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client-side.go
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client-side.go
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package relay
import (
"bytes"
"context"
"encoding/base64"
"net/http"
"net/http/httptest"
"strconv"
"strings"
"net/http/httputil"
"github.com/gorilla/mux"
"gopkg.in/launchdarkly/ld-relay.v5/internal/events"
"gopkg.in/launchdarkly/ld-relay.v5/internal/util"
)
type contextKeyType string
const contextKey contextKeyType = "context"
type clientSideContext struct {
clientContext
allowedOrigins []string
proxy *httputil.ReverseProxy
}
func (c *clientSideContext) AllowedOrigins() []string {
return c.allowedOrigins
}
type clientSideMux struct {
contextByKey map[string]*clientSideContext
}
func (m clientSideMux) selectClientByUrlParam(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
envId := mux.Vars(req)["envId"]
clientCtx := m.contextByKey[envId]
if clientCtx == nil {
w.WriteHeader(http.StatusNotFound)
w.Write([]byte("ld-relay is not configured for environment id " + envId))
return
}
if clientCtx.getClient() == nil {
w.WriteHeader(http.StatusServiceUnavailable)
w.Write([]byte("client was not initialized"))
return
}
req = req.WithContext(context.WithValue(req.Context(), contextKey, clientCtx))
next.ServeHTTP(w, req)
})
}
func (m clientSideMux) getGoals(w http.ResponseWriter, req *http.Request) {
clientCtx := getClientContext(req).(*clientSideContext)
clientCtx.proxy.ServeHTTP(w, req)
}
var allowedHeadersList = []string{
"Cache-Control",
"Content-Type",
"Content-Length",
"Accept-Encoding",
"X-LaunchDarkly-User-Agent",
"X-LaunchDarkly-Payload-ID",
"X-LaunchDarkly-Wrapper",
events.EventSchemaHeader,
}
var allowedHeaders = strings.Join(allowedHeadersList, ",")
func setCorsHeaders(w http.ResponseWriter, origin string) {
w.Header().Set("Access-Control-Allow-Origin", origin)
w.Header().Set("Access-Control-Allow-Credentials", "false")
w.Header().Set("Access-Control-Max-Age", "300")
w.Header().Set("Access-Control-Allow-Headers", allowedHeaders)
w.Header().Set("Access-Control-Expose-Headers", "Date")
}
const transparent1PixelImgBase64 = "R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7="
var transparent1PixelImg []byte
func init() {
transparent1PixelImg, _ = base64.StdEncoding.DecodeString(transparent1PixelImgBase64)
}
func getEventsImage(w http.ResponseWriter, req *http.Request) {
clientCtx := getClientContext(req)
if clientCtx.getHandlers().eventDispatcher == nil {
w.WriteHeader(http.StatusServiceUnavailable)
w.Write(util.ErrorJsonMsg("Event proxy is not enabled for this environment"))
return
}
handler := clientCtx.getHandlers().eventDispatcher.GetHandler(events.JavaScriptSDKEventsEndpoint)
if handler == nil {
w.WriteHeader(http.StatusServiceUnavailable)
w.Write(util.ErrorJsonMsg("Event proxy for browser clients is not enabled for this environment"))
return
}
d := req.URL.Query().Get("d")
if d != "" {
go func() {
nullW := httptest.NewRecorder()
eventData, _ := base64.StdEncoding.DecodeString(d)
eventsReq, _ := http.NewRequest("POST", "", bytes.NewBuffer(eventData))
eventsReq.Header.Add("Content-Type", "application/json")
eventsReq.Header.Add("X-LaunchDarkly-User-Agent", eventsReq.Header.Get("X-LaunchDarkly-User-Agent"))
eventsReq.Header.Add(events.EventSchemaHeader, strconv.Itoa(events.SummaryEventsSchemaVersion))
handler(nullW, eventsReq)
}()
}
w.Header().Set("Content-Type", "image/gif")
w.Write(transparent1PixelImg)
}