mautrix-whatsapp/config/upgradehelper.go
2021-11-15 14:21:43 +02:00

278 lines
5.8 KiB
Go

// mautrix-whatsapp - A Matrix-WhatsApp puppeting bridge.
// Copyright (C) 2021 Tulir Asokan
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
package config
import (
"fmt"
"os"
"strings"
"gopkg.in/yaml.v3"
)
type YAMLMap map[string]YAMLNode
type YAMLList []YAMLNode
type YAMLNode struct {
*yaml.Node
Map YAMLMap
List YAMLList
Key *yaml.Node
}
type YAMLType uint32
const (
Null YAMLType = 1 << iota
Bool
Str
Int
Float
Timestamp
List
Map
Binary
)
func (t YAMLType) String() string {
switch t {
case Null:
return NullTag
case Bool:
return BoolTag
case Str:
return StrTag
case Int:
return IntTag
case Float:
return FloatTag
case Timestamp:
return TimestampTag
case List:
return SeqTag
case Map:
return MapTag
case Binary:
return BinaryTag
default:
panic(fmt.Errorf("can't convert type %d to string", t))
}
}
func tagToType(tag string) YAMLType {
switch tag {
case NullTag:
return Null
case BoolTag:
return Bool
case StrTag:
return Str
case IntTag:
return Int
case FloatTag:
return Float
case TimestampTag:
return Timestamp
case SeqTag:
return List
case MapTag:
return Map
case BinaryTag:
return Binary
default:
return 0
}
}
const (
NullTag = "!!null"
BoolTag = "!!bool"
StrTag = "!!str"
IntTag = "!!int"
FloatTag = "!!float"
TimestampTag = "!!timestamp"
SeqTag = "!!seq"
MapTag = "!!map"
BinaryTag = "!!binary"
)
func fromNode(node, key *yaml.Node) YAMLNode {
switch node.Kind {
case yaml.DocumentNode:
return fromNode(node.Content[0], nil)
case yaml.AliasNode:
return fromNode(node.Alias, nil)
case yaml.MappingNode:
return YAMLNode{
Node: node,
Map: parseYAMLMap(node),
Key: key,
}
case yaml.SequenceNode:
return YAMLNode{
Node: node,
List: parseYAMLList(node),
}
default:
return YAMLNode{Node: node, Key: key}
}
}
func (yn *YAMLNode) toNode() *yaml.Node {
switch {
case yn.Map != nil && yn.Node.Kind == yaml.MappingNode:
yn.Content = yn.Map.toNodes()
case yn.List != nil && yn.Node.Kind == yaml.SequenceNode:
yn.Content = yn.List.toNodes()
}
return yn.Node
}
func parseYAMLList(node *yaml.Node) YAMLList {
data := make(YAMLList, len(node.Content))
for i, item := range node.Content {
data[i] = fromNode(item, nil)
}
return data
}
func (yl YAMLList) toNodes() []*yaml.Node {
nodes := make([]*yaml.Node, len(yl))
for i, item := range yl {
nodes[i] = item.toNode()
}
return nodes
}
func parseYAMLMap(node *yaml.Node) YAMLMap {
if len(node.Content)%2 != 0 {
panic(fmt.Errorf("uneven number of items in YAML map (%d)", len(node.Content)))
}
data := make(YAMLMap, len(node.Content)/2)
for i := 0; i < len(node.Content); i += 2 {
key := node.Content[i]
value := node.Content[i+1]
if key.Kind == yaml.ScalarNode {
data[key.Value] = fromNode(value, key)
}
}
return data
}
func (ym YAMLMap) toNodes() []*yaml.Node {
nodes := make([]*yaml.Node, len(ym)*2)
i := 0
for key, value := range ym {
nodes[i] = makeStringNode(key)
nodes[i+1] = value.toNode()
i += 2
}
return nodes
}
func makeStringNode(val string) *yaml.Node {
var node yaml.Node
node.SetString(val)
return &node
}
type UpgradeHelper struct {
base YAMLNode
cfg YAMLNode
}
func NewUpgradeHelper(base, cfg *yaml.Node) *UpgradeHelper {
return &UpgradeHelper{
base: fromNode(base, nil),
cfg: fromNode(cfg, nil),
}
}
func (helper *UpgradeHelper) Copy(allowedTypes YAMLType, path ...string) {
base, cfg := helper.base, helper.cfg
var ok bool
for _, item := range path {
base = base.Map[item]
cfg, ok = cfg.Map[item]
if !ok {
return
}
}
if allowedTypes&tagToType(cfg.Tag) == 0 {
_, _ = fmt.Fprintf(os.Stderr, "Ignoring incorrect config field type %s at %s\n", cfg.Tag, strings.Join(path, "->"))
return
}
base.Tag = cfg.Tag
base.Style = cfg.Style
switch base.Kind {
case yaml.ScalarNode:
base.Value = cfg.Value
case yaml.SequenceNode, yaml.MappingNode:
base.Content = cfg.Content
}
}
func getNode(cfg YAMLNode, path []string) *YAMLNode {
var ok bool
for _, item := range path {
cfg, ok = cfg.Map[item]
if !ok {
return nil
}
}
return &cfg
}
func (helper *UpgradeHelper) GetNode(path ...string) *YAMLNode {
return getNode(helper.cfg, path)
}
func (helper *UpgradeHelper) GetBaseNode(path ...string) *YAMLNode {
return getNode(helper.base, path)
}
func (helper *UpgradeHelper) Get(tag YAMLType, path ...string) (string, bool) {
node := helper.GetNode(path...)
if node == nil || node.Kind != yaml.ScalarNode || tag&tagToType(node.Tag) == 0 {
return "", false
}
return node.Value, true
}
func (helper *UpgradeHelper) GetBase(path ...string) string {
return helper.GetBaseNode(path...).Value
}
func (helper *UpgradeHelper) Set(tag YAMLType, value string, path ...string) {
base := helper.base
for _, item := range path {
base = base.Map[item]
}
base.Tag = tag.String()
base.Value = value
}
func (helper *UpgradeHelper) SetMap(value YAMLMap, path ...string) {
base := helper.base
for _, item := range path {
base = base.Map[item]
}
if base.Tag != MapTag || base.Kind != yaml.MappingNode {
panic(fmt.Errorf("invalid target for SetMap(%+v): tag:%s, kind:%d", path, base.Tag, base.Kind))
}
base.Content = value.toNodes()
}