# all files / lighthouse-core/driver/gatherers/ manifest.js

100% Statements 30/30
100% Branches 10/10
100% Functions 5/5
100% Lines 30/30
14 statements, 3 functions, 6 branches Ignored

    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    12
    13
    14
    15
    16
    17
    18
    19
    20
    21
    22
    23
    24
    25
    26
    27
    28
    29
    30
    31
    32
    33
    34
    35
    36
    37
    38
    39
    40
    41
    42
    43
    44
    45
    46
    47
    48
    49
    50
    51
    52
    53
    54
    55
    56
    57
    58
    59
    60
    61
    62
    63
    64
    65
    66
    67
    68
    69
    70
    71
    72
    73
    74
    75
    76
    77
    78
    79
    80
    81
    82
    83
    84
    85
    86
    87
    88
    89
    90
    91
    92
    93
    94

    1×
    1×

    1×
    1×

    1×

    1×
    1×
    1×

    1×
    1×
    1×

    1×
    1×
    1×
    1×
    1×

    1×

    1×

    3×

    4×

    4×

    3×
    1×
    1×

    2×
    1×

    1×

    1×
    1×

    1×
     /**
     * @license
     * Copyright 2016 Google Inc. All rights reserved.
     *
     * Licensed under the Apache License, Version 2.0 (the "License");
     * you may not use this file except in compliance with the License.
     * You may obtain a copy of the License at
     *
     *     http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing, software
     * distributed under the License is distributed on an "AS IS" BASIS,
     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     * See the License for the specific language governing permissions and
     * limitations under the License.
     */
    'use strict';

    const Gather = require('./gather');
    const manifestParser = require('../../lib/manifest-parser');

    /* global document, XMLHttpRequest, __returnResults */

    /* istanbul ignore next */
    function getManifestContent() {
      function post(response) {
        // __returnResults is magically inserted by driver.evaluateAsync
        __returnResults(response);
      }

      const manifestNode = document.querySelector('link[rel=manifest]');
      if (!manifestNode) {
        return post({error: 'No <link rel="manifest"> found in DOM.'});
      }

      const manifestURL = manifestNode.href;
      if (!manifestURL) {
        return post({error: 'No href found on <link rel="manifest">.'});
      }

      const req = new XMLHttpRequest();
      req.open('GET', manifestURL);
      req.onload = function() {
        if (req.status !== 200) {
          return post({
            error: `Unable to fetch manifest at \
              ${manifestURL}: ${req.status} - ${req.statusText}`
          });
        }

        post({manifestContent: req.response});
      };
      req.send();
    }

    class Manifest extends Gather {

      static _errorManifest(errorString) {
        return {
          raw: undefined,
          value: undefined,
          debugString: errorString
        };
      }

      afterPass(options) {
        const driver = options.driver;
        /**
         * This re-fetches the manifest separately, which could
         * potentially lead to a different asset. Using the original manifest
         * resource is tracked in issue #83
         */
        return driver.evaluateAsync(`(${getManifestContent.toString()}())`)

        .then(returnedValue => {
          if (!returnedValue) {
            this.artifact = Manifest._errorManifest('Unable to retrieve manifest');
            return;
          }

          if (returnedValue.error) {
            this.artifact = Manifest._errorManifest(returnedValue.error);
          } else {
            this.artifact = manifestParser(returnedValue.manifestContent);
          }
        }, _ => {
          this.artifact = Manifest._errorManifest('Unable to retrieve manifest');
          return;
        });
      }
    }

    module.exports = Manifest;