这是一个帮助您入门的简单示例：
package main
import (
"fmt"
"io/ioutil"
"log"
"net/http"
"net/url"
"strings"
"golang.org/x/oauth2"
"golang.org/x/oauth2/facebook"
)
var (
oauthConf = &oauth2.Config{
ClientID: "YOUR_CLIENT_ID",
ClientSecret: "YOUR_CLIENT_SECRET",
RedirectURL: "YOUR_REDIRECT_URL_CALLBACK",
Scopes: []string{"public_profile"},
Endpoint: facebook.Endpoint,
}
oauthStateString = "thisshouldberandom"
)
const htmlIndex = `<html><body>
Logged in with <a href="/login">facebook</a>
</body></html>
`
func handleMain(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/html; charset=utf-8")
w.WriteHeader(http.StatusOK)
w.Write([]byte(htmlIndex))
}
func handleFacebookLogin(w http.ResponseWriter, r *http.Request) {
Url, err := url.Parse(oauthConf.Endpoint.AuthURL)
if err != nil {
log.Fatal("Parse: ", err)
}
parameters := url.Values{}
parameters.Add("client_id", oauthConf.ClientID)
parameters.Add("scope", strings.Join(oauthConf.Scopes, " "))
parameters.Add("redirect_uri", oauthConf.RedirectURL)
parameters.Add("response_type", "code")
parameters.Add("state", oauthStateString)
Url.RawQuery = parameters.Encode()
url := Url.String()
http.Redirect(w, r, url, http.StatusTemporaryRedirect)
}
func handleFacebookCallback(w http.ResponseWriter, r *http.Request) {
state := r.FormValue("state")
if state != oauthStateString {
fmt.Printf("invalid oauth state, expected '%s', got '%s'\n", oauthStateString, state)
http.Redirect(w, r, "/", http.StatusTemporaryRedirect)
return
}
code := r.FormValue("code")
token, err := oauthConf.Exchange(oauth2.NoContext, code)
if err != nil {
fmt.Printf("oauthConf.Exchange() failed with '%s'\n", err)
http.Redirect(w, r, "/", http.StatusTemporaryRedirect)
return
}
resp, err := http.Get("https://graph.facebook.com/me?access_token=" +
url.QueryEscape(token.AccessToken))
if err != nil {
fmt.Printf("Get: %s\n", err)
http.Redirect(w, r, "/", http.StatusTemporaryRedirect)
return
}
defer resp.Body.Close()
response, err := ioutil.ReadAll(resp.Body)
if err != nil {
fmt.Printf("ReadAll: %s\n", err)
http.Redirect(w, r, "/", http.StatusTemporaryRedirect)
return
}
log.Printf("parseResponseBody: %s\n", string(response))
http.Redirect(w, r, "/", http.StatusTemporaryRedirect)
}
func main() {
http.HandleFunc("/", handleMain)
http.HandleFunc("/login", handleFacebookLogin)
http.HandleFunc("/oauth2callback", handleFacebookCallback)
fmt.Print("Started running on http://localhost:9090\n")
log.Fatal(http.ListenAndServe(":9090", nil))
}
