From a1c7a095ee83bbda5b68c4b1a2796ed409ab345d Mon Sep 17 00:00:00 2001
From: ed <s@ocv.me>
Date: Thu, 19 Jun 2025 17:07:06 +0000
Subject: [PATCH] textfile-streaming fixes;

* give up on disconnect
* block scrapers from tailing
* prism throws on window-resize if riced object has poofed
* fix prism-init race
---
 copyparty/__main__.py    |  2 +-
 copyparty/httpcli.py     |  4 ++++
 copyparty/web/browser.js | 25 ++++++++++++++++++-------
 copyparty/web/util.js    |  2 +-
 4 files changed, 24 insertions(+), 9 deletions(-)

diff --git a/copyparty/__main__.py b/copyparty/__main__.py
index 4d6417bc..c707033c 100644
--- a/copyparty/__main__.py
+++ b/copyparty/__main__.py
@@ -1600,7 +1600,6 @@ def run_argparse(
     add_db_metadata(ap)
     add_thumbnail(ap)
     add_transcoding(ap)
-    add_tail(ap)
     add_rss(ap)
     add_ftp(ap)
     add_webdav(ap)
@@ -1615,6 +1614,7 @@ def run_argparse(
     add_hooks(ap)
     add_stats(ap)
     add_txt(ap)
+    add_tail(ap)
     add_og(ap)
     add_ui(ap, retry)
     add_admin(ap)
diff --git a/copyparty/httpcli.py b/copyparty/httpcli.py
index b35fb695..d490f19c 100644
--- a/copyparty/httpcli.py
+++ b/copyparty/httpcli.py
@@ -3815,6 +3815,10 @@ class HttpCli(object):
         return txt
 
     def _can_tail(self, volflags: dict[str, Any]) -> bool:
+        zp = self.args.ua_nodoc
+        if zp and zp.search(self.ua):
+            t = "this URL contains no valuable information for bots/crawlers"
+            raise Pebkac(403, t)
         lvl = volflags["tail_who"]
         if "notail" in volflags or not lvl:
             raise Pebkac(400, "tail is disabled in server config")
diff --git a/copyparty/web/browser.js b/copyparty/web/browser.js
index 0f82436c..35fc6707 100644
--- a/copyparty/web/browser.js
+++ b/copyparty/web/browser.js
@@ -5817,7 +5817,9 @@ var fileman = (function () {
 
 
 var showfile = (function () {
-	var r = {};
+	var r = {
+		'nrend': 0,
+	};
 	r.map = {
 		'.ahk': 'autohotkey',
 		'.bas': 'basic',
@@ -5956,10 +5958,10 @@ var showfile = (function () {
 				ro.read().then(function(v) {
 					if (r.tail_id != me)
 						return;
-					v = v.value;
-					if (v == '\x00')
+					var vt = v.done ? '\n*** lost connection to copyparty ***' : v.value;
+					if (vt == '\x00')
 						return rf();
-					txt += v;
+					txt += vt;
 					var ofs = txt.length - r.tailnb;
 					if (ofs > 0) {
 						var ofs2 = txt.indexOf('\n', ofs);
@@ -5973,7 +5975,8 @@ var showfile = (function () {
 					edoc.innerHTML = html;
 					if (r.tail2end)
 						window.scrollTo(0, wfp.offsetTop - window.innerHeight);
-					rf();
+					if (!v.done)
+						rf();
 				});
 			};
 			if (r.tail_id == me)
@@ -6036,6 +6039,7 @@ var showfile = (function () {
 
 	function render(doc, no_push) {
 		r.q = null;
+		r.nrend++;
 		var url = r.url = doc[0],
 			lnh = doc[1],
 			txt = doc[2],
@@ -6050,9 +6054,13 @@ var showfile = (function () {
 		ebi('editdoc').style.display = (has(perms, 'write') && (is_md || has(perms, 'delete'))) ? '' : 'none';
 
 		var wr = ebi('bdoc'),
+			nrend = r.nrend,
 			defer = !Prism.highlightElement;
 
 		var fun = function (el) {
+			if (r.nrend != nrend)
+				return;
+
 			try {
 				if (lnh.slice(0, 5) == '#doc.')
 					sethash(lnh.slice(1));
@@ -6065,8 +6073,11 @@ var showfile = (function () {
 			catch (ex) { }
 		}
 
-		if (!txt || txt.length > 1024 * 256)
+		var skip_prism = !txt || txt.length > 1024 * 256;
+		if (skip_prism) {
 			fun = function (el) { };
+			is_md = false;
+		}
 
 		qsr('#doc');
 		var el = mknod('pre', 'doc');
@@ -6078,7 +6089,7 @@ var showfile = (function () {
 		else {
 			el.textContent = txt;
 			el.innerHTML = '<code>' + el.innerHTML + '</code>';
-			if (!window.no_prism) {
+			if (!window.no_prism && !skip_prism) {
 				if ((lang == 'conf' || lang == 'cfg') && ('\n' + txt).indexOf('\n# -*- mode: yaml -*-') + 1)
 					lang = 'yaml';
 
diff --git a/copyparty/web/util.js b/copyparty/web/util.js
index 0ee7c637..ae4590ed 100644
--- a/copyparty/web/util.js
+++ b/copyparty/web/util.js
@@ -183,7 +183,7 @@ function vis_exh(msg, url, lineNo, columnNo, error) {
     if (url.indexOf(' > eval') + 1 && !evalex_fatal)
         return;  // md timer
 
-    if (IE && url.indexOf('prism.js') + 1)
+    if (url.indexOf('prism.js') + 1)
         return;
 
     if (url.indexOf('easymde.js') + 1)