Currently is legacy but was a popular way of exposing SharePoint into external world back in the days.
Struct
typeAuthCnfgstruct {// SPSite or SPWeb URL, which is the context target for the API calls SiteURL string`json:"siteUrl"`// Username for SharePoint On-Prem,// format depends in TMG settings, can include domain or doesn't Username string`json:"username"`// User password Password string`json:"password"`}
packagemainimport ("log"// "os""github.com/koltyakov/gosip" strategy "github.com/koltyakov/gosip/auth/tmg")funcmain() {// authCnfg := &strategy.AuthCnfg{// SiteURL: os.Getenv("SPAUTH_SITEURL"),// Username: os.Getenv("SPAUTH_USERNAME"),// Password: os.Getenv("SPAUTH_PASSWORD"),// }// or using `private.json` creds source authCnfg :=&strategy.AuthCnfg{} configPath :="./config/private.json"if err := authCnfg.ReadConfig(configPath); err !=nil { log.Fatalf("unable to get config: %v", err) } client :=&gosip.SPClient{AuthCnfg: authCnfg}// use client in raw requests or bind it with Fluent API ...}