support to download specified versions of web3

Author: iurimatias

lib/core/config.js

@@ -1,6 +1,7 @@
 var fs = require('./fs.js');
 var Plugins = require('./plugins.js');
 var utils = require('../utils/utils.js');
+var npm = require('../pipeline/npm.js');
 
 // TODO: add wrapper for fs so it can also work in the browser
 // can work with both read and save
@@ -248,6 +249,13 @@ Config.prototype.loadFiles = function(files) {
 
       readFiles.push({filename: 'embark.js', content: fs.readFileSync(fs.embarkPath("js/build/embark.bundle.js")).toString(), path: fs.embarkPath("js/build/embark.bundle.js")});
     }
+    if (file.indexOf("web3-") == 0) {
+        let web3Version = file.split('web3-')[1].split(".js")[0];
+        npm.getPackageVersion('web3', web3Version, function(web3Content) {
+          self.logger.error('downloaded web3');
+          readFiles.push({filename: file, content: web3Content, path: fs.embarkPath("js/web3.js")});
+        });
+    }
   });
 
   // get plugins
@@ -280,6 +288,8 @@ Config.prototype.loadFiles = function(files) {
   originalFiles.filter(function(file) {
     if (file === 'embark.js') {
       return;
+    } else if (file.indexOf("web3-") === 0) {
+      return;
     } else if (file === 'abi.js') {
       readFiles.push({filename: file, content: "", path: file});
     } else {

lib/pipeline/npm.js

@@ -0,0 +1,34 @@
+let utils = require('../utils/utils.js');
+
+module.exports = {
+  // TODO: need to refactor to make it truly generalistic, perhaps by
+  // downloading the tarball itself
+  getPackageVersion: function(packageName, version, callback) {
+    let npmRegistry = "http://registry.npmjs.org/" + packageName + "/" + version;
+
+    utils.httpGet(npmRegistry, function (res) {
+
+      let body = '';
+      res.on('data', function (d) {
+        body += d;
+      });
+      res.on('end', function () {
+        let registryJSON = JSON.parse(body);
+        let gitHash = registryJSON.gitHead;
+        let repo = registryJSON.homepage.split("github.com/")[1];
+
+        let gitUrl = "http://raw.githubusercontent.com/" + repo + "/" + gitHash + "/dist/" + packageName + ".js"
+        utils.httpGet(gitUrl, function (res2) {
+          let body = '';
+          res2.on('data', function (d) {
+            body += d;
+          });
+          res2.on('end', function () {
+            callback(body);
+          });
+        });
+      });
+    });
+  }
+};
+

lib/utils/utils.js

@@ -2,7 +2,7 @@
 let path = require('path');
 let globule = require('globule');
 let merge = require('merge');
-let http = require('http');
+let http = require('follow-redirects').http;
 let shelljs = require('shelljs');
 
 function joinPath() {

package.json

@@ -24,6 +24,7 @@
     "commander": "^2.8.1",
     "ethereumjs-testrpc": "3.9.2",
     "finalhandler": "^0.5.0",
+    "follow-redirects": "^1.2.4",
     "fs-extra": "^2.0.0",
     "globule": "^1.1.0",
     "merge": "^1.2.0",

test_app/embark.json

@@ -10,7 +10,8 @@
     "js/mytoken.js": ["$MyToken", "app/js/token_test.js"],
     "index.html": "app/index.html",
     "test.html": "app/test.html",
-    "test2.html": "app/test2.html"
+    "test2.html": "app/test2.html",
+    "js/myweb3.js": "web3-0.18.js"
   },
   "buildDir": "dist/",
   "config": "config/",