preview.document.js

const md = require('markdown-it')()

const qs = require('querystring')

const urlFormat = require('url').format


/*
 * 文档在线预览插件
 */
const name = 'documentParse'

const version = '1.0'

module.exports = ({ getSource , getConfig, request }) => {

  const fileMap = {}

  const markdown = async (data, req) => {
    let html = md.render(await getSource(data.id , data.protocol , data));
    //<iframe style="width:auto;height:auto;"></iframe><script>document.querySelector("iframe").contentWindow.document.write(`'+html+'`);</script>
    return {
      ...data,
      body: '<link href="https://cdn.bootcss.com/github-markdown-css/3.0.1/github-markdown.min.css" rel="stylesheet"><article class="markdown-body" style="text-align:left;padding:16px;" itemprop="text">'+html+'</article>'
    }
  }

  const txt = async (data ,req) => {
    if(data.size && data.size > 512 * 1000){
      return {
        ...data,
        body:'<p style="margin:16px;font-size:13px;">内容过大，请直接下载</p>'
      }
    }

    let html = await getSource(data.id , data.protocol, data)
    return {
      ...data,
      body: '<link href="https://cdn.bootcss.com/github-markdown-css/3.0.1/github-markdown.min.css" rel="stylesheet"><article class="markdown-body" style="text-align:left;padding:16px;" itemprop="text"><p style="font-size:13px;line-height:1.8em;">'+html+'</p></article>'
    }
  }

  const createUrl = (req , withToken = false , append = {}) => {
    let query = { ...append }
    if(withToken){
      query.token = getConfig('token')
    }
    let querystr = qs.stringify(query)
    return req.origin + req.path + ( querystr ? ('?' + querystr) : '')
  }


  const office = async (data, req) => {
    if( req.query.conv && fileMap[req.path]){
      let url = fileMap[req.path]
      delete fileMap[req.path]
      return {
        ...data,
        convertible:true,
        outputType:'stream',
        body:request({url})
      }
    }

    let rawUrl = createUrl(req,true)
    let WOPISrc = encodeURIComponent(`http://us1-view-wopi.wopi.live.net:808/oh/wopi/files/@/wFileId?wFileId=${encodeURIComponent(rawUrl)}`)
    let url = `https://us1-word-view.officeapps.live.com/wv/wordviewerframe.aspx?ui=zh-CN&rs=zh-CN&WOPISrc=${WOPISrc}&access_token_ttl=0`

    let resp = await request.get(url,{ headers:{'User-Agent':'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36'}})

    let previewUrl
    if(resp.body){
      let z = (resp.body.match(/(?<=z\=)[a-z0-9]+?(?=\')/i) || [''])[0]
      if(z){
        previewUrl = `https://us1-word-view.officeapps.live.com/wv/WordViewer/Document.pdf?WOPIsrc=${WOPISrc}&access_token=1&access_token_ttl=0&z=${z}&type=accesspdf`
      }
    }

    if(previewUrl) {
      fileMap[req.path] = previewUrl
      let url = createUrl(req , false , { preview:1, conv: 1})
      let body = `<iframe src="//mozilla.github.io/pdf.js/es5/web/viewer.html?file=${encodeURIComponent(url)}"></iframe>`
      return {
        ...data,
        convertible:true,
        body
      }
      
    }else{
      return { 
        ...data,
        convertible:true,
        body:'无法预览'
      }
    }
    
