Merge branch 'fix-bundle-path-detection-sierra'

Fix Downloads folder detection on macOS > Sierra

See potionfactory#60

Relevant:
* https://opensource.apple.com/source/Security/Security-57740.51.3/OSX/libsecurity_translocate/lib/SecTranslocate.h.auto.html
* https://lapcatsoftware.com/articles/detect-app-translocation.html

PFMoveApplication.m

@@ -49,6 +49,7 @@ + (NSBundle *)bundle {
 static BOOL MoveInProgress = NO;
 
 // Helper functions
+static NSURL * GetOriginalBundleURL(void);
 static NSString *PreferredInstallLocation(BOOL *isUserDirectory);
 static BOOL IsInApplicationsFolder(NSString *path);
 static BOOL IsInDownloadsFolder(NSString *path);
@@ -78,7 +79,7 @@ void PFMoveToApplicationsFolderIfNecessary(void) {
 	if ([[NSUserDefaults standardUserDefaults] boolForKey:AlertSuppressKey]) return;
 
 	// Path of the bundle
-	NSString *bundlePath = [[NSBundle mainBundle] bundlePath];
+	NSString *bundlePath = GetOriginalBundleURL().path;
 
 	// Check if the bundle is embedded in another application
 	BOOL isNestedApplication = IsApplicationAtPathNested(bundlePath);
@@ -239,6 +240,56 @@ BOOL PFMoveIsInProgress() {
 #pragma mark -
 #pragma mark Helper Functions
 
+/// Gets the real bundle path of the application, not the Translocated one if applicable
+static NSURL * GetOriginalBundleURL(void) {
+
+	NSURL * bundleURL = [NSBundle mainBundle].bundleURL;
+	NSLog(@"%s: Foundation says bundle URL is %@", __FUNCTION__, bundleURL);
+
+	// #define NSAppKitVersionNumber10_11 1404
+	if (floor(NSAppKitVersionNumber) <= 1404) {
+		return bundleURL;
+	}
+
+	void * handle = dlopen("/System/Library/Frameworks/Security.framework/Security", RTLD_LAZY);
+	if (handle == NULL) {
+		return bundleURL;
+	}
+
+	bool isTranslocated = false;
+
+	// Get (undocumented?) function symbols for looking up app translocation info
+	// Note: <Security/SecTranslocation.h> was available in the macOS 10.12 beta SDKs but seems to have been removed as of Xcode 8.1
+	// see https://opensource.apple.com/source/Security/Security-58286.70.7/OSX/libsecurity_translocate/lib/SecTranslocate.h.auto.html
+
+	typedef Boolean (*SecTranslocateIsTranslocatedURL_t)(CFURLRef path, bool *isTranslocated, CFErrorRef * __nullable error);
+	SecTranslocateIsTranslocatedURL_t mySecTranslocateIsTranslocatedURL = (SecTranslocateIsTranslocatedURL_t)dlsym(handle, "SecTranslocateIsTranslocatedURL");
+
+	typedef CFURLRef __nullable(*SecTranslocateCreateOriginalPathForURL_t)(CFURLRef translocatedPath, CFErrorRef * __nullable error);
+	SecTranslocateCreateOriginalPathForURL_t mySecTranslocateCreateOriginalPathForURL = (SecTranslocateCreateOriginalPathForURL_t)dlsym(handle, "SecTranslocateCreateOriginalPathForURL");
+
+	dlclose(handle);
+
+	if (mySecTranslocateIsTranslocatedURL == NULL || mySecTranslocateCreateOriginalPathForURL == NULL) {
+		NSLog(@"%s: We're running on macOS >= 10.12 but the SecTranslocate functions are not available", __FUNCTION__);
+		return bundleURL;
+	}
+
+	if (mySecTranslocateIsTranslocatedURL((__bridge CFURLRef)bundleURL, &isTranslocated, NULL) && isTranslocated)
+	{
+		CFURLRef originalURL = mySecTranslocateCreateOriginalPathForURL((__bridge CFURLRef)bundleURL, NULL);
+		if (originalURL != NULL)
+		{
+			NSURL * result = CFBridgingRelease(originalURL);
+			NSLog(@"%s: Security says bundle is Translocated from %@", __FUNCTION__, result);
+			return result;
+		}
+	}
+
+	NSLog(@"%s: Translocation not in effect", __FUNCTION__);
+	return bundleURL;
+}
+
 static NSString *PreferredInstallLocation(BOOL *isUserDirectory) {
 	// Return the preferred install location.
 	// Assume that if the user has a ~/Applications folder, they'd prefer their