Thunderbird 生成的回复中的 URL 被删除

我们团队中有一位使用 Thunderbird 作为邮件客户端的成员发现,当他在回复邮件中向 Discourse 主题发送 URL 时,这些 URL 会被从邮件中移除(即邮件内容会被添加到主题中,但邮件正文中的任何 URL 在 Discourse 网站或针对新邮件生成的邮件通知中查看时都已消失)。

[编辑:空白字符(如换行符)也被移除了,这一点在我发布原始帖子或捕获下方更新的输出结果时并未完全意识到]

以下是 Thunderbird 生成的邮件头中的一些关键行(如果需要我分享其他行,请告诉我):

User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:68.0) Gecko/20100101 Thunderbird/68.12.0
Content-Type: text/plain; charset=utf-8; format=flowed

此类邮件的一个示例如下:

https://github.com/chapel-lang/chapel/pull/16369 will make it only run under valgrind or with the address sanitizer.

Thanks,

Lydia

在 Discourse 上显示为:

will make it only run under valgrind or with the address sanitizer. Thanks, Lydia

其中 URL 消失了,换行符也不见了。

无论 URL 是邮件正文中的第一个非空白内容,还是位于邮件中间,这种行为似乎都是一致的。

通过其他方式发送相同的内容,特别是其他纯文本方式,URL 会被保留:

  • 从 alpine 发送(Content-Type: TEXT/PLAIN; format=flowed; charset=US-ASCII
  • 从 Gmail 使用“纯文本”模式发送(Content-Type: text/plain; charset="UTF-8"
  • 从 OWA 发送(Content-Type: text/html; charset="iso-8859-1"

我们尝试过的调试方法包括:

  • 将带有完整邮件头的 Thunderbird 生成邮件粘贴到 admin/email/advanced 测试工具中,该工具似乎能正确识别邮件正文并保留 URL
  • 提高用户的信任等级
  • 让该用户从同一 Thunderbird 会话向其他外部邮件收件人发送相同消息,以确认 URL 是否被保留

我们需要帮助来确定问题出在哪里,或者我们还能做些什么来进一步调试我们这边的问题。例如,我们(或你们)是否有任何方法可以查看原始接收到的邮件,或者在“高级测试”工具之外调试其处理过程?

非常感谢您的任何帮助,
-Brad

我恰好安装了 Mozilla Thunderbird,并且非常频繁地使用它,所以让我尝试复现这个问题。

实际上,您是否已让团队成员将 Mozilla Thunderbird 更新到最新版本?最新的稳定版(ESR)是 78。这或许会有所帮助。

谢谢,Justin。我会看看他们是否能够更新,不过我们当然也很想知道你是否能够复现这个问题(使用任意版本的 Thunderbird),因为这应该很简单。我看到了你在这里发布的帖子中的 URL,但看起来你是通过网页界面发布的,而不是通过邮件回复?

此外,自从我最初的帖子以来,我们收集了更多数据:

  • 当向某个分类的邮件别名发布新主题时,用户的 URL 会被保留。
  • 当浏览到已发送邮件文件夹并回复他们之前对某个主题的回复时,URL 会被保留。
  • 当回复 Discourse 生成的帖子通知邮件时,URL 会被移除(此外,空白字符也会被移除,这一点我最初并未意识到或未能正确记录;我会编辑原帖以澄清这一点)。

很多情况下都能正常工作,但回复通知邮件时似乎不行。

如果这有助于调试,我很乐意将相关消息提供给 Discourse 开发人员。

您能否发布 Discourse 收到的原始邮件的相关部分?作为管理员,点击 :email: 图标即可查看。

请确保同时包含 HTML 部分和纯文本部分。

感谢 @riking,我之前没发现信封图标是查看原始邮件的方式——这功能太棒了!(没早点注意到,我有点不好意思)

