mirror of
https://github.com/mickael-kerjean/filestash.git
synced 2025-10-29 00:55:51 +08:00
415 lines
10 KiB
Go
415 lines
10 KiB
Go
package ctrl
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import (
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"encoding/base64"
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"fmt"
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"hash/fnv"
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. "github.com/mickael-kerjean/filestash/server/common"
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"github.com/mickael-kerjean/filestash/server/model"
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"io"
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"net/http"
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"os"
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"path/filepath"
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"strings"
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"strconv"
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"time"
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)
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type FileInfo struct {
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Name string `json:"name"`
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Type string `json:"type"`
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Size int64 `json:"size"`
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Time int64 `json:"time"`
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}
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var FileCache AppCache
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func init() {
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FileCache = NewAppCache()
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cachePath := filepath.Join(GetCurrentDir(), TMP_PATH)
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FileCache.OnEvict(func(key string, value interface{}) {
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os.RemoveAll(filepath.Join(cachePath, key))
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})
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}
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func FileLs(ctx App, res http.ResponseWriter, req *http.Request) {
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if model.CanRead(&ctx) == false {
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if model.CanUpload(&ctx) == false {
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SendErrorResult(res, ErrPermissionDenied)
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return
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}
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SendSuccessResults(res, make([]FileInfo, 0))
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return
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}
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path, err := pathBuilder(ctx, req.URL.Query().Get("path"))
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if err != nil {
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SendErrorResult(res, err)
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return
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}
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entries, err := ctx.Backend.Ls(path)
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if err != nil {
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SendErrorResult(res, err)
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return
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}
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go model.SProc.HintLs(&ctx, path)
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files := make([]FileInfo, len(entries))
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etagger := fnv.New32()
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etagger.Write([]byte(path + strconv.Itoa(len(entries))))
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for i:=0; i<len(entries); i++ {
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name := entries[i].Name()
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modTime := entries[i].ModTime().UnixNano() / int64(time.Millisecond)
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if i < 200 { // etag is generated from a few values to avoid large memory usage
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etagger.Write([]byte(name + strconv.Itoa(int(modTime))))
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}
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files[i] = FileInfo{
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Name: name,
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Size: entries[i].Size(),
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Time: modTime,
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Type: func(isDir bool) string {
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if isDir == true {
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return "directory"
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}
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return "file"
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}(entries[i].IsDir()),
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}
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}
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var perms Metadata = Metadata{}
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if obj, ok := ctx.Backend.(interface{ Meta(path string) Metadata }); ok {
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perms = obj.Meta(path)
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}
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if model.CanEdit(&ctx) == false {
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perms.CanCreateFile = NewBool(false)
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perms.CanCreateDirectory = NewBool(false)
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perms.CanRename = NewBool(false)
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perms.CanMove = NewBool(false)
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perms.CanDelete = NewBool(false)
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}
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if model.CanUpload(&ctx) == false {
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perms.CanCreateDirectory = NewBool(false)
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perms.CanRename = NewBool(false)
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perms.CanMove = NewBool(false)
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perms.CanDelete = NewBool(false)
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}
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if model.CanShare(&ctx) == false {
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perms.CanShare = NewBool(false)
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}
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etagValue := base64.StdEncoding.EncodeToString(etagger.Sum(nil))
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res.Header().Set("Etag", etagValue)
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if etagValue != "" && req.Header.Get("If-None-Match") == etagValue {
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res.WriteHeader(http.StatusNotModified)
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return
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}
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SendSuccessResultsWithMetadata(res, files, perms)
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}
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func FileCat(ctx App, res http.ResponseWriter, req *http.Request) {
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header := res.Header()
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http.SetCookie(res, &http.Cookie{
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Name: "download",
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Value: "",
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MaxAge: -1,
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Path: "/",
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})
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if model.CanRead(&ctx) == false {
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SendErrorResult(res, ErrPermissionDenied)
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return
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}
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path, err := pathBuilder(ctx, req.URL.Query().Get("path"))
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if err != nil {
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SendErrorResult(res, err)
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return
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}
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var file io.ReadCloser
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var contentLength int64 = -1
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var needToCreateCache bool = false
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// use our cache if necessary (range request) when possible
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if req.Header.Get("range") != "" {
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ctx.Session["_path"] = path
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if p := FileCache.Get(ctx.Session); p != nil {
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f, err := os.OpenFile(p.(string), os.O_RDONLY, os.ModePerm);
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if err == nil {
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file = f
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if fi, err := f.Stat(); err == nil {
