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// Copyright 2019 Aporeto 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 bahamut
import (
"net/http"
"strconv"
"strings"
"go.aporeto.io/elemental"
"go.uber.org/zap"
)
// Various common errors
var (
ErrNotFound = elemental.NewError("Not Found", "Unable to find the requested resource", "bahamut", http.StatusNotFound)
ErrRateLimit = elemental.NewError("Rate Limit", "You have exceeded your rate limit", "bahamut", http.StatusTooManyRequests)
)
func setCommonHeader(w http.ResponseWriter, origin string, encoding elemental.EncodingType) {
if origin == "" {
origin = "*"
}
w.Header().Set("Accept", "application/msgpack,application/json")
if encoding == elemental.EncodingTypeJSON {
w.Header().Set("Content-Type", string(encoding)+"; charset=UTF-8")
} else {
w.Header().Set("Content-Type", string(encoding))
}
w.Header().Set("X-Frame-Options", "SAMEORIGIN")
w.Header().Set("Cache-control", "private, no-transform")
w.Header().Set("Strict-Transport-Security", "max-age=31536000; includeSubDomains")
w.Header().Set("Access-Control-Allow-Origin", origin)
w.Header().Set("Access-Control-Expose-Headers", "X-Requested-With, X-Count-Total, X-Namespace, X-Messages, X-Fields")
w.Header().Set("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, PATCH, HEAD, OPTIONS")
w.Header().Set("Access-Control-Allow-Headers", "Authorization, Accept, Content-Type, Cache-Control, If-Modified-Since, X-Requested-With, X-Count-Total, X-Namespace, X-External-Tracking-Type, X-External-Tracking-ID, X-TLS-Client-Certificate, Accept-Encoding, X-Fields, X-Read-Consistency, X-Write-Consistency, Idempotency-Key")
w.Header().Set("Access-Control-Allow-Credentials", "true")
}
func makeCORSHandler(origin string) func(w http.ResponseWriter, r *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
o := r.Header.Get("Origin")
if origin != "" {
o = origin
}
_, writeEncoding, _ := elemental.EncodingFromHeaders(r.Header)
setCommonHeader(w, o, writeEncoding)
w.Header().Set("Access-Control-Max-Age", "1500")
w.WriteHeader(http.StatusOK)
}
}
func makeNotFoundHandler(origin string) func(w http.ResponseWriter, r *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
writeHTTPResponse(origin, w, makeErrorResponse(r.Context(), elemental.NewResponse(elemental.NewRequest()), ErrNotFound, nil))
}
}
// writeHTTPResponse writes the response into the given http.ResponseWriter.
func writeHTTPResponse(CORSOrigin string, w http.ResponseWriter, r *elemental.Response) int {
// If r is nil, we simply stop.
// It mostly means the client closed the connection and
// no response is needed.
if r == nil {
return 0
}
origin := r.Request.Headers.Get("Origin")
if CORSOrigin != "" {
origin = CORSOrigin
}
setCommonHeader(w, origin, r.Request.Accept)
if r.Redirect != "" {
w.Header().Set("Location", r.Redirect)
w.WriteHeader(http.StatusFound)
return http.StatusFound
}
w.Header().Set("X-Count-Total", strconv.Itoa(r.Total))
if len(r.Messages) > 0 {
w.Header().Set("X-Messages", strings.Join(r.Messages, ";"))
}
w.WriteHeader(r.StatusCode)
if r.Data != nil {
if _, err := w.Write(r.Data); err != nil {
zap.L().Debug("Unable to send http response to client", zap.Error(err))
}
}
return r.StatusCode
}
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