Add support for CAPA command #20
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I rebased this and changed it a little. Now it only add the #capa method to POP3Command, and the other methods are implemented directly on POP3. |
Add Net::POP3Command#capa, which issues the CAPA command and encodes the
result as a hash of {tag => param for tag, param in each_list_item}.
tags and params are both upcased, to simplify case insensitive matching.
Add Net::POP3#capabilities, which caches the result from `command.capa`.
Add Net::POP3#capable?, which returns whether #capabilities includes
a specific `tag` and `param`.
Add Net::POP3#clear_cached_capabilities, which clears the capabilities
cache.
Add Net::POP3#sasl_capable? and Net::POP3#sasl_mechanisms, which query
support of the "SASL" capabability.
Note that the `STLS` extension modifies the CAPA requirements. When
support is added for `STLS`, the capabilities cache must be reset.
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This adds support for asking a POP server about its capabilities (RFC2449).
command.capa.tagandparam.Note that the
STLSextension modifies the CAPA requirements. If support is added forSTLS, the capabilities cache must be reset.This is needed in order to properly support SASL authentication using the
AUTHcommand (RFC5034).And a basic SASL implementation should be the basis for supporting OAuth2 (whether via the non-standard XOAUTH2 SASL mechanism or the standard OAUTHBEARER SASL mechanism). Therefore,
CAPAis a requirement for proper implementation of OAuth2.