Small fix for WordPress XML-RPC

I had the idea that I might photo blog more if there was an easy way to get photos off my iPhone and into a blog post.  The easiest way would be to e-mail the photo someplace for WordPress to get it.  Unfortunately, most of the e-mail to blog post plugins (and the built-in stuff) just sucks for my need.

I decided to look at the XML-RPC API to see if I could get it done that way, and then write a script to be called out of procmail to create the mail.  There is a function there that will do what I want, wp.uploadFile aka metaWeblog.newMediaObject.  The specification for that call says that the file being uploaded must be Base64 encoded.  No problem, a few line of ruby later and I have everything ready to test an upload.  The file goes up, but its unviewable in a browser.  A quick check of the file on the server and its revealed to be a text file filled with Baes64 looking data.  Somewhere along the line it wasn’t being decoded.

After about an hour of screwing around, I determined it wasn’t anything obvious in my code, so I thought I’d look at the code for WordPress 2.5.1 to see if I missed anything obvious.  In reading their code, I found that the WordPress folks forgot something obvious, their code never Base64 decodes it before it writes it to a file.  A quick one-line change later, and *boom* I’m off.

Here’s the patch in case its useful to anyone else. I’ll have the script up when I’m done with it.

(Also, in a small bit of embarrassment, I must admit fixing this took me 10 minutes longer than it should because I forgot ; is end of statement in PHP.)

Index: xmlrpc.php
--- xmlrpc.php  (revision 7840)
+++ xmlrpc.php  (working copy)
@@ -1880,6 +1880,10 @@
                        $name = "wpid{$old_file->ID}-{$filename}";
+                # The specification says that this is base64 encoded,
+                # we should really decode it.
+                $bits = base64_decode($bits);
                $upload = wp_upload_bits($name, $type, $bits);
                if ( ! empty($upload['error']) ) {
                        $errorString = sprintf(__('Could not write file %1$s (%2$s)'), $name, $upload['error']);

3 thoughts on “Small fix for WordPress XML-RPC”

  1. Daniel,

    Thanks! I missed that in all the documentation, I swear it isn’t there at all. Seems straighforward thought.

    In any case, I kinda abandoned tracking this down once the WordPress app for the iPhone came out. I did have to reverse this change, but I never looked into why as my needs were met. I am the lazy.

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