forked from uber/kraken
/
server.go
140 lines (127 loc) · 3.88 KB
/
server.go
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// Copyright (c) 2016-2019 Uber Technologies, Inc.
//
// 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.
package registryoverride
import (
"encoding/json"
"fmt"
"io"
"net/http"
"net/url"
"strconv"
"strings"
"github.com/pressly/chi"
"github.com/uber/kraken/build-index/tagclient"
"github.com/uber/kraken/utils/handler"
"github.com/uber/kraken/utils/listener"
"github.com/uber/kraken/utils/log"
"github.com/uber/kraken/utils/stringset"
)
// Server overrides Docker registry endpoints.
type Server struct {
config Config
tagClient tagclient.Client
}
// NewServer creates a new Server.
func NewServer(config Config, tagClient tagclient.Client) *Server {
return &Server{config, tagClient}
}
// Handler returns a handler for s.
func (s *Server) Handler() http.Handler {
r := chi.NewRouter()
r.Get("/v2/_catalog", handler.Wrap(s.catalogHandler))
return r
}
// ListenAndServe is a blocking call which runs s.
func (s *Server) ListenAndServe() error {
log.Infof("Starting registry override server on %s", s.config.Listener)
return listener.Serve(s.config.Listener, s.Handler())
}
type catalogResponse struct {
Repositories []string `json:"repositories"`
}
// catalogHandler handles catalog request.
// https://docs.docker.com/registry/spec/api/#pagination for more reference.
func (s *Server) catalogHandler(w http.ResponseWriter, r *http.Request) error {
limitQ := "n"
offsetQ := "last"
// Build request for ListWithPagination.
var filter tagclient.ListFilter
u := r.URL
q := u.Query()
for k, v := range q {
if len(v) != 1 {
return handler.Errorf(
"invalid query %s:%s", k, v).Status(http.StatusBadRequest)
}
switch k {
case limitQ:
limitCount, err := strconv.Atoi(v[0])
if err != nil {
return handler.Errorf(
"invalid limit %s: %s", v, err).Status(http.StatusBadRequest)
}
if limitCount == 0 {
return handler.Errorf(
"invalid limit %d", limitCount).Status(http.StatusBadRequest)
}
filter.Limit = limitCount
case offsetQ:
filter.Offset = v[0]
default:
return handler.Errorf("invalid query %s", k).Status(http.StatusBadRequest)
}
}
// List with pagination.
listResp, err := s.tagClient.ListWithPagination("", filter)
if err != nil {
return handler.Errorf("list: %s", err)
}
repos := stringset.New()
for _, tag := range listResp.Result {
parts := strings.Split(tag, ":")
if len(parts) != 2 {
log.With("tag", tag).Errorf("Invalid tag format, expected repo:tag")
continue
}
repos.Add(parts[0])
}
// Build Link for response.
offset, err := listResp.GetOffset()
if err != nil && err != io.EOF {
return handler.Errorf("invalid offset %s", err)
}
if offset != "" {
nextUrl, err := url.Parse(u.String())
if err != nil {
return handler.Errorf(
"invalid url string: %s", err).Status(http.StatusBadRequest)
}
val, err := url.ParseQuery(nextUrl.RawQuery)
if err != nil {
return handler.Errorf(
"invalid url string: %s", err).Status(http.StatusBadRequest)
}
val.Set(offsetQ, offset)
nextUrl.RawQuery = val.Encode()
// Set header (https://docs.docker.com/registry/spec/api/#pagination),
// except the host and scheme.
// Link: <<url>?n=2&last=b>; rel="next"
w.Header().Set("Link", fmt.Sprintf("%s; rel=\"next\"", nextUrl.String()))
}
resp := catalogResponse{Repositories: repos.ToSlice()}
if err := json.NewEncoder(w).Encode(&resp); err != nil {
return handler.Errorf("json encode: %s", err)
}
return nil
}