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-rw-r--r--main.go48
1 files changed, 33 insertions, 15 deletions
diff --git a/main.go b/main.go
index 28a859d..e2bd74b 100644
--- a/main.go
+++ b/main.go
@@ -16,24 +16,21 @@ import (
var usernamePattern = regexp.MustCompile("[a-zA-Z][a-zA-Z0-9]+")
func main() {
- username := flag.String("username", "", "username to encode as image")
+ username := flag.String("username", "", "username to encode as image (must contain only letters a-zA-Z0-9 and start with a letter)")
flag.Parse()
if strings.TrimSpace(*username) == "" {
- fmt.Println("no username")
+ flag.Usage()
return
}
+
if !usernamePattern.MatchString(*username) {
- fmt.Println("no match")
+ flag.Usage()
return
}
seed := hash(*username)
- err, img := generateImage(seed)
- if err != nil {
- fmt.Printf("%v\n", err)
- return
- }
- err, str := encodeImage(img)
+ img := repeat(generateImage(seed))
+ str, err := encodeImage(img)
if err != nil {
fmt.Printf("%v\n", err)
return
@@ -45,7 +42,7 @@ func hash(username string) [32]byte {
return sha256.Sum256([]byte(username))
}
-func generateImage(hash [32]byte) (error, image.Image) {
+func generateImage(hash [32]byte) image.Image {
img := image.NewNRGBA(image.Rect(0, 0, 5, 5))
colorA := color.NRGBA{
R: hash[0],
@@ -62,7 +59,7 @@ func generateImage(hash [32]byte) (error, image.Image) {
offset := 6
for x := 0; x < 5; x++ {
for y := 0; y < 5; y++ {
- on := hash[offset]&0xf0 > 0
+ on := hash[offset] > 127
color := colorA
if on {
color = colorB
@@ -71,13 +68,34 @@ func generateImage(hash [32]byte) (error, image.Image) {
offset++
}
}
- return nil, img
+ return img
}
-func encodeImage(img image.Image) (error, string) {
+func encodeImage(img image.Image) (string, error) {
var b bytes.Buffer
if err := png.Encode(&b, img); err != nil {
- return err, ""
+ return "", err
+ }
+ return base64.StdEncoding.EncodeToString(b.Bytes()), nil
+}
+
+func repeat(img image.Image) image.Image {
+ newImg := image.NewNRGBA(image.Rect(0, 0, 10, 10))
+ for x := 0; x < 5; x++ {
+ for y := 0; y < 5; y++ {
+ newImg.Set(x, y, img.At(x, y))
+ newImg.Set(9-x, y, img.At(x, y))
+ newImg.Set(x, 9-y, img.At(x, y))
+ newImg.Set(9-x, 9-y, img.At(x, y))
+ }
}
- return nil, base64.StdEncoding.EncodeToString(b.Bytes())
+ return newImg
}
+
+// func makeBigger(img image.Image) image.Image {
+// newImg := image.NewNRGBA(image.Rect(0, 0, 200, 200))
+// for x := 0; x < 10; x++ {
+// for y := 0; y < 10; y++ {
+// }
+// }
+// }