src/main.rs

   1 use std::f32::consts::PI;
   2 use std::convert::From;
   3 use std::env;
   4 use std::io::Cursor;
   5 use std::fmt::Display;
   6 use std::fmt;
   7 use std::borrow::BorrowMut;
   8 use std::sync::{Arc, Mutex};
   9 use log::{debug, LevelFilter};
  10 use num_traits::Zero;
  11 use num_traits::cast::AsPrimitive;
  12 use percent_encoding::percent_decode_str;
  13 use actix_web::{middleware::Logger, get, web, App, HttpServer, HttpRequest, HttpResponse, Responder, ResponseError, Result};
  14 use actix_web::body::BoxBody;
  15 use actix_web::http::StatusCode;
  16 use actix_web::cookie::time::OffsetDateTime;
  17 use image::{ImageBuffer, ColorType, Rgb, RgbImage, write_buffer_with_format};
  18 use image::ImageOutputFormat::Png;
  19 use image::imageops::{FilterType, overlay, resize};
  20 use image::error::{LimitError, LimitErrorKind};
  21
  22
  23 const TIMEAVATAR_SIZE_U32: u32 = 6;
  24 const TIMEAVATAR_SIZE_I64: i64 = TIMEAVATAR_SIZE_U32 as i64;
  25
  26 macro_rules! response_image {
  27     ($cursor:expr) => {
  28         HttpResponse::build(StatusCode::OK)
  29             .content_type("image/png")
  30             .body($cursor.into_inner())
  31     }
  32 }
  33
  34 macro_rules! extract_data {
  35     ($req:expr,$n:expr) => {
  36         $req.uri().path().split('/').nth($n).unwrap()
  37     }
  38 }
  39
  40 macro_rules! extract_header {
  41     ($req:expr,$header:expr) => {
  42         match $req.headers().get($header) {
  43             Some(header) => header.to_str().unwrap_or(""),
  44             _ => ""
  45         }
  46     }
  47 }
  48
  49 #[derive(Debug)]
  50 struct ImageError(image::ImageError);
  51
  52 impl ImageError {
  53     fn dimension_error() -> ImageError {
  54         ImageError(image::ImageError::Limits(LimitError::from_kind(LimitErrorKind::DimensionError)))
  55     }
  56 }
  57
  58 impl Display for ImageError {
  59     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
  60         write!(f, "{}", &self.0)
  61     }
  62 }
  63
  64 impl ResponseError for ImageError {
  65     fn status_code(&self) -> StatusCode {
  66         StatusCode::INTERNAL_SERVER_ERROR
  67     }
  68
  69     fn error_response(&self) -> HttpResponse<BoxBody> {
  70         HttpResponse::InternalServerError().body(format!("{}\n", &self))
  71     }
  72 }
  73
  74 impl From<image::ImageError> for ImageError {
  75     fn from(e: image::ImageError) -> Self {
  76         Self(e)
  77     }
  78 }
  79
  80 #[derive(Debug)]
  81 enum CanvasError {
  82     NotExists,
  83     DimensionMismatch((u32, u32)),
  84     ImageError(ImageError)
  85 }
  86
  87 impl Display for CanvasError {
  88     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
  89         write!(f, "Canvas Error: see error_response() for more details")
  90     }
  91 }
  92
  93 impl ResponseError for CanvasError {
  94     fn status_code(&self) -> StatusCode {
  95         match &self {
  96             CanvasError::NotExists => StatusCode::NOT_FOUND,
  97             CanvasError::DimensionMismatch(_) => StatusCode::BAD_REQUEST,
  98             CanvasError::ImageError(e) => e.status_code()
  99         }
 100     }
 101
 102     fn error_response(&self) -> HttpResponse<BoxBody> {
 103         match &self {
 104             CanvasError::NotExists => HttpResponse::NotFound().body("Canvas does not exist."),
 105             CanvasError::DimensionMismatch(dim) =>
 106                 HttpResponse::BadRequest().body(format!("Supplied dimensions don't match the dimensions of existing canvas {:?}.", dim)),
 107             CanvasError::ImageError(e) => e.error_response()
 108         }
