Created
January 13, 2020 09:17
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oauth2 facebook login
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| package main | |
| // from: https://stackoverflow.com/questions/27368973/golang-facebook-authentication-using-golang-org-x-oauth2 | |
| 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)) | |
| } |
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