All files / models backlink.js

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module.exports = function(crowi) {
  const debug = require('debug')('crowi:models:backlink')
  const mongoose = require('mongoose')
  const ObjectId = mongoose.Schema.Types.ObjectId
 
  var backlinkSchema
 
  backlinkSchema = new mongoose.Schema({
    page: { type: ObjectId, ref: 'Page', index: true },
    fromPage: { type: ObjectId, ref: 'Page' },
    fromRevision: { type: ObjectId, ref: 'Revision' },
    updatedAt: { type: Date, default: Date.now, index: true },
  })
 
  backlinkSchema.statics.findByPageId = function(pageId, limit, offset) {
    var Backlink = this
    limit = limit || 10
    offset = offset || 0
 
    limit = parseInt(limit, 10)
    offset = parseInt(offset, 10)
 
    return new Promise((resolve, reject) => {
      var conditions = {
        page: pageId,
      }
      var projection = {
        fromPage: 1,
        fromRevision: 1,
        updatedAt: 1,
      }
      var options = {
        limit: limit,
        skip: offset,
        sort: { updatedAt: -1 },
      }
 
      Backlink.find(conditions, projection, options)
        .populate('fromPage')
        .populate('fromRevision')
        .exec((err, backlinks) => {
          if (err) {
            return reject(err)
          }
 
          // populate author
          var options = {
            path: 'fromRevision.author',
            model: 'User',
            select: {
              username: 1,
              name: 1,
              image: 1,
            },
          }
          Backlink.populate(backlinks, options, (err, backlinks) => {
            if (err) {
              return reject(err)
            }
 
            return resolve(backlinks)
          })
        })
    })
  }
 
  backlinkSchema.statics.removeByPageId = function(pageId) {
    const Backlink = this
    return Backlink.remove({ fromPage: pageId })
  }
 
  backlinkSchema.statics.removeBySavedPage = function(savedPage) {
    var Backlink = this
 
    return new Promise((resolve, reject) => {
      var conditions = {
        fromPage: savedPage._id,
      }
 
      Backlink.remove(conditions, (err, data) => {
        Iif (err) {
          return reject(err)
        }
        return resolve(data)
      })
    })
  }
 
  backlinkSchema.statics.createByParameters = function(parameters) {
    var Backlink = this
 
    return new Promise((resolve, reject) => {
      var data = {
        page: parameters.page,
        fromPage: parameters.fromPage,
        fromRevision: parameters.fromRevision,
        updatedAt: Date.now(),
      }
      Backlink.create(data, (err, savedBacklink) => {
        Iif (err) {
          return reject(err)
        }
 
        return resolve(savedBacklink)
      })
    })
  }
 
  const convertLinksToPageIds = async (page, { paths, objectIds }) => {
    const Page = crowi.model('Page')
 
    let ids = await Promise.all([...paths.map(path => Page.isExistByPath(path)), ...objectIds.map(id => Page.isExistById(id))])
 
    // Make unique and remove own page
    ids = ids.filter((id, index, array) => array.indexOf(id) === index && id.toString() !== page._id.toString() && id !== false)
 
    return ids
  }
 
  backlinkSchema.statics.createBySavedPage = async function(savedPage) {
    const Backlink = this
    const linkDetector = require('../util/linkDetector')(crowi)
 
    if (!(savedPage.revision && savedPage.revision.body)) {
      throw new Error('no revision/body in savedPage')
    }
 
    const body = savedPage.revision.body
 
    await Backlink.removeBySavedPage(savedPage)
 
    const links = linkDetector.search(body)
    const ids = await convertLinksToPageIds(savedPage, links)
    return Promise.all(
      ids.map(id =>
        Backlink.createByParameters({
          page: id,
          fromPage: savedPage._id,
          fromRevision: savedPage.revision._id,
        }),
      ),
    )
      .then(backlinks => {
        debug('All backlinks saved')
        return backlinks
      })
      .catch(err => {
        throw err
      })
  }
 
  backlinkSchema.statics.createByAllPages = async function() {
    const Backlink = this
    const Page = crowi.model('Page')
    const Revision = crowi.model('Revision')
    const linkDetector = require('../util/linkDetector')(crowi)
 
    const pages = await Page.find({}).select('_id revision')
    const latestRevisionIds = pages.map(({ revision }) => revision)
 
    const revisions = await Revision.find({ _id: { $in: latestRevisionIds } }).and({
      $or: [{ body: linkDetector.getLinkRegexp() }, { body: linkDetector.getPathRegexps()[0] }, { body: linkDetector.getPathRegexps()[1] }],
    })
 
    await Backlink.remove({})
 
    return Promise.all(
      revisions.map(async ({ _id: revisionId, body }) => {
        const page = pages.find(({ revision }) => revision.toString() === revisionId.toString())
        const pageId = page._id
 
        const links = linkDetector.search(body)
        const ids = await convertLinksToPageIds(page, links)
        return Promise.all(
          ids.map(id =>
            Backlink.createByParameters({
              page: id,
              fromPage: pageId,
              fromRevision: revisionId,
            }),
          ),
        )
          .then(backlinks => {
            debug('All backlinks saved')
            return backlinks
          })
          .catch(err => {
            throw err
          })
      }),
    )
  }
 
  return mongoose.model('Backlink', backlinkSchema)
}