Added column type _jwt

Documentation/Report.rst

@@ -712,6 +712,8 @@ Summary:
 +------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
 |_decrypt                |:ref:`column-decrypt` - Decrypt value.                                                                                                                                                       |
 +------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+|_jwt                    |:ref:`column-jwt` - generates a json web token from the provided data.                                                                                                                       |
++------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
 
 
 .. _column-link:
@@ -1802,6 +1804,37 @@ Decrypting selected columns or strings which are encrypted with QFQ.
 
     10.sql = SELECT secret AS _decrypt FROM Person WHERE id = 1
 
+.. _column-jtw:
+
+Column: _jwt
+^^^^^^^^^^^^
+
+Creates a `json web token <https://jwt.io/>`_ from the provided data.
+
+Supported options:
++-----------+---------------+-------+
+| Parameter | Default value | Note  |
++===========+===============+=======+
+| `alg`     | `HS256`       | The signing algorithm - it is included in the header |
+| `key`     | (none)        | The secret key used for signing the token |
++-----------+---------------+-------+
+
+Predefined claims:
+
++-------+---------+---------------+------+
+| Claim | Present | Default value | Note |
++=======+=========+===============+======+
+| `iss` | always  | `qfq`         | The default value might be also specified in QFQ settings |
+| `iat` | always  | current timestamp | Ignores any provided value |
+| `exp` | when specified | none   | Prefix with `+` to specify a relative timestamp |
+| `nbf` | when specified | none   | Prefix with `+` to specify a relative timestamp |
++-------+---------+---------------+------+
+
+**Syntax** ::
+
+    10.sql = SELECT 'exp:+3600,data:{msg:default alg}|secretKey' AS _jwt
+    20.sql = SELECT 'exp:+60,data:{msg:explicit agl}|secretKey|ES384' AS _jwt
+
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