[local-sync, iso-core] feat(send): Support basic sending for gmail accounts

packages/isomorphic-core/src/models/account.js

@@ -79,17 +79,34 @@ module.exports = (sequelize, Sequelize) => {
       },
 
       smtpConfig() {
-        if (this.provider !== "imap") {
-          throw new Error("Non IMAP not yet supported")
-        }
-
-        const {smtp_username, smtp_password} = this.decryptedCredentials();
         const {smtp_host, smtp_port, ssl_required} = this.connectionSettings;
-
-        return {
-          port: smtp_port, host: smtp_host, secure: ssl_required,
-          auth: { user: smtp_username, pass: smtp_password},
+        const config = {
+          host: smtp_host,
+          port: smtp_port,
+          secure: ssl_required,
         }
+
+        if (this.provider === "imap") {
+          const {smtp_username, smtp_password} = this.decryptedCredentials();
+          config.auth = { user: smtp_username, pass: smtp_password}
+        } else if (this.provider === 'gmail') {
+          const {xoauth2} = this.decryptedCredentials();
+          const {imap_username} = this.connectionSettings;
+
+          // We have to unpack the access token from the entire XOAuth2
+          // token because it is re-packed during the SMTP connection login.
+          // https://github.com/nodemailer/smtp-connection/blob/master/lib/smtp-connection.js#L1418
+          const bearer = "Bearer ";
+          const decoded = atob(xoauth2);
+          const tokenIndex = decoded.indexOf(bearer) + bearer.length;
+          const token = decoded.substring(tokenIndex, decoded.length - 2);
+
+          config.auth = { user: imap_username, xoauth2: token }
+        } else {
+          throw new Error(`${this.provider} not yet supported`)
+        }
+
+        return config;
       },
 
       supportsLabels() {

packages/local-sync/src/local-api/routes/auth.js

@@ -119,6 +119,9 @@ module.exports = (server) => {
           imap_username: email,
           imap_host: 'imap.gmail.com',
           imap_port: 993,
+          smtp_username: email,
+          smtp_host: 'smtp.gmail.com',
+          smtp_port: 465,
           ssl_required: true,
         }
         connectionCredentials = {