worker.js

self.props = {
	title: 'GDIndex',
	default_root_id: 'root',
	client_id: '202264815644.apps.googleusercontent.com',
	client_secret: 'X4Z3ca8xfWDb1Voo-F9a7ZxJ',
	refresh_token: '',
	auth: false,
	user: '',
	pass: '',
	upload: false,
	lite: false
};
(function () {
  'use strict';

  /**
   * @param typeMap [Object] Map of MIME type -> Array[extensions]
   * @param ...
   */
  function Mime() {
    this._types = Object.create(null);
    this._extensions = Object.create(null);

    for (var i = 0; i < arguments.length; i++) {
      this.define(arguments[i]);
    }

    this.define = this.define.bind(this);
    this.getType = this.getType.bind(this);
    this.getExtension = this.getExtension.bind(this);
  }

  /**
   * Define mimetype -> extension mappings.  Each key is a mime-type that maps
   * to an array of extensions associated with the type.  The first extension is
   * used as the default extension for the type.
   *
   * e.g. mime.define({'audio/ogg', ['oga', 'ogg', 'spx']});
   *
   * If a type declares an extension that has already been defined, an error will
   * be thrown.  To suppress this error and force the extension to be associated
   * with the new type, pass `force`=true.  Alternatively, you may prefix the
   * extension with "*" to map the type to extension, without mapping the
   * extension to the type.
   *
   * e.g. mime.define({'audio/wav', ['wav']}, {'audio/x-wav', ['*wav']});
   *
   *
   * @param map (Object) type definitions
   * @param force (Boolean) if true, force overriding of existing definitions
   */
  Mime.prototype.define = function(typeMap, force) {
    for (var type in typeMap) {
      var extensions = typeMap[type].map(function(t) {return t.toLowerCase()});
      type = type.toLowerCase();

      for (var i = 0; i < extensions.length; i++) {
        var ext = extensions[i];

        // '*' prefix = not the preferred type for this extension.  So fixup the
        // extension, and skip it.
        if (ext[0] == '*') {
          continue;
        }

        if (!force && (ext in this._types)) {
          throw new Error(
            'Attempt to change mapping for "' + ext +
            '" extension from "' + this._types[ext] + '" to "' + type +
            '". Pass `force=true` to allow this, otherwise remove "' + ext +
            '" from the list of extensions for "' + type + '".'
          );
        }

        this._types[ext] = type;
      }

      // Use first extension as default
      if (force || !this._extensions[type]) {
        var ext = extensions[0];
        this._extensions[type] = (ext[0] != '*') ? ext : ext.substr(1);
      }
    }
  };

  /**
   * Lookup a mime type based on extension
   */
  Mime.prototype.getType = function(path) {
    path = String(path);
    var last = path.replace(/^.*[/\\]/, '').toLowerCase();
    var ext = last.replace(/^.*\./, '').toLowerCase();

    var hasPath = last.length < path.length;
    var hasDot = ext.length < last.length - 1;

    return (hasDot || !hasPath) && this._types[ext] || null;
  };

  /**
   * Return file extension associated with a mime type
   */
  Mime.prototype.getExtension = function(type) {
    type = /^\s*([^;\s]*)/.test(type) && RegExp.$1;
    return type && this._extensions[type.toLowerCase()] || null;
  };

  var Mime_1 = Mime;

  var standard = 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  var other = 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:["wmv"],"video/x-ms-wmx":["wmx"],"video/x-ms-wvx":["wvx"],"video/x-msvideo":["avi"],"video/x-sgi-movie":["movie"],"video/x-smv":["smv"],"x-conference/x-cooltalk":["ice"]};

  var mime = new Mime_1(standard, other);

  /*
   * XFetch.js modified
   * A extremely simple fetch extension inspired by sindresorhus/ky.
   */
  const xf = (() => {
    const METHODS = ['get', 'post', 'put', 'patch', 'delete', 'head'];

    class HTTPError extends Error {
      constructor(res) {
        super(res.statusText);
        this.name = 'HTTPError';
        this.response = res;
      }

