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Supporting DexGuard obfuscation tool #143

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Supporting DexGuard obfuscation tool #143

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85 changes: 57 additions & 28 deletions card.io/src/main/java/io/card/payment/CardScanner.java
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Original file line number Diff line number Diff line change
Expand Up @@ -115,32 +115,69 @@ private native void nScanFrame(byte[] data, int frameWidth, int frameHeight, int

// ------------------------------------------------------------------------
// STATIC INITIALIZATION
//
// Loading native libraries.
// No checks are performed to ensure that the native libraries match the cardIO library version.
// This needs to be handled by the consuming application.
// ------------------------------------------------------------------------

static {
Log.i(Util.PUBLIC_LOG_TAG, "card.io " + BuildConfig.PRODUCT_VERSION + " " + BuildConfig.BUILD_TIME);

try {
loadLibrary("cardioDecider");
// Need to load each library directly with System.loadLibrary() and with parameter as String literal
// or constant. Otherwise DexGuard will remove the native libraries (.so files).
final String CARDIO_DECIDER = "cardioDecider";
try {
System.loadLibrary(CARDIO_DECIDER);
} catch (UnsatisfiedLinkError e) {
loadWithAlternativeLibsPath(CARDIO_DECIDER, e);
}
Log.d(Util.PUBLIC_LOG_TAG, "Loaded card.io decider library.");
Log.d(Util.PUBLIC_LOG_TAG, " nUseNeon(): " + nUseNeon());
Log.d(Util.PUBLIC_LOG_TAG, " nUseTegra():" + nUseTegra());
Log.d(Util.PUBLIC_LOG_TAG, " nUseX86(): " + nUseX86());

if (usesSupportedProcessorArch()) {
loadLibrary("opencv_core");
final String OPENCV_CORE = "opencv_core";
try {
System.loadLibrary(OPENCV_CORE);
} catch (UnsatisfiedLinkError e) {
loadWithAlternativeLibsPath(OPENCV_CORE, e);
}
Log.d(Util.PUBLIC_LOG_TAG, "Loaded opencv core library");
loadLibrary("opencv_imgproc");

final String OPENCV_IMGPROC = "opencv_imgproc";
try {
System.loadLibrary(OPENCV_IMGPROC);
} catch (UnsatisfiedLinkError e) {
loadWithAlternativeLibsPath(OPENCV_IMGPROC, e);
}
Log.d(Util.PUBLIC_LOG_TAG, "Loaded opencv imgproc library");
}

final String CARDIO_RECOGNIZER = "cardioRecognizer";
if (nUseNeon()) {
loadLibrary("cardioRecognizer");
try {
System.loadLibrary(CARDIO_RECOGNIZER);
} catch (UnsatisfiedLinkError e) {
loadWithAlternativeLibsPath(CARDIO_RECOGNIZER, e);
}
Log.i(Util.PUBLIC_LOG_TAG, "Loaded card.io NEON library");
} else if (nUseX86()) {
loadLibrary("cardioRecognizer");
try {
System.loadLibrary(CARDIO_RECOGNIZER);
} catch (UnsatisfiedLinkError e) {
loadWithAlternativeLibsPath(CARDIO_RECOGNIZER, e);
}
Log.i(Util.PUBLIC_LOG_TAG, "Loaded card.io x86 library");
} else if (nUseTegra()) {
loadLibrary("cardioRecognizer_tegra2");
final String CARDIO_RECOGNIZER_TEGRA2 = "cardioRecognizer_tegra2";
try {
System.loadLibrary(CARDIO_RECOGNIZER_TEGRA2);
} catch (UnsatisfiedLinkError e) {
loadWithAlternativeLibsPath(CARDIO_RECOGNIZER_TEGRA2, e);
}
Log.i(Util.PUBLIC_LOG_TAG, "Loaded card.io Tegra2 library");
} else {
Log.w(Util.PUBLIC_LOG_TAG,
Expand All @@ -155,30 +192,22 @@ private native void nScanFrame(byte[] data, int frameWidth, int frameHeight, int
}

/**
* Custom loadLibrary method that first tries to load the libraries from the built-in libs
* directory and if it fails, tries to use the alternative libs path if one is set.
*
* No checks are performed to ensure that the native libraries match the cardIO library version.
* This needs to be handled by the consuming application.
* Tries to use the alternative libs path if one is set, to load a library.
*/
private static void loadLibrary(String libraryName) throws UnsatisfiedLinkError {
try {
System.loadLibrary(libraryName);
} catch (UnsatisfiedLinkError e) {
String altLibsPath = CardIONativeLibsConfig.getAlternativeLibsPath();
if (altLibsPath == null || altLibsPath.length() == 0) {
throw e;
}
if (!File.separator.equals(altLibsPath.charAt(altLibsPath.length() - 1))) {
altLibsPath += File.separator;
}
String fullPath = altLibsPath + Build.CPU_ABI + File.separator +
System.mapLibraryName(libraryName);
Log.d(Util.PUBLIC_LOG_TAG, "loadLibrary failed for library " + libraryName + ". Trying " + fullPath);
// If we couldn't find the library in the normal places and we have an additional
// search path, try loading from there.
System.load(fullPath);
private static void loadWithAlternativeLibsPath(String libraryName, UnsatisfiedLinkError e) throws UnsatisfiedLinkError {
String altLibsPath = CardIONativeLibsConfig.getAlternativeLibsPath();
if (altLibsPath == null || altLibsPath.length() == 0) {
throw e;
}
if (!File.separator.equals(altLibsPath.charAt(altLibsPath.length() - 1))) {
altLibsPath += File.separator;
}
String fullPath = altLibsPath + Build.CPU_ABI + File.separator +
System.mapLibraryName(libraryName);
Log.d(Util.PUBLIC_LOG_TAG, "loadLibrary failed for library " + libraryName + ". Trying " + fullPath);
// If we couldn't find the library in the normal places and we have an additional
// search path, try loading from there.
System.load(fullPath);
}

private static boolean usesSupportedProcessorArch() {
Expand Down