-
-
Notifications
You must be signed in to change notification settings - Fork 0
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
- Loading branch information
1 parent
5a6b322
commit 9f44e7b
Showing
6 changed files
with
122 additions
and
12 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,93 @@ | ||
| package lib | ||
|
|
||
| import ( | ||
| "crypto/rand" | ||
| "encoding/hex" | ||
| "errors" | ||
| "image" | ||
| "image/color" | ||
| "image/png" | ||
| "io" | ||
| "os" | ||
| "path/filepath" | ||
|
|
||
| "github.com/boombuler/barcode" | ||
| "github.com/boombuler/barcode/qr" | ||
| ) | ||
|
|
||
| func TempFilename(prefix string, extension string) string { | ||
| randBytes := make([]byte, 16) | ||
| rand.Read(randBytes) | ||
| return filepath.Join(os.TempDir(), prefix+hex.EncodeToString(randBytes)+extension) | ||
| } | ||
|
|
||
| func GenerateQR(uuid, input string) (string, error) { | ||
| //log.Println("Original data:", base64) | ||
| code, err := qr.Encode(input, qr.L, qr.Unicode) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| //log.Println("Encoded data: ", code.Content()) | ||
|
|
||
| if input != code.Content() { | ||
| return "", errors.New("data differs") | ||
| } | ||
|
|
||
| code, err = barcode.Scale(code, 60, 60) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| printPng(os.Stdout, code) | ||
|
|
||
| code, err = barcode.Scale(code, 600, 600) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| output := TempFilename(uuid, ".png") | ||
| writePng(output, code) | ||
|
|
||
| //log.Println(`Now open test.png and scan QR code, it will be: "IAV19ysYSl0HUuG5QiCDvdHkowqdGXb0HbqUAWUzHw==" instead of "IAV19ysYSl0HUuG5QiCDvdHkowqdGXb0HbaUAWUzHw==" ('a' is changed to 'q' in 'aUAWUzHw==' part)`) | ||
| return output, nil | ||
| } | ||
|
|
||
| const BLACK = "\033[40m \033[0m" | ||
| const WHITE = "\033[47m \033[0m" | ||
|
|
||
| func printPng(writer io.Writer, img image.Image) error { | ||
|
|
||
| // Create a new grayscale image | ||
| bounds := img.Bounds() | ||
| w, h := bounds.Max.X, bounds.Max.Y | ||
|
|
||
| for y := 11; y < h-14; y++ { | ||
| for x := 12; x < w-13; x++ { | ||
| if img.At(x, y) == color.White && img.At(x, y+1) == color.White { | ||
| writer.Write([]byte(WHITE)) | ||
| } else if img.At(x, y) == color.White && img.At(x, y+1) == color.Black { | ||
| writer.Write([]byte(BLACK)) | ||
| } else if img.At(x, y) == color.Black && img.At(x, y+1) == color.White { | ||
| writer.Write([]byte(WHITE)) | ||
| } else { | ||
| writer.Write([]byte(BLACK)) | ||
| } | ||
| } | ||
| writer.Write([]byte("\n")) | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func writePng(filename string, img image.Image) error { | ||
| file, err := os.Create(filename) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| defer file.Close() | ||
|
|
||
| err = png.Encode(file, img) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| return nil | ||
| } |