Starting August 15th, the AWS Product Advertising API, as the former E-Commerce Service is now called, will only accept signed requests. The plugin will stop working if you don’t update. Thus I needed to re-engineer a few functions of my WordPress Amazon Machine Tags Plugin.

What you need to do is:

• Update to version 3.0 of the plugin.
• If you didn’t adapt any files just overwrite them. If you customized the CSS or XSL files, take care that you don’t overwrite yours. Also the XSL namespace must reflect the API version used in the plugin (2009-07-01), i.e. xmlns:aws= "http://webservices.amazon.com/ AWSECommerceService/ 2009-07-01"
• Get your Secret Access Key in addition to your existing Access Key ID. Your future requests will be signed using the secret key.
• Go to the plugin’s admin interface and enter the secret key.
• Some people experienced a few minutes where the items didn’t show up, instead they got the untransformed XML code. After a few minutes the problem resolved itself. My guess is that Amazon cached the XSL files, the versions mismatched, therefore the XML wasn’t transformed. That’s why I renamed the XSL files so that the new ones will be used. If you want to be sure, also delete the cached files amtap-aws-items-for-post-*.html in your wp-content/cache directory.

If you encounter any problems with the update, re-install the old version and let me know what went wrong so that we can fix it together until August 15th.

You can also support the plugin by translating it. There’s an empty PO file in the package. With a tool such as Poedit it’s fairly easy to translate everything. Thanks.

1. Let’s start with the simplest transformation, pulling the number of people who have bookmarked your post on del.icio.us. There are two components: one line of PHP code to insert the result in the footer of a page (found in template file single.php), and a few lines of XSLT for the transformation:

   1. <?php inlineRSS(
   2. 'delicious-incoming-' . $id,
'http://feeds.delicious.com/rss/url?url=' . get_permalink(), 60, 'inline-rss-linked.xslt');
   3. ?>

   The function inlineRSS() takes four arguments: the filename where you want to cache the result, the feed URI, the time to cache in minutes, and the filename of the transformation stylesheet. The latter has to be in the same directory as inlineRSS.php (the plugin).

   1. <xsl:template match="/rdf:RDF">
   2. <xsl:if test="count( rss:item ) &gt; 0">
   3. Saved by <span class="linked-in"><xsl:value-of select="count( rss:item )" /></span> other people.
   4. </xsl:if>
   5. </xsl:template>

   Download: inline-rss-linked.xslt

2. In the sidebar of this blog you see a section “current reading” which displays my latest five del.icio.us entries I have tagged with show-in-blog. Because I’m too lazy to add a description on del.icio.us there is just the title and the tags, minus “show-in-blog.” Here is the code for sidebar.php:

   1. <?php inlineRSS(
   2. 'delicious-links',
'http://feeds.delicious.com/rss/ your-delicious-name/show-in-blog', 60, 'inline-rss-delicious.xslt');
   3. ?>

   Of course “your-delicious-name” needs to be replaced.

   Download: inline-rss-delicious.xslt

3. Finally there is a list of my upcoming events, including microformatted semantic information. The XSLT is a little longer, but not really complicated. You just need to replace the upcoming ID with your own.

   1. <?php inlineRSS(
   2. 'upcoming',
'http://upcoming.yahoo.com/ syndicate/v2/ my_events/ 123456', 60, 'inline-rss-upcoming.xslt');
   3. ?>

   Download: inline-rss-upcoming.xslt

I’d like to point out that this is certainly not the only, and perhaps not even the best way to implement feeds into your site, but it’s pretty convenient once you’ve installed inlineRSS.

Chris Heilmann approaches the issue with a client side plugin to distribute tasks from the server to the client. His JavaScript is insofar unobtrusive as the list of inline del.icio.us links is replaced with an external link to his del.icio.us category, but then you give away the responsibility that the list is accessible as well. That’s why I would prefer a server side solution.

Ed Eliot has written a script to create a very pretty server side del.icio.us badge that I highly recommend, but it’s not as universal as the inlineRSS plugin, and it’s not a WordPress plugin to begin with (the same applies to his neat SimpleRSS script). But both Chris’ and Ed’s solutions are decent alternatives to take into consideration.

In this article

• Introduction
• Installation
• FAQ
• Changelog
• Discussion

Introduction

I always wanted to implement one thing since I started the blog: a simple inclusion of Amazon items. I didn’t want to search through results that existing plugins provided. When I wrote about something like a book, I already used machine tags to identify the subject! So I found the inspiration to write my first real WordPress plugin: Amazon Machine Tags.

Here’s what it does:

1. It identifies any tag in the machine (or triple) tag form book:isbn=1234567890 or amazon:asin=1234567890. That works with native tags from WordPress 2.3 and later, Bunny’s Technorati Tags, Jerome’s Keywords, or as inline text (see below).
2. Then it gets the item information and a thumbnail image from the Amazon Web Services API. That’s the real thing including prices and such, no cheap RSS feed.

