enostr: add initial note code

enostr/src/note.rs

@@ -0,0 +1,91 @@
+use crate::Event;
+use shatter::shard::Shards;
+
+#[derive(Debug, Eq, PartialEq)]
+struct RefId(i32);
+
+struct Ref<'a> {
+    ref_tag: u8,
+    relay_id: Option<&'a str>,
+    id: &'a str,
+}
+
+impl<'a> RefId {
+    fn get_ref(self, tags: &'a Vec<Vec<String>>) -> Option<Ref<'a>> {
+        let ind = self.0 as usize;
+
+        if ind > tags.len() - 1 {
+            return None;
+        }
+
+        let tag = &tags[ind];
+
+        if tag.len() < 2 {
+            return None;
+        }
+
+        if tag[0].len() != 1 {
+            return None;
+        }
+
+        let ref_tag = if let Some(rtag) = tag[0].as_bytes().first() {
+            *rtag
+        } else {
+            0
+        };
+
+        let id = &tag[1];
+        if id.len() != 64 {
+            return None;
+        }
+
+        let relay_id = if tag[2].len() == 0 {
+            None
+        } else {
+            Some(&*tag[2])
+        };
+
+        Some(Ref {
+            ref_tag,
+            relay_id,
+            id,
+        })
+    }
+}
+
+enum MentionType {
+    Pubkey,
+    Event,
+}
+
+struct Mention {
+    index: Option<i32>,
+    typ: MentionType,
+    refid: RefId,
+}
+
+enum EventRef {
+    Mention(Mention),
+    ThreadId(RefId),
+    Reply(RefId),
+    ReplyToRoot(RefId),
+}
+
+struct EventRefs {
+    refs: Vec<EventRef>,
+}
+
+struct TextNote {
+    event: Event,
+    shards: Shards,
+    refs: EventRefs,
+}
+
+struct DM {
+    decrypted: Option<String>,
+    shards: Shards,
+}
+
+enum Note {
+    Text(TextNote),
+}