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add captcha util
This commit is contained in:
slene
parent
fee3c2b8f9
commit
f419c12427
@ -3,7 +3,6 @@ package beego
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import (
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"bytes"
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"crypto/hmac"
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"crypto/rand"
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"crypto/sha1"
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"encoding/base64"
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"errors"
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@ -22,6 +21,7 @@ import (
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"github.com/astaxie/beego/context"
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"github.com/astaxie/beego/session"
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"github.com/astaxie/beego/utils"
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)
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var (
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@ -455,7 +455,7 @@ func (c *Controller) XsrfToken() string {
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} else {
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expire = int64(XSRFExpire)
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}
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token = getRandomString(15)
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token = string(utils.RandomCreateBytes(15))
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c.SetSecureCookie(XSRFKEY, "_xsrf", token, expire)
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}
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c._xsrf_token = token
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@ -492,14 +492,3 @@ func (c *Controller) XsrfFormHtml() string {
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func (c *Controller) GetControllerAndAction() (controllerName, actionName string) {
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return c.controllerName, c.actionName
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}
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// getRandomString returns random string.
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func getRandomString(n int) string {
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const alphanum = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
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var bytes = make([]byte, n)
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rand.Read(bytes)
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for i, b := range bytes {
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bytes[i] = alphanum[b%byte(len(alphanum))]
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}
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return string(bytes)
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}
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184
utils/captcha/captcha.go
Normal file
184
utils/captcha/captcha.go
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@ -0,0 +1,184 @@
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package captcha
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// modifiy and integrated to Beego in one file from https://github.com/dchest/captcha
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import (
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"fmt"
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"html/template"
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"net/http"
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"path"
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"strings"
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"github.com/astaxie/beego"
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"github.com/astaxie/beego/cache"
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"github.com/astaxie/beego/context"
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"github.com/astaxie/beego/utils"
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)
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var (
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defaultChars = []byte{0, 1, 2, 3, 4, 5, 6, 7, 8, 9}
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)
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const (
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challengeNums = 6
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expiration = 600
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fieldIdName = "captcha_id"
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fieldCaptchaName = "captcha"
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cachePrefix = "captcha_"
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urlPrefix = "/captcha/"
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)
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type Captcha struct {
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store cache.Cache
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urlPrefix string
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FieldIdName string
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FieldCaptchaName string
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StdWidth int
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StdHeight int
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ChallengeNums int
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Expiration int64
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CachePrefix string
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}
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func (c *Captcha) key(id string) string {
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return c.CachePrefix + id
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}
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func (c *Captcha) genRandChars() []byte {
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return utils.RandomCreateBytes(c.ChallengeNums, defaultChars...)
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}
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func (c *Captcha) Handler(ctx *context.Context) {
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var chars []byte
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id := path.Base(ctx.Request.RequestURI)
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if i := strings.Index(id, "."); i != -1 {
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id = id[:i]
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}
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key := c.key(id)
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if v, ok := c.store.Get(key).([]byte); ok {
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chars = v
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} else {
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ctx.Output.SetStatus(404)
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ctx.WriteString("captcha not found")
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return
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}
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// reload captcha
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if len(ctx.Input.Query("reload")) > 0 {
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chars = c.genRandChars()
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if err := c.store.Put(key, chars, c.Expiration); err != nil {
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ctx.Output.SetStatus(500)
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ctx.WriteString("captcha reload error")
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beego.Error("Reload Create Captcha Error:", err)
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return
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}
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}
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img := NewImage(chars, c.StdWidth, c.StdHeight)
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if _, err := img.WriteTo(ctx.ResponseWriter); err != nil {
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beego.Error("Write Captcha Image Error:", err)
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}
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}
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func (c *Captcha) CreateCaptchaHtml() template.HTML {
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value, err := c.CreateCaptcha()
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if err != nil {
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beego.Error("Create Captcha Error:", err)
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return ""
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}
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// create html
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return template.HTML(fmt.Sprintf(`<input type="hidden" name="%s" value="%s">`+
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`<a class="captcha" href="javascript:">`+
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`<img onclick="this.src=('%s%s.png?reload='+(new Date()).getTime())" class="captcha-img" src="%s%s.png">`+
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`</a>`, c.FieldIdName, value, c.urlPrefix, value, c.urlPrefix, value))
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}
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func (c *Captcha) CreateCaptcha() (string, error) {