    }

    class XResponsePromise extends Promise {}

    for (const alias of ['arrayBuffer', 'blob', 'formData', 'json', 'text']) {
      // alias for .json() .text() etc...
      XResponsePromise.prototype[alias] = function (fn) {
        return this.then(res => res[alias]()).then(fn || (x => x));
      };
    }

    const {
      assign
    } = Object;

    function mergeDeep(target, source) {
      const isObject = obj => obj && typeof obj === 'object';

      if (!isObject(target) || !isObject(source)) {
        return source;
      }

      Object.keys(source).forEach(key => {
        const targetValue = target[key];
        const sourceValue = source[key];

        if (Array.isArray(targetValue) && Array.isArray(sourceValue)) {
          target[key] = targetValue.concat(sourceValue);
        } else if (isObject(targetValue) && isObject(sourceValue)) {
          target[key] = mergeDeep(Object.assign({}, targetValue), sourceValue);
        } else {
          target[key] = sourceValue;
        }
      });
      return target;
    }

    const fromEntries = ent => ent.reduce((acc, [k, v]) => (acc[k] = v, acc), {});

    const typeis = (...types) => val => types.some(type => typeof type === 'string' ? typeof val === type : val instanceof type);

    const isstr = typeis('string');
    const isobj = typeis('object');

    const isstrorobj = v => isstr(v) || isobj(v);

    const responseErrorThrower = res => {
      if (!res.ok) throw new HTTPError(res);
      return res;
    };

    const extend = (defaultInit = {}) => {
      const xfetch = (input, init = {}) => {
        mergeDeep(init, defaultInit);

        const createQueryString = o => new init.URLSearchParams(o).toString();

        const parseQueryString = s => fromEntries([...new init.URLSearchParams(s).entries()]);

        const url = new init.URL(input, init.baseURI || undefined);

        if (!init.headers) {
          init.headers = {};
        } else if (typeis(init.Headers)(init.headers)) {
          // Transform into object if it is `Headers`
          init.headers = fromEntries([...init.headers.entries()]);
        } // Add json or form on body


        if (init.json) {
          init.body = JSON.stringify(init.json);
          init.headers['Content-Type'] = 'application/json';
        } else if (isstrorobj(init.urlencoded)) {
          init.body = isstr(init.urlencoded) ? init.urlencoded : createQueryString(init.urlencoded);
          init.headers['Content-Type'] = 'application/x-www-form-urlencoded';
        } else if (typeis(init.FormData, 'object')(init.formData)) {
          // init.formData is data passed by user, init.FormData is FormData constructor
          if (!typeis(init.FormData)(init.formData)) {
            const fd = new init.FormData();

            for (const [k, v] of Object.entries(init.formData)) {
              fd.append(k, v);
            }

            init.formData = fd;
          }

          init.body = init.formData;
        } // Querystring


        if (init.qs) {
          if (isstr(init.qs)) init.qs = parseQueryString(init.qs);
          url.search = createQueryString(assign(fromEntries([...url.searchParams.entries()]), init.qs));
        }

        return XResponsePromise.resolve(init.fetch(url, init).then(responseErrorThrower));
      };

      for (const method of METHODS) {
        xfetch[method] = (input, init = {}) => {
          init.method = method.toUpperCase();
          return xfetch(input, init);
        };
      } // Extra methods and classes


      xfetch.extend = newDefaultInit => extend(assign({}, defaultInit, newDefaultInit));

      xfetch.HTTPError = HTTPError;
      return xfetch;
    };

    const isWindow = typeof document !== 'undefined';
    const isBrowser = typeof self !== 'undefined'; // works in both window & worker scope

    return isBrowser ? extend({
      fetch: fetch.bind(self),
      URL,
      Response,
      URLSearchParams,
      Headers,
      FormData,
      baseURI: isWindow ? document.baseURI : '' // since there is no document in webworkers

