Set up plugin structure

src/plugin.rs

@@ -0,0 +1,43 @@
+use age_core::format::{FileKey, Stanza};
+use age_plugin::{
+    identity::{self, Callbacks, IdentityPluginV1},
+    recipient::{self, RecipientPluginV1},
+};
+use std::collections::HashMap;
+use std::io;
+
+#[derive(Debug, Default)]
+pub(crate) struct RecipientPlugin {}
+
+impl RecipientPluginV1 for RecipientPlugin {
+    fn add_recipients<'a, I: Iterator<Item = &'a str>>(
+        &mut self,
+        recipients: I,
+    ) -> Result<(), Vec<recipient::Error>> {
+        todo!()
+    }
+
+    fn wrap_file_key(&mut self, file_key: &FileKey) -> Result<Vec<Stanza>, Vec<recipient::Error>> {
+        todo!()
+    }
+}
+
+#[derive(Debug, Default)]
+pub(crate) struct IdentityPlugin {}
+
+impl IdentityPluginV1 for IdentityPlugin {
+    fn add_identities<'a, I: Iterator<Item = &'a str>>(
+        &mut self,
+        identities: I,
+    ) -> Result<(), Vec<identity::Error>> {
+        todo!()
+    }
+
+    fn unwrap_file_keys(
+        &mut self,
+        files: Vec<Vec<Stanza>>,
+        mut callbacks: impl Callbacks,
+    ) -> io::Result<HashMap<usize, Result<FileKey, Vec<identity::Error>>>> {
+        todo!()
+    }
+}