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oauth_google_callback.go
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oauth_google_callback.go
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package main
import (
"encoding/json"
"fmt"
"golang.org/x/oauth2"
"io/ioutil"
"net/http"
)
func googleCallbackHandler(w http.ResponseWriter, r *http.Request) {
commenterToken := r.FormValue("state")
code := r.FormValue("code")
_, err := commenterGetByCommenterToken(commenterToken)
if err != nil && err != errorNoSuchToken {
fmt.Fprintf(w, "Error: %s\n", err.Error())
return
}
token, err := googleConfig.Exchange(oauth2.NoContext, code)
if err != nil {
fmt.Fprintf(w, "Error: %s", err.Error())
return
}
resp, err := http.Get("https://www.googleapis.com/oauth2/v2/userinfo?access_token=" + token.AccessToken)
defer resp.Body.Close()
contents, err := ioutil.ReadAll(resp.Body)
if err != nil {
fmt.Fprintf(w, "Error: %s", errorCannotReadResponse.Error())
return
}
user := make(map[string]interface{})
if err := json.Unmarshal(contents, &user); err != nil {
fmt.Fprintf(w, "Error: %s", errorInternal.Error())
return
}
if user["email"] == nil {
fmt.Fprintf(w, "Error: no email address returned by Github")
return
}
email := user["email"].(string)
c, err := commenterGetByEmail("google", email)
if err != nil && err != errorNoSuchCommenter {
fmt.Fprintf(w, "Error: %s", err.Error())
return
}
name := user["name"].(string)
link := "undefined"
if user["link"] != nil {
link = user["link"].(string)
}
photo := "undefined"
if user["picture"] != nil {
photo = user["picture"].(string)
}
var commenterHex string
if err == errorNoSuchCommenter {
commenterHex, err = commenterNew(email, name, link, photo, "google", "")
if err != nil {
fmt.Fprintf(w, "Error: %s", err.Error())
return
}
} else {
if err = commenterUpdate(c.CommenterHex, email, name, link, photo, "google"); err != nil {
logger.Warningf("cannot update commenter: %s", err)
// not a serious enough to exit with an error
}
commenterHex = c.CommenterHex
}
if err := commenterSessionUpdate(commenterToken, commenterHex); err != nil {
fmt.Fprintf(w, "Error: %s", err.Error())
return
}
fmt.Fprintf(w, "<html><script>window.parent.close()</script></html>")
}