 109     }
 110 }
 111
 112 impl From<ImageError> for CanvasError {
 113     fn from(e: ImageError) -> CanvasError {
 114         CanvasError::ImageError(e)
 115     }
 116 }
 117
 118 struct ToRgbIter<'a, T> where T: AsPrimitive<u8> {
 119     iter: &'a mut dyn Iterator<Item = T>
 120 }
 121
 122 impl<'a, T: AsPrimitive<u8>> ToRgbIter<'a, T> {
 123     fn new(iter: &'a mut (dyn Iterator<Item = T>)) -> ToRgbIter<T> {
 124         ToRgbIter { iter }
 125     }
 126 }
 127
 128 impl<T: AsPrimitive<u8> + Zero> Iterator for ToRgbIter<'_, T> {
 129     type Item = Rgb<u8>;
 130     fn next(&mut self) -> Option<Rgb<u8>> {
 131         if let Some(r) = self.iter.next() {
 132             let g = self.iter.next().unwrap_or_else(T::zero);
 133             let b = self.iter.next().unwrap_or_else(T::zero);
 134             Some(Rgb([r.as_(), g.as_(), b.as_()]))
 135         }
 136         else {
 137             None
 138         }
 139     }
 140 }
 141
 142 #[derive(Debug)]
 143 struct Canvas {
 144     pen: usize,
 145     img: RgbImage
 146 }
 147
 148 impl Canvas {
 149     fn new(width: u32, height: u32) -> Canvas {
 150         Canvas { pen: 0, img: ImageBuffer::new(width, height) }
 151     }
 152
 153     /*fn from_image(img: RgbImage) -> Canvas {
 154         Canvas { pen: 0, img }
 155     }
 156
 157     fn replace(&self, img: RgbImage, pen: usize) -> Canvas {
 158         self.img = img;
 159         self.pen = pen;
 160         self
 161     }*/
 162
 163     fn advance_pen(mut self, offset: usize) -> Canvas {
 164         //Canvas { pen: self.pen + offset, img: self.img }
 165         self.pen += offset;
 166         self.pen %= self.img.width() as usize * self.img.height() as usize;
 167         self
 168     }
 169 }
 170
 171 struct Canvas0(Option<Canvas>);
 172 struct Canvas1(Option<Canvas>);
 173 struct Canvas2(Option<Canvas>);
 174
 175 #[get("/hello/{name}")]
 176 async fn greet(name: web::Path<String>, req: HttpRequest) -> impl Responder {
 177     println!("{:?}", req);
 178     format!("Hello {name}!\n{:?}", req.headers().get("user-agent"))
 179 }
 180
 181 fn rgb_encode_with_pen(img: &mut RgbImage, pen: usize, data: &mut dyn Iterator<Item = u8>) -> Result<usize, ImageError> {
 182     let mut pixels = img.pixels_mut().skip(pen);
 183     let mut counter = 0;
 184
 185     for sp in ToRgbIter::new(data) {
 186         let mut dp = match pixels.next() {
 187             Some(pixel) => pixel,
 188             None => {
 189                 pixels = img.pixels_mut().skip(0);
 190                 pixels.next().ok_or_else(ImageError::dimension_error)?
 191             }
 192         };
 193         dp.0 = sp.0;
 194         counter += 1;
 195     }
 196
 197     Ok(counter)
 198 }
 199
 200 fn rgb_encode_to_canvas(mut canvas: Canvas, data: &mut dyn Iterator<Item = u8>) -> Result<Canvas, CanvasError> {
 201     let counter = rgb_encode_with_pen(&mut canvas.img, canvas.pen, data)?;
 202     Ok(canvas.advance_pen(counter))
 203 }
 204
 205 fn rgb_encode(mut img: RgbImage, data: &mut dyn Iterator<Item = u8>) -> Result<RgbImage, ImageError> {
 206     rgb_encode_with_pen(&mut img, 0, data)?;
 207     Ok(img)
 208 }
 209
 210 fn sine_encode(mut img: RgbImage, wave_offset: (u32, u32), amplitude: f32, freq_base: f32, run: u32, wave_color: Rgb<u8>,
 211     data: &mut dyn Iterator<Item = u8>) -> Result<RgbImage, ImageError>
 212 {
 213     let run: f32 = run as f32;
 214     let (wave_offset_x, wave_offset_y) = wave_offset;
 215     let (wave_offset_x, wave_offset_y) = (wave_offset_x as f32, wave_offset_y as f32);
 216     let signal = &mut data.peekable();
 217     let mut x: f32 = wave_offset_x as f32;
