/
long_lived_token.go
96 lines (78 loc) · 2.44 KB
/
long_lived_token.go
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package fbvideo
import (
"encoding/json"
"errors"
"net/http"
"net/url"
)
type LongLivedTokenGenerater struct {
longLivedToken string
ClientID string
ClientSecret string
RedirectURL string
}
func NewLongLivedTokenGenerater(clientID, clientSecret, redirectURL string) *LongLivedTokenGenerater {
return &LongLivedTokenGenerater{
ClientID: clientID,
ClientSecret: clientSecret,
RedirectURL: redirectURL,
}
}
// GenerateLongLivedToken generate a long-lived token from the short token.
func (g *LongLivedTokenGenerater) GenerateLongLivedToken(shortToken string) (string, error) {
form := url.Values{}
form.Add("grant_type", "fb_exchange_token")
form.Add("client_id", g.ClientID)
form.Add("client_secret", g.ClientSecret)
form.Add("fb_exchange_token", shortToken)
endpointURL := "https://graph.facebook.com/oauth/access_token?" + form.Encode()
resp, err := http.Get(endpointURL)
if err != nil {
return "", nil
}
if resp.StatusCode != 200 {
return "", errors.New(resp.Status)
}
return NewLongLivedTokenFromBody(resp.Body).AccessToken, nil
}
//RefreshLongLivedToken get a new long-lived token from an old long-lived token.
func (g *LongLivedTokenGenerater) RefreshLongLivedToken(longLivedToken string) (string, error) {
code, err := g.getClientCode(longLivedToken)
if err != nil {
return "", err
}
return g.redeemClientCode(code)
}
func (g *LongLivedTokenGenerater) getClientCode(longLivedToken string) (string, error) {
form := url.Values{}
form.Add("access_token", longLivedToken)
form.Add("client_id", g.ClientID)
form.Add("client_secret", g.ClientSecret)
form.Add("redirect_uri", g.RedirectURL)
endpointURL := "https://graph.facebook.com/oauth/client_code?" + form.Encode()
resp, err := http.Get(endpointURL)
if err != nil {
return "", nil
}
if resp.StatusCode != 200 {
return "", errors.New(resp.Status)
}
var jsonObject map[string]string
json.NewDecoder(resp.Body).Decode(&jsonObject)
return jsonObject["code"], nil
}
func (g *LongLivedTokenGenerater) redeemClientCode(code string) (string, error) {
form := url.Values{}
form.Add("code", code)
form.Add("client_id", g.ClientID)
form.Add("redirect_uri", g.RedirectURL)
endpointURL := "https://graph.facebook.com/oauth/access_token?" + form.Encode()
resp, err := http.Get(endpointURL)
if err != nil {
return "", nil
}
if resp.StatusCode != 200 {
return "", errors.New(resp.Status)
}
return NewLongLivedTokenFromBody(resp.Body).AccessToken, nil
}