func (s *Server) revocation(from *[32]byte, signedRevocation *pond.SignedRevocation) *pond.Reply {
account, ok := s.getAccount(from)
if !ok {
return &pond.Reply{Status: pond.Reply_NO_ACCOUNT.Enum()}
}
revocation, ok := new(bbssig.Revocation).Unmarshal(signedRevocation.Revocation.Revocation)
if !ok {
return &pond.Reply{Status: pond.Reply_CANNOT_PARSE_REVOCATION.Enum()}
}
// First check that the account doesn't have too many revocations
// stored.
revPath := account.RevocationPath()
os.MkdirAll(revPath, 0777)
revDir, err := os.Open(revPath)
if err != nil {
log.Printf("Failed to open %s: %s", revPath, err)
return &pond.Reply{Status: pond.Reply_INTERNAL_ERROR.Enum()}
}
defer revDir.Close()
ents, err := revDir.Readdir(0)
if err != nil {
log.Printf("Failed to read %s: %s", revDir, err)
return &pond.Reply{Status: pond.Reply_INTERNAL_ERROR.Enum()}
}
if len(ents) > maxRevocations {
// Delete the oldest revocation.
names := make([]string, 0, len(ents))
for _, ent := range ents {
names = append(names, ent.Name())
}
sort.Strings(names)
path := filepath.Join(revPath, names[0])
if err := os.Remove(path); err != nil {
log.Printf("Failed to remove %s: %s", path, err)
return &pond.Reply{Status: pond.Reply_INTERNAL_ERROR.Enum()}
}
}
path := filepath.Join(revPath, fmt.Sprintf("%08x", *signedRevocation.Revocation.Generation))
revBytes, err := proto.Marshal(signedRevocation)
if err != nil {
log.Printf("Failed to serialise revocation: %s", err)
return &pond.Reply{Status: pond.Reply_INTERNAL_ERROR.Enum()}
}
if err := ioutil.WriteFile(path, revBytes, 0666); err != nil {
log.Printf("Failed to write revocation file: %s", err)
return &pond.Reply{Status: pond.Reply_INTERNAL_ERROR.Enum()}
}
group := account.Group()
if group == nil {
return &pond.Reply{Status: pond.Reply_INTERNAL_ERROR.Enum()}
}
groupCopy, _ := new(bbssig.Group).Unmarshal(group.Marshal())
groupCopy.Update(revocation)
account.Lock()
defer account.Unlock()
account.group = groupCopy
groupPath := filepath.Join(account.Path(), "group")
if err := ioutil.WriteFile(groupPath, groupCopy.Marshal(), 0600); err != nil {
log.Printf("failed to write group file: %s", err)
}
return nil
}
