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// Copyright 2013 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package apiserver
import (
stderrors "errors"
"sync"
"launchpad.net/juju-core/errors"
"launchpad.net/juju-core/rpc"
"launchpad.net/juju-core/state"
"launchpad.net/juju-core/state/api/params"
"launchpad.net/juju-core/state/apiserver/common"
"launchpad.net/juju-core/state/presence"
)
func newStateServer(srv *Server, rpcConn *rpc.Conn, loginCallback func(string)) *initialRoot {
r := &initialRoot{
srv: srv,
rpcConn: rpcConn,
}
r.admin = &srvAdmin{
root: r,
loginCallback: loginCallback,
}
return r
}
// initialRoot implements the API that a client first sees
// when connecting to the API. We start serving a different
// API once the user has logged in.
type initialRoot struct {
srv *Server
rpcConn *rpc.Conn
admin *srvAdmin
}
// Admin returns an object that provides API access
// to methods that can be called even when not
// authenticated.
func (r *initialRoot) Admin(id string) (*srvAdmin, error) {
if id != "" {
// Safeguard id for possible future use.
return nil, common.ErrBadId
}
return r.admin, nil
}
// srvAdmin is the only object that unlogged-in
// clients can access. It holds any methods
// that are needed to log in.
type srvAdmin struct {
mu sync.Mutex
root *initialRoot
loggedIn bool
loginCallback func(string)
}
var errAlreadyLoggedIn = stderrors.New("already logged in")
// Login logs in with the provided credentials.
// All subsequent requests on the connection will
// act as the authenticated user.
func (a *srvAdmin) Login(c params.Creds) error {
a.mu.Lock()
defer a.mu.Unlock()
if a.loggedIn {
// This can only happen if Login is called concurrently.
return errAlreadyLoggedIn
}
entity, err := checkCreds(a.root.srv.state, c)
if err != nil {
return err
}
if a.loginCallback != nil {
a.loginCallback(entity.Tag())
}
// We have authenticated the user; now choose an appropriate API
// to serve to them.
newRoot, err := a.apiRootForEntity(entity, c)
if err != nil {
return err
}
a.root.rpcConn.Serve(newRoot, serverError)
return nil
}
func checkCreds(st *state.State, c params.Creds) (taggedAuthenticator, error) {
entity0, err := st.FindEntity(c.AuthTag)
if err != nil && !errors.IsNotFoundError(err) {
return nil, err
}
// We return the same error when an entity
// does not exist as for a bad password, so that
// we don't allow unauthenticated users to find information
// about existing entities.
entity, ok := entity0.(taggedAuthenticator)
if !ok {
return nil, common.ErrBadCreds
}
if err != nil || !entity.PasswordValid(c.Password) {
return nil, common.ErrBadCreds
}
return entity, nil
}
// machinePinger wraps a presence.Pinger.
type machinePinger struct {
*presence.Pinger
}
// Stop implements Pinger.Stop() as Pinger.Kill(), needed at
// connection closing time to properly stop the wrapped pinger.
func (p *machinePinger) Stop() error {
if err := p.Pinger.Stop(); err != nil {
return err
}
return p.Pinger.Kill()
}
func (a *srvAdmin) apiRootForEntity(entity taggedAuthenticator, c params.Creds) (interface{}, error) {
// TODO(rog) choose appropriate object to serve.
newRoot := newSrvRoot(a.root, entity)
// If this is a machine agent connecting, we need to check the
// nonce matches, otherwise the wrong agent might be trying to
// connect.
machine, ok := entity.(*state.Machine)
if ok {
if !machine.CheckProvisioned(c.Nonce) {
return nil, state.NotProvisionedError(machine.Id())
}
}
setAgentAliver, ok := entity.(interface {
SetAgentAlive() (*presence.Pinger, error)
})
if ok {
// A machine or unit agent has connected, so start a pinger to
// announce it's now alive.
pinger, err := setAgentAliver.SetAgentAlive()
if err != nil {
return nil, err
}
newRoot.resources.Register(&machinePinger{pinger})
}
return newRoot, nil
}
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