from PIL import Image, ImageDraw, ImageFont
from django.utils.six import BytesIO

def verify_code(request):
  #引入隨機(jī)函數(shù)模塊
  import random
  #定義變量，用于畫面的背景色、寬、高
  bgcolor = (random.randrange(20, 100), random.randrange(
    20, 100), 255)
  width = 100
  height = 25
  #創(chuàng)建畫面對(duì)象
  im = Image.new('RGB', (width, height), bgcolor)
  #創(chuàng)建畫筆對(duì)象
  draw = ImageDraw.Draw(im)
  #調(diào)用畫筆的point()函數(shù)繪制噪點(diǎn)
  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, fill=fill)
  #定義驗(yàn)證碼的備選值
  str1 = 'ABCD123EFGHIJK456LMNOPQRS789TUVWXYZ0'
  #隨機(jī)選取4個(gè)值作為驗(yàn)證碼
  rand_str = ''
  for i in range(0, 4):
    rand_str += str1[random.randrange(0, len(str1))]
  #構(gòu)造字體對(duì)象，ubuntu的字體路徑為“/usr/share/fonts/truetype/freefont”
  font = ImageFont.truetype('FreeMono.ttf', 23)
  #構(gòu)造字體顏色
  fontcolor = (255, random.randrange(0, 255), random.randrange(0, 255))
  #繪制4個(gè)字
  draw.text((5, 2), rand_str[0], font=font, fill=fontcolor)
  draw.text((25, 2), rand_str[1], font=font, fill=fontcolor)
  draw.text((50, 2), rand_str[2], font=font, fill=fontcolor)
  draw.text((75, 2), rand_str[3], font=font, fill=fontcolor)
  #釋放畫筆
  del draw
  #存入session，用于做進(jìn)一步驗(yàn)證
  request.session['verifycode'] = rand_str
  #內(nèi)存文件操作
  buf = BytesIO()
  #將圖片保存在內(nèi)存中，文件類型為png
  im.save(buf, 'png')
  #將內(nèi)存中的圖片數(shù)據(jù)返回給客戶端，MIME類型為圖片png
  return HttpResponse(buf.getvalue(), 'image/png'