507 lines
15 KiB
Go
507 lines
15 KiB
Go
/* Copyright Azareal 2016 - 2018 */
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package main
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import (
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//"fmt"
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"bytes"
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"encoding/json"
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"errors"
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"io/ioutil"
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"log"
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"mime"
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"net/http"
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"os"
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"path/filepath"
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"reflect"
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"strings"
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"sync"
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"sync/atomic"
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"text/template"
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)
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var themes = make(map[string]Theme)
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var defaultThemeBox atomic.Value
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var changeDefaultThemeMutex sync.Mutex
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// TODO: Use this when the default theme doesn't exist
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var fallbackTheme = "shadow"
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//var overridenTemplates map[string]interface{} = make(map[string]interface{})
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var overridenTemplates = make(map[string]bool)
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type Theme struct {
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Name string
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FriendlyName string
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Version string
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Creator string
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FullImage string
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MobileFriendly bool
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Disabled bool
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HideFromThemes bool
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ForkOf string
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Tag string
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URL string
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Sidebars string // Allowed Values: left, right, both, false
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//DisableMinifier // Is this really a good idea? I don't think themes should be fighting against the minifier
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Settings map[string]ThemeSetting
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Templates []TemplateMapping
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TemplatesMap map[string]string
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TmplPtr map[string]interface{}
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Resources []ThemeResource
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ResourceTemplates *template.Template
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// This variable should only be set and unset by the system, not the theme meta file
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Active bool
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}
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type ThemeSetting struct {
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FriendlyName string
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Options []string
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}
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type TemplateMapping struct {
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Name string
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Source string
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//When string
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}
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type ThemeResource struct {
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Name string
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Location string
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}
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func init() {
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defaultThemeBox.Store(fallbackTheme)
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}
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// ? - Delete themes which no longer exist in the themes folder from the database?
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func LoadThemes() error {
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changeDefaultThemeMutex.Lock()
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rows, err := getThemesStmt.Query()
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if err != nil {
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return err
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}
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defer rows.Close()
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var uname string
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var defaultThemeSwitch bool
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for rows.Next() {
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err = rows.Scan(&uname, &defaultThemeSwitch)
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if err != nil {
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return err
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}
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// Was the theme deleted at some point?
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theme, ok := themes[uname]
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if !ok {
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continue
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}
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if defaultThemeSwitch {
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log.Print("Loading the default theme '" + theme.Name + "'")
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theme.Active = true
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defaultThemeBox.Store(theme.Name)
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mapThemeTemplates(theme)
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} else {
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log.Print("Loading the theme '" + theme.Name + "'")
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theme.Active = false
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}
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themes[uname] = theme
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}
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changeDefaultThemeMutex.Unlock()
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return rows.Err()
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}
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func initThemes() error {
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themeFiles, err := ioutil.ReadDir("./themes")
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if err != nil {
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return err
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}
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for _, themeFile := range themeFiles {
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if !themeFile.IsDir() {
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continue
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}
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themeName := themeFile.Name()
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log.Print("Adding theme '" + themeName + "'")
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themeFile, err := ioutil.ReadFile("./themes/" + themeName + "/theme.json")
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if err != nil {
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return err
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}
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var theme Theme
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err = json.Unmarshal(themeFile, &theme)
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if err != nil {
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return err
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}
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theme.Active = false // Set this to false, just in case someone explicitly overrode this value in the JSON file
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// TODO: Let the theme specify where it's resources are via the JSON file?
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// TODO: Let the theme inherit CSS from another theme?
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// ? - This might not be too helpful, as it only searches for /public/ and not if /public/ is empty. Still, it might help some people with a slightly less cryptic error
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_, err = os.Stat("./themes/" + theme.Name + "/public/")
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if err != nil {
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if os.IsNotExist(err) {
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return errors.New("We couldn't find this theme's resources. E.g. the /public/ folder.")
