| 1 | package runs |
| 2 | |
| 3 | import ( |
| 4 | "errors" |
| 5 | "strings" |
| 6 | "time" |
| 7 | "unicode" |
| 8 | "unicode/utf8" |
| 9 | ) |
| 10 | |
| 11 | var ( |
| 12 | ErrBadApp = errors.New("runs: not an account and app") |
| 13 | ErrBadID = errors.New("runs: not a run id") |
| 14 | ErrNoArgs = errors.New("runs: no arguments") |
| 15 | ErrTooManyArgs = errors.New("runs: more than 256 arguments") |
| 16 | ErrArgvTooLarge = errors.New("runs: arguments over 64 KB") |
| 17 | ErrArgNUL = errors.New("runs: an argument holds a NUL byte") |
| 18 | ErrTimeout = errors.New("runs: timeout outside 1s to 6h") |
| 19 | ErrFilesTooLarge = errors.New("runs: files over 64 MB") |
| 20 | ErrFileName = errors.New("runs: not a plain file name") |
| 21 | ErrFileTwice = errors.New("runs: two files share a name") |
| 22 | ) |
| 23 | |
| 24 | // FileNameError names the file a refusal is about. |
| 25 | type FileNameError struct { |
| 26 | Name string |
| 27 | Twice bool |
| 28 | } |
| 29 | |
| 30 | func (e *FileNameError) Error() string { |
| 31 | if e.Twice { |
| 32 | return ErrFileTwice.Error() + ": " + e.Name |
| 33 | } |
| 34 | return ErrFileName.Error() + ": " + e.Name |
| 35 | } |
| 36 | |
| 37 | func (e *FileNameError) Is(target error) bool { |
| 38 | return (e.Twice && target == ErrFileTwice) || (!e.Twice && target == ErrFileName) |
| 39 | } |
| 40 | |
| 41 | // CheckArgv is spec §5.1's argv rule. |
| 42 | func CheckArgv(argv []string) error { |
| 43 | switch { |
| 44 | case len(argv) == 0: |
| 45 | return ErrNoArgs |
| 46 | case len(argv) > MaxArgs: |
| 47 | return ErrTooManyArgs |
| 48 | } |
| 49 | total := 0 |
| 50 | for _, a := range argv { |
| 51 | if strings.IndexByte(a, 0) >= 0 { |
| 52 | return ErrArgNUL |
| 53 | } |
| 54 | total += len(a) |
| 55 | } |
| 56 | if total > MaxArgvBytes { |
| 57 | return ErrArgvTooLarge |
| 58 | } |
| 59 | return nil |
| 60 | } |
| 61 | |
| 62 | // CheckTimeout is spec §5.1's timeout rule. |
| 63 | func CheckTimeout(d time.Duration) error { |
| 64 | if d < MinTimeout || d > MaxTimeout { |
| 65 | return ErrTimeout |
| 66 | } |
| 67 | return nil |
| 68 | } |
| 69 | |
| 70 | // PlainName reports whether name is a plain base name: not empty, at most |
| 71 | // 255 bytes, valid UTF-8, no slash, backslash or control character, and |
| 72 | // not "." or "..". The console checks it, and the box again (spec §7). |
| 73 | func PlainName(name string) bool { |
| 74 | if name == "" || name == "." || name == ".." || len(name) > 255 || !utf8.ValidString(name) { |
| 75 | return false |
| 76 | } |
| 77 | for _, r := range name { |
| 78 | if r == '/' || r == '\\' || unicode.IsControl(r) { |
| 79 | return false |
| 80 | } |
| 81 | } |
| 82 | return true |
| 83 | } |
| 84 | |
| 85 | // CheckFiles is spec §5.1's file rule: plain names, each once, sizes not |
| 86 | // negative, 64 MB in total. |
| 87 | func CheckFiles(files []MetaFile) error { |
| 88 | seen := map[string]bool{} |
| 89 | var total int64 |
| 90 | for _, f := range files { |
| 91 | if !PlainName(f.Name) { |
| 92 | return &FileNameError{Name: f.Name} |
| 93 | } |
| 94 | if seen[f.Name] { |
| 95 | return &FileNameError{Name: f.Name, Twice: true} |
| 96 | } |
| 97 | seen[f.Name] = true |
| 98 | if f.Size < 0 { |
| 99 | return ErrFilesTooLarge |
| 100 | } |
| 101 | total += f.Size |
| 102 | if total > MaxFileBytes { |
| 103 | return ErrFilesTooLarge |
| 104 | } |
| 105 | } |
| 106 | return nil |
| 107 | } |
| 108 | |
amadan