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https://github.com/QingdaoU/OnlineJudge.git
synced 2024-09-21 00:13:18 +00:00
完善captchaapi
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zemal
parent
57b75fd511
commit
d1767e775d
@ -4,6 +4,8 @@ from ..views.oj import (ApplyResetPasswordAPI, ResetPasswordAPI,
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UserChangePasswordAPI, UserRegisterAPI,
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UserLoginAPI, UserLogoutAPI)
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from utils.captcha.views import CaptchaAPIView
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urlpatterns = [
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url(r"^login/?$", UserLoginAPI.as_view(), name="user_login_api"),
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url(r"^logout/?$", UserLogoutAPI.as_view(), name="user_logout_api"),
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@ -11,5 +13,5 @@ urlpatterns = [
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url(r"^change_password/?$", UserChangePasswordAPI.as_view(), name="user_change_password_api"),
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url(r"^apply_reset_password/?$", ApplyResetPasswordAPI.as_view(), name="apply_reset_password_api"),
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url(r"^reset_password/?$", ResetPasswordAPI.as_view(), name="apply_reset_password_api"),
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url(r"^captcha/?$", "utils.captcha.views.show_captcha", name="show_captcha"),
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url(r"^captcha/?$", CaptchaAPIView.as_view(), name="show_captcha"),
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]
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@ -1,12 +1,9 @@
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"""
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Copyright 2013 TY<tianyu0915@gmail.com>
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Copyright 2017 TY<master@t-y.me>
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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@ -15,95 +12,147 @@ limitations under the License.
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"""
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import os
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import time
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import random
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from io import BytesIO
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from django.http import HttpResponse
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from math import ceil
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from six import BytesIO
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from PIL import Image, ImageDraw, ImageFont
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__version__ = '0.3.3'
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current_path = os.path.normpath(os.path.dirname(__file__))
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class Captcha(object):
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def __init__(self, request):
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""" something init
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"""
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初始化,设置各种属性
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"""
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self.django_request = request
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self.session_key = "_django_captcha_key"
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self.captcha_expires_time = "_django_captcha_expires_time"
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# 验证码图片尺寸
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self.img_width = 90
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self.django_request = request
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self.session_key = '_django_captcha_key'
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self.words = ["hello", "word"]
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# image size (pix)
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self.img_width = 150
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self.img_height = 30
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def _get_font_size(self, code):
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"""
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将图片高度的80%作为字体大小
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"""
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self.type = 'number'
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self.mode = 'number'
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def _get_font_size(self):
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s1 = int(self.img_height * 0.8)
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s2 = int(self.img_width / len(code))
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return int(min((s1, s2)) + max((s1, s2)) * 0.05)
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s2 = int(self.img_width/len(self.code))
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return int(min((s1, s2)) + max((s1, s2))*0.05)
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def _get_words(self):
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""" words list
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"""
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# TODO 扩充单词表
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if self.words:
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return set(self.words)
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def _set_answer(self, answer):
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"""
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设置答案和过期时间
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"""
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self.django_request.session[self.session_key] = str(answer)
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self.django_request.session[self.captcha_expires_time] = time.time() + 60
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def _make_code(self):
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def _generate(self):
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# 英文单词验证码
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def word():
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code = random.sample(self._get_words(), 1)[0]
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self._set_answer(code)
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return code
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# 数字公式验证码
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def number():
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m, n = 1, 50
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x = random.randrange(m, n)
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y = random.randrange(m, n)
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r = random.randrange(0, 2)
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if r == 0:
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code = "%s - %s = ?" % (x, y)
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z = x - y
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else:
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code = "%s + %s = ?" % (x, y)
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z = x + y
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self._set_answer(z)
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return code
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fun = eval(self.mode.lower())
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return fun()
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def get(self):
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""" return captcha image bytes
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"""
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生成随机数或随机字符串
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# font color
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self.font_color = ['black', 'darkblue', 'darkred']
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# background color
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self.background = (random.randrange(230, 255), random.randrange(230, 255), random.randrange(230, 255))
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# font path
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self.font_path = os.path.join(current_path, 'timesbi.ttf') # or Menlo.ttc
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self.django_request.session[self.session_key] = ''
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im = Image.new('RGB', (self.img_width, self.img_height), self.background)
