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identify_util.go
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identify_util.go
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// Copyright 2016 Keybase Inc. All rights reserved.
// Use of this source code is governed by a BSD
// license that can be found in the LICENSE file.
package tlfhandle
import (
"errors"
"fmt"
"sync"
"github.com/keybase/client/go/kbfs/idutil"
"github.com/keybase/client/go/kbfs/libcontext"
"github.com/keybase/client/go/kbfs/tlf"
kbname "github.com/keybase/client/go/kbun"
"github.com/keybase/client/go/libkb"
"github.com/keybase/client/go/protocol/keybase1"
"golang.org/x/net/context"
"golang.org/x/sync/errgroup"
)
// ExtendedIdentify is a struct to track the behavior and results of
// an identify.
type ExtendedIdentify struct {
Behavior keybase1.TLFIdentifyBehavior
// lock guards userBreaks and tlfBreaks
lock sync.Mutex
userBreaks chan keybase1.TLFIdentifyFailure
tlfBreaks *keybase1.TLFBreak
}
// UserBreak should be called when an identify call for a user has
// completed, and may (or may not) contain breaks.
func (ei *ExtendedIdentify) UserBreak(
ctx context.Context, username kbname.NormalizedUsername, uid keybase1.UID,
breaks *keybase1.IdentifyTrackBreaks) {
if ei.userBreaks == nil {
return
}
select {
case ei.userBreaks <- keybase1.TLFIdentifyFailure{
Breaks: breaks,
User: keybase1.User{
Uid: uid,
Username: string(username),
},
}:
case <-ctx.Done():
}
}
// TeamBreak should be called when an identify call for a team has
// completed, and may (or may not) contain breaks.
func (ei *ExtendedIdentify) TeamBreak(
ctx context.Context, teamID keybase1.TeamID,
breaks *keybase1.IdentifyTrackBreaks) {
if ei.userBreaks == nil {
return
}
if breaks != nil && (len(breaks.Keys) != 0 || len(breaks.Proofs) != 0) {
panic(fmt.Sprintf("Unexpected team %s breaks: %v", teamID, breaks))
}
// Otherwise just send an empty message to close the loop.
select {
case ei.userBreaks <- keybase1.TLFIdentifyFailure{
Breaks: nil,
User: keybase1.User{},
}:
case <-ctx.Done():
}
}
// OnError is called when the identify process has encountered a hard
// error.
func (ei *ExtendedIdentify) OnError(ctx context.Context) {
if ei.userBreaks == nil {
return
}
// The identify got an error, so just send a nil breaks list so
// that the goroutine waiting on the breaks can finish and the
// error can be returned.
select {
case ei.userBreaks <- keybase1.TLFIdentifyFailure{
Breaks: nil,
User: keybase1.User{},
}:
case <-ctx.Done():
}
}
func (ei *ExtendedIdentify) makeTlfBreaksIfNeeded(
ctx context.Context, numUserInTlf int) error {
if ei.userBreaks == nil {
return nil
}
ei.lock.Lock()
defer ei.lock.Unlock()
b := &keybase1.TLFBreak{}
for i := 0; i < numUserInTlf; i++ {
select {
case ub, ok := <-ei.userBreaks:
if !ok {
return errors.New("makeTlfBreaksIfNeeded called on ExtendedIdentify" +
" with closed userBreaks channel.")
}
if ub.Breaks != nil {
b.Breaks = append(b.Breaks, ub)
}
case <-ctx.Done():
return ctx.Err()
}
}
ei.tlfBreaks = b
return nil
}
// GetTlfBreakAndClose returns a keybase1.TLFBreak. This should only
// be called for behavior.WarningInsteadOfErrorOnBrokenTracks() ==
// true, and after makeTlfBreaksIfNeeded is called, to make sure user
// proof breaks get populated in GUI mode.
