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|
package fs
import (
"io/fs"
"mime"
"strings"
sr "tildegit.org/tjp/sliderule"
)
// ResolveFile finds a file from a filesystem based on a request path.
//
// It only returns a non-nil file if a file is found - not a directory.
// If there is any other sort of filesystem access error, it will be
// returned.
func ResolveFile(request *sr.Request, fileSystem fs.FS) (string, fs.File, error) {
filepath := strings.TrimPrefix(request.Path, "/")
file, err := fileSystem.Open(filepath)
if isNotFound(err) {
return "", nil, nil
}
if err != nil {
return "", nil, err
}
isDir, err := fileIsDir(file)
if err != nil {
_ = file.Close()
return "", nil, err
}
if isDir {
_ = file.Close()
return "", nil, nil
}
return filepath, file, nil
}
func mediaType(filePath string) string {
if strings.HasSuffix(filePath, ".gmi") {
// This may not be present in the listings searched by mime.TypeByExtension,
// so provide a dedicated fast path for it here.
return "text/gemini"
}
slashIdx := strings.LastIndex(filePath, "/")
dotIdx := strings.LastIndex(filePath[slashIdx+1:], ".")
if dotIdx == -1 {
return "application/octet-stream"
}
ext := filePath[slashIdx+1+dotIdx:]
mtype := mime.TypeByExtension(ext)
if mtype == "" {
return "application/octet-stream"
}
return mtype
}
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