gosora/common/files.go

358 lines
11 KiB
Go

package common
import (
"bytes"
"compress/gzip"
"crypto/sha256"
"encoding/hex"
"errors"
"fmt"
"io/ioutil"
"mime"
"net/http"
"os"
"path/filepath"
"strconv"
"strings"
"sync"
"github.com/Azareal/Gosora/tmpl_client"
)
type SFileList map[string]SFile
var StaticFiles SFileList = make(map[string]SFile)
var staticFileMutex sync.RWMutex
type SFile struct {
Data []byte
GzipData []byte
Sha256 string
Pos int64
Length int64
GzipLength int64
Mimetype string
Info os.FileInfo
FormattedModTime string
}
type CSSData struct {
Phrases map[string]string
}
func (list SFileList) JSTmplInit() error {
DebugLog("Initialising the client side templates")
return filepath.Walk("./tmpl_client", func(path string, f os.FileInfo, err error) error {
if f.IsDir() || strings.HasSuffix(path, "template_list.go") || strings.HasSuffix(path, "stub.go") {
return nil
}
path = strings.Replace(path, "\\", "/", -1)
DebugLog("Processing client template " + path)
data, err := ioutil.ReadFile(path)
if err != nil {
return err
}
path = strings.TrimPrefix(path, "tmpl_client/")
tmplName := strings.TrimSuffix(path, ".go")
shortName := strings.TrimPrefix(tmplName, "template_")
var replace = func(data []byte, replaceThis string, withThis string) []byte {
return bytes.Replace(data, []byte(replaceThis), []byte(withThis), -1)
}
startIndex, hasFunc := skipAllUntilCharsExist(data, 0, []byte("func init() {"))
if !hasFunc {
return errors.New("no init function found")
}
data = data[startIndex-len([]byte("func init() {")):]
data = replace(data, "func ", "function ")
data = replace(data, "function init() {", "if(tmplInits===undefined) var tmplInits = {};\ntmplInits[\""+tmplName+"\"] = ")
data = replace(data, " error {\n", " {\nlet out = \"\"\n")
funcIndex, hasFunc := skipAllUntilCharsExist(data, 0, []byte("function Template_"))
if !hasFunc {
return errors.New("no template function found")
}
spaceIndex, hasSpace := skipUntilIfExists(data, funcIndex, ' ')
if !hasSpace {
return errors.New("no spaces found after the template function name")
}
endBrace, hasBrace := skipUntilIfExists(data, spaceIndex, ')')
if !hasBrace {
return errors.New("no right brace found after the template function name")
}
fmt.Println("spaceIndex: ", spaceIndex)
fmt.Println("endBrace: ", endBrace)
fmt.Println("string(data[spaceIndex:endBrace]): ", string(data[spaceIndex:endBrace]))
preLen := len(data)
data = replace(data, string(data[spaceIndex:endBrace]), "")
data = replace(data, "))\n", " \n")
endBrace -= preLen - len(data) // Offset it as we've deleted portions
fmt.Println("new endBrace: ", endBrace)
fmt.Println("data: ", string(data))
/*var showPos = func(data []byte, index int) (out string) {
out = "["
for j, char := range data {
if index == j {
out += "[" + string(char) + "] "
} else {
out += string(char) + " "
}
}
return out + "]"
}*/
data = replace(data, `)
if !ok {
return errors.New("invalid page struct value")
}`, "*/tmpl_"+shortName+"_vars = tmpl_"+shortName+"_i")
// ? 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
var each = func(phrase string, handle func(index int)) {
//fmt.Println("find each '" + phrase + "'")
var index = endBrace
if index < 0 {
panic("index under zero: " + strconv.Itoa(index))
}
var foundIt bool
for {
//fmt.Println("in index: ", index)
//fmt.Println("pos: ", showPos(data, index))
