fix: Fix inaccessible content on public pages due to overlapping footer

Signed-off-by: Christopher Ng <chrng8@gmail.com>

4 files changed, 33 insertions, 12 deletions

diff --git a/core/Listener/BeforeTemplateRenderedListener.php b/core/Listener/BeforeTemplateRenderedListener.php
index e3533f1c6ce..4ce892664e9 100644
--- a/core/Listener/BeforeTemplateRenderedListener.php
+++ b/core/Listener/BeforeTemplateRenderedListener.php
@@ -33,6 +33,10 @@ class BeforeTemplateRenderedListener implements IEventListener {
 			Util::addScript('core', 'unsupported-browser-redirect');
 		}
 
+		if ($event->getResponse()->getRenderAs() === TemplateResponse::RENDER_AS_PUBLIC) {
+			Util::addScript('core', 'public');
+		}
+
 		\OC_Util::addStyle('server', null, true);
 
 		if ($event instanceof BeforeLoginTemplateRenderedEvent) {
diff --git a/core/css/public.scss b/core/css/public.scss
index 79f406b44d5..80743246876 100644
--- a/core/css/public.scss
+++ b/core/css/public.scss
@@ -3,19 +3,9 @@
  * SPDX-License-Identifier: AGPL-3.0-or-later
  */
 #body-public {
-	--footer-height: calc(var(--default-line-height) + 2 * var(--default-grid-baseline));;
-
-	&:has(.footer__legal-links),
-	&:has(.footer__simple-sign-up) {
-		--footer-height: calc(2 * var(--default-line-height) + 3 * var(--default-grid-baseline));;
-	}
-
-	&:has(.footer__legal-links):has(.footer__simple-sign-up) {
-		--footer-height: calc(3 * var(--default-line-height) + 3 * var(--default-grid-baseline));
-	}
+	--footer-height: calc(2lh + 2 * var(--default-grid-baseline)); // Set the initial value, will be updated programmatically to match the actual height
 
 	.header-end {
-
 		#header-primary-action a {
 			color: var(--color-primary-element-text);
 		}
@@ -51,6 +41,7 @@
 
 	#content {
 		min-height: var(--body-height, calc(100% - var(--footer-height)));
+		padding-block-end: var(--footer-height);
 	}
 
 	#app-content-vue {
@@ -89,7 +80,6 @@
 		align-items: center;
 		justify-content: center;
 
-		height: var(--footer-height);
 		width: calc(100% - 2 * var(--body-container-margin));
 		margin-inline: var(--body-container-margin);
 		padding-block: var(--default-grid-baseline);
diff --git a/core/src/public.ts b/core/src/public.ts
new file mode 100644
index 00000000000..ce4af8aa2ac
--- /dev/null
+++ b/core/src/public.ts
@@ -0,0 +1,26 @@
+/**
+ * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+const body = document.body
+const footer = document.querySelector('footer')
+let prevHeight = footer?.offsetHeight
+
+const onResize: ResizeObserverCallback = (entries) => {
+	for (const entry of entries) {
+		const height = entry.contentRect.height
+		if (height === prevHeight) {
+			return
+		}
+		prevHeight = height
+		body.style.setProperty('--footer-height', `${height}px`)
+	}
+}
+
+if (footer) {
+	new ResizeObserver(onResize)
+		.observe(footer, {
+			box: 'border-box', // <footer> is border-box
+		})
+}
diff --git a/webpack.modules.js b/webpack.modules.js
index 577f6f4a852..305bb4bafcd 100644
--- a/webpack.modules.js
+++ b/webpack.modules.js
@@ -26,6 +26,7 @@ module.exports = {
 		'legacy-unified-search': path.join(__dirname, 'core/src', 'legacy-unified-search.js'),
 		'unsupported-browser': path.join(__dirname, 'core/src', 'unsupported-browser.js'),
 		'unsupported-browser-redirect': path.join(__dirname, 'core/src', 'unsupported-browser-redirect.js'),
+		public: path.join(__dirname, 'core/src', 'public.ts'),
 	},
 	dashboard: {
 		main: path.join(__dirname, 'apps/dashboard/src', 'main.js'),