  }

  const pdf = async (data , req) => {
    if( req.query.proxy ){
      return {
        ...data,
        convertible:true,
        outputType:'stream',
        body:request({url:createUrl(req , true)})
      }
    }
    let url = createUrl(req , false , { preview:1, proxy : 1 })
    return {
      ...data,
      // outputType:'stream',
      body:`
        <div class="preview_container"><link rel="stylesheet" href="//mozilla.github.io/pdf.js/es5/web/viewer.css"><style type="text/css">#viewerContainer * {box-sizing: content-box;}</style>s<link rel="resource" type="application/l10n" href="https://mozilla.github.io/pdf.js/es5/web/locale/locale.properties"><script src="https://mozilla.github.io/pdf.js/es5/build/pdf.js"></script><script src="https://mozilla.github.io/pdf.js/es5/build/pdf.worker.js"></script><script>    document.addEventListener("webviewerloaded", function() {      PDFViewerApplicationOptions.set("workerSrc", "https://mozilla.github.io/pdf.js/es5/build/pdf.worker.js");PDFViewerApplicationOptions.set("defaultUrl", "${url}");    });</script><script src="https://mozilla.github.io/pdf.js/es5/web/viewer.js"></script><section tabindex="1" class="loadingInProgress"><div id="outerContainer"><div id="sidebarContainer"><div id="toolbarSidebar"><div class="splitToolbarButton toggled"><button id="viewThumbnail" class="toolbarButton toggled" title="Show Thumbnails" tabindex="2" data-l10n-id="thumbs"><span data-l10n-id="thumbs_label">Thumbnails</span></button><button id="viewOutline" class="toolbarButton" title="Show Document Outline (double-click to expand/collapse all items)" tabindex="3" data-l10n-id="document_outline"><span data-l10n-id="document_outline_label">Document Outline</span></button><button id="viewAttachments" class="toolbarButton" title="Show Attachments" tabindex="4" data-l10n-id="attachments"><span data-l10n-id="attachments_label">Attachments</span></button></div></div><div id="sidebarContent"><div id="thumbnailView"></div><div id="outlineView" class="hidden"></div><div id="attachmentsView" class="hidden"></div></div><div id="sidebarResizer" class="hidden"></div></div><div id="mainContainer"><div class="findbar hidden doorHanger" id="findbar"><div id="findbarInputContainer"><input id="findInput" class="toolbarField" title="Find" placeholder="Find in document…" tabindex="91" data-l10n-id="find_input"><div class="splitToolbarButton"><button id="findPrevious" class="toolbarButton findPrevious" title="Find the previous occurrence of the phrase" tabindex="92" data-l10n-id="find_previous"><span data-l10n-id="find_previous_label">Previous</span></button><div class="splitToolbarButtonSeparator"></div><button id="findNext" class="toolbarButton findNext" title="Find the next occurrence of the phrase" tabindex="93" data-l10n-id="find_next"><span data-l10n-id="find_next_label">Next</span></button></div></div><div id="findbarOptionsOneContainer"><input type="checkbox" id="findHighlightAll" class="toolbarField" tabindex="94"><label for="findHighlightAll" class="toolbarLabel" data-l10n-id="find_highlight">Highlight all</label><input type="checkbox" id="findMatchCase" class="toolbarField" tabindex="95"><label for="findMatchCase" class="toolbarLabel" data-l10n-id="find_match_case_label">Match case</label></div><div id="findbarOptionsTwoContainer"><input type="checkbox" id="findEntireWord" class="toolbarField" tabindex="96"><label for="findEntireWord" class="toolbarLabel" data-l10n-id="find_entire_word_label">Whole words</label><span id="findResultsCount" class="toolbarLabel hidden"></span></div><div id="findbarMessageContainer"><span id="findMsg" class="toolbarLabel"></span></div></div><div id="secondaryToolbar" class="secondaryToolbar hidden doorHangerRight"><div id="secondaryToolbarButtonContainer"><button id="secondaryPresentationMode" class="secondaryToolbarButton presentationMode visibleLargeView" title="Switch to Presentation Mode" tabindex="51" data-l10n-id="presentation_mode"><span data-l10n-id="presentation_mode_label">Presentation Mode</span></button><button id="secondaryOpenFile" class="secondaryToolbarButton openFile visibleLargeView" title="Open File" tabindex="52" data-l10n-id="open_file"><span data-l10n-id="open_file_label">Open</span></button><button id="secondaryPrint" class="secondaryToolbarButton print