Invites can now be managed to some extent

app/imports/api/users/Invites.js

@@ -15,6 +15,7 @@ let InviteSchema = new SimpleSchema({
     regEx: SimpleSchema.RegEx.Id,
     optional: true,
     index: 1,
+    unique: 1,
   },
   inviteToken: {
     type: String,
@@ -25,10 +26,6 @@ let InviteSchema = new SimpleSchema({
   isFunded: {
     type: Boolean,
   },
-  isRedundant: {
-    type: Boolean,
-    optional: true,
-  },
   // The timestamp of when the invitee was confirmed
   // Older invites have priority over newer ones
   dateConfirmed: {
@@ -119,14 +116,15 @@ const acceptInviteToken = new ValidatedMethod({
     },
   }).validator(),
   run({inviteToken}) {
-    if (this.userId) {
+    if (!this.userId) {
       throw new Meteor.Error('Invites.methods.acceptToken.denied',
       'You need to be the logged in to accept a token');
     }
+    if (Meteor.isClient) return;
     let invite = Invites.findOne({inviteToken});
     if (!invite){
       throw new Meteor.Error('Invites.methods.acceptToken.notFound',
-      'No invite could be found for this token');
+      'No invite could be found for this link, maybe it has already been claimed');
     }
     // If the invitee is already filled, fix unexpected case by deleting the token
     if (invite.invitee){
@@ -134,7 +132,7 @@ const acceptInviteToken = new ValidatedMethod({
         $unset: {inviteToken: 1}
       });
       throw new Meteor.Error('Invites.methods.acceptToken.alreadyAccepted',
-      'This invite already has an invitee, and shouldn\'t have a token');
+      'This invite has already been claimed');
     }
     if (this.userId === invite.inviter){
       throw new Meteor.Error('Invites.methods.acceptToken.ownToken',