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responseData.go
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responseData.go
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package serverHandler
import (
"html/template"
"mjpclab.dev/ghfs/src/i18n"
"mjpclab.dev/ghfs/src/util"
"net/http"
"os"
"path"
"strings"
)
type pathEntry struct {
Name string `json:"name"`
Path string `json:"path"`
}
type itemHtml struct {
Type template.HTML
Url string
DisplayName template.HTML
DisplaySize template.HTML
DisplayTime template.HTML
DeleteUrl string
}
type responseData struct {
prefixReqPath string
rawReqPath string
handlerReqPath string
NeedAuth bool
AuthUserName string
AuthSuccess bool
RestrictAccess bool
AllowAccess bool
Headers [][2]string
IsDownload bool
IsDownloadFile bool
IsUpload bool
IsMkdir bool
IsDelete bool
IsMutate bool
WantJson bool
CanUpload bool
CanMkdir bool
CanDelete bool
HasDeletable bool
CanArchive bool
CanCors bool
errors []error
Status int
IsRoot bool
Path string
Paths []pathEntry
RootRelPath string
File *os.File
Item os.FileInfo
ItemName string
SubItems []os.FileInfo
AliasSubItems []os.FileInfo
SubItemsHtml []itemHtml
SubItemPrefix string
SortState SortState
Context pathContext
NeedDirSlashRedirect bool
Lang string
Trans *i18n.Translation
}
func getPathEntries(currDirRelPath, path string, tailSlash bool) []pathEntry {
pathSegs := make([]string, 1, 12)
pathSegs[0] = "/"
for refPath := path[1:]; len(refPath) > 0; {
slashIndex := strings.IndexByte(refPath, '/')
if slashIndex < 0 {
pathSegs = append(pathSegs, refPath)
break
} else {
pathSegs = append(pathSegs, refPath[:slashIndex])
refPath = refPath[slashIndex+1:]
}
}
pathCount := len(pathSegs)
pathDepth := pathCount
if !tailSlash {
pathDepth--
}
pathEntries := make([]pathEntry, pathCount)
for n := 1; n <= pathCount; n++ {
var relPath string
if n < pathDepth {
relPath = strings.Repeat("../", pathDepth-n)
} else if n == pathDepth {
relPath = currDirRelPath
} else /*if n == pathDepth+1*/ {
relPath = currDirRelPath + pathSegs[pathDepth] + "/"
}
i := n - 1
pathEntries[i] = pathEntry{
Name: pathSegs[i],
Path: relPath,
}
}
return pathEntries
}
func stat(reqFsPath string, visitFs bool) (file *os.File, item os.FileInfo, err error) {
if !visitFs {
return
}
file, err = os.Open(reqFsPath)
if err != nil {
return
}
item, err = file.Stat()
if err != nil {
return
}
return
}
func readdir(file *os.File, item os.FileInfo, visitFs bool) (subItems []os.FileInfo, err error) {
if !visitFs || file == nil || item == nil || !item.IsDir() {
return
}
return file.Readdir(0)
}
func (h *aliasHandler) mergeAlias(
rawRequestPath string,
item os.FileInfo,
subItems []os.FileInfo,
doMerge bool,
) (mergedSubItems, aliasSubItems []os.FileInfo, errs []error) {
if !doMerge || (item != nil && !item.IsDir()) || len(h.aliases) == 0 {
return subItems, nil, errs
}
for _, alias := range h.aliases {
subName, noMore, ok := alias.nextPartOf(rawRequestPath)
if !ok {
continue
}
var fsItem os.FileInfo
if noMore { // reached second-deepest path of alias
var err error
fsItem, err = os.Stat(alias.fs)
if err != nil {
errs = append(errs, err)
}
}
matchExisted := false
for i, subItem := range subItems {
if !util.IsPathEqual(subItem.Name(), subName) {
continue
}
matchExisted = true
if isVirtual(subItem) {
continue
}
aliasSubItem := createVirtualFileInfo(subItem.Name(), fsItem)
aliasSubItems = append(aliasSubItems, aliasSubItem)
subItems[i] = aliasSubItem
break
}
if !matchExisted {
// fsItem could be nil
aliasSubItem := createVirtualFileInfo(subName, fsItem)