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// generate captcha id
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id := string(utils.RandomCreateBytes(15))
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// get the captcha chars
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chars := c.genRandChars()
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// save to store
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if err := c.store.Put(c.key(id), chars, c.Expiration); err != nil {
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return "", err
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}
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return id, nil
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}
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func (c *Captcha) VerifyReq(req *http.Request) bool {
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req.ParseForm()
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return c.Verify(req.Form.Get(c.FieldIdName), req.Form.Get(c.FieldCaptchaName))
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}
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func (c *Captcha) Verify(id string, challenge string) (success bool) {
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if len(challenge) == 0 || len(id) == 0 {
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return
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}
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var chars []byte
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key := c.key(id)
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if v, ok := c.store.Get(key).([]byte); ok && len(v) == len(challenge) {
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chars = v
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} else {
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return
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}
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defer func() {
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// finally remove it
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c.store.Delete(key)
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}()
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// verify challenge
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for i, c := range chars {
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if c != challenge[i]-48 {
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return
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}
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}
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return true
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}
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func NewCaptcha(urlPrefix string, store cache.Cache) *Captcha {
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cpt := &Captcha{}
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cpt.store = store
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cpt.FieldIdName = fieldIdName
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cpt.FieldCaptchaName = fieldCaptchaName
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cpt.ChallengeNums = challengeNums
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cpt.Expiration = expiration
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cpt.CachePrefix = cachePrefix
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cpt.StdWidth = stdWidth
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cpt.StdHeight = stdHeight
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if len(urlPrefix) == 0 {
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urlPrefix = urlPrefix
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}
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if urlPrefix[len(urlPrefix)-1] != '/' {
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urlPrefix += "/"
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}
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cpt.urlPrefix = urlPrefix
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return cpt
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}
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func NewWithFilter(urlPrefix string, store cache.Cache) *Captcha {
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cpt := NewCaptcha(urlPrefix, store)
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// create filter for serve captcha image
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beego.AddFilter(urlPrefix+":", "BeforeRouter", cpt.Handler)
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// add to template func map
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beego.AddFuncMap("create_captcha", cpt.CreateCaptchaHtml)
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return cpt
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}
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484
utils/captcha/image.go
Normal file
484
utils/captcha/image.go
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@ -0,0 +1,484 @@
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package captcha
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import (
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"bytes"
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"image"
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"image/color"
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"image/png"
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"io"
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"math"
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"math/rand"
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"time"
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)
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const (
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fontWidth = 11
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fontHeight = 18
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blackChar = 1
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// Standard width and height of a captcha image.
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stdWidth = 240
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stdHeight = 80
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// Maximum absolute skew factor of a single digit.
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maxSkew = 0.7
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// Number of background circles.
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circleCount = 20
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)
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var font = [][]byte{
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{ // 0
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0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0,
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0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0,
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0, 1, 1, 1, 0, 0, 0, 1, 1, 1, 0,
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0, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0,
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1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0,
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1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1,
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0, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0,
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0, 1, 1, 1, 0, 0, 0, 1, 1, 1, 0,
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0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0,
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0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0,
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},
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{ // 1
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0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
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0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0,
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0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0,
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0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0,
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0, 0, 1, 1, 0, 1, 1, 0, 0, 0, 0,
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0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
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0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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},
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{ // 2
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0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0,
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0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0,
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1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 0,
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0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0,
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0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0,
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0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0,
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0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
