radicle: add UserInfo to git

Add a type to capture user information that can be used for Git
configuration and signatures.

Signed-off-by: Fintan Halpenny <fintan.halpenny@gmail.com>
X-Clacks-Overhead: GNU Terry Pratchett

radicle/src/git.rs

@@ -8,6 +8,7 @@ use once_cell::sync::Lazy;
 
 use crate::collections::RandomMap;
 use crate::crypto::PublicKey;
+use crate::node::Alias;
 use crate::storage;
 use crate::storage::refs::Refs;
 use crate::storage::RemoteId;
@@ -666,6 +667,29 @@ pub mod env {
     ];
 }
 
+/// The user information used for signing commits and configuring the
+/// `name` and `email` fields in the Git config.
+#[derive(Debug, Clone)]
+pub struct UserInfo {
+    /// Alias of the local peer.
+    pub alias: Alias,
+    /// [`PublicKey`] of the local peer.
+    pub key: PublicKey,
+}
+
+impl UserInfo {
+    /// The name of the user, i.e. the `alias`.
+    pub fn name(&self) -> Alias {
+        self.alias.clone()
+    }
+
+    /// The "email" of the user, which is in the form
+    /// `<alias>@<public key>`.
+    pub fn email(&self) -> String {
+        format!("{}@{}", self.alias, self.key)
+    }
+}
+
 #[cfg(test)]
 mod test {
     use super::*;

radicle/src/storage.rs

@@ -24,6 +24,7 @@ use crate::identity::{Id, Identity};
 use crate::storage::git::NAMESPACES_GLOB;
 use crate::storage::refs::Refs;
 
+use self::git::UserInfo;
 use self::refs::SignedRefs;
 
 pub type BranchName = git::RefString;
@@ -507,6 +508,8 @@ pub trait WriteRepository: ReadRepository + SignRepository {
     }
     /// Set the repository 'rad/id' to the given commit.
     fn set_identity_head_to(&self, commit: Oid) -> Result<(), RepositoryError>;
+    /// Set the user info of the Git repository.
+    fn set_user(&self, info: &UserInfo) -> Result<(), Error>;
     /// Get the underlying git repository.
     fn raw(&self) -> &git2::Repository;
 }

radicle/src/storage/git.rs

@@ -637,6 +637,13 @@ impl WriteRepository for Repository {
         Ok(())
     }
 
+    fn set_user(&self, info: &UserInfo) -> Result<(), Error> {
+        let mut config = self.backend.config()?;
+        config.set_str("user.name", &info.name())?;
+        config.set_str("user.email", &info.email())?;
+        Ok(())
+    }
+
     fn raw(&self) -> &git2::Repository {
         &self.backend
     }

radicle/src/test/storage.rs

@@ -263,6 +263,10 @@ impl WriteRepository for MockRepository {
     fn set_identity_head_to(&self, _commit: Oid) -> Result<(), RepositoryError> {
         todo!()
     }
+
+    fn set_user(&self, _info: &git::UserInfo) -> Result<(), Error> {
+        todo!()
+    }
 }
 
 impl SignRepository for MockRepository {