Gemini server
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2.9 KiB

package main
import (
"bytes"
"fmt"
"io"
"net"
"net/url"
"os"
"path/filepath"
"sort"
"github.com/h2non/filetype"
)
func buildDirList(request *url.URL, dirPath string) ([]byte, error) {
var (
b = &bytes.Buffer{}
files []os.FileInfo
numDirs int
numFiles int
)
err := filepath.Walk(dirPath, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
} else if path == dirPath {
return nil
}
files = append(files, info)
if info.IsDir() || info.Mode()&os.ModeSymlink != 0 {
numDirs++
} else {
numFiles++
}
if info.IsDir() {
return filepath.SkipDir
}
return nil
})
if err != nil {
return nil, err
}
// List directories first
sort.Slice(files, func(i, j int) bool {
iDir := files[i].IsDir() || files[i].Mode()&os.ModeSymlink != 0
jDir := files[j].IsDir() || files[j].Mode()&os.ModeSymlink != 0
if iDir != jDir {
return iDir
}
return i < j
})
fmt.Fprintf(b, "# %s%s", request.Path, newLine)
if numDirs == 1 {
b.Write([]byte("1 directory"))
} else {
fmt.Fprintf(b, "%d directories", numDirs)
}
b.Write([]byte(", "))
if numDirs == 1 {
b.Write([]byte("1 file"))
} else {
fmt.Fprintf(b, "%d files", numFiles)
}
b.Write([]byte(newLine + newLine))
if request.Path != "/" {
b.Write([]byte("=> ../ ../" + newLine + newLine))
}
for _, info := range files {
fileName := info.Name()
filePath := url.PathEscape(info.Name())
if info.IsDir() || info.Mode()&os.ModeSymlink != 0 {
fileName += "/"
filePath += "/"
}
b.Write([]byte("=> " + fileName + " " + filePath + newLine))
if info.IsDir() || info.Mode()&os.ModeSymlink != 0 {
b.Write([]byte(newLine))
continue
}
modified := "Never"
if !info.ModTime().IsZero() {
modified = info.ModTime().Format("2006-01-02 3:04 PM")
}
b.Write([]byte(modified + " - " + formatFileSize(info.Size()) + newLine + newLine))
}
return b.Bytes(), nil
}
func serveDirList(c net.Conn, serve *pathConfig, request *url.URL, dirPath string) int {
dirList, err := buildDirList(request, dirPath)
if err != nil {
return writeStatus(c, statusTemporaryFailure)
}
writeSuccess(c, serve, geminiType, -1)
c.Write(dirList)
return statusSuccess
}
func serveFile(c net.Conn, serve *pathConfig, filePath string) {
// Open file
file, _ := os.Open(filePath)
defer file.Close()
// Read content type
var (
buf = make([]byte, 261)
n int
)
contentType := config.Types[filepath.Ext(filePath)]
if contentType == "" {
n, _ = file.Read(buf)
kind, err := filetype.Match(buf[:n])
if err == nil && kind != filetype.Unknown && kind.MIME.Value != "" {
contentType = kind.MIME.Value
} else {
contentType = plainType
}
}
// Read file size
size := int64(-1)
info, err := file.Stat()
if err == nil {
size = info.Size()
}
// Write response header
writeSuccess(c, serve, contentType, size)
// Write file contents
if n > 0 {
c.Write(buf[:n])
}
io.Copy(c, file)
}