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hash.go
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hash.go
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package processor
import (
"crypto/hmac"
"crypto/md5"
"crypto/sha1"
"crypto/sha256"
"crypto/sha512"
"fmt"
"strconv"
"time"
"github.com/OneOfOne/xxhash"
"github.com/dafanshu/benthos/v3/internal/docs"
"github.com/dafanshu/benthos/v3/internal/tracing"
"github.com/dafanshu/benthos/v3/lib/log"
"github.com/dafanshu/benthos/v3/lib/metrics"
"github.com/dafanshu/benthos/v3/lib/response"
"github.com/dafanshu/benthos/v3/lib/types"
)
//------------------------------------------------------------------------------
func init() {
Constructors[TypeHash] = TypeSpec{
constructor: NewHash,
Status: docs.StatusDeprecated,
Footnotes: `
## Alternatives
All functionality of this processor has been superseded by the
[bloblang](/docs/components/processors/bloblang) processor.`,
FieldSpecs: docs.FieldSpecs{
docs.FieldCommon("algorithm", "The hash algorithm to use.").HasOptions("sha256", "sha512", "sha1", "xxhash64", "hmac-sha1", "hmac-sha256", "hmac-sha512", "md5"),
docs.FieldCommon("key", "key used for HMAC algorithms"),
PartsFieldSpec,
},
}
}
//------------------------------------------------------------------------------
// HashConfig contains configuration fields for the Hash processor.
type HashConfig struct {
Parts []int `json:"parts" yaml:"parts"`
Algorithm string `json:"algorithm" yaml:"algorithm"`
Key string `json:"key" yaml:"key"`
}
// NewHashConfig returns a HashConfig with default values.
func NewHashConfig() HashConfig {
return HashConfig{
Parts: []int{},
Algorithm: "sha256",
}
}
//------------------------------------------------------------------------------
type hashFunc func(bytes []byte) ([]byte, error)
func hmacsha1Hash(key string) hashFunc {
return func(b []byte) ([]byte, error) {
hasher := hmac.New(sha1.New, []byte(key))
hasher.Write(b)
return hasher.Sum(nil), nil
}
}
func hmacsha256Hash(key string) hashFunc {
return func(b []byte) ([]byte, error) {
hasher := hmac.New(sha256.New, []byte(key))
hasher.Write(b)
return hasher.Sum(nil), nil
}
}
func hmacsha512Hash(key string) hashFunc {
return func(b []byte) ([]byte, error) {
hasher := hmac.New(sha512.New, []byte(key))
hasher.Write(b)
return hasher.Sum(nil), nil
}
}
func md5Hash(b []byte) ([]byte, error) {
hasher := md5.New()
hasher.Write(b)
return hasher.Sum(nil), nil
}
func sha1Hash(b []byte) ([]byte, error) {
hasher := sha1.New()
hasher.Write(b)
return hasher.Sum(nil), nil
}
func sha256Hash(b []byte) ([]byte, error) {
hasher := sha256.New()
hasher.Write(b)
return hasher.Sum(nil), nil
}
func sha512Hash(b []byte) ([]byte, error) {
hasher := sha512.New()
hasher.Write(b)
return hasher.Sum(nil), nil
}
func xxhash64Hash(b []byte) ([]byte, error) {
h := xxhash.New64()
h.Write(b)
return []byte(strconv.FormatUint(h.Sum64(), 10)), nil
}
func strToHashr(conf HashConfig) (hashFunc, error) {
switch conf.Algorithm {
case "hmac-sha1":
return hmacsha1Hash(conf.Key), nil
case "hmac-sha256":
return hmacsha256Hash(conf.Key), nil
case "hmac-sha512":
return hmacsha512Hash(conf.Key), nil
case "md5":
return md5Hash, nil
case "sha1":
return sha1Hash, nil
case "sha256":
return sha256Hash, nil
case "sha512":
return sha512Hash, nil
case "xxhash64":
return xxhash64Hash, nil
}
return nil, fmt.Errorf("hash algorithm not recognised: %v", conf.Algorithm)
}
//------------------------------------------------------------------------------
// Hash is a processor that can selectively hash parts of a message following a
// chosen algorithm.
type Hash struct {
conf HashConfig
fn hashFunc
log log.Modular
stats metrics.Type
mCount metrics.StatCounter
mErr metrics.StatCounter
mSent metrics.StatCounter
mBatchSent metrics.StatCounter
}
// NewHash returns a Hash processor.
func NewHash(
conf Config, mgr types.Manager, log log.Modular, stats metrics.Type,
) (Type, error) {
cor, err := strToHashr(conf.Hash)
if err != nil {
return nil, err
}
return &Hash{
conf: conf.Hash,
fn: cor,
log: log,
stats: stats,
mCount: stats.GetCounter("count"),
mErr: stats.GetCounter("error"),
mSent: stats.GetCounter("sent"),
mBatchSent: stats.GetCounter("batch.sent"),
}, nil
}
//------------------------------------------------------------------------------
// ProcessMessage applies the processor to a message, either creating >0
// resulting messages or a response to be sent back to the message source.
func (c *Hash) ProcessMessage(msg types.Message) ([]types.Message, types.Response) {
c.mCount.Incr(1)
newMsg := msg.Copy()
proc := func(index int, span *tracing.Span, part types.Part) error {
newPart, err := c.fn(part.Get())
if err == nil {
newMsg.Get(index).Set(newPart)
} else {
c.log.Debugf("Failed to hash message part: %v\n", err)
c.mErr.Incr(1)
}
return err
}
if newMsg.Len() == 0 {
return nil, response.NewAck()
}
IteratePartsWithSpanV2(TypeHash, c.conf.Parts, newMsg, proc)
c.mBatchSent.Incr(1)
c.mSent.Incr(int64(newMsg.Len()))
msgs := [1]types.Message{newMsg}
return msgs[:], nil
}
// CloseAsync shuts down the processor and stops processing requests.
func (c *Hash) CloseAsync() {
}
// WaitForClose blocks until the processor has closed down.
func (c *Hash) WaitForClose(timeout time.Duration) error {
return nil
}
//------------------------------------------------------------------------------