Implement captcha in Django projects
PIL/ Pillow and Random generate an image and a string of random numbers in the background and store them in memory (or directly in your Django project).
#! /usr/bin/env python # -*- coding:utf-8 -*- import random from PIL import Image, ImageDraw, ImageFont, ImageFilter _letter_cases = "abcdefGHjkmnpQrSTUvwxy" # lowercase letters, remove possible interference I, L, O, Upper_cases = _letter_cases. Upper () # upper_numbers = ". Join (map(STR, range(3,)) Join ((_letter_cases, _upper_cases, _numbers)) def create_validate_code(size=(120, 30), chars=init_chars, img_type="GIF", mode="RGB", bg_color=(255, 255, 255), fg_color=(0, 0, 255), font_size=18, font_type="Monaco.ttf", length=4, draw_lines=True, n_line=(1, 2), draw_points=True, point_chance=2): """ @todo: @param size: specifies the size and format (width, height) of the image. The default value is (120, 30). @param chars: Specifies the set of allowed characters. GIF, JPEG, TIFF, PNG @param mode: image mode, default: RGB @param bg_color: background color, default: white @param fg_color: #0000FF @param font_size: captcha font size @param font_type: Captcha font size: ae_alarabiya. ttf@param length: Number of verification code characters @param draw_lines: indicates whether to draw interference lines. @param n_lines: indicates the number of interference lines. The format is a tuple. PIL Image instance @return: [1]: PIL Image instance @return: [1]: Img = image.new (mode, size, size) Draw = ImageDraw.Draw(img) # def get_chars(): """ return random. Sample (chars, length) def create_lines(): "" line_num = random. Randint (*n_line) # for I in range(line_num): Begin = (random.randint(0, size[0]), random.randint(0, size[1])) end = (random.randint(0, size[0]), random.randint(0, size[1])) draw.line([begin, end], fill=(0, 0, 0)) def create_points(): "" chance = min(100, Max (0, int(point_chance)) # for w in range(width): for h in range(height) tmp = random.randint(0, 100) if tmp > 100 - chance: draw.point((w, h), fill=(0, 0, 0)) def create_strs(): "" c_chars = get_chars() STRS = '%s' % '. Join (c_chars) # Separate each character with a space font_size) font_width, font_height = font.getsize(strs) draw.text(((width - font_width) / 3, (height - font_height) / 3), strs, font=font, fill=fg_color) return ''.join(c_chars) if draw_lines: create_lines() if draw_points: Create_points () STRS = create_strs() # params = [1-float (random.randint(1, 2)) / 100, 0, 0, 0, params = [1-float (random.randint(1, 2))) / 100, 0, 0, 0, 1 - float(random.randint(1, 10)) / 100, float(random.randint(1, 2)) / 500, 0.001, float(random.randint(1, 10)) / 500, 0.001, float(random.randint(1, 10)) 2)) / 500 ] img = img.transform(size, Image.PERSPECTIVE, Img = img.filter(ImageFilter.EDGE_ENHANCE_MORE) # return img, STRSCopy the codeYou can also write it directly in views.py, as shown in the figure below
def verifycode(request): Print (path_to_static) # from PIL import Image, ImageDraw, ImageFont Bgcolor = (random.randrange(20, 100), random.randrange(20, 100), random.randrange(20, 100) Im = image.new ('RGB', (width, height), Draw = imagedRaw.draw (im) # Call the point() function of the brush to draw noise for I in range(0, 100): xy = (random.randrange(0, width), random.randrange(0, height)) fill = (random.randrange(0, 255), 255, random.randrange(0, 255)) draw.point(xy, The fill = the fill) # define captcha values of alternative STR = '123456789 qwertyupasdfghjklzxcvbnmqwertyupasdfghjklzxcvbnm # randomly selected from four values as a captcha rand_str =' for i in range(0, 4): rand_str += str[random.randrange(0, Len (STR))] # store session case insensitive request.session['check_code'] = rand_str.lower() # construct font object font = Fontcolor1 = (255, random. Randrange (0, 255), random. Randrange (0, 0) 255)) fontcolor2 = (255, random.randrange(0, 255), random.randrange(0, 255)) fontcolor3 = (255, random.randrange(0, 255), random.randrange(0, 255)) fontcolor4 = (255, random.randrange(0, 255), random.randrange(0, Draw. Text ((5, 2), rand_str[0], font=font, fill=fontcolor1) draw. Text ((25, 2), rand_str[1], font=font, fill=fontcolor2) draw.text((50, 2), rand_str[2], font=font, fill=fontcolor3) draw.text((75, 2), rand_str[3], font=font, Fill =fontcolor4) # Request.session ['verifycode'] = rand_str.lower() # import IO buf = io.bytesio () # save images in memory Save (buf, 'PNG ') PNG check_code = rand_str return HttpResponse(buf.getValue (), 'image/ PNG ')Copy the codeIt will be used as an interface to interact with the front page, and will also configure a file about fonts simkai. TTF, link: pan.baidu.com/s/1_SwGqhD7… Extract code: BME9 can extract the method that finally invokes the verification code in the login interface.
