[4.x] Add LogTenancyBootstrapper

src/Bootstrappers/LogTenancyBootstrapper.php

@@ -0,0 +1,137 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Stancl\Tenancy\Bootstrappers;
+
+use Closure;
+use Illuminate\Contracts\Config\Repository as Config;
+use Illuminate\Log\LogManager;
+use Stancl\Tenancy\Contracts\TenancyBootstrapper;
+use Stancl\Tenancy\Contracts\Tenant;
+
+/**
+ * This bootstrapper makes it possible to configure tenant-specific logging.
+ *
+ * By default, the storage path channels ('single' and 'daily' by default,
+ * but feel free to customize that using the $storagePathChannels property)
+ * are configured to use tenant storage directories.
+ * For this to work correctly, this bootstrapper must run *after* FilesystemTenancyBootstrapper.
+ *
+ * The bootstrapper also supports custom channel overrides via the $channelOverrides property (see the property's docblock).
+ *
+ * @see Stancl\Tenancy\Bootstrappers\FilesystemTenancyBootstrapper
+ */
+class LogTenancyBootstrapper implements TenancyBootstrapper
+{
+    protected array $defaultConfig = [];
+
+    /**
+     * Log channels that use the storage_path() helper for storing the logs.
+     * Requires FilesystemTenancyBootstrapper to run before this bootstrapper.
+     */
+    public static array $storagePathChannels = ['single', 'daily'];
+
+    /**
+     * Custom channel configuration overrides.
+     *
+     * Examples:
+     * - Array mapping (the default approach): ['slack' => ['url' => 'webhookUrl']] maps $tenant->webhookUrl to slack.url (if $tenant->webhookUrl is not null, otherwise, the override is ignored)
+     * - Closure: ['slack' => fn ($config, $tenant) => $config->set('logging.channels.slack.url', $tenant->slackUrl)]
+     */
+    public static array $channelOverrides = [];
+
+    public function __construct(
+        protected Config $config,
+        protected LogManager $logManager,
+    ) {}
+
+    public function bootstrap(Tenant $tenant): void
+    {
+        $this->defaultConfig = $this->config->get('logging.channels');
+        $channels = $this->getChannels();
+
+        $this->configureChannels($channels, $tenant);
+        $this->forgetChannels($channels);
+    }
+
+    public function revert(): void
+    {
+        $this->config->set('logging.channels', $this->defaultConfig);
+
+        $this->forgetChannels($this->getChannels());
+    }
+
+    /**
+     * Channels to configure and re-resolve afterwards (including the channels in the log stack).
+     */
+    protected function getChannels(): array
+    {
+        // Get the currently used (default) logging channel
+        $defaultChannel = $this->config->get('logging.default');
+        $channelIsStack = $this->config->get("logging.channels.{$defaultChannel}.driver") === 'stack';
+
+        // If the default channel is stack, also get all the channels it contains.
+        // The stack channel also has to be included in the list of channels
+        // since the channel will be resolved and saved in the log manager,
+        // and its config could accidentally be used instead of the underlying channels.
+        //
+        // For example, when you use 'stack' with the 'slack' channel and you want to configure the webhook URL,
+        // both the 'stack' and the 'slack' must be re-resolved after updating the config for the channels to use the correct webhook URLs.
+        // If only one of the mentioned channels would be re-resolved, the other's webhook URL would be used for logging.
+        $channels = $channelIsStack
+            ? [$defaultChannel, ...$this->config->get("logging.channels.{$defaultChannel}.channels")]
+            : [$defaultChannel];
+
+        return $channels;
+    }
+
+    /**
+     * Configure channels for the tenant context.
+     *
+     * Only the channels that are in the $storagePathChannels array
+     * or have custom overrides in the $channelOverrides property
+     * will be configured.
+     */
+    protected function configureChannels(array $channels, Tenant $tenant): void
+    {
+        foreach ($channels as $channel) {
+            if (isset(static::$channelOverrides[$channel])) {
+                $this->overrideChannelConfig($channel, static::$channelOverrides[$channel], $tenant);
+            } elseif (in_array($channel, static::$storagePathChannels)) {
+                // Set storage path channels to use tenant-specific directory (default behavior)
+                // The tenant log will be located at e.g. "storage/tenant{$tenantKey}/logs/laravel.log"
+                $this->config->set("logging.channels.{$channel}.path", storage_path('logs/laravel.log'));
+            }
+        }
+    }
+
+    protected function overrideChannelConfig(string $channel, array|Closure $override, Tenant $tenant): void
+    {
+        if (is_array($override)) {
+            // Map tenant attributes to channel config keys.
+            // If the tenant attribute is null,
+            // the override is ignored and the channel config key's value remains unchanged.
+            foreach ($override as $configKey => $tenantAttributeName) {
+                $tenantAttribute = $tenant->getAttribute($tenantAttributeName);
+
+                if ($tenantAttribute !== null) {
+                    $this->config->set("logging.channels.{$channel}.{$configKey}", $tenantAttribute);
+                }
+            }
+        } elseif ($override instanceof Closure) {
+            $override($this->config, $tenant);
+        }
+    }
+
+    /**
+     * Forget all passed channels so they can be re-resolved
+     * with updated config on the next logging attempt.
+     */
+    protected function forgetChannels(array $channels): void
+    {
+        foreach ($channels as $channel) {
+            $this->logManager->forgetChannel($channel);
+        }
+    }
+}