 218     let max_x: f32 = (img.width() - 1) as f32;
 219     let max_y: f32 = img.height() as f32;
 220     while signal.peek().is_some() && (x < max_x) {
 221         let px = x;
 222         let s = signal.next().unwrap_or(0);
 223         while ((x - px) < run) && (x < max_x) {
 224             let y = if s != 0 {
 225                 (2.0 * PI * freq_base * x * s as f32).sin() * amplitude + wave_offset_y
 226             }
 227             else { wave_offset_y };
 228             x += 0.001;
 229             if (y > 0.0) && (y < max_y) {
 230                 img.put_pixel(x as u32, y as u32, wave_color);
 231             }
 232         }
 233     }
 234     Ok(img)
 235 }
 236
 237 fn apply_to_canvas<'a, F>(f: F, canvas_option: &'a mut Option<Canvas>, dimensions: Option<(u32, u32)>, data: &str) -> Result<&'a mut Canvas, CanvasError>
 238     where F: Fn(Canvas, &mut dyn Iterator<Item = u8>) -> Result<Canvas, CanvasError>
 239 {
 240     let canvas = match canvas_option.take() {
 241         Some(canvas) => match dimensions {
 242             Some(dimensions) => {
 243                 if dimensions == canvas.img.dimensions() {
 244                     Ok(canvas)
 245                 }
 246                 else {
 247                     Err(CanvasError::DimensionMismatch(canvas_option.insert(canvas).img.dimensions()))
 248                 }
 249             },
 250             None =>
 251                 Ok(canvas)
 252         },
 253         None => match dimensions {
 254             Some((dim_x, dim_y)) =>
 255                 Ok(Canvas::new(dim_x, dim_y)),
 256             None =>
 257                 Err(CanvasError::NotExists)
 258         }
 259     }?;
 260
 261     Ok(canvas_option.insert(f(canvas, percent_decode_str(data).into_iter().borrow_mut())?))
 262 }
 263
 264 fn make_png<F>(dim_x: u32, dim_y: u32, scale: u32, data: &mut dyn Iterator<Item = u8>, encode: F) -> Result<Cursor<Vec<u8>>, ImageError>
 265     where F: Fn(RgbImage, &mut dyn Iterator<Item = u8>) -> Result<RgbImage, ImageError>
 266 {
 267     // Image must not be larger than 1 megapixel
 268     if dim_x * dim_y * scale > 1048576 {
 269         return Err(ImageError::dimension_error())
 270     }
 271
 272     let img: RgbImage = encode(ImageBuffer::new(dim_x, dim_y), data)?;
 273     let cursor = image_to_cursor(img, scale)?;
 274     Ok(cursor)
 275 }
 276
 277 fn image_to_cursor(img: RgbImage, scale: u32) -> Result<Cursor<Vec<u8>>, ImageError> {
 278     let (dim_x, dim_y) = img.dimensions();
 279     let (dim_x, dim_y) = (dim_x * scale, dim_y * scale);
 280
 281     // Image must not be larger than 1 megapixel
 282     if dim_x * dim_y > 1048576 {
 283         return Err(ImageError::dimension_error())
 284     }
 285
 286     let mut cursor = Cursor::new(Vec::new());
 287     let img = resize(&img, dim_x, dim_y, FilterType::Nearest);
 288     write_buffer_with_format(&mut cursor, &img, dim_x, dim_y, ColorType::Rgb8, Png)?;
 289     Ok(cursor)
 290 }
 291
 292
 293 #[get("/gen/0/{data}")]
 294 async fn img_gen0(req: HttpRequest) -> Result<impl Responder> {
 295     let data = extract_data!(req, 3);
 296     let cursor = make_png(32, 32, 16, percent_decode_str(data).into_iter().borrow_mut(), rgb_encode)?;
 297     Ok(response_image!(cursor))
 298 }
 299
 300 #[get("/gen/1/{dim_x}/{dim_y}/{scale}/{data}")]
 301 async fn img_gen1(req: HttpRequest, path: web::Path<(u32, u32, u32)>) -> Result<impl Responder> {
 302     let (dim_x, dim_y, scale) = path.into_inner();
 303     let data = extract_data!(req, 6);
 304     let cursor = make_png(dim_x, dim_y, scale, percent_decode_str(data).into_iter().borrow_mut(), rgb_encode)?;
