show-user: add databases field, report when no users

Cargo.lock

@@ -1364,6 +1364,7 @@ version = "1.0.116"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3e17db7126d17feb94eb3fad46bf1a96b034e8aacbc2e775fe81505f8b0b2813"
 dependencies = [
+ "indexmap",
  "itoa",
  "ryu",
  "serde",

Cargo.toml

@@ -15,7 +15,7 @@ nix = { version = "0.28.0", features = ["user"] }
 prettytable = "0.10.0"
 ratatui = { version = "0.26.2", optional = true }
 serde = "1.0.198"
-serde_json = "1.0.116"
+serde_json = { version = "1.0.116", features = ["preserve_order"] }
 sqlx = { version = "0.7.4", features = ["runtime-tokio", "mysql", "tls-rustls"] }
 tokio = { version = "1.37.0", features = ["rt", "macros"] }
 toml = "0.8.12"

src/cli/user_command.rs

@@ -1,11 +1,18 @@
+use std::collections::BTreeMap;
 use std::vec;
 
 use anyhow::Context;
 use clap::Parser;
 use dialoguer::{Confirm, Password};
+use prettytable::Table;
+use serde_json::json;
 use sqlx::{Connection, MySqlConnection};
 
-use crate::core::{common::close_database_connection, user_operations::validate_user_name};
+use crate::core::{
+    common::close_database_connection,
+    database_operations::get_databases_where_user_has_privileges,
+    user_operations::validate_user_name,
+};
 
 #[derive(Parser)]
 pub struct UserArgs {
@@ -196,20 +203,47 @@ async fn show_users(args: UserShowArgs, conn: &mut MySqlConnection) -> anyhow::R
         result
     };
 
+    let mut user_databases: BTreeMap<String, Vec<String>> = BTreeMap::new();
+    for user in users.iter() {
+        user_databases.insert(
+            user.user.clone(),
+            get_databases_where_user_has_privileges(&user.user, conn).await?,
+        );
+    }
+
     if args.json {
-        println!("{}", serde_json::to_string_pretty(&users)?);
+        let users_json = users
+            .into_iter()
+            .map(|user| {
+                json!({
+                    "user": user.user,
+                    "has_password": user.has_password,
+                    "databases": user_databases.get(&user.user).unwrap_or(&vec![]),
+                })
+            })
+            .collect::<serde_json::Value>();
+        println!(
+            "{}",
+            serde_json::to_string_pretty(&users_json)
+                .context("Failed to serialize users to JSON")?
+        );
+    } else if users.is_empty() {
+        println!("No users found.");
     } else {
+        let mut table = Table::new();
+        table.add_row(row![
+            "User",
+            "Password is set",
+            "Databases where user has privileges"
+        ]);
         for user in users {
-            println!(
-                "User '{}': {}",
-                &user.user,
-                if user.has_password {
-                    "password set."
-                } else {
-                    "no password set."
-                }
-            );
+            table.add_row(row![
+                user.user,
+                user.has_password,
+                user_databases.get(&user.user).unwrap_or(&vec![]).join("\n")
+            ]);
         }
+        table.printstd();
     }
 
     Ok(())

src/core/database_operations.rs

@@ -1,7 +1,7 @@
 use std::collections::HashMap;
 
 use anyhow::Context;
-use indoc::indoc;
+use indoc::{formatdoc, indoc};
 use itertools::Itertools;
 use nix::unistd::User;
 use serde::{Deserialize, Serialize};
@@ -77,6 +77,37 @@ pub async fn get_database_list(conn: &mut MySqlConnection) -> anyhow::Result<Vec
     Ok(databases.into_iter().map(|d| d.database).collect())
 }
 
+pub async fn get_databases_where_user_has_privileges(
+    username: &str,
+    conn: &mut MySqlConnection,
+) -> anyhow::Result<Vec<String>> {
+    let result = sqlx::query(
+        formatdoc!(
+            r#"
+            SELECT `db` AS `database`
+            FROM `db`
+            WHERE `user` = ?
+              AND ({})
+        "#,
+            DATABASE_PRIVILEGE_FIELDS
+                .iter()
+                .map(|field| format!("`{}` = 'Y'", field))
+                .join(" OR "),
+        )
+        .as_str(),
+    )
+    .bind(username)
+    .fetch_all(conn)
+    .await?
+    .into_iter()
+    .map(|databases| {
+        databases.try_get::<String, _>("database").unwrap()
+    })
+    .collect();
+
+    Ok(result)
+}
+
 pub const DATABASE_PRIVILEGE_FIELDS: [&str; 13] = [
     "db",
     "user",