slowdown.captcha – Captcha generator¶
This module provides a captcha generator implementation for high concurrent services.
Typically, each request generates a captcha. However, this module generates a pool of captcha ahead, it’s not possible to create captcha at each time. The captcha pool refreshes over time.
Example:
>>> c = \
... Captcha(
... text_len=4, # the length of the verification code
... # the default is 4
...
... cache_size=60, # the size of captcha pool
... # the default is 60
...
... expiration_time=90, # the expiration time of the captcha
... # the default is 90
...
... image_format= 'jpeg' # the default is 'jpeg'
... )
>>> media = c.new()
>>> media.text # the verification code
7E8a
>>> media.get_img(alt='mycaptcha')
<img src="data:image/jpeg;base64,ZXhhbXBsZQ==' alt='mycaptcha' />
>>> f'<img src="{media.img_src}" />'
<img src="data:image/jpeg;base64,ZXhhbXBsZQ==' />
>>> f'<img src="data:image/jpeg;base64,{media.image_base64}">'
<img src="data:image/jpeg;base64,ZXhhbXBsZQ==' />
>>> with open('mycaptcha.jpeg', 'w') as file_out: # save to a file
>>> file_out.write(media.image)
-
class
slowdown.captcha.Captcha(text_len: int = - 1, cache_size: int = - 1, expiration_time: int = - 1, image_format: str = 'jpeg') → Captcha¶ Captcha generator.
-
class
slowdown.captcha.Media(text, expiration_time, image_generator, image_format)¶ Captcha data holder.
-
property
image¶ The raw data of the captcha image.
- Return type
bytes
-
property
image_base64¶ The base64 encoded image.
- Return type
str
-
property
img_src¶ The URL that contains the captcha image for the HTML IMG tag’s src attribute.
- Return type
str
-
get_img(alt: str = None) → str¶ Returns a HTML IMG tag that contains the captcha image.
-
property
img¶ get_img(alt:str=None) -> str
Returns a HTML IMG tag that contains the captcha image.
-
property