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server.go
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server.go
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package server
import (
"encoding/json"
"errors"
"fmt"
"net/http"
"strings"
"github.com/go-chi/chi/v5"
"github.com/go-chi/chi/v5/middleware"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/redhatinsights/platform-go-middlewares/request_id"
"github.com/redhatinsights/uhc-auth-proxy/cache"
l "github.com/redhatinsights/uhc-auth-proxy/logger"
"github.com/redhatinsights/uhc-auth-proxy/requests/client"
"github.com/redhatinsights/uhc-auth-proxy/requests/cluster"
"github.com/spf13/viper"
"go.uber.org/zap"
)
var log *zap.Logger
func init() {
l.InitLogger()
log = l.Log.Named("server")
}
var (
cacheHit = promauto.NewCounter(prometheus.CounterOpts{
Name: "uhc_auth_proxy_cache_hit",
Help: "Total number of cache hits",
})
cacheMiss = promauto.NewCounter(prometheus.CounterOpts{
Name: "uhc_auth_proxy_cache_miss",
Help: "Total number of cache misses",
})
responseMetrics = promauto.NewCounterVec(prometheus.CounterOpts{
Name: "uhc_auth_proxy_responses",
Help: "Count of responses by code",
}, []string{"code"})
)
const (
insightsOperatorPrefix = `insights-operator/`
costMgmtOperatorPrefix = `cost-mgmt-operator/`
marketplaceOperatorPrefix = `marketplace-operator/`
acmOperator = `acm-operator/`
assistedInstallerOperatorPrefix = `assisted-installer-operator/`
cryostatOperatorPrefix = `cryostat-operator/`
)
var (
operatorPrefixes = [6]string{insightsOperatorPrefix, costMgmtOperatorPrefix, marketplaceOperatorPrefix, acmOperator, assistedInstallerOperatorPrefix, cryostatOperatorPrefix}
)
// returns the cluster id from the user agent string used by the support operator
// support-operator/commit cluster/cluster_id
func getClusterID(userAgent string) (string, error) {
spl := strings.SplitN(userAgent, " ", 2)
validUserAgent := false
clusterInAgent := len(spl) >= 2 && strings.HasPrefix(spl[1], `cluster/`)
for prefixIdx := range operatorPrefixes {
if strings.HasPrefix(spl[0], operatorPrefixes[prefixIdx]) && clusterInAgent {
validUserAgent = true
}
}
if !validUserAgent {
return "", fmt.Errorf("invalid user-agent: %s", userAgent)
}
return strings.TrimPrefix(spl[1], `cluster/`), nil
}
func getToken(authorizationHeader string) (string, error) {
if !strings.HasPrefix(authorizationHeader, `Bearer `) {
return "", fmt.Errorf("not a bearer token: '%s'", authorizationHeader)
}
return strings.TrimPrefix(authorizationHeader, `Bearer `), nil
}
func makeKey(r cluster.Registration) (string, error) {
if r.ClusterID != "" && r.AuthorizationToken != "" {
return fmt.Sprintf("%s:%s", r.ClusterID, r.AuthorizationToken), nil
}
return "", errors.New("cannot make a key with an incomplete cluster.Registration struct")
}
// RootHandler returns a handler that uses the given client and token
func RootHandler(wrapper client.Wrapper) func(w http.ResponseWriter, r *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
reqID := r.Header.Get("x-rh-insights-request-id")
logr := log.With(zap.String("request_id_header", reqID), zap.String("req_id", request_id.GetReqID(r.Context())))
var respond = func(code int) {
w.WriteHeader(code)
responseMetrics.With(prometheus.Labels{"code": fmt.Sprintf("%d", code)}).Inc()
}
clusterID, err := getClusterID(r.Header.Get("user-agent"))
if err != nil {
logr.Error("Failed to get the cluster id", zap.Error(err))
respond(400)
fmt.Fprintf(w, "Invalid user-agent: '%s'", err.Error())
return
}
token, err := getToken(r.Header.Get("Authorization"))
if err != nil {
logr.Error("Failed to get the token", zap.Error(err))
respond(400)
fmt.Fprintf(w, "Invalid authorization header: '%s'", err.Error())
return
}
reg := cluster.Registration{
ClusterID: clusterID,
AuthorizationToken: token,
}
key, err := makeKey(reg)
if err != nil {
logr.Error("could not form a valid cluster registration object", zap.Error(err))
respond(500)
fmt.Fprintf(w, "Could not form valid cluster registration object: '%s'", err.Error())
return
}
out := cache.Get(key)
if out != nil {
cacheHit.Inc()
}
if out == nil {
cacheMiss.Inc()
ident, err := cluster.GetIdentity(wrapper, reg)
if err != nil {
fields := []zap.Field{zap.Error(err), zap.String("cluster_id", reg.ClusterID)}
getErrorSpecificFields(err, &fields)
logr.Error("could not authenticate given the credentials", fields...)
respond(getErrorStatusCode(err))
fmt.Fprintf(w, "Could not authenticate: '%s'", err.Error())
return
}
out, err = json.Marshal(ident)
if err != nil {
logr.Error("Failed to marshal identity", zap.Error(err))
respond(500)
fmt.Fprintf(w, "Unable to read identity: '%s'", err.Error())
return
}
cache.Set(key, out)
}
w.Header().Add("Content-Type", "application/json")
respond(200)
w.Write(out)
}
}
func getErrorSpecificFields(err error, fields *[]zap.Field) {
var accErr *cluster.AccountError
switch {
case errors.As(err, &accErr):
*fields = append(*fields, zap.Object("account_error_verbose", accErr))
}
}
func getErrorStatusCode(err error) int {
var httpError *client.HttpError
switch {
case errors.As(err, &httpError):
return httpError.StatusCode
default:
return 401
}
}
// StatusHandler handles a basic /status endpoint for information/ready checks
func StatusHandler(w http.ResponseWriter, r *http.Request) {
json.NewEncoder(w).Encode(map[string]string{"status": "available"})
}
// Start starts the server
func Start() {
r := chi.NewRouter()
r.Use(
request_id.ConfiguredRequestID("x-rh-insights-request-id"),
middleware.RealIP,
middleware.Logger,
middleware.Recoverer,
middleware.StripSlashes,
)
wrapper := &client.HTTPWrapper{}
handler := RootHandler(wrapper)
r.Get("/", handler)
r.Get("/api/uhc-auth-proxy/v1", handler)
r.Handle("/metrics", promhttp.Handler())
r.Get("/status", StatusHandler)
port := viper.GetInt64("SERVER_PORT")
log.Info(fmt.Sprintf("Starting server on port %d", port))
srv := http.Server{
Addr: fmt.Sprintf(":%d", port),
Handler: r,
}
if err := srv.ListenAndServe(); err != http.ErrServerClosed {
log.Error("server closed with error", zap.Error(err))
}
}