mirror of
https://github.com/kongyuebin1/dongfeng-pay.git
synced 2024-11-17 07:59:19 +08:00
441 lines
8.9 KiB
Go
441 lines
8.9 KiB
Go
/***************************************************
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** @Desc : generate login verify code image
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** @Time : 2019/8/7 17:14
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** @Author : yuebin
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** @File : login_verify_code
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** @Last Modified by : yuebin
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** @Last Modified time: 2019/8/7 17:14
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** @Software: GoLand
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****************************************************/
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package utils
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import (
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crand "crypto/rand"
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"image"
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"image/color"
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"math/rand"
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"time"
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"io"
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"image/png"
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"net/http"
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"strconv"
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"fmt"
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)
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const (
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stdWidth = 100
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stdHeight = 40
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maxSkew = 2
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)
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const (
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fontWidth = 5
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fontHeight = 8
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blackChar = 1
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)
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var font = [][]byte{
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{ // 0
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0, 1, 1, 1, 0,
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1, 0, 0, 0, 1,
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1, 0, 0, 0, 1,
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1, 0, 0, 0, 1,
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1, 0, 0, 0, 1,
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1, 0, 0, 0, 1,
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1, 0, 0, 0, 1,
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0, 1, 1, 1, 0},
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{ // 1
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0, 0, 1, 0, 0,
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0, 1, 1, 0, 0,
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1, 0, 1, 0, 0,
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0, 0, 1, 0, 0,
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0, 0, 1, 0, 0,
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0, 0, 1, 0, 0,
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0, 0, 1, 0, 0,
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1, 1, 1, 1, 1},
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{ // 2
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0, 1, 1, 1, 0,
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1, 0, 0, 0, 1,
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0, 0, 0, 0, 1,
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0, 0, 0, 1, 1,
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0, 1, 1, 0, 0,
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1, 0, 0, 0, 0,
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1, 0, 0, 0, 0,
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1, 1, 1, 1, 1},
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{ // 3
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1, 1, 1, 1, 0,
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0, 0, 0, 0, 1,
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0, 0, 0, 1, 0,
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0, 1, 1, 1, 0,
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0, 0, 0, 1, 0,
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0, 0, 0, 0, 1,
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0, 0, 0, 0, 1,
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1, 1, 1, 1, 0},
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{ // 4
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1, 0, 0, 1, 0,
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1, 0, 0, 1, 0,
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1, 0, 0, 1, 0,
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1, 0, 0, 1, 0,
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1, 1, 1, 1, 1,
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0, 0, 0, 1, 0,
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0, 0, 0, 1, 0,
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0, 0, 0, 1, 0},
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{ // 5
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1, 1, 1, 1, 1,
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1, 0, 0, 0, 0,
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1, 0, 0, 0, 0,
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1, 1, 1, 1, 0,
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0, 0, 0, 0, 1,
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0, 0, 0, 0, 1,
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0, 0, 0, 0, 1,
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1, 1, 1, 1, 0},
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{ // 6
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0, 0, 1, 1, 1,
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0, 1, 0, 0, 0,
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1, 0, 0, 0, 0,
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1, 1, 1, 1, 0,
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1, 0, 0, 0, 1,
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1, 0, 0, 0, 1,
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1, 0, 0, 0, 1,
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0, 1, 1, 1, 0},
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{ // 7
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1, 1, 1, 1, 1,
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0, 0, 0, 0, 1,
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0, 0, 0, 0, 1,
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0, 0, 0, 1, 0,
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0, 0, 1, 0, 0,
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0, 1, 0, 0, 0,
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0, 1, 0, 0, 0,
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0, 1, 0, 0, 0},
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{ // 8
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0, 1, 1, 1, 0,
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1, 0, 0, 0, 1,
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1, 0, 0, 0, 1,
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0, 1, 1, 1, 0,
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1, 0, 0, 0, 1,
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1, 0, 0, 0, 1,
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1, 0, 0, 0, 1,
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0, 1, 1, 1, 0},
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{ // 9
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0, 1, 1, 1, 0,
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1, 0, 0, 0, 1,
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1, 0, 0, 0, 1,
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1, 1, 0, 0, 1,
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0, 1, 1, 1, 1,
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0, 0, 0, 0, 1,
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0, 0, 0, 0, 1,
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1, 1, 1, 1, 0},
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}
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type Image struct {
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*image.NRGBA
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color *color.NRGBA
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width int //a digit width
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height int //a digit height
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dotsize int
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}
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func init() {
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rand.Seed(int64(time.Second))
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}
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func NewImage(digits []byte, width, height int) *Image {
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img := new(Image)
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r := image.Rect(img.width, img.height, stdWidth, stdHeight)
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img.NRGBA = image.NewNRGBA(r)
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img.color = &color.NRGBA{
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uint8(rand.Intn(129)),
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uint8(rand.Intn(129)),
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uint8(rand.Intn(129)),
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0xFF}
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// Draw background (10 random circles of random brightness)
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img.calculateSizes(width, height, len(digits))
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img.fillWithCircles(0, img.dotsize)
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maxx := width - (img.width+img.dotsize)*len(digits) - img.dotsize
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maxy := height - img.height - img.dotsize*2
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x := rnd(img.dotsize*2, maxx)
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y := rnd(img.dotsize*2, maxy)
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// Draw digits.
