[797] | 1 | import os |
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| 2 | import re |
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| 3 | import math |
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[2180] | 4 | try: |
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| 5 | import hashlib as md5 |
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| 6 | except ImportError: |
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| 7 | import md5 |
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[797] | 8 | from string import atoi |
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| 9 | from random import randint |
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| 10 | |
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| 11 | from DateTime import DateTime |
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| 12 | |
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[1954] | 13 | from quintagroup.captcha.core.data import basic_english |
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| 14 | from quintagroup.captcha.core.config import * |
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[797] | 15 | |
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| 16 | try: |
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| 17 | import Crypto.Cipher.DES as Crypto |
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| 18 | except: |
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| 19 | import Crypto |
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| 20 | |
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[1874] | 21 | def encrypt1(s): |
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[2180] | 22 | return md5.md5(s).hexdigest().upper() |
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[1874] | 23 | |
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[797] | 24 | def getTransform(x, y, a, p, o): |
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| 25 | return (math.sin( (y+o[0])*p )*a + x, math.sin( (x+o[1])*p )*a + y) |
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| 26 | |
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| 27 | def gen_captcha(**kwargs): |
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| 28 | """Generate a captcha image""" |
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[3097] | 29 | try: |
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| 30 | from App import ImageFile |
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| 31 | except ImportError: |
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| 32 | import ImageFile |
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| 33 | from PIL import Image |
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| 34 | from PIL import ImageFont |
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| 35 | from PIL import ImageDraw |
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| 36 | from PIL import ImageFilter |
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[797] | 37 | import random |
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| 38 | from PIL import ImageFile as pyImageFile |
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| 39 | import sys |
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| 40 | sys.modules['ImageFile'] = pyImageFile |
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| 41 | from cStringIO import StringIO |
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| 42 | |
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| 43 | text = kwargs.get('text', None) |
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| 44 | fnt_sz = kwargs.get('size', DEFAULT_IMAGE_SIZE) |
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| 45 | bkground = kwargs.get('bkground', DEFAULT_BG) |
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| 46 | font_color = kwargs.get('font_color', DEFAULT_FONT_COLOR) |
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| 47 | distortion = kwargs.get('distortion', DEFAULT_DISTORTION) |
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| 48 | |
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| 49 | period = distortion[0] |
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| 50 | amplitude = distortion[1] |
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| 51 | offset = distortion[2] |
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| 52 | |
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| 53 | outFile = StringIO() |
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| 54 | |
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| 55 | DATA_PATH = os.path.abspath(os.path.dirname(__file__)) + '/data' |
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| 56 | FONT_PATH = DATA_PATH + '/fonts' |
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| 57 | |
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| 58 | #select font for captcha text |
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| 59 | ALL_FONTS=('Bd', 'It', 'MoBI', 'Mono', 'Se', 'BI', 'MoBd', 'MoIt', 'SeBd', '') |
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| 60 | rand_font = random.choice(ALL_FONTS) |
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| 61 | font = ImageFont.truetype(FONT_PATH+'/vera/Vera%s.ttf'%rand_font, fnt_sz) |
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| 62 | textSize = font.getsize(text) |
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| 63 | |
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| 64 | #------------------------------render background1 ----------------------- |
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| 65 | image = Image.new('RGB', (textSize[0]+7,textSize[1]+7), bkground) |
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| 66 | image.paste(bkground) |
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| 67 | #------------------------------render Text2 ------------------------ |
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| 68 | draw = ImageDraw.Draw(image) |
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| 69 | alignment = (random.uniform(0,1), random.uniform(0,1)) |
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| 70 | x = int((image.size[0] - textSize[0]) * alignment[0] + 0.5) |
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| 71 | y = int((image.size[1] - textSize[1]) * alignment[1] + 0.5) |
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| 72 | |
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| 73 | draw.text((x,y), text, font=font, fill=font_color) |
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| 74 | |
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| 75 | #------------------------------render Distortion ----------------------- |
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| 76 | r = 1 |
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| 77 | xPoints = image.size[0] / r + 2 |
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| 78 | yPoints = image.size[1] / r + 2 |
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| 79 | |
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| 80 | # Create a list of arrays with transformed points |
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| 81 | xRows = [] |
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| 82 | yRows = [] |
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| 83 | for j in xrange(yPoints): |
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| 84 | xRow = [] |
