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device_keyfinder.go
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device_keyfinder.go
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// Copyright 2015 Keybase, Inc. All rights reserved. Use of
// this source code is governed by the included BSD license.
package engine
import (
"fmt"
"github.com/keybase/client/go/libkb"
"github.com/keybase/client/go/protocol"
)
// DeviceKeyfinder is an engine to find device keys for users (loaded by
// assertions), possibly tracking them if necessary.
type DeviceKeyfinder struct {
libkb.Contextified
arg DeviceKeyfinderArg
userMap map[keybase1.UID]UserPlusDeviceKeys
}
type DeviceKeyfinderArg struct {
Users []string
// If nil, no tracking is done.
Me *libkb.User
TrackOptions keybase1.TrackOptions
}
type UserPlusDeviceKeys struct {
User *libkb.User
Index int
IsTracked bool
Keys []keybase1.PublicKey
}
// NewDeviceKeyfinder creates a DeviceKeyfinder engine.
func NewDeviceKeyfinder(g *libkb.GlobalContext, arg DeviceKeyfinderArg) *DeviceKeyfinder {
return &DeviceKeyfinder{
Contextified: libkb.NewContextified(g),
arg: arg,
userMap: make(map[keybase1.UID]UserPlusDeviceKeys),
}
}
// Name is the unique engine name.
func (e *DeviceKeyfinder) Name() string {
return "DeviceKeyfinder"
}
// GetPrereqs returns the engine prereqs.
func (e *DeviceKeyfinder) Prereqs() Prereqs {
return Prereqs{}
}
// RequiredUIs returns the required UIs.
func (e *DeviceKeyfinder) RequiredUIs() []libkb.UIKind {
return []libkb.UIKind{}
}
// SubConsumers returns the other UI consumers for this engine.
func (e *DeviceKeyfinder) SubConsumers() []libkb.UIConsumer {
return []libkb.UIConsumer{
&TrackEngine{},
&Identify{},
}
}
// Run starts the engine.
func (e *DeviceKeyfinder) Run(ctx *Context) error {
err := e.verifyUsers(ctx)
if err != nil {
return err
}
err = e.loadKeys(ctx)
if err != nil {
return err
}
return nil
}
// UsersPlusDeviceKeys returns the users found while running the engine,
// plus their device keys.
func (e *DeviceKeyfinder) UsersPlusDeviceKeys() map[keybase1.UID]UserPlusDeviceKeys {
return e.userMap
}
func (e *DeviceKeyfinder) verifyUsers(ctx *Context) error {
for _, u := range e.arg.Users {
if e.arg.Me != nil {
if err := e.trackUser(ctx, u); err != nil {
return err
}
} else {
if err := e.identifyUser(ctx, u); err != nil {
return err
}
}
}
return nil
}
func (e *DeviceKeyfinder) loadKeys(ctx *Context) error {
// get the device keys for all the users
for uid, uwk := range e.userMap {
var keys []keybase1.PublicKey
ckf := uwk.User.GetComputedKeyFamily()
if ckf != nil {
keys = ckf.ExportDeviceKeys()
}
if len(keys) == 0 {
return fmt.Errorf("User %s doesn't have a device key", uwk.User.GetName())
}
uwk.Keys = keys
e.userMap[uid] = uwk
}
return nil
}
func (e *DeviceKeyfinder) trackUser(ctx *Context, username string) error {
e.G().Log.Debug("tracking user %q", username)
arg := &TrackEngineArg{
Me: e.arg.Me,
UserAssertion: username,
Options: e.arg.TrackOptions,
}
eng := NewTrackEngine(arg, e.G())
err := RunEngine(eng, ctx)
// ignore self track errors
if _, ok := err.(libkb.SelfTrackError); ok {
e.addUser(e.arg.Me, false)
return nil
}
if err != nil {
return err
}
e.addUser(eng.User(), true)
return nil
}
// PC: maybe we need to bring the TrackUI back for the
// context...so that this one can use an IdentifyUI and trackUser
// can use a TrackUI...
func (e *DeviceKeyfinder) identifyUser(ctx *Context, user string) error {
arg := NewIdentifyArg(user, false, false)
eng := NewIdentify(arg, e.G())
if err := RunEngine(eng, ctx); err != nil {
return err
}
e.addUser(eng.User(), false)
return nil
}
func (e *DeviceKeyfinder) hasUser(user *libkb.User) bool {
_, ok := e.userMap[user.GetUID()]
return ok
}
func (e *DeviceKeyfinder) addUser(user *libkb.User, tracked bool) {
if e.hasUser(user) {
return
}
index := len(e.userMap)
e.userMap[user.GetUID()] = UserPlusDeviceKeys{
User: user,
Index: index,
IsTracked: tracked,
}
}