1 use std
::convert
::From
;
5 use std
::borrow
::BorrowMut
;
6 use std
::sync
::{Arc
, Mutex
};
8 use num_traits
::cast
::AsPrimitive
;
9 use percent_encoding
::percent_decode_str
;
10 use actix_web
::{get
, web
, App
, HttpServer
, HttpRequest
, HttpResponse
, Responder
, ResponseError
, Result
};
11 use actix_web
::body
::BoxBody
;
12 use actix_web
::http
::StatusCode
;
13 use image
::{ImageBuffer
, ColorType
, Rgb
, RgbImage
, write_buffer_with_format
};
14 use image
::ImageOutputFormat
::Png
;
15 use image
::imageops
::{FilterType
, resize
};
16 use image
::error
::{LimitError
, LimitErrorKind
};
20 struct ImageError(image
::ImageError
);
23 fn dimension_error() -> ImageError
{
24 ImageError(image
::ImageError
::Limits(LimitError
::from_kind(LimitErrorKind
::DimensionError
)))
28 impl Display
for ImageError
{
29 fn fmt(&self, f
: &mut fmt
::Formatter
<'_
>) -> fmt
::Result
{
30 write
!(f
, "{}", &self.0)
34 impl ResponseError
for ImageError
{
35 fn status_code(&self) -> StatusCode
{
36 StatusCode
::INTERNAL_SERVER_ERROR
39 fn error_response(&self) -> HttpResponse
<BoxBody
> {
40 HttpResponse
::InternalServerError().body(format
!("{}\n", &self))
47 DimensionMismatch((u32, u32)),
48 ImageError(ImageError
)
51 impl Display
for CanvasError
{
52 fn fmt(&self, f
: &mut fmt
::Formatter
<'_
>) -> fmt
::Result
{
53 write
!(f
, "Canvas Error: see error_response() for more details")
57 impl ResponseError
for CanvasError
{
58 fn status_code(&self) -> StatusCode
{
60 CanvasError
::NotExists
=> StatusCode
::NOT_FOUND
,
61 CanvasError
::DimensionMismatch(_
) => StatusCode
::BAD_REQUEST
,
62 CanvasError
::ImageError(e
) => e
.status_code()
66 fn error_response(&self) -> HttpResponse
<BoxBody
> {
68 CanvasError
::NotExists
=> HttpResponse
::NotFound().body("Canvas does not exist."),
69 CanvasError
::DimensionMismatch(dim
) =>
70 HttpResponse
::BadRequest().body(format
!("Supplied dimensions don't match the dimensions of existing canvas {:?}.", dim
)),
71 CanvasError
::ImageError(e
) => e
.error_response()
76 impl From
<ImageError
> for CanvasError
{
77 fn from(e
: ImageError
) -> CanvasError
{
78 CanvasError
::ImageError(e
)
82 struct ToRgbIter
<'a
, T
> where T
: AsPrimitive
<u8> {
83 iter
: Box
<&'a
mut dyn Iterator
<Item
= T
>>
86 impl<'a
, T
: AsPrimitive
<u8>> ToRgbIter
<'a
, T
> {
87 fn new(data
: &'a
mut (dyn Iterator
<Item
= T
>)) -> ToRgbIter
<T
> {
88 ToRgbIter
{ iter
: Box
::new(data
) }
92 impl<T
: AsPrimitive
<u8> + Zero
> Iterator
for ToRgbIter
<'_
, T
> {
94 fn next(&mut self) -> Option
<Rgb
<u8>> {
95 if let Some(r
) = self.iter
.next() {
96 let g
= self.iter
.next().unwrap
_or
(T
::zero());
97 let b
= self.iter
.next().unwrap
_or
(T
::zero());
98 Some(Rgb([r
.as_(), g
.as_(), b
.as_()]))
106 fn to_imageresult
<T
> (result
: Result
<T
, image
::ImageError
>) -> Result
<T
, ImageError
> {
109 Err(e
) => Err(ImageError(e
))
113 fn to_canvasresult
<T
: std
::fmt
::Debug
> (result
: Result
<T
, ImageError
>) -> Result
<T
, CanvasError
> {
116 Err(e
) => Err(CanvasError
::ImageError(e
))
127 fn new(width
: u32, height
: u32) -> Canvas
{
128 Canvas
{ pen
: 0, img
: ImageBuffer
::new(width
, height
) }
131 fn from_image(img
: RgbImage
) -> Canvas
{
132 Canvas
{ pen
: 0, img
}
135 /*fn replace(&self, img: RgbImage, pen: usize) -> Canvas {
141 fn advance_pen(mut self, offset
: usize) -> Canvas
{
142 //Canvas { pen: self.pen + offset, img: self.img }
144 self.pen
%= self.img
.width() as usize * self.img
.height() as usize;
149 struct Canvas0(Option
<Canvas
>);
150 struct Canvas1(Option
<Canvas
>);
152 #[get("/hello/{name}")]
153 async
fn greet(name
: web
::Path
<String
>, req
: HttpRequest
) -> impl Responder
{
154 println
!("{:?}", req
);
155 format
!("Hello {name}!")
