I’m fairly sure the issue with logging into https://www.svetandroida.cz/ through Discourse is related to the nonce being cached. The way I tested this was by clicking the “Log in with Discourse” link (https://www.svetandroida.cz/?discourse_sso=1&redirect_to=https%3A%2F%2Fwww.svetandroida.cz%2F).
The first time I did that I was redirected to https://komunita.svetandroida.cz/, created an account on the Discourse site with Gmail, then redirected back to your WordPress site as a logged in user.
I then logged out of your WordPress site and tried logging back in by clicking the “Login with Discourse” link again. This time I got the “expired nonce” error.
I then generated a login link with a random value for the discourse_sso URL parameter, for example https://www.svetandroida.cz/?discourse_sso=181253058&redirect_to=https%3A%2F%2Fwww.svetandroida.cz%2F and was able to login to your WordPress site through Discourse without any issues.
I’ve tried this a few times, both with the login link that’s generated by the plugin (https://www.svetandroida.cz/?discourse_sso=1&redirect_to=https%3A%2F%2Fwww.svetandroida.cz%2F) and with login links that have a random value set for the discourse_sso parameter. It seems that the nonce that’s being returned is being cached for at least a few minutes.
Without fully debugging the issue, I’m fairly sure you can get things to work just by adding the following to your theme’s functions.php file (it will set a random string to the discourse_sso URL parameter. This should work as long as there isn’t also “page caching” enabled on your login page.)
add_filter('wpdc_sso_client_query', 'wpdc_custom_sso_client_query' );
function wpdc_custom_sso_client_query() {
return wp_generate_password( 12, false );
}
If you do want to debug the issue, here’s what I’m seeing for a successful request. Note the Cache-Svetzitrka: STALE line. This might indicate that there’s a custom caching layer in place and that the cache was STALE for the successful request (so a fresh nonce was generated.)
Summary
Request URL:
https://www.svetandroida.cz/?discourse_sso=1&redirect_to=https%3A%2F%2Fwww.svetandroida.cz%2F
Request Method:
GET
Status Code:
302 Found
Remote Address:
93.185.102.156:443
Referrer Policy:
strict-origin-when-cross-origin
Cache-Control:
max-age=0
Cache-Svetzitrka:
STALE
Content-Length:
0
Content-Type:
text/html; charset=UTF-8
Date:
Mon, 11 Dec 2023 09:38:05 GMT
Expires:
Mon, 11 Dec 2023 09:21:47 GMT
Location:
https://komunita.svetandroida.cz/session/sso_provider?sso=bm9uY2U9MGU3NTNjYWNhNjMwNmMzNzM5M2MyODk4MjZlYzMxMjQmcmV0dXJuX3Nzb191cmw9aHR0cHMlM0ElMkYlMkZ3d3cuc3ZldGFuZHJvaWRhLmN6JTJG&sig=32ddcc85bd2dd7175f963e791cc9ac734a607355d773422d3abec6173c9f656b
Server:
nginx
Strict-Transport-Security:
max-age=10886400; includeSubdomains; preload
X-Content-Type-Options:
nosniff
X-Frame-Options:
SAMEORIGIN
X-Redirect-By:
WordPress
Here’s what I’m seeing for a failed request. The Cache-Control: no-cache, no-store line seems to indicate that the response shouldn’t be cached, but the from service worker entry in the response indicates that the response could be coming from a service worker’s cache.
