82 lines
1.8 KiB
Go
82 lines
1.8 KiB
Go
package protocol
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import (
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"crypto/sha256"
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"encoding/binary"
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"encoding/hex"
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)
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// RequestFingerprint 计算第 7.3 节发送请求指纹（十六进制小写 SHA-256）。
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// 字段：to.kind、to.id、body.enc、content_type、解码后正文、meta（键排序）、
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// send_at_ms、delay_ms、offline.keep、offline.ttl_seconds、receipt。
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// 不含 talk_password 与 rid。meta 键顺序不影响结果。
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// receipt / offline 使用文档默认值后的有效值；缺省的 send_at_ms、delay_ms 不写入对应槽位。
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func RequestFingerprint(s *Send) (string, error) {
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raw, err := DecodeBody(s.Body)
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if err != nil {
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return "", err
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}
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metaJSON, err := MetaCanonicalJSON(s.Meta)
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if err != nil {
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return "", badRequest("invalid meta")
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}
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h := sha256.New()
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writeStr(h, s.To.Kind)
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writeStr(h, s.To.ID)
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writeStr(h, s.Body.Enc)
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writeStr(h, EffectiveContentType(s.Body))
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writeBytes(h, raw)
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writeBytes(h, metaJSON)
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writeOptInt64(h, s.SendAtMs)
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writeOptInt64(h, s.DelayMs)
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keep := EffectiveOfflineKeep(s)
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writeBool(h, keep)
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ttl := EffectiveOfflineTTL(s)
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writeInt64(h, ttl)
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writeBool(h, EffectiveReceipt(s))
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sum := h.Sum(nil)
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return hex.EncodeToString(sum), nil
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}
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type hashWriter interface {
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Write(p []byte) (int, error)
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}
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func writeStr(h hashWriter, s string) {
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writeBytes(h, []byte(s))
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}
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func writeBytes(h hashWriter, b []byte) {
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var lenBuf [8]byte
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binary.BigEndian.PutUint64(lenBuf[:], uint64(len(b)))
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_, _ = h.Write(lenBuf[:])
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_, _ = h.Write(b)
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}
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func writeBool(h hashWriter, v bool) {
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if v {
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_, _ = h.Write([]byte{1})
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} else {
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_, _ = h.Write([]byte{0})
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}
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}
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func writeInt64(h hashWriter, v int64) {
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var buf [8]byte
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binary.BigEndian.PutUint64(buf[:], uint64(v))
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_, _ = h.Write(buf[:])
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}
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func writeOptInt64(h hashWriter, v *int64) {
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if v == nil {
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_, _ = h.Write([]byte{0})
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return
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}
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_, _ = h.Write([]byte{1})
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writeInt64(h, *v)
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}
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