/
file.go
221 lines (193 loc) · 4.85 KB
/
file.go
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package wtf
import (
"bytes"
"io"
"mime"
"net/http"
"os"
"path/filepath"
)
type (
File interface {
io.Reader
io.Writer
io.Seeker
io.Closer
FileInfo() os.FileInfo
ContentType() string
}
FileSystem interface {
SetFileMapper(m func(Request) []string)
SetDefaultPages([]string)
Open(Request, ...int) (File, Error)
OpenPath(string, ...int) (File, Error)
Read(Request) ([]byte, Error)
Write([]byte, Request) Error
WriteStream(io.Reader, Request) Error
Append([]byte, Request) Error
AppendStream(io.Reader, Request) Error
}
wtf_file_server struct {
fs FileSystem
def_pages []string
}
wtf_file struct {
file *os.File
fi os.FileInfo
ct string
}
wtf_file_system struct {
mapper func(Request) []string
def_pages []string
}
)
func (f *wtf_file) Read(p []byte) (int, error) {
return f.file.Read(p)
}
func (f *wtf_file) Write(p []byte) (int, error) {
return f.file.Write(p)
}
func (f *wtf_file) Seek(offset int64, whence int) (int64, error) {
return f.file.Seek(offset, whence)
}
func (f *wtf_file) Close() error {
return f.file.Close()
}
func (f *wtf_file) FileInfo() os.FileInfo {
return f.fi
}
func (f *wtf_file) ContentType() string {
return f.ct
}
func (f *wtf_file) check_content_type() {
if f.ct == "" {
ext := filepath.Ext(f.fi.Name())
f.ct = mime.TypeByExtension(ext)
if f.ct == "" {
var buf [512]byte
n, _ := io.ReadFull(f.file, buf[:])
f.ct = http.DetectContentType(buf[:n])
f.file.Seek(0, io.SeekStart)
}
}
}
func NewFileSystem(base ...string) FileSystem {
p := "."
if len(base) > 0 {
p = base[0]
}
return &wtf_file_system{func(r Request) []string {
path := p + r.URL().Path
return []string{path}
}, []string{}}
}
func (fs *wtf_file_system) SetFileMapper(m func(Request) []string) {
fs.mapper = m
}
func (fs *wtf_file_system) get_file_info(paths []string) (string, os.FileInfo, Error) {
var we Error
for _, path := range paths {
stat, err := os.Stat(path)
if err != nil {
we = NewError(http.StatusNotFound, err.Error(), err)
} else {
if stat.IsDir() {
for _, f := range fs.def_pages {
fn := path + "/" + f
fi, err := os.Stat(fn)
if err == nil {
return fn, fi, nil
}
}
we = NewError(http.StatusNotFound, "File Not Found")
} else {
return path, stat, nil
}
}
}
return "", nil, we
}
func (fs *wtf_file_system) SetDefaultPages(dp []string) {
fs.def_pages = dp
}
func (fs *wtf_file_system) open_file(paths []string, flags ...int) (File, Error) {
name, stat, werr := fs.get_file_info(paths)
if werr != nil {
return nil, werr
}
flag := os.O_RDONLY
if len(flags) > 0 {
flag = 0
for _, f := range flags {
flag |= f
}
}
file, err := os.OpenFile(name, flag, 0644)
if err != nil {
return nil, NewError(http.StatusInternalServerError, err.Error(), err)
}
ret := &wtf_file{file, stat, ""}
ret.check_content_type()
return ret, nil
}
func (fs *wtf_file_system) Open(req Request, flags ...int) (File, Error) {
paths := fs.mapper(req)
f, err := fs.open_file(paths, flags...)
if err != nil && err.Code() == http.StatusNotFound {
return nil, NewError(http.StatusNotFound, req.URL().Path+": no such file or directory", err)
}
return f, err
}
func (fs *wtf_file_system) OpenPath(path string, flags ...int) (File, Error) {
return fs.open_file([]string{path}, flags...)
}
func (fs *wtf_file_system) Read(req Request) ([]byte, Error) {
file, err := fs.Open(req)
if err != nil {
return nil, err
}
size := file.FileInfo().Size()
buf := make([]byte, size)
_, e := file.Read(buf)
if e != nil {
return nil, NewError(http.StatusInternalServerError, e.Error(), e)
}
return buf, nil
}
func (fs *wtf_file_system) write_stream(r io.Reader, req Request, flags int) Error {
file, err := fs.Open(req, flags)
if err != nil {
return err
}
_, e := io.Copy(file, r)
if e != nil {
return NewError(http.StatusInternalServerError, e.Error(), e)
}
return nil
}
func (fs *wtf_file_system) Write(d []byte, req Request) Error {
return fs.write_stream(bytes.NewReader(d), req, os.O_WRONLY|os.O_CREATE|os.O_TRUNC)
}
func (fs *wtf_file_system) WriteStream(r io.Reader, req Request) Error {
return fs.write_stream(r, req, os.O_WRONLY|os.O_CREATE|os.O_TRUNC)
}
func (fs *wtf_file_system) Append(d []byte, req Request) Error {
return fs.write_stream(bytes.NewReader(d), req, os.O_APPEND|os.O_WRONLY|os.O_CREATE)
}
func (fs *wtf_file_system) AppendStream(r io.Reader, req Request) Error {
return fs.write_stream(r, req, os.O_APPEND|os.O_WRONLY|os.O_CREATE)
}
func NewFileServer(root string) func(Context, Response) {
ret := &wtf_file_server{}
ret.def_pages = []string{"index.html", "index.htm"}
ret.fs = NewFileSystem(root)
ret.fs.SetDefaultPages(ret.def_pages)
return func(ctx Context, resp Response) {
file, err := ret.fs.Open(ctx.Request())
if err != nil {
resp.StatusCode(err.Code())
return
}
ctx.Response().WriteStream(file)
}
}