routes/upload: figure out how to serve images

However, browsers prompt for download since they're not coming down
with a relevant mimetype (they have application/octet-stream).

See: crystal-lang/crystal#5765

.gitignore

@@ -1,3 +1,3 @@
 /main
 /main.dwarf
-/data/
+/i/

main.cr

@@ -5,7 +5,7 @@ require "./routes/ping"
 require "./routes/upload"
 
 # Create data directory if it doesn't exist
-DATA_DIR="./data"
+DATA_DIR="./i/"
 Dir.mkdir_p(DATA_DIR)
 
 # Start http server
@@ -16,7 +16,10 @@ HTTP::Server.new("0.0.0.0", 8080, [
                    PingHandler.new,
                    IndexHandler.new,
                    UploadHandler.new(DATA_DIR),
-                   # Static assetsn
-                   HTTP::StaticFileHandler.new("./html/", directory_listing=false),
-                   HTTP::ErrorHandler.new,
+                   # Serve images
+                   HTTP::StaticFileHandler.new("./i", directory_listing=false),
+                   # Static assets
+                   HTTP::StaticFileHandler.new("./html", directory_listing=false),
+                   # Final error page
+                   HTTP::ErrorHandler.new, # TODO(adam): what does this do?
                  ]).listen

routes/index.cr

@@ -7,6 +7,9 @@ class IndexHandler
     if ctx.request.path == "/"
       ctx.request.path = "/index.html"
     end
+    if ctx.request.path.starts_with?("/i/")
+      ctx.request.path = ctx.request.path.gsub("/i/", "")
+    end
     call_next(ctx)
   end
 end

routes/upload.cr

@@ -13,8 +13,6 @@ class UploadHandler
 
   def call(ctx)
     if ctx.request.method == "POST" && ctx.request.path == "/upload"
-      puts "#{ctx.request.method}"
-
       # TODO(adam): Check content-length
 
       HTTP::FormData.parse(ctx.request) do |part|
@@ -33,14 +31,15 @@ class UploadHandler
           # Generate new path
           checksum = hasher.hexdigest[0, 16]
           ext = File.extname(File.basename(part.filename || "ukn")) # TODO(adam): detect content type
-          path = File.join([@data_dir, "#{checksum}#{ext}"])
+          name = "#{checksum}#{ext}"
+          path = File.join([@data_dir, name])
 
           # Move uploaded file
           File.rename(file.path, path) unless File.exists?(path)
 
           # Set response
-          ctx.response.status_code = 200
-          ctx.response.print "uploaded #{File.size(path)} bytes"
+          ctx.response.status_code = 302
+          ctx.response.headers.add("Location", "/i/#{name}")
 
           return # quit early after successful upload
         end