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Foursquare GoLang Example
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package main | |
import ( | |
"fmt" | |
"net/http" | |
"io/ioutil" | |
"golang.org/x/oauth2" | |
"golang.org/x/oauth2/foursquare" | |
) | |
var ( | |
foursquareOauthConfig = &oauth2.Config{ | |
RedirectURL: "http://localhost:4000/FoursquareCallback", | |
ClientID: os.Getenv("foursquarekey"), | |
ClientSecret: os.Getenv("foursquaresecret"), | |
Endpoint: foursquare.Endpoint, | |
} | |
// Some random string, random for each request | |
oauthStateString = "random" | |
) | |
const htmlIndex = `<html><body> | |
<a href="/FoursquareLogin">Log in with Foursquare</a> | |
</body></html> | |
` | |
func main() { | |
http.HandleFunc("/", handleMain) | |
http.HandleFunc("/FoursquareLogin", handleFoursquareLogin) | |
http.HandleFunc("/FoursquareCallback", handleFoursquareCallback) | |
fmt.Println(http.ListenAndServe(":4000", nil)) | |
} | |
func handleMain(w http.ResponseWriter, r *http.Request) { | |
fmt.Fprintf(w, htmlIndex) | |
} | |
func handleFoursquareLogin(w http.ResponseWriter, r *http.Request) { | |
url := foursquareOauthConfig.AuthCodeURL(oauthStateString) | |
http.Redirect(w, r, url, http.StatusTemporaryRedirect) | |
} | |
func handleFoursquareCallback(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 := foursquareOauthConfig.Exchange(oauth2.NoContext, code) | |
if err != nil { | |
fmt.Printf("oauthConf.Exchange() failed with '%s'\n", err) | |
http.Redirect(w, r, "/", http.StatusTemporaryRedirect) | |
return | |
} | |
response, err := http.Get("https://api.foursquare.com/v2/users/self/checkins?v=20160815&afterTimestamp=1279044824&oauth_token=" + token.AccessToken) | |
defer response.Body.Close() | |
contents, err := ioutil.ReadAll(response.Body) | |
fmt.Fprintf(w, "Content: %s\n", contents) | |
} |
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