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diff --git a/models/trelloCreator.js b/models/trelloCreator.js
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+const DateString = Match.Where(function (dateAsString) {
+  check(dateAsString, String);
+  return moment(dateAsString, moment.ISO_8601).isValid();
+});
+
+export class TrelloCreator {
+  constructor(data) {
+    // we log current date, to use the same timestamp for all our actions.
+    // this helps to retrieve all elements performed by the same import.
+    this._nowDate = new Date();
+    // The object creation dates, indexed by Trello id
+    // (so we only parse actions once!)
+    this.createdAt = {
+      board: null,
+      cards: {},
+      lists: {},
+    };
+    // The object creator Trello Id, indexed by the object Trello id
+    // (so we only parse actions once!)
+    this.createdBy = {
+      cards: {}, // only cards have a field for that
+    };
+
+    // Map of labels Trello ID => Wekan ID
+    this.labels = {};
+    // Map of lists Trello ID => Wekan ID
+    this.lists = {};
+    // Map of cards Trello ID => Wekan ID
+    this.cards = {};
+    // The comments, indexed by Trello card id (to map when importing cards)
+    this.comments = {};
+    // the members, indexed by Trello member id => Wekan user ID
+    this.members = data.membersMapping ? data.membersMapping : {};
+
+    // maps a trelloCardId to an array of trelloAttachments
+    this.attachments = {};
+  }
+
+  /**
+   * If dateString is provided,
+   * return the Date it represents.
+   * If not, will return the date when it was first called.
+   * This is useful for us, as we want all import operations to
+   * have the exact same date for easier later retrieval.
+   *
+   * @param {String} dateString a properly formatted Date
+   */
+  _now(dateString) {
+    if(dateString) {
+      return new Date(dateString);
+    }
+    if(!this._nowDate) {
+      this._nowDate = new Date();
+    }
+    return this._nowDate;
+  }
+
+  /**
+   * if trelloUserId is provided and we have a mapping,
+   * return it.
+   * Otherwise return current logged user.
+   * @param trelloUserId
+   * @private
+     */
+  _user(trelloUserId) {
+    if(trelloUserId && this.members[trelloUserId]) {
+      return this.members[trelloUserId];
+    }
+    return Meteor.userId();
+  }
+
+  checkActions(trelloActions) {
+    check(trelloActions, [Match.ObjectIncluding({
+      data: Object,
+      date: DateString,
+      type: String,
+    })]);
+    // XXX we could perform more thorough checks based on action type
+  }
+
+  checkBoard(trelloBoard) {
+    check(trelloBoard, Match.ObjectIncluding({
+      closed: Boolean,
+      name: String,
+      prefs: Match.ObjectIncluding({
+        // XXX refine control by validating 'background' against a list of
+        // allowed values (is it worth the maintenance?)
+        background: String,
+        permissionLevel: Match.Where((value) => {
+          return ['org', 'private', 'public'].indexOf(value)>= 0;
+        }),
+      }),
+    }));
+  }
+
+  checkCards(trelloCards) {
+    check(trelloCards, [Match.ObjectIncluding({
+      closed: Boolean,
+      dateLastActivity: DateString,
+      desc: String,
+      idLabels: [String],
+      idMembers: [String],
+      name: String,
+      pos: Number,
+    })]);
+  }
+
+  checkLabels(trelloLabels) {
+    check(trelloLabels, [Match.ObjectIncluding({
+      // XXX refine control by validating 'color' against a list of allowed
+      // values (is it worth the maintenance?)
+      color: String,
+      name: String,
+    })]);
+  }
+
+  checkLists(trelloLists) {
+    check(trelloLists, [Match.ObjectIncluding({
+      closed: Boolean,
+      name: String,
+    })]);
+  }
+
+  checkChecklists(trelloChecklists) {
+    check(trelloChecklists, [Match.ObjectIncluding({
+      idBoard: String,
+      idCard: String,
+      name: String,
+      checkItems: [Match.ObjectIncluding({
+        state: String,
+        name: String,
+      })],
+    })]);
+  }
+
+  // You must call parseActions before calling this one.
