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Adding the possibility to translate the msg.Data before output.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,93 @@ | ||
| package cli | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "errors" | ||
| "fmt" | ||
| "os/exec" | ||
| "strings" | ||
| ) | ||
|
|
||
| func filterDataThroughCmd(data []byte, filter string, subject string) ([]byte, error) { | ||
| parts, err := parseCommandLine(filter) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("the filter command line could not be parsed: %w", err) | ||
| } | ||
| cmd := parts[0] | ||
| args := parts[1:] | ||
| // maybe we want to replace some strings to give the filter something to reason about? | ||
| for idx, arg := range args { | ||
| args[idx] = strings.ReplaceAll(arg, "{{subject}}", subject) | ||
| } | ||
| runner := exec.Command(cmd, args...) | ||
| // pass the message as string to stdin | ||
| runner.Stdin = bytes.NewReader(data) | ||
| // maybe we want to do something on error? | ||
| return runner.CombinedOutput() | ||
| } | ||
|
|
||
| func parseCommandLine(command string) ([]string, error) { | ||
| // copied from https://stackoverflow.com/questions/34118732/parse-a-command-line-string-into-flags-and-arguments-in-golang | ||
| // could be optimized but I think it is good enough for this use case | ||
| var args []string | ||
| state := "start" | ||
| current := "" | ||
| quote := "\"" | ||
| escapeNext := true | ||
| for _, c := range command { | ||
|
|
||
| if state == "quotes" { | ||
| if string(c) != quote { | ||
| current += string(c) | ||
| } else { | ||
| args = append(args, current) | ||
| current = "" | ||
| state = "start" | ||
| } | ||
| continue | ||
| } | ||
|
|
||
| if escapeNext { | ||
| current += string(c) | ||
| escapeNext = false | ||
| continue | ||
| } | ||
|
|
||
| if c == '\\' { | ||
| escapeNext = true | ||
| continue | ||
| } | ||
|
|
||
| if c == '"' || c == '\'' { | ||
| state = "quotes" | ||
| quote = string(c) | ||
| continue | ||
| } | ||
|
|
||
| if state == "arg" { | ||
| if c == ' ' || c == '\t' { | ||
| args = append(args, current) | ||
| current = "" | ||
| state = "start" | ||
| } else { | ||
| current += string(c) | ||
| } | ||
| continue | ||
| } | ||
|
|
||
| if c != ' ' && c != '\t' { | ||
| state = "arg" | ||
| current += string(c) | ||
| } | ||
| } | ||
|
|
||
| if state == "quotes" { | ||
| return []string{}, errors.New(fmt.Sprintf("Unclosed quote in command line: %s", command)) | ||
| } | ||
|
|
||
| if current != "" { | ||
| args = append(args, current) | ||
| } | ||
|
|
||
| return args, nil | ||
| } |
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