feat: upload file with medatada

android/src/main/java/com/getcapacitor/plugin/http/FormUploader.java

@@ -96,7 +96,7 @@ private void appendFieldToWriter(String name, String value) {
      * @param uploadFile a File to be uploaded
      * @throws IOException Thrown if unable to parse the OutputStream of the connection
      */
-    public void addFilePart(String fieldName, File uploadFile, JSObject data) throws IOException {
+    public void addFilePart(String fieldName, File uploadFile, JSObject data, JSObject metadata) throws IOException {
         String fileName = uploadFile.getName();
         prWriter
             .append(LINE_FEED)
@@ -108,9 +108,25 @@ public void addFilePart(String fieldName, File uploadFile, JSObject data) throws
             .append("\"; filename=\"")
             .append(fileName)
             .append("\"")
-            .append(LINE_FEED)
+            .append(LINE_FEED);
+
+        if (metadata != null) {
+            prWriter
+                .append("Content-Type: application/json; charset=UTF-8")
+                .append(LINE_FEED)
+                .append(LINE_FEED)
+                .append(metadata.toString())
+                .append(LINE_FEED)
+                .append("--")
+                .append(boundary)
+                .append(LINE_FEED);
+        }
+
+        String contentType = URLConnection.guessContentTypeFromName(fileName);
+
+        prWriter
             .append("Content-Type: ")
-            .append(URLConnection.guessContentTypeFromName(fileName))
+            .append(contentType != null ? contentType : "application/octet-stream")
             .append(LINE_FEED)
             .append(LINE_FEED);
         prWriter.flush();

android/src/main/java/com/getcapacitor/plugin/http/HttpRequestHandler.java

@@ -486,6 +486,7 @@ public static JSObject uploadFile(PluginCall call, Context context) throws IOExc
         JSObject headers = call.getObject("headers");
         JSObject params = call.getObject("params");
         JSObject data = call.getObject("data");
+        JSObject metadata = call.getObject("metadata");
         ResponseType responseType = ResponseType.parse(call.getString("responseType"));
 
         URL url = new URL(urlString);
@@ -505,7 +506,7 @@ public static JSObject uploadFile(PluginCall call, Context context) throws IOExc
         connection.setDoOutput(true);
 
         FormUploader builder = new FormUploader(connection.getHttpConnection());
-        builder.addFilePart(name, file, data);
+        builder.addFilePart(name, file, data, metadata);
         builder.finish();
 
         return buildResponse(connection, responseType);

ios/Plugin/HttpRequestHandler.swift

@@ -122,7 +122,7 @@ class HttpRequestHandler {
         return output
     }
 
-    private static func generateMultipartForm(_ url: URL, _ name: String, _ boundary: String, _ body: [String:Any]) throws -> Data {
+    private static func generateMultipartForm(_ url: URL, _ name: String, _ boundary: String, _ body: [String: Any], _ metadata: [String: Any]) throws -> Data {
         let strings: [String: String] = body.compactMapValues { any in
             any as? String
         }
@@ -137,6 +137,15 @@ class HttpRequestHandler {
         data.append(
           "Content-Disposition: form-data; name=\"\(name)\"; filename=\"\(fname)\"\r\n".data(
             using: .utf8)!)
+
+        if (metadata.count != 0) {
+            let jsonData = try JSONSerialization.data(withJSONObject: metadata, options: .prettyPrinted)
+            let jsonString = String(data: jsonData, encoding: String.Encoding.utf8) ?? ""
+            data.append("Content-Type: application/json; charset=UTF-8\r\n\r\n".data(using: .utf8)!)
+            data.append(jsonString.data(using: .utf8)!)
+            data.append("\r\n--\(boundary)\r\n".data(using: .utf8)!)
+        }
+
         data.append("Content-Type: \(mimeType)\r\n\r\n".data(using: .utf8)!)
         data.append(fileData)
         strings.forEach { key, value in
@@ -206,6 +215,7 @@ class HttpRequestHandler {
         let headers = (call.getObject("headers") ?? [:]) as! [String: String]
         let params = (call.getObject("params") ?? [:]) as! [String: Any]
         let body = (call.getObject("data") ?? [:]) as [String: Any]
+        let metadata = (call.getObject("metadata") ?? [:]) as [String: Any]
         let responseType = call.getString("responseType") ?? "text";
         let connectTimeout = call.getDouble("connectTimeout");
         let readTimeout = call.getDouble("readTimeout");
@@ -230,7 +240,7 @@ class HttpRequestHandler {
         let boundary = UUID().uuidString
         request.setContentType("multipart/form-data; boundary=\(boundary)");
 
-        guard let form = try? generateMultipartForm(fileUrl, name, boundary, body) else { throw URLError(.cannotCreateFile) }
+        guard let form = try? generateMultipartForm(fileUrl, name, boundary, body, metadata) else { throw URLError(.cannotCreateFile) }
 
         let urlRequest = request.getUrlRequest();
         let task = URLSession.shared.uploadTask(with: urlRequest, from: form) { (data, response, error) in

src/definitions.ts

@@ -124,6 +124,10 @@ export interface HttpUploadFileOptions extends HttpOptions {
    * If this option is used, filePath can be a relative path rather than absolute
    */
   fileDirectory?: Directory;
+  /**
+   * Optionally, the metadata that come along with the file
+   */
+  metadata?: any;
 }
 
 export interface HttpCookie {