Unable to get file or file path from a MultipartFile object

Request Statement

Hello Team,

Thank you for maintaining and enhancing the Dio library; it's an essential tool for many developers. I am using the latest version of Dio and encountered a limitation that affects my use case.

Context

I am implementing a feature that requires generating a checksum key by encrypting the entire payload during request interception. While encrypting, I must include file information (e.g., file path or file content) in the checksum generation for requests containing MultipartFile.

Current Issue

Currently, the MultipartFile class does not provide a direct way to access file information such as the file path or File object during request interception. This limitation makes it challenging to include the file content in the encryption process.

Feature Request

I kindly request the addition of a parameter or method in the MultipartFile class to access file information, such as:

The file path (if applicable).
A File object (if the source file exists).

Example

final file = MultipartFile.fromFileSync('path/to/file', filename: 'example.txt');
// Access file information
print(file.filePath); // Outputs: path/to/file
print(file.file);     // Outputs: File object

Benefits

Enables comprehensive payload encryption during interception, including file content.
Simplifies workflows that rely on accessing file metadata or content.

Thank you for considering this feature request. I am happy to provide additional details or talk about this more if you need them.

Solution Brainstorm

No response

Start with the MultipartFile class and the fromFileSync example described in the issue, then trace how MultipartFile is exposed during request interception. Define and implement the requested file path, File object, or equivalent access, and verify that multipart requests can include the needed file information for checksum generation.