~mort/coffeepaste

ref: ffefeb6de68dbc8d9dba91c614e93a100b9453fd coffeepaste/src/main.rs -rw-r--r-- 16.3 KiB
ffefeb6dMartin Dørum add allow_upload key 5 months ago
                                                                                
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mod purge;
mod exif;
mod mime;

use serde_derive::Deserialize;
use log::{debug, info, error};
use once_cell::sync::OnceCell;
use std::borrow::Cow::Borrowed;
use std::convert::Infallible;
use std::fs;
use std::fs::{OpenOptions, File};
use std::io;
use std::io::{Write, SeekFrom};
use std::path::Path;
use std::net::SocketAddr;
use std::iter;
use std::error::Error;
use std::time::Duration;
use std::os::unix::io::AsRawFd;
use std::thread;
use toml;
use tokio;
use tokio::io::AsyncSeekExt;
use tokio_util::codec::{BytesCodec, FramedRead};
use futures::stream::StreamExt;
use rand::{Rng, thread_rng};
use rand::distributions::Alphanumeric;
use hyper::{Body, Method, Request, Response, Server};
use hyper::service::{make_service_fn, service_fn};
use hyper::header;

static INDEX_HTML: &'static [u8] = include_bytes!("../web/index.html");
static VIEW_HTML: &'static [u8] = include_bytes!("../web/view.html");
static ALBUM_HTML: &'static [u8] = include_bytes!("../web/album.html");
static FAVICON_ICO: &'static [u8] = include_bytes!("../web/favicon.ico");
static VENDOR_HIGHLIGHT_JS: &'static [u8] = include_bytes!("../web/vendor/highlight.min.js");
static VENDOR_HIGHLIGHT_CSS: &'static [u8] = include_bytes!("../web/vendor/highlight.min.css");
static ERR_400_HTML: &'static [u8] = include_bytes!("../web/400.html");
static ERR_401_HTML: &'static [u8] = include_bytes!("../web/401.html");
static ERR_404_HTML: &'static [u8] = include_bytes!("../web/404.html");
static ERR_413_HTML: &'static [u8] = include_bytes!("../web/413.html");
static ERR_500_HTML: &'static [u8] = include_bytes!("../web/500.html");

static CONFIG: OnceCell<Config> = OnceCell::new();

#[derive(Deserialize, Debug)]
struct UserConfig {
    token: String,
    allow_upload: Option<bool>,
    max_file_size: Option<i64>,
}

#[derive(Deserialize, Debug)]
struct Config {
    data: String,
    expiration_days: i64,
    listen: String,
    max_file_size: i64,
    url: String,
    allow_upload: bool,
    users: Vec<UserConfig>,
}

impl std::default::Default for Config {
    fn default() -> Self {
        Self {
            data: "./data".into(),
            expiration_days: 30,
            listen: "127.0.0.1:8080".into(),
            max_file_size: 10000000,
            url: "http://localhost:8080".into(),
            allow_upload: true,
            users: Vec::new(),
        }
    }
}

fn parse_range(range: &str) -> Result<(u64, Option<u64>), Box<dyn Error>> {
    let range = range.split("bytes=").nth(1).ok_or("Missing 'bytes='")?;

    let mut parts = range.split("-");
    let from = parts.next().unwrap().parse::<u64>()?;
    let to = match parts.next() {
        Some("") => None,
        Some(to) => Some(to.parse::<u64>()?),
        None => None,
    };

    return Ok((from, to));
}

async fn serve_file(path: &Path, mime: &str, req: &Request<Body>)-> Result<Response<Body>, Box<dyn Error>> {
    let mut file = match tokio::fs::File::open(path).await {
        Err(err) => {
            error!("Couldn't open {}: {}", path.display(), err);
            return Ok(respond_404()?);
        },
        Ok(file) => file,
    };

    let meta = file.metadata().await?;

