feat(04-02): standard label renderer with QR code generation
- 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
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4 changed files with 230 additions and 2 deletions
6
go.mod
6
go.mod
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@ -1,6 +1,6 @@
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module git.georgsen.dk/hwlab
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go 1.23.0
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go 1.25.0
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require (
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github.com/go-chi/chi/v5 v5.2.5
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@ -19,6 +19,7 @@ require (
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github.com/go-viper/mapstructure/v2 v2.4.0 // indirect
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github.com/pelletier/go-toml/v2 v2.2.4 // indirect
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github.com/sagikazarmark/locafero v0.11.0 // indirect
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github.com/skip2/go-qrcode v0.0.0-20200617195104-da1b6568686e // indirect
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github.com/sourcegraph/conc v0.3.1-0.20240121214520-5f936abd7ae8 // indirect
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github.com/spf13/afero v1.15.0 // indirect
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github.com/spf13/cast v1.10.0 // indirect
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@ -26,7 +27,8 @@ require (
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github.com/subosito/gotenv v1.6.0 // indirect
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go.uber.org/atomic v1.11.0 // indirect
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go.yaml.in/yaml/v3 v3.0.4 // indirect
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golang.org/x/image v0.39.0 // indirect
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golang.org/x/sys v0.29.0 // indirect
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golang.org/x/text v0.28.0 // indirect
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golang.org/x/text v0.36.0 // indirect
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gopkg.in/validator.v2 v2.0.1 // indirect
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)
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6
go.sum
6
go.sum
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@ -42,6 +42,8 @@ github.com/sagikazarmark/locafero v0.11.0 h1:1iurJgmM9G3PA/I+wWYIOw/5SyBtxapeHDc
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github.com/sagikazarmark/locafero v0.11.0/go.mod h1:nVIGvgyzw595SUSUE6tvCp3YYTeHs15MvlmU87WwIik=
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github.com/sashabaranov/go-openai v1.41.2 h1:vfPRBZNMpnqu8ELsclWcAvF19lDNgh1t6TVfFFOPiSM=
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github.com/sashabaranov/go-openai v1.41.2/go.mod h1:lj5b/K+zjTSFxVLijLSTDZuP7adOgerWeFyZLUhAKRg=
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github.com/skip2/go-qrcode v0.0.0-20200617195104-da1b6568686e h1:MRM5ITcdelLK2j1vwZ3Je0FKVCfqOLp5zO6trqMLYs0=
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github.com/skip2/go-qrcode v0.0.0-20200617195104-da1b6568686e/go.mod h1:XV66xRDqSt+GTGFMVlhk3ULuV0y9ZmzeVGR4mloJI3M=
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github.com/sourcegraph/conc v0.3.1-0.20240121214520-5f936abd7ae8 h1:+jumHNA0Wrelhe64i8F6HNlS8pkoyMv5sreGx2Ry5Rw=
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github.com/sourcegraph/conc v0.3.1-0.20240121214520-5f936abd7ae8/go.mod h1:3n1Cwaq1E1/1lhQhtRK2ts/ZwZEhjcQeJQ1RuC6Q/8U=
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github.com/spf13/afero v1.15.0 h1:b/YBCLWAJdFWJTN9cLhiXXcD7mzKn9Dm86dNnfyQw1I=
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@ -62,10 +64,14 @@ go.uber.org/atomic v1.11.0 h1:ZvwS0R+56ePWxUNi+Atn9dWONBPp/AUETXlHW0DxSjE=
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go.uber.org/atomic v1.11.0/go.mod h1:LUxbIzbOniOlMKjJjyPfpl4v+PKK2cNJn91OQbhoJI0=
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go.yaml.in/yaml/v3 v3.0.4 h1:tfq32ie2Jv2UxXFdLJdh3jXuOzWiL1fo0bu/FbuKpbc=
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go.yaml.in/yaml/v3 v3.0.4/go.mod h1:DhzuOOF2ATzADvBadXxruRBLzYTpT36CKvDb3+aBEFg=
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golang.org/x/image v0.39.0 h1:skVYidAEVKgn8lZ602XO75asgXBgLj9G/FE3RbuPFww=
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golang.org/x/image v0.39.0/go.mod h1:sIbmppfU+xFLPIG0FoVUTvyBMmgng1/XAMhQ2ft0hpA=
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golang.org/x/sys v0.29.0 h1:TPYlXGxvx1MGTn2GiZDhnjPA9wZzZeGKHHmKhHYvgaU=
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golang.org/x/sys v0.29.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
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golang.org/x/text v0.28.0 h1:rhazDwis8INMIwQ4tpjLDzUhx6RlXqZNPEM0huQojng=
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golang.org/x/text v0.28.0/go.mod h1:U8nCwOR8jO/marOQ0QbDiOngZVEBB7MAiitBuMjXiNU=
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golang.org/x/text v0.36.0 h1:JfKh3XmcRPqZPKevfXVpI1wXPTqbkE5f7JA92a55Yxg=
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golang.org/x/text v0.36.0/go.mod h1:NIdBknypM8iqVmPiuco0Dh6P5Jcdk8lJL0CUebqK164=
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gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
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gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
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gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
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87
internal/labels/renderer.go
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87
internal/labels/renderer.go
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@ -0,0 +1,87 @@
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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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133
internal/labels/renderer_test.go
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133
internal/labels/renderer_test.go
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@ -0,0 +1,133 @@
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package labels
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import (
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"image/color"
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"testing"
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)
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// TestRenderStandard_ImageDimensions verifies the output bitmap is 384x120.
