Allow downloading images by passing download=true query param

src/ext/kemal.cr

@@ -45,7 +45,7 @@ end
 
 private MAGICKLOAD_EXTENSIONS = %w(.arw .cin .cr2 .crw .nef .orf .raf .x3f)
 
-def send_file_as_jpeg(env, file : GPhoto2::CameraFile, width : Int? = nil, height : Int? = nil, disposition = "inline")
+def send_file_as_jpeg(env, file : GPhoto2::CameraFile, width : Int? = nil, height : Int? = nil, disposition = nil)
   file_path = Path[file.path]
 
   if file_path.extension.downcase.in?(MAGICKLOAD_EXTENSIONS)
@@ -70,6 +70,8 @@ def send_file_as_jpeg(env, file : GPhoto2::CameraFile, width : Int? = nil, heigh
       end
     end
 
+    disposition ||= "inline"
+
     send_file env, image.jpegsave_buffer(strip: true),
       mime_type: "image/jpeg",
       filename: "#{file_path.stem}.jpg",

src/gphoto2/web/routes.cr

@@ -136,6 +136,9 @@ get "/cameras/:id/blob/*filepath" do |env|
   width = env.params.query["width"]?.try(&.to_i)
   height = env.params.query["height"]?.try(&.to_i)
 
+  download = env.params.query["download"]? == "true"
+  disposition = "attachment" if download
+
   GPhoto2::Web.camera_by_id(id) do |camera|
     fs = camera / path.dirname
     file = fs.open(path.basename)
@@ -146,9 +149,11 @@ get "/cameras/:id/blob/*filepath" do |env|
       if as_jpeg || width
         send_file_as_jpeg env, file,
           width: width,
-          height: height
+          height: height,
+          disposition: disposition
       else
-        send_file env, file
+        send_file env, file,
+          disposition: disposition
       end
     end
   end