 2022 QMK
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <stdbool.h>
+#include "action.h"
+
+/** \brief Intercept keycodes and detect unlock sequences
+ */
+bool preprocess_secure(uint16_t keycode, keyrecord_t *record);
+
+/** \brief Handle any secure specific keycodes
+ */
+bool process_secure(uint16_t keycode, keyrecord_t *record);