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s3_overrides.go
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/
s3_overrides.go
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// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
// See LICENSE.txt for license information.
package filestore
import (
"context"
"net/http"
"github.com/minio/minio-go/v7/pkg/credentials"
)
// customTransport is used to point the request to a different server.
// This is helpful in situations where a different service is handling AWS S3 requests
// from multiple Mattermost applications, and the Mattermost service itself does not
// have any S3 credentials.
type customTransport struct {
base http.RoundTripper
host string
scheme string
client http.Client
}
// RoundTrip implements the http.Roundtripper interface.
func (t *customTransport) RoundTrip(req *http.Request) (*http.Response, error) {
// Rountrippers should not modify the original request.
newReq := req.Clone(context.Background())
*newReq.URL = *req.URL
req.URL.Scheme = t.scheme
req.URL.Host = t.host
return t.client.Do(req)
}
// customProvider is a dummy credentials provider for the minio client to work
// without actually providing credentials. This is needed with a custom transport
// in cases where the minio client does not actually have credentials with itself,
// rather needs responses from another entity.
//
// It satisfies the credentials.Provider interface.
type customProvider struct {
isSignV2 bool
}
// Retrieve just returns empty credentials.
func (cp customProvider) Retrieve() (credentials.Value, error) {
sign := credentials.SignatureV4
if cp.isSignV2 {
sign = credentials.SignatureV2
}
return credentials.Value{
SignerType: sign,
}, nil
}
// IsExpired always returns false.
func (cp customProvider) IsExpired() bool { return false }