CB-9837 Add data URI support to file-transfer upload on iOS

Adds iOS and Windows implementation; mention in the docs Adds corresponding tests Increases spec.35 timeout for Windows Phone 8.1 case as it contains 2 download operations

Author: daserge

README.md

@@ -74,7 +74,7 @@ multi-part POST or PUT request, and to download files as well.
 
 __Parameters__:
 
-- __fileURL__: Filesystem URL representing the file on the device. For backwards compatibility, this can also be the full path of the file on the device. (See [Backwards Compatibility Notes] below)
+- __fileURL__: Filesystem URL representing the file on the device or a [data: URI](https://en.wikipedia.org/wiki/Data_URI_scheme). For backwards compatibility, this can also be the full path of the file on the device. (See [Backwards Compatibility Notes](#backwards-compatibility-notes) below)
 
 - __server__: URL of the server to receive the file, as encoded by `encodeURI()`.
 

src/ios/CDVFileTransfer.m

@@ -244,6 +244,11 @@ - (NSURLRequest*)requestForUploadCommand:(CDVInvokedUrlCommand*)command fileData
  int numChunks = sizeof(chunks) / sizeof(chunks[0]);
 
  for (int i = 0; i < numChunks; ++i) {
+ // Allow uploading of an empty file
+ if (chunks[i].length == 0) {
+ continue;
+ }
+
  CFIndex result = WriteDataToStream(chunks[i], writeStream);
  if (result <= 0) {
  break;
@@ -297,6 +302,28 @@ - (void)fileDataForUploadCommand:(CDVInvokedUrlCommand*)command
  NSString* server = [command argumentAtIndex:1];
  NSError* __autoreleasing err = nil;
 
+ if ([source hasPrefix:@"data:"] && [source rangeOfString:@"base64"].location != NSNotFound) {
+ NSRange commaRange = [source rangeOfString: @","];
+ if (commaRange.location == NSNotFound) {
+ // Return error is there is no comma
+ __weak CDVFileTransfer* weakSelf = self;
+ CDVPluginResult* result = [CDVPluginResult resultWithStatus:CDVCommandStatus_ERROR messageAsDictionary:[weakSelf createFileTransferError:INVALID_URL_ERR AndSource:source AndTarget:server]];
+ [weakSelf.commandDelegate sendPluginResult:result callbackId:command.callbackId];
+ return;
+ }
+
+ if (commaRange.location + 1 > source.length - 1) {
+ // Init as an empty data
+ NSData *fileData = [[NSData alloc] init];
+ [self uploadData:fileData command:command];
+ return;
+ }
+
+ NSData *fileData = [[NSData alloc] initWithBase64EncodedString:[source substringFromIndex:(commaRange.location + 1)] options:NSDataBase64DecodingIgnoreUnknownCharacters];
+ [self uploadData:fileData command:command];
+ return;
+ }
+
  CDVFilesystemURL *sourceURL = [CDVFilesystemURL fileSystemURLWithString:source];
  NSObject<CDVFileSystem> *fs;
  if (sourceURL) {