wekan/client/components/main/editor.js

import _sanitizeXss from 'xss';
const ASIS = 'asis';
const sanitizeXss = (input, options) => {
  const defaultAllowedIframeSrc = /^(https:){0,1}\/\/.*?(youtube|vimeo|dailymotion|youku)/i;
  const allowedIframeSrcRegex = (function() {
    let reg = defaultAllowedIframeSrc;
    const SAFE_IFRAME_SRC_PATTERN =
      Meteor.settings.public.SAFE_IFRAME_SRC_PATTERN;
    try {
      if (SAFE_IFRAME_SRC_PATTERN !== undefined) {
        reg = new RegExp(SAFE_IFRAME_SRC_PATTERN, 'i');
      }
    } catch (e) {
      /*eslint no-console: ["error", { allow: ["warn", "error"] }] */

      console.error('Wrong pattern specified', SAFE_IFRAM_SRC_PATTERN, e);
    }
    return reg;
  })();
  const targetWindow = '_blank';
  const getHtmlDOM = html => {
    const i = document.createElement('i');
    i.innerHTML = html;
    return i.firstChild;
  };
  options = {
    onTag(tag, html, options) {
      const htmlDOM = getHtmlDOM(html);
      const getAttr = attr => {
        return htmlDOM && attr && htmlDOM.getAttribute(attr);
      };
      if (tag === 'iframe') {
        const clipCls = 'note-vide-clip';
        if (!options.isClosing) {
          const iframeCls = getAttr('class');
          let safe = iframeCls.indexOf(clipCls) > -1;
          const src = getAttr('src');
          if (allowedIframeSrcRegex.exec(src)) {
            safe = true;
          }
          if (safe)
            return `<iframe src='${src}' class="${clipCls}" width=100% height=auto allowfullscreen></iframe>`;
        } else {
          // remove </iframe> tag
          return '';
        }
      } else if (tag === 'a') {
        if (!options.isClosing) {
          if (getAttr(ASIS) === 'true') {
            // if has a ASIS attribute, don't do anything, it's a member id
            return html;
          } else {
            const href = getAttr('href');
            if (href.match(/^((http(s){0,1}:){0,1}\/\/|\/)/)) {
              // a valid url
              return `<a href=${href} target=${targetWindow}>`;
            }
          }
        }
      } else if (tag === 'img') {
        if (!options.isClosing) {
          const src = getAttr('src');
          if (src) {
            return `<a href='${src}' class='swipebox'><img src='${src}' class="attachment-image-preview mCS_img_loaded"></a>`;
          }
        }
      }
      return undefined;
    },
    onTagAttr(tag, name, value) {
      if (tag === 'img' && name === 'src') {
        if (value && value.substr(0, 5) === 'data:') {
          // allow image with dataURI src
          return `${name}='${value}'`;
        }
      } else if (tag === 'a' && name === 'target') {
        return `${name}='${targetWindow}'`; // always change a href target to a new window
      }
      return undefined;
    },
    ...options,
  };
  return _sanitizeXss(input, options);
};
Template.editor.onRendered(() => {
  const textareaSelector = 'textarea';
  const mentions = [
    // User mentions
    {
      match: /\B@([\w.]*)$/,
      search(term, callback) {
        const currentBoard = Boards.findOne(Session.get('currentBoard'));
        callback(
          currentBoard
            .activeMembers()
            .map(member => {
              const user = Users.findOne(member.userId);
              if (user._id === Meteor.userId()) {
                return null;
              }
              const value = user.username;
              const username =
                value && value.match(/\s+/) ? `"${value}"` : value;
              return username.includes(term) ? username : null;
            })
            .filter(Boolean),
        );
      },
      template(value) {
        return value;
      },
      replace(username) {
        return `@${username} `;
      },
      index: 1,
    },
  ];
  const enableTextarea = function() {
    const $textarea = this.$(textareaSelector);
    autosize($textarea);
    $textarea.escapeableTextComplete(mentions);
  };
  if (Meteor.settings.public.RICHER_CARD_COMMENT_EDITOR !== false) {
    const isSmall = Utils.isMiniScreen();
    const toolbar = isSmall
      ? [
          ['view', ['fullscreen']],
          ['table', ['table']],
          ['font', ['bold']],
          ['color', ['color']],
          ['insert', ['video']], // iframe tag will be sanitized TODO if iframe[class=note-video-clip] can be added into safe list, insert video can be enabled
          //['fontsize', ['fontsize']],
        ]
      : [
          ['style', ['style']],
          ['font', ['bold', 'underline', 'clear']],
          ['fontsize', ['fontsize']],
          ['fontname', ['fontname']],
          ['color', ['color']],
          ['para', ['ul', 'ol', 'paragraph']],
          ['table', ['table']],
          ['insert', ['link', 'picture', 'video']], // iframe tag will be sanitized TODO if iframe[class=note-video-clip] can be added into safe list, insert video can be enabled
          //['insert', ['link', 'picture']], // modal popup has issue somehow :(
          ['view', ['fullscreen', 'help']],
        ];
    const cleanPastedHTML = sanitizeXss;
    const editor = '.editor';
    const selectors = [
      `.js-new-comment-form ${editor}`,
      `.js-edit-comment ${editor}`,
    ].join(','); // only new comment and edit comment
    const inputs = $(selectors);
    if (inputs.length === 0) {
      // only enable richereditor to new comment or edit comment no others
      enableTextarea();
    } else {
      const placeholder = inputs.attr('placeholder') || '';
      const mSummernotes = [];
      const getSummernote = function(input) {
        const idx = inputs.index(input);
        if (idx > -1) {
          return mSummernotes[idx];
        }
        return undefined;
      };
      let popupShown = false;
      inputs.each(function(idx, input) {
        mSummernotes[idx] = $(input).summernote({
          placeholder,
          callbacks: {
            onKeydown(e) {
              if (popupShown) {
                e.preventDefault();
              }
            },
            onKeyup(e) {
              if (popupShown) {
                e.preventDefault();
              }
            },
            onInit(object) {
              const originalInput = this;
