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package fs
import (
"context"
"os"
"path/filepath"
"slices"
"strings"
sr "tildegit.org/tjp/sliderule"
"tildegit.org/tjp/sliderule/gopher"
"tildegit.org/tjp/sliderule/gopher/gophermap"
)
// GopherFileHandler builds a handler which serves up files from a file system.
//
// It only serves responses for paths which correspond to files, not directories.
func GopherFileHandler(fsroot, urlroot string, settings *gophermap.FileSystemSettings) sr.Handler {
fsroot = strings.TrimRight(fsroot, "/")
return sr.HandlerFunc(func(ctx context.Context, request *sr.Request) *sr.Response {
if !strings.HasPrefix(request.Path, urlroot) {
return nil
}
requestpath := strings.Trim(strings.TrimPrefix(request.Path, urlroot), "/")
path := filepath.Join(fsroot, requestpath)
if isPrivate(path) {
return nil
}
if isf, err := isFile(path); err != nil {
return gopher.Error(err).Response()
} else if !isf {
return nil
}
if settings == nil {
settings = &gophermap.FileSystemSettings{}
}
file, err := os.Open(path)
if err != nil {
return gopher.Error(err).Response()
}
if !(settings.ParseExtended && isMap(path, *settings)) {
return gopher.File(gopher.GuessItemType(path), file)
}
defer func() { _ = file.Close() }()
edoc, err := gophermap.ParseExtended(file, request.URL)
if err != nil {
return gopher.Error(err).Response()
}
doc, _, err := edoc.Compatible(filepath.Dir(path), *settings)
if err != nil {
return gopher.Error(err).Response()
}
return doc.Response()
})
}
// GopherDirectoryDefault serves up default files for directory path requests.
//
// If any of the supported filenames are found in the requested directory, the
// contents of that file is returned as the gopher response.
//
// It returns nil for any paths which don't correspond to a directory.
func GopherDirectoryDefault(fsroot, urlroot string, settings *gophermap.FileSystemSettings) sr.Handler {
fsroot = strings.TrimRight(fsroot, "/")
return sr.HandlerFunc(func(ctx context.Context, request *sr.Request) *sr.Response {
if !strings.HasPrefix(request.Path, urlroot) {
return nil
}
requestpath := strings.Trim(strings.TrimPrefix(request.Path, urlroot), "/")
path := filepath.Join(fsroot, requestpath)
if isPrivate(path) {
return nil
}
if isd, err := isDir(path); err != nil {
return gopher.Error(err).Response()
} else if !isd {
return nil
}
if settings == nil {
settings = &gophermap.FileSystemSettings{}
}
for _, fname := range settings.DirMaps {
fpath := filepath.Join(path, fname)
if isf, err := isFile(fpath); err != nil {
return gopher.Error(err).Response()
} else if !isf {
continue
}
file, err := os.Open(fpath)
if err != nil {
return gopher.Error(err).Response()
}
if settings.ParseExtended {
defer func() { _ = file.Close() }()
edoc, err := gophermap.ParseExtended(file, request.URL)
if err != nil {
return gopher.Error(err).Response()
}
doc, _, err := edoc.Compatible(path, *settings)
if err != nil {
return gopher.Error(err).Response()
}
return doc.Response()
} else {
return gopher.File(gopher.MenuType, file)
}
}
return nil
})
}
// GopherDirectoryListing produces a listing of the contents of any requested directories.
//
// It returns nil for any paths which don't correspond to a filesystem directory.
func GopherDirectoryListing(fsroot, urlroot string, settings *gophermap.FileSystemSettings) sr.Handler {
fsroot = strings.TrimRight(fsroot, "/")
return sr.HandlerFunc(func(ctx context.Context, request *sr.Request) *sr.Response {
if !strings.HasPrefix(request.Path, urlroot) {
return nil
}
requestpath := strings.Trim(strings.TrimPrefix(request.Path, urlroot), "/")
path := filepath.Join(fsroot, requestpath)
if isPrivate(path) {
return nil
}
if isd, err := isDir(path); err != nil {
return gopher.Error(err).Response()
} else if !isd {
return nil
}
if settings == nil {
settings = &gophermap.FileSystemSettings{}
}
doc, err := gophermap.ListDir(path, request.URL, *settings)
if err != nil {
return gopher.Error(err).Response()
}
return doc.Response()
})
}
func isDir(path string) (bool, error) {
info, err := os.Stat(path)
if err != nil {
if isNotFound(err) {
err = nil
}
return false, err
}
return info.IsDir() && info.Mode()&4 == 4, nil
}
func isFile(path string) (bool, error) {
info, err := os.Stat(path)
if err != nil {
if isNotFound(err) {
err = nil
}
return false, err
}
m := info.Mode()
return m.IsRegular() && m&4 == 4, nil
}
func isMap(path string, settings gophermap.FileSystemSettings) bool {
base := filepath.Base(path)
if base == "gophermap" || strings.HasSuffix(base, ".gph") || strings.HasSuffix(base, ".gophermap") {
return true
}
return slices.Contains(settings.DirMaps, filepath.Base(path))
}
|