    // Update access time (to keep track of the latest access)
    // Don't change atime, because I don't want to use a value which
    // is likely to be updated by programs other than coffeepaste
    purge::update_access(
        file.as_raw_fd(),
        meta.modified()?)?;

    let content_type;
    if mime.starts_with("text/") {
        content_type = format!("{}; charset=utf-8", mime);
    } else {
        content_type = mime.to_string();
    }

    let rb = Response::builder()
        .header(header::CONTENT_TYPE, content_type)
        .header(header::ACCEPT_RANGES, "bytes")
        .header(header::X_CONTENT_TYPE_OPTIONS, "nosniff");

    if let Some(h) = req.headers().get(header::RANGE) {
        let (start, end) = match parse_range(h.to_str()?) {
            Err(err) => {
                error!("Failed to parse range: {}", err);
                return Ok(respond_400()?);
            },
            Ok(range) => range,
        };

        file.seek(SeekFrom::Start(start)).await?;

        if let Some(end) = end {
            let len = (end - start + 1) as usize;
            return Ok(rb
                .status(206)
                .header(header::CONTENT_LENGTH, &len.to_string())
                .body(Body::wrap_stream(FramedRead::new(file, BytesCodec::new()).take(len)))
                .unwrap());
        } else {
            return Ok(rb
                .status(206)
                .header(header::CONTENT_LENGTH, &(meta.len() - start).to_string())
                .body(Body::wrap_stream(FramedRead::new(file, BytesCodec::new())))
                .unwrap());
        }
    } else {
        return Ok(rb
            .status(200)
            .header(header::CONTENT_LENGTH, &meta.len().to_string())
            .body(Body::wrap_stream(FramedRead::new(file, BytesCodec::new())))
            .unwrap());
    }
}

fn is_illegal_name(name: &str) -> bool {
    return
        name == "index" ||
        name == "favicon" ||
        name == "vendor" ||
        name == "a";
}

fn create_random_file(dir: &str) -> io::Result<(File, String)> {
    let mut len = 3;
    let mut rng = thread_rng();
    loop {
        let name: String = iter::repeat(())
            .map(|()| rng.sample(Alphanumeric))
            .map(char::from)
            .take(len)
            .collect();
        if is_illegal_name(&name) {
            continue;
        }

        let pathbuf = Path::new(dir).join(&name);
        let path = pathbuf.to_string_lossy().to_string();
        len += 1;

        let file = OpenOptions::new()
            .create_new(true).write(true).open(&path);

        match file {
            Err(err) => match err.kind() {
                io::ErrorKind::AlreadyExists => continue,
                _ => return Err(err),
            },
            Ok(file) => return Ok((file, name)),
        };
    }
}

fn delete_file(dir: &str, name: &str) {
    let pathbuf = Path::new(dir).join(name);
    if let Err(err) = fs::remove_file(pathbuf) {
        error!("Failed to remove {}/{}: {}", dir, name, err);
    }
}

fn request_prefers_raw(req: &Request<Body>) -> bool {
    let headers = req.headers();
    let accept = headers.get(header::ACCEPT);
    if let None = accept {
        return true;
    }

    let accept = accept.unwrap().to_str();
    if let Err(_err) = accept {
        return true;
    }

    let accept = accept.unwrap();
    for s in accept.split(",") {
        match &s.trim().to_ascii_lowercase() as &str {
            "text/html" => return false, // Prefers HTML
            "*/*" => return true, // Prefers whatever before HTML
            "text/plain" => return false, // Prefers text/plain before HTML
            _ => (),
        }
    }

    return false;
}

fn respond_400() -> Result<Response<Body>, Infallible> {
    Ok(Response::builder().status(400)
       .header(header::CONTENT_TYPE, "text/html")
       .body(Body::from(ERR_400_HTML)).unwrap())
}

fn respond_404() -> Result<Response<Body>, Infallible> {
    Ok(Response::builder().status(404)
       .header(header::CONTENT_TYPE, "text/html")
       .body(Body::from(ERR_404_HTML)).unwrap())
}

fn respond_413() -> Result<Response<Body>, Infallible> {
    Ok(Response::builder().status(413)
       .header(header::CONTENT_TYPE, "text/html")
       .body(Body::from(ERR_413_HTML)).unwrap())
}

fn respond_500() -> Result<Response<Body>, Infallible> {
    Ok(Response::builder().status(500)
       .header(header::CONTENT_TYPE, "text/html")
       .body(Body::from(ERR_500_HTML)).unwrap())
}

