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cribjs
Commit e161dacb authored by Cédric Le Ninivin's avatar Cédric Le Ninivin
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cribjs initial working version Welcome to Free Web \o/

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app.js 0 → 100644
View file @ e161dacb
if ('serviceWorker' in navigator) {
navigator.serviceWorker.register('./sw.js', {scope: './'}).then(function() {
// Registration was successful. Now, check to see whether the Service Worker is controlling the page.
if (navigator.serviceWorker.controller) {
// If .controller is set, then this page is being actively controlled by the Service Worker.
// Show the interface for sending messages to the service worker.
showCommands();
} else {
// If .controller isn't set, then prompt the user to reload the page so that the Service Worker can take
// control. Until that happens, the Service Worker's message handler won't be used.
document.querySelector('#status').textContent =
'Please reload this page to allow the service worker to take control.';
}
}).catch(function(error) {
// Something went wrong during registration. The service-worker.js file
// might be unavailable or contain a syntax error.
document.querySelector('#status').textContent = error;
});
} else {
// The current browser doesn't support Service Workers.
var aElement = document.createElement('a');
aElement.href = 'http://www.chromium.org/blink/serviceworker/service-worker-faq';
aElement.textContent = 'Service Workers are not supported in the current browser.';
document.querySelector('#status').appendChild(aElement);
}
function setStatus(statusMessage) {
document.querySelector('#status').textContent = statusMessage;
}
function showCommands() {
document.querySelector('#add').addEventListener('click', function() {
var url = document.querySelector('#url').value;
sendMessage({
command: 'add',
url: url,
information: new Blob([document.querySelector('#information').value], {
type: document.querySelector('#mimetype').value
})
}).then(function() {
// If the promise resolves, just display a success message.
setStatus('Added to cache: ' + url + ' at ' +Date());
}).catch(setStatus); // If the promise rejects, then setStatus will be called with the error.
});
document.querySelector('#delete').addEventListener('click', function() {
sendMessage({
command: 'delete',
url: document.querySelector('#url').value
}).then(function() {
// If the promise resolves, just display a success message.
setStatus('Deleted from cache.');
}).catch(setStatus); // If the promise rejects, then setStatus will be called with the error.
});
document.querySelector('#list-contents').addEventListener('click', function() {
sendMessage({
command: 'keys'
}).then(function(data) {
var contentsElement = document.querySelector('#contents');
// Clear out the existing items from the list.
while (contentsElement.firstChild) {
contentsElement.removeChild(contentsElement.firstChild);
}
// Add each cached URL to the list, one by one.
data.urls.forEach(function(url) {
var liElement = document.createElement('li');
liElement.textContent = url;
contentsElement.appendChild(liElement);
});
}).catch(setStatus); // If the promise rejects, then setStatus will be called with the error.
});
document.querySelector('#get').addEventListener('click', function() {
getContent(document.querySelector('#url').value,
function() {
document.querySelector('#mimetype').value = this.getResponseHeader("content-type");
document.querySelector('#information').value = this.responseText;
}
);
})
document.querySelector('#save-contents').addEventListener('click', function() {
sendMessage({
command: 'keys'
}).then(function(data) {
// Add each cached URL to the list, one by one.
data.urls.forEach(function(url) {
getContent(url,
function(){
var url_content = {'content_type': '', 'content':''};
url_content.content_type = this.getResponseHeader("content-type");
url_content.content = this.responseText;
localStorage.setItem(url, url_content);
}
);
});
}).catch(setStatus); // If the promise rejects, then setStatus will be called with the error.
});
document.querySelector('#commands').style.display = 'block';
}
function sendMessage(message) {
// This wraps the message posting/response in a promise, which will resolve if the response doesn't
// contain an error, and reject with the error if it does. If you'd prefer, it's possible to call
// controller.postMessage() and set up the onmessage handler independently of a promise, but this is
// a convenient wrapper.
return new Promise(function(resolve, reject) {
var messageChannel = new MessageChannel();
messageChannel.port1.onmessage = function(event) {
if (event.data.error) {
reject(event.data.error);
} else {
resolve(event.data);
}
};
// This sends the message data as well as transferring messageChannel.port2 to the service worker.
// The service worker can then use the transferred port to reply via postMessage(), which
// will in turn trigger the onmessage handler on messageChannel.port1.