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self.code = self._generate()
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# set font size automaticly
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self.font_size = self._get_font_size()
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# creat
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draw = ImageDraw.Draw(im)
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# draw noisy point/line
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if self.mode == 'word':
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c = int(8/len(self.code)*3) or 3
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elif self.mode == 'number':
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c = 4
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for i in range(random.randrange(c-2, c)):
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line_color = (random.randrange(0, 255), random.randrange(0, 255), random.randrange(0, 255))
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xy = (random.randrange(0, int(self.img_width*0.2)), random.randrange(0, self.img_height),
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random.randrange(int(3*self.img_width/4), self.img_width), random.randrange(0, self.img_height))
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draw.line(xy, fill=line_color, width=int(self.font_size*0.1))
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# main part
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j = int(self.font_size*0.3)
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k = int(self.font_size*0.5)
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x = random.randrange(j, k)
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for i in self.code:
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# 上下抖动量,字数越多,上下抖动越大
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m = int(len(self.code))
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y = random.randrange(1, 3)
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if i in ('+', '=', '?'):
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# 对计算符号等特殊字符放大处理
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m = ceil(self.font_size*0.8)
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else:
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# 字体大小变化量,字数越少,字体大小变化越多
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m = random.randrange(0, int(45 / self.font_size) + int(self.font_size/5))
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self.font = ImageFont.truetype(self.font_path.replace('\\', '/'), self.font_size + int(ceil(m)))
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draw.text((x, y), i, font=self.font, fill=random.choice(self.font_color))
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x += self.font_size*0.9
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del x
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del draw
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with BytesIO() as buf:
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im.save(buf, 'gif')
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buf_str = buf.getvalue()
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return buf_str
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def validate(self, code):
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""" user input validate
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"""
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string = random.sample("abcdefghkmnpqrstuvwxyzABCDEFGHGKMNOPQRSTUVWXYZ23456789", 4)
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self._set_answer("".join(string))
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return string
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def display(self):
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"""
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生成验证码图片
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"""
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background = (random.randrange(200, 255), random.randrange(200, 255), random.randrange(200, 255))
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code_color = (random.randrange(0, 50), random.randrange(0, 50), random.randrange(0, 50), 255)
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font_path = os.path.join(os.path.normpath(os.path.dirname(__file__)), "timesbi.ttf")
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image = Image.new("RGB", (self.img_width, self.img_height), background)
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code = self._make_code()
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font_size = self._get_font_size(code)
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draw = ImageDraw.Draw(image)
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# x是第一个字母的x坐标
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x = random.randrange(int(font_size * 0.3), int(font_size * 0.5))
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for i in code:
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# 字符y坐标
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y = random.randrange(1, 7)
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# 随机字符大小
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font = ImageFont.truetype(font_path.replace("\\", "/"), font_size + random.randrange(-3, 7))
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draw.text((x, y), i, font=font, fill=code_color)
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# 随机化字符之间的距离 字符粘连可以降低识别率
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x += font_size * random.randrange(6, 8) / 10
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buf = BytesIO()
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image.save(buf, "gif")
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self.django_request.session[self.session_key] = "".join(code)
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return HttpResponse(buf.getvalue(), "image/gif")
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def check(self, code):
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"""
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检查用户输入的验证码是否正确
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"""
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_code = self.django_request.session.get(self.session_key) or ""
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if not _code:
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return False
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expires_time = self.django_request.session.get(self.captcha_expires_time) or 0
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# 注意 如果验证之后不清除之前的验证码的话 可能会造成重复验证的现象
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del self.django_request.session[self.session_key]
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del self.django_request.session[self.captcha_expires_time]
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if _code.lower() == str(code).lower() and time.time() < expires_time:
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return True
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else:
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if not code:
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return False
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code = code.strip()
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_code = self.django_request.session.get(self.session_key) or ''
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self.django_request.session[self.session_key] = ''
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return _code.lower() == str(code).lower()
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@ -1,7 +1,11 @@
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from django.http import HttpResponse
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from base64 import b64encode
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from utils.captcha import Captcha
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from . import Captcha
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from ..api import APIView
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def show_captcha(request):
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return HttpResponse(Captcha(request).display(), content_type="image/gif")
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class CaptchaAPIView(APIView):
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def get(self, request):
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img_prefix = "data:image/png;base64,"
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img = img_prefix + b64encode(Captcha(request).get()).decode("utf-8")
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return self.success(img)
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