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121 lines
4.3 KiB
Markdown
121 lines
4.3 KiB
Markdown
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---
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title: Updating EuroLoveMap
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date: 2014-03-27 14:00:00
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tags:
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- javascript
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- python
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- heroku
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---
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As part of the [OpeNER
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hackathon](http://www.opener-project.org/2013/07/18/opener-hackathon-in-amsterdam/)
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we decided to build a prototype that would allow us to compare how
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different countries feel about several topics. We used the OpeNER
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pipeline to get the sentiment from a set of newspaper articles we
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gathered from media in several languages. Then we aggregated those
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articles by category and country (using the source of the article or the
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language it was written in), obtaining the "overall feeling" of each
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country about each topic. Then, we used some fancy JavaScript to make
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sense out of the raw information.
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It didn't go too bad, it turns out [we
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won](http://eurosentiment.eu/wp-content/uploads/2013/07/BOLv9qnCIAAJEek.jpg).
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Now, it was time for a face-lift. I used this opportunity to play with
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new technologies and improve it:
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- Using Flask, this time using python 3.3 and Bootstrap 3.0
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- Cool HTML5+JS cards (thanks to
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[pastetophone](http://pastetophone.com))
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- Automatic generation of fake personal data to test the interface
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- Obfuscation of personal emails
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The result can be [seen here](http://eurolovemap.herokuapp.com/).
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Publishing a Python 3 app on Heroku
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-----------------------------------
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```bash
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mkvirtualenv -p /usr/bin/python3.3 eurolovemap
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```
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Since Heroku uses python 2.7 by default, we have to tell it which
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version we want, although it supports python 3.4 as well. I couldn't
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get python 3.4 working using the
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[deadsnakes](https://launchpad.net/~fkrull/+archive/deadsnakes) ppa, so
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I used python 3.3 instead, which works fine but is not officially
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supported. Just create a file named *runtime.txt* in your project root,
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with the python version you want to use:
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```bash
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python-3.3.1
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```
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Don't forget to freeze your dependencies so Heroku can install them:
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`bash pip freze > requirements.txt`
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Publishing personal emails
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--------------------------
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There are really sophisticated and effective ways to obfuscate personal
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emails so that spammers cannot easily grab yours. However, this time I
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needed something really simple to hide our emails from the simplest form
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of crawlers. Most of the team are in academia somehow, so in the end all
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our emails are available in sites like Google Scholar. Anyway, nobody
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likes getting spammed so I settled for a custom [Caesar
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cipher](http://en.wikipedia.org/wiki/Caesar_cipher). Please, don't use
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it for any serious application if you are concerned about being spammed.
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```python
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def blur_email(email):
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return "".join([chr(ord(i)+5) for i in email])
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```
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And this is the client side:
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```javascript
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window.onload = function(){
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elems = document.getElementsByClassName('profile-email');
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for(var e in elems){
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var blur = elems[e].innerHTML;
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var email = "";
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for(var s in blur){
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var a = blur.charCodeAt(s)
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email = email+String.fromCharCode(a-5);
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}
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elems[e].innerHTML = email;
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}
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}
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```
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Unfortunately, this approach does not hide your email from anyone using
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[PhantomJS](http://phantomjs.org/),
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[ZombieJS](http://zombie.labnotes.org/) or similar. For that, other
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approaches like generating a picture with the address would be
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necessary. Nevertheless, it is overkill for a really simple ad-hoc
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application with custom formatting and just a bunch of emails that would
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easily be grabbed manually.
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Generation of fake data
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-----------------------
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To test the contact section of the site, I wanted to populate it with
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fake data. [Fake-Factory](https://github.com/joke2k/faker) is an amazing
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library that can generate fake data of almost any kind: emails,
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association names, acronyms... It even lets you localise the results
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(get Spanish names, for instance) and generate factories for certain
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classes (à la Django).
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But I also wanted pictures, enter [Lorem Pixel](http://lorempixel.com/).
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With its API you can generate pictures of almost any size, for different
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topics (e.g. nightlife, people) and with a custom text. You can even use
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an index, so it will always show the same picture.
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For instance, the picture below is served through Lorem Pixel.
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By the way, if you only want cat pictures, take a look at
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[Placekitten](http://placekitten.com/). And for NSFW text, there's the
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[Samuel L. Jackson Ipsum](http://slipsum.com/)
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