Python Decorator for Preventing Robot Indexing

By  on  

Much of my time at Mozilla has been spent catching up to the rest of the MDN team with respect to python.  The new MDN backend, codenamed Kuma, is entirely Django-based and has been a joy to learn.  My latest python adventures have been focused on increasing MDN's SEO score, a task which includes telling Google not to index given pages.  In doing so, I created my first view decorator:  a decorator that sends a response header which prevents a robot from indexing the given page.

The Python

The first step is importing the decorator dependencies:

from functools import wraps

The next step is creating the decorator definition:

def prevent_indexing(view_func):
    """Decorator to prevent a page from being indexable by robots"""
    @wraps(view_func)
    def _added_header(request, *args, **kwargs):
        response = view_func(request, *args, **kwargs)
        response['X-Robots-Tag'] = 'noindex'
        return response
    return _added_header

The original view is processed so that the response can be received;  simple add a key of X-Robots-Tag to the response, value set to noindex, and the decorator is complete!

To use the decorator, simply add it to a given view:

@login_required
@prevent_indexing
def new_document(request):
	""" Does whatever 'new_document' should do; page should not be indexed """

Voila -- the X-Robots-Tag header will be sent so that robots wont index the page!  Decorators allow for loads of additional functionality for any view, and are easily reusable;  I'm glad to add them to my arsenal!

Recent Features

  • By
    Page Visibility API

    One event that's always been lacking within the document is a signal for when the user is looking at a given tab, or another tab. When does the user switch off our site to look at something else? When do they come back?

  • By
    LightFace:  Facebook Lightbox for MooTools

    One of the web components I've always loved has been Facebook's modal dialog.  This "lightbox" isn't like others:  no dark overlay, no obnoxious animating to size, and it doesn't try to do "too much."  With Facebook's dialog in mind, I've created LightFace:  a Facebook lightbox...

Incredible Demos

  • By
    Highlighter: A MooTools Search & Highlight Plugin

    Searching within the page is a major browser functionality, but what if we could code a search box in JavaScript that would do the same thing? I set out to do that using MooTools and ended up with a pretty decent solution. The MooTools JavaScript Class The...

  • By
    Submit Button Enabling

    "Enabling" you ask? Yes. We all know how to disable the submit upon form submission and the reasons for doing so, but what about re-enabling the submit button after an allotted amount of time. After all, what if the user presses the "stop"...

Discussion

    Wrap your code in <pre class="{language}"></pre> tags, link to a GitHub gist, JSFiddle fiddle, or CodePen pen to embed!