//
// If called otherwise, we don't panic here anymore, since we can't
// panic on nil ei.tlfBreaks. The reason is if a previous successful
// identify has already happened recently, it could cause this
// identify to be skipped, which means ei.tlfBreaks is never
// populated. In this case, it's safe to return an empty
// keybase1.TLFBreak.
func (ei *ExtendedIdentify) GetTlfBreakAndClose() keybase1.TLFBreak {
ei.lock.Lock()
defer ei.lock.Unlock()
if ei.userBreaks != nil {
close(ei.userBreaks)
ei.userBreaks = nil
}
if ei.tlfBreaks != nil {
return *ei.tlfBreaks
}
return keybase1.TLFBreak{}
}
// ctxExtendedIdentifyKeyType is a type for the context key for using
// ExtendedIdentify
type ctxExtendedIdentifyKeyType int
const (
// ctxExtendedIdentifyKeyType is a context key for using ExtendedIdentify
ctxExtendedIdentifyKey ctxExtendedIdentifyKeyType = iota
)
// ExtendedIdentifyAlreadyExists is returned when MakeExtendedIdentify is
// called on a context already with ExtendedIdentify.
type ExtendedIdentifyAlreadyExists struct{}
func (e ExtendedIdentifyAlreadyExists) Error() string {
return "extendedIdentify already exists"
}
// MakeExtendedIdentify populates a context with an ExtendedIdentify directive.
func MakeExtendedIdentify(ctx context.Context,
behavior keybase1.TLFIdentifyBehavior) (context.Context, error) {
if _, ok := ctx.Value(ctxExtendedIdentifyKey).(*ExtendedIdentify); ok {
return nil, ExtendedIdentifyAlreadyExists{}
}
if !behavior.WarningInsteadOfErrorOnBrokenTracks() {
return libcontext.NewContextReplayable(
ctx, func(ctx context.Context) context.Context {
return context.WithValue(
ctx, ctxExtendedIdentifyKey, &ExtendedIdentify{
Behavior: behavior,
})
}), nil
}
ch := make(chan keybase1.TLFIdentifyFailure)
return libcontext.NewContextReplayable(
ctx, func(ctx context.Context) context.Context {
return context.WithValue(
ctx, ctxExtendedIdentifyKey, &ExtendedIdentify{
Behavior: behavior,
userBreaks: ch,
})
}), nil
}
// GetExtendedIdentify returns the extended identify info associated
// with the given context.
func GetExtendedIdentify(ctx context.Context) (ei *ExtendedIdentify) {
if ei, ok := ctx.Value(ctxExtendedIdentifyKey).(*ExtendedIdentify); ok {
return ei
}
return &ExtendedIdentify{
Behavior: keybase1.TLFIdentifyBehavior_DEFAULT_KBFS,
}
}
// identifyUID performs identify based only on UID. It should be
// used only if the username is not known - as e.g. when rekeying.
func identifyUID(ctx context.Context, nug idutil.NormalizedUsernameGetter,
identifier idutil.Identifier, id keybase1.UserOrTeamID, t tlf.Type,
offline keybase1.OfflineAvailability) error {
name, err := nug.GetNormalizedUsername(ctx, id, offline)
if err != nil {
return err
}
return identifyUser(ctx, nug, identifier, name, id, t, offline)
}
// identifyUser is the preferred way to run identifies.
func identifyUser(ctx context.Context, nug idutil.NormalizedUsernameGetter,
identifier idutil.Identifier, name kbname.NormalizedUsername,
id keybase1.UserOrTeamID, t tlf.Type,
offline keybase1.OfflineAvailability) error {
// Check to see if identify should be skipped altogether.
ei := GetExtendedIdentify(ctx)
if ei.Behavior == keybase1.TLFIdentifyBehavior_CHAT_SKIP {
return nil
}
var reason string
nameAssertion := name.String()
isImplicit := false
switch t {
case tlf.Public:
if id.IsTeam() {
isImplicit = true
}
reason = "You accessed a public folder."
case tlf.Private:
if id.IsTeam() {
isImplicit = true
reason = fmt.Sprintf(
"You accessed a folder for private team %s.", nameAssertion)
} else {
reason = fmt.Sprintf(
"You accessed a private folder with %s.", nameAssertion)
}
case tlf.SingleTeam:
reason = fmt.Sprintf(
"You accessed a folder for private team %s.", nameAssertion)
nameAssertion = "team:" + nameAssertion
}
var resultName kbname.NormalizedUsername
var resultID keybase1.UserOrTeamID
if isImplicit {
assertions, extensionSuffix, err := tlf.SplitExtension(name.String())
if err != nil {
return err
}
iteamInfo, err := identifier.IdentifyImplicitTeam(
ctx, assertions, extensionSuffix, t, reason, offline)
if err != nil {
return err
}
resultName = iteamInfo.Name
resultID = iteamInfo.TID.AsUserOrTeam()
} else {
var err error
resultName, resultID, err =
identifier.Identify(ctx, nameAssertion, reason, offline)
if err != nil {
// Convert libkb.NoSigChainError into one we can report. (See
// KBFS-1252).
