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using System;
using System.IO;
using Newtonsoft.Json;
using StardewModdingAPI.Toolkit.Serialisation;
using StardewModdingAPI.Toolkit.Utilities;
using StardewValley;
namespace StardewModdingAPI.Framework.ModHelpers
{
/// <summary>Provides an API for reading and storing local mod data.</summary>
internal class DataHelper : BaseHelper, IDataHelper
{
/*********
** Properties
*********/
/// <summary>Encapsulates SMAPI's JSON file parsing.</summary>
private readonly JsonHelper JsonHelper;
/// <summary>The absolute path to the mod folder.</summary>
private readonly string ModFolderPath;
/*********
** Public methods
*********/
/// <summary>Construct an instance.</summary>
/// <param name="modID">The unique ID of the relevant mod.</param>
/// <param name="modFolderPath">The absolute path to the mod folder.</param>
/// <param name="jsonHelper">The absolute path to the mod folder.</param>
public DataHelper(string modID, string modFolderPath, JsonHelper jsonHelper)
: base(modID)
{
this.ModFolderPath = modFolderPath;
this.JsonHelper = jsonHelper;
}
/****
** JSON file
****/
/// <summary>Read data from a JSON file in the mod's folder.</summary>
/// <typeparam name="TModel">The model type. This should be a plain class that has public properties for the data you want. The properties can be complex types.</typeparam>
/// <param name="path">The file path relative to the mod folder.</param>
/// <returns>Returns the deserialised model, or <c>null</c> if the file doesn't exist or is empty.</returns>
/// <exception cref="InvalidOperationException">The <paramref name="path"/> is not relative or contains directory climbing (../).</exception>
public TModel ReadJsonFile<TModel>(string path) where TModel : class
{
if (!PathUtilities.IsSafeRelativePath(path))
throw new InvalidOperationException($"You must call {nameof(IModHelper.Data)}.{nameof(this.ReadJsonFile)} with a relative path.");
path = Path.Combine(this.ModFolderPath, PathUtilities.NormalisePathSeparators(path));
return this.JsonHelper.ReadJsonFileIfExists(path, out TModel data)
? data
: null;
}
/// <summary>Save data to a JSON file in the mod's folder.</summary>
/// <typeparam name="TModel">The model type. This should be a plain class that has public properties for the data you want. The properties can be complex types.</typeparam>
/// <param name="path">The file path relative to the mod folder.</param>
/// <param name="data">The arbitrary data to save.</param>
/// <exception cref="InvalidOperationException">The <paramref name="path"/> is not relative or contains directory climbing (../).</exception>
public void WriteJsonFile<TModel>(string path, TModel data) where TModel : class
{
if (!PathUtilities.IsSafeRelativePath(path))
throw new InvalidOperationException($"You must call {nameof(IMod.Helper)}.{nameof(IModHelper.Data)}.{nameof(this.WriteJsonFile)} with a relative path (without directory climbing).");
path = Path.Combine(this.ModFolderPath, PathUtilities.NormalisePathSeparators(path));
this.JsonHelper.WriteJsonFile(path, data);
}
/****
** Save file
****/
/// <summary>Read arbitrary data stored in the current save slot. This is only possible if a save has been loaded.</summary>
/// <typeparam name="TModel">The model type. This should be a plain class that has public properties for the data you want. The properties can be complex types.</typeparam>
/// <param name="key">The unique key identifying the data.</param>
/// <returns>Returns the parsed data, or <c>null</c> if the entry doesn't exist or is empty.</returns>
/// <exception cref="InvalidOperationException">The player hasn't loaded a save file yet or isn't the main player.</exception>
public TModel ReadSaveData<TModel>(string key) where TModel : class
{
if (!Context.IsSaveLoaded)
throw new InvalidOperationException($"Can't use {nameof(IMod.Helper)}.{nameof(IModHelper.Data)}.{nameof(this.ReadSaveData)} when a save file isn't loaded.");
if (!Context.IsMainPlayer)