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contentLength = fi.Size()
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}
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}
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}
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}
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// perform the actual `cat` if needed
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if file == nil {
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if file, err = ctx.Backend.Cat(path); err != nil {
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SendErrorResult(res, err)
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return
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}
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header.Set("Content-Type", GetMimeType(req.URL.Query().Get("path")))
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if req.Header.Get("range") != "" {
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needToCreateCache = true
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}
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go model.SProc.HintLs(&ctx, filepath.Dir(path) + "/")
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}
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// plugin hooks
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for _, obj := range Hooks.Get.ProcessFileContentBeforeSend() {
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if file, err = obj(file, &ctx, &res, req); err != nil {
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SendErrorResult(res, err)
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return
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}
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}
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// The extra complexity is to support: https://en.wikipedia.org/wiki/Progressive_download
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// => range request requires a seeker to work, some backend support it, some don't. 2 strategies:
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// 1. backend support Seek: use what the current backend gives us
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// 2. backend doesn't support Seek: build up a cache so that subsequent call don't trigger multiple downloads
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if req.Header.Get("range") != "" && needToCreateCache == true {
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if obj, ok := file.(io.Seeker); ok == true {
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if size, err := obj.Seek(0, io.SeekEnd); err == nil {
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if _, err = obj.Seek(0, io.SeekStart); err == nil {
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contentLength = size
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}
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}
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} else {
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tmpPath := filepath.Join(GetCurrentDir(), filepath.Join(GetCurrentDir(), TMP_PATH), "file_" + QuickString(20) + ".dat")
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f, err := os.OpenFile(tmpPath, os.O_RDWR|os.O_CREATE, os.ModePerm);
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if err != nil {
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SendErrorResult(res, err)
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return
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}
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if _, err = io.Copy(f, file); err != nil {
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f.Close()
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file.Close()
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SendErrorResult(res, err)
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return
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}
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f.Close()
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file.Close()
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if f, err = os.OpenFile(tmpPath, os.O_RDONLY, os.ModePerm); err != nil {
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SendErrorResult(res, err)
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return
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}
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FileCache.Set(ctx.Session, tmpPath)
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if fi, err := f.Stat(); err == nil {
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contentLength = fi.Size()
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}
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file = f
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}
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}
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// Range request: find how much data we need to send
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var ranges [][]int64
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if req.Header.Get("range") != "" {
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ranges = make([][]int64, 0)
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for _, r := range strings.Split(strings.TrimPrefix(req.Header.Get("range"), "bytes="), ",") {
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r = strings.TrimSpace(r)
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if r == "" {
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continue
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}
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var start int64 = -1
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var end int64 = -1
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sides := strings.Split(r, "-")
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if len(sides) == 2 {
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if start, err = strconv.ParseInt(sides[0], 10, 64); err != nil || start < 0 {
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start = 0
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}
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if end, err = strconv.ParseInt(sides[1], 10, 64); err != nil || end < start {
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end = contentLength - 1
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}
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}
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if start != -1 && end != -1 && end - start >= 0 {
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ranges = append(ranges, []int64{start, end})
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}
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}
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}
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// publish headers
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if contentLength != -1 {
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header.Set("Content-Length", fmt.Sprintf("%d", contentLength))
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}
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if header.Get("Content-Security-Policy") == "" {
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header.Set("Content-Security-Policy", "default-src 'none'; img-src 'self'; style-src 'unsafe-inline'")
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}
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header.Set("Accept-Ranges", "bytes")
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// Send data to the client
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if req.Method != "HEAD" {
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if f, ok := file.(io.ReadSeeker); ok && len(ranges) > 0 {
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if _, err = f.Seek(ranges[0][0], io.SeekStart); err == nil {
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header.Set("Content-Range", fmt.Sprintf("bytes %d-%d/%d", ranges[0][0], ranges[0][1], contentLength))
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header.Set("Content-Length", fmt.Sprintf("%d", ranges[0][1] - ranges[0][0] + 1))
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res.WriteHeader(http.StatusPartialContent)
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io.CopyN(res, f, ranges[0][1] - ranges[0][0] + 1)
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} else {
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res.WriteHeader(http.StatusRequestedRangeNotSatisfiable)
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}
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} else {
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io.Copy(res, file)
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}
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}
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file.Close()
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}
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func FileAccess(ctx App, res http.ResponseWriter, req *http.Request) {
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allowed := []string{}
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if model.CanRead(&ctx){
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allowed = append(allowed, "GET")
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}
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if model.CanEdit(&ctx){
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allowed = append(allowed, "PUT")
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}
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if model.CanUpload(&ctx){
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allowed = append(allowed, "POST")
