feat(middleware): add themed middleware with customizable themes and styles

- Introduced a new themed middleware that allows for dynamic theme application.
- Added support for multiple themes: dark, dark-grey, solarized-dark, and custom CSS.
- Included CSS files for each theme and a font CSS template for font customization.
- Updated middleware registry to include the new themed middleware.
This commit is contained in:
yusing 2025-07-20 12:59:25 +08:00
parent 46c7ee4d84
commit e02cacdf2a
6 changed files with 499 additions and 0 deletions

View file

@ -25,6 +25,7 @@ var allMiddlewares = map[string]*Middleware{
"hidexforwarded": HideXForwarded, "hidexforwarded": HideXForwarded,
"modifyhtml": ModifyHTML, "modifyhtml": ModifyHTML,
"themed": Themed,
"errorpage": CustomErrorPage, "errorpage": CustomErrorPage,
"customerrorpage": CustomErrorPage, "customerrorpage": CustomErrorPage,

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@ -0,0 +1,113 @@
package middleware
import (
"bytes"
"fmt"
"net/http"
"os"
"strings"
"text/template"
_ "embed"
"github.com/yusing/go-proxy/internal/gperr"
)
type themed struct {
FontURL string `json:"font_url"`
FontFamily string `json:"font_family"`
Theme Theme `json:"theme"` // predefined themes
CSS string `json:"css"` // css url or content
m modifyHTML
}
var Themed = NewMiddleware[themed]()
type Theme string
const (
DarkTheme Theme = "dark"
DarkGreyTheme Theme = "dark-grey"
SolarizedDarkTheme Theme = "solarized-dark"
)
var (
//go:embed themes/dark.css
darkModeCSS string
//go:embed themes/dark-grey.css
darkGreyModeCSS string
//go:embed themes/solarized-dark.css
solarizedDarkModeCSS string
//go:embed themes/font.css
fontCSS string
)
var fontCSSTemplate = template.Must(template.New("fontCSS").Parse(fontCSS))
const overAllocate = 256
func (m *themed) before(w http.ResponseWriter, req *http.Request) bool {
return m.m.before(w, req)
}
func (m *themed) modifyResponse(resp *http.Response) error {
return m.m.modifyResponse(resp)
}
func (m *themed) finalize() error {
m.m.Target = "body"
if m.FontURL != "" && m.FontFamily != "" {
buf := bytes.NewBuffer(bytePool.GetSized(len(fontCSS) + overAllocate))
buf.WriteString(`<style type="text/css">`)
defer bytePool.Put(buf.Bytes())
err := fontCSSTemplate.Execute(buf, m)
if err != nil {
return err
}
buf.WriteString("</style>")
m.m.HTML += buf.String()
}
if m.CSS != "" && m.Theme != "" {
return gperr.New("css and theme are mutually exclusive")
}
// credit: https://hackcss.egoist.dev
if m.Theme != "" {
switch m.Theme {
case DarkTheme:
m.m.HTML += wrapStyleTag(darkModeCSS)
case DarkGreyTheme:
m.m.HTML += wrapStyleTag(darkGreyModeCSS)
case SolarizedDarkTheme:
m.m.HTML += wrapStyleTag(solarizedDarkModeCSS)
default:
return gperr.New("invalid theme").Subject(string(m.Theme))
}
}
if m.CSS != "" {
switch {
case strings.HasPrefix(m.CSS, "https://"),
strings.HasPrefix(m.CSS, "http://"),
strings.HasPrefix(m.CSS, "/"):
m.m.HTML += wrapStylesheetLinkTag(m.CSS)
case strings.HasPrefix(m.CSS, "file://"):
css, err := os.ReadFile(strings.TrimPrefix(m.CSS, "file://"))
if err != nil {
return err
}
m.m.HTML += wrapStyleTag(string(css))
default:
// inline css
m.m.HTML += wrapStyleTag(m.CSS)
}
}
return nil
}
func wrapStyleTag(css string) string {
return fmt.Sprintf(`<style type="text/css">%s</style>`, css)
}
func wrapStylesheetLinkTag(href string) string {
return fmt.Sprintf(`<link rel="stylesheet" href=%q>`, href)
}

