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_color {
  41     ($req:expr,$n:expr) => {
  42         {
  43             let data_raw = extract_data!($req, $n);
  44             let mut data_decoded = percent_decode_str(data_raw);
  45             let mut rgb = ToRgbIter::new(&mut data_decoded);
  46             let color = rgb.next().ok_or(ColorError(data_raw.to_owned()))?;
  47             match rgb.next() {
  48                 Some(_) => Err(ColorError(data_raw.to_owned())),
  49                 _ => Ok(color)
  50             }
  51         }
  52     }
  53 }
  54
  55 macro_rules! extract_header {
  56     ($req:expr,$header:expr) => {
  57         match $req.headers().get($header) {
  58             Some(header) => header.to_str().unwrap_or(""),
  59             _ => ""
  60         }
  61     }
  62 }
  63
  64 #[derive(Debug)]
  65 struct ColorError(String);
  66
  67 impl Display for ColorError {
  68     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
  69         write!(f, "Invalid color specification: {}", &self.0)
  70     }
  71 }
  72
  73 impl ResponseError for ColorError {
  74     fn status_code(&self) -> StatusCode {
  75         StatusCode::INTERNAL_SERVER_ERROR
  76     }
  77
  78     fn error_response(&self) -> HttpResponse<BoxBody> {
  79         HttpResponse::InternalServerError().body(format!("{}\n", &self))
  80     }
  81 }
  82
  83 #[derive(Debug)]
  84 struct ImageError(image::ImageError);
  85
  86 impl ImageError {
  87     fn dimension_error() -> ImageError {
  88         ImageError(image::ImageError::Limits(LimitError::from_kind(LimitErrorKind::DimensionError)))
  89     }
  90 }
  91
  92 impl Display for ImageError {
  93     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
  94         write!(f, "{}", &self.0)
  95     }
  96 }
  97
  98 impl ResponseError for ImageError {
  99     fn status_code(&self) -> StatusCode {
 100         StatusCode::INTERNAL_SERVER_ERROR
 101     }
 102
 103     fn error_response(&self) -> HttpResponse<BoxBody> {
 104         HttpResponse::InternalServerError().body(format!("{}\n", &self))
 105     }
 106 }
 107
 108 impl From<image::ImageError> for ImageError {
 109     fn from(e: image::ImageError) -> Self {
 110         Self(e)
 111     }
 112 }
 113
 114 #[derive(Debug)]
 115 enum CanvasError {
 116     NotExists,
 117     DimensionMismatch((u32, u32)),
 118     ImageError(ImageError)
 119 }
 120
 121 impl Display for CanvasError {
 122     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
 123         write!(f, "Canvas Error: see error_response() for more details")
 124     }
 125 }
 126
 127 impl ResponseError for CanvasError {
 128     fn status_code(&self) -> StatusCode {
 129         match &self {
 130             CanvasError::NotExists => StatusCode::NOT_FOUND,
 131             CanvasError::DimensionMismatch(_) => StatusCode::BAD_REQUEST,
 132             CanvasError::ImageError(e) => e.status_code()
 133         }
 134     }
 135
 136     fn error_response(&self) -> HttpResponse<BoxBody> {
 137         match &self {
 138             CanvasError::NotExists => HttpResponse::NotFound().body("Canvas does not exist."),
 139             CanvasError::DimensionMismatch(dim) =>
 140                 HttpResponse::BadRequest().body(format!("Supplied dimensions don't match the dimensions of existing canvas {:?}.", dim)),
 141             CanvasError::ImageError(e) => e.error_response()
 142         }
 143     }
 144 }
 145
 146 impl From<ImageError> for CanvasError {
