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File: src/python/SimpleCaptcha.py

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File: src/python/SimpleCaptcha.py
Role: Auxiliary data
Content type: text/plain
Description: Auxiliary data
Class: Simple PHP Captcha Library
Show images to verify humans with math expressions
Author: By
Last change: v.2.6.0

* custom pattern callback instead of imagedata
Date: 2 months ago
Size: 94,385 bytes
 

Contents

Class file image Download
## # SimpleCaptcha # Simple image-based macthematical captcha # # @version 2.6.0 # https://github.com/foo123/simple-captcha # ## import math, random, base64, hmac, hashlib, zlib, struct class SimpleCaptcha: """ SimpleCaptcha https://github.com/foo123/simple-captcha """ VERSION = '2.6.0' def __init__(self): self.captcha = None self.hmac = None self.opts = {} self.option('secret_key', 'SECRET_KEY') self.option('secret_salt', 'SECRET_SALT_') self.option('difficulty', 1) # 0 (very easy) to 3 (more difficult) self.option('distortion_type', 1) # distortion type: 1: position distortion, 2: scale distortion self.option('distortion', None) # distortion amplitudes by difficulty self.option('num_terms', 2) # default self.option('max_num_terms', -1) # default, same as num_terms self.option('min_term', 1) # default self.option('max_term', 20) # default self.option('has_multiplication', True) # default self.option('has_division', True) # default self.option('has_equal_sign', True) # default self.option('color', 0x121212) # text color self.option('background', 0xffffff) # background color def option(self, *args): nargs = len(args) if 1 == nargs: key = str(args[0]) return self.opts[key] if key in self.opts else None elif 1 < nargs: key = str(args[0]) val = args[1] self.opts[key] = val return self def getCaptcha(self): if not self.captcha: self.generate() return self.captcha def getHash(self): if not self.captcha: self.generate() return self.hmac def reset(self): self.captcha = None self.hmac = None return self def validate(self, answer = None, hmac = None): if (answer is None) or (hmac is None): return False hash = createHash(str(self.option('secret_key')), str(self.option('secret_salt') if self.option('secret_salt') else '') + str(answer)) return hash_equals(hash, hmac) def generate(self): difficulty = min(3, max(0, int(self.option('difficulty')))) distortion_type = min(2, max(0, self.option('distortion_type'))) distortion = self.option('distortion') num_terms = max(1, int(self.option('num_terms'))) max_num_terms = int(self.option('max_num_terms')) min_term = max(0, int(self.option('min_term'))) max_term = max(0, int(self.option('max_term'))) has_mult = bool(self.option('has_multiplication')) has_div = bool(self.option('has_division')) has_equal = bool(self.option('has_equal_sign')) color = self.option('color') background = self.option('background') if (not isinstance(color, list)) and (not callable(color)): color = [color] if (not isinstance(background, list)) and (not callable(background)): background = [background] if isinstance(color, list): color = list(map(lambda x: int(x), color)) if isinstance(background, list): background = list(map(lambda x: int(x), background)) if max_num_terms > num_terms: num_terms = rand(num_terms, max_num_terms) # generate