Add Template Gallery support

services/web/modules/template-gallery/app/src/CleanHtml.mjs

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+import sanitizeHtml from 'sanitize-html'
+
+const sanitizeOptions = {
+  linksOnly: {
+    allowedTags: ["a"],
+    allowedAttributes: { "a": ["href"] }
+  },
+  reachText: {
+    allowedTags: ["h1", "h2", "h3", "h4", "h5", "h6",
+                  "p", "blockquote", "ul", "ol", "li",
+                  "em", "strong", "s", "code", "pre", "hr", "a"],
+    allowedAttributes: { "a": ["href"] }
+  },
+  plainText: {
+    allowedTags: [],
+    allowedAttributes: {},
+  },
+}
+
+export function cleanHtml(text, sanitizeType) {
+  return sanitizeHtml(text, sanitizeOptions[sanitizeType])
+}

services/web/modules/template-gallery/app/src/TemplateErrors.mjs

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+import OError from '@overleaf/o-error'
+
+export class TemplateNameConflictError extends OError {
+  constructor(ownerId, message = 'template_with_this_title_exists_and_owned_by_x') {
+    super(message, { ownerId })
+  }
+}
+
+export class RecompileRequiredError extends OError {
+  constructor(message = 'Recompile required') {
+    super(message, { status: 400 })
+  }
+}

