478 lines
13 KiB
Go
478 lines
13 KiB
Go
package common
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import (
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"bytes"
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"compress/gzip"
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"crypto/sha256"
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"encoding/hex"
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"errors"
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"fmt"
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"io/ioutil"
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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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"strconv"
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"strings"
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"sync"
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tmpl "github.com/Azareal/Gosora/tmpl_client"
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"github.com/andybalholm/brotli"
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)
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type SFileList map[string]SFile
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var StaticFiles SFileList = make(map[string]SFile)
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var staticFileMutex sync.RWMutex
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type SFile struct {
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// TODO: Move these to the end?
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Data []byte
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GzipData []byte
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BrData []byte
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Sha256 string
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OName string
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Pos int64
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Length int64
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StrLength string
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GzipLength int64
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StrGzipLength string
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BrLength int64
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StrBrLength string
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Mimetype string
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Info os.FileInfo
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FormattedModTime string
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}
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type CSSData struct {
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Phrases map[string]string
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}
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func (list SFileList) JSTmplInit() error {
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DebugLog("Initialising the client side templates")
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return filepath.Walk("./tmpl_client", func(path string, f os.FileInfo, err error) error {
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if f.IsDir() || strings.HasSuffix(path, "tmpl_list.go") || strings.HasSuffix(path, "stub.go") {
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return nil
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}
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path = strings.Replace(path, "\\", "/", -1)
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DebugLog("Processing client template " + path)
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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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path = strings.TrimPrefix(path, "tmpl_client/")
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tmplName := strings.TrimSuffix(path, ".jgo")
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shortName := strings.TrimPrefix(tmplName, "tmpl_")
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replace := func(data []byte, replaceThis, withThis string) []byte {
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return bytes.Replace(data, []byte(replaceThis), []byte(withThis), -1)
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}
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rep := func(replaceThis, withThis string) {
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data = replace(data, replaceThis, withThis)
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}
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startIndex, hasFunc := skipAllUntilCharsExist(data, 0, []byte("if(tmplInits===undefined)"))
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if !hasFunc {
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return errors.New("no init map found")
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}
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data = data[startIndex-len([]byte("if(tmplInits===undefined)")):]
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rep("// nolint", "")
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//rep("func ", "function ")
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rep("func ", "function ")
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rep(" error {\n", " {\nlet o=\"\"\n")
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funcIndex, hasFunc := skipAllUntilCharsExist(data, 0, []byte("function Tmpl_"))
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if !hasFunc {
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return errors.New("no template function found")
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}
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spaceIndex, hasSpace := skipUntilIfExists(data, funcIndex, ' ')
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if !hasSpace {
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return errors.New("no spaces found after the template function name")
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}
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endBrace, hasBrace := skipUntilIfExists(data, spaceIndex, ')')
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if !hasBrace {
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return errors.New("no right brace found after the template function name")
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}
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fmt.Println("spaceIndex: ", spaceIndex)
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fmt.Println("endBrace: ", endBrace)
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fmt.Println("string(data[spaceIndex:endBrace]): ", string(data[spaceIndex:endBrace]))
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preLen := len(data)
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rep(string(data[spaceIndex:endBrace]), "")
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rep("))\n", " \n")
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endBrace -= preLen - len(data) // Offset it as we've deleted portions
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fmt.Println("new endBrace: ", endBrace)
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fmt.Println("data: ", string(data))
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/*showPos := func(data []byte, index int) (out string) {
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out = "["
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for j, char := range data {
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if index == j {
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out += "[" + string(char) + "] "
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} else {
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out += string(char) + " "
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}
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}
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return out + "]"
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}*/
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// ? Can we just use a regex? I'm thinking of going more efficient, or just outright rolling wasm, this is a temp hack in a place where performance doesn't particularly matter
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each := func(phrase string, h func(index int)) {
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//fmt.Println("find each '" + phrase + "'")
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index := endBrace
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if index < 0 {
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panic("index under zero: " + strconv.Itoa(index))
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}
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var foundIt bool
