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// Copyright 2019 Google LLC. 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 submission
import (
"context"
"encoding/json"
"fmt"
"html/template"
"net/http"
"os"
"strings"
"time"
ct "github.com/google/certificate-transparency-go"
"github.com/google/certificate-transparency-go/trillian/ctfe"
"github.com/google/trillian/monitoring"
)
// ProxyServer wraps Proxy and handles HTTP-requests for it.
type ProxyServer struct {
p *Proxy
addTimeout time.Duration
loadPendingLogs bool
}
// NewProxyServer creates ProxyServer instance. Call Run() to init.
func NewProxyServer(logListPath string, dBuilder DistributorBuilder, reqTimeout time.Duration, mf monitoring.MetricFactory) *ProxyServer {
s := &ProxyServer{addTimeout: reqTimeout}
s.p = NewProxy(NewLogListManager(NewLogListRefresher(logListPath), mf), dBuilder, mf)
return s
}
// Run starts regular Log list updates in the background, running until the
// context is canceled. Blocks until initialization happens.
func (s *ProxyServer) Run(ctx context.Context, logListRefreshInterval time.Duration, rootsRefreshInterval time.Duration, loadPendingLogs bool) {
s.loadPendingLogs = loadPendingLogs
s.p.Run(ctx, logListRefreshInterval, rootsRefreshInterval)
<-s.p.Init
}
// SCTBatch represents JSON response to add-pre-chain method of proxy.
type SCTBatch struct {
SCTs []ct.SignedCertificateTimestamp `json:"scts"`
}
func marshalSCTs(scts []*AssignedSCT) ([]byte, error) {
var jsonSCTsObj SCTBatch
jsonSCTsObj.SCTs = make([]ct.SignedCertificateTimestamp, 0, len(scts))
for _, sct := range scts {
jsonSCTsObj.SCTs = append(jsonSCTsObj.SCTs, *sct.SCT)
}
return json.Marshal(jsonSCTsObj)
}
// handleAddSomeChain is helper func choosing between AddChain and AddPreChain
// based on asPreChain value
func (s *ProxyServer) handleAddSomeChain(w http.ResponseWriter, r *http.Request, asPreChain bool) {
if r.Method != http.MethodPost {
http.NotFound(w, r)
return
}
addChainReq, err := ctfe.ParseBodyAsJSONChain(r)
if err != nil {
rc := http.StatusBadRequest
pre := ""
if asPreChain {
pre = "pre-"
}
http.Error(w, fmt.Sprintf("proxy: failed to parse add-%schain body: %s", pre, err), rc)
return
}
ctx, cancel := context.WithTimeout(r.Context(), s.addTimeout)
defer cancel()
var scts []*AssignedSCT
if asPreChain {
scts, err = s.p.AddPreChain(ctx, addChainReq.Chain, s.loadPendingLogs)
} else {
scts, err = s.p.AddChain(ctx, addChainReq.Chain, s.loadPendingLogs)
}
if err != nil {
http.Error(w, err.Error(), http.StatusBadGateway)
return
}
data, err := marshalSCTs(scts)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.WriteHeader(http.StatusOK)
if _, err := fmt.Fprint(w, string(data)); err != nil {
fmt.Printf("Error in fmt.Fprint: %v", err)
}
}
// HandleAddPreChain handles multiplexed add-pre-chain HTTP request.
func (s *ProxyServer) HandleAddPreChain(w http.ResponseWriter, r *http.Request) {
s.handleAddSomeChain(w, r, true /* asPreChain*/)
}
// HandleAddChain handles multiplexed add-chain HTTP request.
func (s *ProxyServer) HandleAddChain(w http.ResponseWriter, r *http.Request) {
s.handleAddSomeChain(w, r, false /* asPreChain*/)
}
func stringToHTML(s string) template.HTML {
return template.HTML(strings.ReplaceAll(template.HTMLEscapeString(string(s)), "\n", "<br>"))
}
// InfoData wraps data field required for info-page.
type InfoData struct {
PolicyName string
LogListPath template.HTML
LogListJSON template.HTML
}
// HandleInfo handles info-page request.
func (s *ProxyServer) HandleInfo(w http.ResponseWriter, r *http.Request) {
data := InfoData{
s.p.dist.policy.Name(),
stringToHTML(s.p.llWatcher.Source()),
stringToHTML(string(s.p.llWatcher.LastJSON())),
}
wd, err := os.Getwd()
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
t, err := template.ParseFiles(wd + "/submission/view/info.html")
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
if err := t.Execute(w, data); err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
}
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