services/web/modules/template-gallery/app/src/TemplateGalleryController.mjs

@@ -0,0 +1,162 @@
+import logger from '@overleaf/logger'
+import ErrorController from '../../../../app/src/Features/Errors/ErrorController.js'
+import Errors from '../../../../app/src/Features/Errors/Errors.js'
+import SessionManager from '../../../../app/src/Features/Authentication/SessionManager.js'
+import TemplateGalleryManager from'./TemplateGalleryManager.mjs'
+import { getUserName } from './TemplateGalleryHelper.mjs'
+import { TemplateNameConflictError, RecompileRequiredError } from './TemplateErrors.mjs'
+import Settings from '@overleaf/settings'
+
+async function createTemplateFromProject(req, res, next) {
+  const t = req.i18n.translate
+  try {
+    const userId = SessionManager.getLoggedInUserId(req.session)
+    const result = await TemplateGalleryManager.createTemplateFromProject({
+      projectId: req.params.Project_id,
+      userId,
+      templateSource: req.body,
+    })
+    if (result.conflict) {
+      const ownerName = (result.templateOwnerName === 'you') ? t('you') : result.templateOwnerName
+      const message = `${t('template_with_this_title_exists_and_owned_by_x', { x: ownerName })} `
+                    + t(result.canOverride ? 'do_you_want_to_overwrite_it' : 'you_cant_overwrite_it')
+      return res.status(409).json({ canOverride: result.canOverride, message })
+    }
+    return res.status(200).json({ template_id: result.templateId })
+  } catch (error) {
+    if (error instanceof Errors.InvalidNameError) {
+      return res.status(error.info?.status || 400).json({ message: error.message })
+    }
+
+    const mainMessage = t('failed_to_publish_as_a_template')
+    if (error instanceof RecompileRequiredError) {
+      return res.status(error.info?.status || 400).json({
+        message: `${mainMessage} ${t('try_recompile_project')}`
+      })
+    }
+    return res.status(400).json({ message: mainMessage })
+  }
+}
+
+async function editTemplate(req, res, next) {
+  const t = req.i18n.translate
+  try {
+    const result = await TemplateGalleryManager.editTemplate({
+      templateId: req.params.template_id,
+      updates: req.body
+    })
+    res.status(200).json(result)
+  } catch (error) {
+    if (error instanceof TemplateNameConflictError) {
+      const ownerId = error.info?.ownerId
+      const userId = SessionManager.getLoggedInUserId(req.session)
+      const ownerName = (ownerId === userId)
+        ? t('you')
+        : await getUserName(ownerId) || t('unknown')
+      const message = t(error.message, { x: ownerName })
+      return res.status(409).json({ message })
+    }
+    if (error instanceof Errors.InvalidNameError) {
+      return res.status(error.info?.status || 400).json({ message: error.message })
+    }
+    logger.error({ error }, 'Failure saving template')
+    return res.status(500).json({ message: t('something_went_wrong_server') })
+  }
+}
+
+async function deleteTemplate(req, res, next) {
+  const t = req.i18n.translate
+  try {
+    await TemplateGalleryManager.deleteTemplate({
+      templateId: req.params.template_id,
+      version: req.body.version
+    })
+    res.sendStatus(200)
+  } catch (error) {
+    logger.error({ error }, 'Failure deleting template')
+    return res.status(500).json({ message: t('something_went_wrong_server') })
+  }
+}
+
+async function getTemplatePreview(req, res, next) {
+  try {
+    const templateId = req.params.template_id
+    const { version, style } = req.query
+
+    const { stream, contentType } = await TemplateGalleryManager.fetchTemplatePreview({ templateId, version, style })
+
+    res.setHeader('Content-Type', contentType)
+    stream.pipe(res)
+  } catch (error) {
+    if (error.info?.status == 404) {
+      return ErrorController.notFound(req, res, next)
+    }
+    return res.status(error.info?.status || 400).json(error.info)
+  }
+}
+
+async function templatesCategoryPage(req, res, next) {
+  const t = req.i18n.translate
+  try {
+    let { category } = req.params
+    const result = await TemplateGalleryManager.getTemplatesPageData(category)
+
+    let title
+    if (result.categoryName) {
+      title = t('latex_templates') + ' — ' + result.categoryName
+    } else {
+      category = null
+      title = t('templates_page_title')
+    }
+    res.render('template_gallery/template-gallery', {
+      title,
+      category,
+    })
+  } catch (error) {
+    next(error)
+  }
+}
+
+async function templateDetailsPage(req, res, next) {
+  const t = req.i18n.translate
+  try {
+    const template = await TemplateGalleryManager.getTemplate('_id', req.params.template_id)
+    res.render('template_gallery/template', {
+      title: `${t('template')}: ${template.name}`,
+      template: JSON.stringify(template),
+      languages: Settings.languages,
+    })
+  } catch (error) {
+    return ErrorController.notFound(req, res, next)
+  }
+}
+
+async function getTemplateJSON(req, res, next) {
+  try {
+    const { key, val } = req.query
+    const template = await TemplateGalleryManager.getTemplate(key, val)
+    res.json(template)
+  } catch (error) {
+    next(error)
+  }
+}
+
+async function getCategoryTemplatesJSON(req, res, next) {
+  try {
+    const result = await TemplateGalleryManager.getCategoryTemplates(req.query)
+    res.json(result)
+  } catch (error) {
+    next(error)
+  }
+}
+
+export default {
+  createTemplateFromProject,
+  editTemplate,
+  deleteTemplate,
+  getTemplatePreview,
+  templatesCategoryPage,
+  templateDetailsPage,
+  getTemplateJSON,
+  getCategoryTemplatesJSON,
+}

