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service-worker.js
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service-worker.js
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/**
* 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.
*/
// DO NOT EDIT THIS GENERATED OUTPUT DIRECTLY!
// This file should be overwritten as part of your build process.
// If you need to extend the behavior of the generated service worker, the best approach is to write
// additional code and include it using the importScripts option:
// https://github.com/GoogleChrome/sw-precache#importscripts-arraystring
//
// Alternatively, it's possible to make changes to the underlying template file and then use that as the
// new base for generating output, via the templateFilePath option:
// https://github.com/GoogleChrome/sw-precache#templatefilepath-string
//
// If you go that route, make sure that whenever you update your sw-precache dependency, you reconcile any
// changes made to this original template file with your modified copy.
// This generated service worker JavaScript will precache your site's resources.
// The code needs to be saved in a .js file at the top-level of your site, and registered
// from your pages in order to be used. See
// https://github.com/googlechrome/sw-precache/blob/master/demo/app/js/service-worker-registration.js
// for an example of how you can register this script and handle various service worker events.
/* eslint-env worker, serviceworker */
/* eslint-disable indent, no-unused-vars, no-multiple-empty-lines, max-nested-callbacks, space-before-function-paren, quotes, comma-spacing */
"use strict";
var precacheConfig = [
["contract.png", "57f44c7e84e8db553271cc408bbaad22"],
["index.html", "09cfa67d0f55dd2591b9f9ed72f747a0"],
["manifest.json", "350a5c214307ff3d11eee259369449b7"],
["myscripts.js", "298e946e4029dce801f90d9c6ce3cc44"],
["package.json", "c3e2229df6083112cb941dd02a8eb9e2"],
["style.css", "265a2c3891fe945c12ce436f7fb85b5e"],
];
var cacheName =
"sw-precache-v3-sw-precache-" +
(self.registration ? self.registration.scope : "");
var ignoreUrlParametersMatching = [/^utm_/];
var addDirectoryIndex = function (originalUrl, index) {
var url = new URL(originalUrl);
if (url.pathname.slice(-1) === "/") {
url.pathname += index;
}
return url.toString();
};
var cleanResponse = function (originalResponse) {
// If this is not a redirected response, then we don't have to do anything.
if (!originalResponse.redirected) {
return Promise.resolve(originalResponse);
}
// Firefox 50 and below doesn't support the Response.body stream, so we may
// need to read the entire body to memory as a Blob.
var bodyPromise =
"body" in originalResponse
? Promise.resolve(originalResponse.body)
: originalResponse.blob();
return bodyPromise.then(function (body) {
// new Response() is happy when passed either a stream or a Blob.
return new Response(body, {
headers: originalResponse.headers,
status: originalResponse.status,
statusText: originalResponse.statusText,
});
});
};
var createCacheKey = function (
originalUrl,
paramName,
paramValue,
dontCacheBustUrlsMatching
) {
// Create a new URL object to avoid modifying originalUrl.
var url = new URL(originalUrl);
// If dontCacheBustUrlsMatching is not set, or if we don't have a match,
// then add in the extra cache-busting URL parameter.
if (
!dontCacheBustUrlsMatching ||
!url.pathname.match(dontCacheBustUrlsMatching)
) {
url.search +=
(url.search ? "&" : "") +
encodeURIComponent(paramName) +
"=" +
encodeURIComponent(paramValue);
}
return url.toString();
};
var isPathWhitelisted = function (whitelist, absoluteUrlString) {
// If the whitelist is empty, then consider all URLs to be whitelisted.
if (whitelist.length === 0) {
return true;
}
// Otherwise compare each path regex to the path of the URL passed in.
var path = new URL(absoluteUrlString).pathname;
return whitelist.some(function (whitelistedPathRegex) {
return path.match(whitelistedPathRegex);
});
};
var stripIgnoredUrlParameters = function (
originalUrl,
ignoreUrlParametersMatching
) {
var url = new URL(originalUrl);
// Remove the hash; see https://github.com/GoogleChrome/sw-precache/issues/290
url.hash = "";
url.search = url.search
.slice(1) // Exclude initial '?'
.split("&") // Split into an array of 'key=value' strings
.map(function (kv) {
return kv.split("="); // Split each 'key=value' string into a [key, value] array
})
.filter(function (kv) {
return ignoreUrlParametersMatching.every(function (ignoredRegex) {
return !ignoredRegex.test(kv[0]); // Return true iff the key doesn't match any of the regexes.
