twitter golang oauth2

twitter_oauth2.go

// Package twitter allows to do twitter oauth2 calls with the standard oauth2 package
// I created this public gist after hours spent trying to find something that works.
// This is copy paste from production code, with all database and framework specifics removed by hand,
// so I don't know if it works "as is".
package twitter



var (
	TWITTER_CONFIG = &oauth2.Config{
		ClientID:     ClientID,
		ClientSecret: ClientSecret,
		Endpoint: oauth2.Endpoint{
			//			AuthURL:   "https://twitter.com/i/oauth2/authorize",
			AuthURL:   "https://twitter.com/i/oauth2/authorize",
			TokenURL:  "https://api.twitter.com/2/oauth2/token",
			AuthStyle: oauth2.AuthStyleInHeader,
		},
		Scopes: []string{"tweet.read", "tweet.write", "users.read", "offline.access"},
	}
)


func twitter_redirect_url(host string) string {
	return "https://" + host + "/networks/twitter/create" // That's just me
}


func genRedirectURL(w http.ResponseWriter, r *http.Request) {
  state:= "Whatever you want back from twitter" // I use a base64 hmac to ensure the users does not modify it
  	url := TWITTER_CONFIG.AuthCodeURL(state,
		oauth2.SetAuthURLParam("redirect_uri", twitter_redirect_url(r.Host)),
		oauth2.SetAuthURLParam("code_challenge", "SOME_CODE_CHALLANGE"),
		oauth2.SetAuthURLParam("code_challenge_method", "plain"),
	)
}

func createToken(w http.ResposneWritter, r *http.Request) {
  
  tok, err := TWITTER_CONFIG.Exchange(ctx, r.FormValue("code"),
		oauth2.SetAuthURLParam("redirect_uri", twitter_redirect_url(r.Host)),
		oauth2.SetAuthURLParam("code_verifier", "SOME_CODE_CHALLANGE"),
	)
 
  ...
  
}

  
}