1 // Copyright 2019 Google LLC All Rights Reserved. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package transport 16 17 import ( 18 "net/http" 19 20 "github.com/google/go-containerregistry/pkg/name" 21 ) 22 23 type schemeTransport struct { 24 // Scheme we should use, determined by ping response. 25 scheme string 26 27 // Registry we're talking to. 28 registry name.Registry 29 30 // Wrapped by schemeTransport. 31 inner http.RoundTripper 32 } 33 34 // RoundTrip implements http.RoundTripper 35 func (st *schemeTransport) RoundTrip(in *http.Request) (*http.Response, error) { 36 // When we ping() the registry, we determine whether to use http or https 37 // based on which scheme was successful. That is only valid for the 38 // registry server and not e.g. a separate token server or blob storage, 39 // so we should only override the scheme if the host is the registry. 40 if matchesHost(st.registry.String(), in, st.scheme) { 41 in.URL.Scheme = st.scheme 42 } 43 return st.inner.RoundTrip(in) 44 } 45