{"id":8958,"date":"2012-09-27T17:11:35","date_gmt":"2012-09-27T11:41:35","guid":{"rendered":"http:\/\/www.tothenew.com\/blog\/?p=8958"},"modified":"2012-09-27T17:11:35","modified_gmt":"2012-09-27T11:41:35","slug":"cool-way-to-getset-processed-html-markup-in-filters","status":"publish","type":"post","link":"https:\/\/www.tothenew.com\/blog\/cool-way-to-getset-processed-html-markup-in-filters\/","title":{"rendered":"Cool way to get\/set processed HTML Markup in filters"},"content":{"rendered":"

Hi, <\/p>\n

 <\/p>\n

There was a case where i had to encrypt the HTML output of the GSP before displaying it to user. There are a lot of ways to do it, but i wanted to make is as simple as possible. Hence here is the pattern i used:<\/p>\n

 <\/p>\n

Note:<\/strong> This is just an example, you can use this concept to do thousands of cool things, like: pdf export etc.. <\/strong><\/p>\n

 <\/p>\n

ON THE GSP
\n[html]
\n<html>
\n<head>
\n<meta name="encrypt" value="true" \/>
\n …
\n<\/head>
\n …. misc code
\n<\/html>
\n[\/html]
\nHere what is did is, i created a GSP and just added a meta property to it saying “encrypt true”.<\/p>\n

 <\/p>\n

Now here is the Code for the Grails Filters (See inline comments)
\n[java]
\ndef filters = {
\n all(controller: ‘*’, action: ‘*’) {
\n before = {
\n }
\n after = { Map model ->
\n try {
\n \/\/Get the Site Mesh Page Instance
\n GSPSitemeshPage sitemeshPage = response?.getContent() as GSPSitemeshPage<\/p>\n

\/\/Check if it is actual sitemest page, not just plain rendered content
\n if (sitemeshPage && sitemeshPage.getPage()) {
\n \/\/Get the meta property value.
\n String metaPropValue = sitemeshPage.getProperty("meta.encrypt")
\n if (metaPropValue && metaPropValue == "true") {
\n \/\/This is how you can get html contents of head\/body after all tags resolved.
\n String head = new String(sitemeshPage.getHead())
\n String body = new String(sitemeshPage.getBody())<\/p>\n

\/\/Buffer for new body
\n StreamCharBuffer writer = new StreamCharBuffer()
\n \/\/Write to buffer new content
\n writer.getWriter().write(encryptionService.encrypt(body))
\n sitemeshPage.setBodyBuffer(writer)
\n }
\n }
\n } catch (Throwable ex) {
\n ex.printStackTrace()
\n }
\n }
\n afterView = { Exception e -><\/p>\n

}
\n }
\n }
\n[\/java]<\/p>\n

 <\/p>\n

And hence we have this processed content in response \ud83d\ude42<\/p>\n

 <\/p>\n

 <\/p>\n

Regards
\nKushal Likhi<\/p>\n","protected":false},"excerpt":{"rendered":"

Hi,   There was a case where i had to encrypt the HTML output of the GSP before displaying it to user. There are a lot of ways to do it, but i wanted to make is as simple as possible. Hence here is the pattern i used:   Note: This is just an example, […]<\/p>\n","protected":false},"author":28,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"iawp_total_views":4,"footnotes":""},"categories":[7],"tags":[1093,4840,9],"class_list":["post-8958","post","type-post","status-publish","format-standard","hentry","category-grails","tag-filters","tag-grails","tag-groovy"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t