This vulnerability can be used by hackers to hack the server. This is done because there is a possibility that user might name the file which clashes with some system configuration file, In this case if uploaded filename is not changed then system file will be overwritten. Note that we used secure_filename function to obtain filename which we use to store file in the server filesystem. We check the name of the uploaded file before we save it to server filesystem. This file needs to be saved in the UPLOAD_FOLDER path that we created earlier.
Uploaded file attached in the POST request can be referenced by request.files. It returns the index.html page when the browser sends a GET request and saves the uploaded file, processes it and returns processed file when POST request is made. In the above method, it can be clearly seen that the index method supports both GET and POST requests. config, filename ), filename ) return redirect ( url_for ( 'uploaded_file', filename = filename )) return render_template ( 'index.html' ) filename ): filename = secure_filename ( file. filename = '' : print ( 'No file selected' ) return redirect ( request. files : print ( 'No file attached in request' ) return redirect ( request. method = 'POST' : if 'file' not in request. route ( '/', methods = ) def index (): if request. Let the HTML page be index.htmlįrom flask import Flask, request, redirect, url_for, render_template, send_from_directory from werkzeug.utils import secure_filename app. We will create a simple HTML page that provides a button to select file and another button to upload that file. For that we need to get user file, process (remove watermark from pdf file) and provide processed file to user for download. We will be creating back-end to remove watermark from pdf files.
#Flask pdf search how to
How to provide interface to user for uploading a file.There are many examples of using this functionality.
#Flask pdf search download
Sites that allow users to edit pdf online require uploading, processing and allowing users to download processed file.All the image editing sites online require uploading of image, then process them online and provide processed image for downloading.This is quite a common requirement for webapps nowadays. In this article, we are going to learn how to handle files from server i.e how to facilitate uploading and download for files in Flask.