              const setAutocomplete = function(jEditor) {
                if (jEditor !== undefined) {
                  jEditor.escapeableTextComplete(mentions).on({
                    'textComplete:show'() {
                      popupShown = true;
                    },
                    'textComplete:hide'() {
                      popupShown = false;
                    },
                  });
                }
              };
              $(originalInput).on('submitted', function() {
                // resetCommentInput has been called
                if (!this.value) {
                  const sn = getSummernote(this);
                  sn && sn.summernote('code', '');
                }
              });
              const jEditor = object && object.editable;
              const toolbar = object && object.toolbar;
              setAutocomplete(jEditor);
              if (toolbar !== undefined) {
                const fBtn = toolbar.find('.btn-fullscreen');
                fBtn.on('click', function() {
                  const $this = $(this),
                    isActive = $this.hasClass('active');
                  $('.minicards,#header-quick-access').toggle(!isActive); // mini card is still showing when editor is in fullscreen mode, we hide here manually
                });
              }
            },
            onImageUpload(files) {
              const $summernote = getSummernote(this);
              if (files && files.length > 0) {
                const image = files[0];
                const currentCard = Cards.findOne(Session.get('currentCard'));
                const MAX_IMAGE_PIXEL = Utils.MAX_IMAGE_PIXEL;
                const COMPRESS_RATIO = Utils.IMAGE_COMPRESS_RATIO;
                const insertImage = src => {
                  const img = document.createElement('img');
                  img.src = src;
                  img.setAttribute('width', '100%');
                  $summernote.summernote('insertNode', img);
                };
                const processData = function(fileObj) {
                  Utils.processUploadedAttachment(
                    currentCard,
                    fileObj,
                    attachment => {
                      if (
                        attachment &&
                        attachment._id &&
                        attachment.isImage()
                      ) {
                        attachment.one('uploaded', function() {
                          const maxTry = 3;
                          const checkItvl = 500;
                          let retry = 0;
                          const checkUrl = function() {
                            // even though uploaded event fired, attachment.url() is still null somehow //TODO
                            const url = attachment.url();
                            if (url) {
                              insertImage(
                                `${location.protocol}//${location.host}${url}`,
                              );
                            } else {
                              retry++;
                              if (retry < maxTry) {
                                setTimeout(checkUrl, checkItvl);
                              }
                            }
                          };
                          checkUrl();
                        });
                      }
                    },
                  );
                };
                if (MAX_IMAGE_PIXEL) {
                  const reader = new FileReader();
                  reader.onload = function(e) {
                    const dataurl = e && e.target && e.target.result;
                    if (dataurl !== undefined) {
                      // need to shrink image
                      Utils.shrinkImage({
                        dataurl,
                        maxSize: MAX_IMAGE_PIXEL,
                        ratio: COMPRESS_RATIO,
                        toBlob: true,
                        callback(blob) {
                          if (blob !== false) {
                            blob.name = image.name;
                            processData(blob);
                          }
                        },
                      });
                    }
                  };
                  reader.readAsDataURL(image);
                } else {
                  processData(image);
                }
              }
            },
            onPaste() {
              // clear up unwanted tag info when user pasted in text
              const thisNote = this;
              const updatePastedText = function(object) {
                const someNote = getSummernote(object);
                const original = someNote.summernote('code');
                const cleaned = cleanPastedHTML(original); //this is where to call whatever clean function you want. I have mine in a different file, called CleanPastedHTML.
                someNote.summernote('code', ''); //clear original
                someNote.summernote('pasteHTML', cleaned); //this sets the displayed content editor to the cleaned pasted code.
              };
              setTimeout(function() {
                //this kinda sucks, but if you don't do a setTimeout,
                //the function is called before the text is really pasted.
                updatePastedText(thisNote);
              }, 10);
            },
          },
          dialogsInBody: true,
          disableDragAndDrop: true,
          toolbar,
          popover: {
            image: [
              [
                'image',
                ['resizeFull', 'resizeHalf', 'resizeQuarter', 'resizeNone'],
              ],
              ['float', ['floatLeft', 'floatRight', 'floatNone']],
              ['remove', ['removeMedia']],
            ],
            table: [
              ['add', ['addRowDown', 'addRowUp', 'addColLeft', 'addColRight']],
              ['delete', ['deleteRow', 'deleteCol', 'deleteTable']],
            ],
            air: [
              ['color', ['color']],
              ['font', ['bold', 'underline', 'clear']],
            ],
          },
          height: 200,
        });
      });
    }
  } else {
    enableTextarea();
  }
});

