Store the mailbox of all the owners

lib/metadata.js

@@ -55,6 +55,13 @@ commands.RM_OWNERS = function (meta, args) {
     args.forEach(function (owner) {
         var index = meta.owners.indexOf(owner);
         if (index < 0) { return; }
+        if (meta.mailbox) {
+            if (typeof(meta.mailbox) === "string") {
+                delete meta.mailbox;
+            } else {
+                delete meta.mailbox[owner];
+            }
+        }
         meta.owners.splice(index, 1);
         changed = true;
     });
@@ -131,6 +138,40 @@ commands.RESET_OWNERS = function (meta, args) {
     return true;
 };
 
+// ["ADD_MAILBOX", {"7eEqelGso3EBr5jHlei6av4r9w2B9XZiGGwA1EgZ-5I=": mailbox, ...}, 1561623439989]
+commands.ADD_MAILBOX = function (meta, args) {
+    // expect a new array, even if it's empty
+    if (!args || typeof(args) !== "object") {
+        throw new Error('METADATA_INVALID_MAILBOX');
+    }
+    // assume there are owners to start
+    if (!Array.isArray(meta.owners)) {
+        throw new Error("METADATA_NONSENSE_OWNERS");
+    }
+
+    var changed = false;
+
+    // For each mailbox we try to add, check if the associated edPublic is an owner
+    // If they are, add or replace the mailbox
+    Object.keys(args).forEach(function (edPublic) {
+        if (meta.owners.indexOf(edPublic) === -1) { return; }
+
+        if (typeof(meta.mailbox) === "string") {
+            var str = meta.mailbox;
+            meta.mailbox = {};
+            meta.mailbox[meta.owners[0]] = str;
+        }
+
+        // Make sure mailbox is defined
+        if (!meta.mailbox) { meta.mailbox = {}; }
+
+        meta.mailbox[edPublic] = args[edPublic];
+        changed = true;
+    });
+
+    return changed;
+};
+
 commands.UPDATE_EXPIRATION = function () {
     throw new Error("E_NOT_IMPLEMENTED");
 };