Summary
Request URL:
https://www.svetandroida.cz/?discourse_sso=1&redirect_to=https%3A%2F%2Fwww.svetandroida.cz%2F
Request Method:
GET
Status Code:
302 Found (from service worker)
Referrer Policy:
strict-origin-when-cross-origin
Cache-Control:
no-cache, no-store
Content-Security-Policy:
upgrade-insecure-requests; base-uri 'self'; object-src 'none'; script-src https://komunita.svetandroida.cz/logs/ https://komunita.svetandroida.cz/sidekiq/ https://komunita.svetandroida.cz/mini-profiler-resources/ https://komunita.svetandroida.cz/assets/ https://komunita.svetandroida.cz/extra-locales/ https://komunita.svetandroida.cz/highlight-js/ https://komunita.svetandroida.cz/javascripts/ https://komunita.svetandroida.cz/plugins/ https://komunita.svetandroida.cz/theme-javascripts/ https://komunita.svetandroida.cz/svg-sprite/ https://www.google-analytics.com/analytics.js https://www.googletagmanager.com/gtag/js 'sha256-8uAKDaK4QxxCeYZl0Wxad2Nnj2tgKyA14hYBh66pnn0='; worker-src 'self' https://komunita.svetandroida.cz/assets/ https://komunita.svetandroida.cz/javascripts/ https://komunita.svetandroida.cz/plugins/; frame-ancestors 'self'; manifest-src 'self'
Content-Type:
text/html; charset=utf-8
Date:
Mon, 11 Dec 2023 09:38:05 GMT
Discourse-Logged-Out:
1
Location:
https://komunita.svetandroida.cz/login
Referrer-Policy:
strict-origin-when-cross-origin
Server:
nginx
Set-Cookie:
sso_payload=sso%3Dbm9uY2U9MGU3NTNjYWNhNjMwNmMzNzM5M2MyODk4MjZlYzMxMjQmcmV0dXJuX3Nzb191cmw9aHR0cHMlM0ElMkYlMkZ3d3cuc3ZldGFuZHJvaWRhLmN6JTJG%26sig%3D32ddcc85bd2dd7175f963e791cc9ac734a607355d773422d3abec6173c9f656b; path=/; SameSite=Lax
Set-Cookie:
_forum_session=kGW2K6gafsjS90qQMEmxzjggEYo4tZPZe76XZNVro34ilyuuHsaYt2nEzC9h6tfiSBmY9XoDdxh1SV3S8n%2BwqrbsD58UvJBz6khjm%2Fty83ufkgry8daHDdyoTfFwQOjAbXrWeGIwkS4edGY1XetNwXhu%2FNJUghqmq8BEUycBt7098KUO%2BmRYDl5iSL0FNhUzo5Hc7xwRg0tfxuxmb%2FIyVLnbFz6IJuGB3Y95PRcU5DYIwAAny1GQbKQ23kSjgALxAThG7aA%2B7LCI9cJNWV1JRSy%2FTElDN3iugKuVpaQcrSPhV3SvQaiNH3MCfLwu6yxlp%2BZ%2BwTyw22czX8bb197z36WhlbghYtxvKYGRjONJQUagisjPpMrCAcGeTKsGB4JgnUKCtlrwIoFvaDxjec7hMo3aCnibbbkmcxWc6LvD6G2xaxkDgebe7RpvfTYdG8cn8j6rNwX3hM8la4RqZnmma0%2FQlSrfj0BjfY7lnan6TYm28vLwH%2FFfdZoRbo6JdTs5AFjCJvx9UXSjFmoXHH1R1yfAizPeKDFnpiuUs4a%2FBzWafQ%3D%3D--8PEvbWwpqBuJMSRJ--CzzhBea4mmv58a7KLEnukw%3D%3D; path=/; secure; HttpOnly; SameSite=Lax
Set-Cookie:
_t=; path=/; max-age=0; expires=Thu, 01 Jan 1970 00:00:00 GMT; SameSite=Lax
Strict-Transport-Security:
max-age=31536000
Vary:
Accept
X-Content-Type-Options:
nosniff
X-Discourse-Route:
session/sso_provider
X-Download-Options:
noopen
X-Frame-Options:
SAMEORIGIN
X-Permitted-Cross-Domain-Policies:
none
X-Request-Id:
001750b9-94f2-4bf0-8503-9d673463b91e
X-Runtime:
0.012335
X-Xss-Protection:
0