});
})
.map(function (kv) {
return kv.join("="); // Join each [key, value] array into a 'key=value' string
})
.join("&"); // Join the array of 'key=value' strings into a string with '&' in between each
return url.toString();
};
var hashParamName = "_sw-precache";
var urlsToCacheKeys = new Map(
precacheConfig.map(function (item) {
var relativeUrl = item[0];
var hash = item[1];
var absoluteUrl = new URL(relativeUrl, self.location);
var cacheKey = createCacheKey(absoluteUrl, hashParamName, hash, false);
return [absoluteUrl.toString(), cacheKey];
})
);
function setOfCachedUrls(cache) {
return cache
.keys()
.then(function (requests) {
return requests.map(function (request) {
return request.url;
});
})
.then(function (urls) {
return new Set(urls);
});
}
self.addEventListener("install", function (event) {
event.waitUntil(
caches
.open(cacheName)
.then(function (cache) {
return setOfCachedUrls(cache).then(function (cachedUrls) {
return Promise.all(
Array.from(urlsToCacheKeys.values()).map(function (cacheKey) {
// If we don't have a key matching url in the cache already, add it.
if (!cachedUrls.has(cacheKey)) {
var request = new Request(cacheKey, {
credentials: "same-origin",
});
return fetch(request).then(function (response) {
// Bail out of installation unless we get back a 200 OK for
// every request.
if (!response.ok) {
throw new Error(
"Request for " +
cacheKey +
" returned a " +
"response with status " +
response.status
);
}
return cleanResponse(response).then(function (
responseToCache
) {
return cache.put(cacheKey, responseToCache);
});
});
}
})
);
});
})
.then(function () {
// Force the SW to transition from installing -> active state
return self.skipWaiting();
})
);
});
self.addEventListener("activate", function (event) {
var setOfExpectedUrls = new Set(urlsToCacheKeys.values());
event.waitUntil(
caches
.open(cacheName)
.then(function (cache) {
return cache.keys().then(function (existingRequests) {
return Promise.all(
existingRequests.map(function (existingRequest) {
if (!setOfExpectedUrls.has(existingRequest.url)) {
return cache.delete(existingRequest);
}
})
);
});
})
.then(function () {
return self.clients.claim();
})
);
});
self.addEventListener("fetch", function (event) {
if (event.request.method === "GET") {
// Should we call event.respondWith() inside this fetch event handler?
// This needs to be determined synchronously, which will give other fetch
// handlers a chance to handle the request if need be.
var shouldRespond;
// First, remove all the ignored parameters and hash fragment, and see if we
// have that URL in our cache. If so, great! shouldRespond will be true.
var url = stripIgnoredUrlParameters(
event.request.url,
ignoreUrlParametersMatching
);
shouldRespond = urlsToCacheKeys.has(url);
// If shouldRespond is false, check again, this time with 'index.html'
// (or whatever the directoryIndex option is set to) at the end.
var directoryIndex = "index.html";
if (!shouldRespond && directoryIndex) {
url = addDirectoryIndex(url, directoryIndex);
shouldRespond = urlsToCacheKeys.has(url);
}
// If shouldRespond is still false, check to see if this is a navigation
// request, and if so, whether the URL matches navigateFallbackWhitelist.
var navigateFallback = "";
if (
!shouldRespond &&
navigateFallback &&
event.request.mode === "navigate" &&
isPathWhitelisted([], event.request.url)
) {
url = new URL(navigateFallback, self.location).toString();
shouldRespond = urlsToCacheKeys.has(url);
}
// If shouldRespond was set to true at any point, then call
// event.respondWith(), using the appropriate cache key.
if (shouldRespond) {
event.respondWith(
caches
.open(cacheName)
.then(function (cache) {
return cache
.match(urlsToCacheKeys.get(url))
.then(function (response) {
if (response) {
return response;
}
throw Error(
"The cached response that was expected is missing."
);
});
})
.catch(function (e) {
// Fall back to just fetch()ing the request if some unexpected error
// prevented the cached response from being valid.
console.warn(
'Couldn\'t serve response for "%s" from cache: %O',
event.request.url,
e
);
return fetch(event.request);
})
);
}
}
});