Refactor using Tauri (#278)

crates/gpapi/src/utils/base64.rs

@@ -0,0 +1,21 @@
+use base64::{engine::general_purpose, Engine};
+
+pub fn encode(data: &[u8]) -> String {
+  let engine = general_purpose::STANDARD;
+
+  engine.encode(data)
+}
+
+pub fn decode_to_vec(s: &str) -> anyhow::Result<Vec<u8>> {
+  let engine = general_purpose::STANDARD;
+  let decoded = engine.decode(s)?;
+
+  Ok(decoded)
+}
+
+pub(crate) fn decode_to_string(s: &str) -> anyhow::Result<String> {
+  let decoded = decode_to_vec(s)?;
+  let decoded = String::from_utf8(decoded)?;
+
+  Ok(decoded)
+}