2018-05-27 22:40:42 +08:00
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package main
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import (
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"encoding/json"
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"fmt"
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"golang.org/x/oauth2"
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"io/ioutil"
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"net/http"
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)
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func googleCallbackHandler(w http.ResponseWriter, r *http.Request) {
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session := r.FormValue("state")
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code := r.FormValue("code")
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2018-06-07 15:43:02 +08:00
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_, err := commenterSessionGet(session)
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if err != nil && err != errorNoSuchSession {
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2018-05-27 22:40:42 +08:00
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fmt.Fprintf(w, "Error: %s\n", err.Error())
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return
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}
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token, err := googleConfig.Exchange(oauth2.NoContext, code)
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if err != nil {
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fmt.Fprintf(w, "Error: %s", err.Error())
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return
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}
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resp, err := http.Get("https://www.googleapis.com/oauth2/v2/userinfo?access_token=" + token.AccessToken)
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defer resp.Body.Close()
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contents, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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fmt.Fprintf(w, "Error: %s", errorCannotReadResponse.Error())
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return
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}
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user := make(map[string]interface{})
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if err := json.Unmarshal(contents, &user); err != nil {
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fmt.Fprintf(w, "Error: %s", errorInternal.Error())
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return
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}
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exists, err := commenterIsProviderUser("google", user["email"].(string))
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if err != nil {
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fmt.Fprintf(w, "Error: %s", err.Error())
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return
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}
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var commenterHex string
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// TODO: in case of returning users, update the information we have on record?
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2018-06-07 15:43:02 +08:00
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if err == errorNoSuchCommenter {
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2018-05-27 22:40:42 +08:00
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var email string
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if _, ok := user["email"]; ok {
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email = user["email"].(string)
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} else {
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2018-06-07 15:43:02 +08:00
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fmt.Fprintf(w, "Error: %s", errorInvalidEmail.Error())
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2018-05-27 22:40:42 +08:00
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return
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}
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var link string
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if val, ok := user["link"]; ok {
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link = val.(string)
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} else {
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link = "undefined"
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}
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commenterHex, err = commenterNew(email, user["name"].(string), link, user["picture"].(string), "google")
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if err != nil {
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fmt.Fprintf(w, "Error: %s", err.Error())
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return
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}
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}
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if err := commenterSessionUpdate(session, commenterHex); err != nil {
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fmt.Fprintf(w, "Error: %s", err.Error())
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return
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}
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fmt.Fprintf(w, "<html><script>window.parent.close()</script></html>")
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}
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