patch char name length by create

docker/patch-character-name-length.js

@@ -0,0 +1,55 @@
+#!/usr/bin/env node
+// Local patch: make the minimum length for newly created character names
+// configurable.
+//
+// Upstream's is_name_allowed() rejects names shorter than 4 characters, while
+// is_name_xallowed() already accepts 1-12 for rename, chat and login. Three
+// character names are therefore fully supported; the 4-character gate only
+// applies to character creation and makes them a paid rename target (24,000
+// shells). This patch reads options.character_name_min_length (default 4) so a
+// local server can allow 3-character names at creation without changing the
+// rename rules or prices.
+//
+// The patch is idempotent and fails loudly if the anchor is gone.
+
+const fs = require("node:fs");
+const path = require("node:path");
+
+const app = path.resolve(process.argv[2] || "/app");
+const file = path.join(app, "api.js");
+let source = fs.readFileSync(file, "utf8");
+
+const oldLine = "\tif (name.length < 4) return false;";
+const newLines = [
+	"\tvar min_length =",
+	'\t\ttypeof options === "undefined" || !options || options.character_name_min_length === undefined',
+	"\t\t\t? 4",
+	"\t\t\t: Number(options.character_name_min_length);",
+	"\tif (!Number.isSafeInteger(min_length) || min_length < 1 || min_length > 12) min_length = 4;",
+	"\tif (name.length < min_length) return false;",
+].join("\n");
+
+function fail(message) {
+	console.error("patch-character-name-length: " + message);
+	process.exit(1);
+}
+
+const marker = "options.character_name_min_length";
+const oldCount = source.split(oldLine).length - 1;
+const patchedCount = source.split("if (name.length < min_length) return false;").length - 1;
+
+if (oldCount === 1 && patchedCount === 0) {
+	source = source.replace(oldLine, newLines);
+	fs.writeFileSync(file, source);
+	console.log("patch-character-name-length: patched " + file);
+} else if (oldCount === 0 && patchedCount === 1 && source.includes(marker)) {
+	console.log("patch-character-name-length: already patched");
+} else {
+	fail(
+		"expected 1 unpatched creation length check, found " +
+			oldCount +
+			" unpatched and " +
+			patchedCount +
+			" patched; refusing partial patch",
+	);
+}