chore: tweak code

Author: zapcannon87

AVOS/Sources/Foundation/LCApplication.h

@@ -166,7 +166,7 @@ NS_ASSUME_NONNULL_BEGIN
 
 @property (nonatomic, readonly) NSString *identifier;
 @property (nonatomic, readonly) NSString *key;
-@property (nonatomic, readonly) NSString *serverURLString;
+@property (nonatomic, readonly, nullable) NSString *serverURLString;
 @property (nonatomic, copy, nullable) NSString *RTMServer;
 
 - (void)setWithIdentifier:(NSString *)identifier key:(NSString *)key;

AVOS/Sources/Foundation/LCApplication.m

@@ -193,20 +193,28 @@ - (void)setWithIdentifier:(NSString *)identifier key:(NSString *)key {
     _key = [key copy];
 }
 
+- (NSString *)identifier {
+    return [self identifierThrowException];
+}
+
+- (NSString *)key {
+    return [self keyThrowException];
+}
+
 - (NSString *)identifierThrowException {
-    if (!self.identifier) {
+    if (!_identifier || _identifier.length == 0) {
         [NSException raise:NSInternalInconsistencyException
                     format:@"Application identifier not found."];
     }
-    return self.identifier;
+    return _identifier;
 }
 
 - (NSString *)keyThrowException {
-    if (!self.key) {
+    if (!_key || _key.length == 0) {
         [NSException raise:NSInternalInconsistencyException
                     format:@"Application key not found."];
     }
-    return self.key;
+    return _key;
 }
 
 @end

AVOS/Sources/Foundation/LCApplication_Internal.h

@@ -10,6 +10,9 @@
 
 @interface LCApplication ()
 
+@property (nonatomic) NSString *identifier;
+@property (nonatomic) NSString *key;
+
 - (NSString *)identifierThrowException;
 - (NSString *)keyThrowException;
 

AVOS/Sources/Foundation/Router/LCRouter.m

@@ -30,7 +30,7 @@ + (NSString *)serverURLString {
 }
 
 + (void)setServerURLString:(NSString *)URLString {
-    serverURLString = URLString;
+    serverURLString = [URLString copy];
 }
 
 + (instancetype)sharedInstance