I decided to use upup.js by Tal Ater, website here:
https://www.talater.com/upup/getting-started-with-offline-first.html,
mainly because I had a project deadline and needed something with a short
learning curve.
The main thing about PWAs appears to be that the service worker javascript
files need to be accessible from the domain root.
Warning - this is all very hackish - I wasn't sure how to get a file to
appear as if it was on the actual domain root.
I tried setting it up using a controller to serve as the base for the JS
and manifest files in order to mimic the root.
This is the controller setup:
def manifest():
item = db(db.item.id > 0).select().first()
return locals()
def upup():
return locals()
def upup_sw():
return locals()
manifest.json
{
"name": "{{=item.name}}",
"short_name": "{{=item.slugname}}",
"theme_color": "#2196f3",
"background_color": "rgba(243,216,33,0.62)",
"display": "standalone",
"Scope": "/app2/items/",
"start_url": "/app2/items/",
"icons": [
{
"src": "{{=URL('static', 'images/icons/icon-72x72.png',
scheme='https', host=True)}}",
"sizes": "72x72",
"type": "image/png"
},
{
"src": "{{=URL('static', 'images/icons/icon-96x96.png',
scheme='https', host=True)}}",
"sizes": "96x96",
"type": "image/png"
},
{
"src": "{{=URL('static', 'images/icons/icon-128x128.png',
scheme='https', host=True)}}",
"sizes": "128x128",
"type": "image/png"
},
{
"src": "{{=URL('static', 'images/icons/icon-144x144.png',
scheme='https', host=True)}}",
"sizes": "144x144",
"type": "image/png"
},
{
"src": "{{=URL('static', 'images/icons/icon-152x152.png',
scheme='https', host=True)}}",
"sizes": "152x152",
"type": "image/png"
},
{
"src": "{{=URL('static', 'images/icons/icon-192x192.png',
scheme='https', host=True)}}",
"sizes": "192x192",
"type": "image/png"
},
{
"src": "{{=URL('static', 'images/icons/icon-384x384.png',
scheme='https', host=True)}}",
"sizes": "384x384",
"type": "image/png"
},
{
"src": "{{=URL('static', 'images/icons/icon-512x512.png',
scheme='https', host=True)}}",
"sizes": "512x512",
"type": "image/png"
}
],
"splash_pages": null
}
upup.js # I simply copied the contents
//! UpUp
//! version : 1.0.0
//! author : Tal Ater @TalAter
//! license : MIT
//! https://github.com/TalAter/UpUp
(function(e){"use strict";var t=navigator.serviceWorker;if(!t)return this.
UpUp=null,e;var n={"service-worker-url":"{{=URL('items', 'upup_sw.js',
scheme=True, )}}"},r=!1,s="font-weight: bold; color: #00f;";this.UpUp={start
:function(e){this.addSettings(e),t.register(n["service-worker-url"],{scope:
"./app2/items/"}).then(function(e){r&&console.log("Service worker
registration successful with scope: %c"+e.scope,s);(e.installing||t.
controller||e.active).postMessage({action:"set-settings",settings:n})}).
catch(function(e){r&&console.log("Service worker registration failed: %c"+e,
s)})},addSettings:function(t){"string"==typeof(t=t||{})&&(t={content:t}),[
"content","content-url","assets","service-worker-url","cache-version"].
forEach(function(r){t[r]!==e&&(n[r]=t[r])})},debug:function(e){r=!(arguments
.length>0)||!!e}}}).call(this);
//# sourceMappingURL=upup.js.map
upup_sw.js
//! UpUp Service Worker
//! version : 1.0.0
//! license : MIT
//! https://github.com/TalAter/UpUp
var _CACHE_NAME_PREFIX="upup-cache",_calculateHash=function(e){var t,n=0,s=(
e=e.toString()).length;if(0===s)return n;for(t=0;t<s;t++)n=(n<<5)-n+e.
charCodeAt(t),n|=0;return n};self.addEventListener("message",function(e){
"set-settings"===e.data.action&&_parseSettingsAndCache(e.data.settings)}),
self.addEventListener("fetch",function(e){e.respondWith(fetch(e.request).
catch(function(){return caches.match(e.request).then(function(t){return t||(
"navigate"===e.request.mode||"GET"===e.request.method&&e.request.headers.get
("accept").includes("text/html")?caches.match("sw-offline-content"):void 0
)})}))});var _parseSettingsAndCache=function(e){var t=_CACHE_NAME_PREFIX+"-"
+(e["cache-version"]?e["cache-version"]+"-":"")+_calculateHash(e.content+e[
"content-url"]+e.assets);return caches.open(t).then(function(t){return e.
assets&&t.addAll(e.assets.map(function(e){return new Request(e,{mode:
"no-cors"})})),e["content-url"]?fetch(e["content-url"],{mode:"no-cors"}).
then(function(e){return t.put("sw-offline-content",e)}):e.content?t.put(
"sw-offline-content",_buildResponse(e.content)):t.put("sw-offline-content",
_buildResponse("You are offline"))}).then(function(){return caches.keys().
then(function(e){return Promise.all(e.map(function(e){if(e.startsWith(
_CACHE_NAME_PREFIX)&&t!==e)return caches.delete(e)}))})})},_buildResponse=
function(e){return new Response(e,{headers:{"Content-Type":"text/html"}})};
//# sourceMappingURL=upup_sw.js.map
The main issue I'm having so far is getting a 404 error when trying to load
the service worker file (upup_sw.js) which I think is a path issue (inside
upup.js).
Any ideas?
--
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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