From e16743598ccdaae9709034a7215c35ccfe2a49fa Mon Sep 17 00:00:00 2001 From: Akshay Date: Sun, 23 Aug 2020 20:02:53 +0530 Subject: refactor src into db and service --- src/service.rs | 121 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 121 insertions(+) create mode 100644 src/service.rs (limited to 'src/service.rs') diff --git a/src/service.rs b/src/service.rs new file mode 100644 index 0000000..55a42bf --- /dev/null +++ b/src/service.rs @@ -0,0 +1,121 @@ +use anyhow::{Context, Result}; +use hyper::header::CONTENT_TYPE; +use hyper::{Body, Method, Request, Response, StatusCode}; +use multer::Multipart; +use nanoid::nanoid; +use rusqlite::{params, Connection}; +use url::form_urlencoded; + +use std::collections::HashMap; + +use crate::db::init_db; + +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())?) +} + +pub 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(respond_with_status(StatusCode::NOT_FOUND)) + } + } + _ => Ok(respond_with_status(StatusCode::NOT_FOUND)), + } +} -- cgit v1.2.3