// Parse parses the input commandline string (cmd, flags, and args).
// returns the corresponding command Request object.
func Parse(input []string, stdin *os.File, root *cmds.Command) (cmds.Request, *cmds.Command, []string, error) {
path, opts, stringVals, cmd, err := parseOpts(input, root)
if err != nil {
return nil, nil, path, err
}
optDefs, err := root.GetOptions(path)
if err != nil {
return nil, cmd, path, err
}
req, err := cmds.NewRequest(path, opts, nil, nil, cmd, optDefs)
if err != nil {
return nil, cmd, path, err
}
// if -r is provided, and it is associated with the package builtin
// recursive path option, allow recursive file paths
recursiveOpt := req.Option(cmds.RecShort)
recursive := false
if recursiveOpt != nil && recursiveOpt.Definition() == cmds.OptionRecursivePath {
recursive, _, err = recursiveOpt.Bool()
if err != nil {
return req, nil, nil, u.ErrCast()
}
}
stringArgs, fileArgs, err := parseArgs(stringVals, stdin, cmd.Arguments, recursive, root)
if err != nil {
return req, cmd, path, err
}
req.SetArguments(stringArgs)
file := files.NewSliceFile("", "", fileArgs)
req.SetFiles(file)
err = cmd.CheckArguments(req)
if err != nil {
return req, cmd, path, err
}
return req, cmd, path, nil
}
// Parse parses the data in a http.Request and returns a command Request object
func Parse(r *http.Request, root *cmds.Command) (cmds.Request, error) {
if !strings.HasPrefix(r.URL.Path, ApiPath) {
return nil, errors.New("Unexpected path prefix")
}
path := strings.Split(strings.TrimPrefix(r.URL.Path, ApiPath+"/"), "/")
stringArgs := make([]string, 0)
cmd, err := root.Get(path[:len(path)-1])
if err != nil {
// 404 if there is no command at that path
return nil, ErrNotFound
} else if sub := cmd.Subcommand(path[len(path)-1]); sub == nil {
if len(path) <= 1 {
return nil, ErrNotFound
}
// if the last string in the path isn't a subcommand, use it as an argument
// e.g. /objects/Qabc12345 (we are passing "Qabc12345" to the "objects" command)
stringArgs = append(stringArgs, path[len(path)-1])
path = path[:len(path)-1]
} else {
cmd = sub
}
opts, stringArgs2 := parseOptions(r)
stringArgs = append(stringArgs, stringArgs2...)
// count required argument definitions
numRequired := 0
for _, argDef := range cmd.Arguments {
if argDef.Required {
numRequired++
}
}
// count the number of provided argument values
valCount := len(stringArgs)
args := make([]string, valCount)
valIndex := 0
requiredFile := ""
for _, argDef := range cmd.Arguments {
// skip optional argument definitions if there aren't sufficient remaining values
if valCount-valIndex <= numRequired && !argDef.Required {
continue
} else if argDef.Required {
numRequired--
}
if argDef.Type == cmds.ArgString {
if argDef.Variadic {
for _, s := range stringArgs {
args[valIndex] = s
valIndex++
}
valCount -= len(stringArgs)
} else if len(stringArgs) > 0 {
args[valIndex] = stringArgs[0]
stringArgs = stringArgs[1:]
valIndex++
} else {
break
}
} else if argDef.Type == cmds.ArgFile && argDef.Required && len(requiredFile) == 0 {
requiredFile = argDef.Name
}
}
optDefs, err := root.GetOptions(path)
if err != nil {
return nil, err
}
// create cmds.File from multipart/form-data contents
contentType := r.Header.Get(contentTypeHeader)
mediatype, _, _ := mime.ParseMediaType(contentType)
var f *files.MultipartFile
if mediatype == "multipart/form-data" {
f = &files.MultipartFile{Mediatype: mediatype}
f.Reader, err = r.MultipartReader()
if err != nil {
return nil, err
}
}
// if there is a required filearg, error if no files were provided
if len(requiredFile) > 0 && f == nil {
return nil, fmt.Errorf("File argument '%s' is required", requiredFile)
}
req, err := cmds.NewRequest(path, opts, args, f, cmd, optDefs)
if err != nil {
return nil, err
}
err = cmd.CheckArguments(req)
if err != nil {
return nil, err
}
return req, nil
}
// Parse a command line made up of sub-commands, short arguments, long arguments and positional arguments
func parseOpts(args []string, root *cmds.Command) (
path []string,
opts map[string]interface{},
stringVals []string,
cmd *cmds.Command,
err error,
) {
path = make([]string, 0, len(args))
stringVals = make([]string, 0, len(args))
optDefs := map[string]cmds.Option{}
opts = map[string]interface{}{}
cmd = root
// parseFlag checks that a flag is valid and saves it into opts
// Returns true if the optional second argument is used
parseFlag := func(name string, arg *string, mustUse bool) (bool, error) {
if _, ok := opts[name]; ok {
return false, fmt.Errorf("Duplicate values for option '%s'", name)
}
optDef, found := optDefs[name]
if !found {
err = fmt.Errorf("Unrecognized option '%s'", name)
return false, err
}
if optDef.Type() == cmds.Bool {
if mustUse {
return false, fmt.Errorf("Option '%s' takes no arguments, but was passed '%s'", name, *arg)
}
opts[name] = ""
return false, nil
} else {
if arg == nil {
return true, fmt.Errorf("Missing argument for option '%s'", name)
}
opts[name] = *arg
return true, nil
}
}
optDefs, err = root.GetOptions(path)
if err != nil {
return
}
consumed := false
for i, arg := range args {
switch {
case consumed:
// arg was already consumed by the preceding flag
consumed = false
continue
case arg == "--":
// treat all remaining arguments as positional arguments
stringVals = append(stringVals, args[i+1:]...)
return
case strings.HasPrefix(arg, "--"):
// arg is a long flag, with an optional argument specified
// using `=' or in args[i+1]
var slurped bool
var next *string
split := strings.SplitN(arg, "=", 2)
if len(split) == 2 {
slurped = false
arg = split[0]
next = &split[1]
} else {
slurped = true
if i+1 < len(args) {
next = &args[i+1]
} else {
next = nil
}
}
consumed, err = parseFlag(arg[2:], next, len(split) == 2)
if err != nil {
return
}
if !slurped {
consumed = false
}
case strings.HasPrefix(arg, "-") && arg != "-":
// args is one or more flags in short form, followed by an optional argument
// all flags except the last one have type bool
for arg = arg[1:]; len(arg) != 0; arg = arg[1:] {
var rest *string
var slurped bool
mustUse := false
if len(arg) > 1 {
slurped = false
str := arg[1:]
if len(str) > 0 && str[0] == '=' {
str = str[1:]
mustUse = true
}
rest = &str
} else {
slurped = true
if i+1 < len(args) {
rest = &args[i+1]
} else {
rest = nil
}
}
var end bool
end, err = parseFlag(arg[0:1], rest, mustUse)
if err != nil {
return
}
if end {
consumed = slurped
break
}
}
default:
// arg is a sub-command or a positional argument
sub := cmd.Subcommand(arg)
if sub != nil {
cmd = sub
path = append(path, arg)
optDefs, err = root.GetOptions(path)
if err != nil {
return
}
} else {
stringVals = append(stringVals, arg)
}
}
}
return
}