Merge branch '21285-max-gw-tunnels'

[arvados.git] / services / ws / permission.go

diff --git a/services/ws/permission.go b/services/ws/permission.go
index e467e067205a765ef9bd097c5d95ceda65037abb..f71ca61167dc70d7dded2623e6edfde6c1f3cb7c 100644 (file)
--- a/services/ws/permission.go
+++ b/services/ws/permission.go
@@ -1,11 +1,17 @@
-package main
+// Copyright (C) The Arvados Authors. All rights reserved.
+//
+// SPDX-License-Identifier: AGPL-3.0
+
+package ws
 
 import (
+       "context"
        "net/http"
        "net/url"
        "time"
 
-       "git.curoverse.com/arvados.git/sdk/go/arvados"
+       "git.arvados.org/arvados.git/sdk/go/arvados"
+       "git.arvados.org/arvados.git/sdk/go/ctxlog"
 )
 
 const (
@@ -15,13 +21,13 @@ const (
 
 type permChecker interface {
        SetToken(token string)
-       Check(uuid string) (bool, error)
+       Check(ctx context.Context, uuid string) (bool, error)
 }
 
-func newPermChecker(ac arvados.Client) permChecker {
-       ac.AuthToken = ""
+func newPermChecker(ac *arvados.Client) permChecker {
        return &cachingPermChecker{
-               Client:     &ac,
+               ac:         ac,
+               token:      "-",
                cache:      make(map[string]cacheEnt),
                maxCurrent: 16,
        }
@@ -33,18 +39,28 @@ type cacheEnt struct {
 }
 
 type cachingPermChecker struct {
-       *arvados.Client
+       ac         *arvados.Client
+       token      string
        cache      map[string]cacheEnt
        maxCurrent int
+
+       nChecks  uint64
+       nMisses  uint64
+       nInvalid uint64
 }
 
 func (pc *cachingPermChecker) SetToken(token string) {
-       pc.Client.AuthToken = token
+       if pc.token == token {
+               return
+       }
+       pc.token = token
+       pc.cache = make(map[string]cacheEnt)
 }
 
-func (pc *cachingPermChecker) Check(uuid string) (bool, error) {
-       logger := logger(nil).
-               WithField("token", pc.Client.AuthToken).
+func (pc *cachingPermChecker) Check(ctx context.Context, uuid string) (bool, error) {
+       pc.nChecks++
+       logger := ctxlog.FromContext(ctx).
+               WithField("token", pc.token).
                WithField("uuid", uuid)
        pc.tidy()
        now := time.Now()
@@ -52,26 +68,32 @@ func (pc *cachingPermChecker) Check(uuid string) (bool, error) {
                logger.WithField("allowed", perm.allowed).Debug("cache hit")
                return perm.allowed, nil
        }
-       var buf map[string]interface{}
-       path, err := pc.PathForUUID("get", uuid)
+
+       path, err := pc.ac.PathForUUID("get", uuid)
        if err != nil {
+               pc.nInvalid++
                return false, err
        }
-       err = pc.RequestAndDecode(&buf, "GET", path, nil, url.Values{
-               "select": {`["uuid"]`},
+
+       pc.nMisses++
+       ctx = arvados.ContextWithAuthorization(ctx, "Bearer "+pc.token)
+       ctx, cancel := context.WithDeadline(ctx, time.Now().Add(time.Minute))
+       defer cancel()
+       var buf map[string]interface{}
+       err = pc.ac.RequestAndDecodeContext(ctx, &buf, "GET", path, nil, url.Values{
+               "include_trash": {"true"},
+               "select":        {`["uuid"]`},
        })
 
        var allowed bool
        if err == nil {
                allowed = true
-       } else if txErr, ok := err.(*arvados.TransactionError); ok && txErr.StatusCode == http.StatusNotFound {
-               allowed = false
-       } else if txErr.StatusCode == http.StatusForbidden {
-               // Some requests are expressly forbidden for reasons
-               // other than "you aren't allowed to know whether this
-               // UUID exists" (404).
+       } else if txErr, ok := err.(*arvados.TransactionError); ok && pc.isNotAllowed(txErr.StatusCode) {
                allowed = false
        } else {
+               // If "context deadline exceeded", "client
+               // disconnected", HTTP 5xx, network error, etc., don't
+               // cache the result.
                logger.WithError(err).Error("lookup error")
                return false, err
        }
@@ -80,6 +102,15 @@ func (pc *cachingPermChecker) Check(uuid string) (bool, error) {
        return allowed, nil
 }
 
+func (pc *cachingPermChecker) isNotAllowed(status int) bool {
+       switch status {
+       case http.StatusForbidden, http.StatusUnauthorized, http.StatusNotFound:
+               return true
+       default:
+               return false
+       }
+}
+
 func (pc *cachingPermChecker) tidy() {
        if len(pc.cache) <= pc.maxCurrent*2 {
                return