 147     fn from(e: ImageError) -> CanvasError {
 148         CanvasError::ImageError(e)
 149     }
 150 }
 151
 152 struct ToRgbIter<'a, T> where T: AsPrimitive<u8> {
 153     iter: &'a mut dyn Iterator<Item = T>
 154 }
 155
 156 impl<'a, T: AsPrimitive<u8>> ToRgbIter<'a, T> {
 157     fn new(iter: &'a mut (dyn Iterator<Item = T>)) -> ToRgbIter<T> {
 158         ToRgbIter { iter }
 159     }
 160 }
 161
 162 impl<T: AsPrimitive<u8> + Zero> Iterator for ToRgbIter<'_, T> {
 163     type Item = Rgb<u8>;
 164     fn next(&mut self) -> Option<Rgb<u8>> {
 165         if let Some(r) = self.iter.next() {
 166             let g = self.iter.next().unwrap_or_else(T::zero);
 167             let b = self.iter.next().unwrap_or_else(T::zero);
 168             Some(Rgb([r.as_(), g.as_(), b.as_()]))
 169         }
 170         else {
 171             None
 172         }
 173     }
 174 }
 175
 176 #[derive(Debug)]
 177 struct Canvas {
 178     pen: usize,
 179     img: RgbImage
 180 }
 181
 182 impl Canvas {
 183     fn new(width: u32, height: u32) -> Canvas {
 184         Canvas { pen: 0, img: ImageBuffer::new(width, height) }
 185     }
 186
 187     /*fn from_image(img: RgbImage) -> Canvas {
 188         Canvas { pen: 0, img }
 189     }
 190
 191     fn replace(&self, img: RgbImage, pen: usize) -> Canvas {
 192         self.img = img;
 193         self.pen = pen;
 194         self
 195     }*/
 196
 197     fn advance_pen(mut self, offset: usize) -> Canvas {
 198         //Canvas { pen: self.pen + offset, img: self.img }
 199         self.pen += offset;
 200         self.pen %= self.img.width() as usize * self.img.height() as usize;
 201         self
 202     }
 203 }
 204
 205 struct Canvas0(Option<Canvas>);
 206 struct Canvas1(Option<Canvas>);
 207 struct Canvas2(Option<Canvas>);
 208
 209 #[get("/hello/{name}")]
 210 async fn greet(name: web::Path<String>, req: HttpRequest) -> impl Responder {
 211     println!("{:?}", req);
 212     format!("Hello {name}!\n{:?}", req.headers().get("user-agent"))
 213 }
 214
 215 fn rgb_encode_with_pen(img: &mut RgbImage, pen: usize, data: &mut dyn Iterator<Item = u8>) -> Result<usize, ImageError> {
 216     let mut pixels = img.pixels_mut().skip(pen);
 217     let mut counter = 0;
 218
 219     for sp in ToRgbIter::new(data) {
 220         let mut dp = match pixels.next() {
 221             Some(pixel) => pixel,
 222             None => {
 223                 pixels = img.pixels_mut().skip(0);
 224                 pixels.next().ok_or_else(ImageError::dimension_error)?
 225             }
 226         };
 227         dp.0 = sp.0;
 228         counter += 1;
 229     }
 230
 231     Ok(counter)
 232 }
 233
 234 fn rgb_encode_to_canvas(mut canvas: Canvas, data: &mut dyn Iterator<Item = u8>) -> Result<Canvas, CanvasError> {
 235     let counter = rgb_encode_with_pen(&mut canvas.img, canvas.pen, data)?;
 236     Ok(canvas.advance_pen(counter))
 237 }
 238
 239 fn rgb_encode(mut img: RgbImage, data: &mut dyn Iterator<Item = u8>) -> Result<RgbImage, ImageError> {
 240     rgb_encode_with_pen(&mut img, 0, data)?;
 241     Ok(img)
 242 }
 243
 244 fn sine_encode(mut img: RgbImage, wave_offset: (u32, u32), amplitude: f32, freq_base: f32, run: u32, wave_color: Rgb<u8>,
 245     data: &mut dyn Iterator<Item = u8>) -> Result<RgbImage, ImageError>
 246 {
 247     let run: f32 = run as f32;
 248     let (wave_offset_x, wave_offset_y) = wave_offset;
 249     let (wave_offset_x, wave_offset_y) = (wave_offset_x as f32, wave_offset_y as f32);
 250     let signal = &mut data.peekable();
