How to use the "dchest/captcha" in fiber?

[jzyzxx]

I am a green hand about the fiber framework,is there any demos?Thanks alot.

[jzyzxx]

The "dchest/captcha" is a good captcha framework,but i do not know haw to use it in fiber

[ReneWerner87]

boilderplate: https://github.com/gofiber/boilerplate/

recipes: https://github.com/gofiber/recipes

some third party repositories: https://github.com/gofiber/fiber#-third-party-middlewares -> boilerplate https://github.com/thomasvvugt/fiber-boilerplate https://github.com/sujit-baniya/fiber-boilerplate

documentation: https://docs.gofiber.io/

articles: https://gofiber.io/ -> go to media section

other external middlewares: https://github.com/gofiber/contrib#-middleware-implementations

[ReneWerner87]

if you need help with the captcha repository, i can't help you because i don't have any experience with it.

if the solution can only work with the native http packet, i would say you should use the adapter packet from us https://github.com/gofiber/adaptor

[jzyzxx]

if you need help with the captcha repository, i can't help you because i don't have any experience with it.

if the solution can only work with the native http packet, i would say you should use the adapter packet from us https://github.com/gofiber/adaptor

Thank you,i would have a try

[jzyzxx]

There are my captcha package,it works.

package captcha

import (
    "bytes"
    "fmt"
    "path"
    "strings"
    "github.com/gofiber/fiber/v2"
    "github.com/dchest/captcha"
)

type CaptchaResponse struct {
    CaptchaId string `json:"captchaId"` //验证码Id
    ImageUrl  string `json:"imageUrl"`  //验证码图片url
}

func Captcha(c *fiber.Ctx) error{
    length := captcha.DefaultLen
    captchaId := captcha.NewLen(length)
    var captcha CaptchaResponse
    captcha.CaptchaId = captchaId
    captcha.ImageUrl = "/captcha/" + captchaId + ".png"
    return c.JSON(captcha)
}
func CaptchaImage(c *fiber.Ctx) error {
    captchaId := c.Params("captchaId")
        fmt.Println("GetCaptchaPng : " + captchaId)
        return ServeHTTP(c)
}
func Verify(c *fiber.Ctx) {
    captchaId := c.FormValue("captchaId")
    value := c.FormValue("value")
    if captchaId == "" || value == "" {
        c.SendString("参数错误")
    }
    if captcha.VerifyString(captchaId, value) {
        c.SendString("验证成功")
    } else {
        c.SendString("验证失败")
    }
}
func ServeHTTP(c *fiber.Ctx) error {
    dir, file := path.Split(c.Path())
    ext := path.Ext(file)
    id := file[:len(file)-len(ext)]
    fmt.Println("file : " + file)
    fmt.Println("ext : " + ext)
    fmt.Println("id : " + id)
    if ext == "" || id == "" {
        // http.NotFound(w, r)
        return c.SendString("404 Not Found")
    }
    fmt.Println("reload : " + c.FormValue("reload"))
    if c.FormValue("reload") != "" {
        captcha.Reload(id)
    }
    lang := strings.ToLower(c.FormValue("lang"))
    download := path.Base(dir) == "download"
    if Serve(c, id, ext, lang, download, captcha.StdWidth, captcha.StdHeight) == captcha.ErrNotFound {
        // http.NotFound(w, r)
        return c.SendString("404 Not Found")
    }
    return Serve(c, id, ext, lang, download, captcha.StdWidth, captcha.StdHeight)
}
func Serve(c *fiber.Ctx, id, ext, lang string, download bool, width, height int) error {
    c.Set("Cache-Control", "no-cache, no-store, must-revalidate")
    c.Set("Pragma", "no-cache")
    c.Set("Expires", "0")

    var content bytes.Buffer
    switch ext {
    case ".png":
        c.Set("Content-Type", "image/png")
        captcha.WriteImage(&content, id, width, height)
    case ".wav":
        c.Set("Content-Type", "audio/x-wav")
        captcha.WriteAudio(&content, id, lang)
    default:
        return captcha.ErrNotFound
    }

    if download {
        c.Set("Content-Type", "application/octet-stream")
    }
     c.Write(content.Bytes())
    // http.ServeContent(w, r, id+ext, time.Time{}, bytes.NewReader(content.Bytes()))
    return nil
}