mirror of
https://github.com/edgelesssys/constellation.git
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887dcda78b
Encrypt each object with a random DEK and attach the encrypted DEK as object metadata. Encrpt the DEK with a key from the keyservice. All objects use the same KEK until a keyrotation takes place.
221 lines
7.2 KiB
Go
221 lines
7.2 KiB
Go
/*
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Copyright (c) Edgeless Systems GmbH
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SPDX-License-Identifier: AGPL-3.0-only
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*/
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package router
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import (
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"context"
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"encoding/hex"
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"io"
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"net/http"
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"net/url"
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"regexp"
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"strconv"
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"strings"
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"time"
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"github.com/aws/aws-sdk-go-v2/service/s3"
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"github.com/edgelesssys/constellation/v2/internal/logger"
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"github.com/edgelesssys/constellation/v2/s3proxy/internal/crypto"
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"go.uber.org/zap"
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)
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const (
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// dekTag is the name of the header that holds the encrypted data encryption key for the attached object. Presence of the key implies the object needs to be decrypted.
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// Use lowercase only, as AWS automatically lowercases all metadata keys.
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dekTag = "constellation-dek"
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)
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// object bundles data to implement http.Handler methods that use data from incoming requests.
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type object struct {
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kek [32]byte
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client s3Client
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key string
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bucket string
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data []byte
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query url.Values
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tags string
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contentType string
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metadata map[string]string
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objectLockLegalHoldStatus string
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objectLockMode string
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objectLockRetainUntilDate time.Time
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sseCustomerAlgorithm string
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sseCustomerKey string
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sseCustomerKeyMD5 string
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log *logger.Logger
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}
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// get is a http.HandlerFunc that implements the GET method for objects.
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func (o object) get(w http.ResponseWriter, r *http.Request) {
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o.log.With(zap.String("key", o.key), zap.String("host", o.bucket)).Debugf("getObject")
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versionID, ok := o.query["versionId"]
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if !ok {
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versionID = []string{""}
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}
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output, err := o.client.GetObject(r.Context(), o.bucket, o.key, versionID[0], o.sseCustomerAlgorithm, o.sseCustomerKey, o.sseCustomerKeyMD5)
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if err != nil {
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// log with Info as it might be expected behavior (e.g. object not found).
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o.log.With(zap.Error(err)).Errorf("GetObject sending request to S3")
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// We want to forward error codes from the s3 API to clients as much as possible.
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code := parseErrorCode(err)
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if code != 0 {
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http.Error(w, err.Error(), code)
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return
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}
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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if output.ETag != nil {
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w.Header().Set("ETag", strings.Trim(*output.ETag, "\""))
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}
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if output.Expiration != nil {
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w.Header().Set("x-amz-expiration", *output.Expiration)
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}
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if output.ChecksumCRC32 != nil {
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w.Header().Set("x-amz-checksum-crc32", *output.ChecksumCRC32)
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}
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if output.ChecksumCRC32C != nil {
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w.Header().Set("x-amz-checksum-crc32c", *output.ChecksumCRC32C)
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}
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if output.ChecksumSHA1 != nil {
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w.Header().Set("x-amz-checksum-sha1", *output.ChecksumSHA1)
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}
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if output.ChecksumSHA256 != nil {
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w.Header().Set("x-amz-checksum-sha256", *output.ChecksumSHA256)
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}
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if output.SSECustomerAlgorithm != nil {
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w.Header().Set("x-amz-server-side-encryption-customer-algorithm", *output.SSECustomerAlgorithm)
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}
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if output.SSECustomerKeyMD5 != nil {
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w.Header().Set("x-amz-server-side-encryption-customer-key-MD5", *output.SSECustomerKeyMD5)
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}
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if output.SSEKMSKeyId != nil {
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w.Header().Set("x-amz-server-side-encryption-aws-kms-key-id", *output.SSEKMSKeyId)
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}
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if output.ServerSideEncryption != "" {
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w.Header().Set("x-amz-server-side-encryption-context", string(output.ServerSideEncryption))
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}
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body, err := io.ReadAll(output.Body)
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if err != nil {
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o.log.With(zap.Error(err)).Errorf("GetObject reading S3 response")
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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plaintext := body
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rawEncryptedDEK, ok := output.Metadata[dekTag]
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if ok {
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encryptedDEK, err := hex.DecodeString(rawEncryptedDEK)
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if err != nil {
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o.log.Errorf("GetObject decoding DEK", "error", err)
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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plaintext, err = crypto.Decrypt(body, encryptedDEK, o.kek)
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if err != nil {
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o.log.With(zap.Error(err)).Errorf("GetObject decrypting response")
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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}
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w.WriteHeader(http.StatusOK)
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if _, err := w.Write(plaintext); err != nil {
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o.log.With(zap.Error(err)).Errorf("GetObject sending response")
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}
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}
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// put is a http.HandlerFunc that implements the PUT method for objects.