visibleMediumView" title="Print" tabindex="53" data-l10n-id="print"><span data-l10n-id="print_label">Print</span></button><button id="secondaryDownload" class="secondaryToolbarButton download visibleMediumView" title="Download" tabindex="54" data-l10n-id="download"><span data-l10n-id="download_label">Download</span></button><a href="#" id="secondaryViewBookmark" class="secondaryToolbarButton bookmark visibleSmallView" title="Current view (copy or open in new window)" tabindex="55" data-l10n-id="bookmark"><span data-l10n-id="bookmark_label">Current View</span></a><div class="horizontalToolbarSeparator visibleLargeView"></div><button id="firstPage" class="secondaryToolbarButton firstPage" title="Go to First Page" tabindex="56" data-l10n-id="first_page"><span data-l10n-id="first_page_label">Go to First Page</span></button><button id="lastPage" class="secondaryToolbarButton lastPage" title="Go to Last Page" tabindex="57" data-l10n-id="last_page"><span data-l10n-id="last_page_label">Go to Last Page</span></button><div class="horizontalToolbarSeparator"></div><button id="pageRotateCw" class="secondaryToolbarButton rotateCw" title="Rotate Clockwise" tabindex="58" data-l10n-id="page_rotate_cw"><span data-l10n-id="page_rotate_cw_label">Rotate Clockwise</span></button><button id="pageRotateCcw" class="secondaryToolbarButton rotateCcw" title="Rotate Counterclockwise" tabindex="59" data-l10n-id="page_rotate_ccw"><span data-l10n-id="page_rotate_ccw_label">Rotate Counterclockwise</span></button><div class="horizontalToolbarSeparator"></div><button id="cursorSelectTool" class="secondaryToolbarButton selectTool toggled" title="Enable Text Selection Tool" tabindex="60" data-l10n-id="cursor_text_select_tool"><span data-l10n-id="cursor_text_select_tool_label">Text Selection Tool</span></button><button id="cursorHandTool" class="secondaryToolbarButton handTool" title="Enable Hand Tool" tabindex="61" data-l10n-id="cursor_hand_tool"><span data-l10n-id="cursor_hand_tool_label">Hand Tool</span></button><div class="horizontalToolbarSeparator"></div><button id="scrollVertical" class="secondaryToolbarButton scrollModeButtons scrollVertical toggled" title="Use Vertical Scrolling" tabindex="62" data-l10n-id="scroll_vertical"><span data-l10n-id="scroll_vertical_label">Vertical Scrolling</span></button><button id="scrollHorizontal" class="secondaryToolbarButton scrollModeButtons scrollHorizontal" title="Use Horizontal Scrolling" tabindex="63" data-l10n-id="scroll_horizontal"><span data-l10n-id="scroll_horizontal_label">Horizontal Scrolling</span></button><button id="scrollWrapped" class="secondaryToolbarButton scrollModeButtons scrollWrapped" title="Use Wrapped Scrolling" tabindex="64" data-l10n-id="scroll_wrapped"><span data-l10n-id="scroll_wrapped_label">Wrapped Scrolling</span></button><div class="horizontalToolbarSeparator scrollModeButtons"></div><button id="spreadNone" class="secondaryToolbarButton spreadModeButtons spreadNone toggled" title="Do not join page spreads" tabindex="65" data-l10n-id="spread_none"><span data-l10n-id="spread_none_label">No Spreads</span></button><button id="spreadOdd" class="secondaryToolbarButton spreadModeButtons spreadOdd" title="Join page spreads starting with odd-numbered pages" tabindex="66" data-l10n-id="spread_odd"><span data-l10n-id="spread_odd_label">Odd Spreads</span></button><button id="spreadEven" class="secondaryToolbarButton spreadModeButtons spreadEven" title="Join page spreads starting with even-numbered pages" tabindex="67" data-l10n-id="spread_even"><span data-l10n-id="spread_even_label">Even Spreads</span></button><div class="horizontalToolbarSeparator spreadModeButtons"></div><button id="documentProperties" class="secondaryToolbarButton documentProperties" title="Document Properties…" tabindex="68" data-l10n-id="document_properties"><span data-l10n-id="document_properties_label">Document Properties…</span></button></div></div><div class="toolbar"><div id="toolbarContainer"><div id="toolbarViewer"><div id="toolbarViewerLeft"><button id="sidebarToggle" class="toolbarButton" title="Toggle Sidebar" tabindex="11" data-l10n-id="toggle_sidebar"><span data-l10n-id="toggle_sidebar_label">Toggle Sidebar</span></button><div class="toolbarButtonSpacer"></div><button id="viewFind" class="toolbarButton" title="Find in Document" tabindex="12" data-l10n-id="findbar"><span