Custom fetch method

README.md

@@ -69,7 +69,10 @@ Link Tool supports these configuration parameters:
 
 | Field    | Type        | Description                                    |
 | ---------|-------------|------------------------------------------------|
-| endpoint | `string`    | **Required:** endpoint for link data fetching. |
+| endpoint | `string`    | Endpoint for link data fetching. |
+| fetcher | `{{fetchLinkDataForUrl: function}}`    | Optional custom fetch function. See details below. |
+
+Note that if you don't implement your custom fetch method, the `endpoint` parameter is required.
 
 ## Output data
 
@@ -131,3 +134,6 @@ Currently title, image and description fields are supported by plugin's design .
 }
 ```
 Also, can contain any additional fields you want to store. 
+
+## Providing custom fetch method
+You have the option to provide your own custom fetch method. Use the `fetcher` config parameter with an object with a `fetchLinkDataForUrl` method that takes the url as a parameter and returns a Promise that resolves with response in the format described above.

src/index.js

@@ -65,7 +65,8 @@ export default class LinkTool {
      * Tool's initial config
      */
     this.config = {
-      endpoint: config.endpoint || ''
+      endpoint: config.endpoint || '',
+      fetcher: config.fetcher || undefined
     };
 
     this.nodes = {
@@ -347,13 +348,18 @@ export default class LinkTool {
     this.data = { link: url };
 
     try {
-      const response = await (ajax.get({
-        url: this.config.endpoint,
-        data: {
-          url
-        }
-      }));
-
+      let response;
+
+      if (this.config.fetcher && typeof this.config.fetcher.fetchLinkDataForUrl === 'function') {
+        response = await (this.config.fetcher.fetchLinkDataForUrl(url));
+      } else {
+        response = await (ajax.get({
+          url: this.config.endpoint,
+          data: {
+            url
+          }
+        }));
+      }
       this.onFetch(response);
     } catch (error) {
       this.fetchingFailed('Haven\'t received data from server');