feat(upload): added an option to start upload at first request

CHANGELOG.md

@@ -1,3 +1,7 @@
+## [1.0.3] - Added support for Creation W/ Upload
+
+* Added an optional `uploadDataDuringCreation` options (see [TUS documentation](https://tus.io/protocols/resumable-upload#creation-with-upload))
+
 ## [1.0.2] - Fixed issue with not parsing the http port number 
 
 * Fixed issue with not parsing the http port number 

lib/src/client.dart

@@ -20,6 +20,10 @@ class TusClient {
   /// Storage used to save and retrieve upload URLs by its fingerprint.
   final TusStore? store;
 
+  /// Whether to upload the file data during creation
+  /// (see [create] method)
+  final bool uploadDataDuringCreation;
+
   final XFile file;
 
   final Map<String, String>? metadata;
@@ -51,6 +55,7 @@ class TusClient {
     this.headers,
     this.metadata = const {},
     this.maxChunkSize = 512 * 1024,
+    this.uploadDataDuringCreation = false,
   }) {
     _fingerprint = generateFingerprint() ?? "";
     _uploadMetadata = generateMetadata();
@@ -83,7 +88,20 @@ class TusClient {
         "Upload-Length": "$_fileSize",
       });
 
-    final response = await client.post(url, headers: createHeaders);
+    Uint8List? initialChunk;
+
+    if (uploadDataDuringCreation) {
+      createHeaders["Content-Type"] = "application/offset+octet-stream";
+      createHeaders["Upload-Offset"] = "0";
+
+      initialChunk = await _getData();
+    }
+
+    final response = await client.post(
+      url,
+      headers: createHeaders,
+      body: initialChunk,
+    );
     if (!(response.statusCode >= 200 && response.statusCode < 300) &&
         response.statusCode != 404) {
       throw ProtocolException(