// ==UserScript==
// @name        文档在线预览与下载更名
// @namespace   Violentmonkey Scripts
// @match       *://*/*
// @grant       none
// @version     1.2
// @license MIT
// @description 2021/3/29 上午12:53:16
// @downloadURL none
// ==/UserScript==

/**
 * @file
 * Checks for document links in web pages and inserts
 * an icon beside the links to enable opening with
 * online services like Google Docs viewer.
 *
 * @author Deekshith Allamaneni
 * @copyright 2015 Docs Online Viewer
 */
!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):function(){const r=e.Base64,o=t();o.noConflict=()=>(e.Base64=r,o),e.Meteor&&(Base64=o),e.Base64=o}()}("undefined"!=typeof self?self:"undefined"!=typeof window?window:"undefined"!=typeof global?global:this,(function(){"use strict";const e="3.6.0",t="function"==typeof atob,r="function"==typeof btoa,o="function"==typeof Buffer,n="function"==typeof TextDecoder?new TextDecoder:void 0,a="function"==typeof TextEncoder?new TextEncoder:void 0,f=[..."ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="],i=(e=>{let t={};return e.forEach(((e,r)=>t[e]=r)),t})(f),c=/^(?:[A-Za-z\d+\/]{4})*?(?:[A-Za-z\d+\/]{2}(?:==)?|[A-Za-z\d+\/]{3}=?)?$/,u=String.fromCharCode.bind(String),s="function"==typeof Uint8Array.from?Uint8Array.from.bind(Uint8Array):(e,t=(e=>e))=>new Uint8Array(Array.prototype.slice.call(e,0).map(t)),d=e=>e.replace(/[+\/]/g,(e=>"+"==e?"-":"_")).replace(/=+$/m,""),l=e=>e.replace(/[^A-Za-z0-9\+\/]/g,""),h=e=>{let t,r,o,n,a="";const i=e.length%3;for(let i=0;i<e.length;){if((r=e.charCodeAt(i++))>255||(o=e.charCodeAt(i++))>255||(n=e.charCodeAt(i++))>255)throw new TypeError("invalid character found");t=r<<16|o<<8|n,a+=f[t>>18&63]+f[t>>12&63]+f[t>>6&63]+f[63&t]}return i?a.slice(0,i-3)+"===".substring(i):a},p=r?e=>btoa(e):o?e=>Buffer.from(e,"binary").toString("base64"):h,y=o?e=>Buffer.from(e).toString("base64"):e=>{let t=[];for(let r=0,o=e.length;r<o;r+=4096)t.push(u.apply(null,e.subarray(r,r+4096)));return p(t.join(""))},A=(e,t=!1)=>t?d(y(e)):y(e),b=e=>{if(e.length<2)return(t=e.charCodeAt(0))<128?e:t<2048?u(192|t>>>6)+u(128|63&t):u(224|t>>>12&15)+u(128|t>>>6&63)+u(128|63&t);var t=65536+1024*(e.charCodeAt(0)-55296)+(e.charCodeAt(1)-56320);return