data-l10n-id="findbar_label">Find</span></button><div class="splitToolbarButton hiddenSmallView"><button class="toolbarButton pageUp" title="Previous Page" id="previous" tabindex="13" data-l10n-id="previous"><span data-l10n-id="previous_label">Previous</span></button><div class="splitToolbarButtonSeparator"></div><button class="toolbarButton pageDown" title="Next Page" id="next" tabindex="14" data-l10n-id="next"><span data-l10n-id="next_label">Next</span></button></div><input type="number" id="pageNumber" class="toolbarField pageNumber" title="Page" value="1" size="4" min="1" tabindex="15" data-l10n-id="page" autocomplete="off"><span id="numPages" class="toolbarLabel"></span></div><div id="toolbarViewerRight"><button id="presentationMode" class="toolbarButton presentationMode hiddenLargeView" title="Switch to Presentation Mode" tabindex="31" data-l10n-id="presentation_mode"><span data-l10n-id="presentation_mode_label">Presentation Mode</span></button><button id="openFile" class="toolbarButton openFile hiddenLargeView" title="Open File" tabindex="32" data-l10n-id="open_file"><span data-l10n-id="open_file_label">Open</span></button><button id="print" class="toolbarButton print hiddenMediumView" title="Print" tabindex="33" data-l10n-id="print"><span data-l10n-id="print_label">Print</span></button><button id="download" class="toolbarButton download hiddenMediumView" title="Download" tabindex="34" data-l10n-id="download"><span data-l10n-id="download_label">Download</span></button><a href="#" id="viewBookmark" class="toolbarButton bookmark hiddenSmallView" title="Current view (copy or open in new window)" tabindex="35" data-l10n-id="bookmark"><span data-l10n-id="bookmark_label">Current View</span></a><div class="verticalToolbarSeparator hiddenSmallView"></div><button id="secondaryToolbarToggle" class="toolbarButton" title="Tools" tabindex="36" data-l10n-id="tools"><span data-l10n-id="tools_label">Tools</span></button></div><div id="toolbarViewerMiddle"><div class="splitToolbarButton"><button id="zoomOut" class="toolbarButton zoomOut" title="Zoom Out" tabindex="21" data-l10n-id="zoom_out"><span data-l10n-id="zoom_out_label">Zoom Out</span></button><div class="splitToolbarButtonSeparator"></div><button id="zoomIn" class="toolbarButton zoomIn" title="Zoom In" tabindex="22" data-l10n-id="zoom_in"><span data-l10n-id="zoom_in_label">Zoom In</span></button></div><span id="scaleSelectContainer" class="dropdownToolbarButton"><select id="scaleSelect" title="Zoom" tabindex="23" data-l10n-id="zoom"><option id="pageAutoOption" title="" value="auto" selected="selected" data-l10n-id="page_scale_auto">Automatic Zoom</option><option id="pageActualOption" title="" value="page-actual" data-l10n-id="page_scale_actual">Actual Size</option><option id="pageFitOption" title="" value="page-fit" data-l10n-id="page_scale_fit">Page Fit</option><option id="pageWidthOption" title="" value="page-width" data-l10n-id="page_scale_width">Page Width</option><option id="customScaleOption" title="" value="custom" disabled="disabled" hidden="true"></option><option title="" value="0.5" data-l10n-id="page_scale_percent" data-l10n-args='{ "scale": 50 }'>50%</option><option title="" value="0.75" data-l10n-id="page_scale_percent" data-l10n-args='{ "scale": 75 }'>75%</option><option title="" value="1" data-l10n-id="page_scale_percent" data-l10n-args='{ "scale": 100 }'>100%</option><option title="" value="1.25" data-l10n-id="page_scale_percent" data-l10n-args='{ "scale": 125 }'>125%</option><option title="" value="1.5" data-l10n-id="page_scale_percent" data-l10n-args='{ "scale": 150 }'>150%</option><option title="" value="2" data-l10n-id="page_scale_percent" data-l10n-args='{ "scale": 200 }'>200%</option><option title="" value="3" data-l10n-id="page_scale_percent" data-l10n-args='{ "scale": 300 }'>300%</option><option title="" value="4" data-l10n-id="page_scale_percent" data-l10n-args='{ "scale": 400 }'>400%</option></select></span></div></div><div id="loadingBar"><div class="progress"><div class="glimmer"></div></div></div></div></div><menu type="context" id="viewerContextMenu"><menuitem id="contextFirstPage" label="First Page"                    data-l10n-id="first_page"></menuitem><menuitem id="contextLastPage" label="Last Page"                    data-l10n-id="last_page"></menuitem><menuitem id="contextPageRotateCw" label="Rotate