134 lines
3.3 KiB
Go
134 lines
3.3 KiB
Go
// Copyright 2015 Light Code Labs, LLC
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package caddy
|
|
|
|
import (
|
|
"errors"
|
|
"runtime"
|
|
"unicode"
|
|
|
|
"github.com/flynn/go-shlex"
|
|
)
|
|
|
|
var runtimeGoos = runtime.GOOS
|
|
|
|
// SplitCommandAndArgs takes a command string and parses it shell-style into the
|
|
// command and its separate arguments.
|
|
func SplitCommandAndArgs(command string) (cmd string, args []string, err error) {
|
|
var parts []string
|
|
|
|
if runtimeGoos == "windows" {
|
|
parts = parseWindowsCommand(command) // parse it Windows-style
|
|
} else {
|
|
parts, err = parseUnixCommand(command) // parse it Unix-style
|
|
if err != nil {
|
|
err = errors.New("error parsing command: " + err.Error())
|
|
return
|
|
}
|
|
}
|
|
|
|
if len(parts) == 0 {
|
|
err = errors.New("no command contained in '" + command + "'")
|
|
return
|
|
}
|
|
|
|
cmd = parts[0]
|
|
if len(parts) > 1 {
|
|
args = parts[1:]
|
|
}
|
|
|
|
return
|
|
}
|
|
|
|
// parseUnixCommand parses a unix style command line and returns the
|
|
// command and its arguments or an error
|
|
func parseUnixCommand(cmd string) ([]string, error) {
|
|
return shlex.Split(cmd)
|
|
}
|
|
|
|
// parseWindowsCommand parses windows command lines and
|
|
// returns the command and the arguments as an array. It
|
|
// should be able to parse commonly used command lines.
|
|
// Only basic syntax is supported:
|
|
// - spaces in double quotes are not token delimiters
|
|
// - double quotes are escaped by either backspace or another double quote
|
|
// - except for the above case backspaces are path separators (not special)
|
|
//
|
|
// Many sources point out that escaping quotes using backslash can be unsafe.
|
|
// Use two double quotes when possible. (Source: http://stackoverflow.com/a/31413730/2616179 )
|
|
//
|
|
// This function has to be used on Windows instead
|
|
// of the shlex package because this function treats backslash
|
|
// characters properly.
|
|
func parseWindowsCommand(cmd string) []string {
|
|
const backslash = '\\'
|
|
const quote = '"'
|
|
|
|
var parts []string
|
|
var part string
|
|
var inQuotes bool
|
|
var lastRune rune
|
|
|
|
for i, ch := range cmd {
|
|
|
|
if i != 0 {
|
|
lastRune = rune(cmd[i-1])
|
|
}
|
|
|
|
if ch == backslash {
|
|
// put it in the part - for now we don't know if it's an
|
|
// escaping char or path separator
|
|
part += string(ch)
|
|
continue
|
|
}
|
|
|
|
if ch == quote {
|
|
if lastRune == backslash {
|
|
// remove the backslash from the part and add the escaped quote instead
|
|
part = part[:len(part)-1]
|
|
part += string(ch)
|
|
continue
|
|
}
|
|
|
|
if lastRune == quote {
|
|
// revert the last change of the inQuotes state
|
|
// it was an escaping quote
|
|
inQuotes = !inQuotes
|
|
part += string(ch)
|
|
continue
|
|
}
|
|
|
|
// normal escaping quotes
|
|
inQuotes = !inQuotes
|
|
continue
|
|
|
|
}
|
|
|
|
if unicode.IsSpace(ch) && !inQuotes && len(part) > 0 {
|
|
parts = append(parts, part)
|
|
part = ""
|
|
continue
|
|
}
|
|
|
|
part += string(ch)
|
|
}
|
|
|
|
if len(part) > 0 {
|
|
parts = append(parts, part)
|
|
}
|
|
|
|
return parts
|
|
}
|