mathematical formula formula, result = self.formula(num_terms, min_term, max_term, has_mult, has_div, has_equal, difficulty) # compute hmac of result self.hmac = createHash(str(self.option('secret_key')), str(self.option('secret_salt') if self.option('secret_salt') else '') + str(result)) # create image captcha with formula depending on difficulty captcha, width, height = self.image(formula, color, background, difficulty, distortion_type, distortion) # output image self.captcha = imagepng(captcha, width, height) return self def formula(self, terms, min, max, has_mult, has_div, has_equal, difficulty): # generate mathematical formula formula = [] result = 0 factor = 0 divider = 0 for i in range(terms): x = rand(min, max) if (result > x) and rand(0, 1): # randomly use plus or minus operator x = -x elif has_mult and (x <= 10) and rand(0, 1): # randomly use multiplication factor factor = rand(2, 3) elif has_div and (0 == x % 2) and rand(0, 1): # randomly use division factor divider = rand(2, 3) if 0 == x % 3 else 2 if 0 < factor: result += x * factor if 0 > x: formula.append('-') formula.extend(split(abs(x))) formula.append('') formula.extend(split(factor)) else: if 0 < i: formula.append('+') formula.extend(split(x)) formula.append('') formula.extend(split(factor)) elif 0 < divider: result += math.floor(x / divider) if 0 > x: formula.append('-') formula.extend(split(abs(x))) formula.append('') formula.extend(split(divider)) else: if 0 < i: formula.append('+') formula.extend(split(x)) formula.append('') formula.extend(split(divider)) else: result += x if 0 > x: formula.append('-') formula.extend(split(abs(x))) else: if 0 < i: formula.append('+') formula.extend(split(x)) factor = 0 divider = 0 if has_equal: formula.append('=') formula.append('?') return (formula, result) def image(self, chars, color, background, difficulty, distortion_type, distortion): bitmaps = _chars() cw = bitmaps['width'] ch = bitmaps['height'] n = len(chars) space = 1 x0 = 10 y0 = 10 w = n * cw + (n-1) * space + 2 * x0 h = ch + 2 * y0 wh = w*h # img bitmap imgb = [0] * wh img = [0] * (wh << 2) x1 = 0 y1 = h/2 x2 = w-1 y2 = h/2 x = 0 y = 0; j = 0; for i in range(wh): if x >= w: x = 0 y += 1 c = colorAt(x, y, background, x1, y1, x2, y2) j = i << 2; img[j + 0] = c[0] img[j + 1] = c[1] img[j + 2] = c[2] img[j + 3] = 255 x += 1 # render chars for c in chars: charbmp = bitmaps['chars'][c]['bitmap'] x1 = 0 y1 = rand(0, ch-1) x2 = cw-1 y2 = rand(0, ch-1) for x in range(cw): for y in range(ch): alpha = charbmp[x + cw*y] if 0 < alpha: imgb[x0+x + w*(y0+y)] = alpha x0 += cw + space if (0 < difficulty) and (0 < distortion_type): if 2 == distortion_type: # create scale-distorted image data based on difficulty level phase = float(rand(0, 2)) * 3.14 / 2.0 amplitude = float(distortion[str(difficulty)]) if isinstance(distortion, dict) and (str(difficulty) in distortion) else (0.5 if 3 == difficulty else (0.25 if 2 == difficulty else 0.15)) x0 = max(0, round((w - n*(1.0+amplitude)*cw - (n-1)*space) / 2)) for k in range(n): scale = (1.0 + amplitude * math.sin(phase + 6.28 * 2 * k / n)) sw = min(w, round(scale * cw)) sh = min(h, round(scale * ch)) y0 = max(0, round((h - sh) / 2)) x1 = 0 y1 = sh/2 x2 = sw y2 = sh/2 for ys in range(sh): y = max(0, min(h-1, round(10 + ys / scale))) for xs in range(sw): x = max(0, min(w-1, round(10 + k*(cw+space) + xs / scale))) alpha = imgb[x + y*w] if 0 < alpha: alpha /= 255.0 c = colorAt(xs, ys, color, x1, y1, x2, y2) j = ((x0+xs + (y0+ys)*w) << 2) img[j ] = clamp(img[j ]*(1-alpha) + alpha*c[0]) img[j+1] = clamp(img[j+1]*(1-alpha) + alpha*c[1]) img[j+2] = clamp(img[j+2]*(1-alpha) + alpha*c[2]) x0 += space + sw else: # create position-distorted image data based on difficulty level phase = float(rand(0, 2)) * 3.14 / 2.0 amplitude = float(distortion[str(difficulty)]) if isinstance(distortion, dict) and (str(difficulty) in distortion) else (5.0 if 3 == difficulty else (3.0 if 2 == difficulty else 1.5)) yw = 0 x1 = 0 y1 = ch/2 x2 = cw y2 = ch/2 for y in range(h): y0 = y for x in range(w): x0 = x y0 = max(0, min(h-1, round(y + amplitude * math.sin(phase + 6.28 * 2.0 * x / w)))) alpha = imgb[x0 + y0*w] if 0 < alpha: alpha /= 255.0 xc = x - 10 + space - math.floor((x - 10 + space)/(cw + space))*(cw + space) yc = y - 10 c = colorAt(xc, yc, color, x1, y1, x2, y2) j = ((x + yw) << 2) img[j ] = clamp(img[j ]*(1-alpha) + alpha*c[0]) img[j+1] = clamp(img[j+1]*(1-alpha) + alpha*c[1]) img[j+2] = clamp(img[j+2]*(1-alpha) + alpha*c[2]) yw += w else: # create non-distorted image data x1 = 0 y1 = ch/2 x2 = cw y2 = ch/2 yw = 0 for y in range(h): for x in range(w): i = x + yw alpha = imgb[i] if 0 < alpha: alpha /= 255.0 # x = x0 + i*cw + (i-1)*space + xc # xc = x - x0 + space - i*(cw + space) xc = x - 10 + space - math.floor((x - 10 + space)/(cw + space))*(cw + space) yc = y - 10 c = colorAt(xc, yc, color, x1, y1, x2, y2) j = (i << 2) img[j ] = clamp(img[j ]*(1-alpha) + alpha*c[0]) img[j+1] = clamp(img[j+1]*(1-alpha) + alpha*c[1]) img[j+2] = clamp(img[j+2]*(1-alpha) + alpha*c[2]) yw += w # free memory bitmaps = None imgb = None return (img, w, h) def rand(m, M): return random.randrange(m, M+1) def split(s): return [c for c in str(s)] def hash_equals(h1, h2): n1 = len(h1) n2 = len(h2) n = max(n1, n2) res = True for i in range(n): if i >= n1: res = res and False elif i >= n2: res = res and False else: res = res and (h1[i] == h2[i]) return res def createHash(key, data): return str(hmac.new(bytes(str(key), 'utf-8'), msg=bytes(str(data), 'utf-8'), digestmod=hashlib.sha256).hexdigest()) def imagepng(img, width, height, metaData=dict()): return 'data:image/png;base64,' + base64.b64encode(PNGPacker(metaData).toPNG(img, width, height)).decode("ascii") def colorAt(x, y, colors, x1, y1, x2, y2): #if isinstance(colors, dict) and ('image' in colors) and ('width' in colors) and ('height' in colors): return patternAt(x, y, colors) if callable(colors): return colors(x, y) # linear gradient interpolation between colors dx = x2 - x1 dy = y2 - y1 vert = 0 == dx hor = 0 == dy f = 2*dx*dy l = len(colors) - 1 px = x - x1 py = y - y1 t = 0 if hor and vert else (py/dy if vert else (px/dx if hor else (px*dy + py*dx)/f)) if 0 >= t: c0 = c1 = 0 t = 0 elif 1 <= t: c0 = c1 = l t = 1 else: c0 = math.floor(l*t) c1 = c0 if l == c0 else (c0 + 1) rgb0 = colors[c0] rgb1 = colors[c1] t = (l*t - c0)/(c1 - c0) if c1 > c0 else t return [ clamp((1-t)*((rgb0 >> 16) & 255) + t*((rgb1 >> 16) & 255)), clamp((1-t)*((rgb0 >> 8) & 255) + t*((rgb1 >> 8) & 255)), clamp((1-t)*((rgb0) & 255) + t*((rgb1) & 255)) ] #def