既然你提醒了我,我发现如果把原始文本粘贴到“高级测试”工具中,结果也会以类似的方式被剥离,这令人鼓舞。看来我之前认为 Thunderbird 邮件仅包含纯文本是错误的(我是通过让她直接发送相同的邮件并检查它们得出这个结论的,但可能在这个过程中得出了错误的结论?)。

既然知道了信封图标的用途,我会尝试比较那些保留了 URL 的帖子和回复与那些没有保留的,看看能否找出两者之间的差异。

同时,附上原始邮件,以便你更快地查明问题所在(如果这不是你所指的“HTML 和纯文本部分”,请告诉我):

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https://github.com/chapel-lang/chapel/pull/16369 将使它仅在 valgrind 下运行
或使用地址清理器。

谢谢,
Lydia

于 2020 年 9 月 10 日上午 10:28,Michael Ferguson 通过 Chapel 编程语言 写道:
> [mppf] 	mppf 
> <https://chapel.discourse.group/u/mppf> 
>
> 9 月 10 日
>
> 你好 Lydia-
>
> 在我的系统上,该测试在该 PR 之前和之后都会核心转储。
> 我认为这是一次偶然的通过,
> 该测试需要在 valgrind 下运行以避免这种情况。
>
> -michael
>
> 你好 Michael,
>
> |你的 inout 更改是否合理修复了这个问题?我不确定是否有更好的候选 PR 谢谢,Lydia|
> ------------------------------------------------------------------------
>
> 访问主题 
> <https://chapel.discourse.group/t/cron-fast/485/3> 
> 或回复此邮件以响应。
>
> ------------------------------------------------------------------------
>
>
>         回复内容
>
> [chapelu] 	chapelu 
> <https://chapel.discourse.group/u/chapelu> 
>
> 9 月 10 日
>
> === 摘要 =================================================== 
> 主机名:chapvm12 修订版: 
> https://github.com/chapel-lang/chapel/commit/a07bdf4084 日志文件: 
> /data/sea/chapel/Nightly/day3-Wed-fast.log 开始时间:2020 年 9 月 9 日星期三 02:00:21 
> 结束时间:2020 年 9 月 9 日星期三 23:52:03 运行测试:查看此 …
> ------------------------------------------------------------------------
>
> 访问主题 
> <https://chapel.discourse.group/t/cron-fast/485/3> 
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>
> 您收到此邮件是因为您启用了邮件列表模式。
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    <a class="moz-txt-link-freetext" href="https://github.com/chapel-lang/chapel/pull/16369">https://github.com/chapel-lang/chapel/pull/16369</a> 将使它仅在
    valgrind 下运行或使用地址清理器。<br>
    <br>
    谢谢,<br>
    Lydia<br>
    <br>
    <div class="moz-cite-prefix">于 2020 年 9 月 10 日上午 10:28,Michael Ferguson
      通过 Chapel 编程语言 写道:<br>
    </div>
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                  <span style="text-align:right;color:#999999;padding-right:5px;font-family:'lucida
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            <p style="margin-top:0; border: 0;">你好 Lydia-</p>
            <p style="margin-top:0; border: 0;">在我的系统上,该测试在该 PR 之前和之后都会核心转储。<br>
              我认为这是一次偶然的通过,<br>
              该测试需要在 valgrind 下运行以避免这种情况。</p>
            <p style="margin-top:0; border: 0;">-michael</p>
            <p style="margin-top:0; border: 0;">你好 Michael,</p>
            <pre style="word-wrap: break-word; max-width: 694px;"><code style="display: block; background-color: #f1f1ff; padding: 5px;; background-color: #f1f1ff; padding: 2px 5px;">你的 inout 更改是否合理修复了这个问题?我不确定是否有更好的候选 PR

谢谢,
Lydia</code></pre>
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          <div style="padding-top:5px;">=== 摘要
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            2020 年 9 月 9 日星期三 02:00:21 结束时间:2020 年 9 月 9 日星期三 23:52:03 运行
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有趣的部分是:

