feat: initial 6-character HID rework

PluralKit.Core/Database/Functions/functions.sql

@@ -122,13 +122,13 @@ begin
 end
 $$ language plpgsql;
 
-create function generate_hid() returns char(5) as $$
-    select string_agg(substr('abcdefghijklmnopqrstuvwxyz', ceil(random() * 26)::integer, 1), '') from generate_series(1, 5)
+create function generate_hid() returns char(6) as $$
+    select string_agg(substr('abcefghjknoprstuvwxyz', ceil(random() * 21)::integer, 1), '') from generate_series(1, 6)
 $$ language sql volatile;
 
 
-create function find_free_system_hid() returns char(5) as $$
-declare new_hid char(5);
+create function find_free_system_hid() returns char(6) as $$
+declare new_hid char(6);
 begin
     loop
         new_hid := generate_hid();
@@ -138,8 +138,8 @@ end
 $$ language plpgsql volatile;
 
 
-create function find_free_member_hid() returns char(5) as $$
-declare new_hid char(5);
+create function find_free_member_hid() returns char(6) as $$
+declare new_hid char(6);
 begin
     loop
         new_hid := generate_hid();
@@ -148,8 +148,9 @@ begin
 end
 $$ language plpgsql volatile;
 
-create function find_free_group_hid() returns char(5) as $$
-declare new_hid char(5);
+
+create function find_free_group_hid() returns char(6) as $$
+declare new_hid char(6);
 begin
     loop
         new_hid := generate_hid();

PluralKit.Core/Database/Migrations/42.sql

@@ -0,0 +1,10 @@
+-- database version 42
+-- move to 6 character HIDs, add HID display config setting
+
+alter table systems alter column hid type char(6) using rpad(hid, 6, ' ');
+alter table members alter column hid type char(6) using rpad(hid, 6, ' ');
+alter table groups alter column hid type char(6) using rpad(hid, 6, ' ');
+
+alter table system_config add column hid_display_split bool default false;
+
+update info set schema_version = 42;

PluralKit.Core/Database/Utils/DatabaseMigrator.cs

@@ -9,7 +9,7 @@ namespace PluralKit.Core;
 internal class DatabaseMigrator
 {
     private const string RootPath = "PluralKit.Core.Database"; // "resource path" root for SQL files
-    private const int TargetSchemaVersion = 41;
+    private const int TargetSchemaVersion = 42;
     private readonly ILogger _logger;
 
     public DatabaseMigrator(ILogger logger)

PluralKit.Core/Database/Utils/HidUtils.cs

@@ -0,0 +1,35 @@
+using System.Linq;
+using System.Text.RegularExpressions;
+
+namespace PluralKit.Core;
+
+public static class HidUtils
+{
+    private static readonly Regex _hidRegex = new(@"^[a-zA-Z]{5,6}$");
+
+    public static string? ParseHid(string input)
+    {
+        input = input.ToLower().Replace("-", null);
+        if (!_hidRegex.IsMatch(input))
+            return null;
+
+        return input;
+    }
+
+    public static bool TryParseHid(this string input, out string hid)
+    {
+        hid = ParseHid(input);
+        return hid != null;
+    }
+
+    public static string HidTransform(string input, bool split = false)
+    {
+        if (split && input.Length > 5)
+        {
+            var len = (int)Math.Floor(input.Length / 2.0);
+            input = string.Concat(input.AsSpan(0, len), "-", input.AsSpan(len));
+        }
+
+        return input;
+    }
+}