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0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0,
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0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0,
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0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0,
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0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0,
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0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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},
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{ // 3
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0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0,
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1, 1, 0, 0, 0, 0, 0, 1, 1, 1, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0,
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0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0,
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0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0,
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0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1,
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1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0,
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0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0,
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},
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{ // 4
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0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0,
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0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0,
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0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0,
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0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 0,
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0, 0, 0, 0, 1, 1, 0, 1, 1, 0, 0,
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0, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0,
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0, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0,
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0, 0, 1, 1, 0, 0, 0, 1, 1, 0, 0,
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0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0,
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0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0,
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1, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0,
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1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0,
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},
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{ // 5
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0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
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0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
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0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0,
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0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1,
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1, 1, 0, 0, 0, 0, 0, 1, 1, 1, 0,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0,
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0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0,
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},
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{ // 6
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0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0,
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0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0,
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0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0,
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0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 0,
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1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0,
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1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 0,
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1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1,
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1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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0, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1,
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0, 1, 1, 1, 0, 0, 0, 1, 1, 1, 0,
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0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0,
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0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0,
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},
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{ // 7
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0,
|
||||
},
|
||||
{ // 8
|
||||
0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0,
|
||||
0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0,
|
||||
0, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1,
|
||||
0, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
0, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
0, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
0, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0,
|
||||
0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0,
|
||||
0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0,
|
||||
0, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0,
|
||||
0, 1, 1, 1, 0, 0, 0, 1, 1, 1, 0,
|
||||
1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1,
|
||||
1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0,
|
||||
0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
|
||||
0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0,
|
||||
},
|
||||
{ // 9
|
||||
0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0,
|
||||
0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0,
|
||||
0, 1, 1, 0, 0, 0, 0, 1, 1, 1, 0,
|
||||
1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0,
|
||||
1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1,
|
||||
0, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1,
|
||||
0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1,
|
||||
0, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0,
|
||||
0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0,
|
||||
0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0,
|
||||
0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0,
|
||||
},
|
||||
}
|
||||
|
||||
type Image struct {
|
||||
*image.Paletted
|
||||
numWidth int
|
||||
numHeight int
|
||||
dotSize int
|
||||
}
|
||||
|
||||
func getrand() *rand.Rand {
|
||||
return rand.New(rand.NewSource(time.Now().UnixNano()))
|
||||
}
|
||||
|
||||
func randIntn(max int) int {
|
||||
return getrand().Intn(max)
|
||||
}
|
||||
|
||||
func randInt(min, max int) int {
|
||||
return getrand().Intn(max-min) + min
|
||||
}
|
||||
|
||||
func randFloat(min, max float64) float64 {
|
||||
return (max-min)*getrand().Float64() + min
|
||||
}
|
||||
|
||||
func randomPalette() color.Palette {
|
||||
p := make([]color.Color, circleCount+1)
|
||||
// Transparent color.
|
||||
p[0] = color.RGBA{0xFF, 0xFF, 0xFF, 0x00}
|
||||
// Primary color.
|
||||
prim := color.RGBA{
|
||||
uint8(randIntn(129)),
|
||||
uint8(randIntn(129)),
|
||||
uint8(randIntn(129)),
|
||||
0xFF,
|
||||
}
|
||||
p[1] = prim
|
||||
// Circle colors.
|
||||
for i := 2; i <= circleCount; i++ {
|
||||
p[i] = randomBrightness(prim, 255)
|
||||
}
|
||||
return p
|
||||
}
|
||||
|
||||
// NewImage returns a new captcha image of the given width and height with the
|
||||
// given digits, where each digit must be in range 0-9.
|
||||
func NewImage(digits []byte, width, height int) *Image {
|
||||
m := new(Image)
|
||||
m.Paletted = image.NewPaletted(image.Rect(0, 0, width, height), randomPalette())
|
||||
m.calculateSizes(width, height, len(digits))
|
||||
// Randomly position captcha inside the image.
|
||||
maxx := width - (m.numWidth+m.dotSize)*len(digits) - m.dotSize
|
||||
maxy := height - m.numHeight - m.dotSize*2
|
||||
var border int
|
||||
if width > height {
|
||||
border = height / 5
|
||||
} else {
|
||||
border = width / 5
|
||||
}
|
||||
x := randInt(border, maxx-border)
|
||||
y := randInt(border, maxy-border)
|
||||
// Draw digits.
|
||||
for _, n := range digits {
|
||||
m.drawDigit(font[n], x, y)
|
||||
x += m.numWidth + m.dotSize
|
||||
}
|
||||
// Draw strike-through line.
|
||||
m.strikeThrough()
|
||||
// Apply wave distortion.
|
||||
m.distort(randFloat(5, 10), randFloat(100, 200))
|
||||
// Fill image with random circles.
|
||||
m.fillWithCircles(circleCount, m.dotSize)
|
||||
return m
|
||||
}
|
||||
|
||||
// encodedPNG encodes an image to PNG and returns
|
||||
// the result as a byte slice.
|
||||
func (m *Image) encodedPNG() []byte {
|
||||
var buf bytes.Buffer
|
||||
if err := png.Encode(&buf, m.Paletted); err != nil {
|
||||
panic(err.Error())
|
||||
}
|
||||
return buf.Bytes()
|
||||
}
|
||||
|
||||
// WriteTo writes captcha image in PNG format into the given writer.
|
||||
func (m *Image) WriteTo(w io.Writer) (int64, error) {
|
||||
n, err := w.Write(m.encodedPNG())
|
||||
return int64(n), err
|
||||
}
|
||||
|
||||
func (m *Image) calculateSizes(width, height, ncount int) {
|
||||
// Goal: fit all digits inside the image.