 305     Ok(response_image!(cursor))
 306 }
 307
 308 #[get("/gen/2/{dim_x}/{dim_y}/{scale}")]
 309 async fn img_gen2(req: HttpRequest, path: web::Path<(u32, u32, u32)>) -> Result<impl Responder> {
 310     let (dim_x, dim_y, scale) = path.into_inner();
 311     let data = extract_header!(req, "user-agent");
 312     let cursor = make_png(dim_x, dim_y, scale, &mut data.bytes(), rgb_encode)?;
 313     Ok(response_image!(cursor))
 314 }
 315
 316 #[get("/gen/3/{scale}")]
 317 async fn img_gen3(req: HttpRequest, path: web::Path<u32>) -> Result<impl Responder> {
 318     let scale = path.into_inner();
 319     let data = extract_header!(req, "user-agent");
 320     let rgbimg: RgbImage = rgb_encode(ImageBuffer::new(TIMEAVATAR_SIZE_U32, TIMEAVATAR_SIZE_U32), &mut data.bytes())?;
 321     let mut resimg: RgbImage = ImageBuffer::new(60 * TIMEAVATAR_SIZE_U32, 24 * TIMEAVATAR_SIZE_U32);
 322     let time = OffsetDateTime::now_utc().time();
 323     let (hour, minute): (i64, i64) = (time.hour().into(), time.minute().into());
 324     overlay(&mut resimg, &rgbimg, minute * TIMEAVATAR_SIZE_I64, hour * TIMEAVATAR_SIZE_I64);
 325     let cursor = image_to_cursor(resimg, scale)?;
 326     Ok(response_image!(cursor))
 327 }
 328
 329 #[get("/gen/4/{dim_x}/{dim_y}/{scale}/{wave_offset_x}/{wave_offset_y}/{amplitude}/{freq}/{run}/{wave_color}/{data}")]
 330 #[allow(clippy::type_complexity)]
 331 async fn img_gen4(req: HttpRequest, path: web::Path<(u32, u32, u32, u32, u32, f32, f32, u32)>) -> Result<impl Responder> {
 332     let (dim_x, dim_y, scale, wave_offset_x, wave_offset_y, amplitude, freq_base, run) = path.into_inner();
 333     let freq_base = freq_base / 1000.0;
 334     let wave_color = extract_data!(req, 11);
 335     debug!("Wave color input: {:?}", wave_color);
 336     let wave_color = ToRgbIter::new(&mut percent_decode_str(wave_color)).next().unwrap_or(Rgb([255, 255, 255]));
 337     debug!("Decoded color: {:?}", wave_color);
 338     let signal = &mut percent_decode_str(extract_data!(req, 12));
 339     let cursor = make_png(dim_x, dim_y, scale, signal,
 340         |img, signal| sine_encode(img, (wave_offset_x, wave_offset_y), amplitude, freq_base, run, wave_color, signal))?;
 341     Ok(response_image!(cursor))
 342 }
 343
 344 #[get("/pgen/0/{data}")]
 345 async fn img_pgen0(req: HttpRequest, canvas0: web::Data<Arc<Mutex<Canvas0>>>) -> Result<impl Responder> {
 346     let data = extract_data!(req, 3);
 347     let scale = 16;
 348     let img: RgbImage = ({
 349         let canvas_option = &mut *canvas0.lock().unwrap();
 350         Ok(apply_to_canvas( |c, d| rgb_encode_to_canvas(c, d), &mut canvas_option.0, None, data)?.img.clone())
 351     } as Result<RgbImage, CanvasError>)?;
 352     let cursor = image_to_cursor(img, scale)?;
 353     Ok(response_image!(cursor))
 354 }
 355
 356 #[get("/pgen/1/{dim_x}/{dim_y}/{scale}/{data}")]
 357 async fn img_pgen1(req: HttpRequest, path: web::Path<(u32, u32, u32)>, canvas1: web::Data<Arc<Mutex<Canvas1>>>) -> Result<impl Responder> {
 358     let (dim_x, dim_y, scale) = path.into_inner();
 359     let data = extract_data!(req, 6);
 360     let img: RgbImage = ({
 361         let canvas_option = &mut *canvas1.lock().unwrap();
 362         Ok(apply_to_canvas( |c, d| rgb_encode_to_canvas(c, d), &mut canvas_option.0, Some((dim_x, dim_y)), data)?.img.clone())
 363     } as Result<RgbImage, CanvasError>)?;
 364     let cursor = image_to_cursor(img, scale)?;
 365     Ok(response_image!(cursor))
 366 }
 367
 368 #[get("/pgen/2/{dim_x}/{dim_y}/{scale}")]
 369 async fn img_pgen2(req: HttpRequest, path: web::Path<(u32, u32, u32)>, canvas1: web::Data<Arc<Mutex<Canvas1>>>) -> Result<impl Responder> {
