From 3c6ee0ce62ebde6b641cf82981d30b1aacd3ab2d Mon Sep 17 00:00:00 2001
From: Rezart Qelibari <it@astzweig.de>
Date: Fri, 10 May 2019 02:04:45 +0200
Subject: [PATCH 1/2] Allow forward-partial wildcard addresses
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Enables recognition of forward-partial wildcard addresses à la
'*postfix@domain.com'.
---
 lib/tools.js        | 20 ++++++++++++++++++++
 lib/user-handler.js | 13 +++++++++++--
 2 files changed, 31 insertions(+), 2 deletions(-)

diff --git a/lib/tools.js b/lib/tools.js
index aca38934..c25025ae 100644
--- a/lib/tools.js
+++ b/lib/tools.js
@@ -108,6 +108,25 @@ function normalizeAddress(address, withNames, options) {
     return addr;
 }
 
+/**
+ * Generate a list of possible wildcard addresses by generating all posible
+ * substrings of the username email address part.
+ *
+ * @param {String} username - The username part of the email address.
+ * @param {String} domain - The domain part of the email address.
+ * @return {Array} The list of all possible username wildcard addresses,
+ *   that would match this email address (as given by the params).
+ */
+function getWildcardAddresses(username, domain) {
+  if (typeof username !== 'string' || typeof domain !== 'string') return [];
+  let result = [];
+  // <= generates the 'simple' wildcard (a la '*@') address.
+  for (var i = 1; i <= username.length; i++) {
+    result.push('*' + username.substr(i) + '@' + domain);
+  }
+  return result;
+}
+
 // returns a redis config object with a retry strategy
 function redisConfig(defaultConfig) {
     return defaultConfig;
@@ -430,6 +449,7 @@ function uview(address) {
 module.exports = {
     normalizeAddress,
     normalizeDomain,
+    getWildcardAddresses,
     redisConfig,
     checkRangeQuery,
     decodeAddresses,
diff --git a/lib/user-handler.js b/lib/user-handler.js
index 0afe87d9..37ce6a6e 100644
--- a/lib/user-handler.js
+++ b/lib/user-handler.js
@@ -121,13 +121,22 @@ class UserHandler {
                 return false;
             }
 
+            let _partialWildcards = tools.getWildcardAddresses(
+              username,
+              domain
+            );
+
             let query = {
-                addrview: '*@' + domain
+                addrview: { $in: _partialWildcards }
             };
 
             if (aliasDomain) {
                 // search for alias domain as well
-                query.addrview = { $in: [query.addrview, '*@' + aliasDomain] };
+                let _aliasWildcards = tools.getWildcardAddresses(
+                  username,
+                  aliasDomain
+                );
+                query.addrview['$in'] = query.addrview['$in'].concat(_aliasWildcards);
             }
 
             // try to find a catch-all address

From a6390611ef8fb19156d37f2d16d024401ad46201 Mon Sep 17 00:00:00 2001
From: Rezart Qelibari <it@astzweig.de>
Date: Fri, 10 May 2019 05:20:30 +0200
Subject: [PATCH 2/2] Fix two linting errors

---
 lib/tools.js        | 2 +-
 lib/user-handler.js | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/tools.js b/lib/tools.js
index c25025ae..13b848af 100644
--- a/lib/tools.js
+++ b/lib/tools.js
@@ -121,7 +121,7 @@ function getWildcardAddresses(username, domain) {
   if (typeof username !== 'string' || typeof domain !== 'string') return [];
   let result = [];
   // <= generates the 'simple' wildcard (a la '*@') address.
-  for (var i = 1; i <= username.length; i++) {
+  for (let i = 1; i <= username.length; i++) {
     result.push('*' + username.substr(i) + '@' + domain);
   }
   return result;
diff --git a/lib/user-handler.js b/lib/user-handler.js
index 37ce6a6e..1120ec49 100644
--- a/lib/user-handler.js
+++ b/lib/user-handler.js
@@ -136,7 +136,7 @@ class UserHandler {
                   username,
                   aliasDomain
                 );
-                query.addrview['$in'] = query.addrview['$in'].concat(_aliasWildcards);
+                query.addrview.$in = query.addrview.$in.concat(_aliasWildcards);
             }
 
             // try to find a catch-all address