Extension of ASP.NET Web API FileManager

Context

The goal is to extend an existing ASP.NET Web API FileManager to implement a new feature. We will assume we are focusing on enhancing the model to support additional file operations like renaming files. This will involve extending the existing controller class to handle the POST request for renaming files.

Existing Code Analysis

The existing code likely contains a FileManagerController in an ASP.NET Web API application, which includes various operations for file handling such as uploading, downloading, and deleting files. Assuming the existing file operations are structured in standard RESTful conventions, we will add a new endpoint for renaming files.

Example of an Existing Controller Snippet (for Reference)

public class FileManagerController : ApiController
{
    // Existing methods for file upload, download, delete, etc.
    
    [HttpPost]
    public IHttpActionResult UploadFile(FileModel fileModel)
    {
        // Logic for uploading a file
    }
    
    [HttpGet]
    public IHttpActionResult DownloadFile(string fileName)
    {
        // Logic for downloading a file
    }
}

New Functionality: Rename File

Implementation Instructions

We will implement a new method named RenameFile that takes a RenameFileModel containing the current file name and the new name for the file.

RenameFileModel Class

First, we need to define the model for the rename operation.

public class RenameFileModel
{
    public string CurrentFileName { get; set; }
    public string NewFileName { get; set; }
}

Extended Controller Code

Next, we will integrate the rename functionality into the FileManagerController.

public class FileManagerController : ApiController
{
    // Existing methods for file upload, download, delete, etc.
    
    [HttpPost]
    public IHttpActionResult UploadFile(FileModel fileModel)
    {
        // Logic for uploading a file
    }
    
    [HttpGet]
    public IHttpActionResult DownloadFile(string fileName)
    {
        // Logic for downloading a file
    }

    [HttpPost]
    [Route("api/filemanager/rename")]
    public IHttpActionResult RenameFile([FromBody] RenameFileModel renameFileModel)
    {
        if (renameFileModel == null)
        {
            return BadRequest("RenameFileModel cannot be null.");
        }

        if (string.IsNullOrEmpty(renameFileModel.CurrentFileName) || 
            string.IsNullOrEmpty(renameFileModel.NewFileName))
        {
            return BadRequest("Both current and new file names must be provided.");
        }

        try
        {
            // Path to the directory where files are stored
            string directoryPath = HttpContext.Current.Server.MapPath("~/Files");
            string currentFilePath = Path.Combine(directoryPath, renameFileModel.CurrentFileName);
            string newFilePath = Path.Combine(directoryPath, renameFileModel.NewFileName);

            if (!System.IO.File.Exists(currentFilePath))
            {
                return NotFound();
            }

            System.IO.File.Move(currentFilePath, newFilePath);
            return Ok("File renamed successfully.");
        }
        catch (Exception ex)
        {
            return InternalServerError(ex);
        }
    }
}

Summary

In summary, we have extended the FileManagerController in an ASP.NET Web API to include a new functionality for renaming files. The addition of the RenameFile method adheres to established best practices, such as validation and error handling, while preserving the integrity of the original codebase.

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