#245 Improvement for option for multiple values for the same field na…

…me in an Upload task

To specify multiple values for a single name, format the value as '"value1", "value2", "value3"'.
Specifically, the value needs to match the following RegEx: ^(?:"[^"]+"\s*,\s*)+"[^"]+"$

android/src/main/kotlin/com/bbflight/background_downloader/UploadTaskWorker.kt

@@ -152,7 +152,7 @@ class UploadTaskWorker(applicationContext: Context, workerParams: WorkerParamete
     ): TaskStatus {
         // field portion of the multipart, all in one string
         // multiple values should be encoded as '"value1", "value2", ...'
-        val multiValueRegEx = Regex("""(?:"[^"]+"\s*,\s*)*"[^"]+"""")
+        val multiValueRegEx = Regex("""^(?:"[^"]+"\s*,\s*)+"[^"]+"$""")
         var fieldsString = ""
         for (entry in task.fields.entries) {
             // Check if the entry value matches the multiple values format

ios/Classes/Uploader.swift

@@ -49,7 +49,7 @@ public class Uploader : NSObject, URLSessionTaskDelegate, StreamDelegate {
         }
         // field portion of the multipart, all in one string
         // multiple values should be encoded as '"value1", "value2", ...'
-        let multiValueRegEx = try! NSRegularExpression(pattern: #"(?:"[^"]+"\s*,\s*)*"[^"]+""#, options: [])
+        let multiValueRegEx = try! NSRegularExpression(pattern: #"^(?:"[^"]+"\s*,\s*)+"[^"]+"$"#, options: [])
         for entry in task.fields ?? [:] {
             let value = entry.value
             let fullRange = NSRange(location: 0, length: value.utf16.count)

lib/src/desktop/upload_isolate.dart

@@ -96,7 +96,7 @@ Future<TaskStatus> multipartUpload(
     UploadTask task, String filePath, SendPort sendPort) async {
   // field portion of the multipart, all in one string
   // multiple values should be encoded as '"value1", "value2", ...'
-  final multiValueRegEx = RegExp(r'(?:"[^"]+"\s*,\s*)*"[^"]+"');
+  final multiValueRegEx = RegExp(r'^(?:"[^"]+"\s*,\s*)+"[^"]+"$');
   var fieldsString = '';
   for (var entry in task.fields.entries) {
     if (multiValueRegEx.hasMatch(entry.value)) {

lib/src/task.dart

@@ -654,8 +654,8 @@ final class UploadTask extends Task {
 
   /// Map of name/value pairs to encode as form fields in a multi-part upload.
   /// To specify multiple values for a single name, format the value as
-  /// '"value1", "value2", "value3"' (note the double quotes and
-  /// the comma to separate the values).
+  /// '"value1", "value2", "value3"' so that it matches the following
+  /// RegEx: ^(?:"[^"]+"\s*,\s*)+"[^"]+"$
   final Map<String, String> fields;
 
   /// Creates [UploadTask]