From aa87ec15b074880d6bcf2fd57e50dbab2f6d3d74 Mon Sep 17 00:00:00 2001
From: Lars Jung <lrsjng@gmail.com>
Date: Sun, 29 May 2016 17:35:15 +0200
Subject: [PATCH] Add fallback mode.

---
 CHANGELOG.md                                 | 2 ++
 src/_h5ai/private/conf/options.json          | 2 ++
 src/_h5ai/private/php/class-bootstrap.php    | 1 +
 src/_h5ai/private/php/core/class-context.php | 8 ++++++++
 src/_h5ai/private/php/core/class-setup.php   | 1 +
 src/_h5ai/private/php/pages/page.tpl.jade    | 4 ++++
 6 files changed, 18 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 642b6395..dd06e2f9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,7 @@
 # Changelog
 
+* adds `view.fallbackMode` option to generally serve only fallback mode
+* serves fallback mode for text browsers (`curl`, `links`, `lynx`, `w3m`)
 * change type `txt-svg` to `img-svg`, no thumbs but preview
 * fixes a tree indentaion glitch
 * fixes shell command detection on Windows
diff --git a/src/_h5ai/private/conf/options.json b/src/_h5ai/private/conf/options.json
index 1ef43d17..9f1c9dcd 100644
--- a/src/_h5ai/private/conf/options.json
+++ b/src/_h5ai/private/conf/options.json
@@ -32,6 +32,7 @@
     General view options.
 
     - binaryPrefix: boolean, set to true uses 1024B=1KiB when formatting file sizes (see http://en.wikipedia.org/wiki/Binary_prefix)
+    - fallbackMode: boolean, serve fallback mode
     - fastBrowsing: boolean, use History API if available (no need to reload the whole page)
     - fonts: array of strings, fonts to use in regular context
     - fontsMono: array of strings, fonts to use in monopspaced context
@@ -58,6 +59,7 @@
     */
     "view": {
         "binaryPrefix": false,
+        "fallbackMode": false,
         "fastBrowsing": true,
         "fonts": ["Ubuntu", "Roboto", "Helvetica", "Arial", "sans-serif"],
         "fontsMono": ["Ubuntu Mono", "Monaco", "Lucida Sans Typewriter", "monospace"],
diff --git a/src/_h5ai/private/php/class-bootstrap.php b/src/_h5ai/private/php/class-bootstrap.php
index 67df539e..3afd7ba4 100644
--- a/src/_h5ai/private/php/class-bootstrap.php
+++ b/src/_h5ai/private/php/class-bootstrap.php
@@ -24,6 +24,7 @@ class Bootstrap {
         } else {
             $public_href = $setup->get('PUBLIC_HREF');
             $x_head_tags = $context->get_x_head_html();
+            $fallback_mode = $context->is_fallback_mode();
             $fallback_html = (new Fallback($context))->get_html();
             require __DIR__ . '/pages/index.php';
         }
diff --git a/src/_h5ai/private/php/core/class-context.php b/src/_h5ai/private/php/core/class-context.php
index 18fe487a..5484f8f9 100644
--- a/src/_h5ai/private/php/core/class-context.php
+++ b/src/_h5ai/private/php/core/class-context.php
@@ -68,6 +68,14 @@ class Context {
         return Util::starts_with($this->setup->get('REQUEST_HREF') . '/', $this->setup->get('PUBLIC_HREF'));
     }
 
+    public function is_text_browser() {
+        return preg_match('/curl|links|lynx|w3m/i', $this->setup->get('HTTP_USER_AGENT')) === 1;
+    }
+
+    public function is_fallback_mode() {
+        return $this->query_option('view.fallbackMode', false) || $this->is_text_browser();
+    }
+
     public function to_href($path, $trailing_slash = true) {
         $rel_path = substr($path, strlen($this->setup->get('ROOT_PATH')));
         $parts = explode('/', $rel_path);
diff --git a/src/_h5ai/private/php/core/class-setup.php b/src/_h5ai/private/php/core/class-setup.php
index b9219c70..8b836db8 100644
--- a/src/_h5ai/private/php/core/class-setup.php
+++ b/src/_h5ai/private/php/core/class-setup.php
@@ -53,6 +53,7 @@ class Setup {
         $this->set('REQUEST_HREF', parse_url(getenv('REQUEST_URI'), PHP_URL_PATH));
         $this->set('SCRIPT_NAME', getenv('SCRIPT_NAME'));
         $this->set('SERVER_SOFTWARE', getenv('SERVER_SOFTWARE'));
+        $this->set('HTTP_USER_AGENT', getenv('HTTP_USER_AGENT'));
     }
 
     private function add_php_checks() {
diff --git a/src/_h5ai/private/php/pages/page.tpl.jade b/src/_h5ai/private/php/pages/page.tpl.jade
index 6d61259d..c7a4333a 100644
--- a/src/_h5ai/private/php/pages/page.tpl.jade
+++ b/src/_h5ai/private/php/pages/page.tpl.jade
@@ -14,14 +14,18 @@ html(class='no-js', lang='en')
         link(rel='shortcut icon', href!='<?= $public_href; ?>images/favicon/favicon-16-32.ico')
         link(rel='apple-touch-icon-precomposed', type='image/png', href!='<?= $public_href; ?>images/favicon/favicon-152.png')
         link(rel='stylesheet', href!='<?= $public_href; ?>css/styles.css')
+        <?php if (!$fallback_mode) { ?>
         script(src!='<?= $public_href; ?>js/scripts.js', data-module='#{module}')
         <?= $x_head_tags; ?>
+        <?php } ?>
 
     body#root(class='#{module}')
 
         div#fallback-hints
+            <?php if (!$fallback_mode) { ?>
             span.noJsMsg Works best with JavaScript enabled!
             span.noBrowserMsg Works best in #[a(href='http://browsehappy.com') modern browsers]!
+            <?php } ?>
             span.backlink #[a(href='#{pkg.homepage}', title='h5ai v#{pkg.version} - #{pkg.description}') powered by h5ai]
 
         block body