u(240|t>>>18&7)+u(128|t>>>12&63)+u(128|t>>>6&63)+u(128|63&t)},g=/[\uD800-\uDBFF][\uDC00-\uDFFFF]|[^\x00-\x7F]/g,B=e=>e.replace(g,b),x=o?e=>Buffer.from(e,"utf8").toString("base64"):a?e=>y(a.encode(e)):e=>p(B(e)),C=(e,t=!1)=>t?d(x(e)):x(e),m=e=>C(e,!0),U=/[\xC0-\xDF][\x80-\xBF]|[\xE0-\xEF][\x80-\xBF]{2}|[\xF0-\xF7][\x80-\xBF]{3}/g,F=e=>{switch(e.length){case 4:var t=((7&e.charCodeAt(0))<<18|(63&e.charCodeAt(1))<<12|(63&e.charCodeAt(2))<<6|63&e.charCodeAt(3))-65536;return u(55296+(t>>>10))+u(56320+(1023&t));case 3:return u((15&e.charCodeAt(0))<<12|(63&e.charCodeAt(1))<<6|63&e.charCodeAt(2));default:return u((31&e.charCodeAt(0))<<6|63&e.charCodeAt(1))}},w=e=>e.replace(U,F),S=e=>{if(e=e.replace(/\s+/g,""),!c.test(e))throw new TypeError("malformed base64.");e+="==".slice(2-(3&e.length));let t,r,o,n="";for(let a=0;a<e.length;)t=i[e.charAt(a++)]<<18|i[e.charAt(a++)]<<12|(r=i[e.charAt(a++)])<<6|(o=i[e.charAt(a++)]),n+=64===r?u(t>>16&255):64===o?u(t>>16&255,t>>8&255):u(t>>16&255,t>>8&255,255&t);return n},E=t?e=>atob(l(e)):o?e=>Buffer.from(e,"base64").toString("binary"):S,v=o?e=>s(Buffer.from(e,"base64")):e=>s(E(e),(e=>e.charCodeAt(0))),D=e=>v(z(e)),R=o?e=>Buffer.from(e,"base64").toString("utf8"):n?e=>n.decode(v(e)):e=>w(E(e)),z=e=>l(e.replace(/[-_]/g,(e=>"-"==e?"+":"/"))),T=e=>R(z(e)),Z=e=>({value:e,enumerable:!1,writable:!0,configurable:!0}),j=function(){const e=(e,t)=>Object.defineProperty(String.prototype,e,Z(t));e("fromBase64",(function(){return T(this)})),e("toBase64",(function(e){return C(this,e)})),e("toBase64URI",(function(){return C(this,!0)})),e("toBase64URL",(function(){return C(this,!0)})),e("toUint8Array",(function(){return D(this)}))},I=function(){const e=(e,t)=>Object.defineProperty(Uint8Array.prototype,e,Z(t));e("toBase64",(function(e){return A(this,e)})),e("toBase64URI",(function(){return A(this,!0)})),e("toBase64URL",(function(){return A(this,!0)}))},O={version:e,VERSION:"3.6.0",atob:E,atobPolyfill:S,btoa:p,btoaPolyfill:h,fromBase64:T,toBase64:C,encode:C,encodeURI:m,encodeURL:m,utob:B,btou:w,decode:T,isValid:e=>{if("string"!=typeof e)return!1;const t=e.replace(/\s+/g,"").replace(/=+$/,"");return!/[^\s0-9a-zA-Z\+/]/.test(t)||!/[^\s0-9a-zA-Z\-_]/.test(t)},fromUint8Array:A,toUint8Array:D,extendString:j,extendUint8Array:I,extendBuiltins:()=>{j(),I()},Base64:{}};return Object.keys(O).forEach((e=>O.Base64[e]=O[e])),O}));

