github.com/maxnasonov/afero@v1.8.4/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) Chown(name string, uid, gid int) error { 64 if err := r.dirOrMatches(name); err != nil { 65 return err 66 } 67 return r.source.Chown(name, uid, gid) 68 } 69 70 func (r *RegexpFs) Name() string { 71 return "RegexpFs" 72 } 73 74 func (r *RegexpFs) Stat(name string) (os.FileInfo, error) { 75 if err := r.dirOrMatches(name); err != nil { 76 return nil, err 77 } 78 return r.source.Stat(name) 79 } 80 81 func (r *RegexpFs) Rename(oldname, newname string) error { 82 dir, err := IsDir(r.source, oldname) 83 if err != nil { 84 return err 85 } 86 if dir { 87 return nil 88 } 89 if err := r.matchesName(oldname); err != nil { 90 return err 91 } 92 if err := r.matchesName(newname); err != nil { 93 return err 94 } 95 return r.source.Rename(oldname, newname) 96 } 97 98 func (r *RegexpFs) RemoveAll(p string) error { 99 dir, err := IsDir(r.source, p) 100 if err != nil { 101 return err 102 } 103 if !dir { 104 if err := r.matchesName(p); err != nil { 105 return err 106 } 107 } 108 return r.source.RemoveAll(p) 109 } 110 111 func (r *RegexpFs) Remove(name string) error { 112 if err := r.dirOrMatches(name); err != nil { 113 return err 114 } 115 return r.source.Remove(name) 116 } 117 118 func (r *RegexpFs) OpenFile(name string, flag int, perm os.FileMode) (File, error) { 119 if err := r.dirOrMatches(name); err != nil { 120 return nil, err 121 } 122 return r.source.OpenFile(name, flag, perm) 123 } 124 125 func (r *RegexpFs) Open(name string) (File, error) { 126 dir, err := IsDir(r.source, name) 127 if err != nil { 128 return nil, err 129 } 130 if !dir { 131 if err := r.matchesName(name); err != nil { 132 return nil, err 133 } 134 } 135 f, err := r.source.Open(name) 136 if err != nil { 137 return nil, err 138 } 139 return &RegexpFile{f: f, re: r.re}, nil 140 } 141 142 func (r *RegexpFs) Mkdir(n string, p os.FileMode) error { 143 return r.source.Mkdir(n, p) 144 } 145 146 func (r *RegexpFs) MkdirAll(n string, p os.FileMode) error { 147 return r.source.MkdirAll(n, p) 148 } 149 150 func (r *RegexpFs) Create(name string) (File, error) { 151 if err := r.matchesName(name); err != nil { 152 return nil, err 153 } 154 return r.source.Create(name) 155 } 156 157 func (f *RegexpFile) Close() error { 158 return f.f.Close() 159 } 160 161 func (f *RegexpFile) Read(s []byte) (int, error) { 162 return f.f.Read(s) 163 } 164 165 func (f *RegexpFile) ReadAt(s []byte, o int64) (int, error) { 166 return f.f.ReadAt(s, o) 167 } 168 169 func (f *RegexpFile) Seek(o int64, w int) (int64, error) { 170 return f.f.Seek(o, w) 171 } 172 173 func (f *RegexpFile) Write(s []byte) (int, error) { 174 return f.f.Write(s) 175 } 176 177 func (f *RegexpFile) WriteAt(s []byte, o int64) (int, error) { 178 return f.f.WriteAt(s, o) 179 } 180 181 func (f *RegexpFile) Name() string { 182 return f.f.Name() 183 } 184 185 func (f *RegexpFile) Readdir(c int) (fi []os.FileInfo, err error) { 186 var rfi []os.FileInfo 187 rfi, err = f.f.Readdir(c) 188 if err != nil { 189 return nil, err 190 } 191 for _, i := range rfi { 192 if i.IsDir() || f.re.MatchString(i.Name()) { 193 fi = append(fi, i) 194 } 195 } 196 return fi, nil 197 } 198 199 func (f *RegexpFile) Readdirnames(c int) (n []string, err error) { 200 fi, err := f.Readdir(c) 201 if err != nil { 202 return nil, err 203 } 204 for _, s := range fi { 205 n = append(n, s.Name()) 206 } 207 return n, nil 208 } 209 210 func (f *RegexpFile) Stat() (os.FileInfo, error) { 211 return f.f.Stat() 212 } 213 214 func (f *RegexpFile) Sync() error { 215 return f.f.Sync() 216 } 217 218 func (f *RegexpFile) Truncate(s int64) error { 219 return f.f.Truncate(s) 220 } 221 222 func (f *RegexpFile) WriteString(s string) (int, error) { 223 return f.f.WriteString(s) 224 }