Bug 367480: [LDAP] Try a list of servers in order until we connect successfully

Bugzilla/Auth/Verify/LDAP.pm

@@ -37,6 +37,7 @@ use fields qw(
 
 use Bugzilla::Constants;
 use Bugzilla::Error;
+use Bugzilla::Util;
 
 use Net::LDAP;
 
@@ -134,11 +135,15 @@ sub ldap {
     my ($self) = @_;
     return $self->{ldap} if $self->{ldap};
 
-    my $server = Bugzilla->params->{"LDAPserver"};
-    ThrowCodeError("ldap_server_not_defined") unless $server;
+    my @servers = split(/[\s,]+]/, Bugzilla->params->{"LDAPserver"});
+    ThrowCodeError("ldap_server_not_defined") unless @servers;
 
-    $self->{ldap} = new Net::LDAP($server)
-        || ThrowCodeError("ldap_connect_failed", { server => $server });
+    foreach (@servers) {
+        $self->{ldap} = new Net::LDAP(trim($_));
+        last if $self->{ldap};
+    }
+    ThrowCodeError("ldap_connect_failed", { server => join(", ", @servers) }) 
+        unless $self->{ldap};
 
     # try to start TLS if needed
     if (Bugzilla->params->{"LDAPstarttls"}) {

template/en/default/admin/params/ldap.html.tmpl

@@ -30,7 +30,9 @@
                 "URI syntax can also be used, such as "_
                 "ldaps://ldap.company.com (for a secure connection) or " _
                 "ldapi://%2fvar%2flib%2fldap_sock (for a socket-based " _
-                "local connection.",
+                "local connection. Multiple hostnames or URIs can be comma " _
+                "separated; each will be tried in turn until a connection is " _
+                "established.",
 
   LDAPstartls => "Whether to require encrypted communication once normal " _
                  "LDAP connection achieved with the server.",

template/en/default/global/code-error.html.tmpl

@@ -279,7 +279,7 @@
     The specified LDAP attribute [% attr FILTER html %] was not found.
 
   [% ELSIF error == "ldap_connect_failed" %]
-    Could not connect to the LDAP server <code>[% server FILTER html %]</code>.
+    Could not connect to the LDAP server(s) <code>[% server FILTER html %]</code>.
 
   [% ELSIF error == "ldap_start_tls_failed" %]
     Could not start TLS with LDAP server: <code>[% error FILTER html %]</code>.