4 files changed, 35 insertions, 26 deletions

diff --git a/CHANGES.md b/CHANGES.md
index a3f4466..b41d2f0 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -10,6 +10,8 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 - *Website Feature:* new default plugin `copy-code` to copy code blocks content in one click
 - *Website Feature:* new default plugin `heading-anchors` to have clickable headings
 - *Website Feature:* `fontsettings` is now only controlling the font size, and can work on multiple themes
+- *Plugin API*: hook `page` can no longer modify the content, only the page's attributes
+- *Plugin API*: plugins can no longer export resources, instead use the `_assets` folder
 
 ## 3.2.0
 - Switch markdown parser from `kramed` to `markup-it`
diff --git a/packages/gitbook/src/api/decodePage.js b/packages/gitbook/src/api/decodePage.js
index 4fd78af..395c8ff 100644
--- a/packages/gitbook/src/api/decodePage.js
+++ b/packages/gitbook/src/api/decodePage.js
@@ -1,14 +1,14 @@
-const deprecate = require('./deprecate');
+const Immutable = require('immutable');
 
 /**
-    Decode changes from a JS API to a page object.
-    Only the content can be edited by plugin's hooks.
-
-    @param {Output} output
-    @param {Page} page: page instance to edit
-    @param {Object} result: result from API
-    @return {Page}
-*/
+ * Decode changes from a JS API to a page object.
+ * Only the content can be edited by plugin's hooks.
+ *
+ * @param {Output} output
+ * @param {Page} page: page instance to edit
+ * @param {Object} result: result from API
+ * @return {Page}
+ */
 function decodePage(output, page, result) {
     const originalContent = page.getContent();
 
@@ -18,7 +18,9 @@ function decodePage(output, page, result) {
         return page;
     }
 
-    deprecate.disable('page.sections');
+    // Update page attributes
+    const newAttributes = Immutable.fromJS(page.attributes);
+    page = page.set('attributes', newAttributes);
 
     // GitBook 3
     // Use returned page.content if different from original content
@@ -26,18 +28,6 @@ function decodePage(output, page, result) {
         page = page.set('content', result.content);
     }
 
-    // GitBook 2 compatibility
-    // Finally, use page.sections
-    else if (result.sections) {
-        page = page.set('content',
-            result.sections.map(function(section) {
-                return section.content;
-            }).join('\n')
-        );
-    }
-
-    deprecate.enable('page.sections');
-
     return page;
 }
 
diff --git a/packages/gitbook/src/api/encodeGlobal.js b/packages/gitbook/src/api/encodeGlobal.js
index 18ebdf0..89db629 100644
--- a/packages/gitbook/src/api/encodeGlobal.js
+++ b/packages/gitbook/src/api/encodeGlobal.js
@@ -36,6 +36,22 @@ function encodeGlobal(output) {
         summary: encodeSummary(output, book.getSummary()),
 
         /**
+         * Return absolute path to the root folder of the book
+         * @return {String}
+         */
+        root() {
+            return book.getRoot();
+        },
+
+        /**
+         * Return absolute path to the root folder of the book (for content)
+         * @return {String}
+         */
+        contentRoot() {
+            return book.getContentRoot();
+        },
+
+        /**
          * Check if the book is a multilingual book.
          * @return {Boolean}
          */
diff --git a/packages/gitbook/src/json/encodePage.js b/packages/gitbook/src/json/encodePage.js
index 6610308..0671721 100644
--- a/packages/gitbook/src/json/encodePage.js
+++ b/packages/gitbook/src/json/encodePage.js
@@ -13,7 +13,11 @@ function encodePage(page, summary, urls) {
     const attributes = page.getAttributes();
     const article = summary.getByPath(file.getPath());
 
-    const result = attributes.toJS();
+    const result = {
+        content:    page.getContent(),
+        dir:        page.getDir(),
+        attributes: attributes.toJS()
+    };
 
     if (article) {
         result.title = article.getTitle();
@@ -31,9 +35,6 @@ function encodePage(page, summary, urls) {
         }
     }
 
-    result.content = page.getContent();
-    result.dir = page.getDir();
-
     return result;
 }