husio/authtest.go

## authtest.go
package main

import (
	"html/template"
	"log"
	"net/http"

	"github.com/stretchr/gomniauth"
	"github.com/stretchr/gomniauth/common"
	"github.com/stretchr/gomniauth/providers/google"
	"github.com/stretchr/objx"
)

var tmpl = template.Must(template.New("").Parse(`


{{define "header"}}
<!doctype html>
<html>
	<body>
{{end}}


{{define "footer"}}
	</body>
</html>
{{end}}

{{define "index"}}
	{{template "header" .}}
	{{if .User}}
		Logged as {{.User.Email}}. <a href="/logout">Logout</a>.
	{{else}}
		Login with <a href="/login">google account</a>.
	{{end}}
	{{template "footer" .}}
{{end}}

`))

var CurrentUser *common.User

func main() {
	gomniauth.SetSecurityKey("asjacjhf09hq0fhaoHAOSDHAsdasdsa")
	googleProvider := google.New("id", "secret", "callbackurl")
	gomniauth.WithProviders(googleProvider)

	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		ctx := map[string]interface{}{
			"User": CurrentUser,
		}
		if err := tmpl.ExecuteTemplate(w, "index", ctx); err != nil {
			log.Printf("cannot render index template: %s", err)
			http.Error(w, err.Error(), 500)
		}
	})

	http.HandleFunc("/login", func(w http.ResponseWriter, r *http.Request) {
		state := gomniauth.NewState("after", "success")
		authUrl, err := googleProvider.GetBeginAuthURL(state, nil)
		if err != nil {
			log.Printf("cannot generate login url: %s", err)
			http.Error(w, err.Error(), 500)
			return
		}
		http.Redirect(w, r, authUrl, http.StatusFound)
	})

	http.HandleFunc("/logout", func(w http.ResponseWriter, r *http.Request) {
		CurrentUser = nil
		http.Redirect(w, r, "/", http.StatusFound)
	})

	http.HandleFunc("/login/google", func(w http.ResponseWriter, r *http.Request) {
		omap, err := objx.FromURLQuery(r.URL.RawQuery)
		if err != nil {
			log.Printf("cannot parse login callback query: %s", err)
			http.Error(w, err.Error(), 500)
			return
		}

		cred, err := googleProvider.CompleteAuth(omap)
		if err != nil {
			log.Printf("cannot complete authentication: %s", err)
			http.Error(w, err.Error(), 500)
			return
		}

		user, err := googleProvider.GetUser(cred)
		if err != nil {
			log.Printf("cannot get authenticated user: %s", err)
			http.Error(w, err.Error(), 500)
			return
		}

		CurrentUser = &user
		http.Redirect(w, r, "/", http.StatusFound)
	})

	log.Fatal(http.ListenAndServe(":5000", nil))
}
	package main

	import (
	"html/template"
	"log"
	"net/http"

	"github.com/stretchr/gomniauth"
	"github.com/stretchr/gomniauth/common"
	"github.com/stretchr/gomniauth/providers/google"
	"github.com/stretchr/objx"
	)

	var tmpl = template.Must(template.New("").Parse(`


	{{define "header"}}
	<!doctype html>
	<html>
	<body>
	{{end}}


	{{define "footer"}}
	</body>
	</html>
	{{end}}

	{{define "index"}}
	{{template "header" .}}
	{{if .User}}
	Logged as {{.User.Email}}. <a href="/logout">Logout</a>.
	{{else}}
	Login with <a href="/login">google account</a>.
	{{end}}
	{{template "footer" .}}
	{{end}}

	`))

	var CurrentUser *common.User

	func main() {
	gomniauth.SetSecurityKey("asjacjhf09hq0fhaoHAOSDHAsdasdsa")
	googleProvider := google.New("id", "secret", "callbackurl")
	gomniauth.WithProviders(googleProvider)

	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
	ctx := map[string]interface{}{
	"User": CurrentUser,
	}
	if err := tmpl.ExecuteTemplate(w, "index", ctx); err != nil {
	log.Printf("cannot render index template: %s", err)
	http.Error(w, err.Error(), 500)
	}
	})

	http.HandleFunc("/login", func(w http.ResponseWriter, r *http.Request) {
	state := gomniauth.NewState("after", "success")
	authUrl, err := googleProvider.GetBeginAuthURL(state, nil)
	if err != nil {
	log.Printf("cannot generate login url: %s", err)
	http.Error(w, err.Error(), 500)
	return
	}
	http.Redirect(w, r, authUrl, http.StatusFound)
	})

	http.HandleFunc("/logout", func(w http.ResponseWriter, r *http.Request) {
	CurrentUser = nil
	http.Redirect(w, r, "/", http.StatusFound)
	})

	http.HandleFunc("/login/google", func(w http.ResponseWriter, r *http.Request) {
	omap, err := objx.FromURLQuery(r.URL.RawQuery)
	if err != nil {
	log.Printf("cannot parse login callback query: %s", err)
	http.Error(w, err.Error(), 500)
	return
	}

	cred, err := googleProvider.CompleteAuth(omap)
	if err != nil {
	log.Printf("cannot complete authentication: %s", err)
	http.Error(w, err.Error(), 500)
	return
	}

	user, err := googleProvider.GetUser(cred)
	if err != nil {
	log.Printf("cannot get authenticated user: %s", err)
	http.Error(w, err.Error(), 500)
	return
	}

	CurrentUser = &user
	http.Redirect(w, r, "/", http.StatusFound)
	})

	log.Fatal(http.ListenAndServe(":5000", nil))
	}