index, foundIt = skipAllUntilCharsExist(data, index, []byte(phrase))
if !foundIt {
break
}
handle(index)
}
}
each("strconv.Itoa(", func(index int) {
braceAt, hasEndBrace := skipUntilIfExistsOrLine(data, index, ')')
if hasEndBrace {
data[braceAt] = ' ' // Blank it
}
})
each("[]byte(", func(index int) {
braceAt, hasEndBrace := skipUntilIfExistsOrLine(data, index, ')')
if hasEndBrace {
data[braceAt] = ' ' // Blank it
}
})
each("StringToBytes(", func(index int) {
braceAt, hasEndBrace := skipUntilIfExistsOrLine(data, index, ')')
if hasEndBrace {
data[braceAt] = ' ' // Blank it
}
})
each("w.Write(", func(index int) {
braceAt, hasEndBrace := skipUntilIfExistsOrLine(data, index, ')')
if hasEndBrace {
data[braceAt] = ' ' // Blank it
}
})
each("RelativeTime(", func(index int) {
braceAt, _ := skipUntilIfExistsOrLine(data, index, 10)
if data[braceAt-1] == ' ' {
data[braceAt-1] = ' ' // Blank it
}
})
each("if ", func(index int) {
//fmt.Println("if index: ", index)
braceAt, hasBrace := skipUntilIfExistsOrLine(data, index, '{')
if hasBrace {
if data[braceAt-1] != ' ' {
panic("couldn't find space before brace, found ' " + string(data[braceAt-1]) + "' instead")
}
data[braceAt-1] = ')' // Drop a brace here to satisfy JS
}
})
each("for _, item := range ", func(index int) {
//fmt.Println("for index: ", index)
braceAt, hasBrace := skipUntilIfExists(data, index, '{')
if hasBrace {
if data[braceAt-1] != ' ' {
panic("couldn't find space before brace, found ' " + string(data[braceAt-1]) + "' instead")
}
data[braceAt-1] = ')' // Drop a brace here to satisfy JS
}
})
data = replace(data, "for _, item := range ", "for(item of ")
data = replace(data, "w.Write([]byte(", "out += ")
data = replace(data, "w.Write(StringToBytes(", "out += ")
data = replace(data, "w.Write(", "out += ")
data = replace(data, "strconv.Itoa(", "")
data = replace(data, "strconv.FormatInt(", "")
data = replace(data, "common.", "")
data = replace(data, "phrases.", "")
data = replace(data, ", 10;", "")
data = replace(data, shortName+"_tmpl_phrase_id = RegisterTmplPhraseNames([]string{", "[")
data = replace(data, "var plist = GetTmplPhrasesBytes("+shortName+"_tmpl_phrase_id)", "let plist = tmplPhrases[\""+tmplName+"\"];")
data = replace(data, "var cached_var_", "let cached_var_")
data = replace(data, `tmpl_`+shortName+`_vars, ok := tmpl_`+shortName+`_i.`, `/*`)
data = replace(data, "[]byte(", "")
data = replace(data, "StringToBytes(", "")
data = replace(data, "RelativeTime(tmpl_"+shortName+"_vars.", "tmpl_"+shortName+"_vars.Relative")
// TODO: Format dates properly on the client side
data = replace(data, ".Format(\"2006-01-02 15:04:05\"", "")
data = replace(data, ", 10", "")
data = replace(data, "if ", "if(")
data = replace(data, "return nil", "return out")
data = replace(data, " )", ")")
data = replace(data, " \n", "\n")
data = replace(data, "\n", ";\n")
data = replace(data, "{;", "{")
data = replace(data, "};", "}")
data = replace(data, "[;", "[")
data = replace(data, ";;", ";")
data = replace(data, ",;", ",")
data = replace(data, "=;", "=")
data = replace(data, `,
});
}`, "\n\t];")
data = replace(data, `=
}`, "= []")
fragset := tmpl.GetFrag(shortName)
if fragset != nil {
var sfrags = []byte("let " + shortName + "_frags = [];\n")
for _, frags := range fragset {
sfrags = append(sfrags, []byte(shortName+"_frags.push(`"+string(frags)+"`);\n")...)