// XXX I believe we should compute a HTML rendered field on the server that
// would handle markdown and user mentions. We can simply have two
// fields, one source, and one compiled version (in HTML) and send only the
// compiled version to most users -- who don't need to edit.
// In the meantime, all the transformation are done on the client using the
// Blaze API.
const at = HTML.CharRef({ html: '&commat;', str: '@' });
Blaze.Template.registerHelper(
  'mentions',
  new Template('mentions', function() {
    const view = this;
    let content = Blaze.toHTML(view.templateContentBlock);
    const currentBoard = Boards.findOne(Session.get('currentBoard'));
    if (!currentBoard) return HTML.Raw(sanitizeXss(content));
    const knowedUsers = currentBoard.members.map(member => {
      const u = Users.findOne(member.userId);
      if (u) {
        member.username = u.username;
      }
      return member;
    });
    const mentionRegex = /\B@(?:(?:"([\w.\s]*)")|([\w.]+))/gi; // including space in username

    let currentMention;
    while ((currentMention = mentionRegex.exec(content)) !== null) {
      const [fullMention, quoteduser, simple] = currentMention;
      const username = quoteduser || simple;
      const knowedUser = _.findWhere(knowedUsers, { username });
      if (!knowedUser) {
        continue;
      }

      const linkValue = [' ', at, knowedUser.username];
      let linkClass = 'atMention js-open-member';
      if (knowedUser.userId === Meteor.userId()) {
        linkClass += ' me';
      }
      const link = HTML.A(
        {
          class: linkClass,
          // XXX Hack. Since we stringify this render function result below with
          // `Blaze.toHTML` we can't rely on blaze data contexts to pass the
          // `userId` to the popup as usual, and we need to store it in the DOM
          // using a data attribute.
          'data-userId': knowedUser.userId,
          [ASIS]: 'true',
        },
        linkValue,
      );

      content = content.replace(fullMention, Blaze.toHTML(link));
    }
    return HTML.Raw(sanitizeXss(content));
  }),
);
Template.viewer.events({
  // Viewer sometimes have click-able wrapper around them (for instance to edit
  // the corresponding text). Clicking a link shouldn't fire these actions, stop
  // we stop these event at the viewer component level.
  'click a'(event, templateInstance) {
    let prevent = true;
    const userId = event.currentTarget.dataset.userid;
    if (userId) {
      Popup.open('member').call({ userId }, event, templateInstance);
    } else {
      const href = event.currentTarget.href;
      const child = event.currentTarget.firstElementChild;
      if (child && child.tagName === 'IMG') {
        prevent = false;
      } else if (href) {
        window.open(href, '_blank');
      }
    }
    if (prevent) {
      event.stopPropagation();

      // XXX We hijack the build-in browser action because we currently don't have
      // `_blank` attributes in viewer links, and the transformer function is
      // handled by a third party package that we can't configure easily. Fix that
      // by using directly `_blank` attribute in the rendered HTML.
      event.preventDefault();
    }
  },
});