gosora/common/convos_posts.go

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package common
import (
"crypto/aes"
"crypto/cipher"
"crypto/rand"
"encoding/hex"
"io"
)
var ConvoPostProcess ConvoPostProcessor = NewDefaultConvoPostProcessor()
type ConvoPostProcessor interface {
OnLoad(co *ConversationPost) (*ConversationPost, error)
OnSave(co *ConversationPost) (*ConversationPost, error)
}
type DefaultConvoPostProcessor struct {
}
func NewDefaultConvoPostProcessor() *DefaultConvoPostProcessor {
return &DefaultConvoPostProcessor{}
}
func (pr *DefaultConvoPostProcessor) OnLoad(co *ConversationPost) (*ConversationPost, error) {
return co, nil
}
func (pr *DefaultConvoPostProcessor) OnSave(co *ConversationPost) (*ConversationPost, error) {
return co, nil
}
type AesConvoPostProcessor struct {
}
func NewAesConvoPostProcessor() *AesConvoPostProcessor {
return &AesConvoPostProcessor{}
}
func (pr *AesConvoPostProcessor) OnLoad(co *ConversationPost) (*ConversationPost, error) {
if co.Post != "aes" {
return co, nil
}
key, _ := hex.DecodeString(Config.ConvoKey)
ciphertext, err := hex.DecodeString(co.Body)
if err != nil {
return nil, err
}
block, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
aesgcm, err := cipher.NewGCM(block)
if err != nil {
return nil, err
}
nonceSize := aesgcm.NonceSize()
if len(ciphertext) < nonceSize {
return nil, err
}
nonce, ciphertext := ciphertext[:nonceSize], ciphertext[nonceSize:]
plaintext, err := aesgcm.Open(nil, nonce, ciphertext, nil)
if err != nil {
return nil, err
}
lco := *co
lco.Body = string(plaintext)
return &lco, nil
}
func (pr *AesConvoPostProcessor) OnSave(co *ConversationPost) (*ConversationPost, error) {
key, _ := hex.DecodeString(Config.ConvoKey)
block, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
nonce := make([]byte, 12)
if _, err := io.ReadFull(rand.Reader, nonce); err != nil {
return nil, err
}
aesgcm, err := cipher.NewGCM(block)
if err != nil {
return nil, err
}
ciphertext := aesgcm.Seal(nil, nonce, []byte(co.Body), nil)
lco := *co
lco.Body = hex.EncodeToString(ciphertext)
lco.Post = "aes"
return &lco, nil
}
type ConversationPost struct {
ID int
CID int
Body string
Post string // aes, ''
CreatedBy int
}
// TODO: Should we run OnLoad on this? Or maybe add a FetchMeta method to avoid having to decode the message when it's not necessary?
func (co *ConversationPost) Fetch() error {
return convoStmts.fetchPost.QueryRow(co.ID).Scan(&co.CID, &co.Body, &co.Post, &co.CreatedBy)
}
func (co *ConversationPost) Update() error {
lco, err := ConvoPostProcess.OnSave(co)
if err != nil {
return err
}
//GetHookTable().VhookNoRet("convo_post_update", lco)
_, err = convoStmts.editPost.Exec(lco.Body, lco.Post, lco.ID)
return err
}
func (co *ConversationPost) Create() (int, error) {
lco, err := ConvoPostProcess.OnSave(co)
if err != nil {
return 0, err
}
//GetHookTable().VhookNoRet("convo_post_create", lco)
res, err := convoStmts.createPost.Exec(lco.CID, lco.Body, lco.Post, lco.CreatedBy)
if err != nil {
return 0, err
}
lastID, err := res.LastInsertId()
return int(lastID), err
}
func (co *ConversationPost) Delete() error {
_, err := convoStmts.deletePost.Exec(co.ID)
return err
}