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From: Ihor Radchenko <yantar92@gmail.com>
To: Max Nikulin <manikulin@gmail.com>
Cc: emacs-orgmode@gnu.org
Subject: [PATCH v2] Re: [BUG] org-attach-id-ts-folder-format fails on customized IDs [9.6 (9.6-??-2e9999783)]
Date: Wed, 10 Aug 2022 19:43:37 +0800	[thread overview]
Message-ID: <87a68ce32u.fsf@localhost> (raw)
In-Reply-To: <871qtxhsm6.fsf@localhost>

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Ihor Radchenko <yantar92@gmail.com> writes:

>> Ihor, I am afraid of collisions due to short input to md5. Long hash 
>> value gives false impression of high entropy but actually there are not 
>> so many variants for 1 or 2 characters strings. Either there is no point 
>> in making long name from short id or random string of appropriate length 
>> should be used instead.
>
> Random is not an option. If we use random string, how will we get the
> right attachment path on a second call? This function must return the
> same value given the same input.
>
> Having said that, I do agree (taking into account the other comment)
> that md5 may not be a very good idea. Maybe simply something like
> "__/id". Ideally, we should be able to recover the original id from the
> path to attachment.

I have updated the patch to use "__/id" when id is too short.
Any objections?


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From 7ca5fe66c53a1399943a2e2d4a1675ca8cd14194 Mon Sep 17 00:00:00 2001
Message-Id: <7ca5fe66c53a1399943a2e2d4a1675ca8cd14194.1660131747.git.yantar92@gmail.com>
From: Ihor Radchenko <yantar92@gmail.com>
Date: Sat, 23 Jul 2022 13:13:24 +0800
Subject: [PATCH v2] org-attach-dir-from-id: Do not rely on ID being over 6
 chars long

* lisp/org-attach.el (org-attach-id-uuid-folder-format): Fall back to
"--/ID" when the ID contains 2 chars or less and cannot be split into
the "xy/z...." path.
(org-attach-id-ts-folder-format): Fall back to "unknown/ID" path
format when the ID contains less than 7 chars and cannot be split into
the "YYYYMM/rest" path.

Fixes https://orgmode.org/list/KC8PcypJapBpJQtJxM0kX5N7Z0THL2Lq6EQjBMzpw1-vgQf72egZ2JOIlTbPYiqAVD4MdSBhrhBZr2Ykf5DN1mocm1ANvvuKKZShlkgzKYM=@pm.me
---
 lisp/org-attach.el | 25 +++++++++++++++++--------
 1 file changed, 17 insertions(+), 8 deletions(-)

diff --git a/lisp/org-attach.el b/lisp/org-attach.el
index fe49af6f3..bb7c787f7 100644
--- a/lisp/org-attach.el
+++ b/lisp/org-attach.el
@@ -159,19 +159,28 @@ (defcustom org-attach-archive-delete nil
 (defun org-attach-id-uuid-folder-format (id)
   "Translate an UUID ID into a folder-path.
 Default format for how Org translates ID properties to a path for
-attachments.  Useful if ID is generated with UUID."
-  (format "%s/%s"
-	  (substring id 0 2)
-	  (substring id 2)))
+attachments.  Useful if ID is generated with UUID.
+
+When ID is too short (less than 3 chars), use its md5 hash to create
+the path."
+  (if (< (length id) 3)
+      (format "--/%s" id)
+    (format "%s/%s"
+	    (substring id 0 2)
+	    (substring id 2))))
 
 (defun org-attach-id-ts-folder-format (id)
   "Translate an ID based on a timestamp to a folder-path.
 Useful way of translation if ID is generated based on ISO8601
 timestamp.  Splits the attachment folder hierarchy into
-year-month, the rest."
-  (format "%s/%s"
-	  (substring id 0 6)
-	  (substring id 6)))
+year-month, the rest.
+
+When ID is too short (less than 7 chars), return \"unknown/ID\"."
+  (if (< (length id) 7)
+      (format "unknown/%s" id)
+    (format "%s/%s"
+	    (substring id 0 6)
+	    (substring id 6))))
 
 (defcustom org-attach-id-to-path-function-list '(org-attach-id-uuid-folder-format
 						 org-attach-id-ts-folder-format)
-- 
2.35.1


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-- 
Ihor Radchenko,
Org mode contributor,
Learn more about Org mode at https://orgmode.org/.
Support Org development at https://liberapay.com/org-mode,
or support my work at https://liberapay.com/yantar92

  reply	other threads:[~2022-08-10 11:44 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-07-20 19:12 [BUG] org-attach-id-ts-folder-format fails on customized IDs [9.6 (9.6-??-2e9999783)] Janek F
2022-07-23  5:22 ` [PATCH] " Ihor Radchenko
2022-08-02 22:26   ` Janek F
2022-08-03 16:03   ` Max Nikulin
2022-08-03 22:25     ` Ihor Radchenko
2022-08-10 11:43       ` Ihor Radchenko [this message]
2022-08-10 12:17         ` [PATCH v2] " Max Nikulin
2022-08-10 13:23           ` [PATCH v3] " Ihor Radchenko
2022-08-10 15:18             ` Max Nikulin
2022-08-11  4:19               ` Ihor Radchenko
2022-08-11 14:43                 ` Max Nikulin
2022-08-13  5:29                   ` Ihor Radchenko
2022-08-13 16:25                     ` Max Nikulin
2022-08-14  4:00                       ` Ihor Radchenko
2022-10-02  9:14                         ` [PATCH v4] " Ihor Radchenko
2022-10-04 15:27                           ` Max Nikulin
2022-10-05  5:44                             ` Ihor Radchenko
2022-11-06  7:43                               ` Ihor Radchenko
2022-11-07 17:05                               ` [PATCH] org-attach.el: ID to path functions may return nil Max Nikulin
2022-11-08  5:08                                 ` Ihor Radchenko
2022-11-09 16:53                                   ` [PATCH v2] " Max Nikulin
2022-11-10  7:19                                     ` Ihor Radchenko
2022-11-13 16:26                                       ` Max Nikulin
2022-11-14  3:29                                         ` Ihor Radchenko
2022-11-14 16:59                                           ` Max Nikulin
2022-11-15  2:41                                             ` Ihor Radchenko
2022-11-15 16:41                                               ` Max Nikulin
2022-11-16  1:54                                                 ` Ihor Radchenko
2022-08-12 15:35 ` [BUG] org-attach-id-ts-folder-format fails on customized IDs [9.6 (9.6-??-2e9999783)] Max Nikulin
2022-08-12 16:08   ` Janek F
2022-08-13  5:17     ` Ihor Radchenko
2022-08-13 15:59     ` Max Nikulin

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