Flask: How to handle application/octet-stream

Question

I want to make a multiple file-upload form.I use jQuery File Uploader. My server-side code:

@app.route(\"/new/photogallery\",methods=[\"POST\"])
def newPhotoGall         


        

Answer 1

I was unable to get a request working using application/octet-stream type posts, but have used multipart/form-data type forms in the past to upload images using flask.

I have extended what I have done in the past to support multiple upload files and this has worked leveraging werkzeug's FileStorage objects.

The key here is setting up a post based route that is looking for a request element from a form. This should allow you to POST to the route either via a standard form or an AJAX call.

Below is a simplified example that is using a form:

Template for the view:

{% if err %}
    
{{ err }}
{% endif %}


    
    


{% if files %}
{% for file in files %}
Uploaded: {{ file }} 
{% endfor %}
{% endif %}
 

Flask App

from flask import Flask, request, render_template
from werkzeug import secure_filename, FileStorage
import os

# Flask functions
app = Flask(__name__) 
app.config.from_object(__name__)
DEBUG = True 
# add this so that flask doesn't swallow error messages
app.config['PROPAGATE_EXCEPTIONS'] = True

@app.route('/', methods=['GET', 'POST'])
def uploader():
    if request.method =='POST' and request.files.getlist('files'):
        up_file_list = []

        # Iterate the through a list of files from the form input field
        for a_file in request.files.getlist('files'):
            if a_file.filename:
                # Validate that what we have been supplied with is infact a file
                if not isinstance(a_file, FileStorage):
                    raise TypeError("storage must be a werkzeug.FileStorage")
                # Sanitise the filename
                a_file_name = secure_filename(a_file.filename)
                # Build target
                a_file_target = os.path.join('/tmp/', a_file_name)
                # Save file 
                a_file.save(a_file_target)
                up_file_list.append(a_file_name)
        # Return template
        if up_file_list:
            return render_template('uploader.html', err=None, files=up_file_list)
        else:
            return render_template('uploader.html', err='No Files Uploaded', files=None)
    else:
        return render_template('uploader.html', err=None, files=None) 


# application execution 
if __name__ == '__main__': 
    app.run()