if _, ok := err.(libkb.NoSigChainError); ok {
return idutil.NoSigChainError{User: name}
}
return err
}
}
// The names of implicit teams can change out from under us,
// unlike for regular users, so don't require that they remain the
// same.
if resultName != name && !isImplicit {
return fmt.Errorf("Identify returned name=%s, expected %s",
resultName, name)
}
if resultID != id {
return fmt.Errorf("Identify returned uid=%s, expected %s", resultID, id)
}
return nil
}
// identifyUsers identifies the users in the given maps.
func identifyUsers(
ctx context.Context, nug idutil.NormalizedUsernameGetter,
identifier idutil.Identifier,
names map[keybase1.UserOrTeamID]kbname.NormalizedUsername,
t tlf.Type, offline keybase1.OfflineAvailability) error {
eg, ctx := errgroup.WithContext(ctx)
// TODO: limit the number of concurrent identifies?
// TODO: implement a version of errgroup with limited concurrency.
for id, name := range names {
// Capture range variables.
id, name := id, name
eg.Go(func() error {
return identifyUser(ctx, nug, identifier, name, id, t, offline)
})
}
return eg.Wait()
}
// IdentifyUserList identifies the users in the given list. Only use
// this when the usernames are not known - like when rekeying.
func IdentifyUserList(ctx context.Context, nug idutil.NormalizedUsernameGetter,
identifier idutil.Identifier, ids []keybase1.UserOrTeamID, t tlf.Type,
offline keybase1.OfflineAvailability) error {
eg, ctx := errgroup.WithContext(ctx)
// TODO: limit the number of concurrent identifies?
// TODO: implement concurrency limited version of errgroup.
for _, id := range ids {
// Capture range variable.
id := id
eg.Go(func() error {
return identifyUID(
ctx, nug, identifier, id, t, offline)
})
}
return eg.Wait()
}
// identifyUsersForTLF is a helper for identifyHandle for easier testing.
func identifyUsersForTLF(
ctx context.Context, nug idutil.NormalizedUsernameGetter,
identifier idutil.Identifier,
names map[keybase1.UserOrTeamID]kbname.NormalizedUsername,
t tlf.Type, offline keybase1.OfflineAvailability) error {
ei := GetExtendedIdentify(ctx)
if ei.Behavior == keybase1.TLFIdentifyBehavior_CHAT_SKIP {
return nil
}
eg, ctx := errgroup.WithContext(ctx)
eg.Go(func() error {
return ei.makeTlfBreaksIfNeeded(ctx, len(names))
})
eg.Go(func() error {
return identifyUsers(ctx, nug, identifier, names, t, offline)
})
return eg.Wait()
}
// IdentifyHandle identifies the canonical names in the given handle.
func IdentifyHandle(
ctx context.Context, nug idutil.NormalizedUsernameGetter,
identifier idutil.Identifier, osg idutil.OfflineStatusGetter,
h *Handle) error {
offline := keybase1.OfflineAvailability_NONE
if osg != nil {
offline = osg.OfflineAvailabilityForID(h.tlfID)
}
return identifyUsersForTLF(
ctx, nug, identifier, h.ResolvedUsersMap(), h.Type(), offline)
}
// IdentifySingleAssertion identifies a single assertion, and takes
// care of any necessary extended identify behaviors. It does not
// relay any broken identify warnings back to the caller, however.
func IdentifySingleAssertion(
ctx context.Context, assertion, reason string, identifier idutil.Identifier,
offline keybase1.OfflineAvailability) (
name kbname.NormalizedUsername, err error) {
ei := GetExtendedIdentify(ctx)
ctx, cancel := context.WithCancel(ctx)
defer cancel()
// Make sure to wait on any errors.
errCh := make(chan error, 1)
go func() {
errCh <- ei.makeTlfBreaksIfNeeded(ctx, 1)
}()
name, _, err = identifier.Identify(ctx, assertion, reason, offline)
if err != nil {
return "", err
}
// Wait for the goroutine to finish, but ignore the error.
select {
case <-errCh:
case <-ctx.Done():
return "", ctx.Err()
}
if ei.Behavior.WarningInsteadOfErrorOnBrokenTracks() {
_ = GetExtendedIdentify(ctx).GetTlfBreakAndClose()
}
return name, nil
}