feat: render to png + edits

src/main.rs

@@ -1,8 +1,13 @@
-use std::{ffi::OsString, fs, net::TcpListener, process};
+use std::{net::TcpListener, process, rc::Rc};
 
 use ctrlc;
 use http::responses::{Body, Response};
 
+use resvg::{
+    tiny_skia::{Color, Pixmap, Transform},
+    usvg,
+};
+
 mod handlers;
 mod http;
 mod icons;
@@ -19,10 +24,10 @@ fn main() {
     })
     .unwrap_or_else(|_| fatal("Failed to set termination signal handler"));
 
-    let icons = match icons::Icons::build() {
+    let icons_rc = Rc::new(match icons::Icons::build() {
         Ok(icons) => icons,
         Err(e) => fatal(e),
-    };
+    });
 
     let mut handlers = handlers::Handlers::new();
 
@@ -34,28 +39,123 @@ fn main() {
         Response::new(req, 200, Body::Static("OK - luciders is running"))
     });
 
-    handlers.add_handler("/icons/[icon].svg", move |req| {
-        if req.method != "GET" {
-            return Response::new(req, 405, Body::Static("Method Not Allowed"));
+    handlers.add_handler("/icons/[icon].svg", {
+        let icons = Rc::clone(&icons_rc);
+        move |req| {
+            if req.method != "GET" {
+                return Response::new(req, 405, Body::Static("Method Not Allowed"));
+            }
+
+            let icon_filename = match req.url.get_path_segment(1) {
+                Some(icon) => icon,
+                None => return Response::new(req, 404, Body::Static("Icon Segment Not Found")),
+            };
+
+            let icon_name = &icon_filename[..icon_filename.len() - icons::ICON_FILE_EXTENSION_LEN];
+
+            if !icons.has_iconname(icon_name) {
+                return Response::new(req, 404, Body::Static("Icon Not Found"));
+            }
+
+            let icon = match icons.get_icon(icon_name) {
+                Some(icon) => icon,
+                None => return Response::new(req, 500, Body::Static("Failed to read icon")),
+            };
+
+            return Response::new(req, 200, Body::Bytes(icon, "image/svg+xml"));
         }
+    });
 
-        let icon_filename = match req.url.get_path_segment(1) {
-            Some(icon) => icon,
-            None => return Response::new(req, 404, Body::Static("Icon Not Found")),
-        };
+    handlers.add_handler("/icons/[icon].png", {
+        let icons = Rc::clone(&icons_rc);
+        move |req| {
+            if req.method != "GET" {
+                return Response::new(req, 405, Body::Static("Method Not Allowed"));
+            }
 
-        let icon_name = &icon_filename[..icon_filename.len() - icons::ICON_FILE_EXTENSION_LEN];
+            let icon_filename = match req.url.get_path_segment(1) {
+                Some(icon) => icon,
+                None => return Response::new(req, 404, Body::Static("Icon Segment Not Found")),
+            };
 
-        if !icons.has_iconname(icon_name) {
-            return Response::new(req, 404, Body::Static("Icon Not Found"));
+            let icon_name = &icon_filename[..icon_filename.len() - icons::ICON_FILE_EXTENSION_LEN];
+
+            if !icons.has_iconname(icon_name) {
+                return Response::new(req, 404, Body::Static("Icon Not Found"));
+            }
+
+            let icon = match icons.get_icon(icon_name) {
+                Some(icon) => icon,
+                None => return Response::new(req, 500, Body::Static("Failed to read icon")),
+            };
+
+            let tree = match usvg::Tree::from_data(&icon, &usvg::Options::default()) {
+                Ok(tree) => tree,
+                Err(_) => {
+                    return Response::new(req, 500, Body::Static("Failed to load icon into tree"))
+                }
+            };
+
+            // Options handling
+            let mut scale = 1;
+            match req.url.query.get("scale") {
+                Some(scale_str) => {
+                    match scale_str.parse::<u32>() {
+                        Ok(scale_val) => {
+                            if scale_val <= 0 || scale_val > 100 {
+                                return Response::new(req, 400, Body::Static("Invalid scale value. Scale value must be an integer > 0 and <= 100"));
+                            }
+                            scale = scale_val;
+                        }
+                        Err(_) => {
+                            return Response::new(req, 400, Body::Static("Invalid scale value. Scale value must be an integer > 0 and <= 100"));
+                        }
+                    }
+                }
+                None => {}
+            }
+
+            let mut padding = 0;
+            match req.url.query.get("padding") {
+                Some(padding_str) => {
+                    match padding_str.parse::<u32>() {
+                        Ok(padding_val) => {
+                            if padding_val > 100 {
+                                return Response::new(req, 400, Body::Static("Invalid padding value. Padding value must be an integer >= 0 and <= 100"));
+                            }
+
+                            padding = padding_val;
+                        }
+                        Err(_) => {
+                            return Response::new(req, 400, Body::Static("Invalid padding value. Padding value must be an integer >= 0 and <= 100"));
+                        }
+                    }
+                }
+                None => {}
+            }
+
+            let length = 24 * scale + padding;
+
+            let mut pixmap = match Pixmap::new(length, length) {
+                Some(pixmap) => pixmap,
+                None => return Response::new(req, 500, Body::Static("Failed to create pixmap")),
+            };
+
+            let mut pixmap_mut = pixmap.as_mut();
+
+            resvg::render(
+                &tree,
+                    Transform::from_scale(scale as f32, scale as f32)
+                    .post_concat(Transform::from_translate(length as f32 / 2.0 - 12.0 * scale as f32, length as f32 / 2.0 - 12.0 * scale as f32)),
+                &mut pixmap_mut,
+            );
+            let png = match pixmap.encode_png() {
+                Ok(png) => png,
+                Err(_) => return Response::new(req, 500, Body::Static("Failed to encode PNG")),
+            };
+
+            return Response::new(req, 200, Body::Bytes(png, "image/png"));
         }
-
-        let icon = match icons.get_icon(icon_name) {
-            Some(icon) => icon,
-            None => return Response::new(req, 500, Body::Static("Failed to read icon")),
-        };
-
-        return Response::new(req, 200, Body::Bytes(icon, "image/svg+xml"));
     });
 
     handlers.bind(listener);