From cf0afeb957a9d74bd6f235514af79587414657af Mon Sep 17 00:00:00 2001
From: Daniel Scalzi <d_scalzi@yahoo.com>
Date: Fri, 28 Apr 2017 03:59:28 -0400
Subject: [PATCH] Began working on launching minecraft process. Implementing
 hash validation for asset downloads. Full integration for the latter will be
 complete soon.

---
 app/assets/js/assetdownload.js | 47 +++++++++++++++++++------
 app/assets/js/launchprocess.js | 64 ++++++++++++++++++++++++++++++++++
 index.js                       | 11 +++---
 package.json                   |  3 +-
 4 files changed, 108 insertions(+), 17 deletions(-)
 create mode 100644 app/assets/js/launchprocess.js

diff --git a/app/assets/js/assetdownload.js b/app/assets/js/assetdownload.js
index 61c1d2f..d640890 100644
--- a/app/assets/js/assetdownload.js
+++ b/app/assets/js/assetdownload.js
@@ -3,11 +3,13 @@ const request = require('request')
 const path = require('path')
 const mkpath = require('mkdirp');
 const async = require('async')
+const crypto = require('crypto')
 
-function Asset(from, to, size){
+function Asset(from, to, size, hash){
     this.from = from
     this.to = to
     this.size = size
+    this.hash = hash
 }
 
 function AssetIndex(id, sha1, size, url, totalSize){
@@ -213,22 +215,26 @@ exports.downloadAssets = function(versionData, basePath){
                 const hash = String(ob['hash'])
                 const assetName = path.join(hash.substring(0, 2), hash)
                 const urlName = hash.substring(0, 2) + "/" + hash
-                const ast = new Asset(resourceURL + urlName, path.join(objectPath, assetName), ob['size'])
+                const ast = new Asset(resourceURL + urlName, path.join(objectPath, assetName), ob['size'], hash)
                 assetArr.push(ast)
             })
             let acc = 0;
             async.eachLimit(assetArr, 5, function(asset, cb){
                 mkpath.sync(path.join(asset.to, ".."))
-                let req = request(asset.from)
-                let writeStream = fs.createWriteStream(asset.to)
-                req.pipe(writeStream)
-                req.on('data', function(chunk){
-                    acc += chunk.length
-                    //console.log('Progress', acc/datasize)
-                })
-                writeStream.on('close', function(){
+                if(!validateLocalIntegrity(asset.to, 'sha1', asset.hash)){
+                    let req = request(asset.from)
+                    let writeStream = fs.createWriteStream(asset.to)
+                    req.pipe(writeStream)
+                    req.on('data', function(chunk){
+                        acc += chunk.length
+                        //console.log('Progress', acc/datasize)
+                    })
+                    writeStream.on('close', function(){
+                        cb()
+                    })
+                } else {
                     cb()
-                })
+                }
             }, function(err){
                 if(err){
                     console.log('An asset failed to process');
@@ -238,4 +244,23 @@ exports.downloadAssets = function(versionData, basePath){
             })
         })
     })
+}
+
+validateLocalIntegrity = function(filePath, algo, hash){
+    if(fs.existsSync(filePath)){
+        let fileName = path.basename(filePath)
+        console.log('Validating integrity of local file', fileName)
+        let shasum = crypto.createHash(algo)
+        let content = fs.readFileSync(filePath)
+        shasum.update(content)
+        let localhash = shasum.digest('hex')
+        if(localhash === hash){
+            console.log('Hash value of ' + fileName + ' matches the index hash, woo!')
+            return true
+        } else {
+            console.log('Hash value of ' + fileName + ' (' + localhash + ')' + ' does not match the index hash. Redownloading..')
+            return false
+        }
+    }
+    return false;
 }
\ No newline at end of file
diff --git a/app/assets/js/launchprocess.js b/app/assets/js/launchprocess.js
new file mode 100644
index 0000000..7ac9eb6
--- /dev/null
+++ b/app/assets/js/launchprocess.js
@@ -0,0 +1,64 @@
+const mojang = require('mojang')
+const uuidV4 = require('uuid/v4')
+const path = require('path')
+const child_process = require('child_process')
+
+exports.launchMinecraft = function(versionData, basePath){
+    const authPromise = mojang.auth('EMAIL', 'PASS', uuidV4(), {
+        name: 'Minecraft',
+        version: 1
+    })
+    authPromise.then(function(data){
+        const hardcodedargs = ''
+        const args = finalizeArguments(versionData, data, basePath)
+        console.log(args)
+        const child = child_process.execFile(basePath)
+    })
+}
+
+finalizeArguments = function(versionData, authData, basePath){
+    const mcArgs = versionData['minecraftArguments']
+    const regex = new RegExp('\\${*(.*)}')
+    const argArr = mcArgs.split(' ')
+    for(let i=0; i<argArr.length; i++){
+        if(regex.test(argArr[i])){
+            const identifier = argArr[i].match(regex)[1]
+            //console.log(argArr[i].match(regex)[1])
+            let newVal = argArr[i]
+            switch(identifier){
+                case 'auth_player_name':
+                    //TODO make this DYNAMIC
+                    newVal = 'NAME'
+                    break
+                case 'version_name':
+                    newVal = versionData['id']
+                    break
+                case 'game_directory':
+                    newVal = basePath
+                    break
+                case 'assets_root':
+                    newVal = path.join(basePath, 'assets')
+                    break
+                case 'assets_index_name':
+                    newVal = versionData['assets']
+                    break
+                case 'auth_uuid':
+                    //TODO make this DYNAMIC
+                    newVal = 'UUID'
+                    break
+                case 'auth_access_token':
+                    newVal = authData['accessToken']
+                    break
+                case 'user_type':
+                    //TODO make this DYNAMIC
+                    newVal = 'MOJANG'
+                    break
+                case 'version_type':
+                    newVal = versionData['type']
+                    break
+            }
+            argArr[i] = newVal
+        }
+    }
+    return argArr.join(' ')
+}
\ No newline at end of file
diff --git a/index.js b/index.js
index d005a8c..48d55a1 100644
--- a/index.js
+++ b/index.js
@@ -18,15 +18,16 @@ function createWindow() {
     win.setMenu(null)
 
     //Code for testing, marked for removal one it's properly implemented.
-    /*const assetdl = require('./app/assets/js/assetdownload.js')
+    const assetdl = require('./app/assets/js/assetdownload.js')
     const basePath = path.join(__dirname, 'mcfiles')
     const dataPromise = assetdl.parseVersionData('1.11.2', basePath)
     dataPromise.then(function(data){
         assetdl.downloadAssets(data, basePath)
-        assetdl.downloadClient(data, basePath)
-        assetdl.downloadLogConfig(data, basePath)
-        assetdl.downloadLibraries(data, basePath)
-    })*/
+        //assetdl.downloadClient(data, basePath)
+        //assetdl.downloadLogConfig(data, basePath)
+        //assetdl.downloadLibraries(data, basePath)
+        //require('./app/assets/js/launchprocess.js').launchMinecraft(data, basePath)
+    })
 
     win.on('closed', () => {
         win = null
diff --git a/package.json b/package.json
index f30244c..a53333a 100644
--- a/package.json
+++ b/package.json
@@ -20,6 +20,7 @@
     "async": "^2.3.0",
     "electron": "^1.6.5",
     "mojang": "^0.4.0",
-    "promise": "^7.1.1"
+    "promise": "^7.1.1",
+    "uuid": "^3.0.1"
   }
 }