    <a class="moz-txt-link-freetext" href="https://github.com/chapel-lang/chapel/pull/16369">https://github.com/chapel-lang/chapel/pull/16369</a> 将使其仅在 Valgrind 或地址消毒器下运行。<br>
    <br>
    谢谢,<br>
    Lydia<br>
    <br>

好的。而且根据在“高级测试”工具中编辑每个版本的邮件信息来判断,显然确实是 HTML 版本被传递到了帖子中(而不是邮件的纯文本版本)。因此,该工具似乎会剥离这封邮件中的所有 HTML(这也解释了为什么换行符消失了),但在 OWA 版本的邮件中却没有这样做,而该版本也是多部分的。我目前正在比较这两封邮件,试图找出原因。

以下是保留链接和空白格式的 OWA 版本邮件,供参考:

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https://github.com/chapel-lang/chapel/pull/16369 will make it only run
under valgrind or with the address sanitizer.


Thanks,
Lydia

(Trying with outlook instead of Thunderbird in case that does anything)
________________________________
From: Michael via Chapel Programming Language <[redacted]@discoursemai=
l.com>
Sent: Thursday, September 10, 2020 10:28 AM
To: Lydia <[redacted]@hpe.com>
Subject: Re: Cron fast

[https://avatars.discourse-cdn.com/v4/letter/m/94ad74/45.png]   mppf<https:=
//chapel.discourse.group/u/mppf>
September 10

Hi Lydia-

On my system, this test core dumps both before and after that PR.
I think that this was a sporadic pass and that
this test needs to run under valgrind in order to avoid that.

-michael

Hi Michael,

Would it make sense for your change to inout to have fixed this future?  I'=
m not sure there's a better candidate PR

Thanks,
Lydia

________________________________

Visit Topic<https://chapel.discourse.group/t/cron-fast/485/3> or reply to t=
his email to respond.

________________________________
In Reply To
[https://sjc2.discourse-cdn.com/free1/user_avatar/chapel.discourse.group/ch=
apelu/45/23_2.png]   chapelu<https://chapel.discourse.group/u/chapelu>
September 10
=3D=3D=3D Summary =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D Hostname: chapvm12 Revision: https://github.com/chape=
l-lang/chapel/commit/a07bdf4084 Logfile: /data/sea/chapel/Nightly/day3-Wed-=
fast.log Started: Wed Sep 9 02:00:21 2020 Ended: Wed Sep 9 23:52:03 2020 Te=
sts run: View this =85
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<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3DWindows-1=
252">
<style type=3D"text/css" style=3D"display:none;"> P {margin-top:0;margin-bo=
ttom:0;} </style>
/head>
<body dir=3D"ltr">
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
<p style=3D"margin-top:0; border: 0"><a href=3D"https://github.com/chapel-l=
ang/chapel/pull/16369" style=3D"font-weight: bold; color: #006699">https://=
github.com/chapel-lang/chapel/pull/16369</a> will make it only run<br>
under valgrind or with the address sanitizer.</p>
<p style=3D"margin-top:0; border: 0"><br>
</p>
<p style=3D"margin-top:0; border: 0">Thanks,<br>
Lydia</p>
</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
(Trying with outlook instead of Thunderbird in case that does anything)<br>
</div>
<div id=3D"appendonsend"></div>
<hr style=3D"display:inline-block;width:98%" tabindex=3D"-1">
<div id=3D"divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif" st=
yle=3D"font-size:11pt" color=3D"#000000"><b>From:</b> Michael Ferguson via =
Chapel Programming Language &lt;[redacted]@discoursemail.com&gt;<br>
<b>Sent:</b> Thursday, September 10, 2020 10:28 AM<br>
<b>To:</b>Lydia &lt;[redacted]@hpe.com&gt;<br>
<b>Subject:</b> Re: Cron fast</font>
<div>&nbsp;</div>
</div>
<div dir=3D"ltr" style=3D"text-align:left">
<div>
<div></div>
<div style=3D"margin-bottom:25px">
<table cellspacing=3D"0" cellpadding=3D"0" border=3D"0">
<tbody>
<tr>
<td style=3D"vertical-align:top; width:55px"><img title=3D"mppf" width=3D"4=
5" height=3D"45" src=3D"https://avatars.discourse-cdn.com/v4/letter/m/94ad7=
4/45.png">
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<td><a href=3D"https://chapel.discourse.group/u/mppf" target=3D"_blank" sty=
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I think that this was a sporadic pass and that<br>
this test needs to run under valgrind in order to avoid that.</p>
<p style=3D"margin-top:0; border:0">-michael</p>
<p style=3D"margin-top:0; border:0">Hi Michael,</p>
<pre style=3D"word-wrap:break-word; max-width:694px"><code style=3D"display=
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Thanks,
Lydia</code></pre>
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哦,有意思。对我来说,只需从 这条消息 中的 <a href> 链接里移除 class="moz-txt-link-freetext",就能把损坏的版本在“高级测试”工具中变为可工作的版本……这令人惊讶吗?

