add nip31, nip52, nip94.

nip94/nip94.go

@@ -0,0 +1,107 @@
+package nip94
+
+import (
+	"strings"
+
+	"github.com/nbd-wtf/go-nostr"
+)
+
+func ParseFileMetadata(event nostr.Event) FileMetadata {
+	fm := FileMetadata{}
+	for _, tag := range event.Tags {
+		if len(tag) < 2 {
+			continue
+		}
+		switch tag[0] {
+		case "url":
+			fm.URL = tag[1]
+		case "x":
+			fm.X = tag[1]
+		case "ox":
+			fm.OX = tag[1]
+		case "size":
+			fm.Size = tag[1]
+		case "dim":
+			fm.Dim = tag[1]
+		case "magnet":
+			fm.Magnet = tag[1]
+		case "i":
+			fm.TorrentInfoHash = tag[1]
+		case "blurhash":
+			fm.Blurhash = tag[1]
+		case "thumb":
+			fm.Image = tag[1]
+		case "summary":
+			fm.Summary = tag[1]
+		}
+	}
+	return fm
+}
+
+type FileMetadata struct {
+	Magnet          string
+	Dim             string
+	Size            string
+	Summary         string
+	Image           string
+	URL             string
+	M               string
+	X               string
+	OX              string
+	TorrentInfoHash string
+	Blurhash        string
+	Thumb           string
+}
+
+func (fm FileMetadata) IsVideo() bool { return strings.Split(fm.M, "/")[0] == "video" }
+func (fm FileMetadata) IsImage() bool { return strings.Split(fm.M, "/")[0] == "image" }
+func (fm FileMetadata) DisplayImage() string {
+	if fm.Image != "" {
+		return fm.Image
+	} else if fm.IsImage() {
+		return fm.URL
+	} else {
+		return ""
+	}
+}
+
+func (fm FileMetadata) ToTags() nostr.Tags {
+	tags := make(nostr.Tags, 0, 12)
+	if fm.URL != "" {
+		tags = append(tags, nostr.Tag{"url", fm.URL})
+	}
+	if fm.M != "" {
+		tags = append(tags, nostr.Tag{"m", fm.M})
+	}
+	if fm.X != "" {
+		tags = append(tags, nostr.Tag{"x", fm.X})
+	}
+	if fm.OX != "" {
+		tags = append(tags, nostr.Tag{"ox", fm.OX})
+	}
+	if fm.Size != "" {
+		tags = append(tags, nostr.Tag{"size", fm.Size})
+	}
+	if fm.Dim != "" {
+		tags = append(tags, nostr.Tag{"dim", fm.Dim})
+	}
+	if fm.Magnet != "" {
+		tags = append(tags, nostr.Tag{"magnet", fm.Magnet})
+	}
+	if fm.TorrentInfoHash != "" {
+		tags = append(tags, nostr.Tag{"i", fm.TorrentInfoHash})
+	}
+	if fm.Blurhash != "" {
+		tags = append(tags, nostr.Tag{"blurhash", fm.Blurhash})
+	}
+	if fm.Thumb != "" {
+		tags = append(tags, nostr.Tag{"thumb", fm.Thumb})
+	}
+	if fm.Image != "" {
+		tags = append(tags, nostr.Tag{"image", fm.Image})
+	}
+	if fm.Summary != "" {
+		tags = append(tags, nostr.Tag{"summary", fm.Summary})
+	}
+	return tags
+}