universe@289: import jakarta.servlet.FilterChain
universe@289: import jakarta.servlet.annotation.WebFilter
universe@289: import jakarta.servlet.http.HttpFilter
universe@289: import jakarta.servlet.http.HttpServletRequest
universe@289: import jakarta.servlet.http.HttpServletResponse
universe@289: 
universe@289: /*
universe@289:  * Copyright 2023 Mike Becker. All rights reserved.
universe@289:  *
universe@289:  * Redistribution and use in source and binary forms, with or without
universe@289:  * modification, are permitted provided that the following conditions are met:
universe@289:  *
universe@289:  * 1. Redistributions of source code must retain the above copyright
universe@289:  * notice, this list of conditions and the following disclaimer.
universe@289:  *
universe@289:  * 2. Redistributions in binary form must reproduce the above copyright
universe@289:  * notice, this list of conditions and the following disclaimer in the
universe@289:  * documentation and/or other materials provided with the distribution.
universe@289:  *
universe@289:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
universe@289:  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
universe@289:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
universe@289:  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
universe@289:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
universe@289:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
universe@289:  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
universe@289:  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
universe@289:  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
universe@289:  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
universe@289:  */
universe@289: 
universe@289: @WebFilter(urlPatterns = ["*.ttf", "*.css", "*.js"])
universe@289: class StaticFilesFilter : HttpFilter() {
universe@289:     override fun doFilter(req: HttpServletRequest, res: HttpServletResponse, chain: FilterChain) {
universe@289:         // Apply a Cache-Control Header for static files to allow storing them
universe@289:         // in shared cache for almost indefinitely. We will cache-bust them when we need an update.
universe@289:         // RFC-2616 mandates that servers SHOULD NOT specify more than one year, though
universe@289:         res.addHeader("Cache-Control", "public, max-age=31536000, immutable")
universe@289:         super.doFilter(req, res, chain)
universe@289:     }
universe@289: }