 370     let (dim_x, dim_y, scale) = path.into_inner();
 371     let data = extract_header!(req, "user-agent");
 372     let img: RgbImage = ({
 373         let canvas_option = &mut *canvas1.lock().unwrap();
 374         Ok(apply_to_canvas( |c, d| rgb_encode_to_canvas(c, d), &mut canvas_option.0, Some((dim_x, dim_y)), data)?.img.clone())
 375     } as Result<RgbImage, CanvasError>)?;
 376     let cursor = image_to_cursor(img, scale)?;
 377     Ok(response_image!(cursor))
 378 }
 379
 380 #[get("/pgen/3/{scale}")]
 381 async fn img_pgen3(req: HttpRequest, path: web::Path<u32>, canvas2: web::Data<Arc<Mutex<Canvas2>>>) -> Result<impl Responder> {
 382     let scale = path.into_inner();
 383     let data = extract_header!(req, "user-agent");
 384     let time = OffsetDateTime::now_utc().time();
 385     let (hour, minute): (i64, i64) = (time.hour().into(), time.minute().into());
 386     let rgbimg: RgbImage = rgb_encode(ImageBuffer::new(TIMEAVATAR_SIZE_U32, TIMEAVATAR_SIZE_U32), &mut data.bytes())?;
 387     let resimg: RgbImage = ({
 388         let canvas_option = &mut *canvas2.lock().unwrap();
 389         let mut canvas = match canvas_option.0.take() {
 390             Some(canvas) => canvas,
 391             None => Canvas::new(60 * TIMEAVATAR_SIZE_U32, 24 * TIMEAVATAR_SIZE_U32)
 392         };
 393         overlay(&mut canvas.img, &rgbimg, minute * TIMEAVATAR_SIZE_I64, hour * TIMEAVATAR_SIZE_I64);
 394         Ok(canvas_option.0.insert(canvas).img.clone())
 395     } as Result<RgbImage, CanvasError>)?;
 396     let cursor = image_to_cursor(resimg, scale)?;
 397     Ok(response_image!(cursor))
 398 }
 399
 400 #[get("/pdrop/{canvas_id}")]
 401 async fn pdrop(canvas_id: web::Path<u8>,
 402     canvas0: web::Data<Arc<Mutex<Canvas0>>>,
 403     canvas1: web::Data<Arc<Mutex<Canvas1>>>,
 404     canvas2: web::Data<Arc<Mutex<Canvas2>>>) -> Result<impl Responder> {
 405
 406     let canvas_id = canvas_id.into_inner();
 407     match canvas_id {
 408         0 => canvas0.lock().unwrap().0.take(),
 409         1 => canvas1.lock().unwrap().0.take(),
 410         2 => canvas2.lock().unwrap().0.take(),
 411         _ => None
 412     }.ok_or(CanvasError::NotExists)?;
 413     Ok(HttpResponse::build(StatusCode::OK)
 414        .body(format!("Canvas {} dropped.", canvas_id)))
 415 }
 416
 417
 418 #[actix_web::main] // or #[tokio::main]
 419 async fn main() -> std::io::Result<()> {
 420     env_logger::builder()
 421         .filter_module("actix_web", LevelFilter::Info)
 422         .parse_default_env()
 423         .init();
 424
 425     let listenaddress = env::args().nth(1).unwrap_or_else(|| "127.0.0.1:8080".to_string());
 426     let canvas0 = Arc::new(Mutex::new(Canvas0(Some(Canvas::new(32, 32)))));
 427     let canvas1 = Arc::new(Mutex::new(Canvas1(None)));
 428     let canvas2 = Arc::new(Mutex::new(Canvas2(None)));
 429
 430     HttpServer::new(move || {
 431         App::new()
 432             .wrap(Logger::default())
 433             .service(greet)
 434             .service(img_gen0)
 435             .service(img_gen1)
 436             .service(img_gen2)
 437             .service(img_gen3)
 438             .service(img_gen4)
 439             .service(img_pgen0)
 440             .service(img_pgen1)
 441             .service(img_pgen2)
 442             .service(img_pgen3)
 443             .service(pdrop)
 444             .app_data(web::Data::new(canvas0.clone()))
 445             .app_data(web::Data::new(canvas1.clone()))
 446             .app_data(web::Data::new(canvas2.clone()))
 447     })
 448     .bind(listenaddress)?
 449     .run()
 450     .await
 451 }