cognitox 0.1.1

AWS Cognito User Pools emulator for local development
Documentation 
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//! ListGroups API implementation
//!
//! <https://docs.aws.amazon.com/cognito-user-identity-pools/latest/APIReference/API_ListGroups.html>

use serde::Deserialize;
use serde_json::{Value, json};

use crate::{
    error::{AppError, Result},
    storage::Storage,
    types::UserPoolId,
};

#[derive(Debug, Deserialize)]
#[serde(rename_all = "PascalCase")]
struct Request {
    user_pool_id: UserPoolId,
    #[serde(default = "default_limit")]
    limit: i32,
    #[allow(dead_code)]
    next_token: Option<String>,
}

fn default_limit() -> i32 {
    60
}

pub async fn handler(storage: &Storage, body: Value) -> Result<Value> {
    let req: Request = serde_json::from_value(body)
        .map_err(|e| AppError::InvalidParameter(format!("Invalid request: {}", e)))?;

    storage
        .get_user_pool(&req.user_pool_id)
        .await
        .ok_or(AppError::UserPoolNotFound)?;

    let groups = storage.list_groups(&req.user_pool_id).await;

    let groups_json: Vec<Value> = groups
        .iter()
        .take(req.limit as usize)
        .map(|g| {
            json!({
                "GroupName": g.group_name,
                "UserPoolId": g.user_pool_id,
                "Description": g.description,
                "RoleArn": g.role_arn,
                "Precedence": g.precedence,
                "CreationDate": g.creation_date.timestamp(),
                "LastModifiedDate": g.last_modified_date.timestamp()
            })
        })
        .collect();

    Ok(json!({
        "Groups": groups_json
    }))
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::action::group::create_group;
    use crate::action::user_pool::create_user_pool;
    use serde_json::json;

    #[tokio::test]
    async fn test_list_groups_empty() {
        let storage = Storage::new();

        let pool = create_user_pool::handler(&storage, json!({"PoolName": "test-pool"}))
            .await
            .unwrap();
        let pool_id = pool["UserPool"]["Id"].as_str().unwrap();

        let result = handler(
            &storage,
            json!({
                "UserPoolId": pool_id
            }),
        )
        .await;

        assert!(result.is_ok());
        let body = result.unwrap();
        assert_eq!(body["Groups"].as_array().unwrap().len(), 0);
    }

    #[tokio::test]
    async fn test_list_groups_multiple() {
        let storage = Storage::new();

        let pool = create_user_pool::handler(&storage, json!({"PoolName": "test-pool"}))
            .await
            .unwrap();
        let pool_id = pool["UserPool"]["Id"].as_str().unwrap();

        create_group::handler(
            &storage,
            json!({
                "UserPoolId": pool_id,
                "GroupName": "admins"
            }),
        )
        .await
        .unwrap();

        create_group::handler(
            &storage,
            json!({
                "UserPoolId": pool_id,
                "GroupName": "users"
            }),
        )
        .await
        .unwrap();

        let result = handler(
            &storage,
            json!({
                "UserPoolId": pool_id
            }),
        )
        .await;

        assert!(result.is_ok());
        let body = result.unwrap();
        assert_eq!(body["Groups"].as_array().unwrap().len(), 2);
    }

    #[tokio::test]
    async fn test_list_groups_pool_not_found() {
        let storage = Storage::new();

        let result = handler(
            &storage,
            json!({
                "UserPoolId": "local_nonexistent"
            }),
        )
        .await;

        assert!(result.is_err());
    }
}