84 lines
3 KiB
Go
84 lines
3 KiB
Go
package rpc
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import (
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"crypto/sha256"
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"fmt"
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"github.com/iamxvbaba/td/bin"
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"github.com/iamxvbaba/td/tg"
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)
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// rpcRequestFingerprint 在任何自动实体补全、链接预览解析或上传媒体落库之前，
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// 对客户端原始 TL request 取稳定指纹。这样 lost-response 重放不会因服务端派生
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// photo/document id、pending webpage 状态等变化而被误判为另一条消息。
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func rpcRequestFingerprint(req bin.Encoder) ([]byte, error) {
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if req == nil {
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return nil, fmt.Errorf("fingerprint rpc request: nil request")
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}
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var b bin.Buffer
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if err := req.Encode(&b); err != nil {
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return nil, fmt.Errorf("fingerprint rpc request: %w", err)
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}
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sum := sha256.Sum256(b.Raw())
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return sum[:], nil
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}
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// sendMessageIdempotencyFingerprint fingerprints only the durable message intent.
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// clear_draft/background/update_stickersets_order are one-shot client-side delivery
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// hints: after a lost response DrKLO/TDesktop may legitimately retry the same
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// random_id without them. They must not turn an exact send replay into
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// RANDOM_ID_DUPLICATE.
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func sendMessageIdempotencyFingerprint(req *tg.MessagesSendMessageRequest) ([]byte, error) {
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if req == nil {
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return nil, fmt.Errorf("fingerprint messages.sendMessage: nil request")
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}
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clone := *req
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clone.Flags = 0
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clone.ClearDraft = false
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clone.Background = false
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clone.UpdateStickersetsOrder = false
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return rpcRequestFingerprint(&clone)
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}
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func sendMediaIdempotencyFingerprint(req *tg.MessagesSendMediaRequest) ([]byte, error) {
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if req == nil {
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return nil, fmt.Errorf("fingerprint messages.sendMedia: nil request")
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}
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clone := *req
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clone.Flags = 0
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clone.ClearDraft = false
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clone.Background = false
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clone.UpdateStickersetsOrder = false
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return rpcRequestFingerprint(&clone)
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}
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// sendMultiMediaItemIdempotencyFingerprint deliberately reduces a batch to one
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// InputSingleMedia. A retry containing only the failed subset therefore produces
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// the same fingerprint for every surviving random_id as the original batch.
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func sendMultiMediaItemIdempotencyFingerprint(req *tg.MessagesSendMultiMediaRequest, item tg.InputSingleMedia) ([]byte, error) {
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if req == nil {
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return nil, fmt.Errorf("fingerprint messages.sendMultiMedia item: nil request")
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}
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clone := *req
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clone.Flags = 0
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clone.ClearDraft = false
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clone.Background = false
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clone.UpdateStickersetsOrder = false
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clone.MultiMedia = []tg.InputSingleMedia{item}
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return rpcRequestFingerprint(&clone)
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}
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// forwardMessagesItemIdempotencyFingerprint makes the source message id and its
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// paired random_id the unit of idempotency. Hashing the full ID/RandomID vectors
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// incorrectly rejects a legal retry that contains only a failed subset.
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func forwardMessagesItemIdempotencyFingerprint(req *tg.MessagesForwardMessagesRequest, messageID int, randomID int64) ([]byte, error) {
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if req == nil {
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return nil, fmt.Errorf("fingerprint messages.forwardMessages item: nil request")
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}
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clone := *req
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clone.Flags = 0
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clone.Background = false
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clone.ID = []int{messageID}
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clone.RandomID = []int64{randomID}
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return rpcRequestFingerprint(&clone)
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}
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