How to upload image to s3 bucket in flutter

Posted By : Saurabh Singh | 30-Nov-2022

About flutter:

Flutter is an open-source UI software development kit (SDK) that was primarily created by Google. It is used to develop cross-platform applications for Android, iOS, Linux, macOS, Windows, and the web from a single codebase. 

 

1. About multipart request.

Using the HTTP package in flutter, we will able to send only string, int, list,date and double data-types. If you want to send images/videos/files to the server then we use multipart requests for that.

 

2. Code. 

2.1)Creating Project in  Flutter

2.1.1) open android studio and click on file > new >new flutter project

After that you need to provide some basic details about your project like project name, description organization, etc then hit the finish button. It will create a new project in Flutter.

2.1.2) open new pubspec.yaml file and install plugin(required).

2.1.3)  http package

 

2.1)code for Multipart Request

  

  uploadToS3 (image)async{

  Try{

  var postUri = Uri.parse("${postImageToS3}"); /// url

  var request = http.MultipartRequest("POST", postUri);

  Map<String, String> headers = { "access-token": "$ {dataStorage.read("authToken")}"}; /// header

  request.headers.addAll(headers);

 

  request.files.add(

      await http.MultipartFile.fromPath('file', image)); /// file that you need to send s3

  var response = await request.send();

  var responsed = await http.Response.fromStream(response);

 

  final responseData = json.decode(responsed.body);

 

  if (response.statusCode == 200) {

 /// if response.statuscode is 200 then you will get a image id from aws 

    var imagedetails= jsonDecode(responsed.body);

 

    /// s3 image id 

    print(imagedetails["imageId"]);

 

  }

 

  else if (response.statusCode == 401) {

    Get.off(() => LoginScreen());

  }

  else if (response.statusCode == 400) {

    

    log("errorCode ${response.statusCode}");

    Get.rawSnackbar(

      message: "Error in upLoading Image",

      snackPosition: SnackPosition.BOTTOM,

      snackStyle: SnackStyle.GROUNDED,

      backgroundColor: Colors.red

    );

  }

  else if (response.statusCode == 500) {

   Get.rawSnackbar(

        message: "Something Went Wrong from Server",

        snackPosition: SnackPosition.BOTTOM,

        margin: EdgeInsets.zero,

        snackStyle: SnackStyle.GROUNDED,

        backgroundColor: Colors.red);

  }

 

 } on SocketException {

   Get.rawSnackbar(

       message: "Internet Exception",

       snackPosition: SnackPosition.BOTTOM,

       margin: EdgeInsets.zero,

       snackStyle: SnackStyle.GROUNDED,

       backgroundColor: Colors.red);

 } catch (e) {

   Get.rawSnackbar(

       message: " $e Error Occured",

       snackPosition: SnackPosition.BOTTOM,

       margin: EdgeInsets.zero,

       snackStyle: SnackStyle.GROUNDED,

       backgroundColor: Colors.red);

 } finally {

  

 }

 

}

 

/// simple pass image to above method then it will allow you to upload image to s3 then get image id from aws on 200 response

 

 

 

 

 

 

About Author

Author Image
Saurabh Singh

Saurabh is working as a Mobile Application Developer with an overall 1+ years of experience. His areas of expertise are Flutter and Android Development. He is a detail-oriented person with good problem-solving skills.

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