Enable alternative ways for settings passwords (#101)

* Enable alternative ways for settings passwords:
* the environment variable BW_PASSWORD
* prefix the command line argument with "file:" and the password will read from the first line of that file
* prefix the command line argument with "env:" and the password will be read from that environment variable

* Appveyor fixes

* Switch to using command options for password file and password env

* Lowercase options

src/cli/commands/login.command.ts

@@ -14,6 +14,8 @@ import { Response } from '../models/response';
 
 import { MessageResponse } from '../models/response/messageResponse';
 
+import { NodeUtils } from '../../misc/nodeUtils';
+
 export class LoginCommand {
     protected validatedParams: () => Promise<any>;
     protected success: () => Promise<MessageResponse>;
@@ -38,14 +40,21 @@ export class LoginCommand {
             return Response.badRequest('Email address is invalid.');
         }
 
-        if ((password == null || password === '') && canInteract) {
-            const answer: inquirer.Answers = await inquirer.createPromptModule({ output: process.stderr })({
-                type: 'password',
-                name: 'password',
-                message: 'Master password:',
-            });
-            password = answer.password;
+        if (password == null || password === '') {
+            if (cmd.passwordfile) {
+                password = await NodeUtils.readFirstLine(cmd.passwordfile);
+            } else if (cmd.passwordenv && process.env[cmd.passwordenv]) {
+                password = process.env[cmd.passwordenv];
+            } else if (canInteract) {
+                const answer: inquirer.Answers = await inquirer.createPromptModule({ output: process.stderr })({
+                    type: 'password',
+                    name: 'password',
+                    message: 'Master password:',
+                });
+                password = answer.password;
+            }
         }
+
         if (password == null || password === '') {
             return Response.badRequest('Master password is required.');
         }

src/misc/nodeUtils.ts

@@ -1,5 +1,6 @@
 import * as fs from 'fs';
 import * as path from 'path';
+import * as readline from 'readline';
 
 export class NodeUtils {
     static mkdirpSync(targetDir: string, mode = '700', relative = false, relativeDir: string = null) {
@@ -13,4 +14,16 @@ export class NodeUtils {
             return dir;
         }, initialDir);
     }
+    static readFirstLine(fileName: string) {
+        return new Promise<string>((resolve, reject) => {
+            const readStream = fs.createReadStream(fileName, {encoding: 'utf8'});
+            const readInterface = readline.createInterface(readStream);
+            readInterface
+                .on('line', (line) => {
+                    readStream.close();
+                    resolve(line);
+                })
+                .on('error', (err) => reject(err));
+        });
+    }
 }