初始提交: Gitea 项目代码

2026-05-30 22:47:36 +08:00
commit f288f76350
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+// Copyright 2020 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package context
+
+import (
+	"fmt"
+	"image/color"
+	"sync"
+
+	"gitea.dev/modules/cache"
+	"gitea.dev/modules/hcaptcha"
+	"gitea.dev/modules/log"
+	"gitea.dev/modules/mcaptcha"
+	"gitea.dev/modules/recaptcha"
+	"gitea.dev/modules/setting"
+	"gitea.dev/modules/templates"
+	"gitea.dev/modules/turnstile"
+
+	"gitea.com/go-chi/captcha"
+)
+
+var (
+	imageCaptchaOnce sync.Once
+	cpt              *captcha.Captcha
+)
+
+// GetImageCaptcha returns global image captcha
+func GetImageCaptcha() *captcha.Captcha {
+	imageCaptchaOnce.Do(func() {
+		cpt = captcha.NewCaptcha(captcha.Options{
+			SubURL: setting.AppSubURL,
+			// Use a color palette with high contrast colors suitable for both light and dark modes
+			// These colors provide good visibility and readability in both themes
+			ColorPalette: color.Palette{
+				color.RGBA{R: 234, G: 67, B: 53, A: 255},  // Bright red
+				color.RGBA{R: 66, G: 133, B: 244, A: 255}, // Medium blue
+				color.RGBA{R: 52, G: 168, B: 83, A: 255},  // Green
+				color.RGBA{R: 251, G: 188, B: 5, A: 255},  // Yellow/gold
+				color.RGBA{R: 171, G: 71, B: 188, A: 255}, // Purple
+			},
+		})
+		cpt.Store = cache.GetCache().ChiCache()
+	})
+	return cpt
+}
+
+const (
+	gRecaptchaResponseField  = "g-recaptcha-response"
+	hCaptchaResponseField    = "h-captcha-response"
+	mCaptchaResponseField    = "mcaptcha__token" // this form key is hard-coded in the mcaptcha frontend library
+	cfTurnstileResponseField = "cf-turnstile-response"
+)
+
+// VerifyCaptcha verifies Captcha data
+// No-op if captchas are not enabled
+func VerifyCaptcha(ctx *Context, tpl templates.TplName, form any) {
+	if !setting.Service.EnableCaptcha {
+		return
+	}
+
+	var valid bool
+	var err error
+	switch setting.Service.CaptchaType {
+	case setting.ImageCaptcha:
+		valid = GetImageCaptcha().VerifyReq(ctx.Req)
+	case setting.ReCaptcha:
+		valid, err = recaptcha.Verify(ctx, ctx.Req.Form.Get(gRecaptchaResponseField))
+	case setting.HCaptcha:
+		valid, err = hcaptcha.Verify(ctx, ctx.Req.Form.Get(hCaptchaResponseField))
+	case setting.MCaptcha:
+		valid, err = mcaptcha.Verify(ctx, ctx.Req.Form.Get(mCaptchaResponseField))
+	case setting.CfTurnstile:
+		valid, err = turnstile.Verify(ctx, ctx.Req.Form.Get(cfTurnstileResponseField))
+	default:
+		ctx.ServerError("Unknown Captcha Type", fmt.Errorf("unknown Captcha Type: %s", setting.Service.CaptchaType))
+		return
+	}
+	if err != nil {
+		log.Debug("Captcha Verify failed: %v", err)
+	}
+
+	if !valid {
+		ctx.Data["Err_Captcha"] = true
+		ctx.RenderWithErrDeprecated(ctx.Tr("form.captcha_incorrect"), tpl, form)
+	}
+}