patternAt(x, y, pattern): # x = round(x) % pattern['width'] # y = round(y) % pattern['height'] # if 0 > x: x += pattern['width'] # if 0 > y: y += pattern['height'] # i = (x + y*pattern['width']) << 2 # return [ # pattern['image'][i + 0], # pattern['image'][i + 1], # pattern['image'][i + 2] # ] def _chars(): return { "fontSize": 20, "width": 12, "height": 15, "chars": { "0": { "width": 12, "height": 15, "bitmap": [ 0, 0, 0, 222, 255, 255, 255, 222, 0, 0, 0, 0, 0, 0, 222, 255, 255, 255, 255, 255, 255, 0, 0, 0, 0, 94, 255, 255, 0, 0, 0, 222, 255, 139, 0, 0, 0, 182, 255, 48, 0, 0, 0, 48, 255, 182, 0, 0, 0, 222, 255, 0, 0, 0, 0, 0, 222, 255, 0, 0, 0, 255, 222, 0, 0, 0, 0, 0, 182, 255, 48, 0, 0, 255, 222, 0, 0, 0, 0, 0, 182, 255, 48, 0, 0, 255, 222, 0, 0, 0, 0, 0, 182, 255, 48, 0, 0, 255, 222, 0, 0, 0, 0, 0, 182, 255, 48, 0, 0, 255, 222, 0, 0, 0, 0, 0, 182, 255, 48, 0, 0, 222, 255, 0, 0, 0, 0, 0, 222, 255, 0, 0, 0, 182, 255, 48, 0, 0, 0, 0, 255, 222, 0, 0, 0, 94, 255, 255, 0, 0, 0, 222, 255, 139, 0, 0, 0, 0, 255, 255, 255, 255, 255, 255, 255, 0, 0, 0, 0, 0, 0, 222, 255, 255, 255, 255, 0, 0, 0, 0 ] }, "1": { "width": 12, "height": 15, "bitmap": [ 0, 0, 0, 0, 0, 0, 255, 139, 0, 0, 0, 0, 0, 0, 0, 0, 0, 222, 255, 139, 0, 0, 0, 0, 0, 0, 0, 0, 222, 255, 255, 139, 0, 0, 0, 0, 0, 0, 94, 255, 255, 222, 255, 139, 0, 0, 0, 0, 0, 0, 222, 255, 48, 94, 255, 139, 0, 0, 0, 0, 0, 0, 0, 0, 0, 94, 255, 139, 0, 0, 0, 0, 0, 0, 0, 0, 0, 94, 255, 139, 0, 0, 0, 0, 0, 0, 0, 0, 0, 94, 255, 139, 0, 0, 0, 0, 0, 0, 0, 0, 0, 94, 255, 139, 0, 0, 0, 0, 0, 0, 0, 0, 0, 94, 255, 139, 0, 0, 0, 0, 0, 0, 0, 0, 0, 94, 255, 139, 0, 0, 0, 0, 0, 0, 0, 0, 0, 94, 255, 139, 0, 0, 0, 0, 0, 0, 0, 0, 0, 94, 255, 139, 0, 0, 0, 0, 0, 0, 0, 0, 0, 94, 255, 139, 0, 0, 0, 0, 0, 0, 0, 0, 0, 94, 255, 139, 0, 0, 0, 0 ] }, "2": { "width": 12, "height": 15, "bitmap": [ 0, 0, 0, 255, 255, 255, 255, 182, 0, 0, 0, 0, 0, 48, 255, 255, 255, 255, 255, 255, 255, 0, 0, 0, 0, 222, 255, 139, 0, 0, 0, 222, 255, 139, 0, 0, 0, 255, 182, 0, 0, 0, 0, 48, 255, 222, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 222, 0, 0, 0, 0, 0, 0, 0, 0, 0, 48, 255, 182, 0, 0, 0, 0, 0, 0, 0, 0, 0, 139, 255, 94, 0, 0, 0, 0, 0, 0, 0, 0, 94, 255, 182, 0, 0, 0, 0, 0, 0, 0, 0, 94, 255, 222, 0, 0, 0, 0, 0, 0, 0, 0, 94, 255, 222, 0, 0, 0, 0, 0, 0, 0, 0, 182, 255, 222, 0, 0, 0, 0, 0, 0, 0, 0, 222, 255, 182, 0, 0, 0, 0, 0, 0, 0, 0, 182, 255, 182, 0, 0, 0, 0, 0, 0, 0, 0, 48, 255, 255, 255, 255, 255, 255, 255, 255, 255, 0, 0, 94, 255, 255, 255, 255, 255, 255, 255, 255, 255, 0, 0 ] }, "3": { "width": 12, "height": 15, "bitmap": [ 0, 0, 0, 222, 255, 255, 255, 139, 0, 0, 0, 0, 0, 0, 255, 255, 255, 255, 255, 255, 182, 0, 0, 0, 0, 139, 255, 182, 0, 0, 0, 255, 255, 48, 0, 0, 0, 222, 255, 0, 0, 0, 0, 139, 255, 139, 0, 0, 0, 0, 0, 0, 0, 0, 0, 139, 255, 94, 0, 0, 0, 0, 0, 0, 0, 0, 48, 255, 255, 0, 0, 0, 0, 0, 0, 0, 139, 255, 255, 222, 0, 0, 0, 0, 0, 0, 0, 0, 139, 255, 255, 255, 255, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 94, 255, 222, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 222, 255, 48, 0, 0, 0, 0, 0, 0, 0, 0, 0, 182, 255, 48, 0, 0, 255, 222, 0, 0, 0, 0, 0, 222, 255, 0, 0, 0, 182, 255, 139, 0, 0, 0, 139, 255, 182, 0, 0, 0, 0, 255, 255, 255, 255, 255, 255, 255, 0, 0, 0, 0, 0, 0, 222, 255, 255, 255, 182, 0, 0, 0, 