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package signedcommit
import (
"bytes"
objectid "codeberg.org/lindenii/furgit/object/id"
)
// Parse parses one raw commit object body for signature extraction.
//
// The returned Commit remains valid only while body remains unchanged.
//
// Labels: Deps-Borrowed, Life-Parent.
func Parse(body []byte) (*Commit, error) {
commit := &Commit{
body: body,
signatures: make(map[objectid.Algorithm][]byteRange),
}
payloadStart := 0
i := 0
for i < len(body) {
lineStart := i
rel := bytes.IndexByte(body[i:], '\n')
next := len(body)
lineEnd := len(body)
if rel >= 0 {
lineEnd = i + rel
next = lineEnd + 1
}
line := body[lineStart:lineEnd]
i = next
if len(line) == 0 {
commit.appendPayloadRange(payloadStart, len(body))
return commit, nil
}
if line[0] == ' ' {
continue
}
if !bytes.HasPrefix(line, []byte("gpgsig")) {
continue
}
commit.appendPayloadRange(payloadStart, lineStart)
key, valueStart, found := bytes.Cut(line, []byte{' '})
if found {
if algo, ok := objectid.ParseSignatureHeaderName(string(key)); ok {
commit.signatures[algo] = append(commit.signatures[algo], byteRange{
start: lineEnd - len(valueStart),
end: next,
})
}
}
for i < len(body) {
rel := bytes.IndexByte(body[i:], '\n')
next = len(body)
lineEnd = len(body)
if rel >= 0 {
lineEnd = i + rel
next = lineEnd + 1
}
contStart := i
cont := body[contStart:lineEnd]
if len(cont) == 0 || cont[0] != ' ' {
break
}
if found {
if algo, ok := objectid.ParseSignatureHeaderName(string(key)); ok {
commit.signatures[algo] = append(commit.signatures[algo], byteRange{
start: contStart + 1,
end: next,
})
}
}
i = next
}
payloadStart = i
}
commit.appendPayloadRange(payloadStart, len(body))
return commit, nil
}
func (commit *Commit) appendPayloadRange(start, end int) {
if start >= end {
return
}
commit.payload = append(commit.payload, byteRange{start: start, end: end})
}
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