 251     let mut x: f32 = wave_offset_x as f32;
 252     let max_x: f32 = (img.width() - 1) as f32;
 253     let max_y: f32 = img.height() as f32;
 254     while signal.peek().is_some() && (x < max_x) {
 255         let px = x;
 256         let s = signal.next().unwrap_or(0);
 257         while ((x - px) < run) && (x < max_x) {
 258             let y = if s != 0 {
 259                 (2.0 * PI * freq_base * x * s as f32).sin() * amplitude + wave_offset_y
 260             }
 261             else { wave_offset_y };
 262             x += 0.001;
 263             if (y > 0.0) && (y < max_y) {
 264                 img.put_pixel(x as u32, y as u32, wave_color);
 265             }
 266         }
 267     }
 268     Ok(img)
 269 }
 270
 271 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>
 272     where F: Fn(Canvas, &mut dyn Iterator<Item = u8>) -> Result<Canvas, CanvasError>
 273 {
 274     let canvas = match canvas_option.take() {
 275         Some(canvas) => match dimensions {
 276             Some(dimensions) => {
 277                 if dimensions == canvas.img.dimensions() {
 278                     Ok(canvas)
 279                 }
 280                 else {
 281                     Err(CanvasError::DimensionMismatch(canvas_option.insert(canvas).img.dimensions()))
 282                 }
 283             },
 284             None =>
 285                 Ok(canvas)
 286         },
 287         None => match dimensions {
 288             Some((dim_x, dim_y)) =>
 289                 Ok(Canvas::new(dim_x, dim_y)),
 290             None =>
 291                 Err(CanvasError::NotExists)
 292         }
 293     }?;
 294
 295     Ok(canvas_option.insert(f(canvas, percent_decode_str(data).into_iter().borrow_mut())?))
 296 }
 297
 298 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>
 299     where F: Fn(RgbImage, &mut dyn Iterator<Item = u8>) -> Result<RgbImage, ImageError>
 300 {
 301     // Image must not be larger than 1 megapixel
 302     if dim_x * dim_y * scale > 1048576 {
 303         return Err(ImageError::dimension_error())
 304     }
 305
 306     let img: RgbImage = encode(ImageBuffer::new(dim_x, dim_y), data)?;
 307     let cursor = image_to_cursor(img, scale)?;
 308     Ok(cursor)
 309 }
 310
 311 fn image_to_cursor(img: RgbImage, scale: u32) -> Result<Cursor<Vec<u8>>, ImageError> {
 312     let (dim_x, dim_y) = img.dimensions();
 313     let (dim_x, dim_y) = (dim_x * scale, dim_y * scale);
 314
 315     // Image must not be larger than 1 megapixel
 316     if dim_x * dim_y > 1048576 {
 317         return Err(ImageError::dimension_error())
 318     }
 319
 320     let mut cursor = Cursor::new(Vec::new());
 321     let img = resize(&img, dim_x, dim_y, FilterType::Nearest);
 322     write_buffer_with_format(&mut cursor, &img, dim_x, dim_y, ColorType::Rgb8, Png)?;
 323     Ok(cursor)
 324 }
 325
 326
 327 #[get("/gen/0/{data}")]
 328 async fn img_gen0(req: HttpRequest) -> Result<impl Responder> {
 329     let data = extract_data!(req, 3);
 330     let cursor = make_png(32, 32, 16, percent_decode_str(data).into_iter().borrow_mut(), rgb_encode)?;
 331     Ok(response_image!(cursor))
 332 }
 333
 334 #[get("/gen/1/{dim_x}/{dim_y}/{scale}/{data}")]
 335 async fn img_gen1(req: HttpRequest, path: web::Path<(u32, u32, u32)>) -> Result<impl Responder> {
 336     let (dim_x, dim_y, scale) = path.into_inner();
 337     let data = extract_data!(req, 6);
 338     let cursor = make_png(dim_x, dim_y, scale, percent_decode_str(data).into_iter().borrow_mut(), rgb_encode)?;
