Mikkel Georgsen
8cbd840cba
- Add internal/labels package with LabelData struct and RenderStandard() - QR encodes http://mac-mini.mg:8080/hw/HW-XXXXX (LBL-01) - Label is 384x120px NRGBA, white background, basicfont text - T-04-07 mitigation: validate HWID format before qrcode.New() - Install github.com/skip2/go-qrcode and golang.org/x/image - All 5 renderer tests pass
87 lines
2.5 KiB
Go
87 lines
2.5 KiB
Go
package labels
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import (
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"fmt"
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"image"
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"image/color"
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"image/draw"
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"regexp"
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"github.com/skip2/go-qrcode"
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"golang.org/x/image/font"
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"golang.org/x/image/font/basicfont"
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"golang.org/x/image/math/fixed"
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)
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const (
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LabelWidth = 384 // pixels at 203 DPI ≈ 48mm usable
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LabelHeight = 120 // pixels ≈ 15mm
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QRSize = 96 // pixels
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QROffsetX = 8
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QROffsetY = 12
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TextOffsetX = 112
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BaseURL = "http://mac-mini.mg:8080/hw/"
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)
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// hwIDPattern validates the HW-XXXXX format (T-04-07 mitigation).
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var hwIDPattern = regexp.MustCompile(`^HW-\d{5}$`)
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// LabelData holds the fields needed to render a standard item label.
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type LabelData struct {
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HWID string // e.g. "HW-00001"
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Name string // item name from NetBox
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SpecLine string // key spec summary, e.g. "Intel NUC i5 2019"
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}
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// RenderStandard produces a 384x120 label bitmap (black on white) for a standard item.
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// Layout: QR code left (96x96 at x=8,y=12), text right (HW ID bold top, name middle, spec bottom).
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// Returns an error if HWID does not match HW-\d{5} (T-04-07 mitigation).
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func RenderStandard(d LabelData) (image.Image, error) {
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if !hwIDPattern.MatchString(d.HWID) {
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return nil, fmt.Errorf("labels: invalid HWID %q: must match HW-NNNNN", d.HWID)
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}
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if d.Name == "" {
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d.Name = "Unknown Item"
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}
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img := image.NewNRGBA(image.Rect(0, 0, LabelWidth, LabelHeight))
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// Fill white background
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draw.Draw(img, img.Bounds(), image.NewUniform(color.NRGBA{R: 255, G: 255, B: 255, A: 255}), image.Point{}, draw.Src)
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// QR code
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qr, err := qrcode.New(BaseURL+d.HWID, qrcode.Low)
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if err != nil {
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return nil, fmt.Errorf("labels: QR generation failed: %w", err)
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}
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qr.DisableBorder = true
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qrImg := qr.Image(QRSize)
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qrDst := image.Rect(QROffsetX, QROffsetY, QROffsetX+QRSize, QROffsetY+QRSize)
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draw.Draw(img, qrDst, qrImg, image.Point{}, draw.Over)
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// Text: HW ID (y=26), Name (y=60), SpecLine (y=92)
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drawText(img, TextOffsetX, 26, d.HWID)
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drawText(img, TextOffsetX, 60, truncate(d.Name, 30))
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drawText(img, TextOffsetX, 92, truncate(d.SpecLine, 30))
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return img, nil
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}
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// drawText renders text onto a draw.Image at (x, y) using basicfont.Face7x13.
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func drawText(img draw.Image, x, y int, text string) {
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d := &font.Drawer{
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Dst: img,
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Src: image.NewUniform(color.Black),
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Face: basicfont.Face7x13,
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Dot: fixed.Point26_6{X: fixed.I(x), Y: fixed.I(y)},
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}
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d.DrawString(text)
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}
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// truncate caps s at max runes, appending "…" if truncated.
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func truncate(s string, max int) string {
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runes := []rune(s)
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if len(runes) <= max {
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return s
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}
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return string(runes[:max-1]) + "…"
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}
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