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@ -0,0 +1,116 @@
:not(img, svg) {
background-color: #181818 !important;
color: #ccc !important;
}
pre {
background-color: #181818 !important;
padding: 0 !important;
border: none !important;
}
pre code {
color: #00bcd4 !important;
}
h1 a,
h2 a,
h3 a,
h4 a,
h5 a {
color: #ccc !important;
}
code,
strong {
color: #fff !important;
}
code {
font-weight: 100;
}
table {
color: #ccc !important;
}
table td,
table th {
border-color: #444 !important;
}
table tbody td:first-child {
color: #fff !important;
}
.form-group label {
color: #ccc !important;
border-color: rgba(95, 95, 95, 0.78) !important;
}
.form-group.form-textarea label:after {
background-color: #181818 !important;
}
.form-control {
color: #ccc !important;
border-color: rgba(95, 95, 95, 0.78) !important;
}
.form-control:focus {
border-color: #ccc !important;
color: #ccc !important;
}
textarea.form-control {
color: #ccc !important;
}
.card {
border-color: rgba(95, 95, 95, 0.78) !important;
}
.card .card-header {
background-color: transparent !important;
color: #ccc !important;
border-bottom: 1px solid rgba(95, 95, 95, 0.78) !important;
}
.btn.btn-ghost.btn-default {
border-color: #ababab !important;
color: #ababab !important;
}
.btn.btn-ghost.btn-default:focus,
.btn.btn-ghost.btn-default:hover {
border-color: #9c9c9c !important;
color: #9c9c9c !important;
z-index: 1;
}
.btn.btn-ghost.btn-default:focus,
.btn.btn-ghost.btn-default:hover {
border-color: #e0e0e0 !important;
color: #e0e0e0 !important;
}
.btn.btn-ghost.btn-primary:focus,
.btn.btn-ghost.btn-primary:hover {
border-color: #64b5f6 !important;
color: #64b5f6 !important;
}
.btn.btn-ghost.btn-success:focus,
.btn.btn-ghost.btn-success:hover {
border-color: #81c784 !important;
color: #81c784 !important;
}
.btn.btn-ghost.btn-info:focus,
.btn.btn-ghost.btn-info:hover {
border-color: #4dd0e1 !important;
color: #4dd0e1 !important;
}
.btn.btn-ghost.btn-error:focus,
.btn.btn-ghost.btn-error:hover {
border-color: #e57373 !important;
color: #e57373 !important;
}
.btn.btn-ghost.btn-warning:focus,
.btn.btn-ghost.btn-warning:hover {
border-color: #ffb74d !important;
color: #ffb74d !important;
}
.avatarholder,
.placeholder {
background-color: transparent !important;
border-color: #333 !important;
}
.menu .menu-item {
color: #ccc !important;
border-color: rgba(95, 95, 95, 0.78) !important;
}
.menu .menu-item.active,
.menu .menu-item:hover {
color: #fff !important;
border-color: #ccc !important;
}

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@ -0,0 +1,116 @@
:not(img, svg) {
background-color: #000 !important;
color: #ccc !important;
}
pre {
background-color: #000 !important;
padding: 0;
border: none;
}
pre code {
color: #00bcd4 !important;
}
h1 a,
h2 a,
h3 a,
h4 a,
h5 a {
color: #ccc !important;
}
code,
strong {
color: #fff !important;
}
code {
font-weight: 100;
}
table {
color: #ccc !important;
}
table td,
table th {
border-color: #444 !important;
}
table tbody td:first-child {
color: #fff !important;
}
.form-group label {
color: #ccc !important;
border-color: rgba(95, 95, 95, 0.78) !important;
}
.form-group.form-textarea label:after {
background-color: #000 !important;
}
.form-control {
color: #ccc !important;
border-color: rgba(95, 95, 95, 0.78) !important;
}
.form-control:focus {
border-color: #ccc !important;
color: #ccc !important;
}
textarea.form-control {
color: #ccc !important;
}
.card {
border-color: rgba(95, 95, 95, 0.78) !important;
}
.card .card-header {
background-color: transparent !important;
color: #ccc !important;
border-bottom: 1px solid rgba(95, 95, 95, 0.78) !important;
}
.btn.btn-ghost.btn-default {
border-color: #ababab !important;
color: #ababab !important;
}
.btn.btn-ghost.btn-default:focus,
.btn.btn-ghost.btn-default:hover {
border-color: #9c9c9c !important;
color: #9c9c9c !important;
z-index: 1;
}
.btn.btn-ghost.btn-default:focus,
.btn.btn-ghost.btn-default:hover {
border-color: #e0e0e0 !important;
color: #e0e0e0 !important;
}
.btn.btn-ghost.btn-primary:focus,
.btn.btn-ghost.btn-primary:hover {
border-color: #64b5f6 !important;
color: #64b5f6 !important;
}
.btn.btn-ghost.btn-success:focus,
.btn.btn-ghost.btn-success:hover {
border-color: #81c784 !important;
color: #81c784 !important;
}
.btn.btn-ghost.btn-info:focus,
.btn.btn-ghost.btn-info:hover {
border-color: #4dd0e1 !important;
color: #4dd0e1 !important;
}
.btn.btn-ghost.btn-error:focus,
.btn.btn-ghost.btn-error:hover {
border-color: #e57373 !important;
color: #e57373 !important;
}
.btn.btn-ghost.btn-warning:focus,
.btn.btn-ghost.btn-warning:hover {
border-color: #ffb74d !important;
color: #ffb74d !important;
}
.avatarholder,
.placeholder {
background-color: transparent !important;
border-color: #333 !important;
}
.menu .menu-item {
color: #ccc !important;
border-color: rgba(95, 95, 95, 0.78) !important;
}
.menu .menu-item.active,
.menu .menu-item:hover {
color: #fff !important;
border-color: #ccc !important;
}

