コード例 #1
0
ファイル: parse.go プロジェクト: djbarber/ipfs-hack
// 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
}
コード例 #2
0
ファイル: parse.go プロジェクト: djbarber/ipfs-hack
// 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
}
コード例 #3
0
ファイル: parse.go プロジェクト: djbarber/ipfs-hack
// 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
}