rfc-http-validate

This is a simple script to validate HTTP messages (possibly containing Structured Fields) in xml2rfcv3 documents.

HTTP Messages in RFC XML

This script examines all sourcecode and artwork elements; when one has a type of http-message, it checks that the content:

• Optionally, starts with a valid HTTP/1.1 request or status line
• Has one or more HTTP/1.1 header field lines, possibly with line folding (so that long lines can be formatted within the constraints of the RFC format)
• Optionally, has a response body, separated from the header fields with a single empty line

The start line will be checked that the method or status code is reasonable, and that the version identifier HTTP/1.1 is correct. The URL in requests will not be validated, however.

Header fields will be validated for general syntax. Additionally, header field names that are configured with structured type information (see below) will be validated according to that type.

For example,

<sourcecode type="http-message">
Foo: bar; baz
Foo: one,
     two
</sourcecode>

... will be validated as having a single field, foo, with the value bar; baz, one, two.

The body, if present, is currently ignored (i.e., the Content-Length is not checked).

Note that in your XML, there must not be any whitespace at the start of lines, unless they're continuation of previous lines (folding, as seen above).

If an RFC8792 \\ wrapping header is present, lines will be unwrapped first (i.e., before unfolding, as per above). This is useful for long lines with binary content (which cannot contain whitespace); e.g.,

<sourcecode type="http-message">
# NOTE: '\' line wrapping per RFC 8792

Signature: sig1=:K2qGT5srn2OGbOIDzQ6kYT+ruaycnDAAUpKv+ePFfD0RAxn/1BUe\
    Zx/Kdrq32DrfakQ6bPsvB9aqZqognNT6be4olHROIkeV879RrsrObury8L9SCEibe\
    oHyqU/yCjphSmEdd7WD+zrchK57quskKwRefy2iEC5S2uAH0EPyOZKWlvbKmKu5q4\
    CaB8X/I5/+HLZLGvDiezqi6/7p2Gngf5hwZ0lSdy39vyNMaaAT0tKo6nuVw0S1MVg\
    1Q7MpWYZs0soHjttq0uLIA3DIbQfLiIvK6/l0BdWTU7+2uQj7lBkQAsFZHoA96ZZg\
    FquQrXRlmYOh+Hx5D9fJkXcXe5tmAg==:
</sourcecode>

Configuring Structured Type Information for Fields

By default, the types of existing Structured Fields (including those that are compatible with Structured Fields; see Retrofit Structured Fields for HTTP) are known. Type information for other fields can be added on the command line or through a file.

To pass a type on the command line, use the --list, --dictionary or --item arguments as appropriate, followed by the field name. For example:

rfc-http-validate --list Foo --list Bar --item Baz my_draft_.xml

Here, Foo and Bar will be validated as Structured Lists, while Baz will be validated as a Structured Item.

Alternatively, you can collect this information in a JSON file, with the top-level object keys being field names, and their values being list, dict or item as appropriate. Thus, the configuration in the example above could be expressed in a JSON file sf.json as:

{
  "Foo": "list",
  "Bar": "list",
  "Baz": "item"
}

... and passed to the script like this:

rfc-http-validate --map sf.json my_draft.xml

Installation

The script requires Python 3, and can be installed with pip:

pip3 install rfc-http-validate