+  createBoardAndLabels(trelloBoard) {
+    const boardToCreate = {
+      archived: trelloBoard.closed,
+      color: this.getColor(trelloBoard.prefs.background),
+      // very old boards won't have a creation activity so no creation date
+      createdAt: this._now(this.createdAt.board),
+      labels: [],
+      members: [{
+        userId: Meteor.userId(),
+        isAdmin: true,
+        isActive: true,
+        isCommentOnly: false,
+      }],
+      permission: this.getPermission(trelloBoard.prefs.permissionLevel),
+      slug: getSlug(trelloBoard.name) || 'board',
+      stars: 0,
+      title: trelloBoard.name,
+    };
+    // now add other members
+    if(trelloBoard.memberships) {
+      trelloBoard.memberships.forEach((trelloMembership) => {
+        const trelloId = trelloMembership.idMember;
+        // do we have a mapping?
+        if(this.members[trelloId]) {
+          const wekanId = this.members[trelloId];
+          // do we already have it in our list?
+          const wekanMember = boardToCreate.members.find((wekanMember) => wekanMember.userId === wekanId);
+          if(wekanMember) {
+            // we're already mapped, but maybe with lower rights
+            if(!wekanMember.isAdmin) {
+              wekanMember.isAdmin = this.getAdmin(trelloMembership.memberType);
+            }
+          } else {
+            boardToCreate.members.push({
+              userId: wekanId,
+              isAdmin: this.getAdmin(trelloMembership.memberType),
+              isActive: true,
+              isCommentOnly: false,
+            });
+          }
+        }
+      });
+    }
+    trelloBoard.labels.forEach((label) => {
+      const labelToCreate = {
+        _id: Random.id(6),
+        color: label.color,
+        name: label.name,
+      };
+      // We need to remember them by Trello ID, as this is the only ref we have
+      // when importing cards.
+      this.labels[label.id] = labelToCreate._id;
+      boardToCreate.labels.push(labelToCreate);
+    });
+    const boardId = Boards.direct.insert(boardToCreate);
+    Boards.direct.update(boardId, {$set: {modifiedAt: this._now()}});
+    // log activity
+    Activities.direct.insert({
+      activityType: 'importBoard',
+      boardId,
+      createdAt: this._now(),
+      source: {
+        id: trelloBoard.id,
+        system: 'Trello',
+        url: trelloBoard.url,
+      },
+      // We attribute the import to current user,
+      // not the author from the original object.
+      userId: this._user(),
+    });
+    return boardId;
+  }
+
+  /**
+   * Create the Wekan cards corresponding to the supplied Trello cards,
+   * as well as all linked data: activities, comments, and attachments
+   * @param trelloCards
+   * @param boardId
+   * @returns {Array}
+   */
+  createCards(trelloCards, boardId) {
+    const result = [];
+    trelloCards.forEach((card) => {
+      const cardToCreate = {
+        archived: card.closed,
+        boardId,
+        // very old boards won't have a creation activity so no creation date
+        createdAt: this._now(this.createdAt.cards[card.id]),
+        dateLastActivity: this._now(),
+        description: card.desc,
+        listId: this.lists[card.idList],
+        sort: card.pos,
+        title: card.name,
+        // we attribute the card to its creator if available
+        userId: this._user(this.createdBy.cards[card.id]),
+        dueAt: card.due ? this._now(card.due) : null,
+      };
+      // add labels
+      if (card.idLabels) {
+        cardToCreate.labelIds = card.idLabels.map((trelloId) => {
+          return this.labels[trelloId];
+        });
+      }
+      // add members {
+      if(card.idMembers) {
+        const wekanMembers = [];
+        // we can't just map, as some members may not have been mapped
+        card.idMembers.forEach((trelloId) => {
+          if(this.members[trelloId]) {
+            const wekanId = this.members[trelloId];
+            // we may map multiple Trello members to the same wekan user
+            // in which case we risk adding the same user multiple times
+            if(!wekanMembers.find((wId) => wId === wekanId)){
