mirror of
https://github.com/foxcpp/maddy.git
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131 lines
3 KiB
Go
131 lines
3 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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"github.com/foxcpp/maddy/framework/config"
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modconfig "github.com/foxcpp/maddy/framework/config/module"
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"github.com/foxcpp/maddy/framework/module"
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)
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type Chain struct {
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modName string
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instName string
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chain []module.Table
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optional []bool
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}
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func NewChain(modName, instName string, _, _ []string) (module.Module, error) {
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return &Chain{
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modName: modName,
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instName: instName,
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}, nil
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}
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func (s *Chain) Init(cfg *config.Map) error {
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cfg.Callback("step", func(m *config.Map, node config.Node) error {
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var tbl module.Table
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err := modconfig.ModuleFromNode("table", node.Args, node, m.Globals, &tbl)
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if err != nil {
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return err
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}
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s.chain = append(s.chain, tbl)
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s.optional = append(s.optional, false)
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return nil
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})
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cfg.Callback("optional_step", func(m *config.Map, node config.Node) error {
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var tbl module.Table
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err := modconfig.ModuleFromNode("table", node.Args, node, m.Globals, &tbl)
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if err != nil {
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return err
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}
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s.chain = append(s.chain, tbl)
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s.optional = append(s.optional, true)
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return nil
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})
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_, err := cfg.Process()
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return err
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}
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func (s *Chain) Name() string {
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return s.modName
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}
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func (s *Chain) InstanceName() string {
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return s.instName
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}
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func (s *Chain) Lookup(ctx context.Context, key string) (string, bool, error) {
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newVal, err := s.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 (s *Chain) LookupMulti(ctx context.Context, key string) ([]string, error) {
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result := []string{key}
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STEP:
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for i, step := range s.chain {
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newResult := []string{}
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for _, key = range result {
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if step_multi, ok := step.(module.MultiTable); ok {
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val, err := step_multi.LookupMulti(ctx, key)
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if err != nil {
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return []string{}, err
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}
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if len(val) == 0 {
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if s.optional[i] {
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continue STEP
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}
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return []string{}, nil
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}
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newResult = append(newResult, val...)
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} else {
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val, ok, err := step.Lookup(ctx, key)
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if err != nil {
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return []string{}, err
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}
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if !ok {
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if s.optional[i] {
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continue STEP
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}
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return []string{}, nil
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}
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newResult = append(newResult, val)
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}
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}
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result = newResult
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}
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return result, nil
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}
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func init() {
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module.Register("table.chain", NewChain)
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}
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