lewis.moe
Monorepo for Tangled
appview: serve ico favicons on /favicon.ico
this is recognized by safari. the only size this image is served at is
48x48. the dolly silhouette is used. cache/etag headers are identical to
the svg output.
Signed-off-by: oppiliappan <me@oppi.li>
+3
appview/pages/templates/layouts/base.html
+3
appview/pages/templates/layouts/base.html
···
11
11
<script defer src="/static/htmx-ext-ws.min.js"></script>
12
12
<script defer src="/static/actor-typeahead.js" type="module"></script>
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14
+
<link rel="icon" href="/favicon.ico" sizes="48x48"/>
15
+
<link rel="icon" href="/favicon.svg" sizes="any" type="image/svg+xml"/>
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+
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<!-- preconnect to image cdn -->
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<link rel="preconnect" href="https://avatar.tangled.sh" />
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<link rel="preconnect" href="https://camo.tangled.sh" />
+91
appview/state/favicon.go
+91
appview/state/favicon.go
···
1
+
package state
2
+
3
+
import (
4
+
"bytes"
5
+
"fmt"
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+
"html/template"
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"image"
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"image/color"
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"net/http"
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+
11
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"github.com/srwiley/oksvg"
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"github.com/srwiley/rasterx"
13
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"golang.org/x/image/draw"
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"tangled.org/core/appview/pages"
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"tangled.org/core/ico"
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)
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+
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func (s *State) FaviconSvg(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Content-Type", "image/svg+xml")
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w.Header().Set("Cache-Control", "public, max-age=31536000") // one year
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w.Header().Set("ETag", `"favicon-svg-v1"`)
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+
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if match := r.Header.Get("If-None-Match"); match == `"favicon-svg-v1"` {
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w.WriteHeader(http.StatusNotModified)
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return
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}
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+
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s.pages.Favicon(w)
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}
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+
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func (s *State) FaviconIco(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Content-Type", "image/x-icon")
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w.Header().Set("Cache-Control", "public, max-age=31536000") // one year
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w.Header().Set("ETag", `"favicon-ico-v1"`)
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+
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if match := r.Header.Get("If-None-Match"); match == `"favicon-ico-v1"` {
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w.WriteHeader(http.StatusNotModified)
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return
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+
}
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+
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ico, err := dollyIco()
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if err != nil {
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s.logger.Error("failed to render ico", "err", err)
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w.WriteHeader(http.StatusNotFound)
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return
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+
}
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+
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w.Write(ico)
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}
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+
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+
func dollyIco() ([]byte, error) {
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// first, get the bytes from the svg
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tpl, err := template.New("dolly").
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ParseFS(pages.Files, "templates/fragments/dolly/silhouette.html")
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if err != nil {
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return nil, err
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}
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+
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var svgData bytes.Buffer
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if err := tpl.ExecuteTemplate(&svgData, "fragments/dolly/silhouette", "#000000"); err != nil {
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return nil, err
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+
}
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+
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img, err := svgToImage(svgData.Bytes(), 48, 48)
65
+
if err != nil {
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return nil, err
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}
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+
69
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ico, err := ico.ImageToIco(img)
70
+
if err != nil {
71
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return nil, err
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+
}
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+
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return ico, nil
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+
}
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+
77
+
func svgToImage(svgData []byte, w, h int) (image.Image, error) {
78
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icon, err := oksvg.ReadIconStream(bytes.NewReader(svgData))
79
+
if err != nil {
80
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return nil, fmt.Errorf("error parsing SVG: %v", err)
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}
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+
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icon.SetTarget(0, 0, float64(w), float64(h))
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rgba := image.NewRGBA(image.Rect(0, 0, w, h))
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draw.Draw(rgba, rgba.Bounds(), &image.Uniform{color.Transparent}, image.Point{}, draw.Src)
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scanner := rasterx.NewScannerGV(w, h, rgba, rgba.Bounds())
87
+
raster := rasterx.NewDasher(w, h, scanner)
88
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icon.Draw(raster, 1.0)
89
+
90
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return rgba, nil
91
+
}
+2
-2
appview/state/router.go
+2
-2
appview/state/router.go
···
32
32
s.pages,
33
33
)
34
34
35
-
router.Get("/favicon.svg", s.Favicon)
36
-
router.Get("/favicon.ico", s.Favicon)
35
+
router.Get("/favicon.svg", s.FaviconSvg)
36
+
router.Get("/favicon.ico", s.FaviconIco)
37
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router.Get("/pwa-manifest.json", s.PWAManifest)
38
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router.Get("/robots.txt", s.RobotsTxt)
39
39
-13
appview/state/state.go
-13
appview/state/state.go
···
202
202
return s.db.Close()
203
203
}
204
204
205
-
func (s *State) Favicon(w http.ResponseWriter, r *http.Request) {
206
-
w.Header().Set("Content-Type", "image/svg+xml")
207
-
w.Header().Set("Cache-Control", "public, max-age=31536000") // one year
208
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w.Header().Set("ETag", `"favicon-svg-v1"`)
209
-
210
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if match := r.Header.Get("If-None-Match"); match == `"favicon-svg-v1"` {
211
-
w.WriteHeader(http.StatusNotModified)
212
-
return
213
-
}
214
-
215
-
s.pages.Favicon(w)
216
-
}
217
-
218
205
func (s *State) RobotsTxt(w http.ResponseWriter, r *http.Request) {
219
206
w.Header().Set("Content-Type", "text/plain")
220
207
w.Header().Set("Cache-Control", "public, max-age=86400") // one day