0 ] }, "4": { "width": 12, "height": 15, "bitmap": [ 0, 0, 0, 0, 0, 0, 94, 255, 139, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 255, 139, 0, 0, 0, 0, 0, 0, 0, 0, 139, 255, 255, 139, 0, 0, 0, 0, 0, 0, 0, 48, 255, 182, 255, 139, 0, 0, 0, 0, 0, 0, 0, 222, 182, 94, 255, 139, 0, 0, 0, 0, 0, 0, 139, 255, 48, 94, 255, 139, 0, 0, 0, 0, 0, 48, 255, 139, 0, 94, 255, 139, 0, 0, 0, 0, 0, 222, 222, 0, 0, 94, 255, 139, 0, 0, 0, 0, 139, 255, 48, 0, 0, 94, 255, 139, 0, 0, 0, 48, 255, 139, 0, 0, 0, 94, 255, 139, 0, 0, 0, 139, 255, 255, 255, 255, 255, 255, 255, 255, 255, 48, 0, 139, 255, 255, 255, 255, 255, 255, 255, 255, 255, 48, 0, 0, 0, 0, 0, 0, 0, 94, 255, 139, 0, 0, 0, 0, 0, 0, 0, 0, 0, 94, 255, 139, 0, 0, 0, 0, 0, 0, 0, 0, 0, 94, 255, 139, 0, 0, 0 ] }, "5": { "width": 12, "height": 15, "bitmap": [ 0, 0, 94, 255, 255, 255, 255, 255, 255, 139, 0, 0, 0, 0, 182, 255, 255, 255, 255, 255, 255, 139, 0, 0, 0, 0, 222, 222, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 182, 0, 0, 0, 0, 0, 0, 0, 0, 0, 48, 255, 139, 0, 0, 0, 0, 0, 0, 0, 0, 0, 94, 255, 94, 255, 255, 255, 222, 0, 0, 0, 0, 0, 139, 255, 255, 255, 255, 255, 255, 255, 0, 0, 0, 0, 182, 255, 139, 0, 0, 0, 94, 255, 182, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 222, 255, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 182, 255, 48, 0, 0, 0, 0, 0, 0, 0, 0, 0, 182, 255, 48, 0, 0, 255, 222, 0, 0, 0, 0, 0, 222, 255, 0, 0, 0, 182, 255, 139, 0, 0, 0, 94, 255, 139, 0, 0, 0, 0, 255, 255, 255, 255, 255, 255, 222, 0, 0, 0, 0, 0, 0, 222, 255, 255, 255, 182, 0, 0, 0, 0 ] }, "6": { "width": 12, "height": 15, "bitmap": [ 0, 0, 0, 94, 255, 255, 255, 222, 0, 0, 0, 0, 0, 0, 182, 255, 255, 255, 255, 255, 255, 0, 0, 0, 0, 94, 255, 182, 0, 0, 0, 182, 255, 139, 0, 0, 0, 222, 255, 48, 0, 0, 0, 0, 255, 222, 0, 0, 0, 255, 182, 0, 0, 0, 0, 0, 0, 0, 0, 0, 48, 255, 139, 0, 255, 255, 255, 222, 0, 0, 0, 0, 94, 255, 222, 255, 255, 255, 255, 255, 255, 0, 0, 0, 94, 255, 255, 222, 0, 0, 0, 139, 255, 182, 0, 0, 94, 255, 255, 0, 0, 0, 0, 0, 222, 255, 0, 0, 94, 255, 182, 0, 0, 0, 0, 0, 182, 255, 48, 0, 48, 255, 222, 0, 0, 0, 0, 0, 182, 255, 48, 0, 0, 255, 255, 48, 0, 0, 0, 0, 222, 255, 0, 0, 0, 139, 255, 222, 0, 0, 0, 139, 255, 182, 0, 0, 0, 0, 222, 255, 255, 255, 255, 255, 255, 0, 0, 0, 0, 0, 0, 139, 255, 255, 255, 182, 0, 0, 0, 0 ] }, "7": { "width": 12, "height": 15, "bitmap": [ 0, 255, 255, 255, 255, 255, 255, 255, 255, 255, 48, 0, 0, 255, 255, 255, 255, 255, 255, 255, 255, 255, 48, 0, 0, 0, 0, 0, 0, 0, 0, 139, 255, 139, 0, 0, 0, 0, 0, 0, 0, 0, 48, 255, 222, 0, 0, 0, 0, 0, 0, 0, 0, 0, 182, 255, 48, 0, 0, 0, 0, 0, 0, 0, 0, 94, 255, 182, 0, 0, 0, 0, 0, 0, 0, 0, 0, 222, 255, 48, 0, 0, 0, 0, 0, 0, 0, 0, 48, 255, 182, 0, 0, 0, 0, 0, 0, 0, 0, 0, 139, 255, 94, 0, 0, 0, 0, 0, 0, 0, 0, 0, 222, 255, 0, 0, 0, 0, 0, 0, 0, 0, 0, 48, 255, 182, 0, 0, 0, 0, 0, 0, 0, 0, 0, 94, 255, 139, 0, 0, 0, 0, 0, 0, 0, 0, 0, 182, 255, 48, 0, 0, 0, 0, 0, 0, 0, 0, 0, 222, 255, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 222, 255, 0, 0, 0, 0, 0, 0, 0 ] }, "8": { "width": 12, "height": 15, "bitmap": [ 0, 0, 0, 182, 255, 255, 255, 182, 0, 0, 0, 0, 0, 0, 222, 255, 255, 255, 255, 255, 222, 0, 0, 0, 0, 94, 255, 182, 0, 0, 0, 182, 255, 139, 0, 0, 0, 139, 255, 94, 0, 0, 0, 48, 255, 182, 0, 0, 0, 139, 255, 94, 0, 0, 