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device_clone_state.go
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device_clone_state.go
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// Copyright 2018 Keybase, Inc. All rights reserved. Use of
// this source code is governed by the included BSD license.
package libkb
import (
"fmt"
)
const (
DefaultCloneTokenValue string = "00000000000000000000000000000000"
)
type DeviceCloneState struct {
Prior string
Stage string
Clones int
}
type DeviceCloneStateJSONFile struct {
*JSONFile
}
type cloneDetectionResponse struct {
AppStatusEmbed
Token string `json:"token"`
Clones int `json:"clones"`
}
func (d DeviceCloneState) IsClone() bool {
return d.Clones > 1
}
func UpdateDeviceCloneState(m MetaContext) (before, after int, err error) {
d, err := GetDeviceCloneState(m)
if err != nil {
return 0, 0, err
}
before = d.Clones
prior, stage := d.Prior, d.Stage
if prior == "" {
// first run
prior = DefaultCloneTokenValue
}
if stage == "" {
stage, err = RandHexString("", 16)
if err != nil {
return 0, 0, err
}
if err = SetDeviceCloneState(m, DeviceCloneState{Prior: prior, Stage: stage, Clones: d.Clones}); err != nil {
return 0, 0, err
}
}
// POST these tokens to the server
arg := APIArg{
Endpoint: "device/clone_detection_token",
SessionType: APISessionTypeREQUIRED,
Args: HTTPArgs{
"device_id": m.G().ActiveDevice.DeviceID(),
"prior": S{Val: prior},
"stage": S{Val: stage},
},
}
var res cloneDetectionResponse
if err = m.G().API.PostDecode(m, arg, &res); err != nil {
return 0, 0, err
}
after = res.Clones
err = SetDeviceCloneState(m, DeviceCloneState{Prior: res.Token, Stage: "", Clones: after})
return before, after, err
}
func deviceCloneJSONPaths(m MetaContext) (string, string, string) {
deviceID := m.G().ActiveDevice.DeviceID()
p := fmt.Sprintf("%s.prior", deviceID)
s := fmt.Sprintf("%s.stage", deviceID)
c := fmt.Sprintf("%s.clones", deviceID)
return p, s, c
}
func GetDeviceCloneState(m MetaContext) (state DeviceCloneState, err error) {
reader, err := newDeviceCloneStateReader(m)
if err != nil {
return state, err
}
pPath, sPath, cPath := deviceCloneJSONPaths(m)
p, _ := reader.GetStringAtPath(pPath)
s, _ := reader.GetStringAtPath(sPath)
c, _ := reader.GetIntAtPath(cPath)
if c < 1 {
c = 1
}
state = DeviceCloneState{Prior: p, Stage: s, Clones: c}
m.Debug("GetDeviceCloneState: %+v", state)
return state, nil
}
func SetDeviceCloneState(m MetaContext, d DeviceCloneState) error {
m.Debug("SetDeviceCloneState: %+v", d)
writer, err := newDeviceCloneStateWriter(m)
if err != nil {
return err
}
tx, err := writer.BeginTransaction()
if err != nil {
return err
}
// From this point on, if there's an error, we abort the
// transaction.
defer func() {
if tx != nil {
err := tx.Rollback()
if err != nil {
m.Debug("SetDeviceCloneState: rollback error: %+v", err)
}
err = tx.Abort()
if err != nil {
m.Debug("SetDeviceCloneState: abort error: %+v", err)
}
}
}()
pPath, sPath, cPath := deviceCloneJSONPaths(m)
if err = writer.SetStringAtPath(pPath, d.Prior); err != nil {
return err
}
if err = writer.SetStringAtPath(sPath, d.Stage); err != nil {
return err
}
if err = writer.SetIntAtPath(cPath, d.Clones); err != nil {
return err
}
if err = tx.Commit(); err != nil {
return err
}
// Zero out the TX so that we don't abort it in the defer()
tx = nil
return nil
}
func newDeviceCloneStateReader(m MetaContext) (*DeviceCloneStateJSONFile, error) {
f := DeviceCloneStateJSONFile{NewJSONFile(m.G(), m.G().Env.GetDeviceCloneStateFilename(), "device clone state")}
err := f.Load(false)
return &f, err
}
func newDeviceCloneStateWriter(m MetaContext) (*DeviceCloneStateJSONFile, error) {
f := DeviceCloneStateJSONFile{NewJSONFile(m.G(), m.G().Env.GetDeviceCloneStateFilename(), "device clone state")}
err := f.Load(false)
return &f, err
}