A cloud-native LDAP server backed by a Consul datastore
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package message
import (
"fmt"
"reflect"
)
// This appendix is normative.
//
// Lightweight-Directory-Access-Protocol-V3 {1 3 6 1 1 18}
// -- Copyright (C) The Internet Society (2006). This version of
// -- this ASN.1 module is part of RFC 4511; see the RFC itself
// -- for full legal notices.
// DEFINITIONS
// IMPLICIT TAGS
// EXTENSIBILITY IMPLIED ::=
//
// BEGIN
//
// LDAPMessage ::= SEQUENCE {
// messageID MessageID,
// protocolOp CHOICE {
// bindRequest BindRequest,
// bindResponse BindResponse,
// unbindRequest UnbindRequest,
// searchRequest SearchRequest,
// searchResEntry SearchResultEntry,
// searchResDone SearchResultDone,
// searchResRef SearchResultReference,
// modifyRequest ModifyRequest,
// modifyResponse ModifyResponse,
// addRequest AddRequest,
// addResponse AddResponse,
// delRequest DelRequest,
// delResponse DelResponse,
// modDNRequest ModifyDNRequest,
// modDNResponse ModifyDNResponse,
// compareRequest CompareRequest,
// compareResponse CompareResponse,
// abandonRequest AbandonRequest,
// extendedReq ExtendedRequest,
// extendedResp ExtendedResponse,
// ...,
// intermediateResponse IntermediateResponse },
// controls [0] Controls OPTIONAL }
//
func NewLDAPMessage() *LDAPMessage { return &LDAPMessage{} }
func (message *LDAPMessage) readComponents(bytes *Bytes) (err error) {
message.messageID, err = readMessageID(bytes)
if err != nil {
err = LdapError{fmt.Sprintf("readComponents:\n%s", err.Error())}
return
}
message.protocolOp, err = readProtocolOp(bytes)
if err != nil {
err = LdapError{fmt.Sprintf("readComponents:\n%s", err.Error())}
return
}
if bytes.HasMoreData() {
var tag TagAndLength
tag, err = bytes.PreviewTagAndLength()
if err != nil {
err = LdapError{fmt.Sprintf("readComponents:\n%s", err.Error())}
return
}
if tag.Tag == TagLDAPMessageControls {
var controls Controls
controls, err = readTaggedControls(bytes, classContextSpecific, TagLDAPMessageControls)
if err != nil {
err = LdapError{fmt.Sprintf("readComponents:\n%s", err.Error())}
return
}
message.controls = controls.Pointer()
}
}
return
}
func (m *LDAPMessage) Write() (bytes *Bytes, err error) {
defer func() {
if e := recover(); e != nil {
err = LdapError{fmt.Sprintf("Error in LDAPMessage.Write: %s", e)}
}
}()
// Compute the needed size
totalSize := m.size()
// Initialize the structure
bytes = &Bytes{
bytes: make([]byte, totalSize),
offset: totalSize,
}
// Go !
size := 0
if m.controls != nil {
size += m.controls.writeTagged(bytes, classContextSpecific, TagLDAPMessageControls)
}
size += m.protocolOp.write(bytes)
size += m.messageID.write(bytes)
size += bytes.WriteTagAndLength(classUniversal, isCompound, tagSequence, size)
// Check
if size != totalSize || bytes.offset != 0 {
err = LdapError{fmt.Sprintf("Something went wrong while writing the message ! Size is %d instead of %d, final offset is %d instead of 0", size, totalSize, bytes.offset)}
}
return
}
func (m *LDAPMessage) size() (size int) {
size += m.messageID.size()
size += m.protocolOp.size()
if m.controls != nil {
size += m.controls.sizeTagged(TagLDAPMessageControls)
}
size += sizeTagAndLength(tagSequence, size)
return
}
func (l *LDAPMessage) MessageID() MessageID {
return l.messageID
}
func (l *LDAPMessage) SetMessageID(ID int) {
l.messageID = MessageID(ID)
}
func (l *LDAPMessage) Controls() *Controls {
return l.controls
}
func (l *LDAPMessage) ProtocolOp() ProtocolOp {
return l.protocolOp
}
func (l *LDAPMessage) ProtocolOpName() string {
return reflect.TypeOf(l.ProtocolOp()).Name()
}
func (l *LDAPMessage) ProtocolOpType() int {
switch l.protocolOp.(type) {
case BindRequest:
return TagBindRequest
}
return 0
}