1 files changed, 28 insertions, 5 deletions
diff --git a/lib/plugins/plugin.js b/lib/plugins/plugin.js
index d4d2b23..05fa8ca 100644
--- a/lib/plugins/plugin.js
+++ b/lib/plugins/plugin.js
@@ -1,7 +1,9 @@
+var _ = require('lodash');
 var path = require('path');
 var resolve = require('resolve');
 
 var Promise = require('../utils/promise');
+var gitbook = require('../gitbook');
 
 var PLUGIN_PREFIX = 'gitbook-plugin-';
 
@@ -62,14 +64,35 @@ BookPlugin.prototype.load = function() {
         return true;
     })
 
-    .then(function() {
-        if (!that.isLoaded()) {
-            throw new Error('Couldn\'t locate plugin "' + that.id + '", Run \'gitbook install\' to install plugins from registry.');
-        }
-    });
+    .then(that.validate);
 
     this.log.info.log('Loading plugin "' + this.id + '" ...');
     return this.log.info.promise('', promise);
 };
 
+
+// Verify the definition of a plugin
+// Also verify that the plugin accepts the current gitbook version
+// This method throws erros if plugin is invalid
+BookPlugin.prototype.validate = function() {
+    var isValid = (
+        this.packageInfos &&
+        this.packageInfos.name &&
+        this.packageInfos.engines &&
+        this.packageInfos.engines.gitbook
+    );
+
+    if (!this.isLoaded()) {
+        throw new Error('Couldn\'t locate plugin "' + this.id + '", Run \'gitbook install\' to install plugins from registry.');
+    }
+
+    if (!isValid) {
+        throw new Error('Invalid plugin "' + this.id + '"');
+    }
+
+    if (!gitbook.satisfies(this.packageInfos.engines.gitbook)) {
+        throw new Error('GitBook doesn\'t satisfy the requirements of this plugin: '+this.packageInfos.engines.gitbook);
+    }
+};
+
 module.exports = BookPlugin;