    }) : extend();
  })();

  class GoogleDrive {
    constructor(auth) {
      this.auth = auth;
      this.expires = 0;
      this._getIdCache = new Map();
    }

    async initializeClient() {
      // any method that do api call must call this beforehand
      if (Date.now() < this.expires) return;
      const resp = await xf.post('https://www.googleapis.com/oauth2/v4/token', {
        urlencoded: {
          client_id: this.auth.client_id,
          client_secret: this.auth.client_secret,
          refresh_token: this.auth.refresh_token,
          grant_type: 'refresh_token'
        }
      }).json();
      this.client = xf.extend({
        baseURI: 'https://www.googleapis.com/drive/v3/',
        headers: {
          Authorization: `Bearer ${resp.access_token}`
        }
      });
      this.expires = Date.now() + 3500 * 1000; // normally, it should expiers after 3600 seconds
    }

    async listDrive() {
      await this.initializeClient();
      return this.client.get('drives').json();
    }

    async download(id, range = '') {
      await this.initializeClient();
      return this.client.get(`files/${id}`, {
        qs: {
          includeItemsFromAllDrives: true,
          supportsAllDrives: true,
          alt: 'media'
        },
        headers: {
          Range: range
        }
      });
    }

    async downloadByPath(path, rootId = 'root', range = '') {
      const id = await this.getId(path, rootId);
      if (!id) return null;
      return this.download(id, range);
    }

    async getMeta(id) {
      await this.initializeClient();
      return this.client.get(`files/${id}`, {
        qs: {
          includeItemsFromAllDrives: true,
          supportsAllDrives: true,
          fields: '*'
        }
      }).json();
    }

    async getMetaByPath(path, rootId = 'root') {
      const id = await this.getId(path, rootId);
      if (!id) return null;
      return this.getMeta(id);
    }

    async listFolder(id) {
      await this.initializeClient();

      const getList = pageToken => {
        const qs = {
          includeItemsFromAllDrives: true,
          supportsAllDrives: true,
          q: `'${id}' in parents and trashed = false`,
          orderBy: 'folder,name,modifiedTime desc',
          fields: 'files(id,name,mimeType,size,modifiedTime),nextPageToken',
          pageSize: 1000
        };

        if (pageToken) {
          qs.pageToken = pageToken;
        }

        return this.client.get('files', {
          qs
        }).json();
      };

      const files = [];
      let pageToken;

      do {
        const resp = await getList(pageToken);
        files.push(...resp.files);
        pageToken = resp.nextPageToken;
      } while (pageToken);

      return {
        files
      };
    }

    async listFolderByPath(path, rootId = 'root') {
      const id = await this.getId(path, rootId);
      if (!id) return null;
      return this.listFolder(id);
    }

    async getId(path, rootId = 'root') {
      const toks = path.split('/').filter(Boolean);
      let id = rootId;

      for (const tok of toks) {
        id = await this._getId(id, tok);
      }

      return id;
    }

    async _getId(parentId, childName) {
      if (this._getIdCache.has(parentId + childName)) {
        return this._getIdCache.get(parentId + childName);
      }

      await this.initializeClient();
      childName = childName.replace(/\'/g, `\\'`); // escape single quote

      const resp = await this.client.get('files', {
        qs: {
          includeItemsFromAllDrives: true,
          supportsAllDrives: true,
          q: `'${parentId}' in parents and name = '${childName}'  and trashed = false`,
          fields: 'files(id)'
        }
      }).json().catch(e => ({
        files: []
      })); // if error, make it empty

      if (resp.files.length === 0) {
        return null;
      }

      this._getIdCache.has(parentId + childName);

      return resp.files[0].id; // when there are more than 1 items, simply return the first one
    }

    async upload(parentId, name, file) {
      await this.initializeClient();
      const createResp = await this.client.post('https://www.googleapis.com/upload/drive/v3/files', {
        qs: {
          uploadType: 'resumable',
          supportsAllDrives: true
        },
        json: {
          name,
          parents: [parentId]
        }
      });
      const putUrl = createResp.headers.get('Location');
      return this.client.put(putUrl, {
        body: file
      }).json();
    }

    async uploadByPath(path, name, file, rootId = 'root') {
      const id = await this.getId(path, rootId);
      if (!id) return null;
      return this.upload(id, name, file);
    }

    async delete(fileId) {
      return this.client.delete(`files/${fileId}`);
    }

    async deleteByPath(path, rootId = 'root') {
      const id = await this.getId(path, rootId);
      if (!id) return null;
      return this.delete(id);
    }

