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directory.go
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directory.go
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/*
Copyright © 2023 Bartłomiej Święcki (byo)
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package uploader
import (
"bytes"
"context"
"errors"
"fmt"
"html/template"
"io/fs"
"path"
_ "embed"
"github.com/cinode/go/pkg/blenc"
"github.com/cinode/go/pkg/cinodefs"
"github.com/cinode/go/pkg/utilities/golang"
"golang.org/x/exp/slog"
)
const (
CinodeDirMimeType = "application/cinode-dir"
)
var (
ErrNotFound = blenc.ErrNotFound
ErrNotADirectory = errors.New("entry is not a directory")
ErrNotAFile = errors.New("entry is not a file")
ErrNotADirectoryOrAFile = errors.New("entry is neither a directory nor a regular file")
)
func UploadStaticDirectory(
ctx context.Context,
fsys fs.FS,
cfs cinodefs.FS,
opts ...Option,
) error {
c := dirCompiler{
ctx: ctx,
fsys: fsys,
cfs: cfs,
log: slog.Default(),
}
for _, opt := range opts {
opt(&c)
}
_, err := c.compilePath(ctx, ".", c.basePath)
if err != nil {
return err
}
return nil
}
type Option func(d *dirCompiler)
func BasePath(path ...string) Option {
return Option(func(d *dirCompiler) {
d.basePath = path
})
}
func CreateIndexFile(indexFile string) Option {
return Option(func(d *dirCompiler) {
d.createIndexFile = true
d.indexFileName = indexFile
})
}
type dirCompiler struct {
ctx context.Context
fsys fs.FS
cfs cinodefs.FS
log *slog.Logger
basePath []string
createIndexFile bool
indexFileName string
}
type dirEntry struct {
Name string
MimeType string
IsDir bool
Size int64
}
func (d *dirCompiler) compilePath(
ctx context.Context,
srcPath string,
destPath []string,
) (*dirEntry, error) {
st, err := fs.Stat(d.fsys, srcPath)
if err != nil {
d.log.ErrorCtx(ctx, "failed to stat path", "path", srcPath, "err", err)
return nil, fmt.Errorf("couldn't check path: %w", err)
}
var name string
if len(destPath) > 0 {
name = destPath[len(destPath)-1]
}
if st.IsDir() {
size, err := d.compileDir(ctx, srcPath, destPath)
if err != nil {
return nil, err
}
return &dirEntry{
Name: name,
MimeType: cinodefs.CinodeDirMimeType,
IsDir: true,
Size: int64(size),
}, nil
}
if st.Mode().IsRegular() {
mime, err := d.compileFile(ctx, srcPath, destPath)
if err != nil {
return nil, err
}
return &dirEntry{
Name: name,
MimeType: mime,
IsDir: false,
Size: st.Size(),
}, nil
}
d.log.ErrorContext(ctx, "path is neither dir nor a regular file", "path", srcPath)
return nil, fmt.Errorf("%w: %v", ErrNotADirectoryOrAFile, srcPath)
}
func (d *dirCompiler) compileFile(ctx context.Context, srcPath string, dstPath []string) (string, error) {
d.log.InfoContext(ctx, "compiling file", "path", srcPath)
fl, err := d.fsys.Open(srcPath)
if err != nil {
d.log.ErrorContext(ctx, "failed to open file", "path", srcPath, "err", err)
return "", fmt.Errorf("couldn't open file %v: %w", srcPath, err)
}
defer fl.Close()
ep, err := d.cfs.SetEntryFile(ctx, dstPath, fl)
if err != nil {
return "", fmt.Errorf("failed to upload file %v: %w", srcPath, err)
}
return ep.MimeType(), nil
}
func (d *dirCompiler) compileDir(ctx context.Context, srcPath string, dstPath []string) (int, error) {
fileList, err := fs.ReadDir(d.fsys, srcPath)
if err != nil {
d.log.ErrorContext(ctx, "couldn't read contents of dir", "path", srcPath, "err", err)
return 0, fmt.Errorf("couldn't read contents of dir %v: %w", srcPath, err)
}
entries := make([]*dirEntry, 0, len(fileList))
hasIndex := false
for _, e := range fileList {
entry, err := d.compilePath(
ctx,
path.Join(srcPath, e.Name()),
append(dstPath, e.Name()),
)
if err != nil {
return 0, err
}
if entry.Name == d.indexFileName {
hasIndex = true
} else {
entries = append(entries, entry)
}
}
if d.createIndexFile && !hasIndex {
buf := bytes.NewBuffer(nil)
err = dirIndexTemplate.Execute(buf, map[string]any{
"entries": entries,
"indexName": d.indexFileName,
})
golang.Assert(err == nil, "template execution must not fail")
_, err = d.cfs.SetEntryFile(ctx,
append(dstPath, d.indexFileName),
bytes.NewReader(buf.Bytes()),
)
if err != nil {
return 0, err
}
}
return len(fileList), nil
}
//go:embed templates/dir.html
var _dirIndexTemplateStr string
var dirIndexTemplate = golang.Must(
template.
New("dir").
Parse(_dirIndexTemplateStr),
)