feat: Secret module works with infisical and local file storage backends

harmony_secret_derive/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "harmony-secret-derive"
+version = "0.1.0"
+edition = "2024"
+
+[lib]
+proc-macro = true
+
+[dependencies]
+quote = "1.0"
+proc-macro2 = "1.0"
+proc-macro-crate = "3.3"
+syn = "2.0"

harmony_secret_derive/src/lib.rs

@@ -0,0 +1,38 @@
+use proc_macro::TokenStream;
+use proc_macro_crate::{FoundCrate, crate_name};
+use quote::quote;
+use syn::{DeriveInput, Ident, parse_macro_input};
+
+#[proc_macro_derive(Secret)]
+pub fn derive_secret(input: TokenStream) -> TokenStream {
+    let input = parse_macro_input!(input as DeriveInput);
+    let struct_ident = &input.ident;
+
+    // The key for the secret will be the stringified name of the struct itself.
+    // e.g., `struct OKDClusterSecret` becomes key `"OKDClusterSecret"`.
+    let key = struct_ident.to_string();
+
+    // Find the path to the `harmony_secret` crate.
+    let secret_crate_path = match crate_name("harmony-secret") {
+        Ok(FoundCrate::Itself) => quote!(crate),
+        Ok(FoundCrate::Name(name)) => {
+            let ident = Ident::new(&name, proc_macro2::Span::call_site());
+            quote!(::#ident)
+        }
+        Err(e) => {
+            return syn::Error::new(proc_macro2::Span::call_site(), e.to_string())
+                .to_compile_error()
+                .into();
+        }
+    };
+
+    // The generated code now implements `Secret` for the struct itself.
+    // The struct must also derive `Serialize` and `Deserialize` for this to be useful.
+    let expanded = quote! {
+        impl #secret_crate_path::Secret for #struct_ident {
+            const KEY: &'static str = #key;
+        }
+    };
+
+    TokenStream::from(expanded)
+}