use anyhow::{Context, Result}; use hyper::header::CONTENT_TYPE; use hyper::service::{make_service_fn, service_fn}; use hyper::{Body, Method, Request, Response, Server, StatusCode}; use multer::Multipart; use nanoid::nanoid; use rusqlite::{params, Connection, OpenFlags, NO_PARAMS}; use url::form_urlencoded; use std::collections::HashMap; use std::path::Path; fn respond_with_shortlink>(shortlink: S) -> Response { Response::builder() .status(StatusCode::OK) .header("content-type", "text/html") .body(Body::from(shortlink.as_ref().to_string())) .unwrap() } fn respond_with_status(s: StatusCode) -> Response { Response::builder().status(s).body(Body::empty()).unwrap() } fn shorten>(url: S, conn: &mut Connection) -> Result { let mut stmt = conn.prepare("select * from urls where link = ?1")?; let mut rows = stmt.query(params![url.as_ref().to_string()])?; if let Some(row) = rows.next()? { return Ok(row.get(1)?); } else { let new_id = nanoid!(4); conn.execute( "insert into urls (link, shortlink) values (?1, ?2)", params![url.as_ref().to_string(), new_id], )?; return Ok(new_id); } } fn get_link>(url: S, conn: &mut Connection) -> Result> { let url = url.as_ref(); let mut stmt = conn.prepare("select * from urls where shortlink = ?1")?; let mut rows = stmt.query(params![url.to_string()])?; if let Some(row) = rows.next()? { return Ok(row.get(0)?); } else { return Ok(None); } } async fn process_multipart( body: Body, boundary: String, conn: &mut Connection, ) -> Result> { let mut m = Multipart::new(body, boundary); if let Some(field) = m.next_field().await? { if field.name() == Some("shorten") { let content = field .text() .await .with_context(|| format!("Expected field name"))?; let shortlink = shorten(content, conn)?; return Ok(respond_with_shortlink(shortlink)); } } Ok(Response::builder() .status(StatusCode::OK) .body(Body::empty())?) } async fn shortner_service(req: Request) -> Result> { let mut conn = init_db("./urls.db_3").unwrap(); match req.method() { &Method::POST => { let boundary = req .headers() .get(CONTENT_TYPE) .and_then(|ct| ct.to_str().ok()) .and_then(|ct| multer::parse_boundary(ct).ok()); if boundary.is_none() { let b = hyper::body::to_bytes(req) .await .with_context(|| format!("Failed to stream request body!"))?; let params = form_urlencoded::parse(b.as_ref()) .into_owned() .collect::>(); if let Some(n) = params.get("shorten") { let s = shorten(n, &mut conn)?; return Ok(respond_with_shortlink(s)); } else { return Ok(respond_with_status(StatusCode::UNPROCESSABLE_ENTITY)); } } return process_multipart(req.into_body(), boundary.unwrap(), &mut conn).await; } &Method::GET => { let shortlink = req.uri().path().to_string(); let link = get_link(&shortlink[1..], &mut conn); if let Some(l) = link.unwrap() { Ok(Response::builder() .header("Location", &l) .header("content-type", "text/html") .status(StatusCode::MOVED_PERMANENTLY) .body(Body::from(format!( "You will be redirected to: {}. If not, click the link.", &l )))?) } else { Ok(Response::builder() .status(StatusCode::NOT_FOUND) .body(Body::empty())?) } } _ => { return Ok(Response::builder() .status(StatusCode::NOT_FOUND) .body(Body::empty())?) } } } fn init_db>(p: P) -> Result { let conn = Connection::open_with_flags( p, OpenFlags::SQLITE_OPEN_CREATE | OpenFlags::SQLITE_OPEN_READ_WRITE, )?; conn.execute( "CREATE TABLE IF NOT EXISTS urls ( link TEXT PRIMARY KEY, shortlink TEXT NOT NULL )", NO_PARAMS, )?; return Ok(conn); } fn main() -> Result<()> { smol::run(async { let addr = ([127, 0, 0, 1], 3000).into(); let service = make_service_fn(|_| async { Ok::<_, hyper::Error>(service_fn(shortner_service)) }); let server = Server::bind(&addr).serve(service); println!("Listening on http://{}", addr); server.await.unwrap(); Ok(()) }) }