Command to fix custom field unicode conversion differences between PHP versions

app/Console/Commands/ReEncodeCustomFieldNames.php

@@ -0,0 +1,126 @@
+<?php
+
+namespace App\Console\Commands;
+
+use App\Models\CustomField;
+use Illuminate\Console\Command;
+
+class ReEncodeCustomFieldNames extends Command
+{
+    /**
+     * The name and signature of the console command.
+     *
+     * @var string
+     */
+    protected $signature = 'snipeit:regenerate-fieldnames';
+
+    /**
+     * The console command description.
+     *
+     * @var string
+     */
+    protected $description = 'This utility will regenerate the column names for custom fields. It should typically only be needed when a PHP upgrade changed the behavior of the unicode conversion between versions.';
+
+    /**
+     * Create a new command instance.
+     *
+     * @return void
+     */
+    public function __construct()
+    {
+        parent::__construct();
+    }
+
+    /**
+     * All three of these things must match for the custom fields system to work as expected:
+     *
+     * - what the system thinks the output of $field->convertUnicodeDbSlug() is
+     * - the actual db_column name in the customfields table
+     * - the physical column name that was created on the assets table
+     *
+     * For some people who upgraded their version of PHP, the unicode converter now behaves
+     * differently in than it did when their custom fields were first created, specifically as it
+     * relates to handling slashes, ampersands, etc. This can result in the field names no longer
+     * matching up, as an older version of the PHP extension simply dropped slashes, etc, while the
+     * newer version of the PHP extension will convert them to underscores.
+     *
+     * @return mixed
+     */
+    public function handle()
+    {
+
+        if ($this->confirm('This will regenerate all of the custom field database fieldnames in your database. THIS WILL CHANGE YOUR SCHEMA AND SHOULD NOT BE DONE WITHOUT MAKING A BACKUP FIRST. Do you wish to continue?'))
+        {
+
+            /** Get all of the custom fields */
+            $fields = CustomField::get();
+
+            $asset_columns = \DB::getSchemaBuilder()->getColumnListing('assets');
+            $custom_field_columns = array();
+
+            /** Loop through the columns on the assets table */
+            foreach ($asset_columns as $asset_column) {
+
+                /** Add ones that start with _snipeit_ to an array for handling */
+                if (strpos($asset_column, '_snipeit_') === 0) {
+
+                    /**
+                     * Get the ID of the custom field based on the fieldname.
+                     * For example, in _snipeit_mac_address_1, we grab the 1 because we know
+                     * that's the ID of the custom field that created the column.
+                     * Then use that ID as the array key for use comparing the actual assets field name
+                     * and the db_column value from the custom fields table.
+                     */
+                    $last_part = substr(strrchr($asset_column, "_snipeit_"), 1);
+                    $custom_field_columns[$last_part] = $asset_column;
+                }
+            }
+
+            foreach ($fields as $field) {
+
+                $this->info($field->name .' ('.$field->id.') column should be '. $field->convertUnicodeDbSlug().'');
+
+                /** The assets table has the column it should have, all is well */
+                if (\Schema::hasColumn('assets', $field->convertUnicodeDbSlug()))
+                {
+                    $this->info('-- ✓ This field exists - all good');
+
+                /**
+                 * There is a mismatch between the fieldname on the assets table and
+                 * what $field->convertUnicodeDbSlug() is *now* expecting.
+                 */
+                } else {
+                        $this->warn('-- X Field mismatch: updating... ');
+
+                        /** Make sure the custom_field_columns array has the ID */
+                        if (array_key_exists($field->id, $custom_field_columns)) {
+
+                            /**
+                             * Update the asset schema to the corrected fieldname that will be recognized by the
+                             *  system elsewhere that we use $field->convertUnicodeDbSlug()
+                             */
+                            \Schema::table('assets', function($table) use ($custom_field_columns, $field) {
+                                $table->renameColumn($custom_field_columns[$field->id], $field->convertUnicodeDbSlug());
+                            });
+
+                            $this->warn('-- ✓ Field updated from '.$custom_field_columns[$field->id].' to '.$field->convertUnicodeDbSlug());
+
+                        } else {
+                            $this->warn('-- X WARNING: There is no field on the assets table ending in  '.$field->id.'. This may require more in-depth investigation and may mean the schema was altered manually.');
+                        }
+                }
+
+                /** Update the db_column property in the custom fields table, just in case it doesn't match the other
+                 * things.
+                 */
+                $field->db_column = $field->convertUnicodeDbSlug();
+                $field->save();
+
+
+            }
+
+        }
+
+
+    }
+}

app/Console/Kernel.php

@@ -2,6 +2,7 @@
 
 namespace App\Console;
 
+use App\Console\Commands\ImportLocations;
 use App\Console\Commands\RestoreDeletedUsers;
 use Illuminate\Console\Scheduling\Schedule;
 use Illuminate\Foundation\Console\Kernel as ConsoleKernel;
@@ -34,6 +35,7 @@ class Kernel extends ConsoleKernel
         Commands\RestoreDeletedUsers::class,
         Commands\SendUpcomingAuditReport::class,
         Commands\ImportLocations::class,
+        Commands\ReEncodeCustomFieldNames::class,
     ];
 
     /**