Add cache function to gyazo plugin

plugin/gyazo.rb

@@ -5,19 +5,58 @@
 #
 require 'net/http'
 require 'json'
+require 'fileutils'
 
 if /^(form|edit|formplugin|showcomment)$/ =~ @mode then
 	enable_js('gyazo.js')
 end
 
-def gyazo(permalink_url, alt = '[description]', style = 'photo')
-	size = @conf['gyazo_max_size'] || 512
+def gyazo_extract_id(permalink_url)
+	# Extract Gyazo ID from permalink URL
+	# e.g., "https://gyazo.com/71a4efdd066f5c2ebd11ee5a37b8f9ef" -> "71a4efdd066f5c2ebd11ee5a37b8f9ef"
+	permalink_url.to_s.strip.match(%r{gyazo\.com/([a-f0-9]+)}i)&.captures&.first
+end
+
+def gyazo_oembed_fetch(permalink_url)
+	gyazo_id = gyazo_extract_id(permalink_url)
+	return nil unless gyazo_id
+
+	cache_dir = File.join(@cache_path, 'gyazo')
+	cache_file = File.join(cache_dir, "#{gyazo_id}.json")
+
+	# Load from cache if available (skip cache in preview mode)
+	if @mode != 'preview' && File.exist?(cache_file)
+		begin
+			json_data = File.read(cache_file)
+			return JSON.parse(json_data, symbolize_names: true)
+		rescue => e
+			@logger.warn("gyazo.rb: cache read error for #{gyazo_id}: #{e.message}")
+			# Continue to fetch from API if cache read fails
+		end
+	end
+
+	# Fetch from Gyazo OEmbed API
 	begin
-		oembed = JSON.parse(Net::HTTP.get(URI("https://api.gyazo.com/api/oembed?url=#{permalink_url}")), symbolize_names: true)
+		json_data = Net::HTTP.get(URI("https://api.gyazo.com/api/oembed?url=#{permalink_url}"))
+		oembed = JSON.parse(json_data, symbolize_names: true)
+
+		# Save to cache
+		FileUtils.mkdir_p(cache_dir) unless File.directory?(cache_dir)
+		File.write(cache_file, json_data)
+
+		oembed
 	rescue => e
-		@logger.error(e)
-		return ''
+		@logger.error("gyazo.rb: API error for #{permalink_url}: #{e.message}")
+		nil
 	end
+end
+
+def gyazo(permalink_url, alt = '[description]', style = 'photo')
+	size = @conf['gyazo_max_size'] || 512
+
+	oembed = gyazo_oembed_fetch(permalink_url)
+	return '' unless oembed
+
 	url = oembed[:url].gsub(%r|/thumb/\d+/|, "/thumb/#{size}/")
 	width = oembed[:width].to_i
 	height = oembed[:height].to_i
@@ -69,11 +108,29 @@ def gyazo_list
 	'</div></div>'
 end
 
+def gyazo_clear_cache
+	cache_dir = File.join(@cache_path, 'gyazo')
+	return unless File.directory?(cache_dir)
+
+	count = 0
+	Dir.glob(File.join(cache_dir, '*.json')).each do |cache_file|
+		File.delete(cache_file)
+		count += 1
+	end
+	@logger.info("gyazo.rb: cleared #{count} cache files")
+	count
+end
+
 add_conf_proc('gyazo', 'Gyazo') do
 	if @mode == 'saveconf'
 		@conf['gyazo_token'] = @cgi.params['gyazo_token'][0]
 		@conf['gyazo_max_images'] = @cgi.params['gyazo_max_images'][0].to_i
 		@conf['gyazo_max_size'] = @cgi.params['gyazo_max_size'][0].to_i
+
+		if @cgi.params['gyazo_clear_cache'][0] == 'true'
+			count = gyazo_clear_cache
+			@conf.save
+		end
 	end
 	@conf['gyazo_max_images'] = 5 if @conf['gyazo_max_images'].to_i < 1
 	@conf['gyazo_max_size'] = 512 if @conf['gyazo_max_size'].to_i < 1
@@ -83,8 +140,12 @@ def gyazo_list
 	r << %Q|<p>Get your token from <a href="https://gyazo.com/oauth/applications">Gyazo Applications</a></p>|
 	r << %Q|<p><input name="gyazo_token" value="#{h @conf['gyazo_token']}" size=64></p>|
 	r << %Q|<h3 class="subtitle">Max images in list</h3>|
-	r << %Q|<p><input name="gyazo_token" value="#{h @conf['gyazo_max_images']}" size=3></p>|
+	r << %Q|<p><input name="gyazo_max_images" value="#{h @conf['gyazo_max_images']}" size=3></p>|
 	r << %Q|<h3 class="subtitle">Max image size</h3>|
-	r << %Q|<p><input name="gyazo_token" value="#{h @conf['gyazo_max_size']}" size=4> px</p>|
+	r << %Q|<p><input name="gyazo_max_size" value="#{h @conf['gyazo_max_size']}" size=4> px</p>|
+	r << %Q|<h3 class="subtitle">Clear cache</h3>|
+	r << %Q|<p><label for="gyazo_clear_cache">|
+	r << %Q|<input type="checkbox" id="gyazo_clear_cache" name="gyazo_clear_cache" value="true">|
+	r << %Q| Clear all cached OEmbed data</label></p>|
 	r
 end