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package httpd
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import (
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_ "embed"
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"image"
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"image/color"
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"image/draw"
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"image/png"
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"net/http"
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"strconv"
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"strings"
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"sync"
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"github.com/barerepo/server/internal/gitx"
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"github.com/barerepo/server/internal/transport"
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"golang.org/x/image/font"
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"golang.org/x/image/font/opentype"
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"golang.org/x/image/math/fixed"
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//go:embed static/fonts/SpaceMono-Regular.ttf
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var cardRegular []byte
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//go:embed static/fonts/SpaceMono-Bold.ttf
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var cardBold []byte
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const (
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cardW, cardH = 1200, 630
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cardInset = 48
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cardLeft = 104
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var (
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cardOnce sync.Once
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cardFaces map[int]font.Face
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cardFaceErr error
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func cardFace(size int, bold bool) font.Face {
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cardOnce.Do(func() {
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cardFaces = map[int]font.Face{}
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for _, spec := range []struct {
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key int
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size float64
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data []byte
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}{
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{112, 112, cardBold}, {76, 76, cardBold}, {26, 26, cardRegular}, {28, 28, cardRegular},
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} {
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f, err := opentype.Parse(spec.data)
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if err != nil {
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cardFaceErr = err
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return
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face, err := opentype.NewFace(f, &opentype.FaceOptions{Size: spec.size, DPI: 72, Hinting: font.HintingFull})
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if err != nil {
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cardFaceErr = err
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return
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cardFaces[spec.key] = face
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})
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return cardFaces[size]
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// cardText draws one line and reports where the next one starts.
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func cardText(dst *image.RGBA, x, y, size int, s string, c color.Color) {
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face := cardFace(size, false)
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if face == nil {
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return
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d := font.Drawer{Dst: dst, Src: image.NewUniform(c), Face: face,
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Dot: fixed.P(x, y)}
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d.DrawString(s)
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// cardFits shortens a line that would run past the frame, because a card cannot scroll.
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func cardFits(s string, size, width int) string {
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face := cardFace(size, false)
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if face == nil {
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return s
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if font.MeasureString(face, s).Ceil() <= width {
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return s
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for len(s) > 1 {
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s = s[:len(s)-1]
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if font.MeasureString(face, s+"...").Ceil() <= width {
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return s + "..."
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return s
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// drawCard is the share image for one page, in the same ink as the pages themselves.
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func drawCard(title, subtitle, foot string) (*image.RGBA, error) {
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if cardFace(112, true); cardFaceErr != nil {
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return nil, cardFaceErr
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img := image.NewRGBA(image.Rect(0, 0, cardW, cardH))
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draw.Draw(img, img.Bounds(), image.NewUniform(color.White), image.Point{}, draw.Src)
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border := color.RGBA{0xdd, 0xdd, 0xdd, 0xff}
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frame := image.Rect(cardInset, cardInset, cardW-cardInset, cardH-cardInset)
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for x := frame.Min.X; x < frame.Max.X; x++ {
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img.Set(x, frame.Min.Y, border)
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img.Set(x, frame.Min.Y+1, border)
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img.Set(x, frame.Max.Y-1, border)
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img.Set(x, frame.Max.Y-2, border)
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}
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for y := frame.Min.Y; y < frame.Max.Y; y++ {
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img.Set(frame.Min.X, y, border)
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img.Set(frame.Min.X+1, y, border)
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img.Set(frame.Max.X-1, y, border)
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img.Set(frame.Max.X-2, y, border)
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}
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width := cardW - cardLeft - cardInset - 56
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size := 112
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if len(title) > 12 {
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size = 76
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}
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cardText(img, cardLeft, 232, size, cardFits(title, size, width), color.Black)
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if subtitle != "" {
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cardText(img, cardLeft+2, 296, 28, cardFits(subtitle, 28, width), color.RGBA{0x55, 0x55, 0x55, 0xff})
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}
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for x := cardLeft; x < cardW-cardInset-56; x++ {
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img.Set(x, 360, border)
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img.Set(x, 361, border)
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}
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cardText(img, cardLeft+2, 530, 26, cardFits(foot, 26, width), color.Black)
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return img, nil
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// serveCard draws the share image for a page, so a link to it says whose it is.
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func (s *Server) serveCard(w http.ResponseWriter, r *http.Request, title, subtitle, foot string) {
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img, err := drawCard(title, subtitle, foot)
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if err != nil {
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s.oops(w, r, err)
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return
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}
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w.Header().Set("Content-Type", "image/png")
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w.Header().Set("Cache-Control", "public, max-age=300")
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png.Encode(w, img)
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// cardHost is the domain a card signs itself with, without the scheme.
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func cardHost(site string) string {
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host := strings.TrimPrefix(strings.TrimPrefix(site, "https://"), "http://")
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return strings.TrimSuffix(host, "/")
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// serveNamedCard draws the share image for an account or a repository, and refuses anything else.
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func (s *Server) serveNamedCard(w http.ResponseWriter, r *http.Request, parts []string) {
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foot := cardHost(s.Cfg.Server.ExternalURL)
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switch len(parts) {
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case 1:
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owner := parts[0]
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if !gitx.ValidName(owner) {
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s.notFound(w, r)
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return
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}
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if _, err := s.DB.Account(r.Context(), owner); err != nil {
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s.notFound(w, r)
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return
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}
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// Only what this reader may see, so a card cannot count somebody's private work.
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names, _ := s.DB.ReposOf(r.Context(), owner)
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n := 0
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for _, repo := range names {
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if _, err := s.Transport.Open(r.Context(), owner, repo, s.viewer(r), transport.Read); err == nil {
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n++
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}
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}
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s.serveCard(w, r, owner, plural(n, "repository", "repositories"), foot+"/"+owner)
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case 2:
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owner, name := parts[0], parts[1]
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if !gitx.ValidName(owner) || !gitx.ValidRepoName(name) {
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s.notFound(w, r)
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return
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}
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// A card is public, so it must not say a private repository exists.
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res, err := s.Transport.Open(r.Context(), owner, name, s.viewer(r), transport.Read)
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if err != nil || res == nil {
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s.notFound(w, r)
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return
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}
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// The count, not the description, so the line is the same shape as the profile card's.
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n := 0
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if out, err := gitx.Run(r.Context(), res.Dir, "rev-list", "--count", "HEAD"); err == nil {
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n, _ = strconv.Atoi(strings.TrimSpace(out))
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}
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s.serveCard(w, r, owner+"/"+name, plural(n, "commit", "commits"), foot+"/"+owner+"/"+name)
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default:
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s.notFound(w, r)
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}