0, 48, 255, 182, 0, 0, 0, 48, 255, 182, 0, 0, 0, 139, 255, 94, 0, 0, 0, 0, 94, 255, 255, 255, 255, 255, 94, 0, 0, 0, 0, 0, 182, 255, 255, 255, 255, 255, 182, 0, 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255, 255, 255, 255, 139, 0, 0, 0, 0, 0, 0, 222, 255, 255, 255, 94, 0, 0, 0, 0 ] }, "+": { "width": 12, "height": 10, "bitmap": [ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 222, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 222, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 222, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 222, 0, 0, 0, 0, 0, 0, 222, 255, 255, 255, 255, 255, 255, 255, 255, 182, 0, 0, 222, 255, 255, 255, 255, 255, 255, 255, 255, 182, 0, 0, 0, 0, 0, 0, 255, 222, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 222, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 222, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 222, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ] }, "-": { "width": 7, "height": 2, "bitmap": [ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 222, 255, 255, 255, 255, 182, 0, 0, 0, 0, 0, 0, 222, 255, 255, 255, 255, 182, 0, 0, 0, 0, 0, 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94, 0, 0, 0, 0, 0 ] } } } # PNG utilities PNG_SIGNATURE = b"\x89\x50\x4e\x47\x0d\x0a\x1a\x0a" # color-type bits COLORTYPE_GRAYSCALE = 0 COLORTYPE_PALETTE = 1 COLORTYPE_COLOR = 2 COLORTYPE_ALPHA = 4 # e.g. grayscale and alpha # color-type combinations COLORTYPE_PALETTE_COLOR = 3 COLORTYPE_COLOR_ALPHA = 6 COLORTYPE_TO_BPP_MAP = { '0': 1, '2': 3, '3': 1, '4': 2, '6': 4 } GAMMA_DIVISION = 100000 def clamp(value): return max(0, min(255, round(value))) def paethPredictor(left, above, upLeft): paeth = left + above - upLeft pLeft = abs(paeth - left) pAbove = abs(paeth - above) pUpLeft = abs(paeth - upLeft) if pLeft <= pAbove and pLeft <= pUpLeft: return left if pAbove <= pUpLeft: return above return upLeft def filterNone(pxData, pxPos, byteWidth, rawData, rawPos, bpp): rawData[rawPos:rawPos+byteWidth] = pxData[pxPos:pxPos+byteWidth] def filterSumNone(pxData, pxPos, byteWidth, bpp): sum = 0 for i in range(pxPos, pxPos + byteWidth): sum += abs(pxData[i]) return sum def filterSub(pxData, pxPos, byteWidth, rawData, rawPos, bpp): for x in range(byteWidth): left = pxData[pxPos + x - bpp] if x >= bpp else 0 val = pxData[pxPos + x] - left rawData[rawPos + x] = ubyte(val) def filterSumSub(pxData, pxPos, byteWidth, bpp): sum = 0 for x in range(byteWidth): left = pxData[pxPos + x - bpp] if x >= bpp else 0 val = pxData[pxPos + x] - left sum += abs(val) return sum def filterUp(pxData, pxPos, byteWidth, rawData, rawPos, bpp): for x in range(byteWidth): up = pxData[pxPos + x - byteWidth] if pxPos > 0 else 0 val = pxData[pxPos + x] - up rawData[rawPos + x] = ubyte(val) def filterSumUp(pxData, pxPos, byteWidth, bpp): sum = 0 for x in range(pxPos, pxPos + byteWidth): up = pxData[x - byteWidth] if pxPos > 0 else 0 val = pxData[x] - up sum += abs(val) return sum def filterAvg(pxData, pxPos, byteWidth, rawData, rawPos, bpp): for x in range(byteWidth): left = pxData[pxPos + x - bpp] if x >= bpp else 0 up = pxData[pxPos + x - byteWidth] if pxPos > 0 else 0 val = pxData[pxPos + x] - ((left + up) >> 1) rawData[rawPos + x] = ubyte(val) def filterSumAvg(pxData, pxPos, byteWidth, bpp): sum = 0 for x in range(byteWidth): left = pxData[pxPos + x - bpp] if x >= bpp else 0 up = pxData[pxPos + x - byteWidth] if pxPos > 0 else 0 val = pxData[pxPos + x] - ((left + up) >> 1) sum += abs(val) return sum def filterPaeth(pxData, pxPos, byteWidth, rawData, rawPos, bpp): for x in range(byteWidth): left = pxData[pxPos + x - bpp] if x >= bpp else 0 up = pxData[pxPos + x - byteWidth] if pxPos > 0 else 0 upleft = pxData[pxPos + x - (byteWidth + bpp)] if pxPos > 0 and x >= bpp else 0 val = pxData[pxPos + x] - paethPredictor(left, up, upleft) rawData[rawPos + x] = ubyte(val) def filterSumPaeth(pxData, pxPos, byteWidth, bpp): sum = 0 for x in range(byteWidth): left = pxData[pxPos + x - bpp] if x >= bpp else 0 up = pxData[pxPos + x - byteWidth] if pxPos > 0 else 0 upleft = pxData[pxPos + x - (byteWidth + bpp)] if pxPos > 0 and x >= bpp else 0 val = pxData[pxPos + x] - paethPredictor(left, up, upleft) sum += abs(val) return sum def deflate(data, compressionLevel=-1, chunkSize=None): #chunkSize = 16*1024 if chunkSize is None else chunkSize compressor = zlib.compressobj(level=compressionLevel) zdata = compressor.compress(data) zdata += compressor.flush() return zdata def crc32(data): return zlib.crc32(data) def ubyte(value): return value & 255 def I1(value): return struct.pack('!B', value & 255) def I4(value): return struct.pack('!I', value & 0xffffffff) def i4(value): return struct.pack('!i', value) class PNGPacker: def __init__(self, options=dict()): options['deflateChunkSize'] = max(1024, int(options['deflateChunkSize'] if ('deflateChunkSize' in options) else 32 * 1024)) options['deflateLevel'] = min(9, max(0, int(options['deflateLevel'] if ('deflateLevel' in options) else 9))) options['deflateStrategy'] = min(3, max(0, int(options['deflateStrategy'] if ('deflateStrategy' in options) else 3))) options['inputHasAlpha'] = bool(options['inputHasAlpha'] if ('inputHasAlpha' in options) else True) options['bitDepth'] = 8 #int(options['bitDepth'] if 'bitDepth' in options else 8) options['colorType'] = min(6, max(0, int(options['colorType'] if ('colorType' in options) else COLORTYPE_COLOR_ALPHA))) if (options['colorType'] != COLORTYPE_COLOR) and (options['colorType'] != COLORTYPE_COLOR_ALPHA): raise Exception('option color type:' + str(options['colorType']) + ' is not supported at present') #if options['bitDepth'] != 8: # raise Exception('option bit depth:' + str(options['bitDepth']) + ' is not supported at present') self._options = options def toPNG(self, data, width, height): # Signature png = PNG_SIGNATURE # Header png += self.packIHDR(width, height) # gAMA if 'gamma' in self._options: png += self.packGAMA(self._options['gamma']) # filter data filteredData = self.filterData(data, width, height) # compress data deflateOpts = self.getDeflateOptions() compressedData = deflate(bytes(filteredData), deflateOpts['level'], deflateOpts['chunkSize']) filteredData = None # Data png += self.packIDAT(compressedData) compressedData = None # End png += self.packIEND() return png def getDeflateOptions(self): return { 'chunkSize': self._options['deflateChunkSize'], 'level': self._options['deflateLevel'], 'strategy': self._options['deflateStrategy'] } def filterData(self, data, width, height): # convert to correct format for filtering (e.g. right bpp and bit depth) # and filter pixel data return self._filter(self._bitPack(data, width, height), width, height) def packIHDR(self, width, height): IHDR = I4(width) + I4(height) IHDR += I1(self._options['bitDepth']) # bit depth IHDR += I1(self._options['colorType']) # color type IHDR += I1(0) # compression IHDR += I1(0) # filter IHDR += I1(0) # interlace return self._packChunk('IHDR', IHDR) def packGAMA(self, gamma): return self._packChunk('gAMA', I4(math.floor(float(gamma) * GAMMA_DIVISION))) def packIDAT(self, data): return self._packChunk('IDAT', data) def packIEND(self): return self._packChunk('IEND', None) def _bitPack(self, data, width, height): outHasAlpha = ('colorType' in self._options) and self._options['colorType'] == COLORTYPE_COLOR_ALPHA inputHasAlpha = ('inputHasAlpha' in self._options) and bool(self._options['inputHasAlpha']) if inputHasAlpha and outHasAlpha: return data if (not inputHasAlpha) and (not outHasAlpha): return data outBpp = 4 if outHasAlpha else 3 outData = [0] * (width * height * outBpp) inBpp = 4 if inputHasAlpha else 3 inIndex = 0 outIndex = 0 bgColor = self._options['bgColor'] if 'bgColor' in self._options else {} bgRed = clamp(bgColor['red'] if 'red' in bgColor else 255) bgGreen = clamp(bgColor['green'] if 'green' in bgColor else 255) bgBlue = clamp(bgColor['blue'] if 'blue' in bgColor else 255) for y in range(height): for x in range(width): red = data[inIndex] green = data[inIndex + 1] blue = data[inIndex + 2] if inputHasAlpha: alpha = data[inIndex + 3] if not outHasAlpha: alpha = float(alpha) / 255.0 red = (1 - alpha) * bgRed + alpha * red green = (1 - alpha) * bgGreen + alpha * green blue = (1 - alpha) * bgBlue + alpha * blue else: alpha = 255 outData[outIndex] = clamp(red) outData[outIndex + 1] = clamp(green) outData[outIndex + 2] = clamp(blue) if outHasAlpha: outData[outIndex + 3] = clamp(alpha) inIndex += inBpp outIndex += outBpp return outData def _filter(self, pxData, width, height): filters = [ filterNone, filterSub, filterUp, filterAvg, filterPaeth ] filterSums = [ filterSumNone, filterSumSub, filterSumUp, filterSumAvg, filterSumPaeth ] filterTypes = [0] # make it default #if (not 'filterType' in self._options) or (self._options['filterType'] == -1): # filterTypes = [0, 1, 2, 3, 4] #elif int(self._options['filterType']) == self._options['filterType']: # filterTypes = [self._options['filterType']] #else: # raise Exception('unrecognised filter types') bpp = COLORTYPE_TO_BPP_MAP[str(self._options['colorType'])] byteWidth = width * bpp rawPos = 0 pxPos = 0 rawData = [0] * ((byteWidth + 1) * height) sel = filterTypes[0] n = len(filterTypes) for y in range(height): if n > 1: # find best filter for this line (with lowest sum of values) min = math.inf for i in range(n): sum = filterSums[filterTypes[i]](pxData, pxPos, byteWidth, bpp) if sum < min: sel = filterTypes[i] min = sum rawData[rawPos] = sel rawPos += 1 filters[sel](pxData, pxPos, byteWidth, rawData, rawPos, bpp) rawPos += byteWidth pxPos += byteWidth return rawData def _packChunk(self, type, data = None): block = str(type).encode('ascii') length = 0 if data is not None: if isinstance(data, list): data = bytes(data) length = len(data) block += data return I4(length) + block + I4(crc32(block)) __all__ = ['SimpleCaptcha']