1 | import os |
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2 | from string import atoi |
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3 | import md5 |
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4 | from random import randint |
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5 | from Products.qPloneCaptchas.data import basic_english |
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6 | from Products.qPloneCaptchas.config import * |
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7 | from DateTime import DateTime |
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8 | import re |
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9 | import math |
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10 | try: |
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11 | import Crypto.Cipher.DES as Crypto |
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12 | except: |
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13 | import Crypto |
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14 | |
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15 | def encrypt1(s): |
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16 | return md5.new(s).hexdigest().upper() |
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17 | |
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18 | def getTransform(x, y, a, p, o): |
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19 | return (math.sin( (y+o[0])*p )*a + x, math.sin( (x+o[1])*p )*a + y) |
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20 | |
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21 | def gen_captcha(**kwargs): |
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22 | """Generate a captcha image""" |
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23 | import ImageFile |
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24 | import Image |
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25 | import ImageFont |
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26 | import ImageDraw |
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27 | import ImageFilter |
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28 | import random |
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29 | from PIL import ImageFile as pyImageFile |
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30 | import sys |
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31 | sys.modules['ImageFile'] = pyImageFile |
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32 | from cStringIO import StringIO |
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33 | |
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34 | text = kwargs.get('text', None) |
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35 | fnt_sz = kwargs.get('size', DEFAULT_IMAGE_SIZE) |
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36 | bkground = kwargs.get('bkground', DEFAULT_BG) |
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37 | font_color = kwargs.get('font_color', DEFAULT_FONT_COLOR) |
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38 | distortion = kwargs.get('distortion', DEFAULT_DISTORTION) |
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39 | |
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40 | period = distortion[0] |
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41 | amplitude = distortion[1] |
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42 | offset = distortion[2] |
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43 | |
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44 | outFile = StringIO() |
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45 | |
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46 | DATA_PATH = os.path.abspath(os.path.dirname(__file__)) + '/data' |
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47 | FONT_PATH = DATA_PATH + '/fonts' |
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48 | |
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49 | #select font for captcha text |
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50 | ALL_FONTS=('Bd', 'It', 'MoBI', 'Mono', 'Se', 'BI', 'MoBd', 'MoIt', 'SeBd', '') |
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51 | rand_font = random.choice(ALL_FONTS) |
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52 | font = ImageFont.truetype(FONT_PATH+'/vera/Vera%s.ttf'%rand_font, fnt_sz) |
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53 | textSize = font.getsize(text) |
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54 | |
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55 | #------------------------------render background1 ----------------------- |
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56 | image = Image.new('RGB', (textSize[0]+7,textSize[1]+7), bkground) |
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57 | image.paste(bkground) |
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58 | #------------------------------render Text2 ------------------------ |
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59 | draw = ImageDraw.Draw(image) |
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60 | alignment = (random.uniform(0,1), random.uniform(0,1)) |
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61 | x = int((image.size[0] - textSize[0]) * alignment[0] + 0.5) |
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62 | y = int((image.size[1] - textSize[1]) * alignment[1] + 0.5) |
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63 | |
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64 | draw.text((x,y), text, font=font, fill=font_color) |
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65 | |
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66 | #------------------------------render Distortion ----------------------- |
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67 | r = 1 |
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68 | xPoints = image.size[0] / r + 2 |
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69 | yPoints = image.size[1] / r + 2 |
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70 | |
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71 | # Create a list of arrays with transformed points |
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72 | xRows = [] |
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73 | yRows = [] |
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74 | for j in xrange(yPoints): |
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75 | xRow = [] |
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76 | yRow = [] |
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77 | for i in xrange(xPoints): |
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78 | x, y = getTransform(i*r, j*r, amplitude, period, offset) |
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79 | |
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80 | # Clamp the edges so we don't get black undefined areas |
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81 | x = max(0, min(image.size[0]-1, x)) |
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82 | y = max(0, min(image.size[1]-1, y)) |
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83 | |
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84 | xRow.append(x) |
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85 | yRow.append(y) |
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86 | xRows.append(xRow) |
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87 | yRows.append(yRow) |
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88 | |
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89 | # Create the mesh list, with a transformation for |
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90 | # each square between points on the grid |
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91 | mesh = [] |
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92 | for j in xrange(yPoints-1): |
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93 | for i in xrange(xPoints-1): |
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94 | mesh.append(( |
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95 | # Destination rectangle |
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96 | (i*r, j*r, |
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97 | (i+1)*r, (j+1)*r), |
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98 | # Source quadrilateral |
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99 | (xRows[j ][i ], yRows[j ][i ], |
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100 | xRows[j+1][i ], yRows[j+1][i ], |
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101 | xRows[j+1][i+1], yRows[j+1][i+1], |
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102 | xRows[j ][i+1], yRows[j ][i+1]), |
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103 | )) |
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104 | |
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105 | img = image.transform(image.size, Image.MESH, mesh, Image.BILINEAR) |
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106 | |
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107 | # save the image to a file |
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108 | img.save(outFile, format='jpeg') |
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109 | outFile.seek(0) |
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110 | src = outFile.read() |
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111 | size = len(src) |
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112 | sys.modules['ImageFile'] = ImageFile |
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113 | return {'src':src, 'size':size} |
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114 | |
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115 | |
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116 | def getWord(index): |
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117 | words = basic_english.words.split() |
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118 | return words[index] |
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119 | |
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120 | def getIndex(word): |
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121 | words = basic_english.words.split() |
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122 | try: |
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123 | res = words.index(word) |
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124 | except ValueError: |
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125 | res = getLen()+1 |
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126 | return res |
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127 | |
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128 | def getCaptchasCount(havePIL): |
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129 | def getLen(): |
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130 | return len(basic_english.words.split()) |
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131 | return havePIL and getLen() or CAPTCHAS_COUNT |
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132 | |
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133 | def formKey(num): |
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134 | def normalize(s): |
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135 | return (not len(s)%8 and s) or normalize(s+str(randint(0, 9))) |
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136 | |
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137 | return normalize('%s_%i_'%(str(DateTime().timeTime()), num)) |
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138 | |
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139 | def encrypt(key, s): |
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140 | return toHex(Crypto.new(key).encrypt(s)) |
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141 | |
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142 | def decrypt(key, s): |
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143 | return Crypto.new(key).decrypt(toStr(s)) |
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144 | |
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145 | def parseKey(s): |
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146 | ps = re.match('^(.+?)_(.+?)_', s) |
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147 | if ps is None: |
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148 | return {'date': '', 'key': ''} |
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149 | return {'date': ps.group(1), 'key':ps.group(2)} |
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150 | |
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151 | def toHex(s): |
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152 | lst = [] |
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153 | for ch in s: |
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154 | hv = hex(ord(ch)).replace('0x', '') |
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155 | if len(hv) == 1: |
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156 | hv = '0'+hv |
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157 | lst.append(hv) |
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158 | |
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159 | return reduce(lambda x,y:x+y, lst) |
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160 | |
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161 | def toStr(s): |
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162 | return s and chr(atoi(s[:2], base=16)) + toStr(s[2:]) or '' |
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