Make failed request for captcha/bot form show a little error text.
Make CHALLENGE_INCLUDES_IP "1" = on, anything else = off instead of needing to be unset.
- memory and time params customisable as well as "difficulty", default 1 iteration, 6000KB, 3 difficulty.
- updated the noscript bash method to work with argon2
- works in webworkers or main thread, capped at 8 threads (doesn't seem to crash firefox anymore -- we could go higher)
Still TODO actually converting it to argon, but should be straightforward from this point.
Another advantage of making POW check use POST is a better noscript experience. We now provide a box and "submit" button, so they don't have to mess with setting a cookie.
- Move to new scheme with some hashing, sigs, and a random user key. close#13
- Change to sha256 rather than sha1 (temporary, but i guess its slightly more secure which is nice for now) ref #10
- Change POW output checked value
- Add lib for randombytes, udpate lua sha lib
- Remove outdated difficulty checks in frontend (was hardcoded 0 anyway) and since algo change is coming soon, there is no need to keep it
- Reduce the default concurrency of the frontend script to 2 threads because any higher seems to crash firefox (and its quick enough even with 2 threads anyway)
- Remove the footerlogo from challenge and maintenance page, and update the link
global override does POW only (for now --or can be easily changed for captcha+pow) until i make that customisable level too
no more confusing inverted map
use maps correctly as k:v
cleaned up some stuff
added comments
add a salt to the generate_secret function -- that was kinda important right? lol
just pass through to `end` if not POST or GET
make it not use calls to hostname and dig in lua scripts, use haproxy backend resolving instead
improve the template a lot and make it theme-matched to my site and similar to ngx_http_js_challenge robot page
fix various bugs
add on-demand global / per-domain ddos protection enabling
add automatic redirect from captcha page back to the requested source
prettify the captcha page
