Add action to download forms from google drive

Closes #3

package.json

@@ -1,6 +1,6 @@
 {
   "name": "medic-conf",
-  "version": "1.7.8",
+  "version": "1.8.0",
   "description": "Configure Medic Mobile deployments",
   "main": "index.js",
   "scripts": {
@@ -27,6 +27,7 @@
   "dependencies": {
     "canonical-json": "0.0.4",
     "csv-parse": "^1.2.4",
+    "googleapis": "^22.2.0",
     "mkdirp": "^0.5.1",
     "pouchdb-adapter-http": "^6.3.4",
     "pouchdb-core": "^6.3.4",

src/cli/supported-actions.js

@@ -9,6 +9,7 @@ module.exports = [
   'convert-contact-forms',
   'csv-to-docs',
   'delete-all-forms',
+  'fetch-forms-from-google-drive',
   'initialise-project-layout',
   'upload-app-forms',
   'upload-app-settings',

src/fn/fetch-forms-from-google-drive.js

@@ -0,0 +1,49 @@
+const fs = require('../lib/sync-fs');
+const google = require('googleapis');
+const googleAuth = require('../lib/google-auth');
+const info = require('../lib/log').info;
+
+module.exports = projectDir => {
+  return googleAuth()
+    .then(auth => {
+      const drive = google.drive({
+        version: 'v3',
+        auth: auth,
+      });
+
+      const forms = fs.readJson(`${projectDir}/forms-on-google-drive.json`);
+
+      return Object.keys(forms)
+        .reduce(fetchForm, Promise.resolve());
+
+      function fetchForm(promiseChain, localName) {
+        return promiseChain
+          .then(() => new Promise((resolve, reject) => {
+            const remoteName = forms[localName];
+
+            const fetchOpts = {
+              auth: auth,
+              fileId: forms[localName],
+              mimeType: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
+            };
+
+            const formDir = 'forms';
+            fs.mkdir(formDir);
+            const target = `${formDir}/${localName}`;
+
+            info(`Exporting ${remoteName} from google drive to ${target}…`);
+
+            drive.files.export(fetchOpts, (err, buffer) => {
+              if(err) return reject(err);
+              try {
+                fs.writeBinary(target, buffer);
+                info(`Successfully wrote ${target}.`);
+                resolve();
+              } catch(e) {
+                reject(e);
+              }
+            });
+          }));
+      }
+    });
+};

src/lib/google-auth.js

@@ -0,0 +1,65 @@
+const child_process = require('child_process');
+const fs = require('../lib/sync-fs');
+const google = require('googleapis');
+const info = require('../lib/log').info;
+const readline = require('readline-sync');
+const warn = require('../lib/log').warn;
+
+const SECRETS_FILE = './.gdrive.secrets.json';
+
+module.exports = () => {
+  const client = oauthClient();
+
+  const authUrl = client.generateAuthUrl({
+    scope: 'https://www.googleapis.com/auth/drive.readonly'
+  });
+
+  openBrowserAt(authUrl);
+  const accessCode = readline.question(`Enter access code from browser: `);
+
+  return new Promise((resolve, reject) => {
+    client.getToken(accessCode, function (err, tokens) {
+      if(err) return reject(err);
+
+      client.setCredentials(tokens);
+
+      resolve(client);
+    });
+  });
+};
+
+function oauthClient() {
+  let configFile;
+  try {
+    configFile = fs.readJson(SECRETS_FILE);
+  } catch(e) {
+    info('Failed to load google drive secrets from file.', e);
+    configFile = {};
+  }
+
+  const clientId = process.env.GOOGLE_CLIENT_ID || configFile.client_id;
+  const clientSecret = process.env.GOOGLE_CLIENT_SECRET || configFile.client_secret;
+  const redirectUri = process.env.GOOGLE_REDIRECT_URI ||
+      (configFile.redirect_uris && configFile.redirect_uris[0]);
+
+  const missingConfig =
+      checkRequred(clientId, 'client_id', 'GOOGLE_CLIENT_ID') |
+      checkRequred(clientSecret, 'client_secret', 'GOOGLE_CLIENT_SECRET') |
+      checkRequred(redirectUri, 'redirect_uris', 'GOOGLE_REDIRECT_URI');
+
+  if(missingConfig) throw new Error('Missing required config for google drive access.  Please check warnings.');
+
+  return new google.auth.OAuth2(clientId, clientSecret, redirectUri);
+}
+
+function openBrowserAt(url) {
+  info(`Should open browser at: ${url}`);
+  child_process.exec(`open "${url}" || firefox "${url}" || chromium-browser "${url}" || chrome "${url}"`);
+}
+
+function checkRequred(value, jsonKey, envVar) {
+  if(value) return;
+
+  warn(`Missing .${jsonKey} in ${SECRETS_FILE} or env var ${envVar}!`);
+  return true;
+}

test/bin/shell-completion.spec.js

@@ -25,6 +25,7 @@ describe('shell-completion', () => {
         'convert-contact-forms',
         'csv-to-docs',
         'delete-all-forms',
+        'fetch-forms-from-google-drive',
         'initialise-project-layout',
         'upload-app-forms',
         'upload-app-settings',