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for _, n := range digits {
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img.drawDigit(font[n], x, y)
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x += img.width + img.dotsize
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}
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// Draw strike-through line.
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//img.strikeThrough()
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return img
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}
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func (img *Image) WriteTo(w io.Writer) (int64, error) {
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return 0, png.Encode(w, img)
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}
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func (img *Image) calculateSizes(width, height, ncount int) {
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// Goal: fit all digits inside the image.
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var border int
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if width > height {
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border = height / 5
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} else {
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border = width / 5
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}
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// Convert everything to floats for calculations.
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w := float64(width - border*2) //268
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h := float64(height - border*2) //48
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// fw takes into account 1-dot spacing between digits.
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fw := float64(fontWidth) + 1 //6
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fh := float64(fontHeight) //8
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nc := float64(ncount) //7
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// Calculate the width of a single digit taking into account only the
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// width of the image.
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nw := w / nc //38
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// Calculate the height of a digit from this width.
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nh := nw * fh / fw //51
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// Digit too high?
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if nh > h {
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// Fit digits based on height.
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nh = h //nh = 44
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nw = fw / fh * nh
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}
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// Calculate dot size.
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img.dotsize = int(nh / fh)
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// Save everything, making the actual width smaller by 1 dot to account
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// for spacing between digits.
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img.width = int(nw)
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img.height = int(nh) - img.dotsize
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}
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func (img *Image) fillWithCircles(n, maxradius int) {
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color := img.color
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maxx := img.Bounds().Max.X
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maxy := img.Bounds().Max.Y
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for i := 0; i < n; i++ {
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setRandomBrightness(color, 255)
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r := rnd(3, maxradius)
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img.drawCircle(color, rnd(r, maxx-r), rnd(r, maxy-r), r)
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}
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}
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func (img *Image) drawHorizLine(color color.Color, fromX, toX, y int) {
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for x := fromX; x <= toX; x++ {
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img.Set(x, y, color)
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}
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}
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func (img *Image) drawCircle(color color.Color, x, y, radius int) {
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f := 1 - radius
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dfx := 1
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dfy := -2 * radius
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xx := 0
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yy := radius
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img.Set(x, y+radius, color)
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img.Set(x, y-radius, color)
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img.drawHorizLine(color, x-radius, x+radius, y)
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for xx < yy {
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if f >= 0 {
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yy--
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dfy += 2
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f += dfy
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}
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xx++
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dfx += 2
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f += dfx
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img.drawHorizLine(color, x-xx, x+xx, y+yy)
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img.drawHorizLine(color, x-xx, x+xx, y-yy)
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img.drawHorizLine(color, x-yy, x+yy, y+xx)
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img.drawHorizLine(color, x-yy, x+yy, y-xx)
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}
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}
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func (img *Image) strikeThrough() {
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r := 0
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maxx := img.Bounds().Max.X
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maxy := img.Bounds().Max.Y
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y := rnd(maxy/3, maxy-maxy/3)
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for x := 0; x < maxx; x += r {
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r = rnd(1, img.dotsize/3)
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y += rnd(-img.dotsize/2, img.dotsize/2)
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if y <= 0 || y >= maxy {
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y = rnd(maxy/3, maxy-maxy/3)
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}
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img.drawCircle(img.color, x, y, r)
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}
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}
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func (img *Image) drawDigit(digit []byte, x, y int) {
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skf := rand.Float64() * float64(rnd(-maxSkew, maxSkew))
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xs := float64(x)
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minr := img.dotsize / 2 // minumum radius
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maxr := img.dotsize/2 + img.dotsize/4 // maximum radius
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y += rnd(-minr, minr)
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for yy := 0; yy < fontHeight; yy++ {
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for xx := 0; xx < fontWidth; xx++ {
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if digit[yy*fontWidth+xx] != blackChar {
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continue
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}
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// Introduce random variations.
