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statics.go
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statics.go
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/*
* Copyright (c) 2019-2021. Abstrium SAS <team (at) pydio.com>
* This file is part of Pydio Cells.
*
* Pydio Cells is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Pydio Cells is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with Pydio Cells. If not, see <http://www.gnu.org/licenses/>.
*
* The latest code can be found at <https://pydio.com>.
*/
package statics
import (
"embed"
"fmt"
"io/fs"
"net/http"
"os"
"path/filepath"
"runtime"
"strings"
)
type FS interface {
fs.FS
List() []string
}
// PackrBox avoids pulling in the packr library for everyone, mimicks the bits of
// packr.Box that we need.
type PackrBox interface {
List() []string
Open(name string) (http.File, error)
}
type packrFS struct {
box PackrBox
}
func (p *packrFS) Open(name string) (fs.File, error) {
return p.box.Open(name)
}
func (p *packrFS) List() []string {
return p.box.List()
}
type embedFS struct {
fs.FS
}
func (e *embedFS) List() []string {
var output []string
_ = fs.WalkDir(e.FS, ".", func(path string, d fs.DirEntry, err error) error {
if path != "." {
output = append(output, path)
}
return nil
})
return output
}
type httpFS struct {
http.FileSystem
}
func (h httpFS) Open(name string) (fs.File, error) {
return h.FileSystem.Open(name)
}
func (h httpFS) List() []string {
return []string{}
}
func AsFS(box interface{}, sub ...string) FS {
if pb, ok := box.(PackrBox); ok {
return &packrFS{box: pb}
} else if efs, ok2 := box.(embed.FS); ok2 {
if len(sub) > 0 {
f, _ := fs.Sub(efs, sub[0])
return &embedFS{FS: f}
} else {
return &embedFS{FS: efs}
}
} else if f, ok3 := box.(fs.FS); ok3 {
if len(sub) > 0 {
f, _ = fs.Sub(f, sub[0])
}
return &embedFS{FS: f}
} else if hf, ok4 := box.(http.FileSystem); ok4 {
return &httpFS{FileSystem: hf}
} else {
fmt.Println("Calling AsFS on unknown type, returning empty embedFS", box)
empty := embed.FS{}
return &embedFS{FS: empty}
}
}
// AssetsLocalDir returns the location of the assets if they physically exist
func AssetsLocalDir(path string) (string, error) {
var cd string
if !filepath.IsAbs(path) {
_, filename, _, _ := runtime.Caller(1)
cd = filepath.Dir(filename)
}
// this little hack courtesy of the `-cover` flag!!
cov := filepath.Join("_test", "_obj_test")
cd = strings.Replace(cd, string(filepath.Separator)+cov, "", 1)
if !filepath.IsAbs(cd) && cd != "" {
cd = filepath.Join(os.Getenv("GOPATH"), "src", cd)
}
if _, err := os.Stat(cd); os.IsNotExist(err) {
return "", err
}
return filepath.Join(cd, path), nil
}