Added a constant-time aboslutePath-method, and separated Auxiliary and Important-storages on iOS by the cunning use of folders.

Author: Preben Ludviksen

android/src/main/java/com/benwixen/rnfilesystem/RNFileSystem.java

@@ -10,6 +10,8 @@
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.OutputStreamWriter;
+import java.util.HashMap;
+import java.util.Map;
 import java.util.Scanner;
 
 public class RNFileSystem extends ReactContextBaseJavaModule {
@@ -25,6 +27,16 @@ public enum Storage {
     TEMPORARY
   }
 
+  @Override
+  public Map<String, Object> getConstants() {
+    final Map<String, Object> constants = new HashMap<>();
+    constants.put(Storage.BACKED_UP.toString(), baseDirForStorage(Storage.BACKED_UP));
+    constants.put(Storage.IMPORTANT.toString(), baseDirForStorage(Storage.IMPORTANT));
+    constants.put(Storage.AUXILIARY.toString(), baseDirForStorage(Storage.AUXILIARY));
+    constants.put(Storage.TEMPORARY.toString(), baseDirForStorage(Storage.TEMPORARY));
+    return constants;
+  }
+
   @Override
   public String getName() {
     return "RNFileSystem";

ios/RNFileSystem/RNFileSystem.m

@@ -7,12 +7,24 @@
 
 @implementation RNFileSystem
 
+- (NSDictionary<NSString *, NSString *> *)constantsToExport {
+  return @{STORAGE_BACKED_UP: [[RNFileSystem baseDirForStorage:STORAGE_BACKED_UP] path],
+           STORAGE_IMPORTANT: [[RNFileSystem baseDirForStorage:STORAGE_IMPORTANT] path],
+           STORAGE_AUXILIARY: [[RNFileSystem baseDirForStorage:STORAGE_AUXILIARY] path],
+           STORAGE_TEMPORARY: [[RNFileSystem baseDirForStorage:STORAGE_TEMPORARY] path]};
+}
+
+
 + (NSURL*)baseDirForStorage:(NSString*)storage {
   NSFileManager *fileManager = [NSFileManager defaultManager];
   if ([storage isEqual:STORAGE_BACKED_UP]) {
     return [fileManager URLForDirectory:NSDocumentDirectory inDomain:NSUserDomainMask appropriateForURL:nil create:YES error:nil];
-  } else if ([storage isEqual:STORAGE_IMPORTANT] || [storage isEqual:STORAGE_AUXILIARY]) {
-    return [fileManager URLForDirectory:NSCachesDirectory inDomain:NSUserDomainMask appropriateForURL:nil create:YES error:nil];
+  } else if ([storage isEqual:STORAGE_IMPORTANT]) {
+    NSURL *cachesDir = [fileManager URLForDirectory:NSCachesDirectory inDomain:NSUserDomainMask appropriateForURL:nil create:YES error:nil];
+    return [cachesDir URLByAppendingPathComponent:@"Important"];
+  } else if ([storage isEqual:STORAGE_AUXILIARY]) {
+    NSURL *cachesDir = [fileManager URLForDirectory:NSCachesDirectory inDomain:NSUserDomainMask appropriateForURL:nil create:YES error:nil];
+    return [cachesDir URLByAppendingPathComponent:@"Auxiliary"];
   } else if ([storage isEqual:STORAGE_TEMPORARY]) {
     return [NSURL fileURLWithPath:NSTemporaryDirectory()];
   } else {
@@ -45,7 +57,8 @@ + (NSString*)readFile:(NSString*)relativePath inStorage:(NSString*)storage error
   NSFileManager *fileManager = [NSFileManager defaultManager];
   BOOL fileExists = [fileManager fileExistsAtPath:[fullPath path]];
   if (!fileExists) {
-    NSDictionary *errorDetail = @{NSLocalizedDescriptionKey: @"File does not exist."};
+    NSString* errorMessage = [NSString stringWithFormat:@"File '%@' does not exist in storage: %@", relativePath, storage];
+    NSDictionary *errorDetail = @{NSLocalizedDescriptionKey: errorMessage};
     *error = [NSError errorWithDomain:@"FSComponent" code:1 userInfo:errorDetail];
     return nil;
   }

modules/FileSystem.js

@@ -31,4 +31,8 @@ export default class FileSystem {
   static async directoryExists(path, storage = FileSystem.storage.backedUp) {
     return await RNFileSystem.directoryExists(path, storage);
   }
+
+  static absolutePath(path, storage = FileSystem.storage.backedUp) {
+    return RNFileSystem[storage] + '/' + path;
+  }
 }