view cmd/sievemgr/internal/config/parser.go @ 19:854167f55839

Fix SRV record lookup Do not use a configuration file default value for port in order to detect when it is not set by the user so that SRV record lookup is triggered. Depend on version 0.8.1 of go.guido-berhoerster.org/managesieve which contains an additional necessary fix.
author Guido Berhoerster <guido+sievemgr@berhoerster.name>
date Wed, 03 Feb 2021 13:34:44 +0100
parents 4dff4c3f0fbb
children
line wrap: on
line source

// Copyright (C) 2020 Guido Berhoerster <guido+sievemgr@berhoerster.name>
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

package config

import (
	"fmt"
	"strconv"
)

type parser struct {
	s *scanner
}

func (p *parser) scanType(expectedTok token) (string, error) {
	tok, lit, err := p.s.scan()
	if err != nil {
		return lit, NewParserError(err.Error(), p.s.line)
	} else if tok != expectedTok {
		return lit, NewParserError(fmt.Sprintf("expected %s, got %s %q", expectedTok, tok, lit), p.s.line)
	}
	return lit, nil
}

func (p *parser) validateAccount(acct *Account) error {
	if acct.Host == "" {
		return NewParserError(fmt.Sprintf("no host specified for account %q",
			acct.Name), 0)
	} else if acct.User == "" {
		return NewParserError(fmt.Sprintf("no user specified for account %q",
			acct.Name), 0)
	}
	return nil
}

func (p *parser) parse(conf *Configuration) error {
	var acct *Account
	var isDefault bool
	var tok token
	var lit string
	var err error
parsing:
	for {
		tok, lit, err = p.s.scan()
		if err != nil {
			err = NewParserError(err.Error(), p.s.line)
			break parsing
		}
		if tok == tokenIllegal {
			err = NewParserError(fmt.Sprintf("illegal token %q", lit), p.s.line)
			break parsing
		} else if tok == tokenEOF {
			break parsing
		} else if tok != tokenIdent {
			err = NewParserError(fmt.Sprintf("expected identifier, got %s %q", tok, lit), p.s.line)
			break parsing
		}
		switch lit {
		case "account":
			if acct != nil {
				if err = p.validateAccount(acct); err != nil {
					break parsing
				}
				conf.Accounts = append(conf.Accounts, acct)
				if isDefault {
					conf.Default = acct
					isDefault = false
				}
			}

			// account name
			if lit, err = p.scanType(tokenString); err != nil {
				break parsing
			}
			acct = &Account{
				Name: lit,
			}
		case "default":
			isDefault = true
		case "host":
			if lit, err = p.scanType(tokenString); err != nil {
				break parsing
			}
			acct.Host = lit
		case "port":
			if lit, err = p.scanType(tokenNumber); err != nil {
				break parsing
			}
			var port int
			if port, err = strconv.Atoi(lit); err != nil {
				err = NewParserError(fmt.Sprintf("failed to parse port: %s", err), p.s.line)
				break parsing
			} else if port < 1 || port > 65535 {
				err = NewParserError(fmt.Sprintf("invalid port number %d", port), p.s.line)
				break parsing
			}
			acct.Port = lit
		case "user":
			if lit, err = p.scanType(tokenString); err != nil {
				break parsing
			}
			acct.User = lit
		case "pass":
			if lit, err = p.scanType(tokenString); err != nil {
				break parsing
			}
			acct.Password = lit
		case "insecure":
			acct.Insecure = true
		default:
			err = NewParserError(fmt.Sprintf("unknown %s: %q", tok, lit), p.s.line)
			break parsing
		}
	}
	if err != nil {
		return err
	}
	if acct != nil {
		if err = p.validateAccount(acct); err != nil {
			return err
		}
		conf.Accounts = append(conf.Accounts, acct)
		if isDefault {
			conf.Default = acct
		}
	}

	return nil
}