Class: FastCaptcha
- Inherits:
-
Object
- Object
- FastCaptcha
- Defined in:
- lib/fastcaptcha.rb,
ext/fastcaptcha.c
Defined Under Namespace
Classes: Challenge
Constant Summary collapse
- CHARSET =
('A'..'Z').to_a + (0..9).to_a - ['I', 1, 'O', 0, 'G']
Instance Attribute Summary collapse
-
#cache ⇒ Object
readonly
Returns the value of attribute cache.
Instance Method Summary collapse
- #cache_connection ⇒ Object
- #generate(ttl = 60, png = true, text = nil) ⇒ Object
- #hash(text) ⇒ Object
- #image(*args) ⇒ Object
-
#initialize(cache = nil, level = 1, w = 200, h = 50) ⇒ FastCaptcha
constructor
A new instance of FastCaptcha.
- #refresh(key) ⇒ Object
- #store(text, ttl) ⇒ Object
- #validate(key, response) ⇒ Object
Constructor Details
#initialize(cache = nil, level = 1, w = 200, h = 50) ⇒ FastCaptcha
Returns a new instance of FastCaptcha.
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# File 'lib/fastcaptcha.rb', line 10 def initialize cache = nil, level = 1, w = 200, h = 50 @cache = cache || cache_connection @level = level @width = w @height = h end |
Instance Attribute Details
#cache ⇒ Object (readonly)
Returns the value of attribute cache.
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# File 'lib/fastcaptcha.rb', line 8 def cache @cache end |
Instance Method Details
#cache_connection ⇒ Object
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# File 'lib/fastcaptcha.rb', line 43 def cache_connection Moneta::Memcache.new end |
#generate(ttl = 60, png = true, text = nil) ⇒ Object
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# File 'lib/fastcaptcha.rb', line 17 def generate ttl = 60, png = true, text = nil text = text || 6.times.map { CHARSET[rand(CHARSET.length)] }.join('') key = store(text.strip.upcase, ttl) Challenge.new(key, png ? image(text, @level, @width, @height) : nil) end |
#hash(text) ⇒ Object
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# File 'lib/fastcaptcha.rb', line 23 def hash text 'fastcaptcha:%s' % Digest::SHA1.hexdigest("#{text}#{Time.now.to_f}") end |
#image(*args) ⇒ Object
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# File 'ext/fastcaptcha.c', line 44
VALUE rb_captcha_image(int argc, VALUE* argv, VALUE self) {
VALUE string, lv, w, h;
rb_scan_args(argc, argv, "22", &string, &lv, &w, &h);
CvScalar c;
CvPoint *pts, pt;
CvFont font[5];
char text[2];
IplImage *img, *dst;
CvMat *out;
int i, j, x, y;
char *cstr = RSTRING_PTR(string);
int W=strlen(cstr)*30+20, H=50;
int level = NUM2INT(lv);
double sx, sy;
img = cvCreateImage(cvSize(W, H), 8, 3);
cvSet(img, cvScalarAll(255), 0);
pts = (CvPoint *)malloc(sizeof(CvPoint)*(strlen(cstr)+1));
for (i = 0; i < 5; i++) {
sx = (float)(rand()%4)*0.1 + 1.0;
sy = (float)(rand()%4)*0.1 + 1.0;
cvInitFont(&font[i], CV_FONT_HERSHEY_SIMPLEX, sx, sy, 1, 2, 8);
}
if (level > SILLY && level < HARD) {
for (i = 0; i < W; i += 5) {
c = CV_RGB(rand()%50 + 200, rand()%50 + 200, rand()%50 + 200);
cvLine(img, cvPoint(i, 0), cvPoint(i, H), c, rand()%2+1, 8, 0);
}
for (i = 0; i < H; i += 5) {
c = CV_RGB(rand()%50 + 200, rand()%50 + 200, rand()%50 + 200);
cvLine(img, cvPoint(0, i), cvPoint(W, i), c, rand()%2+1, 8, 0);
}
}
if (level >= MEDIUM) {
bgWarp(img, img);
for (i = 0; i < 10; i++) {
j = rand()%50 + 120;
pt = cvPoint(rand()%W, rand()%H);
cvEllipse(img, pt, cvSize(rand()%50+10, rand()%50+10), rand()%90, 0, 360, CV_RGB(j,j,j), 1, 8, 0);
}
}
x = rand()%40;
memset(text, 0, 2);
for (i = 0; i < strlen(cstr); i++) {
y = (H>>1) - (10 - rand()%10) + 20;
pts[i] = cvPoint(x, y - rand()%20);
text[0] = cstr[i];
c = CV_RGB(rand()%150 + 50, rand()%150 + 50, rand()%150 + 50);
cvPutText(img, text, cvPoint(x, y), &font[i%5], c);
x += 25;
pts[i+1] = cvPoint(x, y - rand()%20);
}
if (level >= HARD) {
for (i = 0; i < strlen(cstr); i++) {
c = CV_RGB(rand()%50 + 120, rand()%50 + 120, rand()%50 + 120);
cvLine(img, pts[i], pts[i+1], c, 2, 8, 0);
}
}
w = NIL_P(w) ? INT2NUM(W) : w;
h = NIL_P(h) ? INT2NUM(H) : h;
dst = cvCreateImage(cvSize(NUM2INT(w), NUM2INT(h)), 8, 3);
cvResize(img, dst, CV_INTER_CUBIC);
out = cvEncodeImage(".png", dst, 0);
VALUE imgdata = rb_str_new((const char *)out->data.ptr, out->step);
cvReleaseImage(&img);
cvReleaseImage(&dst);
cvReleaseMat(&out);
free(pts);
return imgdata;
}
|
#refresh(key) ⇒ Object
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# File 'lib/fastcaptcha.rb', line 33 def refresh key text = cache[key] text ? image(text, @level, @width, @height) : nil end |
#store(text, ttl) ⇒ Object
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# File 'lib/fastcaptcha.rb', line 27 def store text, ttl key = hash(text) cache.store(key, text, expires_in: ttl) key end |
#validate(key, response) ⇒ Object
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# File 'lib/fastcaptcha.rb', line 38 def validate key, response rv = cache[key] == response.upcase.strip rv && cache.delete(key) end |