podsync 0.1.12

A server to sync podcasts with, mirroring the gpodder API. Designed for use with AntennaPod
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use std::{
    fmt::{self, Display, Formatter},
    str::FromStr,
};

use base64_light::base64_decode;
use log::error;
use uuid::Uuid;

pub struct BasicAuth {
    user: String,
    pass: String,
}

pub struct AuthError<'u> {
    path_user: &'u str,
    auth_user: String,
}

pub struct AuthAttempt {
    auth: BasicAuth,
}

#[derive(PartialEq, Eq)]
pub struct SessionId(Uuid);

pub fn pwhash(s: &str) -> String {
    sha256::digest(s)
}

impl BasicAuth {
    pub fn with_path_username(self, username: &str) -> Result<AuthAttempt, AuthError<'_>> {
        if self.user == username {
            Ok(AuthAttempt { auth: self })
        } else {
            Err(AuthError {
                path_user: username,
                auth_user: self.user,
            })
        }
    }
}

impl Display for AuthError<'_> {
    fn fmt(&self, fmt: &mut Formatter<'_>) -> Result<(), fmt::Error> {
        write!(
            fmt,
            "path-username ({:?}) <-> auth-username ({:?}) mismatch",
            self.path_user, self.auth_user
        )
    }
}

impl FromStr for BasicAuth {
    type Err = &'static str;

    fn from_str(header: &str) -> Result<Self, Self::Err> {
        let inner = || {
            let (basic, auth_b64) = header.split_once(' ').ok_or("no space in auth header")?;

            if basic != "Basic" {
                return Err("only basic auth supported");
            }

            let auth_bytes = base64_decode(auth_b64);
            let auth = std::str::from_utf8(&auth_bytes).map_err(|e| {
                error!("invalid utf-8 for password: {e:?}");
                "none-utf8 in auth header"
            })?;

            let (user, pass) = auth.split_once(':').ok_or("no colon in auth value")?;

            let user = user.into();
            let pass = pass.into();

            Ok(Self { user, pass })
        };

        inner().map_err(|e| {
            error!("{}", e);
            e
        })
    }
}

impl AuthAttempt {
    pub fn user(&self) -> &str {
        &self.auth.user
    }

    pub fn calc_pwhash(&self) -> String {
        pwhash(&self.auth.pass[..])
    }
}

impl SessionId {
    pub fn new() -> Self {
        Self::from(Uuid::new_v4())
    }
}

impl std::fmt::Display for SessionId {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        self.0.as_simple().fmt(f)
    }
}

impl FromStr for SessionId {
    type Err = ();

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        Uuid::try_from(s).map(Self).map_err(|_| ())
    }
}

impl From<Uuid> for SessionId {
    fn from(uuid: Uuid) -> Self {
        Self(uuid)
    }
}