ebook-rs 0.5.2

Pure Rust EPUB parser and reader engine with CFI location mapping, full-text search, font de-obfuscation, and WASM/HTTP reader support.
Documentation 
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use crate::annotations::Annotation;
use crate::book::Book;
use crate::web_ui::READER_HTML;
use std::sync::{Arc, Mutex};
use tiny_http::{Header, Response, Server, StatusCode};
use url::Url;

/// Embedded HTTP Reader Server.
pub struct ReaderServer {
    book: Arc<Mutex<Book>>,
    port: u16,
}

impl ReaderServer {
    pub fn new(book: Book, port: u16) -> Self {
        Self {
            book: Arc::new(Mutex::new(book)),
            port,
        }
    }

    /// Start listening and serving incoming HTTP requests.
    /// P6 & B7 Fix: Thread-pool request dispatching with mutex poison protection.
    pub fn listen(&self) -> Result<(), String> {
        let addr = format!("127.0.0.1:{}", self.port);
        let server = Arc::new(
            Server::http(&addr)
                .map_err(|e| format!("Failed to start server on {}: {}", addr, e))?,
        );
        println!(
            "🚀 EBook-RS Reader Server listening on http://localhost:{}",
            self.port
        );
        println!("Press Ctrl+C to exit.");

        for mut request in server.incoming_requests() {
            let book_arc = Arc::clone(&self.book);

            // P6 Fix: Dispatch request handling to a background thread to prevent slow requests from blocking HTTP loop
            std::thread::spawn(move || {
                let url_str = format!("http://localhost{}", request.url());
                let parsed_url = Url::parse(&url_str)
                    .unwrap_or_else(|_| Url::parse("http://localhost/").unwrap());
                let path = parsed_url.path();

                match path {
                    "/" | "/index.html" => {
                        let header = Header::from_bytes(
                            &b"Content-Type"[..],
                            &b"text/html; charset=utf-8"[..],
                        )
                        .unwrap();
                        let response = Response::from_string(READER_HTML).with_header(header);
                        let _ = request.respond(response);
                    }
                    "/api/book/metadata" => {
                        // B7 Fix: Use into_inner on poison error to prevent server crash
                        let book = book_arc.lock().unwrap_or_else(|e| e.into_inner());
                        let json = serde_json::to_string(book.metadata()).unwrap_or_default();
                        let header =
                            Header::from_bytes(&b"Content-Type"[..], &b"application/json"[..])
                                .unwrap();
                        let _ = request.respond(Response::from_string(json).with_header(header));
                    }
                    "/api/book/toc" => {
                        let book = book_arc.lock().unwrap_or_else(|e| e.into_inner());
                        let json = serde_json::to_string(book.toc()).unwrap_or_default();
                        let header =
                            Header::from_bytes(&b"Content-Type"[..], &b"application/json"[..])
                                .unwrap();
                        let _ = request.respond(Response::from_string(json).with_header(header));
                    }
                    "/api/book/spine" => {
                        let book = book_arc.lock().unwrap_or_else(|e| e.into_inner());
                        let json = serde_json::to_string(book.spine()).unwrap_or_default();
                        let header =
                            Header::from_bytes(&b"Content-Type"[..], &b"application/json"[..])
                                .unwrap();
                        let _ = request.respond(Response::from_string(json).with_header(header));
                    }
                    _ if path.starts_with("/api/book/section/") => {
                        let idx_str = path.trim_start_matches("/api/book/section/");
                        let idx: usize = idx_str.parse().unwrap_or(0);
                        let book = book_arc.lock().unwrap_or_else(|e| e.into_inner());

                        match book.get_section(idx) {
                            Ok(sec) => {
                                let header = Header::from_bytes(
                                    &b"Content-Type"[..],
                                    &b"text/html; charset=utf-8"[..],
                                )
                                .unwrap();
                                let _ = request.respond(
                                    Response::from_string(&sec.processed_html).with_header(header),
                                );
                            }
                            Err(err) => {
                                let _ = request.respond(
                                    Response::from_string(err).with_status_code(StatusCode(404)),
                                );
                            }
                        }
                    }
                    "/api/book/search" => {
                        let query = parsed_url
                            .query_pairs()
                            .find(|(k, _)| k == "q")
                            .map(|(_, v)| v.to_string())
                            .unwrap_or_default();

                        let book = book_arc.lock().unwrap_or_else(|e| e.into_inner());
                        let results = book.search(&query);
                        let json = serde_json::to_string(&results).unwrap_or_default();
                        let header =
                            Header::from_bytes(&b"Content-Type"[..], &b"application/json"[..])
                                .unwrap();
                        let _ = request.respond(Response::from_string(json).with_header(header));
                    }
                    "/api/book/locations" => {
                        let book = book_arc.lock().unwrap_or_else(|e| e.into_inner());
                        let json = serde_json::to_string(&book.locations).unwrap_or_default();
                        let header =
                            Header::from_bytes(&b"Content-Type"[..], &b"application/json"[..])
                                .unwrap();
                        let _ = request.respond(Response::from_string(json).with_header(header));
                    }
                    "/api/book/cover" => {
                        let book = book_arc.lock().unwrap_or_else(|e| e.into_inner());
                        if let Some((bytes, mime)) = book.cover_image() {
                            let header =
                                Header::from_bytes(&b"Content-Type"[..], mime.as_bytes()).unwrap();
                            let _ = request.respond(Response::from_data(bytes).with_header(header));
                        } else {
                            let _ = request.respond(
                                Response::from_string("No cover found")
                                    .with_status_code(StatusCode(404)),
                            );
                        }
                    }
                    "/api/annotations" => {
                        if request.method() == &tiny_http::Method::Post {
                            let mut body_str = String::new();
                            let _ = request.as_reader().read_to_string(&mut body_str);
                            if let Ok(ann) = serde_json::from_str::<Annotation>(&body_str) {
                                let mut book = book_arc.lock().unwrap_or_else(|e| e.into_inner());
                                book.annotations.add(ann);
                                let header = Header::from_bytes(
                                    &b"Content-Type"[..],
                                    &b"application/json"[..],
                                )
                                .unwrap();
                                let _ = request.respond(
                                    Response::from_string("{\"status\":\"ok\"}")
                                        .with_header(header),
                                );
                            } else {
                                let _ = request.respond(
                                    Response::from_string("Invalid JSON")
                                        .with_status_code(StatusCode(400)),
                                );
                            }
                        } else {
                            let book = book_arc.lock().unwrap_or_else(|e| e.into_inner());
                            let json =
                                serde_json::to_string(&book.annotations.list()).unwrap_or_default();
                            let header =
                                Header::from_bytes(&b"Content-Type"[..], &b"application/json"[..])
                                    .unwrap();
                            let _ =
                                request.respond(Response::from_string(json).with_header(header));
                        }
                    }
                    _ => {
                        let _ = request.respond(
                            Response::from_string("404 Not Found")
                                .with_status_code(StatusCode(404)),
                        );
                    }
                }
            });
        }

        Ok(())
    }
}