Initial captcha image generation

go.mod

@@ -4,7 +4,7 @@ go 1.22.5
 
 require (
 	github.com/dustin/go-humanize v1.0.1 // indirect
-	github.com/fogleman/gg v1.3.0 // indirect
+	github.com/fogleman/gg v1.3.0 
 	github.com/glebarez/go-sqlite v1.22.0 // indirect
 	github.com/go-telegram/bot v1.5.0 // indirect
 	github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 // indirect

src/captcha.go

@@ -0,0 +1,29 @@
+package main
+
+import (
+	"embed"
+	"image/color"
+
+	"github.com/fogleman/gg"
+)
+
+var (
+	res embed.FS
+)
+
+func GenCaptcha() {
+	dc := gg.NewContext(400, 300)
+	gd := gg.NewLinearGradient(0, 0, 400, 300)
+	gd.AddColorStop(0, color.RGBA{189, 24, 229, 255})
+	gd.AddColorStop(1, color.RGBA{27, 21, 123, 255})
+	dc.SetFillStyle(gd)
+	dc.DrawRectangle(0, 0, 400, 300)
+	dc.Fill()
+	dc.SetRGBA(0, 0, 0, 0.05)
+	dc.SetLineWidth(27)
+	for i := 0.0; i < 20; i += 1 {
+		dc.DrawLine(i * 70, -100, i * 70 - 500, 400)
+		dc.Stroke()
+	}
+	dc.SavePNG("grad.png")
+}

src/handlers.go

@@ -148,7 +148,6 @@ func handlePrivateStartCaptcha(ctx context.Context, b *bot.Bot, u *models.Update
 			return
 		}
 	}
-
 	if captcha.CorrectAnswer == 0 {
 		captcha.CorrectAnswer = 42
 		msg, err := b.SendMessage(ctx, &bot.SendMessageParams{

src/main.go

@@ -14,6 +14,7 @@ import (
 )
 
 func main() {
+	GenCaptcha()
 	ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt)
 	defer cancel()