src/main.rs

   1 use std::io::Cursor;
   2 use std::fmt::Display;
   3 use std::fmt;
   4 use std::borrow::BorrowMut;
   5 use num_traits::Zero;
   6 use num_traits::cast::AsPrimitive;
   7 use percent_encoding::percent_decode_str;
   8 use actix_web::{get, web, App, HttpServer, HttpRequest, HttpResponse, Responder, ResponseError, Result};
   9 use actix_web::body::BoxBody;
  10 use actix_web::http::StatusCode;
  11 use image::{ImageBuffer, ColorType, Rgb, RgbImage, write_buffer_with_format};
  12 use image::ImageOutputFormat::Png;
  13 use image::imageops::{FilterType, resize};
  14
  15
  16 #[derive(Debug)]
  17 struct ImageError(image::ImageError);
  18
  19 impl Display for ImageError {
  20     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
  21         write!(f, "{}", &self.0)
  22     }
  23 }
  24
  25 impl ResponseError for ImageError {
  26     fn status_code(&self) -> StatusCode {
  27         StatusCode::INTERNAL_SERVER_ERROR
  28     }
  29
  30     fn error_response(&self) -> HttpResponse<BoxBody> {
  31         HttpResponse::InternalServerError().finish()
  32     }
  33 }
  34
  35 struct ToRgbIter<'a, T> where T: AsPrimitive<u8> {
  36     iter: Box<&'a mut dyn Iterator<Item = T>>
  37 }
  38
  39 impl<'a, T: AsPrimitive<u8>> ToRgbIter<'a, T> {
  40     fn new(data: &'a mut (dyn Iterator<Item = T>)) -> ToRgbIter<T> {
  41         ToRgbIter { iter: Box::new(data) }
  42     }
  43 }
  44
  45 impl<T: AsPrimitive<u8> + Zero> Iterator for ToRgbIter<'_, T> {
  46     type Item = Rgb<u8>;
  47     fn next(&mut self) -> Option<Rgb<u8>> {
  48         if let Some(r) = self.iter.next() {
  49             let g = self.iter.next().unwrap_or(T::zero());
  50             let b = self.iter.next().unwrap_or(T::zero());
  51             println!("{} {} {}", r.as_(), g.as_(), b.as_());
  52             //Some(Rgb([r.unwrap_or(0) as u8, g.unwrap_or(0) as u8, b.unwrap_or(0) as u8]))
  53             Some(Rgb([r.as_(), g.as_(), b.as_()]))
  54         }
  55         else {
  56             None
  57         }
  58     }
  59 }
  60
  61 fn to_imageresult<T> (result: Result<T, image::ImageError>) -> Result<T, ImageError> {
  62     match result {
  63         Ok(v) => Ok(v),
  64         Err(e) => Err(ImageError(e))
  65     }
  66 }
  67
  68 #[get("/hello/{name}")]
  69 async fn greet(name: web::Path<String>, req: HttpRequest) -> impl Responder {
  70     println!("{:?}", req);
  71     format!("Hello {name}!")
  72 }
  73
  74 #[get("/gen/{data}")]
  75 async fn img_gen(req: HttpRequest) -> Result<impl Responder> {
  76     let mut cursor = Cursor::new(Vec::new());
  77     let mut img: RgbImage = ImageBuffer::new(32, 32);
  78     let mut pixels = img.pixels_mut();
  79     let data = req.uri().path().split("/").skip(2).next().unwrap();
  80
  81     //println!("{:#?}\n{:#?}", req.uri().path().split("/").skip(2).next(), req.match_info().get("data"));
  82
  83     println!("{:?}", data);
  84     //for sp in ToRgbIter::new(percent_decode(&RawOsString::from_string(data.into_inner()).as_raw_bytes()).into_iter().borrow_mut()) {
  85     for sp in ToRgbIter::new(percent_decode_str(&data).into_iter().borrow_mut()) {
  86         let mut dp = pixels.next().unwrap();
  87         println!("{:?}", sp);
  88         dp.0 = sp.0;
  89     }
  90
  91     let img = resize(&img, 512, 512, FilterType::Nearest);
  92     println!("Here!");
  93     to_imageresult(write_buffer_with_format(&mut cursor, &img, 512, 512, ColorType::Rgb8, Png))?;
  94     Ok(HttpResponse::build(StatusCode::OK)
  95        .content_type("image/png")
  96        .body(cursor.into_inner()))
  97 }
  98
  99 #[actix_web::main] // or #[tokio::main]
 100 async fn main() -> std::io::Result<()> {
 101     HttpServer::new(|| {
 102         App::new().service(greet).service(img_gen)
 103     })
 104     .bind(("127.0.0.1", 8080))?
 105     .run()
 106     .await
 107 }