mirror of
https://github.com/foxcpp/maddy.git
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127 lines
2.8 KiB
Go
127 lines
2.8 KiB
Go
/*
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Maddy Mail Server - Composable all-in-one email server.
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Copyright © 2019-2020 Max Mazurov <fox.cpp@disroot.org>, Maddy Mail Server contributors
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package table
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import (
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"context"
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"fmt"
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"regexp"
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"strings"
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"github.com/foxcpp/maddy/framework/config"
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"github.com/foxcpp/maddy/framework/module"
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)
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type Regexp struct {
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modName string
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instName string
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inlineArgs []string
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re *regexp.Regexp
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replacements []string
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expandPlaceholders bool
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}
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func NewRegexp(modName, instName string, _, inlineArgs []string) (module.Module, error) {
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return &Regexp{
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modName: modName,
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instName: instName,
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inlineArgs: inlineArgs,
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}, nil
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}
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func (r *Regexp) Init(cfg *config.Map) error {
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var (
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fullMatch bool
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caseInsensitive bool
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)
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cfg.Bool("full_match", false, true, &fullMatch)
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cfg.Bool("case_insensitive", false, true, &caseInsensitive)
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cfg.Bool("expand_replaceholders", false, true, &r.expandPlaceholders)
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if _, err := cfg.Process(); err != nil {
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return err
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}
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regex := r.inlineArgs[0]
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if len(r.inlineArgs) > 1 {
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r.replacements = r.inlineArgs[1:]
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}
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if fullMatch {
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if !strings.HasPrefix(regex, "^") {
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regex = "^" + regex
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}
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if !strings.HasSuffix(regex, "$") {
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regex = regex + "$"
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}
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}
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if caseInsensitive {
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regex = "(?i)" + regex
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}
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var err error
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r.re, err = regexp.Compile(regex)
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if err != nil {
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return fmt.Errorf("%s: %v", r.modName, err)
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}
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return nil
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}
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func (r *Regexp) Name() string {
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return r.modName
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}
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func (r *Regexp) InstanceName() string {
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return r.modName
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}
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func (r *Regexp) LookupMulti(_ context.Context, key string) ([]string, error) {
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matches := r.re.FindStringSubmatchIndex(key)
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if matches == nil {
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return []string{}, nil
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}
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result := []string{}
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for _, replacement := range r.replacements {
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if !r.expandPlaceholders {
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result = append(result, replacement)
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} else {
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result = append(result, string(r.re.ExpandString([]byte{}, replacement, key, matches)))
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}
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}
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return result, nil
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}
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func (r *Regexp) Lookup(ctx context.Context, key string) (string, bool, error) {
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newVal, err := r.LookupMulti(ctx, key)
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if err != nil {
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return "", false, err
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}
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if len(newVal) == 0 {
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return "", false, nil
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}
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return newVal[0], true, nil
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}
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func init() {
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module.Register("table.regexp", NewRegexp)
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}
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