You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: app_password.rs
    path of file: ./repos/materialize/src/frontegg-auth/src
    
    the code of the file until where you have to start completion: // Copyright Materialize, Inc. and contributors. All rights reserved.
//
// Use of this software is governed by the Business Source License
// included in the LICENSE file.
//
// As of the Change Date specified in that file, in accordance with
// the Business Source License, use of this software will be governed
// by the Apache License, Version 2.0.

use std::error::Error;
use std::fmt;
use std::str::FromStr;

use serde::Deserialize;
use uuid::Uuid;

/// The prefix that identifies an app password as a Materialize password.
pub const PREFIX: &str = "mzp_";

/// A Materialize app password.
///
/// Somewhat unusually, the app password encodes both the client ID and secret
/// for the API key in use. Both the client ID and secret are UUIDs. The
/// passwor
    
    fn from_str(password: &str) -> Result<AppPassword, AppPasswordParseError> {
        let password = password.strip_prefix(PREFIX).ok_or(AppPasswordParseError)?;
        if password.len() == 43 || password.len() == 44 {
            // If it's exactly 43 or 44 bytes, assume we have base64-encoded
            // UUID bytes without or with padding, respectively.
            let buf = base64::decode_config(password, base64::URL_SAFE)
                .map_err(|_| AppPasswordParseError)?;
            let client_id = Uuid::from_slice(&buf[..16]).map_err(|_| AppPasswordParseError)?;
            let secret_key = Uuid::from_slice(&buf[16..]).map_err(|_| AppPasswordParseError)?;
            Ok(AppPassword {
                client_id,
                secret_key,
            })
        } else if password.len() >= 64 {
            // If it's more than 64 bytes, assume we have concatenated
            // hex-encoded UUIDs, possibly with some special characters mixed
            // in.
            let mut chars = password.chars().filter(|c| c.is_alphanumeric());
            let client_id = Uuid::parse_str(&chars.by_ref().take(32).collect::<String>())
                .map_err(|_| AppPasswordParseError)?;
            let secret_key = Uuid::parse_str(&chars.take(32).collect::<String>())
                .map_err(|_| AppPasswordParseError)?;
            Ok(AppPassword {
                client_id,
                secret_key,
            })
        } else {
            // Otherwise it's definitely not a password format we understand.
            Err(AppPasswordParseError)
        }
    }