|
||||
var border int
|
||||
if width > height {
|
||||
border = height / 4
|
||||
} else {
|
||||
border = width / 4
|
||||
}
|
||||
// Convert everything to floats for calculations.
|
||||
w := float64(width - border*2)
|
||||
h := float64(height - border*2)
|
||||
// fw takes into account 1-dot spacing between digits.
|
||||
fw := float64(fontWidth + 1)
|
||||
fh := float64(fontHeight)
|
||||
nc := float64(ncount)
|
||||
// Calculate the width of a single digit taking into account only the
|
||||
// width of the image.
|
||||
nw := w / nc
|
||||
// Calculate the height of a digit from this width.
|
||||
nh := nw * fh / fw
|
||||
// Digit too high?
|
||||
if nh > h {
|
||||
// Fit digits based on height.
|
||||
nh = h
|
||||
nw = fw / fh * nh
|
||||
}
|
||||
// Calculate dot size.
|
||||
m.dotSize = int(nh / fh)
|
||||
// Save everything, making the actual width smaller by 1 dot to account
|
||||
// for spacing between digits.
|
||||
m.numWidth = int(nw) - m.dotSize
|
||||
m.numHeight = int(nh)
|
||||
}
|
||||
|
||||
func (m *Image) drawHorizLine(fromX, toX, y int, colorIdx uint8) {
|
||||
for x := fromX; x <= toX; x++ {
|
||||
m.SetColorIndex(x, y, colorIdx)
|
||||
}
|
||||
}
|
||||
|
||||
func (m *Image) drawCircle(x, y, radius int, colorIdx uint8) {
|
||||
f := 1 - radius
|
||||
dfx := 1
|
||||
dfy := -2 * radius
|
||||
xo := 0
|
||||
yo := radius
|
||||
|
||||
m.SetColorIndex(x, y+radius, colorIdx)
|
||||
m.SetColorIndex(x, y-radius, colorIdx)
|
||||
m.drawHorizLine(x-radius, x+radius, y, colorIdx)
|
||||
|
||||
for xo < yo {
|
||||
if f >= 0 {
|
||||
yo--
|
||||
dfy += 2
|
||||
f += dfy
|
||||
}
|
||||
xo++
|
||||
dfx += 2
|
||||
f += dfx
|
||||
m.drawHorizLine(x-xo, x+xo, y+yo, colorIdx)
|
||||
m.drawHorizLine(x-xo, x+xo, y-yo, colorIdx)
|
||||
m.drawHorizLine(x-yo, x+yo, y+xo, colorIdx)
|
||||
m.drawHorizLine(x-yo, x+yo, y-xo, colorIdx)
|
||||
}
|
||||
}
|
||||
|
||||
func (m *Image) fillWithCircles(n, maxradius int) {
|
||||
maxx := m.Bounds().Max.X
|
||||
maxy := m.Bounds().Max.Y
|
||||
for i := 0; i < n; i++ {
|
||||
colorIdx := uint8(randInt(1, circleCount-1))
|
||||
r := randInt(1, maxradius)
|
||||
m.drawCircle(randInt(r, maxx-r), randInt(r, maxy-r), r, colorIdx)
|
||||
}
|
||||
}
|
||||
|
||||
func (m *Image) strikeThrough() {
|
||||
maxx := m.Bounds().Max.X
|
||||
maxy := m.Bounds().Max.Y
|
||||
y := randInt(maxy/3, maxy-maxy/3)
|
||||
amplitude := randFloat(5, 20)
|
||||
period := randFloat(80, 180)
|
||||
dx := 2.0 * math.Pi / period
|
||||
for x := 0; x < maxx; x++ {
|
||||
xo := amplitude * math.Cos(float64(y)*dx)
|
||||
yo := amplitude * math.Sin(float64(x)*dx)
|
||||
for yn := 0; yn < m.dotSize; yn++ {
|
||||
r := randInt(0, m.dotSize)
|
||||
m.drawCircle(x+int(xo), y+int(yo)+(yn*m.dotSize), r/2, 1)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func (m *Image) drawDigit(digit []byte, x, y int) {
|
||||
skf := randFloat(-maxSkew, maxSkew)
|
||||
xs := float64(x)
|
||||
r := m.dotSize / 2
|
||||
y += randInt(-r, r)
|
||||
for yo := 0; yo < fontHeight; yo++ {
|
||||
for xo := 0; xo < fontWidth; xo++ {
|
||||
if digit[yo*fontWidth+xo] != blackChar {
|
||||
continue
|
||||
}
|
||||