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} else {
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log.Print("We weren't able to access this theme's resources due to a permissions issue or some other problem")
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return err
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}
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}
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if theme.FullImage != "" {
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if dev.DebugMode {
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log.Print("Adding theme image")
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}
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err = addStaticFile("./themes/"+themeName+"/"+theme.FullImage, "./themes/"+themeName)
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if err != nil {
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return err
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}
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}
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theme.TemplatesMap = make(map[string]string)
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theme.TmplPtr = make(map[string]interface{})
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if theme.Templates != nil {
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for _, themeTmpl := range theme.Templates {
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theme.TemplatesMap[themeTmpl.Name] = themeTmpl.Source
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theme.TmplPtr[themeTmpl.Name] = tmplPtrMap["o_"+themeTmpl.Source]
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}
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}
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theme.ResourceTemplates = template.New("")
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template.Must(theme.ResourceTemplates.ParseGlob("./themes/" + theme.Name + "/public/*.css"))
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// It should be safe for us to load the files for all the themes in memory, as-long as the admin hasn't setup a ridiculous number of themes
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err = addThemeStaticFiles(theme)
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if err != nil {
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return err
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}
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themes[theme.Name] = theme
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}
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return nil
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}
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func addThemeStaticFiles(theme Theme) error {
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// TODO: Use a function instead of a closure to make this more testable? What about a function call inside the closure to take the theme variable into account?
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return filepath.Walk("./themes/"+theme.Name+"/public", func(path string, f os.FileInfo, err error) error {
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if dev.DebugMode {
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log.Print("Attempting to add static file '" + path + "' for default theme '" + theme.Name + "'")
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}
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if err != nil {
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return err
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}
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if f.IsDir() {
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return nil
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}
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path = strings.Replace(path, "\\", "/", -1)
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data, err := ioutil.ReadFile(path)
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if err != nil {
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return err
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}
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var ext = filepath.Ext(path)
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//log.Print("path ",path)
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//log.Print("ext ",ext)
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if ext == ".css" && len(data) != 0 {
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var b bytes.Buffer
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var pieces = strings.Split(path, "/")
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var filename = pieces[len(pieces)-1]
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//log.Print("filename ", filename)
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err = theme.ResourceTemplates.ExecuteTemplate(&b, filename, CSSData{ComingSoon: "We don't have any data to pass you yet!"})
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if err != nil {
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return err
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}
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data = b.Bytes()
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}
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path = strings.TrimPrefix(path, "themes/"+theme.Name+"/public")
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gzipData := compressBytesGzip(data)
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staticFiles["/static/"+theme.Name+path] = SFile{data, gzipData, 0, int64(len(data)), int64(len(gzipData)), mime.TypeByExtension(ext), f, f.ModTime().UTC().Format(http.TimeFormat)}
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if dev.DebugMode {
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log.Print("Added the '/" + theme.Name + path + "' static file for theme " + theme.Name + ".")
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}
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return nil
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})
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}
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func mapThemeTemplates(theme Theme) {
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if theme.Templates != nil {
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for _, themeTmpl := range theme.Templates {
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if themeTmpl.Name == "" {
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log.Fatal("Invalid destination template name")
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}
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if themeTmpl.Source == "" {
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log.Fatal("Invalid source template name")
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}
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// `go generate` is one possibility for letting plugins inject custom page structs, but it would simply add another step of compilation. It might be simpler than the current build process from the perspective of the administrator?
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destTmplPtr, ok := tmplPtrMap[themeTmpl.Name]
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if !ok {
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return
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}
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sourceTmplPtr, ok := tmplPtrMap[themeTmpl.Source]
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if !ok {
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log.Fatal("The source template doesn't exist!")
