HDFS-7995. Implement chmod in the HDFS Web UI. Contributed by Ravi Prakash and Haohui Mai.

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -578,6 +578,9 @@ Release 2.8.0 - UNRELEASED
     HDFS-7986. Allow files / directories to be deleted from the NameNode UI.
     (Ravi Prakash via wheat9)
 
+    HDFS-7995. Implement chmod in the HDFS Web UI.
+    (Ravi Prakash and Haohui Mai via wheat9)
+
   OPTIMIZATIONS
 
     HDFS-8026. Trace FSOutputSummer#writeChecksumChunks rather than

hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/hdfs/explorer.html

@@ -87,7 +87,6 @@
 	<button type="button" class="close" onclick="$('#alert-panel').hide();">&times;</button>
 	<div class="alert-body" id="alert-panel-body"></div>
       </div>
-
     <div class="modal" id="btn-create-directory" tabindex="-1" role="dialog"
       aria-hidden="true">
       <div class="modal-dialog">
@@ -169,6 +168,46 @@
 
     </div>
 
+    <script type="text/x-template" id="explorer-popover-perm-info">
+      <div class="explorer-popover-perm-body">
+        <table class="table table-striped">
+          <thead>
+            <tr>
+              <th class="text-center">User</th>
+              <th class="text-center">Group</th>
+              <th class="text-center">Other</th>
+            </tr>
+          </thead>
+          <tbody>
+            <tr>
+              <td><label><input type="checkbox" data-bit="8" /> Read</label></td>
+              <td><label><input type="checkbox" data-bit="5" /> Read</label></td>
+              <td><label><input type="checkbox" data-bit="2" /> Read</label></td>
+            </tr>
+            <tr>
+              <td><label><input type="checkbox" data-bit="7" /> Write</label></td>
+              <td><label><input type="checkbox" data-bit="4" /> Write</label></td>
+              <td><label><input type="checkbox" data-bit="1" /> Write</label></td>
+            </tr>
+            <tr>
+              <td><label><input type="checkbox" data-bit="6" /> Execute</label></td>
+              <td><label><input type="checkbox" data-bit="3" /> Execute</label></td>
+              <td><label><input type="checkbox" data-bit="0" /> Execute</label></td>
+            </tr>
+          </tbody>
+        </table>
+        <div style="text-align: right; margin-right: 10px">
+          <label><input type="checkbox" id="explorer-perm-sticky" data-bit="9" /> Sticky bit</label>
+        </div>
+        <hr/>
+        <div style="text-align: right">
+          <button type="button" class="btn" id="explorer-perm-cancel">Cancel</button>
+          <button type="button" class="btn btn-success" id="explorer-set-perm-button"
+                  data-complete-text="Updating...">Set</button>
+        </div>
+      </div>
+    </script>
+
     <script type="text/x-dust-template" id="tmpl-explorer">
       <table class="table">
         <thead>
@@ -181,13 +220,17 @@
             <th>Replication</th>
             <th>Block Size</th>
             <th>Name</th>
-            <th>Delete</th>
+            <th></th>
           </tr>
         </thead>
         <tbody>
           {#FileStatus}
-          <tr inode-path="{pathSuffix}" class="explorer-entry">
-            <td>{type|helper_to_directory}{permission|helper_to_permission}{aclBit|helper_to_acl_bit}</td>
+          <tr inode-path="{pathSuffix}" data-permission="{permission}"
+            class="explorer-entry">
+            <td><span class="explorer-perm-links editable-click">
+              {type|helper_to_directory}{permission|helper_to_permission}
+              {aclBit|helper_to_acl_bit}
+              </span></td>
             <td>{owner}</td>
             <td>{group}</td>
             <td>{length|fmt_bytes}</td>

hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/hdfs/explorer.js

@@ -22,6 +22,7 @@
   // in the preview.
   var TAIL_CHUNK_SIZE = 32768;
 
