Re-factor the avatar system and support avatar uploads

The user is now able to upload an avatar, and pick one in a list.

This functionality should eventually be abstracted in a community
package but we still need to work on a great public API. We rely on
collectionFS to manage uploaded avatars. We also removed
bengott:avatar which was trying to solve the wrong problem (namely
displaying the avatar, which is as simple as displaying an image), and
not a avatar system as it should be.

Gravatar support is coming (back) soon. We may also want to have a
list of default fun avatars the user can choose instead of uploading
its own one.

client/components/users/userAvatar.js

@@ -1,17 +1,22 @@
+Meteor.subscribe('my-avatars');
+
 Template.userAvatar.helpers({
   userData: function() {
-    if (! this.user) {
-      this.user = Users.findOne(this.userId);
-    }
-    return this.user;
+    return Users.findOne(this.userId, {
+      fields: {
+        profile: 1,
+        username: 1
+      }
+    });
   },
+
   memberType: function() {
-    var userId = this.userId || this.user._id;
-    var user = Users.findOne(userId);
+    var user = Users.findOne(this.userId);
     return user && user.isBoardAdmin() ? 'admin' : 'normal';
   },
+
   presenceStatusClassName: function() {
-    var userPresence = Presences.findOne({ userId: this.user._id });
+    var userPresence = Presences.findOne({ userId: this.userId });
     if (! userPresence)
       return 'disconnected';
     else if (Session.equals('currentBoard', userPresence.state.currentBoardId))
@@ -20,3 +25,68 @@ Template.userAvatar.helpers({
       return 'idle';
   }
 });
+
+BlazeComponent.extendComponent({
+  template: function() {
+    return 'changeAvatarPopup';
+  },
+
+  avatarUrlOptions: function() {
+    return {
+      auth: false,
+      brokenIsFine: true
+    };
+  },
+
+  uploadedAvatars: function() {
+    return Avatars.find({userId: Meteor.userId()});
+  },
+
+  isSelected: function() {
+    var userProfile = Meteor.user().profile;
+    var avatarUrl = userProfile && userProfile.avatarUrl;
+    var currentAvatarUrl = this.currentData().url(this.avatarUrlOptions());
+    return avatarUrl === currentAvatarUrl;
+  },
+
+  setAvatar: function(avatarUrl) {
+    Meteor.users.update(Meteor.userId(), {
+      $set: {
+        'profile.avatarUrl': avatarUrl
+      }
+    });
+  },
+
+  events: function() {
+    return [{
+      'click .js-upload-avatar': function() {
+        this.$('.js-upload-avatar-input').click();
+      },
+      'change .js-upload-avatar-input': function(evt) {
+        var self = this;
+        var file, fileUrl;
+
+        FS.Utility.eachFile(evt, function(f) {
+          file = Avatars.insert(new FS.File(f));
+          fileUrl = file.url(self.avatarUrlOptions());
+        });
+        var fetchAvatarInterval = window.setInterval(function() {
+          $.ajax({
+            url: fileUrl,
+            success: function() {
+              self.setAvatar(file.url(self.avatarUrlOptions()));
+              window.clearInterval(fetchAvatarInterval);
+            }
+          });
+        }, 100);
+      },
+      'click .js-select-avatar': function() {
+        var avatarUrl = this.currentData().url(this.avatarUrlOptions());
+        this.setAvatar(avatarUrl);
+      },
+      'click .js-delete-avatar': function() {
+        Avatars.remove(this.currentData()._id);
+      }
+    }];
+  }
+}).register('changeAvatarPopup');