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for {
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//fmt.Println("in index: ", index)
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//fmt.Println("pos: ", showPos(data, index))
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index, foundIt = skipAllUntilCharsExist(data, index, []byte(phrase))
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if !foundIt {
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break
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}
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h(index)
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}
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}
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each("strconv.Itoa(", func(index int) {
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braceAt, hasEndBrace := skipUntilIfExistsOrLine(data, index, ')')
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if hasEndBrace {
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data[braceAt] = ' ' // Blank it
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}
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})
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each("[]byte(", func(index int) {
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braceAt, hasEndBrace := skipUntilIfExistsOrLine(data, index, ')')
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if hasEndBrace {
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data[braceAt] = ' ' // Blank it
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}
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})
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each("StringToBytes(", func(index int) {
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braceAt, hasEndBrace := skipUntilIfExistsOrLine(data, index, ')')
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if hasEndBrace {
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data[braceAt] = ' ' // Blank it
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}
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})
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each("w.Write(", func(index int) {
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braceAt, hasEndBrace := skipUntilIfExistsOrLine(data, index, ')')
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if hasEndBrace {
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data[braceAt] = ' ' // Blank it
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}
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})
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each("RelativeTime(", func(index int) {
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braceAt, _ := skipUntilIfExistsOrLine(data, index, 10)
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if data[braceAt-1] == ' ' {
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data[braceAt-1] = ' ' // Blank it
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}
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})
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each("if ", func(index int) {
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//fmt.Println("if index: ", index)
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braceAt, hasBrace := skipUntilIfExistsOrLine(data, index, '{')
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if hasBrace {
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if data[braceAt-1] != ' ' {
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panic("couldn't find space before brace, found ' " + string(data[braceAt-1]) + "' instead")
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}
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data[braceAt-1] = ')' // Drop a brace here to satisfy JS
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}
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})
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each("for _, item := range ", func(index int) {
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//fmt.Println("for index: ", index)
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braceAt, hasBrace := skipUntilIfExists(data, index, '{')
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if hasBrace {
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if data[braceAt-1] != ' ' {
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panic("couldn't find space before brace, found ' " + string(data[braceAt-1]) + "' instead")
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}
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data[braceAt-1] = ')' // Drop a brace here to satisfy JS
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}
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})
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rep("for _, item := range ", "for(item of ")
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rep("w.Write([]byte(", "o += ")
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rep("w.Write(StringToBytes(", "o += ")
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rep("w.Write(", "o += ")
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rep("+= c.", "+= ")
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rep("strconv.Itoa(", "")
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rep("strconv.FormatInt(", "")
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rep(" c.", "")
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rep("phrases.", "")
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rep(", 10;", "")
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//rep("var plist = GetTmplPhrasesBytes("+shortName+"_tmpl_phrase_id)", "const plist = tmplPhrases[\""+tmplName+"\"];")
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//rep("//var plist = GetTmplPhrasesBytes("+shortName+"_tmpl_phrase_id)", "const "+shortName+"_phrase_arr = tmplPhrases[\""+tmplName+"\"];")
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rep("//var plist = GetTmplPhrasesBytes("+shortName+"_tmpl_phrase_id)", "const pl=tmplPhrases[\""+tmplName+"\"];")
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rep(shortName+"_phrase_arr", "pl")
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rep(shortName+"_phrase", "pl")
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rep("tmpl_"+shortName+"_vars", "t_v")
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rep("var c_v_", "let c_v_")
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rep(`t_vars, ok := tmpl_i.`, `/*`)
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rep("[]byte(", "")
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rep("StringToBytes(", "")
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rep("RelativeTime(t_v.", "t_v.Relative")
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// TODO: Format dates properly on the client side
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rep(".Format(\"2006-01-02 15:04:05\"", "")
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rep(", 10", "")
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rep("if ", "if(")
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rep("return nil", "return o")
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rep(" )", ")")
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rep(" \n", "\n")
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rep("\n", ";\n")
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rep("{;", "{")
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rep("};", "}")
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rep("[;", "[")
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rep(",;", ",")
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rep("=;", "=")
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rep(`,
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});
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}`, "\n\t];")
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rep(`=
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}`, "=[]")
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rep("o += ", "o+=")
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rep(shortName+"_frags[", "fr[")
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rep("function Tmpl_"+shortName+"(t_v) {", "var Tmpl_"+shortName+"=(t_v)=>{")
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fragset := tmpl.GetFrag(shortName)
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if fragset != nil {
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//sfrags := []byte("let " + shortName + "_frags=[\n")
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sfrags := []byte("{const fr=[")
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for i, frags := range fragset {
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//sfrags = append(sfrags, []byte(shortName+"_frags.push(`"+string(frags)+"`);\n")...)