  }

  const gd = new GoogleDrive(self.props);
  const HTML = `<!DOCTYPE html><html lang=en><head><meta charset=utf-8><meta http-equiv=X-UA-Compatible content="IE=edge"><meta name=viewport content="width=device-width,initial-scale=1"><title>${self.props.title}</title><link href="/~_~_gdindex/resources/css/app.css" rel=stylesheet></head><body><script>window.props = { title: '${self.props.title}', default_root_id: '${self.props.default_root_id}', api: location.protocol + '//' + location.host, upload: ${self.props.upload} }<\/script><div id=app></div><script src="/~_~_gdindex/resources/js/app.js"><\/script></body></html>`;

  async function onGet(request) {
    let {
      pathname: path
    } = request;
    const rootId = request.searchParams.get('rootId') || self.props.default_root_id;

    if (path.startsWith('/~_~_gdindex/resources/')) {
      const remain = path.replace('/~_~_gdindex/resources/', '');
      const r = await fetch(`https://raw.githubusercontent.com/maple3142/GDIndex/master/web/dist/${remain}`);
      return new Response(r.body, {
        headers: {
          'Content-Type': mime.getType(remain) + '; charset=utf-8',
          'Cache-Control': 'max-age=600'
        }
      });
    } else if (path === '/~_~_gdindex/drives') {
      return new Response(JSON.stringify((await gd.listDrive())), {
        headers: {
          'Content-Type': 'application/json'
        }
      });
    } else if (path.substr(-1) === '/' || path.startsWith('/~viewer')) {
      return new Response(HTML, {
        headers: {
          'Content-Type': 'text/html; charset=utf-8'
        }
      });
    } else {
      const result = await gd.getMetaByPath(path, rootId);

      if (!result) {
        return new Response('null', {
          headers: {
            'Content-Type': 'application/json'
          },
          status: 404
        });
      }

      const isGoogleApps = result.mimeType.includes('vnd.google-apps');

      if (!isGoogleApps) {
        const r = await gd.download(result.id, request.headers.get('Range'));
        const h = new Headers(r.headers);
        h.set('Content-Disposition', `inline; filename*=UTF-8''${encodeURIComponent(result.name)}`);
        return new Response(r.body, {
          status: r.status,
          headers: h
        });
      } else {
        return Response.redirect(result.webViewLink, 302);
      }
    }
  }

  async function onPost(request) {
    let {
      pathname: path
    } = request;
    const rootId = request.searchParams.get('rootId') || self.props.default_root_id;

    if (path.substr(-1) === '/') {
      return new Response(JSON.stringify((await gd.listFolderByPath(path, rootId))), {
        headers: {
          'Content-Type': 'application/json'
        }
      });
    } else {
      const result = await gd.getMetaByPath(path, rootId);

      if (!result) {
        return new Response('null', {
          headers: {
            'Content-Type': 'application/json'
          },
          status: 404
        });
      }

      const isGoogleApps = result.mimeType.includes('vnd.google-apps');

      if (!isGoogleApps) {
        const r = await gd.download(result.id, request.headers.get('Range'));
        const h = new Headers(r.headers);
        h.set('Content-Disposition', `inline; filename*=UTF-8''${encodeURIComponent(result.name)}`);
        return new Response(r.body, {
          status: r.status,
          headers: h
        });
      } else {
        return Response.redirect(result.webViewLink, 302);
      }
    }
  }

  async function onPut(request) {
    if (!self.props.upload) {
      return new Response("Upload isn't enabled.", {
        headers: {
          'Content-Type': 'text/plain'
        },
        status: 405
      });
    }

    let {
      pathname: path
    } = request;

    if (path.substr(-1) === '/') {
      return new Response(null, {
        headers: {
          'Content-Type': 'application/json'
        },
        status: 405
      });
    }

