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reverseproxy.go
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reverseproxy.go
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// Copyright 2018-2021 CERN
//
// 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.
//
// In applying this license, CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
package reverseproxy
import (
"encoding/json"
"net/http"
"net/http/httputil"
"net/url"
"os"
ctxpkg "github.com/cs3org/reva/v2/pkg/ctx"
"github.com/cs3org/reva/v2/pkg/rhttp/global"
"github.com/go-chi/chi/v5"
"github.com/mitchellh/mapstructure"
"github.com/rs/zerolog"
)
func init() {
global.Register("reverseproxy", New)
}
type proxyRule struct {
Endpoint string `mapstructure:"endpoint" json:"endpoint"`
Backend string `mapstructure:"backend" json:"backend"`
}
type config struct {
ProxyRulesJSON string `mapstructure:"proxy_rules_json"`
}
func (c *config) init() {
if c.ProxyRulesJSON == "" {
c.ProxyRulesJSON = "/etc/revad/proxy_rules.json"
}
}
type svc struct {
router *chi.Mux
}
// New returns an instance of the reverse proxy service
func New(m map[string]interface{}, log *zerolog.Logger) (global.Service, error) {
conf := &config{}
if err := mapstructure.Decode(m, conf); err != nil {
return nil, err
}
conf.init()
f, err := os.ReadFile(conf.ProxyRulesJSON)
if err != nil {
return nil, err
}
var rules []proxyRule
err = json.Unmarshal(f, &rules)
if err != nil {
return nil, err
}
r := chi.NewRouter()
for _, rule := range rules {
remote, err := url.Parse(rule.Backend)
if err != nil {
// Skip the rule if the backend is not a valid URL
continue
}
proxy := httputil.NewSingleHostReverseProxy(remote)
handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
r.Host = remote.Host
if token, ok := ctxpkg.ContextGetToken(r.Context()); ok {
r.Header.Set(ctxpkg.TokenHeader, token)
}
proxy.ServeHTTP(w, r)
})
r.Mount(rule.Endpoint, handler)
}
_ = chi.Walk(r, func(method string, route string, handler http.Handler, middlewares ...func(http.Handler) http.Handler) error {
log.Debug().Str("service", "reverseproxy").Str("method", method).Str("route", route).Int("middlewares", len(middlewares)).Msg("serving endpoint")
return nil
})
return &svc{router: r}, nil
}
func (s *svc) Close() error {
return nil
}
func (s *svc) Prefix() string {
// This service will be served at root
return ""
}
func (s *svc) Unprotected() []string {
// TODO: If the services which will be served via the reverse proxy have unprotected endpoints,
// we won't be able to support those at the moment.
return []string{}
}
func (s *svc) Handler() http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
s.router.ServeHTTP(w, r)
})
}