158 fn rgb_encode_to_canvas(mut canvas
: Canvas
, data
: &mut dyn Iterator
<Item
= u8>) -> Result
<Canvas
, ImageError
> {
159 let mut pixels
= canvas
.img
.pixels_mut().skip(canvas
.pen
);
162 for sp
in ToRgbIter
::new(data
) {
163 let mut dp
= match pixels
.next() {
164 Some(pixel
) => pixel
,
166 pixels
= canvas
.img
.pixels_mut().skip(0);
167 pixels
.next().ok_or(ImageError
::dimension_error())?
174 Ok(canvas
.advance_pen(counter
))
177 fn rgb_encode(img
: RgbImage
, data
: &mut dyn Iterator
<Item
= u8>) -> Result
<RgbImage
, ImageError
> {
178 Ok(rgb_encode_to_canvas(Canvas
::from_image(img
), data
)?
.img
)
181 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
>
182 where F
: Fn(Canvas
, &mut dyn Iterator
<Item
= u8>) -> Result
<Canvas
, CanvasError
>
184 let canvas
= match canvas_option
.take() {
185 Some(canvas
) => match dimensions
{
186 Some(dimensions
) => {
187 if dimensions
== canvas
.img
.dimensions() {
191 Err(CanvasError
::DimensionMismatch(canvas_option
.insert
(canvas
).img
.dimensions()))
197 None
=> match dimensions
{
198 Some((dim_x
, dim_y
)) =>
199 Ok(Canvas
::new(dim_x
, dim_y
)),
201 Err(CanvasError
::NotExists
)
205 Ok(canvas_option
.insert
(f(canvas
, percent_decode_str(&data
).into
_iter
().borrow_mut())?
))
208 fn make_png(dim_x
: u32, dim_y
: u32, scale
: u32, data
: &mut dyn Iterator
<Item
= u8>) -> Result
<Cursor
<Vec
<u8>>, ImageError
> {
209 // Image must not be larger than 1 megapixel
210 if dim_x
* dim_y
* scale
> 1048576 {
211 return Err(ImageError
::dimension_error())
214 let img
: RgbImage
= rgb_encode(ImageBuffer
::new(dim_x
, dim_y
), data
)?
;
216 let tdim_x
= dim_x
* scale
;
217 let tdim_y
= dim_y
* scale
;
218 let img
= resize(&img
, tdim_x
, tdim_y
, FilterType
::Nearest
);
219 let mut cursor
= Cursor
::new(Vec
::new());
220 to_imageresult(write_buffer_with_format(&mut cursor
, &img
, tdim_x
, tdim_y
, ColorType
::Rgb8
, Png
))?
