Hands-On Microservices with Rust

Downloading images

Let's implement a branch to download images. The handler can download files using the  /download/filename path. To extract the name of the file, we use a regular expression:

lazy_static! {    static ref DOWNLOAD_FILE: Regex = Regex::new("^/download/(?P<filename>\\w{20})?$").unwrap();}

We will use startwith to detect the /download part of the path. Take a look at the implementation:

(&Method::GET, path) if path.starts_with("/download") => {    if let Some(cap) = DOWNLOAD_FILE.captures(path) {            let filename = cap.name("filename").unwrap().as_str();            let mut filepath = files.to_path_buf();            filepath.push(filename);            let open_file = File::open(filepath);            let body = open_file.map(|file| {                let chunks = FileChunkStream::new(file); Response::new(Body::wrap_stream(chunks)) ...