throw new InvalidOperationException($"Can't use {nameof(IMod.Helper)}.{nameof(IModHelper.Data)}.{nameof(this.ReadSaveData)} because this isn't the main player. (Save files are stored on the main player's computer.)");
return Game1.CustomData.TryGetValue(this.GetSaveFileKey(key), out string value)
? this.JsonHelper.Deserialise<TModel>(value)
: null;
}
/// <summary>Save arbitrary data to the current save slot. This is only possible if a save has been loaded, and the data will be lost if the player exits without saving the current day.</summary>
/// <typeparam name="TModel">The model type. This should be a plain class that has public properties for the data you want. The properties can be complex types.</typeparam>
/// <param name="key">The unique key identifying the data.</param>
/// <param name="data">The arbitrary data to save.</param>
/// <exception cref="InvalidOperationException">The player hasn't loaded a save file yet or isn't the main player.</exception>
public void WriteSaveData<TModel>(string key, TModel data) where TModel : class
{
if (!Context.IsSaveLoaded)
throw new InvalidOperationException($"Can't use {nameof(IMod.Helper)}.{nameof(IModHelper.Data)}.{nameof(this.WriteSaveData)} when a save file isn't loaded.");
if (!Context.IsMainPlayer)
throw new InvalidOperationException($"Can't use {nameof(IMod.Helper)}.{nameof(IModHelper.Data)}.{nameof(this.ReadSaveData)} because this isn't the main player. (Save files are stored on the main player's computer.)");
string internalKey = this.GetSaveFileKey(key);
if (data != null)
Game1.CustomData[internalKey] = this.JsonHelper.Serialise(data, Formatting.None);
else
Game1.CustomData.Remove(internalKey);
}
/****
** Global app data
****/
/// <summary>Read arbitrary data stored on the local computer, synchronised by GOG/Steam if applicable.</summary>
/// <typeparam name="TModel">The model type. This should be a plain class that has public properties for the data you want. The properties can be complex types.</typeparam>
/// <param name="key">The unique key identifying the data.</param>
/// <returns>Returns the parsed data, or <c>null</c> if the entry doesn't exist or is empty.</returns>
public TModel ReadGlobalData<TModel>(string key) where TModel : class
{
string path = this.GetGlobalDataPath(key);
return this.JsonHelper.ReadJsonFileIfExists(path, out TModel data)
? data
: null;
}
/// <summary>Save arbitrary data to the local computer, synchronised by GOG/Steam if applicable.</summary>
/// <typeparam name="TModel">The model type. This should be a plain class that has public properties for the data you want. The properties can be complex types.</typeparam>
/// <param name="key">The unique key identifying the data.</param>
/// <param name="data">The arbitrary data to save.</param>
public void WriteGlobalData<TModel>(string key, TModel data) where TModel : class
{
string path = this.GetGlobalDataPath(key);
if (data != null)
this.JsonHelper.WriteJsonFile(path, data);
else
File.Delete(path);
}
/*********
** Public methods
*********/
/// <summary>Get the unique key for a save file data entry.</summary>
/// <param name="key">The unique key identifying the data.</param>
private string GetSaveFileKey(string key)
{
this.AssertSlug(key, nameof(key));
return $"smapi/mod-data/{this.ModID}/{key}".ToLower();
}
/// <summary>Get the absolute path for a global data file.</summary>
/// <param name="key">The unique key identifying the data.</param>
private string GetGlobalDataPath(string key)
{
this.AssertSlug(key, nameof(key));
return Path.Combine(Constants.SavesPath, ".smapi", "mod-data", this.ModID.ToLower(), $"{key}.json".ToLower());
}
/// <summary>Assert that a key contains only characters that are safe in all contexts.</summary>
/// <param name="key">The key to check.</param>
/// <param name="paramName">The argument name for any assertion error.</param>
private void AssertSlug(string key, string paramName)
{
if (!PathUtilities.IsSlug(key))
throw new ArgumentException("The data key is invalid (keys must only contain letters, numbers, underscores, periods, or hyphens).", paramName);
}
}
}
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