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}
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header := res.Header()
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header.Set("Allow", strings.Join(allowed, ", "))
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SendSuccessResult(res, nil)
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}
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func FileSave(ctx App, res http.ResponseWriter, req *http.Request) {
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if model.CanEdit(&ctx) == false {
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SendErrorResult(res, NewError("Permission denied", 403))
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return
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}
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path, err := pathBuilder(ctx, req.URL.Query().Get("path"))
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if err != nil {
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SendErrorResult(res, err)
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return
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}
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file, _, err := req.FormFile("file")
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if err != nil {
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SendErrorResult(res, err)
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return
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}
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defer file.Close()
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err = ctx.Backend.Save(path, file)
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file.Close()
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if err != nil {
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SendErrorResult(res, NewError(err.Error(), 403))
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return
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}
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go model.SProc.HintLs(&ctx, filepath.Dir(path) + "/")
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go model.SProc.HintFile(&ctx, path)
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SendSuccessResult(res, nil)
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}
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func FileMv(ctx App, res http.ResponseWriter, req *http.Request) {
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if model.CanEdit(&ctx) == false {
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SendErrorResult(res, NewError("Permission denied", 403))
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return
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}
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from, err := pathBuilder(ctx, req.URL.Query().Get("from"))
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if err != nil {
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SendErrorResult(res, err)
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return
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}
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to, err := pathBuilder(ctx, req.URL.Query().Get("to"))
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if err != nil {
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SendErrorResult(res, err)
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return
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}
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if from == "" || to == "" {
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SendErrorResult(res, NewError("missing path parameter", 400))
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return
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}
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err = ctx.Backend.Mv(from, to)
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if err != nil {
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SendErrorResult(res, err)
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return
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}
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go model.SProc.HintRm(&ctx, filepath.Dir(from) + "/")
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go model.SProc.HintLs(&ctx, filepath.Dir(to) + "/")
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SendSuccessResult(res, nil)
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}
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func FileRm(ctx App, res http.ResponseWriter, req *http.Request) {
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if model.CanEdit(&ctx) == false {
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SendErrorResult(res, NewError("Permission denied", 403))
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return
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}
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path, err := pathBuilder(ctx, req.URL.Query().Get("path"))
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if err != nil {
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SendErrorResult(res, err)
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return
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}
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err = ctx.Backend.Rm(path)
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if err != nil {
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SendErrorResult(res, err)
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return
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}
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model.SProc.HintRm(&ctx, path)
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SendSuccessResult(res, nil)
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}
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func FileMkdir(ctx App, res http.ResponseWriter, req *http.Request) {
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if model.CanUpload(&ctx) == false {
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SendErrorResult(res, NewError("Permission denied", 403))
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return
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}
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path, err := pathBuilder(ctx, req.URL.Query().Get("path"))
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if err != nil {
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SendErrorResult(res, err)
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return
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}
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err = ctx.Backend.Mkdir(path)
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if err != nil {
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SendErrorResult(res, err)
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return
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}
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go model.SProc.HintLs(&ctx, filepath.Dir(path) + "/")
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SendSuccessResult(res, nil)
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}
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func FileTouch(ctx App, res http.ResponseWriter, req *http.Request) {
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if model.CanUpload(&ctx) == false {
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SendErrorResult(res, NewError("Permission denied", 403))
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return
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}
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path, err := pathBuilder(ctx, req.URL.Query().Get("path"))
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if err != nil {
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SendErrorResult(res, err)
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return
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}
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err = ctx.Backend.Touch(path)
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if err != nil {
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SendErrorResult(res, err)
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return
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}
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go model.SProc.HintLs(&ctx, filepath.Dir(path) + "/")
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SendSuccessResult(res, nil)
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}
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func pathBuilder(ctx App, path string) (string, error) {
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if path == "" {
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return "", NewError("No path available", 400)
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}
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sessionPath := ctx.Session["path"]
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basePath := filepath.Join(sessionPath, path)
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if path[len(path)-1:] == "/" && basePath != "/" {
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basePath += "/"
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}
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if strings.HasPrefix(basePath, ctx.Session["path"]) == false {
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return "", NewError("There's nothing here", 403)
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}
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return basePath, nil
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}
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