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}
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switch dTmplPtr := destTmplPtr.(type) {
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case *func(TopicPage, http.ResponseWriter):
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switch sTmplPtr := sourceTmplPtr.(type) {
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case *func(TopicPage, http.ResponseWriter):
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//overridenTemplates[themeTmpl.Name] = d_tmpl_ptr
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overridenTemplates[themeTmpl.Name] = true
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*dTmplPtr = *sTmplPtr
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default:
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log.Fatal("The source and destination templates are incompatible")
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}
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case *func(TopicsPage, http.ResponseWriter):
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switch sTmplPtr := sourceTmplPtr.(type) {
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case *func(TopicsPage, http.ResponseWriter):
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//overridenTemplates[themeTmpl.Name] = d_tmpl_ptr
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overridenTemplates[themeTmpl.Name] = true
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*dTmplPtr = *sTmplPtr
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default:
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log.Fatal("The source and destination templates are incompatible")
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}
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case *func(ForumPage, http.ResponseWriter):
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switch sTmplPtr := sourceTmplPtr.(type) {
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case *func(ForumPage, http.ResponseWriter):
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//overridenTemplates[themeTmpl.Name] = d_tmpl_ptr
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overridenTemplates[themeTmpl.Name] = true
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*dTmplPtr = *sTmplPtr
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default:
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log.Fatal("The source and destination templates are incompatible")
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}
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case *func(ForumsPage, http.ResponseWriter):
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switch sTmplPtr := sourceTmplPtr.(type) {
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case *func(ForumsPage, http.ResponseWriter):
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//overridenTemplates[themeTmpl.Name] = d_tmpl_ptr
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overridenTemplates[themeTmpl.Name] = true
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*dTmplPtr = *sTmplPtr
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default:
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log.Fatal("The source and destination templates are incompatible")
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}
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case *func(ProfilePage, http.ResponseWriter):
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switch sTmplPtr := sourceTmplPtr.(type) {
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case *func(ProfilePage, http.ResponseWriter):
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//overridenTemplates[themeTmpl.Name] = d_tmpl_ptr
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overridenTemplates[themeTmpl.Name] = true
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*dTmplPtr = *sTmplPtr
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default:
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log.Fatal("The source and destination templates are incompatible")
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}
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case *func(CreateTopicPage, http.ResponseWriter):
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switch sTmplPtr := sourceTmplPtr.(type) {
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case *func(CreateTopicPage, http.ResponseWriter):
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//overridenTemplates[themeTmpl.Name] = d_tmpl_ptr
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overridenTemplates[themeTmpl.Name] = true
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*dTmplPtr = *sTmplPtr
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default:
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log.Fatal("The source and destination templates are incompatible")
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}
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case *func(Page, http.ResponseWriter):
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switch sTmplPtr := sourceTmplPtr.(type) {
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case *func(Page, http.ResponseWriter):
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//overridenTemplates[themeTmpl.Name] = d_tmpl_ptr
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overridenTemplates[themeTmpl.Name] = true
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*dTmplPtr = *sTmplPtr
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default:
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log.Fatal("The source and destination templates are incompatible")
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}
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default:
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log.Fatal("Unknown destination template type!")
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}
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}
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}
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}
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func resetTemplateOverrides() {
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log.Print("Resetting the template overrides")
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for name := range overridenTemplates {
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log.Print("Resetting '" + name + "' template override")
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originPointer, ok := tmplPtrMap["o_"+name]
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if !ok {
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//log.Fatal("The origin template doesn't exist!")
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log.Print("The origin template doesn't exist!")
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return
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}
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destTmplPtr, ok := tmplPtrMap[name]
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if !ok {
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//log.Fatal("The destination template doesn't exist!")
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log.Print("The destination template doesn't exist!")
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return
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}
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// Not really a pointer, more of a function handle, an artifact from one of the earlier versions of themes.go
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switch oPtr := originPointer.(type) {
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case func(TopicPage, http.ResponseWriter):
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switch dPtr := destTmplPtr.(type) {
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case *func(TopicPage, http.ResponseWriter):
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*dPtr = oPtr
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default:
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log.Fatal("The origin and destination templates are incompatible")
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}
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case func(TopicsPage, http.ResponseWriter):
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switch dPtr := destTmplPtr.(type) {
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case *func(TopicsPage, http.ResponseWriter):
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*dPtr = oPtr
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default:
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log.Fatal("The origin and destination templates are incompatible")
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}
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case func(ForumPage, http.ResponseWriter):
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switch dPtr := destTmplPtr.(type) {
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case *func(ForumPage, http.ResponseWriter):
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*dPtr = oPtr
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default:
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log.Fatal("The origin and destination templates are incompatible")
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}
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case func(ForumsPage, http.ResponseWriter):
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switch dPtr := destTmplPtr.(type) {
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case *func(ForumsPage, http.ResponseWriter):
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*dPtr = oPtr
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default:
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log.Fatal("The origin and destination templates are incompatible")
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}
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case func(ProfilePage, http.ResponseWriter):
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switch dPtr := destTmplPtr.(type) {
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case *func(ProfilePage, http.ResponseWriter):
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*dPtr = oPtr
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default:
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log.Fatal("The origin and destination templates are incompatible")
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}
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case func(CreateTopicPage, http.ResponseWriter):
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switch dPtr := destTmplPtr.(type) {
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case *func(CreateTopicPage, http.ResponseWriter):
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*dPtr = oPtr
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default:
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log.Fatal("The origin and destination templates are incompatible")
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}
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case func(Page, http.ResponseWriter):
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switch dPtr := destTmplPtr.(type) {
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case *func(Page, http.ResponseWriter):
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*dPtr = oPtr
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default:
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log.Fatal("The origin and destination templates are incompatible")
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}
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default:
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log.Fatal("Unknown destination template type!")
