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# Upload

Create app.py and run by terminal, and create uploads folder in the current directory.

app.py

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import os
from flask import Flask, render_template, make_response, flash, request, redirect, url_for
from werkzeug.utils import secure_filename


app = Flask(__name__)

UPLOAD_FOLDER = 'uploads'
ALLOWED_EXTENSIONS = {'txt', 'pdf', 'png', 'jpg', 'jpeg', 'gif'}

app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER


def allowed_file(filename):
    return '.' in filename and \
           filename.rsplit('.', 1)[1].lower() in ALLOWED_EXTENSIONS

@app.route('/upload', methods=['GET', 'POST'])
def upload_file():
    if request.method == 'POST':
        # check if the post request has the file part
        if 'file' not in request.files:
            flash('No file part')
            return redirect(request.url)
        file = request.files['file']
        # If the user does not select a file, the browser submits an
        # empty file without a filename.
        if file.filename == '':
            flash('No selected file')
            return redirect(request.url)
        if file and allowed_file(file.filename):
            filename = secure_filename(file.filename)
            file.save(os.path.join(app.config['UPLOAD_FOLDER'], filename))
            # return redirect(url_for('download', name=filename))

    return '''
    <!doctype html>
    <title>Upload new File</title>
    <h1>Upload new File</h1>
    <form method=post enctype=multipart/form-data>
      <input type=file name=file>
      <input type=submit value=Upload>
    </form>
    '''

Bash

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$ export FLASK_APP=app
$ flask run
 * Running on http://127.0.0.1:5000/

CMD

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> set FLASK_APP=app
> flask run
 * Running on http://127.0.0.1:5000/

Powershell

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> $env:FLASK_APP = "app"
> flask run
 * Running on http://127.0.0.1:5000/

Then visit http://127.0.0.1:5000/ by chrome, Choose file & Upload . You will find the file occurs in the uploads folder.

# Test Uplaod by Other ways

# Postman

notice KEY need use file , because in python get files by file = request.files['file']

# VSCode RestClient

notice file=@test.jpg and name="file"

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### curl upload
curl -X POST -F file=@test.jpg http://127.0.0.1:5000/upload


### rest upload
POST http://127.0.0.1:5000/upload HTTP/1.1
Content-Type: multipart/form-data; boundary=myboundary

--myboundary
Content-Disposition: form-data; name="file"; filename="test.jpg"
Content-Type: image/png

< ./test.jpg
--myboundary--

# Curl

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curl -X POST -F file=@test.jpg http://127.0.0.1:5000/upload

# Download

Add content as below in app.py , response need set Content-Disposition .

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@app.route('/')
def download():
    return render_template('download.html')


@app.route('/download_csv/')
def download_csv():
    csv = 'foo,bar,baz\nhai,bai,crai\n'
    response = make_response(csv)
    response.headers['Content-Disposition'] = 'attachment; filename=test.csv'
    response.mimetype = 'text/csv'

    return response

create templates/download.html

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<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8" />
        <meta http-equiv="X-UA-Compatible" content="IE=edge" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <title>Download</title>
    </head>
    <body>
        <a href="/download_csv" >Click here to Download</a><br/>
        <a download="test.csv" href="static/test.csv">Click here to Download (HTML5 Support)</a>
    </body>
</html>

create static/test.csv

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foo,bar,baz
hai,bai,crai

Then visit http://127.0.0.1:5000/ by chrome, a dialog box is displayed asking you to save the file.

Edited on