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    <p>If you need to use a captcha, you can use the <a href="https://flask-wtf.readthedocs.org/en/latest/form.html#recaptcha" rel="nofollow">feature that's already built into Flask-WTF</a> and save yourself reinventing the wheel. </p> <p>If you do want to reinvent the wheel, then the main problem you're having is that you're recreating the captcha when the user submits the form, you have no way to remember and refer to the old value.</p> <p>So this is how it's working at the moment:</p> <ul> <li>User goes to sign in, you generate a captcha, then because they haven't submitted a form, it shows the sign in form including the captcha picture.</li> <li>User fills in the form and hits the submit button- this loads the signup view again,<strong>creates a new random captcha</strong>, then goes down the form submitted logic path, so when you compare the user captcha data to the current captcha data, it doesn't match.</li> </ul> <p>So you're missing persistence, the captcha you generate the first time round doesn't get held anywhere, so when the user submits you've got no way to refer back to it. So you need to store that captcha word somewhere. You could simply just store that captcha word in the user's session and use that to validate against when you need to, or perhaps sign it with <a href="https://flask-wtf.readthedocs.org/en/latest/form.html#recaptcha" rel="nofollow">itsdangerous</a> and store it in the form itself as a hidden field?</p> <h3>Code Example:</h3> <p>This just takes your code and adjusts it a little to store the value in the session-- not tested, and can definitely been improved, but should work:</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')) if request.method == 'post': captcha_word = session["captcha"] else: words = open('app/corncob_caps.txt').readlines() captcha_word = words[random.randint(1,len(words))] session["captcha"] = captcha_word 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>
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    1. POValidating captcha in Flask
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    1. POValidating captcha in Flask
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    1. COThanks Doobeh. How do I go about storing it? If I store it in the session using say `session['captcha'] = captcha_word` it'll be rewritten on the subsequent call when the user submits the form. So do I store the previous result in a file?
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    2. COOkay. I kind of found an ad-hoc solution for this. I built a custom inline validator and kept the previous input in a file, read it in a list and validated it with the given input. It works. Is there any other elegant solution?
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    3. COI think the easiest thing would be to add a little more detection-- so if you added `if request.method == 'post':` you can isolate when the user submits the form, and you can leave the captcha generation etc for the `else:` site of that.
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