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link.go
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link.go
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package client
import (
"encoding/json"
"fmt"
"os"
charm "github.com/charmbracelet/charm/proto"
)
// LinkGen initiates a linking session.
func (cc *Client) LinkGen(lh charm.LinkHandler) error {
s, err := cc.sshSession()
if err != nil {
return err
}
defer s.Close()
out, err := s.StdoutPipe()
if err != nil {
return err
}
in, err := s.StdinPipe()
if err != nil {
return err
}
err = s.Start("api-link")
if err != nil {
return err
}
// initialize link request on server
var lr charm.Link
dec := json.NewDecoder(out)
err = dec.Decode(&lr)
if err != nil {
return err
}
if !checkLinkStatus(lh, &lr) {
return nil
}
// waiting for link request, do we want to approve it?
err = dec.Decode(&lr)
if err != nil {
return err
}
if !checkLinkStatus(lh, &lr) {
return nil
}
// send approval response
var lm charm.Message
enc := json.NewEncoder(in)
if lh.Request(&lr) {
lm = charm.Message{Message: "yes"}
} else {
lm = charm.Message{Message: "no"}
}
err = enc.Encode(lm)
if err != nil {
return err
}
if lm.Message == "no" {
return nil
}
// get server response
err = dec.Decode(&lr)
if err != nil {
return err
}
err = cc.SyncEncryptKeys()
if err != nil {
return err
}
checkLinkStatus(lh, &lr)
return nil
}
// Link joins in on a linking session initiated by LinkGen.
func (cc *Client) Link(lh charm.LinkHandler, code string) error {
s, err := cc.sshSession()
if err != nil {
return err
}
defer s.Close()
out, err := s.StdoutPipe()
if err != nil {
return err
}
err = s.Start(fmt.Sprintf("api-link %s", code))
if err != nil {
return err
}
var lr charm.Link
dec := json.NewDecoder(out)
err = dec.Decode(&lr) // Start Request
if err != nil {
return err
}
if !checkLinkStatus(lh, &lr) {
return nil
}
err = dec.Decode(&lr) // Token Check
if err != nil {
return err
}
if !checkLinkStatus(lh, &lr) {
return nil
}
err = dec.Decode(&lr) // Results
if err != nil {
return err
}
err = cc.SyncEncryptKeys()
if err != nil {
return err
}
checkLinkStatus(lh, &lr)
return nil
}
// SyncEncryptKeys re-encodes all of the encrypt keys associated for this
// public key with all other linked public keys.
func (cc *Client) SyncEncryptKeys() error {
cc.InvalidateAuth()
eks, err := cc.EncryptKeys()
if err != nil {
return err
}
cks, err := cc.AuthorizedKeysWithMetadata()
if err != nil {
return err
}
for _, k := range cks.Keys {
for _, ek := range eks {
err := cc.addEncryptKey(k.Key, ek.ID, ek.Key, ek.CreatedAt)
if err != nil {
return err
}
}
}
return cc.deleteUserData()
}
// TODO find a better place for this, or do something more sophisticated than
// just wiping it out.
func (cc *Client) deleteUserData() error {
dd, err := DataPath(cc.Config.Host)
if err != nil {
return err
}
// TODO add any other directories that need wiping
kvd := fmt.Sprintf("%s/kv", dd)
return os.RemoveAll(kvd)
}
func checkLinkStatus(lh charm.LinkHandler, l *charm.Link) bool {
switch l.Status {
case charm.LinkStatusTokenCreated:
lh.TokenCreated(l)
case charm.LinkStatusTokenSent:
lh.TokenSent(l)
case charm.LinkStatusValidTokenRequest:
lh.ValidToken(l)
case charm.LinkStatusInvalidTokenRequest:
lh.InvalidToken(l)
return false
case charm.LinkStatusRequestDenied:
lh.RequestDenied(l)
return false
case charm.LinkStatusSameUser:
lh.SameUser(l)
case charm.LinkStatusSuccess:
lh.Success(l)
case charm.LinkStatusTimedOut:
lh.Timeout(l)
return false
case charm.LinkStatusError:
lh.Error(l)
return false
}
return true
}