Add copyFile

FS.common.js

@@ -25,6 +25,7 @@ var _readFile = Promise.promisify(RNFSManager.readFile);
 var _writeFile = Promise.promisify(RNFSManager.writeFile);
 var _appendFile = Promise.promisify(RNFSManager.appendFile);
 var _moveFile = Promise.promisify(RNFSManager.moveFile);
+var _copyFile = Promise.promisify(RNFSManager.copyFile);
 var _unlink = Promise.promisify(RNFSManager.unlink);
 var _mkdir = Promise.promisify(RNFSManager.mkdir);
 var _downloadFile = Promise.promisify(RNFSManager.downloadFile);
@@ -250,6 +251,10 @@ var RNFS = {
     return _moveFile(filepath, destPath).catch(convertError);
   },
 
+  copyFile(filepath: string, destPath: string): Promise<void> {
+    return _copyFile(filepath, destPath).catch(convertError);
+  },
+
   pathForBundle(bundleName: string): Promise<string> {
     return _pathForBundle(bundleName);
   },

README.md

@@ -307,6 +307,10 @@ type WriteFileOptions = {
 
 Moves the file located at `filepath` to `destPath`. This is more performant than reading and then re-writing the file data because the move is done natively and the data doesn't have to be copied or cross the bridge.
 
+### `copyFile(filepath: string, destPath: string): Promise<void>`
+
+Copies the file located at `filepath` to `destPath`.
+
 ### `unlink(filepath: string): Promise<void>`
 
 Unlinks the item at `filepath`. If the item does not exist, an error will be thrown.

RNFSManager.m

@@ -207,6 +207,22 @@ RCT_EXPORT_METHOD(moveFile:(NSString *)filepath
   callback(@[[NSNull null], [NSNumber numberWithBool:success], destPath]);
 }
 
+RCT_EXPORT_METHOD(copyFile:(NSString *)filepath
+                  destPath:(NSString *)destPath
+                  callback:(RCTResponseSenderBlock)callback)
+{
+  NSFileManager *manager = [NSFileManager defaultManager];
+
+  NSError *error = nil;
+  BOOL success = [manager copyItemAtPath:filepath toPath:destPath error:&error];
+
+  if (!success) {
+    return callback([self makeErrorPayload:error]);
+  }
+
+  callback(@[[NSNull null], [NSNumber numberWithBool:success], destPath]);
+}
+
 RCT_EXPORT_METHOD(downloadFile:(NSDictionary *)options
                   callback:(RCTResponseSenderBlock)callback)
 {

android/src/main/java/com/rnfs/RNFSManager.java

@@ -136,6 +136,27 @@ public class RNFSManager extends ReactContextBaseJavaModule {
     }
   }
 
+  @ReactMethod
+  public void copyFile(String filepath, String destPath, Callback callback) {
+    try {
+      InputStream in = new FileInputStream(filepath);
+      OutputStream out = new FileOutputStream(destPath);
+
+      byte[] buffer = new byte[1024];
+      int length;
+      while ((length = in.read(buffer)) > 0) {
+          out.write(buffer, 0, length);
+      }
+      in.close();
+      out.close();
+
+      callback.invoke(null, true, destPath);
+    } catch (Exception ex) {
+      ex.printStackTrace();
+      callback.invoke(makeErrorPayload(ex));
+    }
+  }
+
   @ReactMethod
   public void readDir(String directory, Callback callback) {
     try {