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Placeholder to download zoo remote links.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,106 @@ | ||
| package helper | ||
|
|
||
| import ( | ||
| "context" | ||
| "errors" | ||
| "fmt" | ||
| "io" | ||
| "net/http" | ||
| "os" | ||
| "time" | ||
| ) | ||
|
|
||
| const ( | ||
| // Timeout is the HTTP client timeout. | ||
| Timeout = 5 * time.Second | ||
| // User-Agent to send with the HTTP request. | ||
| UserAgent = "Defacto2 2024 app under construction (thanks!)" | ||
| ) | ||
|
|
||
| // DownloadFile downloads a file from a remote URL and saves it to the default temp directory. | ||
| // It returns the path to the downloaded file. | ||
| func DownloadFile(url string) (string, error) { | ||
| // Get the remote file | ||
| client := http.Client{ | ||
| Timeout: Timeout, | ||
| } | ||
| ctx := context.Background() | ||
| req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| req.Header.Set("User-Agent", UserAgent) | ||
| res, err := client.Do(req) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| defer res.Body.Close() | ||
|
|
||
| // Create the file in the default temp directory | ||
| tmpFile, err := os.CreateTemp("", "downloadfile-*") | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| defer tmpFile.Close() | ||
|
|
||
| // Write the body to file | ||
| if _, err := io.Copy(tmpFile, res.Body); err != nil { | ||
| defer os.Remove(tmpFile.Name()) | ||
| return "", err | ||
| } | ||
| return tmpFile.Name(), nil | ||
| } | ||
|
|
||
| // RenameFile renames a file from oldpath to newpath. | ||
| // It returns an error if the oldpath does not exist or is a directory, | ||
| // newpath already exists, or the rename fails. | ||
| func RenameFile(oldpath, newpath string) error { | ||
| st, err := os.Stat(oldpath) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| if st.IsDir() { | ||
| return fmt.Errorf("oldpath %w: %s", ErrFilePath, oldpath) | ||
| } | ||
| if _, err = os.Stat(newpath); err == nil { | ||
| return fmt.Errorf("newpath %w: %s", ErrExistPath, newpath) | ||
| } | ||
| if err := os.Rename(oldpath, newpath); err != nil { | ||
| var linkErr *os.LinkError | ||
| if errors.As(err, &linkErr) && linkErr.Err.Error() == "invalid cross-device link" { | ||
| return RenameCrossDevice(oldpath, newpath) | ||
| } | ||
| return err | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| // RenameCrossDevice is a workaround for renaming files across different devices. | ||
| // A cross device can also be a different file system such as a Docker volume. | ||
| func RenameCrossDevice(oldpath, newpath string) error { | ||
| src, err := os.Open(oldpath) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| defer src.Close() | ||
| dst, err := os.Create(newpath) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| defer dst.Close() | ||
|
|
||
| if _, err = io.Copy(dst, src); err != nil { | ||
| return err | ||
| } | ||
| fi, err := os.Stat(oldpath) | ||
| if err != nil { | ||
| defer os.Remove(newpath) | ||
| return err | ||
| } | ||
| if err = os.Chmod(newpath, fi.Mode()); err != nil { | ||
| defer os.Remove(newpath) | ||
| return err | ||
| } | ||
| defer os.Remove(oldpath) | ||
| return nil | ||
| } |
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