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Implement ETags

This commit is contained in:
blankie 2023-05-12 16:56:22 +07:00
parent 9259f7c198
commit b277d0274c
Signed by: blankie
GPG Key ID: CC15FC822C7F61F5
5 changed files with 129 additions and 8 deletions
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24
routes/css.cpp
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@ -1,8 +1,10 @@
#include <string>
#include <FastHash.h>
#include "routes.h"
#include "../servehelper.h"
void css_route(const httplib::Request& req, httplib::Response& res) {
res.set_content(R"EOF(
#define CSS R"EOF(
/* GENERAL */
:root {
--background-color: black;
@ -127,6 +129,20 @@ void css_route(const httplib::Request& req, httplib::Response& res) {
border-style: solid;
border-color: var(--error-border-color);
}
)EOF"
#define CSS_LEN sizeof(CSS) / sizeof(CSS[0]) - 1
)EOF", "text/css");
const uint64_t css_hash = FastHashConstEval(CSS, CSS_LEN, 0);
void css_route(const httplib::Request& req, httplib::Response& res) {
res.set_header("ETag", std::string(1, '"') + std::to_string(css_hash) + '"');
res.set_header("Cache-Control", "max-age=31536000, immutable");
if (should_send_304(req, css_hash)) {
res.status = 304;
res.set_header("Content-Length", std::to_string(CSS_LEN));
res.set_header("Content-Type", "text/css");
} else {
res.set_content(CSS, CSS_LEN, "text/css");
}
}

2
routes/routes.h
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@ -5,6 +5,8 @@
struct Config; // forward declaration from ../config.h
class PixivClient; // forward declaration from ../pixivclient.h
extern const uint64_t css_hash;
void home_route(const httplib::Request& req, httplib::Response& res, const Config& config);
void css_route(const httplib::Request& req, httplib::Response& res);
void user_illustrations_route(const httplib::Request& req, httplib::Response& res, const Config& config, PixivClient& pixiv_client);

30
servehelper.cpp
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@ -1,8 +1,10 @@
#include <regex>
#include <FastHash.h>
#include "config.h"
#include "pixivmodels.h"
#include "servehelper.h"
#include "routes/routes.h"
static Element generate_pager(const Illusts& illusts, size_t page, const char* id);
static inline Element generate_illusts_grid(const httplib::Request& req, const Config& config, const Illusts& illusts);
@ -16,16 +18,26 @@ void serve(const httplib::Request& req, httplib::Response& res, const Config& co
res.set_header("Content-Security-Policy", "default-src 'none'; style-src "s + css_url
+ "; img-src https://s.pximg.net " + config.image_proxy_url.get_origin());
Element html("html", {
std::string html = "<!DOCTYPE html>"s + Element("html", {
Element("head", {
Element("meta", {{"charset", "utf-8"}}, {}),
Element("title", {std::move(title)}),
Element("link", {{"rel", "stylesheet"}, {"href", std::move(css_url)}}, {}),
Element("link", {{"rel", "stylesheet"}, {"href", std::move(css_url) + "?v=" + std::to_string(css_hash)}}, {}),
Element("meta", {{"name", "viewport"}, {"content", "width=device-width,initial-scale=1"}}, {})
}),
std::move(element)
});
res.set_content("<!DOCTYPE html>"s + html.serialize(), "text/html");
}).serialize();
uint64_t hash = FastHash(html.data(), html.size(), 0);
res.set_header("ETag", std::string(1, '"') + std::to_string(hash) + '"');
if (should_send_304(req, hash)) {
res.status = 304;
res.set_header("Content-Length", std::to_string(html.size()));
res.set_header("Content-Type", "text/html");
} else {
res.set_content(std::move(html), "text/html");
}
}
void serve_error(const httplib::Request& req, httplib::Response& res, const Config& config,
@ -100,6 +112,16 @@ std::string proxy_image_url(const Config& config, blankie::murl::Url url) {
return proxy_url(config.image_proxy_url, std::move(url));
}
bool should_send_304(const httplib::Request& req, uint64_t hash) {
std::string header = req.get_header_value("If-None-Match");
if (header == "*") {
return true;
}
size_t pos = header.find(std::string(1, '"') + std::to_string(hash) + '"');
return pos != std::string::npos && (pos == 0 || header[pos - 1] != '/');
}
Element generate_illusts_pager(const httplib::Request& req, const Config& config, const Illusts& illusts, size_t page, const char* id) {

1
servehelper.h
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@ -18,5 +18,6 @@ void serve_redirect(const httplib::Request& req, httplib::Response& res, const C
std::string get_origin(const httplib::Request& req, const Config& config);
std::string proxy_url(blankie::murl::Url base, blankie::murl::Url url);
std::string proxy_image_url(const Config& config, blankie::murl::Url url);
bool should_send_304(const httplib::Request& req, uint64_t hash);
Element generate_illusts_pager(const httplib::Request& req, const Config& config, const Illusts& illusts, size_t page, const char* id);

80
thirdparty/FastHash.h vendored Normal file
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@ -0,0 +1,80 @@
// https://github.com/KoneLinx/small_ECS/blob/master/FastHash.h
// but slightly modified to add FastHashConstEval and abandon ranges
// Copyright(C) 2021 Kobe Vrijsen <kobevrijsen@posteo.be>
//
// A simple ECS example
//
// This file is free software and distributed under the terms of the European Union
// Public Lincense as published by the European Commision; either version 1.2 of the
// License, or , at your option, any later version.
/* The MIT License
Copyright (C) 2012 Zilong Tan (eric.zltan@gmail.com)
Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use, copy,
modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
// Source: fast-hash https://github.com/ztanml/fast-hash (26 Nov 2021)
// Changes: General uplift and providing a general constant hash for ranges
#pragma once
// Compression function for Merkle-Damgard construction.
// This function is generated using the framework provided.
//#define mix(h) ({
// (h) ^= (h) >> 23;
// (h) *= 0x2127599bf4325c37ULL;
// (h) ^= (h) >> 47; })
constexpr uint64_t FastHash(const char* str, size_t size, uint64_t seed/*, uint64_t back = {}*/)
{
auto const mix = [](uint64_t h)
{
h ^= h >> 23;
h *= 0x2127599bf4325c37ULL;
h ^= h >> 47;
return h;
};
const uint64_t m = 0x880355f21e6d1965ULL;
uint64_t h = seed ^ (size * m);
for (size_t i = 0; i < size; i++)
{
h ^= mix(static_cast<uint64_t>(str[i]));
h *= m;
}
//if (back != uint64_t())
//{
// h ^= mix(back);
// h *= m;
//}
return mix(h);
}
consteval uint64_t FastHashConstEval(const char* str, size_t size, uint64_t seed) {
return FastHash(str, size, seed);
}