services/web/modules/template-gallery/app/src/TemplateGalleryHelper.mjs

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+import MarkdownIt from 'markdown-it'
+import request from 'request'
+import logger from '@overleaf/logger'
+import settings from '@overleaf/settings'
+import Errors from '../../../../app/src/Features/Errors/Errors.js'
+import ProjectGetter from '../../../../app/src/Features/Project/ProjectGetter.js'
+import ProjectLocator from '../../../../app/src/Features/Project/ProjectLocator.js'
+import ProjectZipStreamManager from '../../../../app/src/Features/Downloads/ProjectZipStreamManager.mjs'
+import DocumentUpdaterHandler from '../../../../app/src/Features/DocumentUpdater/DocumentUpdaterHandler.js'
+import ClsiManager from '../../../../app/src/Features/Compile/ClsiManager.js'
+import CompileManager from '../../../../app/src/Features/Compile/CompileManager.js'
+import UserGetter from '../../../../app/src/Features/User/UserGetter.js'
+import { fetchStreamWithResponse } from '@overleaf/fetch-utils'
+import { Template } from './models/Template.js'
+import { RecompileRequiredError } from './TemplateErrors.mjs'
+import { cleanHtml }  from './CleanHtml.mjs'
+
+const TIMEOUT = 30000
+
+const MAX_PROJECT_NAME_LENGTH = 150
+const MAX_FORM_INPUT_LENGTH = 512
+const MAX_TEMPLATE_DESCRIPTION_LENGTH = 4096
+
+const markdownIt = new MarkdownIt({ html: false, linkify: true })
+
+function _createZipStreamForProjectAsync(projectId) {
+  return new Promise((resolve, reject) => {
+    ProjectZipStreamManager.createZipStreamForProject(projectId, (err, archive) => {
+      if (err) {
+        return reject(err)
+      }
+      archive.on('error', (err) => reject(err))
+      resolve(archive)
+    })
+  })
+}
+
+export function validateTemplateInput({ name, descriptionMD, authorMD, license }) {
+  if (name?.length > MAX_PROJECT_NAME_LENGTH) {
+    throw new Errors.InvalidNameError(`Template title exceeds the maximum length of ${MAX_PROJECT_NAME_LENGTH} characters.`)
+  }
+  if (descriptionMD?.length > MAX_TEMPLATE_DESCRIPTION_LENGTH) {
+    throw new Errors.InvalidNameError(`Template description exceeds the maximum length of ${MAX_TEMPLATE_DESCRIPTION_LENGTH} characters.`)
+  }
+  if (authorMD?.length > MAX_FORM_INPUT_LENGTH) {
+    throw new Errors.InvalidNameError('Author name is too long.')
+  }
+  if (license?.length > MAX_FORM_INPUT_LENGTH) {
+    throw new Errors.InvalidNameError('License name is too long.')
+  }
+}
+
+export async function canUserOverrideTemplate(template, userId) {
+  let templateOwnerId = template.owner
+  let templateOwnerName = 'you'
+  let userIsOwner = true
+  let userIsAdmin
+  if (templateOwnerId != userId) {
+    userIsOwner = false
+    try {
+      userIsAdmin = (await UserGetter.promises.getUser(userId, { isAdmin: 1 })).isAdmin
+    } catch {
+      logger.error({ error, userId }, 'Logged in user does not exist, strange...')
+      userIsAdmin = false
+    }
+    templateOwnerName = await getUserName(templateOwnerId) || 'unknown'
+  }
+  const canOverride = userIsOwner || userIsAdmin
+  return { canOverride, templateOwnerName }
+}
+
+export async function getUserName(userId) {
+  try {
+    const user = await UserGetter.promises.getUser(userId, {
+      first_name: 1,
+      last_name: 1,
+    })
+    return ((user?.first_name || "") + " " + (user?.last_name || "")).trim()
+  } catch (error) {
+    return 'unknown'
+  }
+}
+
+export async function generateTemplateData(projectId, {
+  descriptionMD,
+  authorMD,
+  category,
+  license,
+  name,
+}) {
+  try {
+    await DocumentUpdaterHandler.promises.flushProjectToMongo(projectId)
+
+    const project = await ProjectGetter.promises.getProject(projectId, {
+      imageName: true,
+      compiler: true,
+      spellCheckLanguage: true,
+      rootDoc_id: true,
+      rootFolder: true,
+    })
+
+    const { path } = await ProjectLocator.promises.findRootDoc({ project })
