index : static-web-server.git

use iron::mime;
use iron::prelude::*;
use iron_cors::CorsMiddleware;
use std::collections::HashSet;
use std::time::Duration;

use crate::error_page::ErrorPage;
use crate::gzip::GzipMiddleware;
use crate::helpers;
use crate::logger::{log_server, Logger};
use crate::staticfile_middleware::{Cache, GuessContentType, ModifyWith, Prefix, Staticfile};

/// An Iron middleware for static files-serving.
pub struct StaticFiles {
    opts: StaticFilesOptions,
}

pub struct StaticFilesOptions {
    pub root_dir: String,
    pub assets_dir: String,
    pub page_50x_path: String,
    pub page_404_path: String,
    pub cors_allow_origins: String,
}

impl StaticFiles {
    /// Create a new instance of `StaticFiles` with given options.
    pub fn new(opts: StaticFilesOptions) -> StaticFiles {
        StaticFiles { opts }
    }

    /// Handle static files for current `StaticFiles` middleware.
    pub fn handle(&self) -> Chain {
        // Check the root directory
        let root_dir = &match helpers::get_valid_dirpath(&self.opts.root_dir) {
            Err(e) => {
                error!("{}", e);
                std::process::exit(1)
            }
            Ok(v) => v,
        };

        // Check the assets directory
        let assets_dir = &match helpers::get_valid_dirpath(&self.opts.assets_dir) {
            Err(e) => {
                error!("{}", e);
                std::process::exit(1)
            }
            Ok(v) => v,
        };

        // Get the assets directory name
        let assets_dirname = &match helpers::get_dirname(assets_dir) {
            Err(e) => {
                error!("{}", e);
                std::process::exit(1)
            }
            Ok(v) => v,
        };

        // Define middleware chain
        let mut chain = Chain::new(
            Staticfile::new(root_dir, assets_dir).expect("Directory to serve files was not found"),
        );
        let one_day = Duration::new(60 * 60 * 24, 0);
        let one_year = Duration::new(60 * 60 * 24 * 365, 0);
        let default_content_type = "text/html"
            .parse::<mime::Mime>()
            .expect("Unable to create a default content type header");

        // CORS support
        let allowed_hosts = &self.opts.cors_allow_origins;

        if !allowed_hosts.is_empty() {
            log_server("CORS enabled");
            log_server(&format!("Access-Control-Allow-Origin: {}", allowed_hosts));

            if allowed_hosts == "*" {
                chain.link_around(CorsMiddleware::with_allow_any());
            } else {
                let allowed_hosts = allowed_hosts
                    .split(',')
                    .map(|s| s.to_string())
                    .collect::<HashSet<_>>();
                chain.link_around(CorsMiddleware::with_whitelist(allowed_hosts));
            };
        }

        chain.link_after(ModifyWith::new(Cache::new(one_day)));
        chain.link_after(Prefix::new(&[assets_dirname], Cache::new(one_year)));
        chain.link_after(GuessContentType::new(default_content_type));
        chain.link_after(GzipMiddleware);
        chain.link_after(Logger);
        chain.link_after(ErrorPage::new(
            &self.opts.page_404_path,
            &self.opts.page_50x_path,
        ));
        chain
    }
}