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176 lines (164 loc) · 4.49 KB
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Copy pathreportingtoken.go
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176 lines (164 loc) · 4.49 KB
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// Copyright (c) 2025 Tulir Asokan
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
package whatsmeow
import (
"crypto/hmac"
"crypto/sha256"
_ "embed"
"encoding/binary"
"encoding/json"
"sort"
"sync"
"go.mau.fi/util/exerrors"
"go.mau.fi/util/exstrings"
waBinary "go.mau.fi/whatsmeow/binary"
"go.mau.fi/whatsmeow/proto/waE2E"
"go.mau.fi/whatsmeow/types"
)
//go:embed reportingfields.json
var reportingFieldsJSON string
var getReportingFields = sync.OnceValue(func() (output []reportingField) {
exerrors.PanicIfNotNil(json.Unmarshal(exstrings.UnsafeBytes(reportingFieldsJSON), &output))
return
})
type reportingField struct {
FieldNumber int `json:"f"`
IsMessage bool `json:"m,omitempty"`
Subfields []reportingField `json:"s,omitempty"`
}
func (cli *Client) shouldIncludeReportingToken(message *waE2E.Message) bool {
if !cli.SendReportingTokens {
return false
}
return message.ReactionMessage == nil &&
message.EncReactionMessage == nil &&
message.EncEventResponseMessage == nil &&
message.PollUpdateMessage == nil
}
func (cli *Client) getMessageReportingToken(
msgProtobuf []byte,
msg *waE2E.Message,
senderJID, remoteJID types.JID,
messageID types.MessageID,
) waBinary.Node {
reportingSecret, _ := generateMsgSecretKey(
EncSecretReportToken, remoteJID, messageID, senderJID,
msg.GetMessageContextInfo().GetMessageSecret(),
)
hasher := hmac.New(sha256.New, reportingSecret)
hasher.Write(getReportingToken(msgProtobuf))
return waBinary.Node{
Tag: "reporting",
Content: []waBinary.Node{{
Tag: "reporting_token",
Attrs: waBinary.Attrs{"v": "2"},
Content: hasher.Sum(nil)[:16],
}},
}
}
func getReportingToken(messageProtobuf []byte) []byte {
return extractReportingTokenContent(messageProtobuf, getReportingFields())
}
// Helper to find config for a field number
func getConfigForField(fields []reportingField, fieldNum int) *reportingField {
for i := range fields {
if fields[i].FieldNumber == fieldNum {
return &fields[i]
}
}
return nil
}
// Protobuf wire types
const (
wireVarint = 0
wire64bit = 1
wireBytes = 2
wire32bit = 5
)
// Extracts the reporting token content recursively
func extractReportingTokenContent(data []byte, config []reportingField) []byte {
type field struct {
Num int
Bytes []byte
}
var fields []field
i := 0
for i < len(data) {
// Read tag (varint)
tag, tagLen := binary.Uvarint(data[i:])
if tagLen <= 0 {
break // malformed
}
fieldNum := int(tag >> 3)
wireType := int(tag & 0x7)
fieldCfg := getConfigForField(config, fieldNum)
fieldStart := i
i += tagLen
if fieldCfg == nil {
// Skip field
switch wireType {
case wireVarint:
_, n := binary.Uvarint(data[i:])
i += n
case wire64bit:
i += 8
case wireBytes:
l, n := binary.Uvarint(data[i:])
i += n + int(l)
case wire32bit:
i += 4
default:
return nil
}
continue
}
switch wireType {
case wireVarint:
_, n := binary.Uvarint(data[i:])
i += n
fields = append(fields, field{Num: fieldNum, Bytes: data[fieldStart:i]})
case wire64bit:
i += 8
fields = append(fields, field{Num: fieldNum, Bytes: data[fieldStart:i]})
case wireBytes:
l, n := binary.Uvarint(data[i:])
valStart := i + n
valEnd := valStart + int(l)
if fieldCfg.IsMessage || len(fieldCfg.Subfields) > 0 {
// Recursively extract subfields
sub := extractReportingTokenContent(data[valStart:valEnd], fieldCfg.Subfields)
if len(sub) > 0 {
// Re-encode tag and length
buf := make([]byte, 0, tagLen+n+len(sub))
tagBuf := make([]byte, binary.MaxVarintLen64)
tagN := binary.PutUvarint(tagBuf, tag)
lenBuf := make([]byte, binary.MaxVarintLen64)
lenN := binary.PutUvarint(lenBuf, uint64(len(sub)))
buf = append(buf, tagBuf[:tagN]...)
buf = append(buf, lenBuf[:lenN]...)
buf = append(buf, sub...)
fields = append(fields, field{Num: fieldNum, Bytes: buf})
}
} else {
fields = append(fields, field{Num: fieldNum, Bytes: data[fieldStart:valEnd]})
}
i = valEnd
case wire32bit:
i += 4
fields = append(fields, field{Num: fieldNum, Bytes: data[fieldStart:i]})
default:
return nil
}
}
// Sort by field number
sort.Slice(fields, func(i, j int) bool { return fields[i].Num < fields[j].Num })
// Concatenate
var out []byte
for _, f := range fields {
out = append(out, f.Bytes...)
}
return out
}