+    const mainFile = path.fileSystem.replace(/^\/+/, '')
+    const template = {
+      name,
+      category,
+      authorMD,
+      descriptionMD,
+      license,
+      mainFile,
+      compiler: project.compiler,
+      imageName: project.imageName,
+      language: project.spellCheckLanguage,
+      lastUpdated: new Date(),
+    }
+
+    await renderTemplateHtmlFields(template)
+    return template
+  } catch (error) {
+    logger.error({ error, projectId }, 'Failed to retrieve project data')
+    throw error
+  }
+}
+
+export async function uploadTemplateAssets(projectId, userId, build, template) {
+  let zipStream, pdfStream
+  try {
+    [zipStream, pdfStream] = await Promise.all([
+      _createZipStreamForProjectAsync(projectId),
+      CompileManager.promises
+        .getProjectCompileLimits(projectId)
+        .then((limits) =>
+          ClsiManager.promises.getOutputFileStream(projectId, userId, limits, undefined, build, 'output.pdf')
+        )
+    ])
+  } catch (error) {
+    logger.error({ error, projectId }, 'No output.pdf?')
+    throw new RecompileRequiredError()
+  }
+  try {
+    const templateUrl = `${settings.apis.filestore.url}/template/${template._id}/v/${template.version}`
+    const zipUrl = `${templateUrl}/zip`
+    const pdfUrl = `${templateUrl}/pdf`
+    const [zipReq, pdfReq] = await Promise.all([
+      fetchStreamWithResponse(zipUrl, {
+        method: 'POST',
+        headers: {
+          'Content-Type': 'application/octet-stream',
+        },
+        body: zipStream,
+        signal: AbortSignal.timeout(TIMEOUT),
+      }),
+      fetchStreamWithResponse(pdfUrl, {
+        method: 'POST',
+        headers: {
+          'Content-Type': 'application/pdf',
+        },
+        body: pdfStream,
+        signal: AbortSignal.timeout(TIMEOUT),
+      }),
+    ])
+    const uploadErrors = []
+    if (zipReq?.response.status !== 200) {
+      uploadErrors.push({ file: 'zip', uri: zipUrl, statusCode: zipReq.response.status })
+    }
+    if (pdfReq?.response.status !== 200) {
+      uploadErrors.push({ file: 'pdf', uri: pdfUrl, statusCode: pdfReq.response.status })
+    }
+    if (uploadErrors.length > 0) {
+      logger.error({ uploadErrors }, 'Template upload failed')
+      throw new RecompileRequiredError()
+    }
+  } catch (error) {
+    if (error instanceof RecompileRequiredError) throw error
+    throw error
+  }
+}
+
+export async function deleteTemplateAssets(templateId, version, deleteFromDb) {
+  if (deleteFromDb) {
+    try {
+      await Template.deleteOne({ _id: templateId }).exec()
+    } catch (error) {
+      logger.error({ err, templateId }, 'Failed to delete template from MongoDB')
+      throw error
+    }
+  }
+
+  // kick off file deletions, but don't wait
+  const baseUrl = settings.apis.filestore.url
+  const urlTemplate = `${baseUrl}/template/${templateId}/v/${version}/zip`
+  const urlImages = `${baseUrl}/template/${templateId}/v/${version}/pdf`
+
+  const optsTemplate = {
+    method: 'DELETE',
+    uri: urlTemplate,
+    timeout: TIMEOUT,
+  }
+
+  const optsImages = {
+    method: 'DELETE',
+    uri: urlImages,
+    timeout: TIMEOUT,
+  }
+
+  request(optsTemplate, (err, response) => {
+    if (err)
+      logger.warn({ err, templateId }, 'Failed to delete template zip from filestore')
+  })
+
+  request(optsImages, (err, response) => {
+    if (err)
+      logger.warn({ err, templateId }, 'Failed to delete images from filestore')
+  })
+}
+
+export function renderTemplateHtmlFields(updates) {
+  if (updates.descriptionMD !== undefined) {
+    const descriptionRawHTML = markdownIt.render(updates.descriptionMD)
+    updates.description = cleanHtml(descriptionRawHTML, "reachText")
+  }
+  if (updates.authorMD !== undefined) {
+    const authorRawHTML = markdownIt.render(updates.authorMD)
+    updates.author = cleanHtml(authorRawHTML, "linksOnly")
+  }
+}

