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Facebook Login for Web with Using Go Server.Validate token from web client POST request. FB API called with GET request. Reponse to client in JSON
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| <!doctype html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1"> | |
| <title>Facebook Login Example</title> | |
| <meta name="description" content="Facebook Login Example"> | |
| <meta name="author" content="Matt Lockyer"> | |
| </head> | |
| <body> | |
| <div class="fb-login-button" data-width="" data-size="large" data-button-type="continue_with" data-auto-logout-link="false" data-use-continue-as="false"></div> | |
| <div id="fb-root"></div> | |
| <script crossorigin="anonymous" src="https://connect.facebook.net/en_US/sdk.js#xfbml=1&version=v3.3&appId=xxxxxxxxxxxxxxx&autoLogAppEvents=1"></script> | |
| <script> | |
| window.onload = () => { | |
| FB.getLoginStatus(async (response) => { | |
| if (response.status === 'connected') { | |
| const token = response.authResponse.accessToken | |
| console.log(token) | |
| const res = await fetch('http://localhost:8080/validate', { | |
| method: 'POST', mode: "cors", | |
| body: JSON.stringify({ token }) | |
| }).then((res) => json()) | |
| console.log(res) | |
| } | |
| }) | |
| } | |
| </script> | |
| </body> | |
| </html> |
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| package main | |
| import ( | |
| "encoding/json" | |
| "net/http" | |
| ) | |
| /******************************** | |
| Accept TokenPayload from the client with only token field provided | |
| Validate client token with fb api | |
| Repond with TokenPayload fully or partially filled | |
| ********************************/ | |
| var access_token string = "xxxxxxxxxxxxxxx|xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" | |
| type TokenPayload struct { | |
| UserId string `json:"user_id"` | |
| Token string `json:"token"` | |
| Message string `json:"message"` | |
| } | |
| type msi = map[string]interface{} | |
| func validate(w http.ResponseWriter, r *http.Request) { | |
| // Read body | |
| defer r.Body.Close() | |
| // Unmarshal | |
| var payload TokenPayload | |
| err := json.NewDecoder(r.Body).Decode(&payload) | |
| if err != nil { | |
| http.Error(w, err.Error(), 500) | |
| return | |
| } | |
| // Fetch response for payload.Token | |
| r2, err := http.Get("https://graph.facebook.com/v3.3/debug_token?input_token=" + | |
| payload.Token + "&access_token=" + access_token) | |
| if err != nil { | |
| http.Error(w, err.Error(), 500) | |
| return | |
| } | |
| defer r2.Body.Close() | |
| var r3 msi | |
| err = json.NewDecoder(r2.Body).Decode(&r3) | |
| if err != nil { | |
| http.Error(w, err.Error(), 500) | |
| return | |
| } | |
| // FB error will respond with object { "error": ... } and the below will panic | |
| if r3["error"] != nil { | |
| http.Error(w, err.Error(), 500) | |
| return | |
| } | |
| fbData := r3["data"].(msi) | |
| if (!fbData["is_valid"].(bool)) { | |
| payload.Message = "FB token not valid" | |
| } else { | |
| payload.Message = "FB token is valid" | |
| payload.UserId = fbData["user_id"].(string) | |
| } | |
| // Return output | |
| output, err := json.Marshal(payload) | |
| if err != nil { | |
| http.Error(w, err.Error(), 500) | |
| return | |
| } | |
| w.Header().Set("content-type", "application/json") | |
| w.Write(output) | |
| } | |
| func main() { | |
| http.Handle("/", http.FileServer(http.Dir("./static"))) | |
| http.HandleFunc("/validate", validate) | |
| http.ListenAndServe(":8080", nil) | |
| println("Listening on 8080") | |
| } | |
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