// example/example.go
package main

import (
    "fmt"
    "net/http"
    "os"

    "golang.org/x/net/context"

    "goji.io"
    "goji.io/pat"

    "golang.org/x/oauth2"
    "golang.org/x/oauth2/facebook"
    "golang.org/x/oauth2/google"

    "github.com/knq/oauthmw"
    "github.com/knq/sessionmw"
)

func main() {
    // create session
    sess := &sessionmw.Config{
        Name:        "mySessionCookie",
        Secret:      []byte("K7qv0EG3tBvDXCXhPcrRmdceS0RCMm8B"),
        BlockSecret: []byte("xUYUQ4seHVFFhJ2iInWpnfPHrYomVeaf"),
        Store:       sessionmw.NewMemStore(),
    }

    // create oauthmw provider
    prov := oauthmw.Provider{
        Secret:      []byte("NzfWi6Sj3gQ8cEUmu3f705bGLyGJ6Xh3"),
        BlockSecret: []byte("LxUpc1GPFKFQ5tMpciQAgv5o80yuzBzH"),
        Path:        "/",
        Configs: map[string]*oauth2.Config{
            "google": {
                Endpoint:     google.Endpoint,
                ClientID:     os.Getenv("OAUTHMW_GOOGLEID"),
                ClientSecret: os.Getenv("OAUTHMW_GOOGLESECRET"),
                RedirectURL:  "http://localhost:8000/oauth-login",
                Scopes: []string{
                    "https://www.googleapis.com/auth/plus.login",
                    "https://www.googleapis.com/auth/userinfo.email",
                },
            },
            "facebook": {
                Endpoint:     facebook.Endpoint,
                ClientID:     os.Getenv("OAUTHMW_FACEBOOKID"),
                ClientSecret: os.Getenv("OAUTHMW_FACEBOOKSECRET"),
                RedirectURL:  "http://localhost:8000/oauth-login",
                Scopes: []string{
                    "public_profile,email",
                },
            },
        },
    }

    mux := goji.NewMux()

    // add middleware
    mux.UseC(sess.Handler)
    mux.UseC(prov.RequireLogin(func(provName string, config *oauth2.Config, token *oauth2.Token) (string, bool) {
        // this is a super fancy check callback function
        switch provName {
        case "facebook":
            // client := config.Client(context, token)
        case "google":
            // client := config.Client(context, token)

        default:
            return "bad provider!", false
        }

        // no errors encountered
        return "", true
    }))

    // simple demonstration handler
    mux.HandleFuncC(pat.Get("/*"), func(ctxt context.Context, res http.ResponseWriter, req *http.Request) {
        http.Error(res, fmt.Sprintf("this is my protected area! path: %+v", ctxt), http.StatusOK)
    })

    // serve
    http.ListenAndServe(":8000", mux)
}