Matt Sicker created LOG4J2-1848:
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Summary: Add JSON encoding support to EncodingPatternConverter
%encode{}.
Key: LOG4J2-1848
URL: https://issues.apache.org/jira/browse/LOG4J2-1848
Project: Log4j 2
Issue Type: New Feature
Components: Layouts
Reporter: Matt Sicker
Assignee: Matt Sicker
The existing implementation of EncodingPatternConverter is for escaping output
for HTML specifically. This pattern converter should be extended to allow
multiple types of encoding. The existing HTML behavior should be the default,
but an optional second parameter should be added to allow specifying a
different format to encode for.
For JSON, encoding would require the following:
{noformat}
The representation of strings is similar to conventions used in the C
family of programming languages. A string begins and ends with
quotation marks. All Unicode characters may be placed within the
quotation marks except for the characters that must be escaped:
quotation mark, reverse solidus, and the control characters (U+0000
through U+001F).
Any character may be escaped. If the character is in the Basic
Multilingual Plane (U+0000 through U+FFFF), then it may be
represented as a six-character sequence: a reverse solidus, followed
by the lowercase letter u, followed by four hexadecimal digits that
encode the character's code point. The hexadecimal letters A though
F can be upper or lowercase. So, for example, a string containing
only a single reverse solidus character may be represented as
"\u005C".
Alternatively, there are two-character sequence escape
representations of some popular characters. So, for example, a
string containing only a single reverse solidus character may be
represented more compactly as "\\".
To escape an extended character that is not in the Basic Multilingual
Plane, the character is represented as a twelve-character sequence,
encoding the UTF-16 surrogate pair. So, for example, a string
containing only the G clef character (U+1D11E) may be represented as
"\uD834\uDD1E".
{noformat}
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