From: duerst@...
Date: 2016-03-24T09:42:01+00:00
Subject: [ruby-core:74531] [Ruby trunk Bug#12212] Parsing a URI of "mailto:?subject=hi" with `URI.parse` raises an exception

Issue #12212 has been updated by Martin D��rst.


Mark Dodwell wrote:
> Parsing a URI of "mailto:?subject=hi" with `URI.parse` raises an exception. I believe this is a valid "mailto" URI, as defined in RFC6068.

As one of the co-authors of RFC 6068, I have to agree with you. See the first syntax production in https://tools.ietf.org/html/rfc6068#section-2, where the square brackets around 'to' in
 mailtoURI    = "mailto:" [ to ] [ hfields ]
indicate that the 'to' part can be omitted. This rule is exactly the same as in RFC 2368
(see https://tools.ietf.org/html/rfc2368#section-2), the predecessor of RFC 6068.

Although most 'mailto' URIs will have a 'to' part, it can clearly be useful to have a 'mailto' URI without a 'to' part, e.g. if only cc: and bcc: addressees are present, or for some sample emails where e.g. 'subject' and body are prepared, but each user has to enter the addressees themselves.

----------------------------------------
Bug #12212: Parsing a URI of "mailto:?subject=hi" with `URI.parse` raises an exception
https://bugs.ruby-lang.org/issues/12212#change-57655

* Author: Mark Dodwell
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: trunk
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
----------------------------------------
Parsing a URI of "mailto:?subject=hi" with `URI.parse` raises an exception. I believe this is a valid "mailto" URI, as defined in RFC6068.

Behavior observed:

```ruby
>> URI.parse("mailto:?subject=hi")
NoMethodError: undefined method `split' for nil:NilClass
```

Behavior expected:

```ruby
>> uri = URI.parse("mailto:?subject=hi")
=> #<URI::MailTo URL:mailto:?subject=hi>
>> uri.to
=> ""
>> uri.headers
=> [["subject", "hi"]]
```

Reference from RFC6068 than defines the "to" element as optional:

> mailtoURI = "mailto:" [ to ] [ hfields ]
>
> https://tools.ietf.org/html/rfc6068#section-2

Patch attached.

---Files--------------------------------
fix-uri-mailto-parsing-blank-to-with-query.patch (1.52 KB)


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