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//sfrags = append(sfrags, []byte("`"+string(frags)+"`,\n")...)
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if i == 0 {
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sfrags = append(sfrags, []byte("`"+string(frags)+"`")...)
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} else {
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sfrags = append(sfrags, []byte(",`"+string(frags)+"`")...)
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}
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}
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//sfrags = append(sfrags, []byte("];\n")...)
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sfrags = append(sfrags, []byte("];")...)
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data = append(sfrags, data...)
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}
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rep("\n;", "\n")
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rep(";;", ";")
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data = append(data, '}')
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for name, _ := range Themes {
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if strings.HasSuffix(shortName, "_"+name) {
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data = append(data, "var Tmpl_"+strings.TrimSuffix(shortName, "_"+name)+"=Tmpl_"+shortName+";"...)
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break
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}
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}
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path = tmplName + ".js"
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DebugLog("js path: ", path)
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ext := filepath.Ext("/tmpl_client/" + path)
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brData, err := CompressBytesBrotli(data)
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if err != nil {
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return err
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}
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// Don't use Brotli if we get meagre gains from it as it takes longer to process the responses
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if len(brData) >= (len(data) + 110) {
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brData = nil
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} else {
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diff := len(data) - len(brData)
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if diff <= len(data)/100 {
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brData = nil
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}
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}
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gzipData, err := CompressBytesGzip(data)
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if err != nil {
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return err
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}
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// Don't use Gzip if we get meagre gains from it as it takes longer to process the responses
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if len(gzipData) >= (len(data) + 120) {
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gzipData = nil
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} else {
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diff := len(data) - len(gzipData)
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if diff <= len(data)/100 {
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gzipData = nil
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}
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}
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// Get a checksum for CSPs and cache busting
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hasher := sha256.New()
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hasher.Write(data)
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checksum := hex.EncodeToString(hasher.Sum(nil))
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list.Set("/s/"+path, SFile{data, gzipData, brData, checksum, path + "?h=" + checksum, 0, int64(len(data)), strconv.Itoa(len(data)), int64(len(gzipData)), strconv.Itoa(len(gzipData)), int64(len(brData)), strconv.Itoa(len(brData)), mime.TypeByExtension(ext), f, f.ModTime().UTC().Format(http.TimeFormat)})
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DebugLogf("Added the '%s' static file.", path)
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return nil
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})
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}
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func (list SFileList) Init() error {
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return filepath.Walk("./public", func(path string, f os.FileInfo, err error) error {
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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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path = strings.TrimPrefix(path, "public/")
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ext := filepath.Ext("/public/" + path)
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if ext == ".js" {
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data = bytes.Replace(data, []byte("\r"), []byte(""), -1)
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}
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mimetype := mime.TypeByExtension(ext)
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// Get a checksum for CSPs and cache busting
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hasher := sha256.New()
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hasher.Write(data)
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checksum := hex.EncodeToString(hasher.Sum(nil))
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// Avoid double-compressing images
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var gzipData, brData []byte
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if mimetype != "image/jpeg" && mimetype != "image/png" && mimetype != "image/gif" {
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brData, err = CompressBytesBrotli(data)
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if err != nil {
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return err
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}
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// Don't use Brotli if we get meagre gains from it as it takes longer to process the responses
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if len(brData) >= (len(data) + 130) {
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brData = nil
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} else {
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diff := len(data) - len(brData)
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if diff <= len(data)/100 {
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brData = nil
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}
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}
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gzipData, err = CompressBytesGzip(data)
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if err != nil {
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return err
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}
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// Don't use Gzip if we get meagre gains from it as it takes longer to process the responses
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if len(gzipData) >= (len(data) + 150) {
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gzipData = nil
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} else {
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diff := len(data) - len(gzipData)
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if diff <= len(data)/100 {
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gzipData = nil
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}
