1 files changed, 69 insertions, 0 deletions
diff --git a/api/hcaptcha.go b/api/hcaptcha.go
new file mode 100644
index 0000000..a310c01
--- /dev/null
+++ b/api/hcaptcha.go
@@ -0,0 +1,69 @@
+package api
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"strings"
+)
+
+func verifyCaptcha(secret, response string) error {
+	verifyURL := "https://hcaptcha.com/siteverify"
+	body := strings.NewReader("secret=" + secret + "&response=" + response)
+
+	req, err := http.NewRequest("POST", verifyURL, body)
+	if err != nil {
+		return err
+	}
+
+	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+
+	client := &http.Client{}
+	resp, err := client.Do(req)
+	if err != nil {
+		return err
+	}
+
+	jsonResponse := struct {
+		Success bool `json:"success"`
+	}{}
+	err = json.NewDecoder(resp.Body).Decode(&jsonResponse)
+	if err != nil {
+		return err
+	}
+
+	if !jsonResponse.Success {
+		return fmt.Errorf("hcaptcha verification failed")
+	}
+
+	defer resp.Body.Close()
+	return nil
+}
+
+func CaptchaArgsContinuation(context *RequestContext, req *http.Request, resp http.ResponseWriter) ContinuationChain {
+	return func(success Continuation, failure Continuation) ContinuationChain {
+		(*context.TemplateData)["HcaptchaArgs"] = HcaptchaArgs{
+			SiteKey: context.Args.HcaptchaSiteKey,
+		}
+		return success(context, req, resp)
+	}
+}
+
+func CaptchaVerificationContinuation(context *RequestContext, req *http.Request, resp http.ResponseWriter) ContinuationChain {
+	return func(success Continuation, failure Continuation) ContinuationChain {
+		hCaptchaResponse := req.FormValue("h-captcha-response")
+		secretKey := context.Args.HcaptchaSecret
+
+		err := verifyCaptcha(secretKey, hCaptchaResponse)
+		if err != nil {
+			(*context.TemplateData)["FormError"] = FormError{
+				Errors: []string{"hCaptcha verification failed"},
+			}
+			resp.WriteHeader(http.StatusBadRequest)
+
+			return failure(context, req, resp)
+		}
+
+		return success(context, req, resp)
+	}
+}