1 files changed, 94 insertions, 0 deletions
diff --git a/tools/Crupest.V2ray/Crupest.V2ray/FileUtility.cs b/tools/Crupest.V2ray/Crupest.V2ray/FileUtility.cs
new file mode 100644
index 0000000..08de673
--- /dev/null
+++ b/tools/Crupest.V2ray/Crupest.V2ray/FileUtility.cs
@@ -0,0 +1,94 @@
+using System.Text.Json;
+using System.Text.RegularExpressions;
+
+namespace Crupest.V2ray;
+
+public static partial class FileUtility
+{
+    public static List<string> ReadList(string str)
+    {
+        return str.Split("\n", StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries).ToList();
+    }
+
+    public static Dictionary<string, string> ReadDictionary(string str, bool keyToLower = true)
+    {
+        var lines = str.Split("\n", StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
+        var result = new Dictionary<string, string>();
+        for (int lineNumber = 0; lineNumber < lines.Length; lineNumber++)
+        {
+            var line = lines[lineNumber];
+            if (!line.Contains('='))
+            {
+                throw new FormatException($"Line {lineNumber + 1} does not contain a '='.");
+            }
+            var equalIndex = line.IndexOf('=');
+            var key = line[..equalIndex].Trim();
+            if (keyToLower) key = key.ToLower();
+            var value = line[(equalIndex + 1)..].Trim();
+            result[key] = value;
+        }
+        return result;
+    }
+
+    public static List<string> ReadListFile(string path, bool required = true)
+    {
+        if (File.Exists(path))
+        {
+            return ReadList(File.ReadAllText(path));
+        }
+        else
+        {
+            if (required)
+            {
+                throw new FileNotFoundException($"File {path} is required but it does not exist.");
+            }
+            return new();
+        }
+    }
+
+    public static Dictionary<string, string> ReadDictionaryFile(string path, bool required = true, bool keyToLower = true)
+    {
+        if (File.Exists(path))
+        {
+            return ReadDictionary(File.ReadAllText(path), keyToLower);
+        }
+        else
+        {
+            if (required)
+            {
+                throw new FileNotFoundException($"File {path} is required but it does not exist.");
+            }
+            return new();
+        }
+    }
+
+    private static Regex TemplateValuePattern { get; } = CreateTemplateValuePattern();
+
+    [GeneratedRegex(@"\$\{\s*([_a-zA-Z][_a-zA-Z0-9]*)\s*\}")]
+    private static partial Regex CreateTemplateValuePattern();
+
+    public static string TextFromTemplate(string template, Dictionary<string, string> dict)
+    {
+        return TemplateValuePattern.Replace(template, (match) =>
+        {
+            var key = match.Groups[1].Value;
+            if (dict.ContainsKey(key))
+            {
+                return dict[key];
+            }
+            return match.Value;
+        });
+    }
+
+    public static string JsonFormat(string json)
+    {
+        var options = new JsonSerializerOptions
+        {
+            WriteIndented = true,
+            AllowTrailingCommas = true,
+            ReadCommentHandling = JsonCommentHandling.Skip
+        };
+
+        return JsonSerializer.Serialize(JsonSerializer.Deserialize<JsonDocument>(json, options), options);
+    }
+}