From 618298b1d9a5c6acc3b4f8a094c38368f9f4cf80 Mon Sep 17 00:00:00 2001
From: Trumeet <yuuta@yuuta.moe>
Date: Sun, 4 Apr 2021 14:24:09 -0700
Subject: fix(central): does not allow peers with the same link local addresses
 with nodes Existing conflicts need to be removed manually

---
 .../src/main/java/moe/yuuta/dn42peering/manage/ManagementUI.java    | 6 ++++++
 central/src/main/resources/manage/form.ftlh                         | 2 +-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/central/src/main/java/moe/yuuta/dn42peering/manage/ManagementUI.java b/central/src/main/java/moe/yuuta/dn42peering/manage/ManagementUI.java
index 4f9954b..e77d0ed 100644
--- a/central/src/main/java/moe/yuuta/dn42peering/manage/ManagementUI.java
+++ b/central/src/main/java/moe/yuuta/dn42peering/manage/ManagementUI.java
@@ -103,6 +103,7 @@ class ManagementUI {
                         root.put("mpbgp", false);
                         root.put("node_checked", ((List<Map<String, Object>>)root.get("nodes")).get(0).get("id"));
                     }
+                    root.put("ipv6_placeholder", "fe80::" + asn.substring(asn.length() - 4));
                     if(!newForm && peer != null)
                         root.put("action", "/manage/edit?id=" + peer.getId());
                     else
@@ -279,6 +280,11 @@ class ManagementUI {
                                         !address.isLinkLocal()) {
                                     errors.add("IPv6 address is illegal. It must be a dn42 or link-local IPv6 address.");
                                 }
+                                if(node != null &&
+                                        address.isLinkLocal() &&
+                                        ipv6.equalsIgnoreCase(node.getDn42Ip6())) {
+                                    errors.add("Your IPv6 link local address must not be the same with ours. (Pick a different one)");
+                                }
                             } else
                                 errors.add("IPv6 address is illegal. Cannot parse your address.");
                         } else {
diff --git a/central/src/main/resources/manage/form.ftlh b/central/src/main/resources/manage/form.ftlh
index 021f26c..c407a9b 100644
--- a/central/src/main/resources/manage/form.ftlh
+++ b/central/src/main/resources/manage/form.ftlh
@@ -17,7 +17,7 @@
     <br />
     <label for="ipv6">dn42 or link local IPv6 Address (Optional):</label><br />
     <input type="text" id="ipv6" name="ipv6"
-           placeholder="fe80::2980"
+           placeholder="${ipv6_placeholder}"
            value="${(ipv6)!}"><br />
     <br />
     <input type="checkbox" id="mpbgp" name="mpbgp" value="mpbgp" ${mpbgp?string('checked', '')}>
-- 
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