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archive.go
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archive.go
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package serverHandler
import (
"mjpclab.dev/ghfs/src/util"
"net/http"
"net/url"
"os"
"path"
"strings"
)
type archiveCallback func(f *os.File, fInfo os.FileInfo, relPath string) error
func matchSelection(info os.FileInfo, selections []string) (matchName, matchPrefix bool, childSelections []string) {
if len(selections) == 0 {
return true, false, nil
}
name := info.Name()
for _, selName := range selections {
if util.IsPathEqual(selName, name) {
matchName = true
continue
}
slashIndex := strings.IndexByte(selName, '/')
if slashIndex <= 0 {
continue
}
selNamePart1 := selName[:slashIndex]
if util.IsPathEqual(selNamePart1, name) {
childSel := selName[slashIndex+1:]
if len(childSel) > 0 {
matchPrefix = true
childSelections = append(childSelections, childSel)
}
continue
}
}
return
}
func (h *aliasHandler) visitTreeNode(
fsPath, rawReqPath, relPath string,
statNode bool,
childSelections []string,
archiveCallback archiveCallback,
) {
var fInfo os.FileInfo
var childInfos []os.FileInfo
// wrap func to run defer ASAP
err := func() error {
var f *os.File
var err error
if statNode {
f, err = os.Open(fsPath)
if f != nil {
defer f.Close()
}
if h.logError(err) {
if os.IsExist(err) {
return err
}
fInfo = createPlaceholderFileInfo(path.Base(fsPath), true) // prefix path for alias
} else {
fInfo, err = f.Stat()
if h.logError(err) {
return err
}
}
} else {
fInfo = createPlaceholderFileInfo(path.Base(fsPath), true)
}
if len(relPath) > 0 {
if err := archiveCallback(f, fInfo, relPath); err != nil {
return err
}
}
if f != nil && fInfo.IsDir() {
childInfos, err = f.Readdir(0)
if h.logError(err) {
return err
}
}
return nil
}()
if err != nil {
return
}
if fInfo.IsDir() {
childInfos, _, _ := h.mergeAlias(rawReqPath, fInfo, childInfos, true)
childInfos = h.FilterItems(childInfos)
// childInfo can be regular dir/file, or aliased item that shadows regular dir/file
for _, childInfo := range childInfos {
matchChildName, matchChildPrefix, childChildSelections := matchSelection(childInfo, childSelections)
if !matchChildName && !matchChildPrefix {
continue
}
childPath := "/" + childInfo.Name()
childFsPath := fsPath + childPath
childRawReqPath := util.CleanUrlPath(rawReqPath + childPath)
childRelPath := relPath + childPath
if childAlias, hasChildAlias := h.aliases.byUrlPath(childRawReqPath); hasChildAlias {
h.visitTreeNode(childAlias.fs, childRawReqPath, childRelPath, true, childChildSelections, archiveCallback)
} else {
h.visitTreeNode(childFsPath, childRawReqPath, childRelPath, statNode, childChildSelections, archiveCallback)
}
}
}
}
func (h *aliasHandler) archive(
w http.ResponseWriter,
r *http.Request,
pageData *responseData,
selections []string,
fileSuffix string,
contentType string,
cbWriteFile archiveCallback,
) {
var itemName string
_, hasAlias := h.aliases.byUrlPath(pageData.rawReqPath)
if hasAlias {
itemName = path.Base(pageData.rawReqPath)
}
if len(itemName) == 0 || itemName == "/" {
itemName = pageData.ItemName
}
targetFilename := itemName + fileSuffix
writeArchiveHeader(w, contentType, targetFilename)
if !NeedResponseBody(r.Method) {
return
}
h.visitTreeNode(
path.Clean(h.root+pageData.handlerReqPath),
pageData.rawReqPath,
"",
pageData.Item != nil, // not empty root
selections,
func(f *os.File, fInfo os.FileInfo, relPath string) error {
h.logArchive(targetFilename, relPath, r)
err := cbWriteFile(f, fInfo, relPath)
h.logError(err)
return err
},
)
}
func writeArchiveHeader(w http.ResponseWriter, contentType, filename string) {
filename = url.PathEscape(filename)
header := w.Header()
header.Set("Content-Type", contentType)
header.Set("Content-Disposition", "attachment; filename*=UTF-8''"+filename)
header.Set("Cache-Control", "public, max-age=0")
w.WriteHeader(http.StatusOK)
}
func (h *aliasHandler) normalizeArchiveSelections(r *http.Request) ([]string, bool) {
if h.logError(r.ParseForm()) {
return nil, false
}
inputs := r.Form["name"]
if len(inputs) == 0 {
return nil, true
}
count := len(inputs)
selections := make([]string, count)
for i := 0; i < count; i++ {
var ok bool
selections[i], ok = getCleanDirFilePath(inputs[i])
if !ok {
h.logger.LogErrorString("archive: illegal path " + inputs[i])
return nil, false
}
}
return selections, true
}