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}
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}
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list.Set("/s/"+path, SFile{data, gzipData, brData, checksum, path + "?h=" + checksum, 0, int64(len(data)), strconv.Itoa(len(data)), int64(len(gzipData)), strconv.Itoa(len(gzipData)), int64(len(brData)), strconv.Itoa(len(brData)), mimetype, f, f.ModTime().UTC().Format(http.TimeFormat)})
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DebugLogf("Added the '%s' static file.", path)
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return nil
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})
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}
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func (list SFileList) Add(path, prefix string) error {
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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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fi, err := os.Open(path)
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if err != nil {
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return err
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}
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f, err := fi.Stat()
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if err != nil {
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return err
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}
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ext := filepath.Ext(path)
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path = strings.TrimPrefix(path, prefix)
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brData, err := CompressBytesBrotli(data)
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if err != nil {
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return err
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}
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// Don't use Brotli if we get meagre gains from it as it takes longer to process the responses
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if len(brData) >= (len(data) + 130) {
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brData = nil
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} else {
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diff := len(data) - len(brData)
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if diff <= len(data)/100 {
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brData = nil
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}
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}
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gzipData, err := CompressBytesGzip(data)
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if err != nil {
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return err
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}
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// Don't use Gzip if we get meagre gains from it as it takes longer to process the responses
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if len(gzipData) >= (len(data) + 150) {
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gzipData = nil
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} else {
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diff := len(data) - len(gzipData)
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if diff <= len(data)/100 {
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gzipData = nil
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}
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}
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// Get a checksum for CSPs and cache busting
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hasher := sha256.New()
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hasher.Write(data)
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checksum := hex.EncodeToString(hasher.Sum(nil))
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list.Set("/s/"+path, SFile{data, gzipData, brData, checksum, path + "?h=" + checksum, 0, int64(len(data)), strconv.Itoa(len(data)), int64(len(gzipData)), strconv.Itoa(len(gzipData)), int64(len(brData)), strconv.Itoa(len(brData)), mime.TypeByExtension(ext), f, f.ModTime().UTC().Format(http.TimeFormat)})
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DebugLogf("Added the '%s' static file", path)
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return nil
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}
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func (list SFileList) Get(name string) (file SFile, exists bool) {
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staticFileMutex.RLock()
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defer staticFileMutex.RUnlock()
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file, exists = list[name]
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return file, exists
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}
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func (list SFileList) Set(name string, data SFile) {
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staticFileMutex.Lock()
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defer staticFileMutex.Unlock()
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list[name] = data
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}
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var gzipBestCompress sync.Pool
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func CompressBytesGzip(in []byte) (b []byte, err error) {
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var buf bytes.Buffer
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ii := gzipBestCompress.Get()
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var gz *gzip.Writer
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if ii == nil {
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gz, err = gzip.NewWriterLevel(&buf, gzip.BestCompression)
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if err != nil {
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return nil, err
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}
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} else {
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gz = ii.(*gzip.Writer)
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gz.Reset(&buf)
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}
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_, err = gz.Write(in)
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if err != nil {
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return nil, err
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}
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err = gz.Close()
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if err != nil {
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return nil, err
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}
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gzipBestCompress.Put(gz)
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return buf.Bytes(), nil
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}
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func CompressBytesBrotli(in []byte) ([]byte, error) {
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var buff bytes.Buffer
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br := brotli.NewWriterLevel(&buff, brotli.BestCompression)
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_, err := br.Write(in)
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if err != nil {
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return nil, err
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}
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err = br.Close()
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if err != nil {
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return nil, err
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}
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return buff.Bytes(), nil
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}
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