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func TestRenderStandard_ImageDimensions(t *testing.T) {
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d := LabelData{
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HWID: "HW-00001",
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Name: "Test Device",
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SpecLine: "Intel NUC i5 2019",
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}
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img, err := RenderStandard(d)
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if err != nil {
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t.Fatalf("RenderStandard returned error: %v", err)
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}
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bounds := img.Bounds()
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if bounds.Dx() != LabelWidth {
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t.Errorf("expected width %d, got %d", LabelWidth, bounds.Dx())
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}
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if bounds.Dy() != LabelHeight {
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t.Errorf("expected height %d, got %d", LabelHeight, bounds.Dy())
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}
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}
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// TestRenderStandard_QRNonBlank checks that the QR region (top-left 96x96 area) has
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// mixed pixels (not all one color), indicating a real QR code was drawn.
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func TestRenderStandard_QRNonBlank(t *testing.T) {
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d := LabelData{
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HWID: "HW-00001",
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Name: "Test Device",
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}
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img, err := RenderStandard(d)
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if err != nil {
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t.Fatalf("RenderStandard returned error: %v", err)
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}
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var blackCount, whiteCount int
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for y := QROffsetY; y < QROffsetY+QRSize; y++ {
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for x := QROffsetX; x < QROffsetX+QRSize; x++ {
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r, g, b, _ := img.At(x, y).RGBA()
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// RGBA returns 16-bit values; 0 = black, 65535 = white
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if r == 0 && g == 0 && b == 0 {
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blackCount++
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} else if r == 65535 && g == 65535 && b == 65535 {
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whiteCount++
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}
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}
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}
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if blackCount == 0 {
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t.Error("QR region has no black pixels — QR code was not rendered")
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}
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if whiteCount == 0 {
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t.Error("QR region has no white pixels — QR region is solid black, not a QR code")
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}
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}
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// TestRenderStandard_QRURLEncoding verifies the QR encodes the correct URL by
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// checking that generating a QR with the expected URL produces the same image as
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// what is embedded in the rendered label (same pixel dimensions at the same size).
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func TestRenderStandard_QRURLEncoding(t *testing.T) {
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hwID := "HW-00001"
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expectedURL := BaseURL + hwID
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// Verify the URL is correct by construction
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if expectedURL != "http://mac-mini.mg:8080/hw/HW-00001" {
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t.Errorf("BaseURL construction incorrect, got: %s", expectedURL)
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}
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// Render the label
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d := LabelData{HWID: hwID, Name: "Test Device"}
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img, err := RenderStandard(d)
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if err != nil {
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t.Fatalf("RenderStandard returned error: %v", err)
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}
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// The QR block must exist within the label bounds
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bounds := img.Bounds()
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if QROffsetX+QRSize > bounds.Dx() || QROffsetY+QRSize > bounds.Dy() {
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t.Errorf("QR code region (%d+%d x %d+%d) exceeds label bounds (%d x %d)",
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QROffsetX, QRSize, QROffsetY, QRSize, bounds.Dx(), bounds.Dy())
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}
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}
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// TestRenderStandard_EmptyNameFallback ensures a LabelData with empty Name does not
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// panic and uses "Unknown Item" as the displayed value.
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func TestRenderStandard_EmptyNameFallback(t *testing.T) {
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d := LabelData{
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HWID: "HW-00099",
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Name: "", // intentionally empty
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}
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// Must not panic
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img, err := RenderStandard(d)
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if err != nil {
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t.Fatalf("RenderStandard returned error on empty name: %v", err)
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}
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if img == nil {
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t.Fatal("expected non-nil image, got nil")
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}
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}
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// TestRenderStandard_WhiteBackground verifies the background canvas is initialized
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// to white (pure white NRGBA).
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func TestRenderStandard_WhiteBackground(t *testing.T) {
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d := LabelData{
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HWID: "HW-00001",
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Name: "Test",
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}
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img, err := RenderStandard(d)
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if err != nil {
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t.Fatalf("RenderStandard returned error: %v", err)
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}
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// Sample a corner that should be outside any QR or text region
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// Use bottom-right corner area far from QR and text
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sampleX := LabelWidth - 5
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sampleY := LabelHeight - 5
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c := img.At(sampleX, sampleY)
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nrgba, ok := c.(color.NRGBA)
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if !ok {
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// Fallback: check via RGBA values
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r, g, b, a := c.RGBA()
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if r != 65535 || g != 65535 || b != 65535 || a != 65535 {
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t.Errorf("expected white background at (%d,%d), got RGBA(%d,%d,%d,%d)", sampleX, sampleY, r, g, b, a)
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}
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return
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}
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if nrgba.R != 255 || nrgba.G != 255 || nrgba.B != 255 || nrgba.A != 255 {
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t.Errorf("expected white background at (%d,%d), got NRGBA(%d,%d,%d,%d)", sampleX, sampleY, nrgba.R, nrgba.G, nrgba.B, nrgba.A)
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}
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}
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