upgrade macaron/captcha to fix random error problem (#7407)

vendor/github.com/go-macaron/captcha/.travis.yml

@@ -1,14 +1,10 @@
 sudo: false
 language: go
-
 go:
-  - 1.3
-  - 1.4
-  - 1.5
-  - tip
+  - 1.6.x
+  - 1.7.x
+  - 1.8.x
+  - 1.9.x
+  - 1.10.x
 
 script: go test -v -cover -race
-
-notifications:
-  email:
-    - u@gogs.io

vendor/github.com/go-macaron/captcha/captcha.go

@@ -19,6 +19,7 @@ package captcha
 import (
 	"fmt"
 	"html/template"
+	"image/color"
 	"path"
 	"strings"
 
@@ -49,6 +50,7 @@ type Captcha struct {
 	ChallengeNums    int
 	Expiration       int64
 	CachePrefix      string
+	ColorPalette     color.Palette
 }
 
 // generate key string
@@ -61,16 +63,21 @@ func (c *Captcha) genRandChars() string {
 	return string(com.RandomCreateBytes(c.ChallengeNums, defaultChars...))
 }
 
-// tempalte func for output html
-func (c *Captcha) CreateHtml() template.HTML {
+// CreateHTML outputs HTML for display and fetch new captcha images.
+func (c *Captcha) CreateHTML() template.HTML {
 	value, err := c.CreateCaptcha()
 	if err != nil {
 		panic(fmt.Errorf("fail to create captcha: %v", err))
 	}
-	return template.HTML(fmt.Sprintf(`<input type="hidden" name="%s" value="%s">
-	<a class="captcha" href="javascript:">
-		<img onclick="this.src=('%s%s%s.png?reload='+(new Date()).getTime())" class="captcha-img" src="%s%s%s.png">
-	</a>`, c.FieldIdName, value, c.SubURL, c.URLPrefix, value, c.SubURL, c.URLPrefix, value))
+	return template.HTML(fmt.Sprintf(`<input type="hidden" name="%[1]s" value="%[2]s">
+	<a class="captcha" href="javascript:" tabindex="-1">
+		<img onclick="this.src=('%[3]s%[4]s%[2]s.png?reload='+(new Date()).getTime())" class="captcha-img" src="%[3]s%[4]s%[2]s.png">
+	</a>`, c.FieldIdName, value, c.SubURL, c.URLPrefix))
+}
+
+// DEPRECATED
+func (c *Captcha) CreateHtml() template.HTML {
+	return c.CreateHTML()
 }
 
 // create a new captcha id
@@ -139,6 +146,9 @@ type Options struct {
 	Expiration int64
 	// Cache key prefix captcha characters. Default is "captcha_".
 	CachePrefix string
+	// ColorPalette holds a collection of primary colors used for
+	// the captcha's text. If not defined, a random color will be generated.
+	ColorPalette color.Palette
 }
 
 func prepareOptions(options []Options) Options {
@@ -192,6 +202,7 @@ func NewCaptcha(opt Options) *Captcha {
 		ChallengeNums:    opt.ChallengeNums,
 		Expiration:       opt.Expiration,
 		CachePrefix:      opt.CachePrefix,
+		ColorPalette:     opt.ColorPalette,
 	}
 }
 
@@ -229,9 +240,10 @@ func Captchaer(options ...Options) macaron.Handler {
 				}
 			}
 
-			if _, err := NewImage([]byte(chars), cpt.StdWidth, cpt.StdHeight).WriteTo(ctx.Resp); err != nil {
+			if _, err := NewImage([]byte(chars), cpt.StdWidth, cpt.StdHeight, cpt.ColorPalette).WriteTo(ctx.Resp); err != nil {
 				panic(fmt.Errorf("write captcha: %v", err))
 			}
+			ctx.Status(200)
 			return
 		}
 

vendor/github.com/go-macaron/captcha/image.go

@@ -265,16 +265,22 @@ func randFloat(from, to float64) float64 {
 	return (to-from)*prng.Float64() + from
 }
 
-func randomPalette() color.Palette {
+func randomPalette(primary color.Palette) 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,
+	var prim color.RGBA
+	if len(primary) == 0 {
+		prim = color.RGBA{
+			uint8(randIntn(129)),
+			uint8(randIntn(129)),
+			uint8(randIntn(129)),
+			0xFF,
+		}
+	} else {
+		r, g, b, a := primary[randIntn(len(primary)-1)].RGBA()
+		prim = color.RGBA{uint8(r), uint8(g), uint8(b), uint8(a)}
 	}
 	p[1] = prim
 	// Circle colors.
@@ -285,10 +291,11 @@ func randomPalette() color.Palette {
 }
 
 // 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 {
+// given digits, where each digit must be in range 0-9. The digit's color is
+// chosen by random from the colorPalette.
+func NewImage(digits []byte, width, height int, colorPalette color.Palette) *Image {
 	m := new(Image)
-	m.Paletted = image.NewPaletted(image.Rect(0, 0, width, height), randomPalette())
+	m.Paletted = image.NewPaletted(image.Rect(0, 0, width, height), randomPalette(colorPalette))
 	m.calculateSizes(width, height, len(digits))
 	// Randomly position captcha inside the image.
 	maxx := width - (m.numWidth+m.dotSize)*len(digits) - m.dotSize