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POValidating captcha in Flask
 

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  1. POValidating captcha in Flask
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    <p>I am creating a captcha just for an exercise. The creation of the captcha images seem fine. But every time I try validating the captcha challenge entered by the user, the validation is done against the next captcha. I am stuck at how to go with this. Function for creating captcha images- captcha.py</p> <pre><code>import random import Image import ImageFont import ImageDraw import ImageFilter import JpegImagePlugin import PngImagePlugin def gen_captcha(text, fnt, fnt_sz, file_name, fmt='JPEG'): fgcolor = random.randint(0,0xff0000) bgcolor = fgcolor ^ 0xffffff font = ImageFont.truetype(fnt,fnt_sz) dim = font.getsize(text) im = Image.new('RGB', (dim[0]+5,dim[1]+5), bgcolor) d = ImageDraw.Draw(im) x, y = im.size r = random.randint for num in range(100): d.rectangle((r(0,x),r(0,y),r(0,x),r(0,y)),fill=r(0,0xffff00)) d.text((3,3), text, font=font, fill=fgcolor) im = im.filter(ImageFilter.EDGE_ENHANCE_MORE) im.save(file_name) </code></pre> <p>signup function from views.py</p> <pre><code>@app.route('/signup', methods = ['GET', 'POST']) def signup(): if g.user is not None and g.user.is_authenticated(): return redirect(url_for('index')) words = open('app/corncob_caps.txt').readlines() captcha_word = words[random.randint(1,len(words))] captcha_filename = ''.join(random.choice(string.ascii_uppercase + string.digits) for x in range(10)) + '.jpg' captcha.gen_captcha(captcha_word.strip(), 'app/os.ttf', 25, 'app/static/' + captcha_filename + '') form = SignUpForm(captcha_word) if form.validate_on_submit() == False: return render_template('signup.html', form = form, filename = captcha_filename) else: user = User(form.email.data, form.password.data) db.session.add(user) db.session.commit() flash('You have successfully signed up.') flash('You may login now.') return redirect(url_for('login')) return render_template('signup.html', form = form, filename = captcha_filename) </code></pre> <p>I am passing the captcha_word to my form class. The form class is:</p> <pre><code>class SignUpForm(Form): email = EmailField('Email Address', validators = [email()]) password = PasswordField('Password', validators = [Required('Please enter a valid password between 8 and 30 characters.'), Length(min = 8, max = 30)]) captcha = TextField('Captcha', validators = [Required('You must enter the challenge captcha.')]) submit = SubmitField('Create Account') captcha_word = '' def __init__(self, word, *args, **kwargs): Form.__init__(self, *args, **kwargs) self.get_word(word) def get_word(self, word): self.captcha_word = word def validate(self): if not Form.validate(self): return False elif self.captcha_word != self.captcha.data.upper(): print self.captcha_word print self.captcha.data.upper() self.captcha.errors.append("Wrong captcha!") return False user = self.get_user() if user: self.email.errors.append("That email is already taken.") return False else: return True def get_user(self): return User.query.filter_by(email = self.email.data.lower()).first() </code></pre> <p>I inserted the two print statements inside to see why the comparison was coming wrong. The first print showed the next captcha whereas the <code>print self.captcha.data.upper()</code> displayed the user entered data.</p> <p>I am not sure, but it seems the signup route is being called twice. But I don't know how to fix this. Any ideas? </p>
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