为了让我的上一个问题更精确一点,请问这是 Thunderbird 的 bug 吗?它会在发送的邮件超链接中插入 class="moz-txt-link-freetext。这也是 Discourse 的 bug 吗?即当存在此类标签时,会导致被 <a>...</a> 包裹的 URL 从消息正文中丢失,并且后续的 <br> 标签被忽略?

你好 @Falco@riking — 抱歉打扰你们,但鉴于你们之前曾查看过这个问题:对于我在上一篇文章中提出的关于这是否是 Thunderbird 和/或 Discourse 的 bug 行为的问题,你们有什么看法吗?谢谢。

你好 @BradCray

我在对 Mailman mbox 归档使用 import_mbox.sh 时也遇到了同样的问题。

我将问题定位到了 lib/email/receiver.rb 中的 extract_from_mozilla(doc) 方法,并做了一个简单的修复,已提交至 PR https://github.com/discourse/discourse/pull/13176

extract_from_mozilla 方法会将所有 class 属性以 "moz-" 开头的标签设为隐藏。我的调整排除了 class 属性以 ^moz-txt-link\\b 开头的标签,我认为这涵盖了 Thunderbird 的链接(基于我处理的大型 mbox 文件)。

我还没来得及编写测试用例,因此该 PR 可能不会被接受,但欢迎随时使用(不过请注意,除非该 PR 被合并,否则任何升级都可能会覆盖此修改)。

我仅在导入的 mbox 上进行了测试,但认为它也应适用于新收到的邮件。
遗憾的是,我认为它在重新烘焙(rebake)时不会生效(对我而言确实如此),因此可能很难进行回溯应用。

@BradCray,供你知悉,如果没有测试,PR 将不会被接受,而且我还需要一段时间才能有机会着手处理测试事宜。

感谢尝试修复此问题并更新,@bsoares!如果你暂时无法处理,也许你的 PR 能激励其他已经熟悉 Discourse 测试的人接手测试工作。我有点惊讶这个问题没有引起更多的关注或担忧,因为在我看来,Thunderbird 是一款相当流行的邮件客户端(尽管我本人并不使用它)。

再次感谢,
-Brad

感谢评论 @BradCray。希望我能找到时间——工作方面表示我可以花些时间处理,但可能至少还要等几周。我也很惊讶对此提及不多,正如你所说,Thunderbird 是一款流行的邮件客户端。我们刚刚切换到 Discourse,我一直在尝试导入 Mailman 的 mbox 文件,我的同事几乎立刻就发现了这个问题!诊断花了一些时间,因为 Thunderbird 的邮件本身没有问题,问题出在 lib/email/receiver.rb 中一个过于激进的签名/回复隐藏逻辑上!

