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cf_auth_middleware.go
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cf_auth_middleware.go
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package auth
import (
"encoding/json"
"fmt"
"net/http"
"time"
"github.com/cloudfoundry/metric-store-release/src/internal/metrics"
"github.com/cloudfoundry/metric-store-release/src/pkg/logger"
"github.com/golang/protobuf/jsonpb"
"github.com/gorilla/mux"
)
type CFAuthMiddlewareProvider struct {
log *logger.Logger
metrics metrics.Registrar
oauth2Reader Oauth2ClientReader
logAuthorizer LogAuthorizer
queryParser QueryParser
marshaller jsonpb.Marshaler
}
type Oauth2ClientContext struct {
IsAdmin bool
Token string
ExpiresAt time.Time
}
func NewCFAuthMiddlewareProvider(
oauth2Reader Oauth2ClientReader,
logAuthorizer LogAuthorizer,
queryParser QueryParser,
metrics metrics.Registrar,
log *logger.Logger,
) CFAuthMiddlewareProvider {
return CFAuthMiddlewareProvider{
oauth2Reader: oauth2Reader,
logAuthorizer: logAuthorizer,
queryParser: queryParser,
metrics: metrics,
log: log,
}
}
type promqlErrorBody struct {
Status string `json:"status"`
ErrorType string `json:"errorType"`
Error string `json:"error"`
}
type queryError struct {
promqlErrorBody
Data interface{} `json:"data"`
Warnings []string `json:"warnings"`
}
func (m CFAuthMiddlewareProvider) Middleware(h http.Handler) http.Handler {
router := mux.NewRouter()
router.HandleFunc("/api/v1/{subpath:query|query_range}", func(w http.ResponseWriter, r *http.Request) {
start := time.Now()
authToken := r.Header.Get("Authorization")
if authToken == "" {
m.writeQueryError(w, http.StatusNotFound, "missing auth token")
return
}
userContext, err := m.oauth2Reader.Read(authToken)
if err != nil {
m.log.Error("failed to read from Oauth2 server", err)
m.writeQueryError(w, http.StatusNotFound, "failed to read from Oauth2 server")
return
}
if !userContext.IsAdmin {
query := r.URL.Query().Get("query")
relevantSourceIds, err := m.queryParser.ExtractSourceIds(query)
if err != nil {
m.writeQueryError(w, http.StatusUnprocessableEntity, "query parse error: %s", err)
return
}
if !m.authorized(relevantSourceIds, userContext) {
m.writeQueryError(w, http.StatusUnauthorized, "there are no matching source IDs for your query")
return
}
}
h.ServeHTTP(w, r)
totalQueryTime := time.Since(start).Seconds()
m.metrics.Histogram(metrics.AuthProxyRequestDurationSeconds).Observe(float64(totalQueryTime))
})
router.HandleFunc("/api/v1/labels", func(w http.ResponseWriter, r *http.Request) {
m.handleOnlyAdmin(h, w, r)
})
router.HandleFunc("/api/v1/series", func(w http.ResponseWriter, r *http.Request) {
m.handleOnlyAdmin(h, w, r)
})
router.HandleFunc("/api/v1/rules", func(w http.ResponseWriter, r *http.Request) {
m.handleOnlyAdmin(h, w, r)
})
router.HandleFunc("/api/v1/alerts", func(w http.ResponseWriter, r *http.Request) {
m.handleOnlyAdmin(h, w, r)
})
router.HandleFunc(`/api/v1/label/{metric_name:[^/]*}/values`, func(w http.ResponseWriter, r *http.Request) {
m.handleOnlyAdmin(h, w, r)
})
router.HandleFunc("/health", h.ServeHTTP)
router.PathPrefix("/rules/").HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
m.handleOnlyAdmin(h, w, r)
})
return router
}
func (m CFAuthMiddlewareProvider) authorized(sourceIds []string, c Oauth2ClientContext) bool {
for _, sourceId := range sourceIds {
if !m.logAuthorizer.IsAuthorized(sourceId, c.Token) {
return false
}
}
return true
}
func (m CFAuthMiddlewareProvider) handleOnlyAdmin(h http.Handler, w http.ResponseWriter, r *http.Request) {
authToken := r.Header.Get("Authorization")
userContext, err := m.oauth2Reader.Read(authToken)
if err != nil {
m.log.Error("failed to read from Oauth2 server", err)
m.writeQueryError(w, http.StatusNotFound, "failed to read from Oauth2 server")
return
}
if userContext.IsAdmin {
h.ServeHTTP(w, r)
return
}
m.writeQueryError(w, http.StatusNotFound, "")
}
func (m CFAuthMiddlewareProvider) writeQueryError(w http.ResponseWriter, statusCode int, errFmt string, a ...interface{}) {
e := queryError{
promqlErrorBody: promqlErrorBody{
Status: "error",
ErrorType: http.StatusText(statusCode),
Error: fmt.Sprintf(errFmt, a...),
},
Warnings: []string{},
}
result, err := json.Marshal(e)
if err != nil {
m.log.Error("query error message marshalling failure", err)
result = []byte(e.Error)
}
http.Error(w, string(result), statusCode)
}