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@ -0,0 +1,4 @@
@import url("{{.FontURL}}");
body {
font-family: "{{.FontFamily}}", "arial", "roboto" !important;
}

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@ -0,0 +1,149 @@
:not(img, svg) {
background-color: #073642 !important;
color: #78909c !important;
}
pre {
background-color: #073642 !important;
padding: 0;
border: none;
}
pre code {
color: #009688 !important;
}
h1,
h2,
h3,
h4,
h5,
h6 {
color: #1e88e5 !important;
}
h1 a,
h2 a,
h3 a,
h4 a,
h5 a,
h6 a {
color: #1e88e5 !important;
border-bottom-color: #1e88e5 !important;
}
h1 a:hover,
h2 a:hover,
h3 a:hover,
h4 a:hover,
h5 a:hover,
h6 a:hover {
background-color: #1e88e5 !important;
color: #fff !important;
}
h1 a,
h2 a,
h3 a,
h4 a,
h5 a {
color: #78909c !important;
}
code,
strong {
color: #90a4ae !important;
}
code {
font-weight: 100;
}
.progress-bar-filled {
background-color: #558b2f !important;
}
.progress-bar-filled:after,
.progress-bar-filled:before {
color: #90a4ae !important;
}
table {
color: #78909c !important;
}
table td,
table th {
border-color: #b0bec5 !important;
}
table tbody td:first-child {
color: #b0bec5 !important;
}
.form-group label {
color: #78909c !important;
border-color: #90a4ae !important;
}
.form-group.form-textarea label:after {
background-color: #073642 !important;
}
.form-control {
color: #78909c !important;
border-color: #90a4ae !important;
}
.form-control:focus {
border-color: #cfd8dc !important;
color: #cfd8dc !important;
}
textarea.form-control {
color: #78909c !important;
}
.card {
border-color: #90a4ae !important;
}
.card .card-header {
background-color: transparent !important;
color: #78909c !important;
border-bottom: 1px solid #90a4ae !important;
}
.btn.btn-ghost.btn-default {
border-color: #607d8b !important;
color: #607d8b !important;
}
.btn.btn-ghost.btn-default:focus,
.btn.btn-ghost.btn-default:hover {
border-color: #90a4ae !important;
color: #90a4ae !important;
z-index: 1;
}
.btn.btn-ghost.btn-default:focus,
.btn.btn-ghost.btn-default:hover {
border-color: #e0e0e0 !important;
color: #e0e0e0 !important;
}
.btn.btn-ghost.btn-primary:focus,
.btn.btn-ghost.btn-primary:hover {
border-color: #64b5f6 !important;
color: #64b5f6 !important;
}
.btn.btn-ghost.btn-success:focus,
.btn.btn-ghost.btn-success:hover {
border-color: #81c784 !important;
color: #81c784 !important;
}
.btn.btn-ghost.btn-info:focus,
.btn.btn-ghost.btn-info:hover {
border-color: #4dd0e1 !important;
color: #4dd0e1 !important;
}
.btn.btn-ghost.btn-error:focus,
.btn.btn-ghost.btn-error:hover {
border-color: #e57373 !important;
color: #e57373 !important;
}
.btn.btn-ghost.btn-warning:focus,
.btn.btn-ghost.btn-warning:hover {
border-color: #ffb74d !important;
color: #ffb74d !important;
}
.avatarholder,
.placeholder {
background-color: transparent !important;
border-color: #90a4ae !important;
}
.menu .menu-item {
color: #78909c !important;
border-color: #90a4ae !important;
}
.menu .menu-item.active,
.menu .menu-item:hover {
color: #fff !important;
border-color: #78909c !important;
}