+  //This stores the current directory which is being browsed
   var current_directory = "";
 
   function show_err_msg(msg) {
@@ -101,6 +102,50 @@
     $('#delete-modal').modal();
   }
 
+  /* This method loads the checkboxes on the permission info modal. It accepts
+   * the octal permissions, eg. '644' or '755' and infers the checkboxes that
+   * should be true and false
+   */
+  function view_perm_details(e, filename, abs_path, perms) {
+    $('.explorer-perm-links').popover('destroy');
+    e.popover({html: true, content: $('#explorer-popover-perm-info').html(), trigger: 'focus'})
+      .on('shown.bs.popover', function(e) {
+        var popover = $(this), parent = popover.parent();
+        //Convert octal to binary permissions
+        var bin_perms = parseInt(perms, 8).toString(2);
+        bin_perms = bin_perms.length == 9 ? "0" + bin_perms : bin_perms;
+        parent.find('#explorer-perm-cancel').on('click', function() { popover.popover('destroy'); });
+        parent.find('#explorer-set-perm-button').off().click(function() { set_permissions(abs_path); });
+        parent.find('input[type=checkbox]').each(function(idx, element) {
+          var e = $(element);
+          e.prop('checked', bin_perms.charAt(9 - e.attr('data-bit')) == '1');
+        });
+      })
+      .popover('show');
+  }
+
+  // Use WebHDFS to set permissions on an absolute path
+  function set_permissions(abs_path) {
+    var p = 0;
+    $.each($('.popover .explorer-popover-perm-body input:checked'), function(idx, e) {
+      p |= 1 << (+$(e).attr('data-bit'));
+    });
+
+    var permission_mask = p.toString(8);
+
+    // PUT /webhdfs/v1/<path>?op=SETPERMISSION&permission=<permission>
+    var url = '/webhdfs/v1' + encode_path(abs_path) +
+      '?op=SETPERMISSION' + '&permission=' + permission_mask;
+
+    $.ajax(url, { type: 'PUT'
+      }).done(function(data) {
+        browse_directory(current_directory);
+      }).error(network_error_handler(url))
+      .complete(function() {
+        $('.explorer-perm-links').popover('destroy');
+      });
+  }
+
   function encode_path(abs_path) {
     abs_path = encodeURIComponent(abs_path);
     var re = /%2F/g;
@@ -198,6 +243,14 @@
           }
         });
 
+        //Set the handler for changing permissions
+        $('.explorer-perm-links').click(function() {
+          var filename = $(this).closest('tr').attr('inode-path');
+          var abs_path = append_path(current_directory, filename);
+          var perms = $(this).closest('tr').attr('data-permission');
+          view_perm_details($(this), filename, abs_path, perms);
+        });
+
         $('.explorer-entry .glyphicon-trash').click(function() {
           var inode_name = $(this).closest('tr').attr('inode-path');
           var absolute_file_path = append_path(current_directory, inode_name);
@@ -223,8 +276,7 @@
   }
 
   $('#btn-create-directory').on('show.bs.modal', function(event) {
-    var modal = $(this)
-    $('#new_directory_pwd').html(current_directory);
+    $('#new_directory_pwd').text(current_directory);
   });
 
   $('#btn-create-directory-send').click(function () {

hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/static/hadoop.css

@@ -267,3 +267,22 @@ header.bs-docs-nav, header.bs-docs-nav .navbar-brand {
 
 .explorer-entry .explorer-browse-links { cursor: pointer; }
 .explorer-entry .glyphicon-trash { cursor: pointer; }
+
+.popover {
+  max-width: 400px;
+}
+
+.explorer-popover-perm-body table  {
+  width: 30rem;
+}
+
+.explorer-popover-perm-body table > tbody > tr > td {
+  text-align: center;
+}
+
+.explorer-popover-perm-body label {
+    display:inline;
+    margin-bottom: 0;
+    font-weight: normal;
+    cursor: pointer;
+}