;
224 fn image_to_cursor(img
: RgbImage
, scale
: u32) -> Result
<Cursor
<Vec
<u8>>, ImageError
> {
225 let (dim_x
, dim_y
) = img
.dimensions();
226 let (dim_x
, dim_y
) = (dim_x
* scale
, dim_y
* scale
);
228 // Image must not be larger than 1 megapixel
229 if dim_x
* dim_y
> 1048576 {
230 return Err(ImageError
::dimension_error())
233 let mut cursor
= Cursor
::new(Vec
::new());
234 let img
= resize(&img
, dim_x
, dim_y
, FilterType
::Nearest
);
235 to_imageresult(write_buffer_with_format(&mut cursor
, &img
, dim_x
, dim_y
, ColorType
::Rgb8
, Png
))?
;
240 #[get("/gen/0/{data}")]
241 async
fn img_gen0(req
: HttpRequest
) -> Result
<impl Responder
> {
242 let data
= req
.ur
i().path().split("/").skip(3).next().unwrap
();
243 let cursor
= make_png(32, 32, 16, percent_decode_str(&data
).into
_iter
().borrow_mut())?
;
244 Ok(HttpResponse
::build(StatusCode
::OK
)
245 .content_type("image/png")
246 .body(cursor
.into
_inner
()))
249 #[get("/gen/1/{dim_x}/{dim_y}/{scale}/{data}")]
250 async
fn img_gen1(req
: HttpRequest
, path
: web
::Path
<(u32, u32, u32)>) -> Result
<impl Responder
> {
251 let (dim_x
, dim_y
, scale
) = path
.into
_inner
();
252 let data
= req
.ur
i().path().split("/").skip(6).next().unwrap
();
253 let cursor
= make_png(dim_x
, dim_y
, scale
, percent_decode_str(&data
).into
_iter
().borrow_mut())?
;
254 Ok(HttpResponse
::build(StatusCode
::OK
)
255 .content_type("image/png")
256 .body(cursor
.into
_inner
()))
259 #[get("/pgen/0/{data}")]
260 async
fn img_pgen0(req
: HttpRequest
, canvas0
: web
::Data
<Arc
<Mutex
<Canvas0
>>>) -> Result
<impl Responder
> {
261 let data
= req
.ur
i().path().split("/").skip(3).next().unwrap
();
263 let img
: RgbImage
= ({
264 let canvas_option
= &mut *canvas0
.lock().unwrap
();
265 Ok(apply_to_canvas( |c
, d
| to_canvasresult(rgb_encode_to_canvas(c
, d
)), &mut canvas_option
.0, None
, data
)?
.img
.clone())
266 } as Result
<RgbImage
, CanvasError
>)?
;
267 let cursor
= image_to_cursor(img
, scale
)?
;
268 Ok(HttpResponse
::build(StatusCode
::OK
)
269 .content_type("image/png")
270 .body(cursor
.into
_inner
()))
273 #[get("/pgen/1/{dim_x}/{dim_y}/{scale}/{data}")]
274 async
fn img_pgen1(req
: HttpRequest
, path
: web
::Path
<(u32, u32, u32)>, canvas1
: web
::Data
<Arc
<Mutex
<Canvas1
>>>) -> Result
<impl Responder
> {
275 let (dim_x
, dim_y
, scale
) = path
.into
_inner
();
276 let data
= req
.ur
i().path().split("/").skip(6).next().unwrap
();
277 let img
: RgbImage
= ({
278 let canvas_option
= &mut *canvas1
.lock().unwrap
();
279 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())
280 } as Result
<RgbImage
, CanvasError
>)?
;
281 let cursor
= image_to_cursor(img
, scale
)?
;
282 Ok(HttpResponse
::build(StatusCode
::OK
)
283 .content_type("image/png")
284 .body(cursor
.into
_inner
()))
288 #[actix_web::main] // or #[tokio::main]
289 async
fn main() -> std
::io
::Result
<()> {
291 let canvas0
= Arc
::new(Mutex
::new(Canvas0(Some(Canvas
::new(32, 32)))));
292 let canvas1
= Arc
::new(Mutex
::new(Canvas1(None
)));
293 HttpServer
::new(move || {
300 .app_data(web
::Data
::new(canvas0
.clone()))
301 .app_data(web
::Data
::new(canvas1
.clone()))
303 .bind(("127.0.0.1", 8080))?