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msg.go
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msg.go
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// Copyright (c) 2021-2022, R.I. Pienaar and the Choria Project contributors
//
// SPDX-License-Identifier: Apache-2.0
package submission
import (
"encoding/hex"
"errors"
"fmt"
"os"
"strconv"
"strings"
"time"
"github.com/choria-io/go-choria/internal/util"
"github.com/nats-io/nats.go"
)
type Message struct {
ID string `json:"id"`
Subject string `json:"subject"`
Payload []byte `json:"payload"`
Reliable bool `json:"reliable"`
Priority uint `json:"priority"`
Created time.Time `json:"created"`
TTL float64 `json:"ttl"`
MaxTries uint `json:"max_tries"`
Tries uint `json:"tries"`
NextTry time.Time `json:"next_try"`
Sender string `json:"sender"`
Identity string `json:"identity"`
Sign bool `json:"sign"`
Headers map[string]string `json:"headers"`
st StoreType
sm any
}
func newMessage(sender string) *Message {
return &Message{
ID: util.UniqueID(),
Created: time.Now(),
MaxTries: 500,
TTL: defaultTTL.Seconds(),
Sender: sender,
}
}
var (
ErrMessageExpired = errors.New("message has expired")
ErrMessageMaxTries = errors.New("message reached maximum tries")
ErrSeedFileNotSet = errors.New("seed file not set to sign message")
ErrSeedFileNotFound = errors.New("seed file not found")
ErrSignatureFailed = errors.New("could not calculate message signature")
ErrReservedHeaderName = errors.New("headers may not start with 'choria' or 'nats'")
)
const (
HdrNatsMsgId = "Nats-Msg-Id"
HdrChoriaPriority = "Choria-Priority"
HdrChoriaCreated = "Choria-Created"
HdrChoriaSender = "Choria-Sender"
HdrChoriaReliable = "Choria-Reliable"
HdrChoriaTries = "Choria-Tries"
HdrChoriaIdentity = "Choria-Identity"
HdrChoriaToken = "Choria-Token"
HdrChoriaSignature = "Choria-Signature"
HdrChoriaPrefix = "choria"
HdrNatsPrefix = "nats"
)
func (m *Message) Validate() error {
if m.Subject == "" {
return fmt.Errorf("subject is required")
}
if len(m.Payload) == 0 {
return fmt.Errorf("payload is required")
}
if m.Priority > 4 {
return fmt.Errorf("priority must be 0...4")
}
if m.Created.IsZero() {
return fmt.Errorf("created time is zero")
}
if m.TTL == 0 {
return fmt.Errorf("ttl may not be 0")
}
if m.TTL > maxTTL.Seconds() {
return fmt.Errorf("ttl exceeds maximum %s", maxTTL)
}
if m.Sender == "" {
return fmt.Errorf("sender is required")
}
if time.Since(m.Created) > (time.Duration(m.TTL) * time.Second) {
return ErrMessageExpired
}
for k := range m.Headers {
kl := strings.ToLower(k)
if strings.HasPrefix(kl, HdrChoriaPrefix) || strings.HasPrefix(kl, HdrNatsPrefix) {
return ErrReservedHeaderName
}
}
return nil
}
func (m *Message) NatsMessage(prefix string, seed string, token string) (*nats.Msg, error) {
err := m.Validate()
if err != nil {
return nil, err
}
if m.Tries >= m.MaxTries {
return nil, ErrMessageMaxTries
}
msg := nats.NewMsg(prefix + m.Subject)
for k, v := range m.Headers {
msg.Header.Add(k, v)
}
msg.Header.Add(HdrNatsMsgId, m.ID)
msg.Header.Add(HdrChoriaPriority, strconv.Itoa(int(m.Priority)))
msg.Header.Add(HdrChoriaCreated, strconv.Itoa(int(m.Created.UnixNano())))
msg.Header.Add(HdrChoriaSender, m.Sender)
if m.Reliable {
msg.Header.Add(HdrChoriaReliable, "1")
}
if m.Tries > 0 {
msg.Header.Add(HdrChoriaTries, strconv.Itoa(int(m.Tries)))
}
if m.Identity != "" {
msg.Header.Add(HdrChoriaIdentity, m.Identity)
}
msg.Data = m.Payload
if m.Sign {
if seed == "" {
return nil, ErrSeedFileNotSet
}
if !util.FileExist(seed) {
return nil, ErrSeedFileNotFound
}
sig, err := util.Ed25519SignWithSeedFile(seed, msg.Data)
if err != nil {
return nil, fmt.Errorf("%w: %v", ErrSignatureFailed, err)
}
if token != "" && util.FileExist(token) {
t, err := os.ReadFile(token)
if err != nil {
return nil, fmt.Errorf("%w: %v", ErrSignatureFailed, err)
}
msg.Header.Add(HdrChoriaToken, string(t))
}
msg.Header.Add(HdrChoriaSignature, hex.EncodeToString(sig))
}
return msg, nil
}