OpenACS / openacs-4 / packages / acs-templating / tcl

captcha-procs.tcl

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Last Commit: 14 Nov
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Sunday 26 Jun 2022
1:06 pm

gustafn

removed code factored out to the separate "captcha" package

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  2. … 11 more files in changeset.
Wednesday 22 Jun 2022
10:42 am

antoniop

Constrain captcha width to 100% of its parent's size

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    ./captcha-procs.tcl
Monday 02 May 2022
2:03 pm

antoniop

Fix missing variable

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Thursday 28 Apr 2022
12:59 pm

antoniop

Fix typo

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Wednesday 27 Apr 2022
6:43 pm

antoniop

Provide an alternative exec-free captcha implementation using libgd and its Tcl wrapper https://github.com/flightaware/tcl.gd

This implementation will be preferred to the one using convert, when available.

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    ./captcha-procs.tcl
  2. … 1 more file in changeset.
Monday 31 Jan 2022
12:13 pm

antoniop

Compute amplitude and wavelength explicitly in pixels and make it stable with respect to the captcha size, introduce a random offset for the wave instead

Fixes acs-templating.tesseract_cannot_crack_catpcha automated test

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    ./captcha-procs.tcl
Friday 28 Jan 2022
10:28 am

antoniop

Drop the pointsize parameter, use size instead, yielding more predictable results across Imagemagik versions and more controllable in general, make the wavelength randomized in the distortion

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    ./captcha-procs.tcl
  2. … 1 more file in changeset.
Thursday 27 Jan 2022
9:18 am

antoniop

Fail when no value is specified

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    ./captcha-procs.tcl
8:26 am

antoniop

Improve behavior: invalidate the captcha when the check fails, cleanup expired captcha also when a new one is generated

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    ./captcha-procs.tcl
Wednesday 26 Jan 2022
5:06 pm

antoniop

A simple image captcha implementation:

a random text is converted to a distorted image, its checksum, together with the expected text are stored in a lookup table. Upon validation, the text input by the user is matched against the checksum to determine if the captcha is correct.

Plan is to use it downstream on certain publicly available contact forms.

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    ./captcha-procs.tcl
  2. … 8 more files in changeset.
5:06 pm

antoniop

file captcha-procs.tcl was initially added on branch oacs-5-10.

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