56 lines
1.4 KiB
Go
56 lines
1.4 KiB
Go
package ratel
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import (
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"ratel.mleku.dev/keys"
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"ratel.mleku.dev/keys/arb"
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"ratel.mleku.dev/keys/index"
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"ratel.mleku.dev/keys/kinder"
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"ratel.mleku.dev/keys/pubkey"
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eventstore "store.mleku.dev"
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"util.mleku.dev/hex"
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)
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// GetTagKeyPrefix returns tag index prefixes based on the initial field of a
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// tag.
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//
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// There is 3 types of index tag keys:
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//
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// - TagAddr: [ 8 ][ 2b Kind ][ 8b Pubkey ][ address/URL ][ 8b Serial ]
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//
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// - Tag32: [ 7 ][ 8b Pubkey ][ 8b Serial ]
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//
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// - Tag: [ 6 ][ address/URL ][ 8b Serial ]
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//
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// This function produces the initial bytes without the index.
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func GetTagKeyPrefix(tagValue string) (key []byte, err error) {
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if k, pkb, d := eventstore.GetAddrTagElements(tagValue); len(pkb) == 32 {
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// store value in the new special "a" tag index
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var pk *pubkey.T
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if pk, err = pubkey.NewFromBytes(pkb); Chk.E(err) {
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return
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}
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els := []keys.Element{kinder.New(k), pk}
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if len(d) > 0 {
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els = append(els, arb.NewFromString(d))
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}
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key = index.TagAddr.Key(els...)
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} else if pkb, _ := hex.Dec(tagValue); len(pkb) == 32 {
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// store value as bytes
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var pkk *pubkey.T
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if pkk, err = pubkey.NewFromBytes(pkb); Chk.E(err) {
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return
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}
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key = index.Tag32.Key(pkk)
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} else {
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// store whatever as utf-8
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if len(tagValue) > 0 {
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var a *arb.T
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a = arb.NewFromString(tagValue)
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key = index.Tag.Key(a)
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} else {
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key = index.Tag.Key()
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}
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}
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return
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}
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