wry 0.33.0

Cross-platform WebView rendering library
Documentation 
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// Copyright 2020-2023 Tauri Programme within The Commons Conservancy
// SPDX-License-Identifier: Apache-2.0
// SPDX-License-Identifier: MIT

use std::{
  fs::{canonicalize, read},
  path::PathBuf,
};

use http::Request;
use wry::{
  application::{
    event::{Event, StartCause, WindowEvent},
    event_loop::{ControlFlow, EventLoop},
    window::WindowBuilder,
  },
  http::{header::CONTENT_TYPE, Response},
  webview::WebViewBuilder,
};

const PAGE1_HTML: &[u8] = include_bytes!("custom_protocol_page1.html");

fn main() -> wry::Result<()> {
  let event_loop = EventLoop::new();
  let window = WindowBuilder::new()
    .with_title("Custom Protocol")
    .build(&event_loop)
    .unwrap();

  let _webview = WebViewBuilder::new(window)
    .unwrap()
    .with_asynchronous_custom_protocol("wry".into(), move |request, responder| {
      match get_wry_response(request) {
        Ok(http_response) => responder.respond(http_response),
        Err(e) => responder.respond(
          http::Response::builder()
            .header(CONTENT_TYPE, "text/plain")
            .status(500)
            .body(e.to_string().as_bytes().to_vec())
            .unwrap(),
        ),
      }
    })
    // tell the webview to load the custom protocol
    .with_url("wry://localhost")?
    .build()?;

  event_loop.run(move |event, _, control_flow| {
    *control_flow = ControlFlow::Wait;

    match event {
      Event::NewEvents(StartCause::Init) => println!("Wry application started!"),
      Event::WindowEvent {
        event: WindowEvent::CloseRequested,
        ..
      } => *control_flow = ControlFlow::Exit,
      _ => (),
    }
  });
}

fn get_wry_response(
  request: Request<Vec<u8>>,
) -> Result<http::Response<Vec<u8>>, Box<dyn std::error::Error>> {
  let path = request.uri().path();
  // Read the file content from file path
  let content = if path == "/" {
    PAGE1_HTML.into()
  } else {
    // `1..` for removing leading slash
    read(canonicalize(PathBuf::from("examples").join(&path[1..]))?)?
  };

  // Return asset contents and mime types based on file extentions
  // If you don't want to do this manually, there are some crates for you.
  // Such as `infer` and `mime_guess`.
  let mimetype = if path.ends_with(".html") || path == "/" {
    "text/html"
  } else if path.ends_with(".js") {
    "text/javascript"
  } else if path.ends_with(".png") {
    "image/png"
  } else if path.ends_with(".wasm") {
    "application/wasm"
  } else {
    unimplemented!();
  };

  Response::builder()
    .header(CONTENT_TYPE, mimetype)
    .body(content)
    .map_err(Into::into)
}