Improve legacy photo post special handling (#167)

README.md

@@ -1,6 +1,6 @@
 # tumblr.js
 
-[![Build Status](https://github.com/tumblr/tumblr.js/actions/workflows/ci.yaml/badge.svg)](https://github.com/tumblr/tumblr.js/actions/workflows/ci.yaml)
+[![CI](https://github.com/tumblr/tumblr.js/actions/workflows/ci.yaml/badge.svg)](https://github.com/tumblr/tumblr.js/actions/workflows/ci.yaml)
 
 The official JavaScript client library for the [Tumblr API](http://www.tumblr.com/docs/api/v2).
 Check out the [detailed documentation here](https://tumblr.github.io/tumblr.js/index.html).

lib/tumblr.js

@@ -271,7 +271,20 @@ class TumblrClient {
       if (data.has('data') || data.has('data64')) {
         const form = new FormData();
 
-        const isLegacyPhotoPost = url.pathname.endsWith('/post') && data.get('type') === 'photo';
+        // Legacy photo posts may need special handling to transform the data array of images so form-data can handle it
+        let isLegacyPhotoPost = false;
+        if (data.get('type') === 'photo') {
+          // Check for `/v2/blog/BLOG_ID/post`
+          const pathParts = (
+            url.pathname.endsWith('/') ? url.pathname.slice(0, -1) : url.pathname
+          ).split('/');
+
+          isLegacyPhotoPost =
+            pathParts.length === 5 &&
+            pathParts[1].toLowerCase() === 'v2' &&
+            pathParts[2].toLowerCase() === 'blog' &&
+            pathParts[4].toLowerCase() === 'post';
+        }
 
         for (const [key, value] of data.entries()) {
           // Legacy photo post creation has a special case to accept `data`.