aliasSubItems = append(aliasSubItems, aliasSubItem)
subItems = append(subItems, aliasSubItem)
}
}
return subItems, aliasSubItems, errs
}
func getCurrDirRelPath(reqPath, prefixReqPath string) string {
if len(reqPath) == 1 && len(prefixReqPath) > 1 && prefixReqPath[len(prefixReqPath)-1] != '/' {
return "./" + path.Base(prefixReqPath) + "/"
} else {
return "./"
}
}
func getSubItemPrefix(currDirRelPath, rawRequestPath string, tailSlash bool) string {
if tailSlash {
return currDirRelPath
} else {
return currDirRelPath + path.Base(rawRequestPath) + "/"
}
}
func getItemName(info os.FileInfo, r *http.Request) (itemName string) {
if info != nil {
itemName = info.Name()
}
if len(itemName) == 0 || itemName == "." || itemName == "/" {
itemName = strings.Replace(r.Host, ":", "_", -1)
}
return
}
func getStatusByErr(err error) int {
switch {
case os.IsPermission(err):
return http.StatusForbidden
case os.IsNotExist(err):
return http.StatusNotFound
case err != nil:
return http.StatusInternalServerError
default:
return http.StatusOK
}
}
func (h *aliasHandler) statIndexFile(rawReqPath, baseDir string, baseItem os.FileInfo, doStat bool) (file *os.File, item os.FileInfo, err error) {
if !doStat || len(h.dirIndexes) == 0 {
return
}
for _, index := range h.dirIndexes {
for _, alias := range h.aliases {
if !alias.isMatch(path.Clean(rawReqPath + "/" + index)) {
continue
}
file, item, err = stat(alias.fs, true)
if err != nil && file != nil {
file.Close()
}
if err != nil && os.IsNotExist(err) {
continue
} else {
return
}
}
}
if baseItem == nil || !baseItem.IsDir() || h.emptyRoot {
return
}
for _, index := range h.dirIndexes {
file, item, err = stat(path.Clean(baseDir+"/"+index), true)
if err != nil && file != nil {
file.Close()
}
if err != nil && os.IsNotExist(err) {
continue
} else {
return
}
}
return nil, nil, nil
}
func dereferenceSymbolLinks(reqFsPath string, subItems []os.FileInfo) (errs []error) {
baseFsPath := reqFsPath + "/"
for i := range subItems {
if subItems[i].Mode()&os.ModeSymlink != 0 {
dereferencedItem, err := os.Stat(baseFsPath + subItems[i].Name())
if err != nil {
errs = append(errs, err)
} else {
subItems[i] = dereferencedItem
}
}
}
return
}
func (h *aliasHandler) getResponseData(r *http.Request) (data *responseData, fsPath string) {
var errs []error
prefixReqPath := r.URL.RawPath // init by pathTransformHandler
rawReqPath := r.URL.Path
tailSlash := rawReqPath[len(rawReqPath)-1] == '/'
reqPath := util.CleanUrlPath(rawReqPath[len(h.aliasPrefix):])
reqFsPath, _ := util.NormalizeFsPath(h.root + reqPath)
status := http.StatusOK
needAuth := h.getNeedAuth(rawReqPath, reqFsPath)
authUserName := ""
authSuccess := true
if needAuth {
var _authErr error
authUserName, authSuccess, _authErr = h.verifyAuth(r)
if _authErr != nil {
errs = append(errs, _authErr)
}
if !authSuccess {
status = http.StatusUnauthorized
}
}
headers := h.getHeaders(rawReqPath, reqFsPath, authSuccess)
rawQuery := r.URL.RawQuery
isDownload := false
isDownloadFile := false
isUpload := false
isMkdir := false
isDelete := false
isMutate := false
switch {
case strings.HasPrefix(rawQuery, "downloadfile"):
isDownload = true
isDownloadFile = true
case strings.HasPrefix(rawQuery, "download"):
isDownload = true
case strings.HasPrefix(rawQuery, "upload") && r.Method == http.MethodPost:
isUpload = true
isMutate = true
case strings.HasPrefix(rawQuery, "mkdir"):
isMkdir = true
isMutate = true
case strings.HasPrefix(r.URL.RawQuery, "delete"):
isDelete = true
isMutate = true
}
wantJson := strings.HasPrefix(rawQuery, "json") || strings.Contains(rawQuery, "&json")
