Improving File Handling in Landing: A Move from Streaming to Storage

The landing project focuses on creating engaging landing page experiences. Recently, we tackled an issue with generating and serving CV files, specifically DOCX files. The initial approach of streaming the generated file directly to the user via php://output was causing file corruption issues. This post details the problem and the solution we implemented.

The Problem: Corrupted DOCX Files

Our system uses PhpWord to dynamically generate CV files in DOCX format. The initial implementation attempted to stream these files directly to the user's browser using PHP's php://output. However, this resulted in corrupted DOCX files, leading to errors when users tried to open them in Microsoft Word or other compatible software.

The Solution: Saving to Storage and Serving

To address the file corruption issue, we changed the process to first save the generated DOCX file to disk using PhpWord's saveToStorage() method. Once the file is successfully saved, we then serve it to the user using Laravel's Storage::download() method. This approach ensures that the complete, uncorrupted file is served to the user.

Here's an illustrative example of how the code might look:

<?php

use Illuminate\Support\Facades\Storage;

// Generate the DOCX file using PhpWord
$phpWord = new \PhpOffice\PhpWord\PhpWord();
// ... Add content to the document ...

$filename = 'cv_' . uniqid() . '.docx';
$filepath = storage_path('app/cvs/' . $filename);

// Save the file to storage
$phpWord->save($filepath, 'Word2007');

// Serve the file for download
return Storage::download('cvs/' . $filename, 'your_cv.docx');

In this example, the generated DOCX file is saved to the storage/app/cvs directory. Then, Storage::download() is used to serve the file to the user, prompting a download with the specified filename (your_cv.docx).

Benefits of the New Approach

• File Integrity: Saving the file to disk ensures that the complete and uncorrupted file is served to the user.
• Reduced Resource Usage: By saving the generated file, we avoid regenerating the file every time a user requests it. The stored file can be served directly, reducing server load.
• Improved User Experience: Users receive valid DOCX files that they can open and use without errors.

Conclusion

Switching from streaming DOCX files to saving and serving them from storage resolved a critical file corruption issue in the landing project. This change improved the user experience and reduced server load. When dealing with dynamically generated files, consider saving them to disk before serving to ensure file integrity and optimize performance.