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fix: Chat deletion support #258
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,113 @@ | ||
| package connector | ||
|
|
||
| import ( | ||
| "context" | ||
| "errors" | ||
| "fmt" | ||
| "math/big" | ||
|
|
||
| "maunium.net/go/mautrix/bridgev2" | ||
|
|
||
| "github.com/highesttt/matrix-line-messenger/pkg/line" | ||
| ) | ||
|
|
||
| var _ bridgev2.DeleteChatHandlingNetworkAPI = (*LineClient)(nil) | ||
|
|
||
| func (lc *LineClient) HandleMatrixDeleteChat(ctx context.Context, msg *bridgev2.MatrixDeleteChat) error { | ||
| if msg.Content.DeleteForEveryone { | ||
| return errors.New("delete for everyone is not supported on LINE") | ||
| } | ||
| chatMid := string(msg.Portal.ID) | ||
| if msg.Portal.MessageRequest { | ||
| reqSeq := lc.nextUntrackedReqSeq() | ||
| _, err := lc.callLine(ctx, func(client *line.Client) error { | ||
| return client.RejectChatInvitationContext(ctx, int64(reqSeq), chatMid) | ||
| }) | ||
| return err | ||
| } | ||
| _, boxes, err := callLineResult(lc, ctx, func(client *line.Client) (map[string]line.MessageBox, error) { | ||
| return client.GetMessageBoxesByIDsContext(ctx, []string{chatMid}) | ||
| }) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| lastDelivered := boxes[chatMid].LastDeliveredMessageID | ||
| if lastDelivered == nil || lastDelivered.MessageID == "" || lastDelivered.MessageID == "-1" { | ||
| return lc.saveChatDeletion(ctx, chatMid, "0") | ||
| } | ||
| if cutoff, ok := new(big.Int).SetString(lastDelivered.MessageID, 10); !ok || cutoff.Sign() < 0 { | ||
| return errors.New("invalid last delivered message ID") | ||
| } | ||
| reqSeq := lc.nextReqSeq() | ||
| _, err = lc.callLine(ctx, func(client *line.Client) error { | ||
| return client.SendChatRemovedContext(ctx, int64(reqSeq), chatMid, lastDelivered.MessageID, 0) | ||
| }) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| return lc.saveChatDeletion(context.WithoutCancel(ctx), chatMid, lastDelivered.MessageID) | ||
| } | ||
|
|
||
| func (lc *LineClient) chatDeletionPrefix() string { | ||
| return fmt.Sprintf("line_deleted_chat:%+q:", lc.UserLogin.ID) | ||
| } | ||
|
|
||
| func (lc *LineClient) loadChatDeletions(ctx context.Context) error { | ||
| prefix := lc.chatDeletionPrefix() | ||
| rows, err := lc.UserLogin.Bridge.DB.KV.Query(ctx, | ||
| `SELECT key, value FROM kv_store WHERE bridge_id = $1 AND substr(key, 1, $2) = $3`, | ||
| lc.UserLogin.Bridge.ID, len(prefix), prefix) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| defer rows.Close() | ||
| lc.deletedChats = make(map[string]string) | ||
| for rows.Next() { | ||
| var key, value string | ||
| if err := rows.Scan(&key, &value); err != nil { | ||
| return err | ||
| } | ||
| if cutoff, ok := new(big.Int).SetString(value, 10); !ok || cutoff.Sign() < 0 { | ||
| return errors.New("invalid stored chat deletion cutoff") | ||
| } | ||
| lc.deletedChats[key[len(prefix):]] = value | ||
| } | ||
| return rows.Err() | ||
| } | ||
|
|
||
| func (lc *LineClient) saveChatDeletion(ctx context.Context, mid, cutoff string) error { | ||
| lc.deletedChatsMu.Lock() | ||
| defer lc.deletedChatsMu.Unlock() | ||
| if previous, ok := lc.deletedChats[mid]; ok { | ||
| oldID, _ := new(big.Int).SetString(previous, 10) | ||
| newID, _ := new(big.Int).SetString(cutoff, 10) | ||
| if oldID.Cmp(newID) > 0 { | ||
| cutoff = previous | ||
| } | ||
| } | ||
| _, err := lc.UserLogin.Bridge.DB.KV.Exec(ctx, | ||
| `INSERT INTO kv_store (bridge_id, key, value) VALUES ($1, $2, $3) | ||
| ON CONFLICT (bridge_id, key) DO UPDATE SET value = $3`, | ||
| lc.UserLogin.Bridge.ID, lc.chatDeletionPrefix()+mid, cutoff) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| if lc.deletedChats == nil { | ||
| lc.deletedChats = make(map[string]string) | ||
| } | ||
| lc.deletedChats[mid] = cutoff | ||
| return nil | ||
| } | ||
|
|
||
| func (lc *LineClient) shouldSkipDeletedChat(mid, messageID string) bool { | ||
| lc.deletedChatsMu.Lock() | ||
| cutoff, deleted := lc.deletedChats[mid] | ||
| lc.deletedChatsMu.Unlock() | ||
| if !deleted { | ||
| return false | ||
| } | ||
| oldID, _ := new(big.Int).SetString(cutoff, 10) | ||
| newID, ok := new(big.Int).SetString(messageID, 10) | ||
| // Retain the cutoff after reopening so backfill cannot restore deleted history. | ||
| return !ok || newID.Cmp(oldID) <= 0 | ||
| } | ||
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