@BradCray(以及任何正在寻找此问题修复方案的人),我近期没有时间为这个修复提交包含测试的正式 PR。因此,我为我们的 Discourse 部署准备了一个补丁,只要相关方法不被更改,该补丁应该能持续生效(如果方法被更改,希望届时能得到正式修复)。

请将附件 lib_email_receiver_rb-thunderbird_links.patch 放入,例如 /var/discourse/shared/standalone/patches.txt
lib_email_receiver_rb-thunderbird_links.patch.txt (819 Bytes)
(你可能需要先执行以下命令创建目录):

mkdir -p  /var/discourse/shared/standalone/patches

然后在 containers/app.ymlhooks: after_code 部分(如果有插件,请放在插件之后)添加以下内容:

hooks:
  after_code:
    # 在此处放置插件的 "-exec" 命令
    - exec:
        cd: $home
        cmd:
          - git apply /shared/patches/lib_email_receiver_rb-thunderbird_links.patch.txt

这假设你在 volumes: 部分已将 /var/discourse/shared/standalone 映射到 /shared,请根据你的环境进行调整。

你需要使用 ./launcher rebuild app 重新构建容器,但在重新构建时修复应该会被保留。不过,我不确定通过 Web 管理员触发的更新是否会应用此修复。

(附件扩展名为 .txt 以便能附加到此评论中,你可能希望从文件名和配置中移除它。)

我也遇到了同样的问题。因此,我想尝试使用补丁文件提供的解决方案/变通方法。不幸的是,附件 lib_email_receiver_rb-thunderbird_links.patch 未正确上传。您能重新发送一下吗?也许可以直接作为代码块发送?

您好,我已再次附上该文件(因上传原因添加了 ‘.txt’ 后缀),内容如下:

diff --git a/lib/email/receiver.rb b/lib/email/receiver.rb
index a6da67cbaa..38c8439f38 100644
--- a/lib/email/receiver.rb
+++ b/lib/email/receiver.rb
@@ -480,8 +480,12 @@ module Email
 
     def extract_from_mozilla(doc)
       # Mozilla (Thunderbird ?) 能正确识别签名和转发邮件
-      # 移除它们及其之后的所有内容
-      elided = doc.css("*[class^='moz-'], *[class^='moz-'] ~ *").remove
+      # 移除它们及其之后的所有内容。保留 moz-txt-link- 类,因为它们是链接。
+      elided = doc.css("*[@class]:mozfilter", Class.new {
+        def mozfilter node_set
+          node_set.find_all { |node| node["class"] =~ /^moz-/ and node["class"] !~ /^moz-txt-link\b/ }
+        end
+      }.new).remove
       to_markdown(doc.to_html, elided.to_html)
     end

lib_email_receiver_rb-thunderbird_links.patch.txt (819 字节)

为修复我在前一条帖子中刚发现的拼写错误,请使用此补丁。将该补丁文件保存为 ~/lib_email_receiver_rb-thunderbird_links.patch.txt,然后执行:

mkdir -p /var/discourse/shared/standalone/patches
cp ~/lib_email_receiver_rb-thunderbird_links.patch.txt /var/discourse/shared/standalone/patches/

之后,按上述说明编辑 containers/app.yml

谢谢,效果非常好,除了带别名的链接(例如 这个链接)会被分开……

@Flominator 很高兴它至少部分能工作了!我很想调整 mozfilter 部分,使其不丢弃带有别名的链接。我之前没见过这种情况,也未能找到关于 Thunderbird 链接类的文档。不过它的功能并不复杂,所以可能无法处理!您能否发布或私信我创建该帖子的邮件中的 HTML 源代码,以便我查看?谢谢!

大致如下:

    <p>一些文本,<a moz-do-not-send="true"
        href="https://ro.wikipedia.org/wiki/Crai_Nou,_Timi%C8%99">带别名的链接</a>更多文本</p>