// See https://html.spec.whatwg.org/multipage/workers.html#dom-worker-postmessage
navigator.serviceWorker.controller.postMessage(message, [messageChannel.port2]);
});
}
function getContent(url, reqListener) {
var oReq = new XMLHttpRequest();
oReq.onload = reqListener;
oReq.open("get", url, true);
oReq.send();
}
\ No newline at end of file
index.html 0 → 100644
View file @ e161dacb
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="viewport" content="width=device-width">
<title>Service worker demo</title>
<!--[if lt IE 9]>
<script src="//html5shiv.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
</head>
<body>
<h1>Free Web Initiative with CribJS: Start your Website</h1>
<p>You can start building this website by editing the content of the input here:</p>
<ul>
<li>First field: the path</li>
<li>First field: mimetype</li>
<li>First field: the content</li>
</ul>
<p>Have fun building the web :)</p>
<div class="output">
<div id="status"></div>
<div id="commands" style="display: none">
<div>
<label for="url">Resource URL:</label>
<input id="url" type="text" size="50" value="test.html">
<button id="get">Get from Cache</button>
<input id="mimetype" type="text" size="50" value="text/html">
<div>
<textarea id="information" cols="35" wrap="soft"></textarea>
</div>
<div>
<button id="add">Add to Cache</button>
<button id="delete">Delete from Cache</button>
</div>
<div>
<button id="list-contents">List Cache Contents</button>
<button id="save-contents">Save Cache</button>
<button id="load-contents">Load Cache</button>
</div>
<ul id="contents"></ul>
</div>
</div>
<script src="app.js"></script>
</body>
</html>
\ No newline at end of file
serviceworker-cache-polyfill.js 0 → 100644
View file @ e161dacb
// Via https://github.com/coonsta/cache-polyfill/blob/master/dist/serviceworker-cache-polyfill.js
// Adds in some functionality missing in Chrome 40.
if (!Cache.prototype.add) {
Cache.prototype.add = function add(request) {
return this.addAll([request]);
};
}
if (!Cache.prototype.addAll) {
Cache.prototype.addAll = function addAll(requests) {
var cache = this;
// Since DOMExceptions are not constructable:
function NetworkError(message) {
this.name = 'NetworkError';
this.code = 19;
this.message = message;
}
NetworkError.prototype = Object.create(Error.prototype);
return Promise.resolve().then(function() {
if (arguments.length < 1) throw new TypeError();
// Simulate sequence<(Request or USVString)> binding:
var sequence = [];
requests = requests.map(function(request) {
if (request instanceof Request) {
return request;
}
else {
return String(request); // may throw TypeError
}
});
return Promise.all(
requests.map(function(request) {
if (typeof request === 'string') {
request = new Request(request);
}
var scheme = new URL(request.url).protocol;
if (scheme !== 'http:' && scheme !== 'https:') {
throw new NetworkError("Invalid scheme");
}
return fetch(request.clone());
})
);
}).then(function(responses) {
// TODO: check that requests don't overwrite one another
// (don't think this is possible to polyfill due to opaque responses)
return Promise.all(
responses.map(function(response, i) {
return cache.put(requests[i], response);
})
);
}).then(function() {
return undefined;
});
};
}
if (!CacheStorage.prototype.match) {
// This is probably vulnerable to race conditions (removing caches etc)
CacheStorage.prototype.match = function match(request, opts) {
var caches = this;
return this.keys().then(function(cacheNames) {
var match;
return cacheNames.reduce(function(chain, cacheName) {
return chain.then(function() {
return match || caches.open(cacheName).then(function(cache) {
return cache.match(request, opts);
}).then(function(response) {
match = response;
return match;
});
});
}, Promise.resolve());
});
};
}
sw.js 0 → 100644
View file @ e161dacb
/*
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.
*/
// This polyfill provides Cache.add(), Cache.addAll(), and CacheStorage.match(),
// which are not implemented in Chrome 40.
importScripts('./serviceworker-cache-polyfill.js');
// While overkill for this specific sample in which there is only one cache,
// this is one best practice that can be followed in general to keep track of
// multiple caches used by a given service worker, and keep them all versioned.
// It maps a shorthand identifier for a cache to a specific, versioned cache name.
// Note that since global state is discarded in between service worker restarts, these
// variables will be reinitialized each time the service worker handles an event, and you
// should not attempt to change their values inside an event handler. (Treat them as constants.)
