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Support for AWS Elasticsearch using AWS SDK v2 (#597)
* Support for AWS Elasticsearch using AWS SDK v2 (#1) Signed-off-by: Roshan Patil <patilroshan443@gmail.com> * Fixes PR comments Signed-off-by: Roshan Patil <patilroshan443@gmail.com> * Resolved PR comments Signed-off-by: Roshan Patil <patilroshan443@gmail.com> * Fix PR comments Signed-off-by: Roshan Patil <patilroshan443@gmail.com>
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// Copyright 2022 The Prometheus Authors | ||
// Licensed under the Apache License, Version 2.0 (the "License"); | ||
// you may not use this file except in compliance with the License. | ||
// You may obtain a copy of the License at | ||
// | ||
// http://www.apache.org/licenses/LICENSE-2.0 | ||
// | ||
// Unless required by applicable law or agreed to in writing, software | ||
// distributed under the License is distributed on an "AS IS" BASIS, | ||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
// See the License for the specific language governing permissions and | ||
// limitations under the License. | ||
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package roundtripper | ||
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import ( | ||
"bytes" | ||
"context" | ||
"crypto/sha256" | ||
"encoding/hex" | ||
"io" | ||
"io/ioutil" | ||
"net/http" | ||
"time" | ||
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"github.com/aws/aws-sdk-go-v2/aws" | ||
v4 "github.com/aws/aws-sdk-go-v2/aws/signer/v4" | ||
"github.com/aws/aws-sdk-go-v2/config" | ||
"github.com/go-kit/log" | ||
"github.com/go-kit/log/level" | ||
) | ||
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const ( | ||
service = "es" | ||
) | ||
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type AWSSigningTransport struct { | ||
t http.RoundTripper | ||
creds aws.Credentials | ||
region string | ||
log log.Logger | ||
} | ||
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func NewAWSSigningTransport(transport http.RoundTripper, region string, log log.Logger) (*AWSSigningTransport, error) { | ||
cfg, err := config.LoadDefaultConfig(context.Background(), config.WithRegion(region)) | ||
if err != nil { | ||
_ = level.Error(log).Log("msg", "fail to load aws default config", "err", err) | ||
return nil, err | ||
} | ||
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creds, err := cfg.Credentials.Retrieve(context.Background()) | ||
if err != nil { | ||
_ = level.Error(log).Log("msg", "fail to retrive aws credentials", "err", err) | ||
return nil, err | ||
} | ||
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return &AWSSigningTransport{ | ||
t: transport, | ||
region: region, | ||
creds: creds, | ||
log: log, | ||
}, err | ||
} | ||
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func (a *AWSSigningTransport) RoundTrip(req *http.Request) (*http.Response, error) { | ||
signer := v4.NewSigner() | ||
payloadHash, newReader, err := hashPayload(req.Body) | ||
if err != nil { | ||
_ = level.Error(a.log).Log("msg", "fail to hash request body", "err", err) | ||
return nil, err | ||
} | ||
req.Body = newReader | ||
err = signer.SignHTTP(context.Background(), a.creds, req, payloadHash, service, a.region, time.Now()) | ||
if err != nil { | ||
_ = level.Error(a.log).Log("msg", "fail to sign request body", "err", err) | ||
return nil, err | ||
} | ||
return a.t.RoundTrip(req) | ||
} | ||
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func hashPayload(r io.ReadCloser) (string, io.ReadCloser, error) { | ||
var newReader io.ReadCloser | ||
payload := []byte("") | ||
if r != nil { | ||
defer r.Close() | ||
payload, err := ioutil.ReadAll(r) | ||
if err != nil { | ||
return "", newReader, err | ||
} | ||
newReader = ioutil.NopCloser(bytes.NewReader(payload)) | ||
} | ||
hash := sha256.Sum256(payload) | ||
payloadHash := hex.EncodeToString(hash[:]) | ||
return payloadHash, newReader, nil | ||
} |