User feedback for missing gmp extension

[michib]

If the gmp extension is missing (see error log from #16), users should get a hint about this

[JSoko]

On Ubuntu you just have to run

sudo apt-get update && sudo apt-get upgrade
sudo apt-get install php-gmp
service apache2 restart

Works fine, but only as 2nd Factor and not as singlesignon webauthn on Nextcloud 16.0.4.1

Linux 4.15.0-58-generic #64-Ubuntu SMP Tue Aug 6 11:12:41 UTC 2019 x86_64
Apache/2.4.29 (Ubuntu) (apache2handler)
mysql 10.2.16
php 7.2.19-0ubuntu0.18.04.2
Modules loaded: Core, date, libxml, openssl, pcre, zlib, filter, hash, Reflection, SPL, sodium, session, standard, apache2handler, mysqlnd, PDO, xml, apcu, apc, bz2, calendar, ctype, curl, dom, mbstring, fileinfo, ftp, gd, gettext, gmp, iconv, igbinary, imagick, intl, json, ldap, exif, mysqli, pdo_mysql, Phar, posix, readline, redis, shmop, SimpleXML, smbclient, soap, sockets, sysvmsg, sysvsem, sysvshm, tokenizer, wddx, xmlreader, xmlrpc, xmlwriter, xsl, zip, libsmbclient, Zend OPcache

[michib]

Thank you the installation information, it's highly appreciated.

Yes it only works as second factor, that's intended. To be used for passwordless authentication, there is more work on the core of nextcloud necessary

[derritter88]

Thank you sir!

[My1]

@JSoko nice info but not the point.
the point is that the extension should maybe tell the admin that the gmp is missing rather than not telling anything and needing to dig endlessly in the logs.

[ChristophWurst]

https://help.nextcloud.com/t/api-proposal-app-provided-setup-checks/86393 would certainly help here.