}
data = append(sfrags, data...)
}
data = replace(data, "\n;", "\n")
for name, _ := range Themes {
if strings.HasSuffix(shortName, "_"+name) {
data = append(data, "\nvar Template_"+strings.TrimSuffix(shortName, "_"+name)+" = Template_"+shortName+";"...)
break
}
}
path = tmplName + ".js"
DebugLog("js path: ", path)
var ext = filepath.Ext("/tmpl_client/" + path)
gzipData, err := compressBytesGzip(data)
if err != nil {
return err
}
// Get a checksum for CSPs and cache busting
hasher := sha256.New()
hasher.Write(data)
checksum := hex.EncodeToString(hasher.Sum(nil))
list.Set("/static/"+path, SFile{data, gzipData, checksum, 0, int64(len(data)), int64(len(gzipData)), mime.TypeByExtension(ext), f, f.ModTime().UTC().Format(http.TimeFormat)})
DebugLogf("Added the '%s' static file.", path)
return nil
})
}
func (list SFileList) Init() error {
return filepath.Walk("./public", func(path string, f os.FileInfo, err error) error {
if f.IsDir() {
return nil
}
path = strings.Replace(path, "\\", "/", -1)
data, err := ioutil.ReadFile(path)
if err != nil {
return err
}
path = strings.TrimPrefix(path, "public/")
var ext = filepath.Ext("/public/" + path)
mimetype := mime.TypeByExtension(ext)
// Get a checksum for CSPs and cache busting
hasher := sha256.New()
hasher.Write(data)
checksum := hex.EncodeToString(hasher.Sum(nil))
// Avoid double-compressing images
var gzipData []byte
if mimetype != "image/jpeg" && mimetype != "image/png" && mimetype != "image/gif" {
gzipData, err = compressBytesGzip(data)
if err != nil {
return err
}
// Don't use Gzip if we get meagre gains from it as it takes longer to process the responses
if len(gzipData) >= (len(data) + 100) {
gzipData = nil
} else {
diff := len(data) - len(gzipData)
if diff <= len(data)/100 {
gzipData = nil
}
}
}
list.Set("/static/"+path, SFile{data, gzipData, checksum, 0, int64(len(data)), int64(len(gzipData)), mimetype, f, f.ModTime().UTC().Format(http.TimeFormat)})
DebugLogf("Added the '%s' static file.", path)
return nil
})
}
func (list SFileList) Add(path string, prefix string) error {
data, err := ioutil.ReadFile(path)
if err != nil {
return err
}
fi, err := os.Open(path)
if err != nil {
return err
}
f, err := fi.Stat()
if err != nil {
return err
}
var ext = filepath.Ext(path)
path = strings.TrimPrefix(path, prefix)
gzipData, err := compressBytesGzip(data)
if err != nil {
return err
}
// Get a checksum for CSPs and cache busting
hasher := sha256.New()
hasher.Write(data)
checksum := hex.EncodeToString(hasher.Sum(nil))
list.Set("/static"+path, SFile{data, gzipData, checksum, 0, int64(len(data)), int64(len(gzipData)), mime.TypeByExtension(ext), f, f.ModTime().UTC().Format(http.TimeFormat)})
DebugLogf("Added the '%s' static file", path)
return nil
}
func (list SFileList) Get(name string) (file SFile, exists bool) {
staticFileMutex.RLock()
defer staticFileMutex.RUnlock()
file, exists = list[name]
return file, exists
}
func (list SFileList) Set(name string, data SFile) {
staticFileMutex.Lock()
defer staticFileMutex.Unlock()
list[name] = data
}
func compressBytesGzip(in []byte) ([]byte, error) {
var buff bytes.Buffer
gz, err := gzip.NewWriterLevel(&buff, gzip.BestCompression)
if err != nil {
return nil, err
}
_, err = gz.Write(in)
if err != nil {
return nil, err
}
err = gz.Close()
if err != nil {
return nil, err
}
return buff.Bytes(), nil
}