m.drawCircle(x+xo*m.dotSize, y+yo*m.dotSize, r, 1)
|
||||
}
|
||||
xs += skf
|
||||
x = int(xs)
|
||||
}
|
||||
}
|
||||
|
||||
func (m *Image) distort(amplude float64, period float64) {
|
||||
w := m.Bounds().Max.X
|
||||
h := m.Bounds().Max.Y
|
||||
|
||||
oldm := m.Paletted
|
||||
newm := image.NewPaletted(image.Rect(0, 0, w, h), oldm.Palette)
|
||||
|
||||
dx := 2.0 * math.Pi / period
|
||||
for x := 0; x < w; x++ {
|
||||
for y := 0; y < h; y++ {
|
||||
xo := amplude * math.Sin(float64(y)*dx)
|
||||
yo := amplude * math.Cos(float64(x)*dx)
|
||||
newm.SetColorIndex(x, y, oldm.ColorIndexAt(x+int(xo), y+int(yo)))
|
||||
}
|
||||
}
|
||||
m.Paletted = newm
|
||||
}
|
||||
|
||||
func randomBrightness(c color.RGBA, max uint8) color.RGBA {
|
||||
minc := min3(c.R, c.G, c.B)
|
||||
maxc := max3(c.R, c.G, c.B)
|
||||
if maxc > max {
|
||||
return c
|
||||
}
|
||||
n := randIntn(int(max-maxc)) - int(minc)
|
||||
return color.RGBA{
|
||||
uint8(int(c.R) + n),
|
||||
uint8(int(c.G) + n),
|
||||
uint8(int(c.B) + n),
|
||||
uint8(c.A),
|
||||
}
|
||||
}
|
||||
|
||||
func min3(x, y, z uint8) (m uint8) {
|
||||
m = x
|
||||
if y < m {
|
||||
m = y
|
||||
}
|
||||
if z < m {
|
||||
m = z
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
func max3(x, y, z uint8) (m uint8) {
|
||||
m = x
|
||||
if y > m {
|
||||
m = y
|
||||
}
|
||||
if z > m {
|
||||
m = z
|
||||
}
|
||||
return
|
||||
}
|
||||
38
utils/captcha/image_test.go
Normal file
38
utils/captcha/image_test.go
Normal file
@ -0,0 +1,38 @@
|
||||
package captcha
|
||||
|
||||
import (
|
||||
"testing"
|
||||
|
||||
"github.com/astaxie/beego/utils"
|
||||
)
|
||||
|
||||
type byteCounter struct {
|
||||
n int64
|
||||
}
|
||||
|
||||
func (bc *byteCounter) Write(b []byte) (int, error) {
|
||||
bc.n += int64(len(b))
|
||||
return len(b), nil
|
||||
}
|
||||
|
||||
func BenchmarkNewImage(b *testing.B) {
|
||||
b.StopTimer()
|
||||
d := utils.RandomCreateBytes(challengeNums, defaultChars...)
|
||||
b.StartTimer()
|
||||
for i := 0; i < b.N; i++ {
|
||||
NewImage(d, stdWidth, stdHeight)
|
||||
}
|
||||
}
|
||||
|
||||
func BenchmarkImageWriteTo(b *testing.B) {
|
||||
b.StopTimer()
|
||||
d := utils.RandomCreateBytes(challengeNums, defaultChars...)
|
||||
b.StartTimer()
|
||||
counter := &byteCounter{}
|
||||
for i := 0; i < b.N; i++ {
|
||||
img := NewImage(d, stdWidth, stdHeight)
|
||||
img.WriteTo(counter)
|
||||
b.SetBytes(counter.n)
|
||||
counter.n = 0
|
||||
}
|
||||
}
|
||||
20
utils/rand.go
Normal file
20
utils/rand.go
Normal file
@ -0,0 +1,20 @@
|
||||
package utils
|
||||
|
||||
import (
|
||||
"crypto/rand"
|
||||
)
|
||||
|
||||
// RandomCreateBytes generate random []byte by specify chars.
|
||||
func RandomCreateBytes(n int, alphabets ...byte) []byte {
|
||||
const alphanum = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
|
||||
var bytes = make([]byte, n)
|
||||
rand.Read(bytes)
|
||||
for i, b := range bytes {
|
||||
if len(alphabets) == 0 {
|
||||
bytes[i] = alphanum[b%byte(len(alphanum))]
|
||||
} else {
|
||||
bytes[i] = alphabets[b%byte(len(alphabets))]
|
||||
}
|
||||
}
|
||||
return bytes
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user