Class: WorkboxHelper

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

Constant Summary collapse

WORKBOX_VERSION = 
'3.6.3'

Instance Method Summary collapse

Constructor Details

#initialize(site, config) ⇒ WorkboxHelper

Returns a new instance of WorkboxHelper.



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# File 'lib/jekyll-workbox-plugin.rb', line 4

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

Instance Method Details

#generate_workbox_precache ⇒ Object 



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# File 'lib/jekyll-workbox-plugin.rb', line 11

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|
        name_to_aliases = {}

        # this means there's no alias defined - just use file as only alias
        if pattern.is_a?(String)
            name_to_aliases = { pattern => pattern }
        elsif pattern.is_a?(Hash)
            name_to_aliases = pattern
        end

        # at this point, name_to_aliases is file -> alias or 
        # file -> [alias1, alias2], etc. there will never be more
        # than one key per yaml conventions
        filename, aliases = name_to_aliases.first

        # glob the filename, and push all aliases as just values
        Dir.glob(File.join(directory, filename)) do |filepath|
            if aliases.is_a?(String)
                file_alias = File.join(directory, aliases)
                precache_files.push({ filepath => file_alias })
            elsif aliases.is_a?(Array)
                aliases.each do |filepath_alias|
                    file_alias = File.join(directory, filepath_alias)
                    precache_files.push({ filepath => file_alias })
                end
            end
        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 => post.path }
                end
        )
    end

    # filter with ignores
    ignores.each do |pattern|
        Dir.glob(File.join(directory, pattern)) do |ignored_filepath|
            precache_files = precache_files.select { |file_map|
                file_map.first.first != ignored_filepath
            }.map{ |file_map| file_map }
        end
    end

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

#write_sw ⇒ Object 



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# File 'lib/jekyll-workbox-plugin.rb', line 93

def write_sw()
    # read the sw.js source file
    sw_js_str = File.read(@site.in_source_dir(@sw_src_filepath))

    # prepend the import scripts
    sw_js_str = "importScripts('https://storage.googleapis.com/workbox-cdn/releases/#{WorkboxHelper::WORKBOX_VERSION}/workbox-sw.js');\n#{sw_js_str}"

    # generate precache list and inject it into the sw.js
    precache_list_str = @precache_list.map do |precache_item|
        precache_item.to_json
    end.join(",")
    sw_js_str = sw_js_str.sub(
        "workbox.precaching.precacheAndRoute([])",
        "workbox.precaching.precacheAndRoute([#{precache_list_str}])")

    # write sw.js
    sw_dest_file = File.new(@site.in_dest_dir(@sw_filename), 'w')
    sw_dest_file.puts(sw_js_str)
    sw_dest_file.close
end