+              wekanMembers.push(wekanId);
+            }
+          }
+          return true;
+        });
+        if(wekanMembers.length>0) {
+          cardToCreate.members = wekanMembers;
+        }
+      }
+      // insert card
+      const cardId = Cards.direct.insert(cardToCreate);
+      // keep track of Trello id => WeKan id
+      this.cards[card.id] = cardId;
+      // log activity
+      Activities.direct.insert({
+        activityType: 'importCard',
+        boardId,
+        cardId,
+        createdAt: this._now(),
+        listId: cardToCreate.listId,
+        source: {
+          id: card.id,
+          system: 'Trello',
+          url: card.url,
+        },
+        // we attribute the import to current user,
+        // not the author of the original card
+        userId: this._user(),
+      });
+      // add comments
+      const comments = this.comments[card.id];
+      if (comments) {
+        comments.forEach((comment) => {
+          const commentToCreate = {
+            boardId,
+            cardId,
+            createdAt: this._now(comment.date),
+            text: comment.data.text,
+            // we attribute the comment to the original author, default to current user
+            userId: this._user(comment.idMemberCreator),
+          };
+          // dateLastActivity will be set from activity insert, no need to
+          // update it ourselves
+          const commentId = CardComments.direct.insert(commentToCreate);
+          Activities.direct.insert({
+            activityType: 'addComment',
+            boardId: commentToCreate.boardId,
+            cardId: commentToCreate.cardId,
+            commentId,
+            createdAt: this._now(commentToCreate.createdAt),
+            // we attribute the addComment (not the import)
+            // to the original author - it is needed by some UI elements.
+            userId: commentToCreate.userId,
+          });
+        });
+      }
+      const attachments = this.attachments[card.id];
+      const trelloCoverId = card.idAttachmentCover;
+      if (attachments) {
+        attachments.forEach((att) => {
+          const file = new FS.File();
+          // Simulating file.attachData on the client generates multiple errors
+          // - HEAD returns null, which causes exception down the line
+          // - the template then tries to display the url to the attachment which causes other errors
+          // so we make it server only, and let UI catch up once it is done, forget about latency comp.
+          if(Meteor.isServer) {
+            file.attachData(att.url, function (error) {
+              file.boardId = boardId;
+              file.cardId = cardId;
+              if (error) {
+                throw(error);
+              } else {
+                const wekanAtt = Attachments.insert(file, () => {
+                  // we do nothing
+                });
+                //
+                if(trelloCoverId === att.id) {
+                  Cards.direct.update(cardId, { $set: {coverId: wekanAtt._id}});
+                }
+              }
+            });
+          }
+          // todo XXX set cover - if need be
+        });
+      }
+      result.push(cardId);
+    });
+    return result;
+  }
+
+  // Create labels if they do not exist and load this.labels.
+  createLabels(trelloLabels, board) {
+    trelloLabels.forEach((label) => {
+      const color = label.color;
+      const name = label.name;
+      const existingLabel = board.getLabel(name, color);
+      if (existingLabel) {
+        this.labels[label.id] = existingLabel._id;
+      } else {
+        const idLabelCreated = board.pushLabel(name, color);
+        this.labels[label.id] = idLabelCreated;
+      }
+    });
+  }
+
+  createLists(trelloLists, boardId) {
+    trelloLists.forEach((list) => {
+      const listToCreate = {
+        archived: list.closed,
+        boardId,
+        // We are being defensing here by providing a default date (now) if the
+        // creation date wasn't found on the action log. This happen on old
+        // Trello boards (eg from 2013) that didn't log the 'createList' action
+        // we require.
