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engine.go
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engine.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"
"net/url"
"github.com/keybase/client/go/libkb"
)
type Prereqs struct {
Session bool
Device bool
}
type Engine interface {
Run(ctx *Context) error
Prereqs() Prereqs
libkb.UIConsumer
G() *libkb.GlobalContext
}
func runPrereqs(e Engine, ctx *Context) (err error) {
prq := e.Prereqs()
if prq.Session {
var ok bool
ok, err = IsLoggedIn(e, ctx)
if !ok {
urlError, isURLError := err.(*url.Error)
context := ""
if isURLError {
context = fmt.Sprintf("Encountered a network error: %s", urlError.Err)
}
err = libkb.LoginRequiredError{Context: context}
}
if err != nil {
return err
}
}
if prq.Device {
var ok bool
ok, err = IsProvisioned(e, ctx)
if err != nil {
return err
}
if !ok {
err = libkb.DeviceRequiredError{}
return err
}
}
return
}
func RunEngine(e Engine, ctx *Context) (err error) {
e.G().Log.Debug("+ RunEngine(%s)", e.Name())
defer func() { e.G().Log.Debug("- RunEngine(%s) -> %s", e.Name(), libkb.ErrToOk(err)) }()
if err = delegateUIs(e, ctx); err != nil {
return err
}
if err = check(e, ctx); err != nil {
return err
}
if err = runPrereqs(e, ctx); err != nil {
return err
}
err = e.Run(ctx)
return err
}
func delegateUIs(e Engine, ctx *Context) error {
if e.G().UIRouter == nil {
return nil
}
// currently, only doing this for SecretUI, but in future,
// perhaps should iterate over all registered UIs in UIRouter.
if !requiresUI(e, ctx, libkb.SecretUIKind) {
return nil
}
ui, err := e.G().UIRouter.GetSecretUI()
if err != nil {
return err
}
if ui != nil {
e.G().Log.Debug("using delegated secret UI for engine %q", e.Name())
ctx.SecretUI = ui
}
return nil
}
func check(c libkb.UIConsumer, ctx *Context) error {
if err := checkUI(c, ctx); err != nil {
return CheckError{fmt.Sprintf("%s: %s", c.Name(), err)}
}
for _, sub := range c.SubConsumers() {
if err := check(sub, ctx); err != nil {
return CheckError{fmt.Sprintf("%s: %s", sub.Name(), err)}
}
}
return nil
}
func checkUI(c libkb.UIConsumer, ctx *Context) error {
for _, ui := range c.RequiredUIs() {
if !ctx.HasUI(ui) {
return CheckError{fmt.Sprintf("requires ui %q", ui)}
}
}
return nil
}
func requiresUI(c libkb.UIConsumer, ctx *Context, kind libkb.UIKind) bool {
for _, ui := range c.RequiredUIs() {
if ui == kind {
return true
}
}
for _, sub := range c.SubConsumers() {
if requiresUI(sub, ctx, kind) {
return true
}
}
return false
}