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| 85 | yRow = [] |
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| 86 | for i in xrange(xPoints): |
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| 87 | x, y = getTransform(i*r, j*r, amplitude, period, offset) |
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| 88 | |
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| 89 | # Clamp the edges so we don't get black undefined areas |
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| 90 | x = max(0, min(image.size[0]-1, x)) |
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| 91 | y = max(0, min(image.size[1]-1, y)) |
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| 92 | |
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| 93 | xRow.append(x) |
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| 94 | yRow.append(y) |
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| 95 | xRows.append(xRow) |
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| 96 | yRows.append(yRow) |
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| 97 | |
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| 98 | # Create the mesh list, with a transformation for |
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| 99 | # each square between points on the grid |
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| 100 | mesh = [] |
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| 101 | for j in xrange(yPoints-1): |
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| 102 | for i in xrange(xPoints-1): |
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| 103 | mesh.append(( |
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| 104 | # Destination rectangle |
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| 105 | (i*r, j*r, |
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| 106 | (i+1)*r, (j+1)*r), |
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| 107 | # Source quadrilateral |
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| 108 | (xRows[j ][i ], yRows[j ][i ], |
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| 109 | xRows[j+1][i ], yRows[j+1][i ], |
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| 110 | xRows[j+1][i+1], yRows[j+1][i+1], |
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| 111 | xRows[j ][i+1], yRows[j ][i+1]), |
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| 112 | )) |
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| 113 | |
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| 114 | img = image.transform(image.size, Image.MESH, mesh, Image.BILINEAR) |
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| 115 | |
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| 116 | # save the image to a file |
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| 117 | img.save(outFile, format='jpeg') |
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| 118 | outFile.seek(0) |
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| 119 | src = outFile.read() |
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| 120 | size = len(src) |
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| 121 | sys.modules['ImageFile'] = ImageFile |
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| 122 | return {'src':src, 'size':size} |
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| 123 | |
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| 124 | |
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| 125 | def getWord(index): |
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| 126 | words = basic_english.words.split() |
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| 127 | return words[index] |
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| 128 | |
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| 129 | def getIndex(word): |
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| 130 | words = basic_english.words.split() |
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| 131 | try: |
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| 132 | res = words.index(word) |
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| 133 | except ValueError: |
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| 134 | res = getLen()+1 |
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| 135 | return res |
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| 136 | |
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[853] | 137 | def getCaptchasCount(dynamic): |
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| 138 | if dynamic: |
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[797] | 139 | return len(basic_english.words.split()) |
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[853] | 140 | else: |
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| 141 | return CAPTCHAS_COUNT |
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[797] | 142 | |
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| 143 | def formKey(num): |
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| 144 | def normalize(s): |
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| 145 | return (not len(s)%8 and s) or normalize(s+str(randint(0, 9))) |
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| 146 | |
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| 147 | return normalize('%s_%i_'%(str(DateTime().timeTime()), num)) |
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| 148 | |
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| 149 | def encrypt(key, s): |
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| 150 | return toHex(Crypto.new(key).encrypt(s)) |
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| 151 | |
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| 152 | def decrypt(key, s): |
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| 153 | return Crypto.new(key).decrypt(toStr(s)) |
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| 154 | |
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| 155 | def parseKey(s): |
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| 156 | ps = re.match('^(.+?)_(.+?)_', s) |
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| 157 | if ps is None: |
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| 158 | return {'date': '', 'key': ''} |
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| 159 | return {'date': ps.group(1), 'key':ps.group(2)} |
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| 160 | |
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| 161 | def toHex(s): |
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| 162 | lst = [] |
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| 163 | for ch in s: |
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| 164 | hv = hex(ord(ch)).replace('0x', '') |
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| 165 | if len(hv) == 1: |
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| 166 | hv = '0'+hv |
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| 167 | lst.append(hv) |
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| 168 | |
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| 169 | return reduce(lambda x,y:x+y, lst) |
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| 170 | |
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| 171 | def toStr(s): |
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| 172 | return s and chr(atoi(s[:2], base=16)) + toStr(s[2:]) or '' |
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