github.com/readium/readium-lcp-server@v0.0.0-20240101192032-6e95190e99f1/storage/fs.go (about)

     1  // Copyright (c) 2016 Readium Foundation
     2  //
     3  // Redistribution and use in source and binary forms, with or without modification,
     4  // are permitted provided that the following conditions are met:
     5  //
     6  // 1. Redistributions of source code must retain the above copyright notice, this
     7  //    list of conditions and the following disclaimer.
     8  // 2. Redistributions in binary form must reproduce the above copyright notice,
     9  //    this list of conditions and the following disclaimer in the documentation and/or
    10  //    other materials provided with the distribution.
    11  // 3. Neither the name of the organization nor the names of its contributors may be
    12  //    used to endorse or promote products derived from this software without specific
    13  //    prior written permission
    14  //
    15  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
    16  // ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
    17  // WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
    18  // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
    19  // ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
    20  // (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
    21  // LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
    22  // ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    23  // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
    24  // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    25  
    26  package storage
    27  
    28  import (
    29  	"io"
    30  	"io/ioutil"
    31  	"os"
    32  	"path/filepath"
    33  )
    34  
    35  type fsStorage struct {
    36  	fspath string
    37  	url    string
    38  }
    39  
    40  type fsItem struct {
    41  	name       string
    42  	storageDir string
    43  	baseURL    string
    44  }
    45  
    46  func (i fsItem) Key() string {
    47  	return i.name
    48  }
    49  
    50  func (i fsItem) PublicURL() string {
    51  	return i.baseURL + "/" + i.name
    52  }
    53  
    54  func (i fsItem) Contents() (io.ReadCloser, error) {
    55  	return os.Open(filepath.Join(i.storageDir, i.name))
    56  }
    57  
    58  func (s fsStorage) Add(key string, r io.ReadSeeker) (Item, error) {
    59  	file, err := os.Create(filepath.Join(s.fspath, key))
    60  	if err != nil {
    61  		return nil, err
    62  	}
    63  	defer file.Close()
    64  	io.Copy(file, r)
    65  
    66  	if err != nil {
    67  		return nil, err
    68  	}
    69  	return &fsItem{name: key, storageDir: s.fspath, baseURL: s.url}, nil
    70  }
    71  
    72  // Get returns an Item in the storage, by its key
    73  // the key is the file name
    74  //
    75  func (s fsStorage) Get(key string) (Item, error) {
    76  	_, err := os.Stat(filepath.Join(s.fspath, key))
    77  	if err != nil {
    78  		if os.IsNotExist(err) {
    79  			return nil, ErrNotFound
    80  		}
    81  		return nil, err
    82  	}
    83  	return &fsItem{name: key, storageDir: s.fspath, baseURL: s.url}, nil
    84  }
    85  
    86  func (s fsStorage) Remove(key string) error {
    87  	return os.Remove(filepath.Join(s.fspath, key))
    88  }
    89  
    90  func (s fsStorage) List() ([]Item, error) {
    91  	var items []Item
    92  
    93  	files, err := ioutil.ReadDir(s.fspath)
    94  	if err != nil {
    95  		return nil, err
    96  	}
    97  
    98  	for _, fi := range files {
    99  		items = append(items, &fsItem{name: fi.Name(), storageDir: s.fspath, baseURL: s.url})
   100  	}
   101  
   102  	return items, nil
   103  }
   104  
   105  // NewFileSystem creates a new storage
   106  //
   107  func NewFileSystem(dir, basePath string) Store {
   108  	return fsStorage{dir, basePath}
   109  }