initial nostr code

enostr/src/error.rs

@@ -0,0 +1,38 @@
+use serde_json;
+
+#[derive(Debug)]
+pub enum Error {
+    MessageEmpty,
+    MessageDecodeFailed,
+    InvalidSignature,
+    Json(serde_json::Error),
+    Generic(String),
+}
+
+impl std::cmp::PartialEq for Error {
+    fn eq(&self, other: &Self) -> bool {
+        match (self, other) {
+            (Error::MessageEmpty, Error::MessageEmpty) => true,
+            (Error::MessageDecodeFailed, Error::MessageDecodeFailed) => true,
+            (Error::InvalidSignature, Error::InvalidSignature) => true,
+            // This is slightly wrong but whatevs
+            (Error::Json(..), Error::Json(..)) => true,
+            (Error::Generic(left), Error::Generic(right)) => left == right,
+            _ => false,
+        }
+    }
+}
+
+impl std::cmp::Eq for Error {}
+
+impl From<String> for Error {
+    fn from(s: String) -> Self {
+        Error::Generic(s)
+    }
+}
+
+impl From<serde_json::Error> for Error {
+    fn from(e: serde_json::Error) -> Self {
+        Error::Json(e)
+    }
+}