services/web/modules/template-gallery/app/src/TemplateGalleryManager.mjs

@@ -0,0 +1,214 @@
+import _ from 'lodash'
+import logger from '@overleaf/logger'
+import { Readable } from 'stream'
+import settings from '@overleaf/settings'
+import { OError } from '../../../../app/src/Features/Errors/Errors.js'
+import { Template } from './models/Template.js'
+import {
+  validateTemplateInput,
+  renderTemplateHtmlFields,
+  uploadTemplateAssets,
+  deleteTemplateAssets,
+  canUserOverrideTemplate,
+  generateTemplateData
+} from './TemplateGalleryHelper.mjs'
+import { cleanHtml }  from './CleanHtml.mjs'
+import { TemplateNameConflictError } from './TemplateErrors.mjs'
+import { fetchStreamWithResponse } from '@overleaf/fetch-utils'
+const TIMEOUT = 30000
+
+async function editTemplate({ templateId, updates }) {
+
+  validateTemplateInput(updates)
+
+  const template = await Template.findById(templateId)
+  if (!template) {
+    throw new OError('Current template not found, strange...', { status: 500, templateId })
+  }
+
+  if (updates.name) {
+    const conflictingTemplate = await Template.findOne(
+      { name: updates.name, _id: { $ne: templateId } },
+      { owner: true }
+    ).exec()
+    if (conflictingTemplate) {
+      throw new TemplateNameConflictError(String(conflictingTemplate.owner))
+    }
+  }
+
+  await renderTemplateHtmlFields(updates)
+  updates.lastUpdated = new Date()
+  Object.assign(template, updates)
+
+  await template.save()
+
+  return updates
+}
+
+async function deleteTemplate({ templateId, version }) {
+  await deleteTemplateAssets(templateId, version, true)
+}
+
+async function createTemplateFromProject({ projectId, userId, templateSource }) {
+  validateTemplateInput(templateSource)
+  let template = await Template.findOne({ name: templateSource.name }).exec()
+
+  if (template && !templateSource.override) {
+    const { canOverride, templateOwnerName } = await canUserOverrideTemplate(template, userId)
+
+    return {
+      conflict: true,
+      canOverride,
+      templateOwnerName
+    }
+  }
+
+  const templateData = await generateTemplateData(projectId, templateSource)
+
+  let previousVersionExists
+  if (!template) {
+    template = new Template(templateData)
+    template.owner = userId
+    previousVersionExists = false
+  } else {
+    Object.assign(template, templateData, {
+      version: template.version + 1,
+    })
+    previousVersionExists = true
+  }
+
+  await uploadTemplateAssets(projectId, userId, templateSource.build, template)
+  await template.save()
+
+  if (previousVersionExists) {
+    deleteTemplateAssets(template._id, template.version - 1, false)
+  }
+  return {
+    conflict: false,
+    templateId: template._id,
+  }
+}
+
+async function fetchTemplatePreview({ templateId, version, style }) {
+  if (!templateId || !version) {
+    throw new OError('Template ID and version are required', { status: 404 })
+  }
+  const styleParam = style ? `style=${style}` : ''
+  const isImage = (style === 'preview' || style === 'thumbnail')
+
+  if (style && !isImage) {
+    throw new OError('Wrong style', { status: 404, style })
+  }
+
+  const pdfUrl = `${settings.apis.filestore.url}/template/${templateId}/v/${version}/pdf?${styleParam}`
