129 lines
2.8 KiB
Go
129 lines
2.8 KiB
Go
package keyproofs
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import (
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"context"
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"crypto/md5"
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"fmt"
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"net"
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"strings"
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"github.com/lucasb-eyer/go-colorful"
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"github.com/rs/zerolog/log"
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)
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type StyleKey string
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func (s StyleKey) Key() interface{} {
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return s
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}
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type Style struct {
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Avatar,
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Cover,
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Background string
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Palette []string
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}
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func getStyle(ctx context.Context, email string) (*Style, error) {
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log := log.Ctx(ctx)
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avatarHost, styleHost, err := styleSRV(ctx, email)
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if err != nil {
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return nil, err
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}
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log.Info().Str("avatar", avatarHost).Str("style", styleHost).Msg("getStyle")
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hash := md5.New()
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email = strings.TrimSpace(strings.ToLower(email))
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_, _ = hash.Write([]byte(email))
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id := hash.Sum(nil)
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style := &Style{}
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style.Palette = getPalette(fmt.Sprintf("#%x", id[:3]))
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style.Avatar = fmt.Sprintf("https://%s/avatar/%x", avatarHost, id)
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style.Cover = pixl
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style.Background = "https://lavana.sour.is/bg/52548b3dcb032882675afe1e4bcba0e9"
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if styleHost != "" {
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style.Cover = fmt.Sprintf("https://%s/cover/%x", styleHost, id)
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style.Background = fmt.Sprintf("https://%s/bg/%x", styleHost, id)
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}
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return style, err
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}
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func styleSRV(ctx context.Context, email string) (avatar string, style string, err error) {
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// Defaults
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style = ""
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avatar = "www.gravatar.com"
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parts := strings.SplitN(email, "@", 2)
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if _, srv, err := net.DefaultResolver.LookupSRV(ctx, "style-sec", "tcp", parts[1]); err == nil {
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if len(srv) > 0 {
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style = strings.TrimSuffix(srv[0].Target, ".")
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avatar = strings.TrimSuffix(srv[0].Target, ".")
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return avatar, style, err
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}
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}
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if _, srv, err := net.DefaultResolver.LookupSRV(ctx, "avatars-sec", "tcp", parts[1]); err == nil {
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if len(srv) > 0 {
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avatar = strings.TrimSuffix(srv[0].Target, ".")
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return avatar, style, err
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}
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}
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return
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}
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// getPalette maes a complementary color palette. https://play.golang.org/p/nBXLUocGsU5
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func getPalette(hex string) []string {
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reference, _ := colorful.Hex(hex)
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reference = sat(lum(reference, 0, .5), 0, .5)
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white := colorful.Color{R: 1, G: 1, B: 1}
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black := colorful.Color{R: 0, G: 0, B: 0}
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accentA := hue(reference, 60)
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accentB := hue(reference, -60)
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accentC := hue(reference, -180)
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return append(
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[]string{},
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white.Hex(),
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lum(reference, .4, .6).Hex(),
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reference.Hex(),
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lum(reference, .4, 0).Hex(),
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black.Hex(),
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lum(accentA, .4, .6).Hex(),
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accentA.Hex(),
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lum(accentA, .4, 0).Hex(),
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lum(accentB, .4, .6).Hex(),
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accentB.Hex(),
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lum(accentB, .4, 0).Hex(),
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lum(accentC, .4, .6).Hex(),
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accentC.Hex(),
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lum(accentC, .4, 0).Hex(),
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)
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}
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func hue(in colorful.Color, H float64) colorful.Color {
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h, s, l := in.Hsl()
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return colorful.Hsl(h+H, s, l)
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}
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func sat(in colorful.Color, S, V float64) colorful.Color {
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h, s, l := in.Hsl()
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return colorful.Hsl(h, V+s*S, l)
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}
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func lum(in colorful.Color, L, V float64) colorful.Color {
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h, s, l := in.Hsl()
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return colorful.Hsl(h, s, V+l*L)
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}
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