 339     Ok(response_image!(cursor))
 340 }
 341
 342 #[get("/gen/2/{dim_x}/{dim_y}/{scale}")]
 343 async fn img_gen2(req: HttpRequest, path: web::Path<(u32, u32, u32)>) -> Result<impl Responder> {
 344     let (dim_x, dim_y, scale) = path.into_inner();
 345     let data = extract_header!(req, "user-agent");
 346     let cursor = make_png(dim_x, dim_y, scale, &mut data.bytes(), rgb_encode)?;
 347     Ok(response_image!(cursor))
 348 }
 349
 350 #[get("/gen/3/{scale}")]
 351 async fn img_gen3(req: HttpRequest, path: web::Path<u32>) -> Result<impl Responder> {
 352     let scale = path.into_inner();
 353     let data = extract_header!(req, "user-agent");
 354     let rgbimg: RgbImage = rgb_encode(ImageBuffer::new(TIMEAVATAR_SIZE_U32, TIMEAVATAR_SIZE_U32), &mut data.bytes())?;
 355     let mut resimg: RgbImage = ImageBuffer::new(60 * TIMEAVATAR_SIZE_U32, 24 * TIMEAVATAR_SIZE_U32);
 356     let time = OffsetDateTime::now_utc().time();
 357     let (hour, minute): (i64, i64) = (time.hour().into(), time.minute().into());
 358     overlay(&mut resimg, &rgbimg, minute * TIMEAVATAR_SIZE_I64, hour * TIMEAVATAR_SIZE_I64);
 359     let cursor = image_to_cursor(resimg, scale)?;
 360     Ok(response_image!(cursor))
 361 }
 362
 363 #[get("/gen/4/{dim_x}/{dim_y}/{scale}/{wave_offset_x}/{wave_offset_y}/{amplitude}/{freq}/{run}/{wave_color}/{data}")]
 364 #[allow(clippy::type_complexity)]
 365 async fn img_gen4(req: HttpRequest, path: web::Path<(u32, u32, u32, u32, u32, f32, f32, u32)>) -> Result<impl Responder> {
 366     let (dim_x, dim_y, scale, wave_offset_x, wave_offset_y, amplitude, freq_base, run) = path.into_inner();
 367     let freq_base = freq_base / 1000.0;
 368     let wave_color = extract_color!(req, 11)?;
 369     let signal = &mut percent_decode_str(extract_data!(req, 12));
 370     let cursor = make_png(dim_x, dim_y, scale, signal,
 371         |img, signal| sine_encode(img, (wave_offset_x, wave_offset_y), amplitude, freq_base, run, wave_color, signal))?;
 372     Ok(response_image!(cursor))
 373 }
 374
 375 #[get("/pgen/0/{data}")]
 376 async fn img_pgen0(req: HttpRequest, canvas0: web::Data<Arc<Mutex<Canvas0>>>) -> Result<impl Responder> {
 377     let data = extract_data!(req, 3);
 378     let scale = 16;
 379     let img: RgbImage = ({
 380         let canvas_option = &mut *canvas0.lock().unwrap();
 381         Ok(apply_to_canvas( |c, d| rgb_encode_to_canvas(c, d), &mut canvas_option.0, None, data)?.img.clone())
 382     } as Result<RgbImage, CanvasError>)?;
 383     let cursor = image_to_cursor(img, scale)?;
 384     Ok(response_image!(cursor))
 385 }
 386
 387 #[get("/pgen/1/{dim_x}/{dim_y}/{scale}/{data}")]
 388 async fn img_pgen1(req: HttpRequest, path: web::Path<(u32, u32, u32)>, canvas1: web::Data<Arc<Mutex<Canvas1>>>) -> Result<impl Responder> {
 389     let (dim_x, dim_y, scale) = path.into_inner();
 390     let data = extract_data!(req, 6);
 391     let img: RgbImage = ({
 392         let canvas_option = &mut *canvas1.lock().unwrap();
 393         Ok(apply_to_canvas( |c, d| rgb_encode_to_canvas(c, d), &mut canvas_option.0, Some((dim_x, dim_y)), data)?.img.clone())
 394     } as Result<RgbImage, CanvasError>)?;
 395     let cursor = image_to_cursor(img, scale)?;
 396     Ok(response_image!(cursor))
 397 }
 398
 399 #[get("/pgen/2/{dim_x}/{dim_y}/{scale}")]
 400 async fn img_pgen2(req: HttpRequest, path: web::Path<(u32, u32, u32)>, canvas1: web::Data<Arc<Mutex<Canvas1>>>) -> Result<impl Responder> {
 401     let (dim_x, dim_y, scale) = path.into_inner();