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func (o object) put(w http.ResponseWriter, r *http.Request) {
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ciphertext, encryptedDEK, err := crypto.Encrypt(o.data, o.kek)
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if err != nil {
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o.log.With(zap.Error(err)).Errorf("PutObject")
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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o.metadata[dekTag] = hex.EncodeToString(encryptedDEK)
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output, err := o.client.PutObject(r.Context(), o.bucket, o.key, o.tags, o.contentType, o.objectLockLegalHoldStatus, o.objectLockMode, o.sseCustomerAlgorithm, o.sseCustomerKey, o.sseCustomerKeyMD5, o.objectLockRetainUntilDate, o.metadata, ciphertext)
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if err != nil {
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o.log.With(zap.Error(err)).Errorf("PutObject sending request to S3")
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// We want to forward error codes from the s3 API to clients whenever possible.
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code := parseErrorCode(err)
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if code != 0 {
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http.Error(w, err.Error(), code)
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return
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}
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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w.Header().Set("x-amz-server-side-encryption", string(output.ServerSideEncryption))
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if output.VersionId != nil {
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w.Header().Set("x-amz-version-id", *output.VersionId)
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}
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if output.ETag != nil {
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w.Header().Set("ETag", strings.Trim(*output.ETag, "\""))
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}
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if output.Expiration != nil {
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w.Header().Set("x-amz-expiration", *output.Expiration)
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}
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if output.ChecksumCRC32 != nil {
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w.Header().Set("x-amz-checksum-crc32", *output.ChecksumCRC32)
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}
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if output.ChecksumCRC32C != nil {
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w.Header().Set("x-amz-checksum-crc32c", *output.ChecksumCRC32C)
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}
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if output.ChecksumSHA1 != nil {
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w.Header().Set("x-amz-checksum-sha1", *output.ChecksumSHA1)
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}
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if output.ChecksumSHA256 != nil {
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w.Header().Set("x-amz-checksum-sha256", *output.ChecksumSHA256)
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}
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if output.SSECustomerAlgorithm != nil {
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w.Header().Set("x-amz-server-side-encryption-customer-algorithm", *output.SSECustomerAlgorithm)
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}
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if output.SSECustomerKeyMD5 != nil {
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w.Header().Set("x-amz-server-side-encryption-customer-key-MD5", *output.SSECustomerKeyMD5)
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}
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if output.SSEKMSKeyId != nil {
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w.Header().Set("x-amz-server-side-encryption-aws-kms-key-id", *output.SSEKMSKeyId)
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}
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if output.SSEKMSEncryptionContext != nil {
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w.Header().Set("x-amz-server-side-encryption-context", *output.SSEKMSEncryptionContext)
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}
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w.WriteHeader(http.StatusOK)
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if _, err := w.Write(nil); err != nil {
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o.log.With(zap.Error(err)).Errorf("PutObject sending response")
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}
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}
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func parseErrorCode(err error) int {
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regex := regexp.MustCompile(`https response error StatusCode: (\d+)`)
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matches := regex.FindStringSubmatch(err.Error())
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if len(matches) > 1 {
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code, _ := strconv.Atoi(matches[1])
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return code
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}
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return 0
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}
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type s3Client interface {
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GetObject(ctx context.Context, bucket, key, versionID, sseCustomerAlgorithm, sseCustomerKey, sseCustomerKeyMD5 string) (*s3.GetObjectOutput, error)
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PutObject(ctx context.Context, bucket, key, tags, contentType, objectLockLegalHoldStatus, objectLockMode, sseCustomerAlgorithm, sseCustomerKey, sseCustomerKeyMD5 string, objectLockRetainUntilDate time.Time, metadata map[string]string, body []byte) (*s3.PutObjectOutput, error)
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}
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