This is a simple Go web server that serves a HTML web form and stores the values that it receives via HTTP POST as JSON.
The idea behind this is to spawn an access point via hostapd and run this server on reboot when there is no internet connection available.
After the user connects to the temporary hostapd Wifi and configures the parameters, the webserver stores the values as JSON data.
The JSON data can then be read by Ansible to reconfigure settings.
As an example, the HTTP form asks for interface, SSID and PSK that can be used to reconfigure a Raspberry Pi to another Wifi.
This could be expanded with static IP configuration options.
So this webserver alone just handles the HTTP Form and plays a small but crucial part in the reconfiguration process of a SBC.
$ ./gowebform -h
Usage of gowebform:
-cert string
Specify TLS certificate file. (default "server.crt")
-html string
Specify HTML form to serve. (default "gowebform.html")
-json string
Specify JSON file to store received POST form data. (default "gowebform.json")
-key string
Specify TLS key file. (default "server.key")
-port string
Specify port for HTTPS enabled webserver. (default ":8000")
You may run tlskeygen.sh in order to create a new self-signed TLS certificate and key.