isRoot := rawReqPath == "/"
currDirRelPath := getCurrDirRelPath(rawReqPath, prefixReqPath)
pathEntries := getPathEntries(currDirRelPath, rawReqPath, tailSlash)
var rootRelPath string
if len(pathEntries) > 0 {
rootRelPath = pathEntries[0].Path
} else {
rootRelPath = currDirRelPath
}
file, item, _statErr := stat(reqFsPath, authSuccess && !h.emptyRoot)
if _statErr != nil {
errs = append(errs, _statErr)
status = getStatusByErr(_statErr)
}
needDirSlashRedirect := h.forceDirSlash > 0 && prefixReqPath[len(prefixReqPath)-1] != '/' && item != nil && item.IsDir()
indexFile, indexItem, _statIdxErr := h.statIndexFile(rawReqPath, reqFsPath, item, authSuccess && !needDirSlashRedirect)
if _statIdxErr != nil {
errs = append(errs, _statIdxErr)
status = getStatusByErr(_statIdxErr)
} else if indexFile != nil {
if indexItem != nil {
file.Close()
file = indexFile
item = indexItem
} else {
indexFile.Close()
}
}
allowAccess := h.isAllowAccess(r, rawReqPath, reqFsPath, file, item)
if !allowAccess {
status = http.StatusForbidden
}
itemName := getItemName(item, r)
subItems, _readdirErr := readdir(file, item, authSuccess && !isMutate && !needDirSlashRedirect && allowAccess && NeedResponseBody(r.Method))
if _readdirErr != nil {
errs = append(errs, _readdirErr)
status = http.StatusInternalServerError
}
subItems, aliasSubItems, _mergeErrs := h.mergeAlias(rawReqPath, item, subItems, authSuccess && !needDirSlashRedirect && allowAccess)
if len(_mergeErrs) > 0 {
errs = append(errs, _mergeErrs...)
status = http.StatusInternalServerError
}
_dereferenceErrs := dereferenceSymbolLinks(reqFsPath, subItems)
if len(_dereferenceErrs) > 0 {
errs = append(errs, _dereferenceErrs...)
}
// update `needDirSlashRedirect` for dangling intermediate alias directory
if !needDirSlashRedirect && h.forceDirSlash > 0 && len(subItems) > 0 && prefixReqPath[len(prefixReqPath)-1] != '/' {
needDirSlashRedirect = true
}
subItems = h.FilterItems(subItems)
rawSortBy, sortState := sortInfos(subItems, rawQuery, h.defaultSort)
if h.emptyRoot && status == http.StatusOK && len(rawReqPath) > 1 {
status = http.StatusNotFound
}
subItemPrefix := getSubItemPrefix(currDirRelPath, rawReqPath, tailSlash)
canUpload := h.getCanUpload(item, rawReqPath, reqFsPath)
canMkdir := h.getCanMkdir(item, rawReqPath, reqFsPath)
canDelete := h.getCanDelete(item, rawReqPath, reqFsPath)
hasDeletable := canDelete && len(subItems) > len(aliasSubItems)
canArchive := h.getCanArchive(subItems, rawReqPath, reqFsPath)
canCors := h.getCanCors(rawReqPath, reqFsPath)
context := pathContext{
download: isDownload,
downloadfile: isDownloadFile,
sort: rawSortBy,
defaultSort: h.defaultSort,
}
return &responseData{
prefixReqPath: prefixReqPath,
rawReqPath: rawReqPath,
handlerReqPath: reqPath,
NeedAuth: needAuth,
AuthUserName: authUserName,
AuthSuccess: authSuccess,
RestrictAccess: h.restrictAccess,
AllowAccess: allowAccess,
Headers: headers,
IsDownload: isDownload,
IsDownloadFile: isDownloadFile,
IsUpload: isUpload,
IsMkdir: isMkdir,
IsDelete: isDelete,
IsMutate: isMutate,
WantJson: wantJson,
CanUpload: canUpload,
CanMkdir: canMkdir,
CanDelete: canDelete,
HasDeletable: hasDeletable,
CanArchive: canArchive,
CanCors: canCors,
errors: errs,
Status: status,
IsRoot: isRoot,
Path: rawReqPath,
Paths: pathEntries,
RootRelPath: rootRelPath,
File: file,
Item: item,
ItemName: itemName,
SubItems: subItems,
AliasSubItems: aliasSubItems,
SubItemsHtml: nil,
SubItemPrefix: subItemPrefix,
SortState: sortState,
Context: context,
NeedDirSlashRedirect: needDirSlashRedirect,
}, reqFsPath
}