github.com/gojuno/afero@v1.1.1/regexpfs.go (about) 1 package afero 2 3 import ( 4 "os" 5 "regexp" 6 "syscall" 7 "time" 8 ) 9 10 // The RegexpFs filters files (not directories) by regular expression. Only 11 // files matching the given regexp will be allowed, all others get a ENOENT error ( 12 // "No such file or directory"). 13 // 14 type RegexpFs struct { 15 re *regexp.Regexp 16 source Fs 17 } 18 19 func NewRegexpFs(source Fs, re *regexp.Regexp) Fs { 20 return &RegexpFs{source: source, re: re} 21 } 22 23 type RegexpFile struct { 24 f File 25 re *regexp.Regexp 26 } 27 28 func (r *RegexpFs) matchesName(name string) error { 29 if r.re == nil { 30 return nil 31 } 32 if r.re.MatchString(name) { 33 return nil 34 } 35 return syscall.ENOENT 36 } 37 38 func (r *RegexpFs) dirOrMatches(name string) error { 39 dir, err := IsDir(r.source, name) 40 if err != nil { 41 return err 42 } 43 if dir { 44 return nil 45 } 46 return r.matchesName(name) 47 } 48 49 func (r *RegexpFs) Chtimes(name string, a, m time.Time) error { 50 if err := r.dirOrMatches(name); err != nil { 51 return err 52 } 53 return r.source.Chtimes(name, a, m) 54 } 55 56 func (r *RegexpFs) Chmod(name string, mode os.FileMode) error { 57 if err := r.dirOrMatches(name); err != nil { 58 return err 59 } 60 return r.source.Chmod(name, mode) 61 } 62 63 func (r *RegexpFs) Name() string { 64 return "RegexpFs" 65 } 66 67 func (r *RegexpFs) Stat(name string) (os.FileInfo, error) { 68 if err := r.dirOrMatches(name); err != nil { 69 return nil, err 70 } 71 return r.source.Stat(name) 72 } 73 74 func (r *RegexpFs) Rename(oldname, newname string) error { 75 dir, err := IsDir(r.source, oldname) 76 if err != nil { 77 return err 78 } 79 if dir { 80 return nil 81 } 82 if err := r.matchesName(oldname); err != nil { 83 return err 84 } 85 if err := r.matchesName(newname); err != nil { 86 return err 87 } 88 return r.source.Rename(oldname, newname) 89 } 90 91 func (r *RegexpFs) RemoveAll(p string) error { 92 dir, err := IsDir(r.source, p) 93 if err != nil { 94 return err 95 } 96 if !dir { 97 if err := r.matchesName(p); err != nil { 98 return err 99 } 100 } 101 return r.source.RemoveAll(p) 102 } 103 104 func (r *RegexpFs) Remove(name string) error { 105 if err := r.dirOrMatches(name); err != nil { 106 return err 107 } 108 return r.source.Remove(name) 109 } 110 111 func (r *RegexpFs) OpenFile(name string, flag int, perm os.FileMode) (File, error) { 112 if err := r.dirOrMatches(name); err != nil { 113 return nil, err 114 } 115 return r.source.OpenFile(name, flag, perm) 116 } 117 118 func (r *RegexpFs) Open(name string) (File, error) { 119 dir, err := IsDir(r.source, name) 120 if err != nil { 121 return nil, err 122 } 123 if !dir { 124 if err := r.matchesName(name); err != nil { 125 return nil, err 126 } 127 } 128 f, err := r.source.Open(name) 129 return &RegexpFile{f: f, re: r.re}, nil 130 } 131 132 func (r *RegexpFs) Mkdir(n string, p os.FileMode) error { 133 return r.source.Mkdir(n, p) 134 } 135 136 func (r *RegexpFs) MkdirAll(n string, p os.FileMode) error { 137 return r.source.MkdirAll(n, p) 138 } 139 140 func (r *RegexpFs) Create(name string) (File, error) { 141 if err := r.matchesName(name); err != nil { 142 return nil, err 143 } 144 return r.source.Create(name) 145 } 146 147 func (f *RegexpFile) Close() error { 148 return f.f.Close() 149 } 150 151 func (f *RegexpFile) Read(s []byte) (int, error) { 152 return f.f.Read(s) 153 } 154 155 func (f *RegexpFile) ReadAt(s []byte, o int64) (int, error) { 156 return f.f.ReadAt(s, o) 157 } 158 159 func (f *RegexpFile) Seek(o int64, w int) (int64, error) { 160 return f.f.Seek(o, w) 161 } 162 163 func (f *RegexpFile) Write(s []byte) (int, error) { 164 return f.f.Write(s) 165 } 166 167 func (f *RegexpFile) WriteAt(s []byte, o int64) (int, error) { 168 return f.f.WriteAt(s, o) 169 } 170 171 func (f *RegexpFile) Name() string { 172 return f.f.Name() 173 } 174 175 func (f *RegexpFile) Readdir(c int) (fi []os.FileInfo, err error) { 176 var rfi []os.FileInfo 177 rfi, err = f.f.Readdir(c) 178 if err != nil { 179 return nil, err 180 } 181 for _, i := range rfi { 182 if i.IsDir() || f.re.MatchString(i.Name()) { 183 fi = append(fi, i) 184 } 185 } 186 return fi, nil 187 } 188 189 func (f *RegexpFile) Readdirnames(c int) (n []string, err error) { 190 fi, err := f.Readdir(c) 191 if err != nil { 192 return nil, err 193 } 194 for _, s := range fi { 195 n = append(n, s.Name()) 196 } 197 return n, nil 198 } 199 200 func (f *RegexpFile) Stat() (os.FileInfo, error) { 201 return f.f.Stat() 202 } 203 204 func (f *RegexpFile) Sync() error { 205 return f.f.Sync() 206 } 207 208 func (f *RegexpFile) Truncate(s int64) error { 209 return f.f.Truncate(s) 210 } 211 212 func (f *RegexpFile) WriteString(s string) (int, error) { 213 return f.f.WriteString(s) 214 }