+  const { response } = await fetchStreamWithResponse(pdfUrl, {
+    method: 'GET',
+    signal: AbortSignal.timeout(TIMEOUT),
+  })
+
+  if (!response.ok) {
+    throw new OError(`Failed to fetch file: ${response.statusText}`, { status: 400, templateId, version, styleParam })
+  }
+
+  return {
+    stream: Readable.from(response.body),
+    contentType: isImage ? 'application/octet-stream' : 'application/pdf'
+  }
+}
+
+async function getTemplatesPageData(category) {
+  const categoryName = settings.templateLinks.find(item => item.url.endsWith(`/${category}`))?.name
+  const templateLinks = categoryName ? undefined : settings.templateLinks.filter(link => link.url !== '/templates/all')
+  return {
+    categoryName,
+    templateLinks
+  }
+}
+
+async function getTemplate(key, val) {
+  if (!key || !val) {
+    logger.warn('No key or val provided to getTemplate')
+    return null
+  }
+
+  const query = { [key]: val }
+  const template = await Template.findOne(query).exec()
+  if (!template) return null
+
+  return _formatTemplateForPage(template)
+}
+
+async function getCategoryTemplates(reqQuery) {
+  const {
+    category,
+    by = 'lastUpdated',
+    order = 'desc',
+  } = reqQuery || {}
+
+  const query = (category === 'all') ? {} : { category : '/templates/' + category }
+  const projection = { _id : 1, version : 1, name : 1, author : 1, description : 1, lastUpdated : 1 }
+  const allTemplates = await Template.find(query, projection).exec()
+  const formattedTemplates = allTemplates.map(_formatTemplateForList)
+  const sortedTemplates = _sortTemplates(formattedTemplates, { by, order })
+
+  return {
+    totalSize: sortedTemplates.length,
+    templates: sortedTemplates,
+  }
+}
+
+function _sortTemplates(templates, sort) {
+  if (
+    (sort.by && !['lastUpdated', 'name'].includes(sort.by)) ||
+    (sort.order && !['asc', 'desc'].includes(sort.order))
+  ) {
+    throw new OError('Invalid sorting criteria', { status: 400, sort })
+  }
+  const sortedTemplates = _.orderBy(
+    templates,
+    [sort.by || 'lastUpdated'],
+    [sort.order || 'desc']
+  )
+  return sortedTemplates
+}
+
+function _formatTemplateForList(template) {
+  return {
+    id: String(template._id),
+    version: String(template.version),
+    name: template.name,
+    author: cleanHtml(template.author, "plainText"),
+    description: cleanHtml(template.description, "plainText"),
+    lastUpdated: template.lastUpdated,
+  }
+}
+
+function _formatTemplateForPage(template) {
+  return {
+    id: template._id.toString(),
+    version: template.version.toString(),
+    category: template.category,
+    name: template.name,
+    author: cleanHtml(template.author, "linksOnly"),
+    authorMD: template.authorMD,
+    description: cleanHtml(template.description, "reachText"),
+    descriptionMD: template.descriptionMD,
+    license: template.license,
+    lastUpdated: template.lastUpdated,
+    owner: template.owner,
+    mainFile: template.mainFile,
+    compiler: template.compiler,
+    imageName: template.imageName,
+    language: template.language,
+  }
+}
+
+export default {
+  createTemplateFromProject,
+  editTemplate,
+  deleteTemplate,
+  getTemplate,
+  getCategoryTemplates,
+  fetchTemplatePreview,
+  getTemplatesPageData,
+}

