E2-1227 Excluding database from iCloud/iTunes sync (#325)

* E2-1227 Excluding database from iCloud/iTunes sync

* Adding test case

* Adding test case, fixing formatting

Author: milos1290

Example/Tests/Classes/LPFileManagerTest.m

@@ -241,4 +241,26 @@ - (void)test_nullability
     XCTAssertNil(result);
 }
 
+- (void)test_addSkipBackupAttribute
+{
+    NSString *path = nil;
+    XCTAssertFalse([LPFileManager addSkipBackupAttributeToItemAtPath:path]);
+
+    // Creates a sample file in directory for test.
+    NSString *cacheDirectory = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
+                                                                   NSUserDomainMask, YES)[0];
+
+    NSData *test_data = [@"sample data" dataUsingEncoding:NSUTF8StringEncoding];
+    path = [cacheDirectory stringByAppendingPathComponent:@"sample.txt"];
+    [test_data writeToFile:path atomically:YES];
+
+    XCTAssertTrue([LPFileManager addSkipBackupAttributeToItemAtPath:path]);
+
+    NSURL* url = [NSURL fileURLWithPath:path];
+    NSNumber* excluded = [NSNumber new];
+    [url getResourceValue:&excluded forKey:NSURLIsExcludedFromBackupKey error:nil];
+
+    XCTAssertEqual([excluded boolValue], YES);
+}
+
 @end

Leanplum-SDK/Classes/Managers/LPFileManager.h

@@ -77,4 +77,9 @@
          current:(NSString *__nonnull)relativeDir
            files:(NSMutableArray *__nonnull)files;
 
+/**
+ * Adds an attribute to a file at filepath to exclude it from iCloud and iTunes backup.
+ */
++ (BOOL)addSkipBackupAttributeToItemAtPath:(NSString *__nonnull) filePathString;
+
 @end

Leanplum-SDK/Classes/Managers/LPFileManager.m

@@ -834,4 +834,26 @@ + (void)enableResourceSyncingWithInclusions:(NSArray *)inclusions
     }
 }
 
++ (BOOL)addSkipBackupAttributeToItemAtPath:(NSString *) filePathString
+{
+    LP_TRY
+    if (!filePathString) {
+        return NO;
+    }
+
+    NSURL* url= [NSURL fileURLWithPath:filePathString];
+    if (url && [[NSFileManager defaultManager] fileExistsAtPath:[url path]]) {
+        NSError *error = nil;
+        BOOL success = [url setResourceValue:[NSNumber numberWithBool: YES]
+                                      forKey:NSURLIsExcludedFromBackupKey
+                                       error:&error];
+        if (!success) {
+            NSLog(@"Leanplum: Error excluding %@ from backup %@", [url lastPathComponent], error);
+        }
+        return success;
+    }
+    return NO;
+    LP_END_TRY
+}
+
 @end

Leanplum-SDK/Classes/Utilities/LPDatabase.m

@@ -55,6 +55,15 @@ - (sqlite3 *)initSQLite
         [self handleSQLiteError:@"SQLite fail to open" errorResult:result query:nil];
         return nil;
     }
+
+    if (result == SQLITE_OK) {
+        if ([LPFileManager addSkipBackupAttributeToItemAtPath:[LPDatabase sqliteFilePath]]) {
+            NSLog(@"Leanplum: Successfully excluded database from syncing.");
+        } else {
+            NSLog(@"Leanplum: Unable to exclude database from syncing.");
+        }
+    }
+
     retryOnCorrupt = NO;
 
     // Create tables.