First up, we're going to need some imports from flask. Go ahead and import the following:. Before we jump in and create any routes, I want to quickly discuss variable rules which we've touched on before.
Although not a necessity, Flask provides us with some useful converters to add an additional layer of validation to any values soming in via the URL.
Using any of the converters listed above will convert the incoming variable into it's related type. Like many other important application configuration variables, we're going to add 3 new entries to our app.
But before we do so, we're going to create some new directories and add some files for our users to download:. We're going to create 3 new entries in our app. Now that we've updated our app config, let's go ahead and create our routes I'd recommend using a config file for this which you can read more about here.
As we haven't set a variable rule, Flask will default to string and not allow any slashes. Here I am going to show a simple example on how to download a file from web application using Python Flask. I will download the file which is kept in the server location. The file could be of any type of file, i. In this example there will be a simple UI user Interface , where a link will be provided to the end users and clicking on the download link a file will be download.
The downloaded file will ask you to choose a file location for saving it. There could be any reason to download a file from server. The reason could be, you want to generate reports from database and download these reports.
Now I will create the web application that will download any kind of file which is kept in a server location. First step is to create a project root directory under which I will put all the required files for the project. 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.
This vulnerability can be used by hackers to hack the server. For this task i. First we should be able to read pdf file, for that we would use PyPDF2 module. I simply reduced the height of the page which cuts the watermark from the image. Once height of image is reduced I add the modified pdf page to another pdf which I would expose to user for download. Once the uploaded file is processed, we send it to user i. My images are stored in a MongoDB, and I'd like to return them to the client, here is how the code is like: app.
My idea so far: Return the base64 of the image binary. Are there better solutions? B--rian 4, 9 9 gold badges 29 29 silver badges 70 70 bronze badges.
Add a comment. Active Oldest Votes. If it is not a BytesIO, but some other file-object that does require a call to close , who will call it? Using Python 3 and Flask 0. Baruch use with clause? BytesIO obj. Jaza Jaza 2, 2 2 gold badges 18 18 silver badges 24 24 bronze badges. Suppose i have the stored image path with me. The below code helps to send image through. Dikshit Kathuria Dikshit Kathuria 10 10 silver badges 13 13 bronze badges. What if the image is in-memory.
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