Support avatars and improve permissions integration on sandstorm

We now update the internal state of the application every time a user
connects to the application, which means that if the sandstorm sharing
graph has changed since the last time we saw a user, his permissions
will be updated accordingly.

sandstorm.js

@@ -3,49 +3,90 @@
 const isSandstorm = Meteor.settings && Meteor.settings.public &&
                     Meteor.settings.public.sandstorm;
 
-// In sandstorm we only have one board per sandstorm instance. Since we want to
-// keep most of our code unchanged, we simply hard-code a board `_id` and
-// redirect the user to this particular board.
-const sandstormBoard = {
-  _id: 'sandstorm',
-
-  // XXX Should be shared with the grain instance name.
-  title: 'Wekan',
-  slug: 'libreboard',
-
-  // Board access security is handled by sandstorm, so in our point of view we
-  // can alway assume that the board is public (unauthorized users won’t be able
-  // to access it anyway).
-  permission: 'public',
-};
-
-// The list of permissions a user have is provided by sandstorm accounts
-// package.
-function userHasPermission(user, permission) {
-  const userPermissions = user.services.sandstorm.permissions;
-  return userPermissions.indexOf(permission) > -1;
-}
-
 if (isSandstorm && Meteor.isServer) {
-  // Redirect the user to the hard-coded board. On the first launch the user
-  // will be redirected to the board before its creation. But that’s not a
-  // problem thanks to the reactive board publication. We used to do this
-  // redirection on the client side but that was sometimes visible on loading,
-  // and the home page was accessible by pressing the back button of the
-  // browser, a server-side redirection solves both of these issues.
-  //
-  // XXX Maybe sandstorm manifest could provide some kind of "home url"?
-  Picker.route('/', (params, request, response) => {
-    const base = request.headers['x-sandstorm-base-path'];
-    // XXX If this routing scheme changes, this will break. We should generation
-    // the location url using the router, but at the time of writting, the
-    // router is only accessible on the client.
+  // In sandstorm we only have one board per sandstorm instance. Since we want
+  // to keep most of our code unchanged, we simply hard-code a board `_id` and
+  // redirect the user to this particular board.
+  const sandstormBoard = {
+    _id: 'sandstorm',
+
+    // XXX Should be shared with the grain instance name.
+    title: 'Wekan',
+    slug: 'libreboard',
+    members: [],
+
+    // Board access security is handled by sandstorm, so in our point of view we
+    // can alway assume that the board is public (unauthorized users won't be
+    // able to access it anyway).
+    permission: 'public',
+  };
+
+  // This function should probably be handled by `accounts-sandstorm` but
+  // apparently meteor-core misses an API to handle that cleanly, cf.
+  // https://github.com/meteor/meteor/blob/ff783e9a12ffa04af6fd163843a563c9f4bbe8c1/packages/accounts-base/accounts_server.js#L1143
+  function updateUserAvatar(userId, avatarUrl) {
+    Users.update(userId, {
+      $set: {
+        'profile.avatarUrl': avatarUrl,
+      },
+    });
+  }
+
+  function updateUserPermissions(userId, permissions) {
+    const isActive = permissions.indexOf('participate') > -1;
+    const isAdmin = permissions.indexOf('configure') > -1;
+    const permissionDoc = { userId, isActive, isAdmin };
+
+    const boardMembers = Boards.findOne(sandstormBoard._id).members;
+    const memberIndex = _.indexOf(_.pluck(boardMembers, 'userId'), userId);
+
+    let modifier;
+    if (memberIndex > -1)
+      modifier = { $set: { [`members.${memberIndex}`]: permissionDoc }};
+    else if (!isActive)
+      modifier = {};
+    else
+      modifier = { $push: { members: permissionDoc }};
+
+    Boards.update(sandstormBoard._id, modifier);
+  }
+
+  Picker.route('/', (params, req, res) => {
+    // Redirect the user to the hard-coded board. On the first launch the user
+    // will be redirected to the board before its creation. But that's not a
+    // problem thanks to the reactive board publication. We used to do this
+    // redirection on the client side but that was sometimes visible on loading,
+    // and the home page was accessible by pressing the back button of the
+    // browser, a server-side redirection solves both of these issues.
+    //
+    // XXX Maybe sandstorm manifest could provide some kind of "home URL"?
+    const base = req.headers['x-sandstorm-base-path'];
+    // XXX If this routing scheme changes, this will break. We should generate
+    // the location URL using the router, but at the time of writing, the
+    // it is only accessible on the client.
     const path = `/boards/${sandstormBoard._id}/${sandstormBoard.slug}`;
 
-    response.writeHead(301, {
+    res.writeHead(301, {
       Location: base + path,
     });
-    response.end();
+    res.end();
+
+    // `accounts-sandstorm` populate the Users collection when new users
+    // accesses the document, but in case a already known user come back, we
+    // need to update his associated document to match the request HTTP headers
+    // informations.
+    const user = Users.findOne({
+      'services.sandstorm.id': req.headers['x-sandstorm-user-id'],
+    });
+    if (user) {
+      const userId = user._id;
+      const avatarUrl = req.headers['x-sandstorm-user-picture'];
+      const permissions = req.headers['x-sandstorm-permissions'].split(',') || [];
+
+      // XXX The user may also change his name, we should handle it.
+      updateUserAvatar(userId, avatarUrl);
+      updateUserPermissions(userId, permissions);
+    }
   });
 
   // On the first launch of the instance a user is automatically created thanks
@@ -56,38 +97,13 @@ if (isSandstorm && Meteor.isServer) {
   Users.after.insert((userId, doc) => {
     if (!Boards.findOne(sandstormBoard._id)) {
       Boards.insert(sandstormBoard, {validate: false});
-      Boards.update(sandstormBoard._id, {
-        $set: {
-          // The first member (the grain creator) has all rights
-          'members.0': {
-            userId: doc._id,
-            isActive: true,
-            isAdmin: true,
-          },
-        },
-      });
       Activities.update(
         { activityTypeId: sandstormBoard._id },
         { $set: { userId: doc._id }}
       );
     }
 
-    // If the hard-coded board already exists and we are inserting a new user,
-    // we need to update our user collection.
-    else if (userHasPermission(doc, 'participate')) {
-      Boards.update({
-        _id: sandstormBoard._id,
-        permission: 'public',
-      }, {
-        $push: {
-          members: {
-            userId: doc._id,
-            isActive: true,
-            isAdmin: userHasPermission(doc, 'configure'),
-          },
-        },
-      });
-    }
+    updateUserPermissions(doc._id, doc.services.sandstorm.permissions);
   });
 }
 
@@ -108,4 +124,4 @@ if (isSandstorm && Meteor.isClient) {
 // We use this blaze helper in the UI to hide some templates that does not make
 // sense in the context of sandstorm, like board staring, board archiving, user
 // name edition, etc.
-Blaze.registerHelper('isSandstorm', () => isSandstorm);
+Blaze.registerHelper('isSandstorm', isSandstorm);