## mark a section (Learn more)

import urllib import re import random import hashlib class CapatchaController: #--- Captcha ---------------------------------------------- re_all_img = re.compile('<img.+?>') re_img_src = re.compile('src="(.+?)"') def _getPictures(self, type, count): page = random.randint(0, 35) if type == 'birds': url = 'http://www.flickr.com/groups/beautifulbirdscom/pool/page%s' % page elif type == 'cats': url = 'http://www.flickr.com/photos/tags/kitty/clusters/cat-kitten-cute/page%s' % page else: raise Exception('Invalid type arugment, should be "birds" or "cats", you gave %s' % type) result = [] html = urllib.urlopen(url).read() img_tags = list(self.re_all_img.finditer(html)) random.shuffle(img_tags) for img_tag in img_tags: img_tag = img_tag.group(0) if 'class="pc_img"' in img_tag: result.append( self.re_img_src.search(img_tag).group(1) ) if len(result) >= count: break return result @amiweb.expose def getCaptchaHTML(self): matches = self._getPictures('birds', 5) cats = self._getPictures('cats', 1) session()['captcha_current_url'] = cats[0] matches.extend(cats) random.shuffle(matches) form_html = [] form_html.append('<form><table>') li_item = '<td><input type="radio" name="c_match" value="%s" /> <img src="%s" /></td>' for i in range(0, len(matches), 2): img_1 = matches[i] img_2 = matches[i+1] form_html.append('<tr>') form_html.append(li_item % (img_1, img_1)) form_html.append(li_item % (img_2, img_2)) form_html.append('</tr>') form_html.append('</table></form>') return ' '.join(form_html) @amiweb.expose def validateCaptcha(self, url, content): cur_url = session().get('captcha_current_url') if url == cur_url: session()['captcha_ok_for'] = hashlib.md5(content).hexdigest() return 'ok' #Only one guess if cur_url: del session()['captcha_current_url'] return 'error' @amiweb.expose def showCaptcha(self): ns = { 'template': self.template } return render("site_plugins/blog/view/show_captcha.tmpl", ns)

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