From 0c617976918d22e5a3d2433bd70ff21807522381 Mon Sep 17 00:00:00 2001
From: falkTX <falktx@falktx.com>
Date: Tue, 6 Feb 2024 15:07:42 +0100
Subject: [PATCH] Initial code for generating uid

Signed-off-by: falkTX <falktx@falktx.com>
---
 src/systray/utils.cpp          | 43 ++++++++++++++++++++++++++++++++++
 utils/cxfreeze/mod-ui-setup.py |  5 ----
 2 files changed, 43 insertions(+), 5 deletions(-)

diff --git a/src/systray/utils.cpp b/src/systray/utils.cpp
index 74dbdfb..62a9047 100644
--- a/src/systray/utils.cpp
+++ b/src/systray/utils.cpp
@@ -16,6 +16,7 @@
 #define PRE_20H1_DWMWA_USE_IMMERSIVE_DARK_MODE 19
 #define DWMWA_USE_IMMERSIVE_DARK_MODE 20
 #else
+#include <QtCore/QMessageAuthenticationCode>
 #include <QtCore/QStandardPaths>
 #include <dlfcn.h>
 #include <pwd.h>
@@ -32,6 +33,17 @@
 #include <linux/limits.h>
 #endif
 
+constexpr const uint8_t mod_desktop_hash[] = {
+    0xe4, 0xf7, 0x0d, 0xe9, 0x77, 0xb8, 0x47, 0xe0, 0xba, 0x2e, 0x70, 0x14, 0x93, 0x7a, 0xce, 0xa7
+};
+
+constexpr uint8_t char2u8(const uint8_t c)
+{
+    return c >= '0' && c <= '9' ? c - '0'
+        : c >= 'a' && c <= 'f' ? 0xa + c - 'a'
+        : 0;
+}
+
 void initEvironment()
 {
     // base environment details
@@ -126,6 +138,37 @@ void initEvironment()
     const size_t dataDirLen = std::strlen(dataDir);
    #endif
 
+    // generate UID
+   #if defined(__APPLE__)
+    // TODO
+   #elif defined(_WIN32)
+    // TODO
+   #else
+    if (FILE* const f = fopen("/etc/machine-id", "r"))
+    {
+        size_t len;
+        if (fread(path, PATH_MAX - 1, 1, f) == 0 && (len = strlen(path)) >= 33)
+        {
+            uint8_t idkey[16];
+            for (int i=0; i<16; ++i)
+            {
+                idkey[i] = char2u8(path[i*2]) << 4;
+                idkey[i] |= char2u8(path[i*2+1]) << 0;
+            }
+
+            QMessageAuthenticationCode qhash(QCryptographicHash::Sha256);
+            qhash.setKey(QByteArray::fromRawData(reinterpret_cast<const char*>(idkey), sizeof(idkey)));
+            qhash.addData(reinterpret_cast<const char*>(mod_desktop_hash), sizeof(mod_desktop_hash));
+
+            QByteArray qresult(qhash.result().toHex(':').toUpper());
+            qresult.truncate(32 + 15);
+
+            setenv("MOD_DEVICE_UID", qresult.constData(), 1);
+        }
+        fclose(f);
+    }
+   #endif
+
     // set path to factory pedalboards
   #ifdef _WIN32
     std::memcpy(path, appDir, appDirLen * sizeof(WCHAR));
diff --git a/utils/cxfreeze/mod-ui-setup.py b/utils/cxfreeze/mod-ui-setup.py
index f57f8e7..0bba05d 100644
--- a/utils/cxfreeze/mod-ui-setup.py
+++ b/utils/cxfreeze/mod-ui-setup.py
@@ -67,7 +67,6 @@ def makedirs(path: str):
 #os.environ['MOD_API_KEY'] = os.path.join(resdir, '..', 'mod_api_key.pub')
 os.environ['MOD_DEVICE_KEY'] = os.path.join(DEVICE_DIR, 'rsa')
 os.environ['MOD_DEVICE_TAG'] = os.path.join(DEVICE_DIR, 'tag')
-os.environ['MOD_DEVICE_UID'] = os.path.join(DEVICE_DIR, 'uid')
 
 from datetime import datetime
 from random import randint
@@ -77,10 +76,6 @@ def makedirs(path: str):
         with open(os.environ['MOD_DEVICE_TAG'], 'w') as fh:
             tag = 'MDS-{0}-0-00-000-{1}'.format(datetime.utcnow().strftime('%Y%m%d'), randint(9000, 9999))
             fh.write(tag)
-    if not os.path.isfile(os.environ['MOD_DEVICE_UID']):
-        with open(os.environ['MOD_DEVICE_UID'], 'w') as fh:
-            uid = ':'.join(['{0}{1}'.format(randint(0, 9), randint(0, 9)) for i in range(0, 16)])
-            fh.write(uid)
     if not os.path.isfile(os.environ['MOD_DEVICE_KEY']):
         try:
             key = RSA.generate(2048)