    const url = request.searchParams.get('url');
    let fileBody;

    if (url) {
      const u = new URL(url);
      const Referer = u.href;
      const Origin = u.protocol + '//' + u.host;
      fileBody = (await fetch(url, {
        headers: {
          Referer,
          Origin
        }
      })).body;
    } else {
      fileBody = request.body;
    }

    const tok = path.split('/');
    const name = tok.pop();
    const parent = tok.join('/');
    const rootId = request.searchParams.get('rootId') || self.props.default_root_id;
    return new Response(JSON.stringify((await gd.uploadByPath(parent, name, fileBody, rootId))), {
      headers: {
        'Content-Type': 'application/json'
      }
    });
  }

  function unauthorized() {
    return new Response('Unauthorized', {
      headers: {
        'WWW-Authenticate': 'Basic realm="goindex"',
        'Access-Control-Allow-Origin': '*'
      },
      status: 401
    });
  }

  function parseBasicAuth(auth) {
    try {
      return atob(auth.split(' ').pop()).split(':');
    } catch (e) {
      return [];
    }
  }

  function doBasicAuth(request) {
    const auth = request.headers.get('Authorization');

    if (!auth || !/^Basic [A-Za-z0-9._~+/-]+=*$/i.test(auth)) {
      return false;
    }

    const [user, pass] = parseBasicAuth(auth);
    return user === self.props.user && pass === self.props.pass;
  }

  function encodePathComponent(path) {
    return path.split('/').map(encodeURIComponent).join('/');
  }

  async function handleRequest(request) {
    if (request.method === 'OPTIONS') // allow preflight request
      return new Response('', {
        status: 200,
        headers: {
          'Access-Control-Allow-Origin': '*',
          'Access-Control-Allow-Headers': '*',
          'Access-Control-Allow-Methods': 'GET, POST, PUT, HEAD, OPTIONS'
        }
      });

    if (self.props.auth && !doBasicAuth(request)) {
      return unauthorized();
    }

    request = Object.assign({}, request, new URL(request.url));
    request.pathname = request.pathname.split('/').map(decodeURIComponent).map(decodeURIComponent) // for some super special cases, browser will force encode it...   eg: +αあるふぁきゅん。 - +♂.mp3
    .join('/');

    if (self.props.lite && request.pathname.endsWith('/')) {
      // lite mode
      const path = request.pathname;
      let parent = encodePathComponent(path.split('/').slice(0, -2).join('/') + '/');
      const {
        files
      } = await gd.listFolderByPath(path, self.props.default_root_id);
      let fileht = '';

      for (const f of files) {
        const isf = f.mimeType === 'application/vnd.google-apps.folder';
        const p = encodePathComponent(path + f.name);
        fileht += `<li><a href="${p + (isf ? '/' : '')}">${f.name}</a></li>`;
      }

      const ht = `<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<html>
<head>
<title>Index of ${path}</title>
</head>
<body>
<h1>Index of ${path}</h1>
<ul>
<li><a href="${parent}"> Parent Directory</a></li>
${fileht}
</ul>
</body>
</html>`;
      return new Response(ht, {
        status: 200,
        headers: {
          'Content-Type': 'text/html; charset=utf-8'
        }
      });
    }

    let resp;
    if (request.method === 'GET') resp = await onGet(request);else if (request.method === 'POST') resp = await onPost(request);else if (request.method === 'PUT') resp = await onPut(request);else resp = new Response('', {
      status: 405
    });
    const obj = Object.create(null);

    for (const [k, v] of resp.headers.entries()) {
      obj[k] = v;
    }

    return new Response(resp.body, {
      status: resp.status,
      statusText: resp.statusText,
      headers: Object.assign(obj, {
        'Access-Control-Allow-Origin': '*'
      })
    });
  }

  addEventListener('fetch', event => {
    event.respondWith(handleRequest(event.request).catch(err => {
      console.error(err);
      return new Response(JSON.stringify(err.stack), {
        status: 500,
        headers: {
          'Content-Type': 'application/json'
        }
      });
    }));
  });

}());