+        createdAt: this._now(this.createdAt.lists[list.id]),
+        title: list.name,
+      };
+      const listId = Lists.direct.insert(listToCreate);
+      Lists.direct.update(listId, {$set: {'updatedAt': this._now()}});
+      this.lists[list.id] = listId;
+      // log activity
+      Activities.direct.insert({
+        activityType: 'importList',
+        boardId,
+        createdAt: this._now(),
+        listId,
+        source: {
+          id: list.id,
+          system: 'Trello',
+        },
+        // We attribute the import to current user,
+        // not the creator of the original object
+        userId: this._user(),
+      });
+    });
+  }
+
+  createChecklists(trelloChecklists) {
+    trelloChecklists.forEach((checklist) => {
+      // Create the checklist
+      const checklistToCreate = {
+        cardId: this.cards[checklist.idCard],
+        title: checklist.name,
+        createdAt: this._now(),
+      };
+      const checklistId = Checklists.direct.insert(checklistToCreate);
+      // Now add the items to the checklist
+      const itemsToCreate = [];
+      checklist.checkItems.forEach((item) => {
+        itemsToCreate.push({
+          _id: checklistId + itemsToCreate.length,
+          title: item.name,
+          isFinished: item.state === 'complete',
+        });
+      });
+      Checklists.direct.update(checklistId, {$set: {items: itemsToCreate}});
+    });
+  }
+
+  getAdmin(trelloMemberType) {
+    return trelloMemberType === 'admin';
+  }
+
+  getColor(trelloColorCode) {
+    // trello color name => wekan color
+    const mapColors = {
+      'blue': 'belize',
+      'orange': 'pumpkin',
+      'green': 'nephritis',
+      'red': 'pomegranate',
+      'purple': 'wisteria',
+      'pink': 'pomegranate',
+      'lime': 'nephritis',
+      'sky': 'belize',
+      'grey': 'midnight',
+    };
+    const wekanColor = mapColors[trelloColorCode];
+    return wekanColor || Boards.simpleSchema()._schema.color.allowedValues[0];
+  }
+
+  getPermission(trelloPermissionCode) {
+    if (trelloPermissionCode === 'public') {
+      return 'public';
+    }
+    // Wekan does NOT have organization level, so we default both 'private' and
+    // 'org' to private.
+    return 'private';
+  }
+
+  parseActions(trelloActions) {
+    trelloActions.forEach((action) => {
+      if (action.type === 'addAttachmentToCard') {
+        // We have to be cautious, because the attachment could have been removed later.
+        // In that case Trello still reports its addition, but removes its 'url' field.
+        // So we test for that
+        const trelloAttachment = action.data.attachment;
+        if(trelloAttachment.url) {
+          // we cannot actually create the Wekan attachment, because we don't yet
+          // have the cards to attach it to, so we store it in the instance variable.
+          const trelloCardId = action.data.card.id;
+          if(!this.attachments[trelloCardId]) {
+            this.attachments[trelloCardId] = [];
+          }
+          this.attachments[trelloCardId].push(trelloAttachment);
+        }
+      } else if (action.type === 'commentCard') {
+        const id = action.data.card.id;
+        if (this.comments[id]) {
+          this.comments[id].push(action);
+        } else {
+          this.comments[id] = [action];
+        }
+      } else if (action.type === 'createBoard') {
+        this.createdAt.board = action.date;
+      } else if (action.type === 'createCard') {
+        const cardId = action.data.card.id;
+        this.createdAt.cards[cardId] = action.date;
+        this.createdBy.cards[cardId] = action.idMemberCreator;
+      } else if (action.type === 'createList') {
+        const listId = action.data.list.id;
+        this.createdAt.lists[listId] = action.date;
+      }
+    });
+  }
+
+  check(board) {
+    try {
+      // check(data, {
+      //   membersMapping: Match.Optional(Object),
+      // });
+      this.checkActions(board.actions);
+      this.checkBoard(board);
+      this.checkLabels(board.labels);
+      this.checkLists(board.lists);
+      this.checkCards(board.cards);
+      this.checkChecklists(board.checklists);
+    } catch (e) {
+      throw new Meteor.Error('error-json-schema');
+    }
+  }
+
+  create(board) {
+    this.parseActions(board.actions);
+    const boardId = this.createBoardAndLabels(board);
+    this.createLists(board.lists, boardId);
+    this.createCards(board.cards, boardId);
+    this.createChecklists(board.checklists);
+    // XXX add members
+    return boardId;
+  }
+}