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//
// Copyright (c) SAS Institute 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 server
import (
"fmt"
"net/http"
"time"
"github.com/go-chi/chi/v5"
"github.com/sassoftware/relic/v7/config"
"github.com/sassoftware/relic/v7/internal/authmodel"
"github.com/sassoftware/relic/v7/internal/realip"
"github.com/sassoftware/relic/v7/internal/zhttp"
"github.com/sassoftware/relic/v7/lib/compresshttp"
"github.com/sassoftware/relic/v7/token"
"github.com/sassoftware/relic/v7/token/open"
"github.com/sassoftware/relic/v7/token/tokencache"
"github.com/sassoftware/relic/v7/token/worker"
)
type Server struct {
Config *config.Config
Closed <-chan bool
closeCh chan<- bool
tokens map[string]token.Token
auth authmodel.Authenticator
realIP func(http.Handler) http.Handler
}
func (s *Server) Handler() http.Handler {
r := chi.NewRouter()
r.Use(s.realIP)
r.Use(zhttp.LoggingMiddleware())
r.Use(zhttp.RecoveryMiddleware)
r.Use(compresshttp.Middleware)
// unauthenticated methods
r.Get("/health", s.serveHealth)
r.Get("/directory", handleFunc(s.serveDirectory))
// authenticated methods
a := r.With(authmodel.Middleware(s.auth))
a.Get("/", handleFunc(s.serveHome))
a.Get("/list_keys", handleFunc(s.serveListKeys))
a.Get("/keys/{key}", handleFunc(s.serveGetKey))
a.Post("/sign", handleFunc(s.serveSign))
return r
}
func (s *Server) Close() error {
if s.closeCh != nil {
close(s.closeCh)
s.closeCh = nil
}
for _, t := range s.tokens {
t.Close()
}
return nil
}
func New(config *config.Config) (*Server, error) {
closed := make(chan bool)
auth, err := authmodel.New(config)
if err != nil {
return nil, fmt.Errorf("configuration authentication: %w", err)
}
realIP, err := realip.Middleware(config.Server.TrustedProxies)
if err != nil {
return nil, err
}
s := &Server{
Config: config,
Closed: closed,
closeCh: closed,
auth: auth,
realIP: realIP,
tokens: make(map[string]token.Token),
}
if err := s.openTokens(); err != nil {
for _, t := range s.tokens {
t.Close()
}
return nil, err
}
if err := s.startHealthCheck(); err != nil {
return nil, err
}
return s, nil
}
// Open each token used by any key. pkcs11 tokens get a worker, while other
// types are used in-process via a cache.
func (s *Server) openTokens() error {
expiry := time.Second * time.Duration(s.Config.Server.TokenCacheSeconds)
for _, name := range s.Config.ListServedTokens() {
tconf, err := s.Config.GetToken(name)
if err != nil {
return err
}
var tok token.Token
switch tconf.Type {
case "pkcs11":
// worker is responsible for metrics and caching
tok, err = worker.New(s.Config, name)
default:
tok, err = open.Token(s.Config, name, nil)
if err == nil {
// instrument token with metrics and caching
tok = tokencache.Metrics{Token: tok}
if tconf.RateLimit != 0 {
tok = tokencache.NewLimiter(tok, tconf.RateLimit, tconf.RateBurst)
}
tok = tokencache.New(tok, expiry)
}
}
if err != nil {
return fmt.Errorf("configuring token %q: %w", name, err)
}
s.tokens[name] = tok
}
return nil
}
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