login.go

package main
    
import (
    "fmt"
    "html/template"
    "net/http"
    "os"
    
    "github.com/gorilla/pat"
    "github.com/gorilla/sessions"
    "github.com/markbates/goth"
    "github.com/markbates/goth/gothic"
    "github.com/markbates/goth/providers/twitter"
    "sort"
)   
    
func init() {
    gothic.Store = sessions.NewFilesystemStore(os.TempDir(), []byte("goth-example"))                                                                  
}   
    
func main() {
    goth.UseProviders(
        twitter.New("bu7D17UKHEjK7UTfNReTcG4gK", "K4uJb0lcUsBikNN9L4M53vMCET7vLogA2TnTf1j2y5VmxsTlUp", "http://162.243.216.116:3000/auth/twitter/callback"),
    )
    
    m := make(map[string]string)
    m["twitter"] = "Twitter"
    
    var keys []string
    for k := range m {
        keys = append(keys, k)
    }
    sort.Strings(keys)
    
    providerIndex := &ProviderIndex{Providers: keys, ProvidersMap: m}
    
    p := pat.New()
    p.Get("/auth/{provider}/callback", func(res http.ResponseWriter, req *http.Request) {   
    user, err := gothic.CompleteUserAuth(res, req)
        if err != nil {
            fmt.Fprintln(res, err)
            return
        }   
        t, _ := template.New("foo").Parse(userTemplate)
        t.Execute(res, user)
    })  
    
    p.Get("/auth/{provider}", gothic.BeginAuthHandler)
    p.Get("/", func(res http.ResponseWriter, req *http.Request) {
        t, _ := template.New("foo").Parse(indexTemplate)
        t.Execute(res, providerIndex)
    })  
    http.ListenAndServe(":3000", p)
}   
    
type ProviderIndex struct {
    Providers    []string                                                                                                                             
    ProvidersMap map[string]string
}   
    
var indexTemplate = `{{range $key,$value:=.Providers}}
    <p><a href="/auth/{{$value}}">Log in with {{index $.ProvidersMap $value}}</a></p>
{{end}}`
    
var userTemplate = `
<p>Name: {{.Name}}</p>
<p>Email: {{.Email}}</p>
<p>NickName: {{.NickName}}</p>
<p>Location: {{.Location}}</p>
<p>AvatarURL: {{.AvatarURL}} <img src="{{.AvatarURL}}"></p>
<p>Description: {{.Description}}</p>
<p>UserID: {{.UserID}}</p>
<p>AccessToken: {{.AccessToken}}</p>
<p>ExpiresAt: {{.ExpiresAt}}</p>
<p>RefreshToken: {{.RefreshToken}}</p>`