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