add recaptcha util file

Author: y21

utils/recaptcha.go

@@ -0,0 +1,49 @@
+package utils
+
+import (
+"encoding/json"
+"errors"
+"github.com/blobs-io/blobsgame/utils/config"
+"io/ioutil"
+"net/http"
+)
+
+const (
+RecaptchaEndpoint = "https://www.google.com/recaptcha/api/siteverify"
+)
+
+type RecaptchaResponseBody struct {
+Success bool `json:"success"`
+ChallengeTimestamp string `json:"challenge_ts"`
+Hostname string `json:"hostname"`
+Score float32 `json:"score"`
+Action string `json:"action"`
+}
+
+func RateCaptcha(token string) (RecaptchaResponseBody, error) {
+req, err := http.Get(RecaptchaEndpoint + "?secret=" + config.MainConfig.Tokens.Recaptcha + "&response=" + token)
+if err != nil {
+return RecaptchaResponseBody{}, err
+}
+defer req.Body.Close()
+if req.StatusCode >= 400 {
+return RecaptchaResponseBody{}, errors.New("an unknown error occurred")
+}
+
+resp, err := ioutil.ReadAll(req.Body)
+if err != nil {
+return RecaptchaResponseBody{}, err
+}
+
+var respBody RecaptchaResponseBody
+err = json.Unmarshal(resp, &respBody)
+if err != nil {
+return RecaptchaResponseBody{}, err
+}
+
+return respBody, nil
+}
+
+func ValidateCaptcha(response RecaptchaResponseBody) bool {
+return response.Success && response.Score >= .6
+}