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package s3
import (
"crypto/md5"
"encoding/base64"
"net/http"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/aws/request"
)
var errSSERequiresSSL = awserr.New("ConfigError", "cannot send SSE keys over HTTP.", nil)
func validateSSERequiresSSL(r *request.Request) {
if r.HTTPRequest.URL.Scheme == "https" {
return
}
if iface, ok := r.Params.(sseCustomerKeyGetter); ok {
if len(iface.getSSECustomerKey()) > 0 {
r.Error = errSSERequiresSSL
return
}
}
if iface, ok := r.Params.(copySourceSSECustomerKeyGetter); ok {
if len(iface.getCopySourceSSECustomerKey()) > 0 {
r.Error = errSSERequiresSSL
return
}
}
}
const (
sseKeyHeader = "x-amz-server-side-encryption-customer-key"
sseKeyMD5Header = sseKeyHeader + "-md5"
)
func computeSSEKeyMD5(r *request.Request) {
var key string
if g, ok := r.Params.(sseCustomerKeyGetter); ok {
key = g.getSSECustomerKey()
}
computeKeyMD5(sseKeyHeader, sseKeyMD5Header, key, r.HTTPRequest)
}
const (
copySrcSSEKeyHeader = "x-amz-copy-source-server-side-encryption-customer-key"
copySrcSSEKeyMD5Header = copySrcSSEKeyHeader + "-md5"
)
func computeCopySourceSSEKeyMD5(r *request.Request) {
var key string
if g, ok := r.Params.(copySourceSSECustomerKeyGetter); ok {
key = g.getCopySourceSSECustomerKey()
}
computeKeyMD5(copySrcSSEKeyHeader, copySrcSSEKeyMD5Header, key, r.HTTPRequest)
}
func computeKeyMD5(keyHeader, keyMD5Header, key string, r *http.Request) {
if len(key) == 0 {
// Backwards compatiablity where user just set the header value instead
// of using the API parameter, or setting the header value for an
// operation without the parameters modeled.
key = r.Header.Get(keyHeader)
if len(key) == 0 {
return
}
// In backwards compatible, the header's value is not base64 encoded,
// and needs to be encoded and updated by the SDK's customizations.
b64Key := base64.StdEncoding.EncodeToString([]byte(key))
r.Header.Set(keyHeader, b64Key)
}
// Only update Key's MD5 if not already set.
if len(r.Header.Get(keyMD5Header)) == 0 {
sum := md5.Sum([]byte(key))
keyMD5 := base64.StdEncoding.EncodeToString(sum[:])
r.Header.Set(keyMD5Header, keyMD5)
}
}