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package main |
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import ( |
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"errors" |
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"github.com/mattn/go-isatty" |
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"net" |
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"net/url" |
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"os" |
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"path/filepath" |
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"strings" |
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) |
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// FatalCheck panics if err is not nil. |
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func FatalCheck(err error) { |
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if err != nil { |
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Errorf("%v", err) |
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panic(err) |
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} |
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} |
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// FilterIPV4 returns parsed ipv4 string. |
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func FilterIPV4(ips []net.IP) []string { |
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var ret = make([]string, 0) |
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for _, ip := range ips { |
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if ip.To4() != nil { |
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ret = append(ret, ip.String()) |
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} |
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} |
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return ret |
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} |
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// MkdirIfNotExist creates `folder` directory if not available |
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func MkdirIfNotExist(folder string) error { |
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if _, err := os.Stat(folder); err != nil { |
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if err = os.MkdirAll(folder, 0700); err != nil { |
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return err |
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} |
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} |
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return nil |
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} |
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// ExistDir checks if `folder` is available |
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func ExistDir(folder string) bool { |
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_, err := os.Stat(folder) |
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return err == nil |
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} |
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// DisplayProgressBar shows a fancy progress bar |
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func DisplayProgressBar() bool { |
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return isatty.IsTerminal(os.Stdout.Fd()) && displayProgress |
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} |
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// FolderOf makes sure you won't get LFI |
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func FolderOf(url string) string { |
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safePath := filepath.Join(os.Getenv("HOME"), dataFolder) |
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fullQualifyPath, err := filepath.Abs(filepath.Join(os.Getenv("HOME"), dataFolder, filepath.Base(url))) |
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FatalCheck(err) |
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//must ensure full qualify path is CHILD of safe path |
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//to prevent directory traversal attack |
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//using Rel function to get relative between parent and child |
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//if relative join base == child, then child path MUST BE real child |
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relative, err := filepath.Rel(safePath, fullQualifyPath) |
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FatalCheck(err) |
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if strings.Contains(relative, "..") { |
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FatalCheck(errors.New("you may be a victim of directory traversal path attack")) |
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return "" //return is redundant be cause in fatal check we have panic, but compiler does not able to check |
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} |
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return fullQualifyPath |
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} |
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// TaskFromURL runs when you want to download a single url |
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func TaskFromURL(url string) string { |
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//task is just download file name |
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//so we get download file name on url |
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filename := filepath.Base(url) |
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return filename |
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} |
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// IsURL checks if `s` is actually a parsable URL. |
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func IsURL(s string) bool { |
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_, err := url.Parse(s) |
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return err == nil |
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} |
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abzcoding /
hget