// If at any point you want to force pages that use this service worker to start using a fresh
// cache, then increment the CACHE_VERSION value. It will kick off the service worker update
// flow and the old cache(s) will be purged as part of the activate event handler when the
// updated service worker is activated.
var CACHE_VERSION = 1;
var CURRENT_CACHES = {
'cribjs': 'post-message-cache-v' + CACHE_VERSION
};
self.addEventListener('activate', function(event) {
// Delete all caches that aren't named in CURRENT_CACHES.
// While there is only one cache in this example, the same logic will handle the case where
// there are multiple versioned caches.
var expectedCacheNames = Object.keys(CURRENT_CACHES).map(function(key) {
return CURRENT_CACHES[key];
});
event.waitUntil(
caches.keys().then(function(cacheNames) {
return Promise.all(
cacheNames.map(function(cacheName) {
if (expectedCacheNames.indexOf(cacheName) == -1) {
// If this cache name isn't present in the array of "expected" cache names, then delete it.
console.log('Deleting out of date cache:', cacheName);
return caches.delete(cacheName);
}
})
);
})
);
});
self.addEventListener('fetch', function(event) {
console.log('Handling fetch event for', event.request.url);
if (event.request.method === "GET") {
event.respondWith(
caches.open(CURRENT_CACHES['cribjs']).then(function(cache) {
return cache.match(event.request).then(function(response) {
if (response) {
// If there is an entry in the cache for event.request, then response will be defined
// and we can just return it. Note that in this example, only font resources are cached.
console.log(' Found response in cache:', response);
return response;
} else {
// Otherwise, if there is no entry in the cache for event.request, response will be
// undefined, and we need to fetch() the resource.
console.log(' No response for %s found in cache. About to fetch from network...', event.request.url);
// We call .clone() on the request since we might use it in a call to cache.put() later on.
// Both fetch() and cache.put() "consume" the request, so we need to make a copy.
// (see https://fetch.spec.whatwg.org/#dom-request-clone)
return fetch(event.request.clone()).then(function(response) {
console.log(' Response for %s from network is: %O', event.request.url, response);
// Return the original response object, which will be used to fulfill the resource request.
//cache.put(event.request, response.clone());
return response;
});
}
}).catch(function(error) {
// This catch() will handle exceptions that arise from the match() or fetch() operations.
// Note that a HTTP error response (e.g. 404) will NOT trigger an exception.
// It will return a normal response object that has the appropriate error code set.
console.error(' Error in fetch handler:', error);
throw error;
});
})
);
} else {
event.respondWith(fetch(event.request));
}
});
self.addEventListener('message', function(event) {
console.log('Handling message event:', event);
caches.open(CURRENT_CACHES['cribjs']).then(function(cache) {
switch (event.data.command) {
// This command returns a list of the URLs corresponding to the Request objects
// that serve as keys for the current cache.
case 'keys':
cache.keys().then(function(requests) {
var urls = requests.map(function(request) {
return request.url;
});
// event.ports[0] corresponds to the MessagePort that was transferred as part of the controlled page's
// call to controller.postMessage(). Therefore, event.ports[0].postMessage() will trigger the onmessage
// handler from the controlled page.
// It's up to you how to structure the messages that you send back; this is just one example.
event.ports[0].postMessage({
error: null,
urls: urls.sort()
});
});
break;
// This command adds a new request/response pair to the cache.
case 'add':
// If event.data.url isn't a valid URL, new Request() will throw a TypeError which will be handled
// by the outer .catch().
// Hardcode {mode: 'no-cors} since the default for new Requests constructed from strings is to require
// CORS, and we don't have any way of knowing whether an arbitrary URL that a user entered supports CORS.
var request = new Request(event.data.url, {mode: 'no-cors'}),
response = new Response(event.data.information);
cache.put(request, response).then(function() {
event.ports[0].postMessage({
error: null
});
});
break;
// This command removes a request/response pair from the cache (assuming it exists).
case 'delete':
var request = new Request(event.data.url, {mode: 'no-cors'});
cache.delete(request).then(function(success) {
event.ports[0].postMessage({
error: success ? null : 'Item was not found in the cache.'
});
});
break;
default:
// This will be handled by the outer .catch().
throw 'Unknown command: ' + event.data.command;
}
}).catch(function(error) {
// If the promise rejects, handle it by returning a standardized error message to the controlled page.
console.error('Message handling failed:', error);
event.ports[0].postMessage({
error: error.toString()
});
});
});
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