Added support for drop-in mods on the UI.

app/assets/js/dropinmodutil.js

@@ -0,0 +1,109 @@
+const fs        = require('fs')
+const path      = require('path')
+const { shell } = require('electron')
+
+// Group #1: File Name (without .disabled, if any)
+// Group #2: File Extension (jar, zip, or litemod)
+// Group #3: If it is disabled (if string 'disabled' is present)
+const MOD_REGEX = /^(.+(jar|zip|litemod))(?:\.(disabled))?$/
+const DISABLED_EXT = '.disabled'
+
+/**
+ * Scan for drop-in mods in both the mods folder and version
+ * safe mods folder.
+ * 
+ * @param {string} modsDir The path to the mods directory.
+ * @param {string} version The minecraft version of the server configuration.
+ * 
+ * @returns {{fullName: string, name: string, ext: string, disabled: boolean}[]}
+ * An array of objects storing metadata about each discovered mod.
+ */
+exports.scanForDropinMods = function(modsDir, version) {
+    const modsDiscovered = []
+    if(fs.existsSync(modsDir)){
+        let modCandidates = fs.readdirSync(modsDir)
+        let verCandidates = []
+        const versionDir = path.join(modsDir, version)
+        if(fs.existsSync(versionDir)){
+            verCandidates = fs.readdirSync(versionDir)
+        }
+        for(file of modCandidates){
+            const match = MOD_REGEX.exec(file)
+            if(match != null){
+                modsDiscovered.push({
+                    fullName: match[0],
+                    name: match[1],
+                    ext: match[2],
+                    disabled: match[3] != null
+                })
+            }
+        }
+        for(file of verCandidates){
+            const match = MOD_REGEX.exec(file)
+            if(match != null){
+                modsDiscovered.push({
+                    fullName: path.join(version, match[0]),
+                    name: match[1],
+                    ext: match[2],
+                    disabled: match[3] != null
+                })
+            }
+        }
+    }
+    return modsDiscovered
+}
+
+/**
+ * Delete a drop-in mod from the file system.
+ * 
+ * @param {string} modsDir The path to the mods directory.
+ * @param {string} fullName The fullName of the discovered mod to delete.
+ * 
+ * @returns {boolean} True if the mod was deleted, otherwise false.
+ */
+exports.deleteDropinMod = function(modsDir, fullName){
+    /*return new Promise((resolve, reject) => {
+        fs.unlink(path.join(modsDir, fullName), (err) => {
+            if(err){
+                reject(err)
+            } else {
+                resolve()
+            }
+        })
+    })*/
+    const res = shell.moveItemToTrash(path.join(modsDir, fullName))
+    if(!res){
+        shell.beep()
+    }
+    return res
+}
+
+/**
+ * Toggle a discovered mod on or off. This is achieved by either 
+ * adding or disabling the .disabled extension to the local file.
+ * 
+ * @param {string} modsDir The path to the mods directory.
+ * @param {string} fullName The fullName of the discovered mod to toggle.
+ * @param {boolean} enable Whether to toggle on or off the mod.
+ * 
+ * @returns {Promise.<void>} A promise which resolves when the mod has
+ * been toggled. If an IO error occurs the promise will be rejected.
+ */
+exports.toggleDropinMod = function(modsDir, fullName, enable){
+    return new Promise((resolve, reject) => {
+        const oldPath = path.join(modsDir, fullName)
+        const newPath = path.join(modsDir, enable ? fullName.substring(0, fullName.indexOf(DISABLED_EXT)) : fullName + DISABLED_EXT)
+
+        fs.rename(oldPath, newPath, (err) => {
+            if(err){
+                reject(err)
+            } else {
+                resolve()
+            }
+        })
+    })
+}
+
+exports.isDropinModEnabled = function(fullName){
+    return !fullName.endsWith(DISABLED_EXT)
+}