Missed some files

crates/model/src/base64_array.rs

@@ -0,0 +1,19 @@
+use serde::{Deserialize, Serialize};
+use serde::{Deserializer, Serializer};
+use std::convert::TryInto;
+
+pub fn serialize<S: Serializer, const C: usize>(v: &[u8; C], s: S) -> Result<S::Ok, S::Error> {
+    #[allow(deprecated)]
+    let base64 = base64::encode(v);
+    String::serialize(&base64, s)
+}
+
+pub fn deserialize<'de, D: Deserializer<'de>, const C: usize>(d: D) -> Result<[u8; C], D::Error> {
+    let base64 = String::deserialize(d)?;
+    #[allow(deprecated)]
+    let bytes = base64::decode(base64).map_err(serde::de::Error::custom)?;
+    let bytes: [u8; C] = bytes.try_into().map_err(|data: Vec<u8>| {
+        serde::de::Error::custom(format!("failed to convert array (len={})", data.len()))
+    })?;
+    Ok(bytes)
+}