feat: add tenant credential management (#63)

Adds the foundation for managing tenant credentials, including:

- `TenantCredentialScore` for scoring credential-related operations.
- `TenantCredentialManager` trait for creating users.
- `CredentialMetadata` struct to store credential information.
- `CredentialData` enum to hold credential content.
- `TenantCredentialBundle` struct to encapsulate metadata and content.

This provides a starting point for implementing credential creation, storage, and retrieval within the harmony system.

Reviewed-on: https://git.nationtech.io/NationTech/harmony/pulls/63
Co-authored-by: Jean-Gabriel Gill-Couture <jg@nationtech.io>
Co-committed-by: Jean-Gabriel Gill-Couture <jg@nationtech.io>

Cargo.lock

@@ -1422,6 +1422,7 @@ name = "harmony"
 version = "0.1.0"
 dependencies = [
  "async-trait",
+ "chrono",
  "cidr",
  "convert_case",
  "derive-new",

Cargo.toml

@@ -36,6 +36,7 @@ serde-value = "0.7.0"
 http = "1.2.0"
 inquire = "0.7.5"
 convert_case =  "0.8.0"
+chrono = "0.4"
 
 [workspace.dependencies.uuid]
 version = "1.11.0"

harmony/Cargo.toml

@@ -42,6 +42,7 @@ dockerfile_builder = "0.1.5"
 temp-file = "0.1.9"
 convert_case.workspace = true
 email_address = "0.2.9"
+chrono.workspace = true
 fqdn = { version = "0.4.6", features = [
     "domain-label-cannot-start-or-end-with-hyphen",
     "domain-label-length-limited-to-63",

harmony/src/modules/tenant/credentials.rs

@@ -0,0 +1,50 @@
+use async_trait::async_trait;
+use chrono::{DateTime, Utc};
+use serde::Serialize;
+
+use crate::{interpret::InterpretError, score::Score, topology::Topology};
+
+/// Create and manage Tenant Credentials.
+///
+/// This is meant to be used by cluster administrators who need to provide their tenant users and
+/// services with credentials to access their resources.
+#[derive(Debug, Clone, Serialize)]
+pub struct TenantCredentialScore;
+
+impl<T: Topology + TenantCredentialManager> Score<T> for TenantCredentialScore {
+    fn create_interpret(&self) -> Box<dyn crate::interpret::Interpret<T>> {
+        todo!()
+    }
+
+    fn name(&self) -> String {
+        todo!()
+    }
+}
+
+#[async_trait]
+pub trait TenantCredentialManager {
+    async fn create_user(&self) -> Result<TenantCredentialBundle, InterpretError>;
+}
+
+#[derive(Debug, Clone)]
+pub struct CredentialMetadata {
+    pub tenant_id: String,
+    pub credential_id: String,
+    pub description: String,
+    pub created_at: DateTime<Utc>,
+    pub expires_at: Option<DateTime<Utc>>,
+}
+
+#[derive(Debug, Clone)]
+pub enum CredentialData {
+    /// Used to store login instructions destined to a human. Akin to AWS login instructions email
+    /// upon new console user creation.
+    PlainText(String),
+}
+
+pub struct TenantCredentialBundle {
+    _metadata: CredentialMetadata,
+    _content: CredentialData,
+}
+
+impl TenantCredentialBundle {}

harmony/src/modules/tenant/mod.rs

@@ -1,3 +1,6 @@
+mod credentials;
+pub use credentials::*;
+
 use async_trait::async_trait;
 use serde::Serialize;