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or := rnd(minr, maxr)
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ox := x + (xx * img.dotsize) + rnd(0, or/2)
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oy := y + (yy * img.dotsize) + rnd(0, or/2)
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img.drawCircle(img.color, ox, oy, or)
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}
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xs += skf
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x = int(xs)
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}
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}
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func setRandomBrightness(c *color.NRGBA, max uint8) {
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minc := min3(c.R, c.G, c.B)
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maxc := max3(c.R, c.G, c.B)
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if maxc > max {
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return
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}
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n := rand.Intn(int(max-maxc)) - int(minc)
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c.R = uint8(int(c.R) + n)
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c.G = uint8(int(c.G) + n)
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c.B = uint8(int(c.B) + n)
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}
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func min3(x, y, z uint8) (o uint8) {
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o = x
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if y < o {
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o = y
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}
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if z < o {
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o = z
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}
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return
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}
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func max3(x, y, z uint8) (o uint8) {
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o = x
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if y > o {
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o = y
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}
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if z > o {
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o = z
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}
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return
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}
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// rnd returns a random number in range [from, to].
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func rnd(from, to int) int {
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//println(to+1-from)
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return rand.Intn(to+1-from) + from
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}
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const (
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// Standard length of uniuri string to achive ~95 bits of entropy.
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StdLen = 16
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// Length of uniurl string to achive ~119 bits of entropy, closest
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// to what can be losslessly converted to UUIDv4 (122 bits).
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UUIDLen = 20
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)
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// Standard characters allowed in uniuri string.
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var StdChars = []byte("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789")
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// New returns a new random string of the standard length, consisting of
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// standard characters.
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func New() string {
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return NewLenChars(StdLen, StdChars)
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}
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// NewLen returns a new random string of the provided length, consisting of
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// standard characters.
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func NewLen(length int) string {
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return NewLenChars(length, StdChars)
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}
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// NewLenChars returns a new random string of the provided length, consisting
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// of the provided byte slice of allowed characters (maximum 256).
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func NewLenChars(length int, chars []byte) string {
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b := make([]byte, length)
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r := make([]byte, length+(length/4)) // storage for random bytes.
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clen := byte(len(chars))
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maxrb := byte(256 - (256 % len(chars)))
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i := 0
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for {
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if _, err := io.ReadFull(crand.Reader, r); err != nil {
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panic("error reading from random source: " + err.Error())
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}
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for _, c := range r {
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if c >= maxrb {
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// Skip this number to avoid modulo bias.
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continue
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}
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b[i] = chars[c%clen]
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i++
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if i == length {
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return string(b)
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}
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}
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}
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panic("unreachable")
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}
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func GenerateVerifyCodeImg() (*Image, string) {
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d := make([]byte, 4)
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s := NewLen(4)
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ss := ""
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d = []byte(s)
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for v := range d {
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d[v] %= 10
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ss += strconv.FormatInt(int64(d[v]), 32)
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}
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return NewImage(d, 100, 40), ss
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}
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func pic(w http.ResponseWriter, req *http.Request) {
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d := make([]byte, 4)
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s := NewLen(4)
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ss := ""
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d = []byte(s)
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for v := range d {
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d[v] %= 10
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ss += strconv.FormatInt(int64(d[v]), 32)
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}
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w.Header().Set("Content-Type", "image/png")
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NewImage(d, 100, 40).WriteTo(w)
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fmt.Println(ss)
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}
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func index(w http.ResponseWriter, req *http.Request) {
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str := "<meta charset=\"utf-8\"><h3>golang 图片验证码例子</h3><img border=\"1\" src=\"/pic\" alt=\"图片验证码\" onclick=\"this.src='/pic'\" />"
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w.Header().Set("Content-Type", "text/html")
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w.Write([]byte(str))
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}
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func main() {
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http.HandleFunc("/pic", pic)
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http.HandleFunc("/", index)
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s := &http.Server{
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Addr: ":8080",
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ReadTimeout: 30 * time.Second,
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WriteTimeout: 30 * time.Second,
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MaxHeaderBytes: 1 << 20}
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s.ListenAndServe()
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}
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