feat: non-interactive Argon2id PHC hash generation

src/main.rs

@@ -33,6 +33,7 @@ use std::{
     process::exit,
     str::FromStr,
     thread,
+    io::{self, IsTerminal},
 };
 
 use tokio::{
@@ -148,9 +149,14 @@ fn parse_args() {
                 }
             }
 
+            let stdin = io::stdin();
+            let interactive = stdin.is_terminal();
+
+            let password;
+            if interactive {
                 println!("Generate an Argon2id PHC string using the '{selected_preset}' preset:\n");
 
-            let password = rpassword::prompt_password("Password: ").unwrap();
+                password = rpassword::prompt_password("Password: ").unwrap();
                 if password.len() < 8 {
                     println!("\nPassword must contain at least 8 characters");
                     exit(1);
@@ -161,12 +167,20 @@ fn parse_args() {
                     println!("\nPasswords do not match");
                     exit(1);
                 }
+            } else {
+                password = rpassword::read_password_from_bufread(&mut stdin.lock()).unwrap();
+                if password.len() < 8 {
+                    eprintln!("Password must contain at least 8 characters");
+                    exit(1);
+                }
+            }
 
             let argon2 = Argon2::new(Argon2id, V0x13, argon2_params.build().unwrap());
             let salt = SaltString::encode_b64(&crate::crypto::get_random_bytes::<32>()).unwrap();
 
             let argon2_timer = tokio::time::Instant::now();
             if let Ok(password_hash) = argon2.hash_password(password.as_bytes(), &salt) {
+                if interactive {
                     println!(
                         "\n\
                         ADMIN_TOKEN='{password_hash}'\n\n\
@@ -174,7 +188,10 @@ fn parse_args() {
                         argon2_timer.elapsed()
                     );
                 } else {
-                error!("Unable to generate Argon2id PHC hash.");
+                    println!("{}", password_hash)
+                }
+            } else {
+                eprintln!("Unable to generate Argon2id PHC hash.");
                 exit(1);
             }
         }