async fn on_get(config: &Config, req: Request<Body>) -> Result<Response<Body>, Box<dyn Error>> {
    let path = req.uri().path();
    if path == "/" || path == "/index.html" {
        return Ok(Response::builder()
            .header(header::CONTENT_TYPE, "text/html")
            .body(Body::from(INDEX_HTML))?);
    } else if path.starts_with("/a/") {
        return Ok(Response::builder()
            .header(header::CONTENT_TYPE, "text/html")
            .body(Body::from(ALBUM_HTML))?);
    } else if path == "/a" {
        return Ok(Response::builder()
            .status(302)
            .header(header::LOCATION, "/a/")
            .body(Body::from("Redirect"))?);
    } else if path == "/favicon.ico" {
        return Ok(Response::builder()
            .header(header::CONTENT_TYPE, "image/x-icon")
            .body(Body::from(FAVICON_ICO))?);
    } else if path == "/vendor/highlight.js" {
        return Ok(Response::builder()
            .header(header::CONTENT_TYPE, "application/javascript")
            .body(Body::from(VENDOR_HIGHLIGHT_JS))?);
    } else if path == "/vendor/highlight.css" {
        return Ok(Response::builder()
            .header(header::CONTENT_TYPE, "text/css")
            .body(Body::from(VENDOR_HIGHLIGHT_CSS))?);
    }

    let name = &path[1..];

    // Two slashes after each other is probably just an error
    let firstchar = name.chars().next();
    if firstchar.is_none() || firstchar.unwrap() == '/' {
        return Ok(respond_404()?);
    }

    let extension = match &Path::new(path).extension() {
        Some(ext) => Some(ext.to_string_lossy()),
        None => None,
    };

    // If we have an extension, we need to serve with the appropriate Content-Type
    let mime = match &extension {
        Some(ext) => mime::from_ext(&ext),
        None => None,
    };

    // /ID.<extension> serves a page with javascript which does syntax highlighting,
    // if the extension/mime is a type associated with a plain-text file type
    // (and if the request is from a device which prefers HTML to plain text)
    if mime::is_plain_text(extension.as_deref(), mime) {
        if !request_prefers_raw(&req) {
            return Ok(Response::builder()
                .header(header::CONTENT_TYPE, "text/html")
                .body(Body::from(VIEW_HTML))?);
        }
    }

    // Serve the actual file
    let mut pathbuf = Path::new(&config.data as &str).join(&name);
    pathbuf.set_extension("");
    return serve_file(&pathbuf, mime.unwrap_or_else(|| "text/plain"), &req).await;
}

async fn on_put(config: &Config, req: Request<Body>) -> Result<Response<Body>, Infallible> {
    let headers = req.headers();

    let mut max_file_size = config.max_file_size;
    let mut allow_upload = config.allow_upload;

    if let Some(auth) = headers.get(header::AUTHORIZATION) {
        let mut parts = match auth.to_str() {
            Err(err) => {
                error!("Authorization header exists but can't be stringified: {}", err);
                return Ok(Response::builder()
                    .status(400).body(Body::from(ERR_400_HTML)).unwrap());
            },
            Ok(s) => s.split(" "),
        };

        let scheme = parts.nth(0);
        let mut tok = "".to_owned();
        for part in parts {
            if tok != "" {
                tok += " ";
                tok += part;
            } else {
                tok += part;
            }
        }

        if scheme.is_none() || scheme.unwrap().to_ascii_lowercase() != "bearer" || tok == "" {
            error!("Invalid authorization header");
            return Ok(Response::builder()
                .status(400).body(Body::from(ERR_400_HTML)).unwrap());
        }

        // TODO(perf): Consider a O(1) or O(log n) lookup
        let mut user_config: Option<&UserConfig> = None;
        for user in &config.users {
            if user.token == tok {
                user_config = Some(&user);
                break;
            }
        }

        if user_config.is_none() {
            error!("Invalid authorization token");
            return Ok(Response::builder()
                .status(401).body(Body::from(ERR_401_HTML)).unwrap());
        }

        let user_config = user_config.unwrap();

        if let Some(user_max_file_size) = user_config.max_file_size {
            max_file_size = user_max_file_size;
        }

        if let Some(user_allow_upload) = user_config.allow_upload {
            allow_upload = user_allow_upload;
        }
    }

    if !allow_upload {
        error!("Uploads not allowed");
        return Ok(Response::builder()
            .status(401).body(Body::from(ERR_401_HTML)).unwrap());
    }

    let (parts, mut reqbody) = req.into_parts();
    let pathstr = parts.uri.path();
    let path = Path::new(pathstr);
    let extension = path.extension().map(|ext| ext.to_string_lossy());
    let mut guess = match &extension {
        Some(ext) => mime::from_ext(&ext),
        None => None,
    };