Clockwise"                    data-l10n-id="page_rotate_cw"></menuitem><menuitem id="contextPageRotateCcw" label="Rotate Counter-Clockwise"                    data-l10n-id="page_rotate_ccw"></menuitem></menu><div id="viewerContainer" tabindex="0"><div id="viewer" class="pdfViewer"></div></div><div id="errorWrapper" hidden='true'><div id="errorMessageLeft"><span id="errorMessage"></span><button id="errorShowMore" data-l10n-id="error_more_info">              More Information</button><button id="errorShowLess" data-l10n-id="error_less_info" hidden='true'>              Less Information</button></div><div id="errorMessageRight"><button id="errorClose" data-l10n-id="error_close">              Close</button></div><div class="clearBoth"></div><textarea id="errorMoreInfo" hidden='true' readonly="readonly"></textarea></div></div><div id="overlayContainer" class="hidden"><div id="passwordOverlay" class="container hidden"><div class="dialog"><div class="row"><p id="passwordText" data-l10n-id="password_label">Enter the password to open this PDF file:</p></div><div class="row"><input type="password" id="password" class="toolbarField"></div><div class="buttonRow"><button id="passwordCancel" class="overlayButton"><span data-l10n-id="password_cancel">Cancel</span></button><button id="passwordSubmit" class="overlayButton"><span data-l10n-id="password_ok">OK</span></button></div></div></div><div id="documentPropertiesOverlay" class="container hidden"><div class="dialog"><div class="row"><span data-l10n-id="document_properties_file_name">File name:</span><p id="fileNameField">-</p></div><div class="row"><span data-l10n-id="document_properties_file_size">File size:</span><p id="fileSizeField">-</p></div><div class="separator"></div><div class="row"><span data-l10n-id="document_properties_title">Title:</span><p id="titleField">-</p></div><div class="row"><span data-l10n-id="document_properties_author">Author:</span><p id="authorField">-</p></div><div class="row"><span data-l10n-id="document_properties_subject">Subject:</span><p id="subjectField">-</p></div><div class="row"><span data-l10n-id="document_properties_keywords">Keywords:</span><p id="keywordsField">-</p></div><div class="row"><span data-l10n-id="document_properties_creation_date">Creation Date:</span><p id="creationDateField">-</p></div><div class="row"><span data-l10n-id="document_properties_modification_date">Modification Date:</span><p id="modificationDateField">-</p></div><div class="row"><span data-l10n-id="document_properties_creator">Creator:</span><p id="creatorField">-</p></div><div class="separator"></div><div class="row"><span data-l10n-id="document_properties_producer">PDF Producer:</span><p id="producerField">-</p></div><div class="row"><span data-l10n-id="document_properties_version">PDF Version:</span><p id="versionField">-</p></div><div class="row"><span data-l10n-id="document_properties_page_count">Page Count:</span><p id="pageCountField">-</p></div><div class="row"><span data-l10n-id="document_properties_page_size">Page Size:</span><p id="pageSizeField">-</p></div><div class="separator"></div><div class="row"><span data-l10n-id="document_properties_linearized">Fast Web View:</span><p id="linearizedField">-</p></div><div class="buttonRow"><button id="documentPropertiesClose" class="overlayButton"><span data-l10n-id="document_properties_close">Close</span></button></div></div></div><div id="printServiceOverlay" class="container hidden"><div class="dialog"><div class="row"><span data-l10n-id="print_progress_message">Preparing document for printing…</span></div><div class="row"><progress value="0" max="100"></progress><span data-l10n-id="print_progress_percent" data-l10n-args='{ "progress": 0 }' class="relative-progress">0%</span></div><div class="buttonRow"><button id="printCancel" class="overlayButton"><span data-l10n-id="print_progress_close">Cancel</span></button></div></div></div></div></div><div id="printContainer"></div></section></div>
      `
    }
  }

  const preview = {};

  ['md'].forEach(ext => {
    preview[ext] = markdown
  });
  ['txt'].forEach(ext => {
    preview[ext] = txt
  });
  ['doc', 'docx', 'ppt', 'pptx', 'xls', 'xlsx'].forEach(ext => {
    preview[ext] = office
  });

  ['pdf'].forEach(ext => {
    preview[ext] = pdf
  })

  return { name, version, preview }
}