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}
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log.Print("The template override was reset")
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}
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overridenTemplates = make(map[string]bool)
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log.Print("All of the template overrides have been reset")
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}
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// NEW method of doing theme templates to allow one user to have a different theme to another. Under construction.
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// TODO: Generate the type switch instead of writing it by hand
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// TODO: Cut the number of types in half
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func RunThemeTemplate(theme string, template string, pi interface{}, w http.ResponseWriter) {
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switch tmplO := GetThemeTemplate(theme, template).(type) {
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case *func(TopicPage, http.ResponseWriter):
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var tmpl = *tmplO
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tmpl(pi.(TopicPage), w)
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case *func(TopicsPage, http.ResponseWriter):
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var tmpl = *tmplO
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tmpl(pi.(TopicsPage), w)
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case *func(ForumPage, http.ResponseWriter):
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var tmpl = *tmplO
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tmpl(pi.(ForumPage), w)
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case *func(ForumsPage, http.ResponseWriter):
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var tmpl = *tmplO
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tmpl(pi.(ForumsPage), w)
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case *func(ProfilePage, http.ResponseWriter):
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var tmpl = *tmplO
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tmpl(pi.(ProfilePage), w)
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case *func(CreateTopicPage, http.ResponseWriter):
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var tmpl = *tmplO
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tmpl(pi.(CreateTopicPage), w)
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case *func(Page, http.ResponseWriter):
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var tmpl = *tmplO
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tmpl(pi.(Page), w)
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case func(TopicPage, http.ResponseWriter):
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tmplO(pi.(TopicPage), w)
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case func(TopicsPage, http.ResponseWriter):
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tmplO(pi.(TopicsPage), w)
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case func(ForumPage, http.ResponseWriter):
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tmplO(pi.(ForumPage), w)
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case func(ForumsPage, http.ResponseWriter):
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tmplO(pi.(ForumsPage), w)
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case func(ProfilePage, http.ResponseWriter):
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tmplO(pi.(ProfilePage), w)
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case func(CreateTopicPage, http.ResponseWriter):
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tmplO(pi.(CreateTopicPage), w)
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case func(Page, http.ResponseWriter):
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tmplO(pi.(Page), w)
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case string:
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mapping, ok := themes[defaultThemeBox.Load().(string)].TemplatesMap[template]
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if !ok {
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mapping = template
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}
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err := templates.ExecuteTemplate(w, mapping+".html", pi)
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if err != nil {
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LogError(err)
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}
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default:
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log.Print("theme ", theme)
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log.Print("template ", template)
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log.Print("pi ", pi)
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log.Print("tmplO ", tmplO)
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valueOf := reflect.ValueOf(tmplO)
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log.Print("initial valueOf.Type()", valueOf.Type())
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for valueOf.Kind() == reflect.Interface || valueOf.Kind() == reflect.Ptr {
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valueOf = valueOf.Elem()
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log.Print("valueOf.Elem().Type() ", valueOf.Type())
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}
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log.Print("deferenced valueOf.Type() ", valueOf.Type())
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log.Print("valueOf.Kind() ", valueOf.Kind())
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LogError(errors.New("Unknown template type"))
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}
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}
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// GetThemeTemplate attempts to get the template for a specific theme, otherwise it falls back on the default template pointer, which if absent will fallback onto the template interpreter
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func GetThemeTemplate(theme string, template string) interface{} {
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tmpl, ok := themes[theme].TmplPtr[template]
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if ok {
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return tmpl
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}
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tmpl, ok = tmplPtrMap[template]
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if ok {
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return tmpl
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}
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return template
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}
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// CreateThemeTemplate creates a theme template on the current default theme
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func CreateThemeTemplate(theme string, name string) {
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themes[theme].TmplPtr[name] = func(pi Page, w http.ResponseWriter) {
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mapping, ok := themes[defaultThemeBox.Load().(string)].TemplatesMap[name]
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if !ok {
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mapping = name
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}
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err := templates.ExecuteTemplate(w, mapping+".html", pi)
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if err != nil {
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InternalError(err, w)
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}
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}
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}
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func GetDefaultThemeName() string {
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return defaultThemeBox.Load().(string)
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}
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func SetDefaultThemeName(name string) {
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defaultThemeBox.Store(name)
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}
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