暂存

vendor/illuminate/http/Middleware/SetCacheHeaders.php

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+<?php
+
+namespace Illuminate\Http\Middleware;
+
+use Closure;
+use Illuminate\Support\Carbon;
+use Illuminate\Support\Collection;
+use Illuminate\Support\Str;
+use Symfony\Component\HttpFoundation\BinaryFileResponse;
+use Symfony\Component\HttpFoundation\StreamedResponse;
+
+class SetCacheHeaders
+{
+    /**
+     * Specify the options for the middleware.
+     *
+     * @param  array|string  $options
+     * @return string
+     */
+    public static function using($options)
+    {
+        if (is_string($options)) {
+            return static::class.':'.$options;
+        }
+
+        return (new Collection($options))
+            ->map(function ($value, $key) {
+                if (is_bool($value)) {
+                    return $value ? $key : null;
+                }
+
+                return is_int($key) ? $value : "{$key}={$value}";
+            })
+            ->filter()
+            ->map(fn ($value) => Str::finish($value, ';'))
+            ->pipe(fn ($options) => rtrim(static::class.':'.$options->implode(''), ';'));
+    }
+
+    /**
+     * Add cache related HTTP headers.
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @param  \Closure  $next
+     * @param  string|array  $options
+     * @return \Symfony\Component\HttpFoundation\Response
+     *
+     * @throws \InvalidArgumentException
+     */
+    public function handle($request, Closure $next, $options = [])
+    {
+        $response = $next($request);
+
+        if (! $request->isMethodCacheable() || (! $response->getContent() && ! $response instanceof BinaryFileResponse && ! $response instanceof StreamedResponse)) {
+            return $response;
+        }
+
+        if (is_string($options)) {
+            $options = $this->parseOptions($options);
+        }
+
+        if (! $response->isSuccessful()) {
+            return $response;
+        }
+
+        if (isset($options['etag']) && $options['etag'] === true) {
+            $options['etag'] = $response->getEtag() ?? ($response->getContent() ? hash('xxh128', $response->getContent()) : null);
+        }
+
+        if (isset($options['last_modified'])) {
+            if (is_numeric($options['last_modified'])) {
+                $options['last_modified'] = Carbon::createFromTimestamp($options['last_modified'], date_default_timezone_get());
+            } else {
+                $options['last_modified'] = Carbon::parse($options['last_modified']);
+            }
+        }
+
+        $response->setCache($options);
+        $response->isNotModified($request);
+
+        return $response;
+    }
+
+    /**
+     * Parse the given header options.
+     *
+     * @param  string  $options
+     * @return array
+     */
+    protected function parseOptions($options)
+    {
+        return (new Collection(explode(';', rtrim($options, ';'))))->mapWithKeys(function ($option) {
+            $data = explode('=', $option, 2);
+
+            return [$data[0] => $data[1] ?? true];
+        })->all();
+    }
+}