    // Try to figure out what extension we should return based on the user's path
    let mut result_ext = match guess {
        Some(_) => extension,
        None => None,
    };

    let (mut file, name) = match create_random_file(&config.data) {
        Err(err) => {
            error!("Failed to create random file: {}", err);
            return Ok(Response::builder()
                .status(500).body(Body::from(ERR_500_HTML)).unwrap());
        },
        Ok((file, name)) => (file, name),
    };

    info!("Created file '{}/{}'", config.data, name);

    let mut bodysize: usize = 0;
    let mut first = true;
    loop {
        let chunk = match reqbody.next().await {
            Some(chunkres) => match chunkres {
                Err(err) => {
                    error!("Upload file transfer error: {}", err);
                    delete_file(&config.data, &name);
                    return respond_500();
                },
                Ok(chunk) => chunk,
            },
            None => {
                break;
            },
        };

        // If we don't have an extension yet, see if we can guess one from the content
        if result_ext.is_none() && first {
            let (e, g) = mime::ext_from_file_content(&chunk);
            result_ext = e.map(|s| Borrowed(s));
            guess = g;
            first = false;
        }

        if bodysize + chunk.len() > max_file_size as usize {
            error!("Uploaded file exceeds max size ({} bytes)", max_file_size);
            delete_file(&config.data, &name);
            return respond_413();
        }

        bodysize += chunk.len();
        if let Err(err) = file.write(&chunk) {
            error!("File write error: {}", err);
            delete_file(&config.data, &name);
            return respond_500();
        }
    };

    let mut url = config.url.to_string() + "/" + &name;
    if let Some(e) = result_ext {
        url.push_str(".");
        url.push_str(&e);
    }

    // Privacy
    if guess == Some("image/jpeg") {
        exif::strip(&config.data, &name);
    }

    return Ok(Response::builder().status(201)
       .header(header::CONTENT_TYPE, "text/plain; charset=utf-8")
       .header(header::CONTENT_LOCATION, &url)
       .body(Body::from(url + "\n")).unwrap());
}

async fn on_request(config: &Config, req: Request<Body>) -> Result<Response<Body>, Infallible> {
    debug!("{} {}", req.method(), req.uri());

    let res = match req.method() {
        &Method::GET | &Method::HEAD => on_get(&config, req).await,
        &Method::PUT => Ok(on_put(&config, req).await?),
        _ => Ok(respond_404()?),
    };

    if let Err(res) = res {
        error!("Error: {}", res);
        return respond_500();
    } else {
        return Ok(res.unwrap());
    }
}

#[tokio::main]
async fn main() {
    let _ = env_logger::Builder::from_env(env_logger::Env::default().default_filter_or("info")).init();
    debug!("Logger initialized");

    if let Ok(confstr) = fs::read_to_string("config.toml") {
        CONFIG.set(toml::from_str(&confstr).expect("Failed to parse config")).unwrap();
    } else {
        CONFIG.set(Config::default()).unwrap();
    }

    let addr: SocketAddr = CONFIG.get().unwrap().listen.parse()
        .expect("Unable to parse socket address");

    let make_svc = make_service_fn(|_conn| async {
        return Ok::<_, Infallible>(service_fn(
                |req: Request<Body>| on_request(CONFIG.get().unwrap(), req)));
    });

    // Purge thread
    let _purge_thread = thread::spawn(|| {
        let conf = CONFIG.get().unwrap();
        let expiration = Duration::from_secs(
            ((conf.expiration_days as f64) * ((60 * 60 * 24) as f64)) as u64);

        loop {
            purge::purge(&conf.data, expiration);
            thread::sleep(Duration::from_secs(10 * 60));
        }
    });

    let server = Server::bind(&addr).serve(make_svc);

    info!("Server listening on {}", addr);

    if let Err(e) = server.await {
        error!("Server error: {}", e);
        std::process::exit(1);
    }
}