1 files changed, 47 insertions, 0 deletions
diff --git a/modules/recaptcha/recaptcha.go b/modules/recaptcha/recaptcha.go
new file mode 100644
index 0000000000..1009185961
--- /dev/null
+++ b/modules/recaptcha/recaptcha.go
@@ -0,0 +1,47 @@
+// Copyright 2018 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package recaptcha
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"net/url"
+	"time"
+
+	"code.gitea.io/gitea/modules/setting"
+)
+
+// Response is the structure of JSON returned from API
+type Response struct {
+	Success     bool      `json:"success"`
+	ChallengeTS time.Time `json:"challenge_ts"`
+	Hostname    string    `json:"hostname"`
+	ErrorCodes  []string  `json:"error-codes"`
+}
+
+const apiURL = "https://www.google.com/recaptcha/api/siteverify"
+
+// Verify calls Google Recaptcha API to verify token
+func Verify(response string) (bool, error) {
+	resp, err := http.PostForm(apiURL,
+		url.Values{"secret": {setting.Service.RecaptchaSecret}, "response": {response}})
+	if err != nil {
+		return false, fmt.Errorf("Failed to send CAPTCHA response: %s", err)
+	}
+	defer resp.Body.Close()
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return false, fmt.Errorf("Failed to read CAPTCHA response: %s", err)
+	}
+	var jsonResponse Response
+	err = json.Unmarshal(body, &jsonResponse)
+	if err != nil {
+		return false, fmt.Errorf("Failed to parse CAPTCHA response: %s", err)
+	}
+
+	return jsonResponse.Success, nil
+}