Properly extract package name for installing tgz of scoped packages (f…

…acebook#1706)

* Properly extract package name

* Download package if need be ...

* Oops

* Add e2e test based on facebook#1537, but without specific filename

* Pass packageName through promises

A little bit more verbose but explicit and doesn't rely on shared mutable state.

* Fix up directory name in test

* Tweak failure message

* Fix lint

# Conflicts:
#   packages/create-react-cy-app/index.js

packages/create-react-cy-app/index.js

@@ -60,6 +60,9 @@ var execSync = require('child_process').execSync;
 var spawn = require('cross-spawn');
 var semver = require('semver');
 var dns = require('dns');
+var tmp = require('tmp');
+var unpack = require('tar-pack').unpack;
+var hyperquest = require('hyperquest');
 
 var projectName;
 
@@ -201,23 +204,34 @@ function install(useYarn, dependencies, verbose, isOnline) {
 
 function run(root, appName, version, verbose, originalDirectory, template) {
   var packageToInstall = getInstallPackage(version);
-  var packageName = getPackageName(packageToInstall);
-
   var allDependencies = ['react', 'react-dom', packageToInstall];
 
   console.log('Installing packages. This might take a couple minutes.');
-  console.log(
-    'Installing ' + chalk.cyan('react') + ', ' + chalk.cyan('react-dom') +
-    ', and ' + chalk.cyan(packageName) + '...'
-  );
-  console.log();
-
+
   var useYarn = shouldUseYarn();
-  checkIfOnline(useYarn)
-    .then(function(isOnline) {
-      return install(useYarn, allDependencies, verbose, isOnline);
+  getPackageName(packageToInstall)
+    .then(function(packageName) {
+      return checkIfOnline(useYarn).then(function(isOnline) {
+        return {
+          isOnline: isOnline,
+          packageName: packageName,
+        };
+      });
+    })
+    .then(function(info) {
+      var isOnline = info.isOnline;
+      var packageName = info.packageName;
+      console.log(
+        'Installing ' + chalk.cyan('react') + ', ' + chalk.cyan('react-dom') +
+        ', and ' + chalk.cyan(packageName) + '...'
+      );
+      console.log();
+
+      return install(useYarn, allDependencies, verbose, isOnline).then(function() {
+        return packageName;
+      });
     })
-    .then(function() {
+    .then(function(packageName) {
       checkNodeVersion(packageName);
 
       // Since react-scripts has been installed with --save
@@ -285,22 +299,77 @@ function getInstallPackage(version) {
   return packageToInstall;
 }
 
+function getTemporaryDirectory() {
+  return new Promise(function(resolve, reject) {
+    // Unsafe cleanup lets us recursively delete the directory if it contains
+    // contents; by default it only allows removal if it's empty
+    tmp.dir({ unsafeCleanup: true }, function(err, tmpdir, callback) {
+      if (err) {
+        reject(err);
+      } else {
+        resolve({
+          tmpdir: tmpdir,
+          cleanup: function() {
+            try {
+              callback();
+            } catch (ignored) {
+              // Callback might throw and fail, since it's a temp directory the
+              // OS will clean it up eventually...
+            }
+          }
+        });
+      }
+    });
+  });
+}
+
+function extractStream(stream, dest) {
+  return new Promise(function(resolve, reject) {
+    stream.pipe(unpack(dest, function(err) {
+      if (err) {
+        reject(err);
+      } else {
+        resolve(dest);
+      }
+    }));
+  });
+}
+
 // Extract package name from tarball url or path.
 function getPackageName(installPackage) {
   if (installPackage.indexOf('.tgz') > -1) {
-    // The package name could be with or without semver version, e.g. react-cy-scripts-0.2.0-alpha.1.tgz
-    // However, this function returns package name only without semver version.
-    return installPackage.match(/^.+\/(.+?)(?:-\d+.+)?\.tgz$/)[1];
+    return getTemporaryDirectory().then(function(obj) {
+      var stream;
+      if (/^http/.test(installPackage)) {
+        stream = hyperquest(installPackage);
+      } else {
+        stream = fs.createReadStream(installPackage);
+      }
+      return extractStream(stream, obj.tmpdir).then(function() {
+        return obj;
+      });
+    }).then(function(obj) {
+      var packageName = require(path.join(obj.tmpdir, 'package.json')).name;
+      obj.cleanup();
+      return packageName;
+    }).catch(function(err) {
+      // The package name could be with or without semver version, e.g. react-scripts-0.2.0-alpha.1.tgz
+      // However, this function returns package name only without semver version.
+      console.log('Could not extract the package name from the archive: ' + err.message);
+      var assumedProjectName = installPackage.match(/^.+\/(.+?)(?:-\d+.+)?\.tgz$/)[1];
+      console.log('Based on the filename, assuming it is "' + chalk.cyan(assumedProjectName) + '"');
+      return Promise.resolve(assumedProjectName);
+    });
   } else if (installPackage.indexOf('git+') === 0) {
     // Pull package name out of git urls e.g:
     // git+https://github.com/mycompany/react-scripts.git
     // git+ssh://github.com/mycompany/react-scripts.git#v1.2.3
-    return installPackage.match(/([^\/]+)\.git(#.*)?$/)[1];
+    return Promise.resolve(installPackage.match(/([^\/]+)\.git(#.*)?$/)[1]);
   } else if (installPackage.indexOf('@') > 0) {
     // Do not match @scope/ when stripping off @version or @tag
-    return installPackage.charAt(0) + installPackage.substr(1).split('@')[0];
+    return Promise.resolve(installPackage.charAt(0) + installPackage.substr(1).split('@')[0]);
   }
-  return installPackage;
+  return Promise.resolve(installPackage);
 }
 
 function checkNpmVersion() {
@@ -356,7 +425,7 @@ function checkAppName(appName) {
     printValidationResults(validationResult.warnings);
     process.exit(1);
   }
-  
+
   // TODO: there should be a single place that holds the dependencies
   // Currently we have to manually include eslint as a dep because otherwise text editors don't pick it up.
   var dependencies = ['react', 'react-dom', 'eslint', 'eslint-config-codeyellow', 'mobx'];
@@ -450,7 +519,7 @@ function checkIfOnline(useYarn) {
     // We'll just assume the best case.
     return Promise.resolve(true);
   }
-  
+
   return new Promise(function(resolve) {
     dns.resolve('registry.yarnpkg.com', function(err) {
       resolve(err === null);

packages/create-react-cy-app/package.json

@@ -24,7 +24,10 @@
     "commander": "^2.9.0",
     "cross-spawn": "^4.0.0",
     "fs-extra": "^1.0.0",
+    "hyperquest": "^2.1.2",
     "semver": "^5.0.3",
+    "tar-pack": "^3.4.0",
+    "tmp": "0.0.31",
     "validate-npm-package-name": "^3.0.0"
   }
 }