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provider.go
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provider.go
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// Copyright 2023 Linka Cloud All rights reserved.
//
// 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 packages
import (
"context"
"errors"
"fmt"
"strings"
"github.com/gorilla/mux"
"go.linka.cloud/artifact-registry/pkg/storage"
)
var ErrUnknownProvider = errors.New("unknown provider")
type Provider interface {
Routes() []*Route
Repository() storage.Repository
}
type ProviderFactory func(ctx context.Context) (Provider, error)
var providers = map[string]ProviderFactory{}
func Register(name string, factory ProviderFactory) {
providers[name] = factory
}
func Providers() []string {
var ret []string
for k := range providers {
ret = append(ret, k)
}
return ret
}
func Names() []string {
var ret []string
for k := range providers {
ret = append(ret, k)
}
return ret
}
func New(ctx context.Context, name string) (Provider, error) {
f, ok := providers[name]
if !ok {
return nil, fmt.Errorf("%s: %w", name, ErrUnknownProvider)
}
return f(ctx)
}
func Init(ctx context.Context, r *mux.Router, domain, repo string) error {
for k, v := range providers {
p, err := v(ctx)
if err != nil {
return err
}
mdlw := storage.Middleware(p.Repository())("repo")
subs := []*mux.Router{r.PathPrefix("/" + k).Subrouter()}
if domain != "" {
subs = append(subs, r.Host(k+"."+domain).Subrouter())
}
for _, v := range subs {
v.Use(mdlw)
for _, vv := range p.Routes() {
p := vv.Path
if !strings.HasPrefix(p, "/") {
p = "/" + p
}
if repo == "" {
p = "/{repo:.+}" + vv.Path
}
if err := v.Path(p).Methods(vv.Method).HandlerFunc(makeHandler("", vv.Handler)).GetError(); err != nil {
return fmt.Errorf("%s: %q: %w", k, vv.Path, err)
}
}
}
}
return nil
}