src/main.rs

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