Add customizable warnings shown on upload and download pages

server/clientConstants.js

@@ -15,6 +15,8 @@ module.exports = {
     FOOTER_SOURCE_URL: config.footer_source_url,
     CUSTOM_FOOTER_TEXT: config.custom_footer_text,
     CUSTOM_FOOTER_URL: config.custom_footer_url,
+    UPLOAD_AREA_WARNING_HTML: config.upload_area_warning_html,
+    DOWNLOAD_WARNING_HTML: config.download_warning_html,
     COLORS: {
       PRIMARY: config.ui_color_primary,
       ACCENT: config.ui_color_accent

server/config.js

@@ -175,7 +175,8 @@ const conf = convict({
   },
   custom_description: {
     format: String,
-    default: 'Encrypt and send files with a link that automatically expires to ensure your important documents don’t stay online forever.',
+    default:
+      'Encrypt and send files with a link that automatically expires to ensure your important documents don’t stay online forever.',
     env: 'CUSTOM_DESCRIPTION'
   },
   detect_base_url: {
@@ -263,6 +264,16 @@ const conf = convict({
     default: '',
     env: 'CUSTOM_FOOTER_URL'
   },
+  upload_area_warning_html: {
+    format: String,
+    default: '',
+    env: 'SEND_UPLOAD_AREA_WARNING_HTML'
+  },
+  download_warning_html: {
+    format: String,
+    default: '',
+    env: 'SEND_DOWNLOAD_WARNING_HTML'
+  },
   ui_color_primary: {
     format: String,
     default: '#0a84ff',