services/web/modules/template-gallery/app/src/TemplateGalleryRouter.mjs

@@ -0,0 +1,77 @@
+import logger from '@overleaf/logger'
+
+import AuthenticationController from '../../../../app/src/Features/Authentication/AuthenticationController.js'
+import RateLimiterMiddleware from '../../../../app/src/Features/Security/RateLimiterMiddleware.js'
+import { RateLimiter } from '../../../../app/src/infrastructure/RateLimiter.js'
+import TemplateGalleryController from './TemplateGalleryController.mjs'
+
+const rateLimiter = new RateLimiter('create-project-from-template', {
+  points: 20,
+  duration: 60,
+})
+const rateLimiterThumbnails = new RateLimiter('gallery-thumbnails', {
+  points: 360,
+  duration: 60,
+})
+
+export default {
+  rateLimiter,
+  apply(webRouter) {
+    logger.debug({}, 'Init templates router')
+
+    webRouter.post(
+      '/template/new/:Project_id',
+      AuthenticationController.requireLogin(),
+      RateLimiterMiddleware.rateLimit(rateLimiter),
+      TemplateGalleryController.createTemplateFromProject
+    )
+
+    webRouter.get(
+      '/template/:template_id',
+      RateLimiterMiddleware.rateLimit(rateLimiter),
+      TemplateGalleryController.templateDetailsPage
+    )
+
+    webRouter.post(
+      '/template/:template_id/edit',
+      AuthenticationController.requireLogin(),
+      RateLimiterMiddleware.rateLimit(rateLimiter),
+      TemplateGalleryController.editTemplate
+    )
+
+    webRouter.delete(
+      '/template/:template_id/delete',
+      AuthenticationController.requireLogin(),
+      RateLimiterMiddleware.rateLimit(rateLimiter),
+      TemplateGalleryController.deleteTemplate
+    )
+
+    webRouter.get(
+      '/templates/:category?',
+      RateLimiterMiddleware.rateLimit(rateLimiter),
+      TemplateGalleryController.templatesCategoryPage
+    )
+
+    webRouter.get(
+      '/api/template',
+      RateLimiterMiddleware.rateLimit(rateLimiter),
+      TemplateGalleryController.getTemplateJSON
+    )
+
+    webRouter.get(
+      '/api/templates',
+      RateLimiterMiddleware.rateLimit(rateLimiter),
+      TemplateGalleryController.getCategoryTemplatesJSON
+    )
+
+    webRouter.get(
+      '/template/:template_id/preview',
+      (req, res, next) => {
+        req.query.style === 'thumbnail'
+          ? RateLimiterMiddleware.rateLimit(rateLimiterThumbnails)(req, res, next)
+          : RateLimiterMiddleware.rateLimit(rateLimiter)(req, res, next)
+      },
+      TemplateGalleryController.getTemplatePreview
+    )
+  },
+}

services/web/modules/template-gallery/app/src/models/Template.js

@@ -0,0 +1,33 @@
+const mongoose = require('../../../../../app/src/infrastructure/Mongoose')
+
+const { Schema } = mongoose
+const { ObjectId } = Schema
+
+const TemplateSchema = new Schema(
+  {
+    name: { type: String, required: true },
+    category: { type: String, required: true },
+    description: { type: String },
+    descriptionMD: { type: String },
+    author: { type: String },
+    authorMD: { type: String },
+    license: { type: String, required: true },
+    mainFile: { type: String, required: true },
+    compiler: { type: String, required: true },
+    imageName: { type: String },
+    language: { type: String, required: true },
+    version: { type: Number, default: 1, required: true },
+    owner: { type: ObjectId, ref: 'User' },
+    lastUpdated: {
+      type: Date,
+      default() {
+        return new Date()
+      },
+    required: true
+    },
+  },
+  { minimize: false }
+)
+
+exports.Template = mongoose.model('Template', TemplateSchema)
+exports.TemplateSchema = TemplateSchema

services/web/modules/template-gallery/index.mjs

@@ -0,0 +1,33 @@
+import Settings from '@overleaf/settings'
+import TemplateGalleryRouter from './app/src/TemplateGalleryRouter.mjs'
+const TemplateGalleryModule = {
+  router: TemplateGalleryRouter,
+}
+
+function boolFromEnv(env) {
+  if (env === undefined || env === null) return undefined
+  if (typeof env === "string") {
+    const envLower = env.toLowerCase()
+    if (envLower === 'true') return true
+    if (envLower === 'false') return false
+  }
+  throw new Error("Invalid value for boolean envirionment variable")
+}
+
+Settings.templates = {
+  nonAdminCanManage: boolFromEnv(process.env.OVERLEAF_NON_ADMIN_CAN_MANAGE_TEMPLATES)
+}
+
+Settings.templateLinks = (`${process.env.OVERLEAF_TEMPLATE_KEYS} all`).split(/\s+/).map(key => {
+  const envKeyBase = key.toUpperCase().replace(/-/g, "_")
+  const name = process.env[`TEMPLATE_${envKeyBase}_NAME`]
+  const description = process.env[`TEMPLATE_${envKeyBase}_DESCRIPTION`]
+
+  return {
+    name: name || key,
+    url: `/templates/${key}`,
+    description: description || "Templates category"
+  }
+})
+
+export default TemplateGalleryModule