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@ -1,63 +1,161 @@
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mod comment;
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use actix_cors::Cors;
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mod comment; use actix_cors::Cors;
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pub use comment::*;
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mod database;
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pub use database::Database;
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use actix_web::{get, post, web, App, HttpResponse, HttpServer, Responder};
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use std::{env, sync::Mutex};
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use actix_web::{get, post, web, App, HttpResponse, HttpRequest, HttpServer, Responder};
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use std::{env, sync::{Mutex, MutexGuard}};
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use validator::Validate;
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use scraper::{Html, Selector};
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use std::collections::HashMap;
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use serde::Deserialize;
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struct AppState {
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db: Mutex<Database>,
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databases: HashMap<String, Mutex<Database>>,
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}
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#[get("/")]
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async fn get_comments(data: web::Data<AppState>) -> impl Responder {
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let db = match data.db.lock() {
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Ok(db) => db,
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Err(_) => return HttpResponse::InternalServerError().into(),
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fn get_db<'a>(data: &'a web::Data<AppState>, request: &HttpRequest) -> Result<MutexGuard<'a, Database>, HttpResponse> {
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// all the .into() are converting from HttpResponseBuilder to HttpResponse
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let origin = match request.head().headers().get("Origin") {
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Some(origin) => match origin.to_str() {
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Ok(origin) => origin,
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Err(_) => return Err(HttpResponse::BadRequest().into()),
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}
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None => return Err(HttpResponse::BadRequest().into()),
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};
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match data.databases.get(origin) {
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Some(database) => Ok(match database.lock() {
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Ok(database) => database,
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Err(_) => return Err(HttpResponse::InternalServerError().into()),
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}),
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None => return Err(HttpResponse::BadRequest().into()),
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}
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}
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#[get("/{content_id}")]
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async fn get_comments(data: web::Data<AppState>, request: HttpRequest, content_id: web::Path<String>) -> impl Responder {
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let database = match get_db(&data, &request) {
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Ok(database) => database,
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Err(response) => return response,
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};
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HttpResponse::Ok().json(&db.get_comments().unwrap())
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HttpResponse::Ok().json(database.get_comments(&content_id).unwrap())
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}
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#[derive(Deserialize)]
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struct PostCommentsRequest {
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url: String,
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comment: Comment,
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}
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#[post("/")]
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async fn post_comment(data: web::Data<AppState>, bytes: web::Bytes) -> impl Responder {
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async fn post_comment(data: web::Data<AppState>, request: HttpRequest, bytes: web::Bytes) -> impl Responder {
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match String::from_utf8(bytes.to_vec()) {
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Ok(text) => {
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let db = match data.db.lock() {
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Ok(db) => db,
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Err(_) => return HttpResponse::InternalServerError(),
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};
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let comment: Comment = match serde_json::from_str(&text) {
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Ok(comment) => comment,
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Err(_) => return HttpResponse::BadRequest(),
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let PostCommentsRequest { url, comment } = match serde_json::from_str(&text) {
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Ok(req) => req,
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Err(_) => return HttpResponse::BadRequest().into(),
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};
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if comment.validate().is_err() {
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return HttpResponse::BadRequest();
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return HttpResponse::BadRequest().into();
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}
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let origin = match request.head().headers().get("Origin") {
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Some(origin) => match origin.to_str() {
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Ok(origin) => origin,
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// If the Origin is not valid ASCII, it is a bad request not sent from a browser
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Err(_) => return HttpResponse::BadRequest().into(),
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},
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// If there is no Origin header, it is a bad request not sent from a browser
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None => return HttpResponse::BadRequest().into(),
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};
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// Check to see if provided URL is in scope.
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// This is to prevent malicious requests that try to get server to fetch external websites.
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// (requires loop because "labels on blocks are unstable")
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// https://github.com/rust-lang/rust/issues/48594
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'outer: loop {
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for site_root in data.databases.keys() {
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if site_root.starts_with(origin) && url.starts_with(site_root) {
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break 'outer;
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}
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}
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return HttpResponse::BadRequest().into();
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}
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db.create_comment(&comment).unwrap();
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HttpResponse::Ok()
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match get_page_data(&url).await {
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Ok(page_data_option) => match page_data_option {
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Some(page_data) => if page_data.content_id != comment.content_id {
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return HttpResponse::BadRequest().into();
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},
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None => return HttpResponse::BadRequest().into(),
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},
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Err(_) => return HttpResponse::InternalServerError().into(),
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};
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let database = match get_db(&data, &request) {
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Ok(database) => database,
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Err(response) => return response,
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};
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database.create_comment(&comment).unwrap();
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HttpResponse::Ok().into()
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}
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Err(_) => HttpResponse::BadRequest().into(),
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}
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}
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// Contains all page details stored in meta tags.
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// Currently, only content_id, but this is wrapped in this struct
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// to make adding other meta tags, such as locked comments, in the future
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struct PageData {
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content_id: String,
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}
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async fn get_page_data(url: &str) -> Result<Option<PageData>, reqwest::Error> {
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let response = reqwest::get(url).await?;
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if !response.status().is_success() {
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return Ok(None);
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}
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let content = response.text_with_charset("utf-8").await?;
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let document = Html::parse_document(&content);
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let get_meta = |name: &str| -> Option<String> {
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let selector = Selector::parse(&format!("meta[name=\"{}\"]", name)).unwrap();
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match document.select(&selector).next() {
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Some(element) => match element.value().attr("content") {
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Some(value) => Some(value.to_owned()),
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None => return None,
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},
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None => return None,
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}
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};
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return Ok(Some(PageData {
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content_id: match get_meta("soudan-content-id") {
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Some(id) => id,
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None => return Ok(None),
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},
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}))
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}
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#[actix_web::main]
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async fn main() -> Result<(), std::io::Error> {
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let mut domains = Vec::new();
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let testing = {
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let mut testing = false;
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for argument in env::args() {
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let mut args = env::args();
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args.next(); // Skip first, will be executable name
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for argument in args {
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if argument == "--testing" || argument == "-t" {
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testing = true;
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break;
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} else {
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domains.push(argument);
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}
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}
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testing
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};
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let db = Database::new(testing).unwrap();
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let state = web::Data::new(AppState { db: Mutex::new(db) });
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if domains.len() == 0 {
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panic!("At least one domain is required!");
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}
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let mut databases = HashMap::new();
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for domain in domains.iter() {
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databases.insert(domain.to_owned(), Mutex::new(Database::new(testing).unwrap()));
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}
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let state = web::Data::new(AppState { databases });
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HttpServer::new(move || {
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App::new()
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.service(get_comments)
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