Add validation for new file names for sql projects (#21601)

* Add validation for new file names for sql projects

* Addres comments and add validation for new project dialog

* Address comments

* Address comments on test

* Fix tests

* Remove extra error messages and rename file

* Address comments

* Fix tests

* Add test file back

extensions/data-workspace/src/common/pathUtilsHelper.ts

@@ -0,0 +1,136 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import * as constants from './constants';
+import * as os from 'os';
+import * as path from 'path';
+
+const WINDOWS_INVALID_FILE_CHARS = /[\\/:\*\?"<>\|]/g;
+const UNIX_INVALID_FILE_CHARS = /[\\/]/g;
+const isWindows = os.platform() === 'win32';
+const WINDOWS_FORBIDDEN_NAMES = /^(con|prn|aux|clock\$|nul|lpt[0-9]|com[0-9])$/i;
+
+/**
+ * Determines if a given character is a valid filename character
+ * @param c Character to validate
+ */
+export function isValidFilenameCharacter(c: string): boolean {
+	// only a character should be passed
+	if (!c || c.length !== 1) {
+		return false;
+	}
+	WINDOWS_INVALID_FILE_CHARS.lastIndex = 0;
+	UNIX_INVALID_FILE_CHARS.lastIndex = 0;
+	if (isWindows && WINDOWS_INVALID_FILE_CHARS.test(c)) {
+		return false;
+	} else if (!isWindows && UNIX_INVALID_FILE_CHARS.test(c)) {
+		return false;
+	}
+
+	return true;
+}
+
+/**
+ * Replaces invalid filename characters in a string with underscores
+ * @param s The string to be sanitized for a filename
+ */
+export function sanitizeStringForFilename(s: string): string {
+	// replace invalid characters with an underscore
+	let result = '';
+	for (let i = 0; i < s.length; ++i) {
+		result += isValidFilenameCharacter(s[i]) ? s[i] : '_';
+	}
+
+	return result;
+}
+
+/**
+ * Returns true if the string is a valid filename
+ * Logic is copied from src\vs\base\common\extpath.ts
+ * @param name filename to check
+ */
+export function isValidBasename(name?: string): boolean {
+	const invalidFileChars = isWindows ? WINDOWS_INVALID_FILE_CHARS : UNIX_INVALID_FILE_CHARS;
+
+	if (!name) {
+		return false;
+	}
+
+	if (isWindows && name[name.length - 1] === '.') {
+		return false; // Windows: file cannot end with a "."
+	}
+
+	let basename = path.parse(name).name;
+	if (!basename || basename.length === 0 || /^\s+$/.test(basename)) {
+		return false; // require a name that is not just whitespace
+	}
+
+	invalidFileChars.lastIndex = 0;
+	if (invalidFileChars.test(basename)) {
+		return false; // check for certain invalid file characters
+	}
+
+	if (isWindows && WINDOWS_FORBIDDEN_NAMES.test(basename)) {
+		return false; // check for certain invalid file names
+	}
+
+	if (basename === '.' || basename === '..') {
+		return false; // check for reserved values
+	}
+
+	if (isWindows && basename.length !== basename.trim().length) {
+		return false; // Windows: file cannot end with a whitespace
+	}
+
+	if (basename.length > 255) {
+		return false; // most file systems do not allow files > 255 length
+	}
+
+	return true;
+}
+
+/**
+ * Returns specific error message if file name is invalid
+ * Logic is copied from src\vs\base\common\extpath.ts
+ * @param name filename to check
+ */
+export function isValidBasenameErrorMessage(name?: string): string {
+	const invalidFileChars = isWindows ? WINDOWS_INVALID_FILE_CHARS : UNIX_INVALID_FILE_CHARS;
+	if (!name) {
+		return constants.undefinedFilenameErrorMessage;
+	}
+
+	if (isWindows && name[name.length - 1] === '.') {
+		return constants.filenameEndingIsPeriodErrorMessage; // Windows: file cannot end with a "."
+	}
+
+	let basename = path.parse(name).name;
+	if (!basename || basename.length === 0 || /^\s+$/.test(basename)) {
+		return constants.whitespaceFilenameErrorMessage; // require a name that is not just whitespace
+	}
+
+	invalidFileChars.lastIndex = 0;
+	if (invalidFileChars.test(basename)) {
+		return constants.invalidFileCharsErrorMessage; // check for certain invalid file characters
+	}
+
+	if (isWindows && WINDOWS_FORBIDDEN_NAMES.test(basename)) {
+		return constants.reservedWindowsFilenameErrorMessage; // check for certain invalid file names
+	}
+
+	if (basename === '.' || basename === '..') {
+		return constants.reservedValueErrorMessage; // check for reserved values
+	}
+
+	if (isWindows && basename.length !== basename.trim().length) {
+		return constants.trailingWhitespaceErrorMessage; // Windows: file cannot end with a whitespace
+	}
+
+	if (basename.length > 255) {
+		return constants.tooLongFilenameErrorMessage; // most file systems do not allow files > 255 length
+	}
+
+	return '';
+}