draft nip-34 helpers.

nip34/patch.go

@@ -0,0 +1,60 @@
+package nip34
+
+import (
+	"strings"
+
+	"github.com/bluekeyes/go-gitdiff/gitdiff"
+	"github.com/nbd-wtf/go-nostr"
+)
+
+type Patch struct {
+	nostr.Event
+
+	Repository nostr.EntityPointer
+	Subject    string
+
+	Files  []*gitdiff.File
+	Header *gitdiff.PatchHeader
+}
+
+func ParsePatch(event nostr.Event) Patch {
+	patch := Patch{
+		Event: event,
+	}
+
+	for _, tag := range event.Tags {
+		if len(tag) < 2 {
+			continue
+		}
+		switch tag[0] {
+		case "a":
+			spl := strings.Split(tag[1], ":")
+			if len(spl) != 3 {
+				continue
+			}
+			if !nostr.IsValid32ByteHex(spl[1]) {
+				continue
+			}
+			patch.Repository.Kind = nostr.KindRepositoryAnnouncement
+			patch.Repository.PublicKey = spl[1]
+			patch.Repository.Identifier = spl[2]
+			if len(tag) >= 3 {
+				patch.Repository.Relays = []string{tag[2]}
+			}
+		}
+	}
+
+	files, preamble, err := gitdiff.Parse(strings.NewReader(event.Content))
+	if err != nil {
+		return patch
+	}
+	patch.Files = files
+
+	header, err := gitdiff.ParsePatchHeader(preamble)
+	if err != nil {
+		return patch
+	}
+	patch.Header = header
+
+	return patch
+}