3. The item(s) are displayed in the sidebar or in a blog article with a link to the visitor’s best match (if the ip2country plugin is installed) or a default Amazon shop of your choice. See examples in the sidebar.

   The “best match” is based on the visitor’s location. If she is from one of the six countries where Amazon has shops, that locale is chosen. If he is from Europe, the preferred language is matched to either France, Germany, or UK, with UK as default. If it’s neither a locale nor Europe, amazon.com is the default. Based on your location, do you think that’s a reasonable approach?

   Note that some items, like books in any language other than English, are only available from certain locales, so a visitor from the UK might not see German books you recommend.

4. If you are an Amazon Associate for that locale, your Associate ID is included automatically.

You can edit the server-side, semantic and valid XHTML output via XSLT, change the CSS, or translate the admin interface through .po files. Actually Amazon loads the XSLT file from your server and processes it on theirs, so you shouldn’t block HTTP access to the plugin directory, and localhost doesn’t work either.

Results can be cached for anything between one second and one hour, so you don’t need to worry even when you run an extremely popular blog.

The YUI Connection Manager is included to verify the Access Key in the admin interface via REST and unobtrusive AJAX.

I hope this little piece of software serves you well and you like it.

Installation

1. Get the latest version of the plugin from the WordPress site.
2. Upload the whole amazon-machine-tags folder into the /wp-content/plugins/ directory.
3. Activate the plugin through the “Plugins” menu in WordPress.
4. Get an Amazon Web Services Access Key.
5. Create a wp-content/cache/ directory with permissions set to 755, or 777 if you create the directory as root user.
6. Put <?php AMTAP::get_items(); ?> in your sidebar and start using machine tags.
7. Edit amtap-blog.css if you like.
8. If you want to use tags in a blog article, write [amtap book:isbn=1234567890] or [amtap amazon:asin=1234567890]. Thanks to paulinepauline for that idea.

Frequently Asked Questions

Does it work in the sidebar on Pages, too?

Posts have tags, pages don’t, so it doesn’t work on those by default. But there’s a plugin called tags4page that enables tags for pages. Works like a charm.

Is there a limit of how many items can be requested?

Yes, Amazon has a limit of 10 items per request. Since they are separate requests, you can use a maximum of 10 items in the content plus a maximum of 10 in the sidebar.

Would it be possible to cache the images?

Technically it wouldn’t be a problem, but the Amazon Web Services license explicitly forbids caching of images (see 5.1.10). Sorry.

I need to a larger thumbnail (medium), but can’t seem to find a place to edit the size of the image being requested.

The image size can be edited in the XSLT. The original result is a XML file that is transformed by Amazon using your local copy of amtap-html-sidebar.xsl and amtap-html-content.xsl, respectively. Replacing every occurance of .//aws:TinyImage with .//aws:MediumImage should do the trick.

You can view the original XML when you activate the “debug” option in the admin interface so that the request string is printed as a comment in the sidebar’s source code. XSLT is a very powerful tool, and there’s a lot more in the XML, for example customer reviews.

Are all options really required?

No. The only required field is the Amazon Web Services Access Key. You can leave the others, they are set to defaults then.

Changelog

• 3.0 (2009-07-31): Added signed requests for the new Amazon authorization requirement. Updated the API version to 2009-07-01 (please note: if you use your own XSL files, you must update the version in the XML namespace URL). Updated links.
• 2.0 (2008-07-18):
  1. Added fields for editing the sidebar headline, link target, and displaying rating stars.
  2. Added an error message if the plugin is run from a private IP address space like localhost.
  3. Changed priorities for price selection, they are now: LowestNewPrice, ListPrice, first offer, LowestUsedPrice.
  4. Added support for the display of an artist name.
  5. Added rating stars.
  6. Fixed EAN numbers with a dash.
  7. Fixed cutting of titles after a period.
  8. Changed CSS and XSL files. Take care when you edited those.
• 1.1.3: Changed amtap-admin.css and amtap-admin.inc.php to make the admin interface look prettier with WordPress 2.5.
• 1.1.2: Fixed a bug in amtap.php when there are no other tags but default tags.
• 1.1.1: Fixed the sort order of inline items, a bug for returning an error message when the cache file is not writable, and added Amazon’s limit of 10 items per request.
• 1.1.0: Fixed the display of inline tags on the home page. Improved regular expression for filtering inline tags.
• 1.0.6: Fixed a bug introduced through the new default items function when there were no items to be displayed in the sidebar.
• 1.0.5: Added an option for default items on every page. Changed amtap-html-sidebar.xsl to sort items in the order of the request.
• 1.0.4: Bugfix for replacement of dollar characters in content. Also content items are now cached separately.
• 1.0.3: Fixed the display of inline tags on category pages.
• 1.0.2: Changed the plugin path from amtap to amazon-machine-tags for consistency with the file structure in the zipped file.
• 1.0.1: Bugfix for native WordPress tags.