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// Copyright 2024 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package webtheme
import (
"regexp"
"sort"
"strings"
"sync"
"code.gitea.io/gitea/modules/container"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/public"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/util"
)
var (
availableThemes []*ThemeMetaInfo
availableThemeInternalNames container.Set[string]
themeOnce sync.Once
)
const (
fileNamePrefix = "theme-"
fileNameSuffix = ".css"
)
type ThemeMetaInfo struct {
FileName string
InternalName string
DisplayName string
}
func parseThemeMetaInfoToMap(cssContent string) map[string]string {
/*
The theme meta info is stored in the CSS file's variables of `gitea-theme-meta-info` element,
which is a privately defined and is only used by backend to extract the meta info.
Not using ":root" because it is difficult to parse various ":root" blocks when importing other files,
it is difficult to control the overriding, and it's difficult to avoid user's customized overridden styles.
*/
metaInfoContent := cssContent
if pos := strings.LastIndex(metaInfoContent, "gitea-theme-meta-info"); pos >= 0 {
metaInfoContent = metaInfoContent[pos:]
}
reMetaInfoItem := `
(
\s*(--[-\w]+)
\s*:
\s*(
("(\\"|[^"])*")
|('(\\'|[^'])*')
|([^'";]+)
)
\s*;
\s*
)
`
reMetaInfoItem = strings.ReplaceAll(reMetaInfoItem, "\n", "")
reMetaInfoBlock := `\bgitea-theme-meta-info\s*\{(` + reMetaInfoItem + `+)\}`
re := regexp.MustCompile(reMetaInfoBlock)
matchedMetaInfoBlock := re.FindAllStringSubmatch(metaInfoContent, -1)
if len(matchedMetaInfoBlock) == 0 {
return nil
}
re = regexp.MustCompile(strings.ReplaceAll(reMetaInfoItem, "\n", ""))
matchedItems := re.FindAllStringSubmatch(matchedMetaInfoBlock[0][1], -1)
m := map[string]string{}
for _, item := range matchedItems {
v := item[3]
if strings.HasPrefix(v, `"`) {
v = strings.TrimSuffix(strings.TrimPrefix(v, `"`), `"`)
v = strings.ReplaceAll(v, `\"`, `"`)
} else if strings.HasPrefix(v, `'`) {
v = strings.TrimSuffix(strings.TrimPrefix(v, `'`), `'`)
v = strings.ReplaceAll(v, `\'`, `'`)
}
m[item[2]] = v
}
return m
}
func defaultThemeMetaInfoByFileName(fileName string) *ThemeMetaInfo {
themeInfo := &ThemeMetaInfo{
FileName: fileName,
InternalName: strings.TrimSuffix(strings.TrimPrefix(fileName, fileNamePrefix), fileNameSuffix),
}
themeInfo.DisplayName = themeInfo.InternalName
return themeInfo
}
func defaultThemeMetaInfoByInternalName(fileName string) *ThemeMetaInfo {
return defaultThemeMetaInfoByFileName(fileNamePrefix + fileName + fileNameSuffix)
}
func parseThemeMetaInfo(fileName, cssContent string) *ThemeMetaInfo {
themeInfo := defaultThemeMetaInfoByFileName(fileName)
m := parseThemeMetaInfoToMap(cssContent)
if m == nil {
return themeInfo
}
themeInfo.DisplayName = m["--theme-display-name"]
return themeInfo
}
func initThemes() {
availableThemes = nil
defer func() {
availableThemeInternalNames = container.Set[string]{}
for _, theme := range availableThemes {
availableThemeInternalNames.Add(theme.InternalName)
}
if !availableThemeInternalNames.Contains(setting.UI.DefaultTheme) {
setting.LogStartupProblem(1, log.ERROR, "Default theme %q is not available, please correct the '[ui].DEFAULT_THEME' setting in the config file", setting.UI.DefaultTheme)
}
}()
cssFiles, err := public.AssetFS().ListFiles("/assets/css")
if err != nil {
log.Error("Failed to list themes: %v", err)
availableThemes = []*ThemeMetaInfo{defaultThemeMetaInfoByInternalName(setting.UI.DefaultTheme)}
return
}
var foundThemes []*ThemeMetaInfo
for _, fileName := range cssFiles {
if strings.HasPrefix(fileName, fileNamePrefix) && strings.HasSuffix(fileName, fileNameSuffix) {
content, err := public.AssetFS().ReadFile("/assets/css/" + fileName)
if err != nil {
log.Error("Failed to read theme file %q: %v", fileName, err)
continue
}
foundThemes = append(foundThemes, parseThemeMetaInfo(fileName, util.UnsafeBytesToString(content)))
}
}
if len(setting.UI.Themes) > 0 {
allowedThemes := container.SetOf(setting.UI.Themes...)
for _, theme := range foundThemes {
if allowedThemes.Contains(theme.InternalName) {
availableThemes = append(availableThemes, theme)
}
}
} else {
availableThemes = foundThemes
}
sort.Slice(availableThemes, func(i, j int) bool {
if availableThemes[i].InternalName == setting.UI.DefaultTheme {
return true
}
return availableThemes[i].DisplayName < availableThemes[j].DisplayName
})
if len(availableThemes) == 0 {
setting.LogStartupProblem(1, log.ERROR, "No theme candidate in asset files, but Gitea requires there should be at least one usable theme")
availableThemes = []*ThemeMetaInfo{defaultThemeMetaInfoByInternalName(setting.UI.DefaultTheme)}
}
}
func GetAvailableThemes() []*ThemeMetaInfo {
themeOnce.Do(initThemes)
return availableThemes
}
func IsThemeAvailable(internalName string) bool {
themeOnce.Do(initThemes)
return availableThemeInternalNames.Contains(internalName)
}
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