Initial support for LDAP server authentication

Limitations as of this commit:

- tlsOptions can only be specified in config.json, not as env vars
- authentication failures are not yet gracefully handled by the UI
  - instead the error message is shown on a blank page (/auth/ldap)
- no email address is associated with the LDAP user's account
- no picture/profile URL is associated with the LDAP user's account
- we might have to generate our own access + refresh tokens,
  because we aren't using oauth. The currently generated
  tokens are just a placeholder.
- 'LDAP Sign in' needs to be translated to each locale

3 files changed, 46 insertions, 4 deletions

diff --git a/public/views/index.ejs b/public/views/index.ejs
index 2bec7de0..baca1417 100644
--- a/public/views/index.ejs
+++ b/public/views/index.ejs
@@ -57,7 +57,7 @@
                         <% if (errorMessage && errorMessage.length > 0) { %>
                         <div class="alert alert-danger" style="max-width: 400px; margin: 0 auto;"><%= errorMessage %></div>
                         <% } %>
-                        <% if(facebook || twitter || github || gitlab || dropbox || google || email) { %>
+                        <% if(facebook || twitter || github || gitlab || dropbox || google || ldap || email) { %>
                         <span class="ui-signin">
                             <br>
                             <a type="button" class="btn btn-lg btn-success ui-signin" data-toggle="modal" data-target=".signin-modal" style="min-width: 170px;"><%= __('Sign In') %></a>
@@ -93,7 +93,7 @@
                 </div>
 
                 <div id="history" class="section"<% if(!signin) { %> style="display:none;"<% } %>>
-                    <% if(facebook || twitter || github || gitlab || dropbox || google || email) { %>
+                    <% if(facebook || twitter || github || gitlab || dropbox || google || ldap || email) { %>
                     <div class="ui-signin">
                         <p><%= __('Below is the history from browser') %></p>
                     </div>
@@ -192,6 +192,7 @@
         </div>
     </div>
     <%- include signin-modal %>
+    <%- include signin-ldap-modal %>
 
     <% if(useCDN) { %>
     <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.1/jquery.min.js" integrity="sha256-hVVnYaiADRTO2PzUGmuLJr8BLUSjGIZsDYGmIJLv2b8=" crossorigin="anonymous"></script>
diff --git a/public/views/signin-ldap-modal.ejs b/public/views/signin-ldap-modal.ejs
new file mode 100644
index 00000000..6a665f17
--- /dev/null
+++ b/public/views/signin-ldap-modal.ejs
@@ -0,0 +1,35 @@
+<!-- signin ldap modal -->
+<div class="modal fade signin-ldap-modal" tabindex="-1" role="dialog" aria-labelledby="mySmallModalLabel" aria-hidden="true">
+    <div class="modal-dialog modal-sm">
+        <div class="modal-content">
+            <div class="modal-header">
+                <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span>
+                </button>
+                <h4 class="modal-title" id="mySmallModalLabel"><%= __('LDAP Sign in') %></h4>
+            </div>
+            <div class="modal-body" style="text-align: center;">
+                <% if(ldap) { %>
+                <form data-toggle="validator" role="form" class="form-horizontal" method="post" enctype="application/x-www-form-urlencoded">
+                    <div class="form-group">
+                        <div class="col-sm-12">
+                            <input type="username" class="form-control" name="username" placeholder="Username" required>
+                            <span class="help-block control-label with-errors" style="display: inline;"></span>
+                        </div>
+                    </div>
+                    <div class="form-group">
+                        <div class="col-sm-12">
+                            <input type="password" class="form-control" name="password" placeholder="Password" required>
+                            <span class="help-block control-label with_errors" style="display: inline;"></span>
+                        </div>
+                    </div>
+                    <div class="form-group">
+                        <div class="col-sm-12">
+                            <button type="submit" class="btn btn-primary" formaction="<%- url %>/auth/ldap">Sign in</button>
+                        </div>
+                    </div>
+                </form>
+                <% } %>
+            </div>
+        </div>
+    </div>
+</div>
diff --git a/public/views/signin-modal.ejs b/public/views/signin-modal.ejs
index acbad256..ba6c57ff 100644
--- a/public/views/signin-modal.ejs
+++ b/public/views/signin-modal.ejs
@@ -38,7 +38,13 @@
                     <i class="fa fa-google"></i> <%= __('Sign in via %s', 'Google') %>
                 </a>
                 <% } %>
-                <% if((facebook || twitter || github || gitlab || dropbox || google) && email) { %>
+                <% if(ldap) { %>
+                <a type="button" class="btn btn-lg btn-block btn-social btn-reddit "data-toggle="modal" data-target=".signin-ldap-modal">
+                    <i class="fa fa-book"></i> <%= __('Sign in via %s', 'LDAP') %>
+                </a>
+                <% } %>
+
+                <% if((facebook || twitter || github || gitlab || dropbox || google || ldap) && email) { %>
                 <hr>
                 <% }%>
                 <% if(email) { %>
@@ -67,4 +73,4 @@
             </div>
         </div>
     </div>
-</div>
\ No newline at end of file
+</div>