Patch against serverless-azure-functions to use credentials from ~/.azure/accessTokens.json

serverless-azure-functions-auth.patch

diff -ur a/node_modules/serverless-azure-functions/provider/azureProvider.js b/node_modules/serverless-azure-functions/provider/azureProvider.js
--- a/node_modules/serverless-azure-functions/provider/azureProvider.js	2018-10-09 11:53:42.151689784 +0200
+++ b/node_modules/serverless-azure-functions/provider/azureProvider.js	2018-10-09 13:18:20.771792944 +0200
@@ -5,6 +5,8 @@
 const resourceManagement = require('azure-arm-resource');
 const path = require('path');
 const fs = require('fs');
+const os = require('os');
+const msRestAzure = require('ms-rest-azure');
 const request = require('request');
 const dns = require('dns');
 const jsonpath = require('jsonpath');
@@ -21,6 +23,7 @@
 let functionsAdminKey;
 let invocationId;
 let principalCredentials;
+let accessToken;
 let existingFunctionApp = false;
 const deployedFunctionNames = [];
 
@@ -58,19 +61,64 @@
   }
 
   Login() {
-    return login({ interactiveLoginHandler: (code, message) => {
-      // Override the interactive login handler, in order to be
-      // able to append the Serverless prefix to the displayed message.
-      this.serverless.cli.log(message);
-    }}).then((result) => {
-      principalCredentials = result.credentials;
-      subscriptionId = result.subscriptionId;
-
-      return principalCredentials;
-    }).catch((error) => {
-      error.message = error.message || (error.body ? error.body.message : 'Failed logging in to Azure');
-      throw error;
+    const tokens = new Promise((resolve, reject) => {
+      fs.readFile(path.join(os.homedir(), '.azure/accessTokens.json'), { encoding: 'utf8' }, (err, data) => {
+        if (err) {
+          return reject(err);
+        }
+
+        const tokens = JSON.parse(data.replace(/^\uFEFF/, ''));
+        if (typeof tokens !== 'object') {
+          return reject('Unable to parse JSON payload of accessTokens.json');
+        }
+
+        resolve(_.map(tokens, x => { x.expiresOn = new Date(x.expiresOn); return x; }));
+      });
     });
+
+    const profile = new Promise((resolve, reject) => {
+      fs.readFile(path.join(os.homedir(), '.azure/azureProfile.json'), { encoding: 'utf8' }, (err, data) => {
+        if (err) {
+          return reject(err);
+        }
+
+        const profile = JSON.parse(data.replace(/^\uFEFF/, ''));
+        if (typeof profile !== 'object') {
+          return reject('Unable to parse JSON payload of azureProfile.json');
+        }
+
+        resolve(profile);
+      });
+    });
+
+    return Promise.all([ tokens, profile ])
+      .then(([tokens, profile]) => {
+        const defaultSubscriptions = _.filter(profile.subscriptions, x => x.isDefault);
+
+        if (defaultSubscriptions.length === 0) {
+          return Promise.reject('No default subscription');
+        }
+
+        if (tokens.length === 0) {
+          return Promise.reject('No tokens found');
+        }
+
+        const username = tokens[0].userId;
+
+        subscriptionId = defaultSubscriptions[0].id;
+        principalCredentials = new msRestAzure.DeviceTokenCredentials({ username });
+        principalCredentials.tokenCache.add(tokens, () => true);
+
+        return new Promise((resolve, reject) => {
+          principalCredentials.getToken((err, result) => {
+            if (err) {
+              return reject(err);
+            }
+            accessToken = result.accessToken;
+            resolve();
+          });
+        });
+      });
   }
 
   CreateResourceGroup () {
@@ -203,7 +251,7 @@
       url: `https://${functionAppName}${config.scmDomain}${config.masterKeyApiPath}`,
       json: true,
       headers: {
-        Authorization: config.bearer + principalCredentials.tokenCache._entries[0].accessToken
+        Authorization: config.bearer + accessToken
       }
     };
 
@@ -274,7 +322,7 @@
       url: requestUrl,
       json: true,
       headers: {
-        Authorization: config.bearer + principalCredentials.tokenCache._entries[0].accessToken,
+        Authorization: config.bearer + accessToken,
         Accept: 'application/json,*/*'
       }
     };
@@ -309,7 +357,7 @@
     const logOptions = {
       url: `https://${functionAppName}${config.scmDomain}${config.logStreamApiPath}${functionName}`,
       headers: {
-        Authorization: config.bearer + principalCredentials.tokenCache._entries[0].accessToken,
+        Authorization: config.bearer + accessToken,
         Accept: '*/*'
       }
     };
@@ -329,7 +377,7 @@
       method: 'GET',
       json: true,
       headers: {
-        Authorization: config.bearer + principalCredentials.tokenCache._entries[0].accessToken
+        Authorization: config.bearer + accessToken
       }
     };
 
@@ -352,7 +400,7 @@
       method: 'GET',
       json: true,
       headers: {
-        Authorization: config.bearer + principalCredentials.tokenCache._entries[0].accessToken
+        Authorization: config.bearer + accessToken
       }
     };
 
@@ -446,7 +494,7 @@
       url: requestUrl,
       json: true,
       headers: {
-        Authorization: config.bearer + principalCredentials.tokenCache._entries[0].accessToken,
+        Authorization: config.bearer + accessToken,
         'Accept': 'application/json,*/*'
       }
     };
@@ -477,7 +525,7 @@
       url: requestUrl,
       json: true,
       headers: {
-        Authorization: config.bearer + principalCredentials.tokenCache._entries[0].accessToken,
+        Authorization: config.bearer + accessToken,
         Accept: 'application/json'
       }
     };
@@ -521,7 +569,7 @@
       url: requestUrl,
       json: true,
       headers: {
-        Authorization: config.bearer + principalCredentials.tokenCache._entries[0].accessToken,
+        Authorization: config.bearer + accessToken,
         Accept: '*/*'
       }
     };
@@ -548,7 +596,7 @@
       url: requestUrl,
       json: true,
       headers: {
-        Authorization: config.bearer + principalCredentials.tokenCache._entries[0].accessToken,
+        Authorization: config.bearer + accessToken,
         Accept: '*/*'
       }
     };
@@ -598,7 +646,7 @@
       const options = {
         url: requestUrl,
         headers: {
-          Authorization: config.bearer + principalCredentials.tokenCache._entries[0].accessToken,
+          Authorization: config.bearer + accessToken,
           Accept: '*/*'
         }
       };