nip-01 update: everything as arrays on filters.

filter/utils.go

@@ -0,0 +1,87 @@
+package filter
+
+import "github.com/fiatjaf/go-nostr/event"
+
+func stringsEqual(as, bs []string) bool {
+	if len(as) != len(bs) {
+		return false
+	}
+
+	for _, a := range as {
+		for _, b := range bs {
+			if b == a {
+				goto next
+			}
+		}
+		// didn't find a B that corresponded to the current A
+		return false
+
+	next:
+		continue
+	}
+
+	return true
+}
+
+func intsEqual(as, bs []int) bool {
+	if len(as) != len(bs) {
+		return false
+	}
+
+	for _, a := range as {
+		for _, b := range bs {
+			if b == a {
+				goto next
+			}
+		}
+		// didn't find a B that corresponded to the current A
+		return false
+
+	next:
+		continue
+	}
+
+	return true
+}
+
+func stringsContain(haystack []string, needle string) bool {
+	for _, hay := range haystack {
+		if hay == needle {
+			return true
+		}
+	}
+	return false
+}
+
+func intsContain(haystack []int, needle int) bool {
+	for _, hay := range haystack {
+		if hay == needle {
+			return true
+		}
+	}
+	return false
+}
+
+func containsAnyTag(tagName string, tags event.Tags, values []string) bool {
+	for _, tag := range tags {
+		if len(tag) < 2 {
+			continue
+		}
+
+		currentTagName, ok := tag[0].(string)
+		if !ok || currentTagName != tagName {
+			continue
+		}
+
+		currentTagValue, ok := tag[1].(string)
+		if !ok {
+			continue
+		}
+
+		if stringsContain(values, currentTagValue) {
+			return true
+		}
+	}
+
+	return false
+}