 402     let data = extract_header!(req, "user-agent");
 403     let img: RgbImage = ({
 404         let canvas_option = &mut *canvas1.lock().unwrap();
 405         Ok(apply_to_canvas( |c, d| rgb_encode_to_canvas(c, d), &mut canvas_option.0, Some((dim_x, dim_y)), data)?.img.clone())
 406     } as Result<RgbImage, CanvasError>)?;
 407     let cursor = image_to_cursor(img, scale)?;
 408     Ok(response_image!(cursor))
 409 }
 410
 411 #[get("/pgen/3/{scale}")]
 412 async fn img_pgen3(req: HttpRequest, path: web::Path<u32>, canvas2: web::Data<Arc<Mutex<Canvas2>>>) -> Result<impl Responder> {
 413     let scale = path.into_inner();
 414     let data = extract_header!(req, "user-agent");
 415     let time = OffsetDateTime::now_utc().time();
 416     let (hour, minute): (i64, i64) = (time.hour().into(), time.minute().into());
 417     let rgbimg: RgbImage = rgb_encode(ImageBuffer::new(TIMEAVATAR_SIZE_U32, TIMEAVATAR_SIZE_U32), &mut data.bytes())?;
 418     let resimg: RgbImage = ({
 419         let canvas_option = &mut *canvas2.lock().unwrap();
 420         let mut canvas = match canvas_option.0.take() {
 421             Some(canvas) => canvas,
 422             None => Canvas::new(60 * TIMEAVATAR_SIZE_U32, 24 * TIMEAVATAR_SIZE_U32)
 423         };
 424         overlay(&mut canvas.img, &rgbimg, minute * TIMEAVATAR_SIZE_I64, hour * TIMEAVATAR_SIZE_I64);
 425         Ok(canvas_option.0.insert(canvas).img.clone())
 426     } as Result<RgbImage, CanvasError>)?;
 427     let cursor = image_to_cursor(resimg, scale)?;
 428     Ok(response_image!(cursor))
 429 }
 430
 431 #[get("/pdrop/{canvas_id}")]
 432 async fn pdrop(canvas_id: web::Path<u8>,
 433     canvas0: web::Data<Arc<Mutex<Canvas0>>>,
 434     canvas1: web::Data<Arc<Mutex<Canvas1>>>,
 435     canvas2: web::Data<Arc<Mutex<Canvas2>>>) -> Result<impl Responder> {
 436
 437     let canvas_id = canvas_id.into_inner();
 438     match canvas_id {
 439         0 => canvas0.lock().unwrap().0.take(),
 440         1 => canvas1.lock().unwrap().0.take(),
 441         2 => canvas2.lock().unwrap().0.take(),
 442         _ => None
 443     }.ok_or(CanvasError::NotExists)?;
 444     Ok(HttpResponse::build(StatusCode::OK)
 445        .body(format!("Canvas {} dropped.", canvas_id)))
 446 }
 447
 448
 449 #[actix_web::main] // or #[tokio::main]
 450 async fn main() -> std::io::Result<()> {
 451     env_logger::builder()
 452         .filter_module("actix_web", LevelFilter::Info)
 453         .parse_default_env()
 454         .init();
 455
 456     let listenaddress = env::args().nth(1).unwrap_or_else(|| "127.0.0.1:8080".to_string());
 457     let canvas0 = Arc::new(Mutex::new(Canvas0(Some(Canvas::new(32, 32)))));
 458     let canvas1 = Arc::new(Mutex::new(Canvas1(None)));
 459     let canvas2 = Arc::new(Mutex::new(Canvas2(None)));
 460
 461     HttpServer::new(move || {
 462         App::new()
 463             .wrap(Logger::default())
 464             .service(greet)
 465             .service(img_gen0)
 466             .service(img_gen1)
 467             .service(img_gen2)
 468             .service(img_gen3)
 469             .service(img_gen4)
 470             .service(img_pgen0)
 471             .service(img_pgen1)
 472             .service(img_pgen2)
 473             .service(img_pgen3)
 474             .service(pdrop)
 475             .app_data(web::Data::new(canvas0.clone()))
 476             .app_data(web::Data::new(canvas1.clone()))
 477             .app_data(web::Data::new(canvas2.clone()))
 478     })
 479     .bind(listenaddress)?
 480     .run()
 481     .await
 482 }