(function(){
var docLinks = document.links;
const supportedFileExtList = ["pdf","doc","docx","xls","xlsx","ppt","pps","pptx","xps","odt","odp","rtf","ods","wpd"];
var doCheck = true;
const dov_host_exclude =/(docs\.google\.com|sourceforge\.net|adf\.ly|mediafire\.com|springerlink\.com|ziddu\.com|ieee\.org|issuu\.com|asaha\.com|office\.live\.com)$/
// Include paths to exclude showing icon
const dov_href_exclude = /(https:\/\/github.com\/.*\/.*\/blob\/.*|file:\/\/\/.*)/ 
const dovIconImgPath = "https://dov.parishod.com/assets/images/beside-link-icon.svg";


var DocLink = function (docLink) {
    this._docLink = docLink;
};
DocLink.prototype = {
    get hasSupportedExtension () {
        return supportedFileExtList.some( thisFileType => {
            var url = this._docLink.pathname.toLowerCase();
            if (url.endsWith('.' + thisFileType))
                return true;
        });
    },
    get isSupported () {
        return (!((this._docLink.host).match(dov_host_exclude)) 
            && !((this._docLink.href).match(dov_href_exclude)) 
            && this.hasSupportedExtension
            && this._docLink.textContent.trim().length > 0); // Issue #6: No blank innerText
    },
    get isProcessed () {
        return this._docLink.docView;
    },
    get iconLink () { 
        var viewLink = document.createElement('a');
        //1号备用：经常失效viewLink.href = `http://view.xdocin.com/xdoc?_xdoc=${encodeURIComponent(this._docLink.href)}`;
       //2号备用：谷歌预览 viewLink.href = `https://docs.google.com/viewer?url=${encodeURIComponent(this._docLink.href)}&embedded=true`;
      //3号备用：url后面的部分需要base64编码，没写好：viewLink.href = 'https://file.keking.cn/onlinePreview?url='+encodeURIComponent(Base64.encode(this._docLink.href));
       viewLink.href = `https://view.officeapps.live.com/op/view.aspx?src=${encodeURIComponent(this._docLink.href)}`;
      /*
            Parameter description:
                embedded= <true>: to open google docs in embedded mode
                dov=1: If opened by Docs Online Viewer. Set by this script.
        */
        //viewLink.docView=true; -> This line is removed in this version but still doubt if it can really be removed.
        viewLink.title=`View this in Office`;
        var ico = document.createElement("img");
        ico.src =  "https://raw.githubusercontent.com/adeekshith/Docs-Online-Viewer/165389071f4c792241c4d7d4079d103369e413f7/src/images/beside-link-icon.svg";
        // Adjusts the margin of the icon to the given number of pixels (3 to 5px is advisable)
        ico.style.marginLeft = "3px";
        ico.style.width = "16px";
        ico.style.height = "16px";
        viewLink.appendChild(ico);
        // Disabled opening link in new tab by default.
        viewLink.setAttribute("target", "_blank");
        return viewLink;
    },
  get iconLink2 () { 
        var viewLink = document.createElement('a');
       viewLink.href = 'https://file.keking.cn/onlinePreview?url='+encodeURIComponent(Base64.encode(this._docLink.href));
    //上面这个目前是2号备用
        viewLink.title=`View this in Xdoc`;
        var ico = document.createElement("img");
        ico.src =  "https://raw.githubusercontent.com/adeekshith/Docs-Online-Viewer/165389071f4c792241c4d7d4079d103369e413f7/src/images/beside-link-icon.svg";
        ico.style.marginLeft = "3px";
        ico.style.width = "16px";
        ico.style.height = "16px";
        viewLink.appendChild(ico);
        viewLink.setAttribute("target", "_blank");
        return viewLink;
    },
    get fileExtension () {
        var fUrl = this._docLink.pathname;
        //fUrl=fUrl.toUpperCase();
        // Returns file extension. Returns "" if no valid extension
        // Ref: http://stackoverflow.com/a/1203361/3439460
        return fUrl.substr((~-fUrl.lastIndexOf(".") >>> 0) + 2);
    },
    get queryStripped() {
        // remove any ?query in the URL     
        return `${this._docLink.origin}${this._docLink.pathname}`;
    }

};


function checkLinks()
{
    for (var i = 0; i < docLinks.length; ++i) 
    {
        var thisDocLink = new DocLink(docLinks[i]);
        if ( thisDocLink.isSupported && !thisDocLink.isProcessed) 
        {
          //console.log("find a link to change!");
          //docLinks[i].download=docLinks[i].text+docLinks[i].href.substring(docLinks[i].href.lastIndexOf("."));
          docLinks[i].download=docLinks[i].text+"."+thisDocLink.fileExtension;
          console.log("修改下载文件名为:"+docLinks[i].download);
          //上两行是我加的，用于把下载文件名改为链接文字加扩展名，因为原先的下载文件名总是全数字
          if ( thisDocLink.fileExtension !== "pdf") {
            docLinks[i].parentNode.insertBefore(thisDocLink.iconLink2 , docLinks[i].nextSibling);
          docLinks[i].parentNode.insertBefore(thisDocLink.iconLink , docLinks[i].nextSibling); 
          // Append the icon beside the link,pdf除外
          }
        }
    // The link which is checked is flagged so that it is not repeatedly checked again.
    docLinks[i].docView=true;
   }
}

// Execute these functions
// to append icon beside document links and
// add listener for new nodes
checkLinks();

    // create an observer instance
    var observer = new MutationObserver(function(mutations) {
        mutations.forEach(function(mutation) {
            if (doCheck)
            {
                doCheck = false;
                setTimeout(function(){checkLinks();doCheck = true;}, 1000);
            }
        });
    });

    // pass in the target node, as well as the observer options
    observer.observe(document.body, {
        attributes: true,
        childList: true,
        characterData: true,
        subtree:true
    });
})();