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fb.go
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fb.go
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package main
import (
"fmt"
"golang.org/x/oauth2"
"github.com/antonholmquist/jason"
//"github.com/golang/oauth2"
"net/http"
"strconv"
"strings"
)
type AccessToken struct {
Token string
Expiry int64
}
func readHttpBody(response *http.Response) string {
fmt.Println("Reading body")
bodyBuffer := make([]byte, 5000)
var str string
count, err := response.Body.Read(bodyBuffer)
for ; count > 0; count, err = response.Body.Read(bodyBuffer) {
if err != nil {
}
str += string(bodyBuffer[:count])
}
return str
}
//Converts a code to an Auth_Token
func GetAccessToken(client_id string, code string, secret string, callbackUri string) AccessToken {
fmt.Println("GetAccessToken")
//https://graph.facebook.com/oauth/access_token?client_id=YOUR_APP_ID&redirect_uri=YOUR_REDIRECT_URI&client_secret=YOUR_APP_SECRET&code=CODE_GENERATED_BY_FACEBOOK
response, err := http.Get("https://graph.facebook.com/oauth/access_token?client_id=" +
client_id + "&redirect_uri=" + callbackUri +
"&client_secret=" + secret + "&code=" + code)
if err == nil {
auth := readHttpBody(response)
var token AccessToken
tokenArr := strings.Split(auth, "&")
token.Token = strings.Split(tokenArr[0], "=")[1]
expireInt, err := strconv.Atoi(strings.Split(tokenArr[1], "=")[1])
if err == nil {
token.Expiry = int64(expireInt)
}
return token
}
var token AccessToken
return token
}
func fbHome(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/html; charset=utf-8")
// generate loginURL
fbConfig := &oauth2.Config{
// ClientId: FBAppID(string), ClientSecret : FBSecret(string)
// Example - ClientId: "1234567890", ClientSecret: "red2drdff6e2321e51aedcc94e19c76ee"
ClientID: "759729064806025", // change this to yours
ClientSecret: "",
RedirectURL: "https://votezilla.news",
Scopes: []string{"email", "user_birthday", "user_location", "user_about_me"},
Endpoint: oauth2.Endpoint{
AuthURL: "https://www.facebook.com/dialog/oauth",
TokenURL: "https://graph.facebook.com/oauth/access_token",
},
}
url := fbConfig.AuthCodeURL("")
// Home page will display a button for login to Facebook
w.Write([]byte("<html><title>Golang Login Facebook Example</title> <body> <a href='" + url + "'><button>Login with Facebook!</button> </a> </body></html>"))
}
func fbLogin(w http.ResponseWriter, r *http.Request) {
// grab the code fragment
w.Header().Set("Content-Type", "text/html; charset=utf-8")
code := r.FormValue("code")
ClientId := "" // change this to yours
ClientSecret := ""
RedirectURL := "http://<domain name and don't forget port number if you use one>/FBLogin"
accessToken := GetAccessToken(ClientId, code, ClientSecret, RedirectURL)
response, err := http.Get("https://graph.facebook.com/me?access_token=" + accessToken.Token)
// handle err. You need to change this into something more robust
// such as redirect back to home page with error message
if err != nil {
w.Write([]byte(err.Error()))
}
str := readHttpBody(response)
prVal("str", str)
// dump out all the data
// w.Write([]byte(str))
// see https://www.socketloop.com/tutorials/golang-process-json-data-with-jason-package
user, _ := jason.NewObjectFromBytes([]byte(str))
prVal("user", user)
id, _ := user.GetString("id")
email, _ := user.GetString("email")
bday, _ := user.GetString("birthday")
fbusername, _ := user.GetString("username")
w.Write([]byte(fmt.Sprintf("Username %s ID is %s and birthday is %s and email is %s<br>", fbusername, id, bday, email)))
img := "https://graph.facebook.com/" + id + "/picture?width=180&height=180"
w.Write([]byte("Photo is located at " + img + "<br>"))
// see https://www.socketloop.com/tutorials/golang-download-file-example on how to save FB file to disk
w.Write([]byte("<img src='" + img + "'>"))
}