Class: SWHelper

Inherits:
Object
  • Object
show all
Defined in:
lib/jekyll-pwa-plugin.rb

Constant Summary collapse

WORKBOX_VERSION =
'v5.1.4'

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(site, config) ⇒ SWHelper

Returns a new instance of SWHelper.


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# File 'lib/jekyll-pwa-plugin.rb', line 3

def initialize(site, config)
    @site = site
    @config = config
    @sw_filename = @config['sw_dest_filename'] || 'service-worker.js'
    @sw_src_filepath = @config['sw_src_filepath'] || 'service-worker.js'
end

Class Method Details

.insert_sw_register_into_body(page) ⇒ Object


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# File 'lib/jekyll-pwa-plugin.rb', line 131

def self.insert_sw_register_into_body(page)
    page.output = page.output.sub('</body>',
    <<-SCRIPT
        <script>
            window.onload = function () {
                var script = document.createElement('script');
                var firstScript = document.getElementsByTagName('script')[0];
                script.type = 'text/javascript';
                script.async = true;
                script.src = '#{page.site.baseurl.to_s}/sw-register.js?v=' + Date.now();
                firstScript.parentNode.insertBefore(script, firstScript);
            };
        </script>
        </body>
    SCRIPT
    )
end

Instance Method Details

#generate_workbox_precacheObject


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# File 'lib/jekyll-pwa-plugin.rb', line 40

def generate_workbox_precache()
    directory = @config['precache_glob_directory'] || '/'
    directory = @site.in_dest_dir(directory)
    patterns = @config['precache_glob_patterns'] || ['**/*.{html,js,css,eot,svg,ttf,woff}']
    ignores = @config['precache_glob_ignores'] || []
    recent_posts_num = @config['precache_recent_posts_num']

    # according to workbox precache {url: 'main.js', revision: 'xxxx'}
    @precache_list = []

    # find precache files with glob
    precache_files = []
    patterns.each do |pattern|
        Dir.glob(File.join(directory, pattern)) do |filepath|
            precache_files.push(filepath)
        end
    end
    precache_files = precache_files.uniq

    # precache recent n posts
    posts_path_url_map = {}
    if recent_posts_num
        precache_files.concat(
            @site.posts.docs
                .reverse.take(recent_posts_num)
                .map do |post|
                    posts_path_url_map[post.path] = post.url
                    post.path
                end
        )
    end

    # filter with ignores
    ignores.each do |pattern|
        Dir.glob(File.join(directory, pattern)) do |ignored_filepath|
            precache_files.delete(ignored_filepath)
        end
    end

    # generate md5 for each precache file
    md5 = Digest::MD5.new
    precache_files.each do |filepath|
        md5.reset
        md5 << File.read(filepath)
        if posts_path_url_map[filepath]
            url = posts_path_url_map[filepath]
        else
            url = filepath.sub(@site.dest, '')
        end
        @precache_list.push({
            url: @site.baseurl.to_s + url,
            revision: md5.hexdigest
        })
    end
end

#write_swObject


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# File 'lib/jekyll-pwa-plugin.rb', line 96

def write_sw()

    dest_js_directory = @config['dest_js_directory'] || 'js'

    # copy polyfill & workbox.js to js/
    script_directory = @site.in_dest_dir(dest_js_directory)
    FileUtils.mkdir_p(script_directory) unless Dir.exist?(script_directory)
    FileUtils.cp_r(File.expand_path('../vendor/', __FILE__) + '/.', script_directory)

    # generate precache list
    precache_list_str = @precache_list.map do |precache_item|
        precache_item.to_json
    end
    .join(",")

    # write service-worker.js
    sw_src_file_str = File.read(@site.in_source_dir(@sw_src_filepath))
    workbox_dir = File.join(@site.baseurl.to_s, dest_js_directory, "workbox-#{SWHelper::WORKBOX_VERSION}")
    import_scripts_str = 
    <<-SCRIPT
        importScripts("#{workbox_dir}/workbox-sw.js");
        workbox.setConfig({modulePathPrefix: "#{workbox_dir}"});
    SCRIPT

    sw_dest_file = File.new(@site.in_dest_dir(@sw_filename), 'w')
    sw_dest_file.puts(
    <<-SCRIPT
        #{import_scripts_str}
        self.__precacheManifest = [#{precache_list_str}];
        #{sw_src_file_str}
    SCRIPT
    )
    sw_dest_file.close
end

#write_sw_registerObject


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# File 'lib/jekyll-pwa-plugin.rb', line 10

def write_sw_register()
    sw_register_filename = 'sw-register.js'
    sw_register_file = File.new(@site.in_dest_dir(sw_register_filename), 'w')
    # add build version in url params
    sw_register_file.puts(
    <<-SCRIPT
    if ('serviceWorker' in navigator) {
        navigator.serviceWorker.register('#{@site.baseurl.to_s}/#{@sw_filename}?v=#{@site.time.to_i.to_s}').then(function(reg) {
            reg.onupdatefound = function() {
                var installingWorker = reg.installing;
                installingWorker.onstatechange = function() {
                    switch (installingWorker.state) {
                        case 'installed':
                            if (navigator.serviceWorker.controller) {
                                var event = new Event('sw.update');
                                window.dispatchEvent(event);
                            }
                            break;
                    }
                };
            };
        }).catch(function(e) {
            console.error('Error during service worker registration:', e);
        });
    }
    SCRIPT
    )
    sw_register_file.close
end