🐛 Fixed editor showing incorrect domain and "unsaved changes" modal for relative links

no issue

- convert relative links to absolute based on the configured blog url when displaying URLs in the link toolbar and when manually setting a relative link
  - converting to absolute in the editor prevents the in-memory mobiledoc getting out of sync with the server response when it converts relative urls to absolute

lib/koenig-editor/addon/components/koenig-link-input.js

@@ -1,10 +1,12 @@
 import Component from '@ember/component';
 import layout from '../templates/components/koenig-link-input';
+import relativeToAbsolute from '../lib/relative-to-absolute';
 import {TOOLBAR_MARGIN} from './koenig-toolbar';
 import {computed} from '@ember/object';
 import {getLinkMarkupFromRange} from '../utils/markup-utils';
 import {htmlSafe} from '@ember/string';
 import {run} from '@ember/runloop';
+import {inject as service} from '@ember/service';
 
 // pixels that should be added to the `left` property of the tick adjustment styles
 // TODO: handle via CSS?
@@ -26,6 +28,8 @@ function getScrollParent(node) {
 }
 
 export default Component.extend({
+    config: service(),
+
     layout,
 
     attributeBindings: ['style'],
@@ -120,7 +124,8 @@ export default Component.extend({
                 // prevent Enter from triggering in the editor and removing text
                 event.preventDefault();
 
-                let href = this.href;
+                let href = relativeToAbsolute(this.href, this.config.get('blogUrl'));
+                this.set('href', href);
 
                 // create a single editor runloop here so that we don't get
                 // separate remove and replace ops pushed onto the undo stack

lib/koenig-editor/addon/components/koenig-link-toolbar.js

@@ -1,10 +1,11 @@
 import Component from '@ember/component';
 import layout from '../templates/components/koenig-link-toolbar';
-// import {TOOLBAR_MARGIN} from './koenig-toolbar';
+import relativeToAbsolute from '../lib/relative-to-absolute';
 import {computed} from '@ember/object';
 import {getEventTargetMatchingTag} from 'mobiledoc-kit/utils/element-utils';
 import {htmlSafe} from '@ember/string';
 import {run} from '@ember/runloop';
+import {inject as service} from '@ember/service';
 
 // gap between link and toolbar bottom
 const TOOLBAR_MARGIN = 8;
@@ -17,6 +18,8 @@ const TOOLBAR_PADDING = 12;
 const DELAY = 120;
 
 export default Component.extend({
+    config: service(),
+
     layout,
 
     attributeBindings: ['style'],
@@ -163,8 +166,12 @@ export default Component.extend({
     },
 
     _showToolbar(target) {
+        // extract the href attribute value and convert it to absolute based
+        // on the configured blog url
         this._target = target;
-        this.set('url', target.href);
+        let href = target.getAttribute('href');
+        let blogUrl = this.config.get('blogUrl');
+        this.set('url', relativeToAbsolute(href, blogUrl));
         this.set('showToolbar', true);
         run.schedule('afterRender', this, function () {
             this._positionToolbar(target);

lib/koenig-editor/addon/lib/relative-to-absolute.js

@@ -0,0 +1,29 @@
+export default function relativeToAbsolute(path, rootUrl) {
+    // if URL is absolute return it as-is
+    try {
+        const parsed = new URL(path, 'http://relative');
+
+        if (parsed.origin !== 'http://relative') {
+            return path;
+        }
+
+        // Do not convert protocol relative URLs
+        if (path.lastIndexOf('//', 0) === 0) {
+            return path;
+        }
+    } catch (e) {
+        return path;
+    }
+
+    // return the path as-is if it's a pure hash param or not root-relative
+    if (!path.startsWith('/')) {
+        return path;
+    }
+
+    // force root to always have a trailing-slash for consistent behaviour
+    if (!rootUrl.endsWith('/')) {
+        rootUrl = `${rootUrl}/`;
+    }
+
+    return new URL(path, rootUrl).toString();
+}