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When the mode is "streaming", use Server Sent Events instead of a "plain" endless request

This has the advantage of a clearer, less hacky api, which, for instance, does not require manual parsing of the partial response.

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Cleanup leftover method: its logics were moved to the MessageRelay class

Ensure scripts and internal use information are not rendered together with the content, in particular for dumber HTML renderer

move "-destroy_on_cleanup" towards the end of the parameter list

This change improves protection about ambiguous user input

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improved spelling

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Don't provide the url here, the require proc will takwe it from the connection, if any, and fallback otherwise

Follow-up for https://cvs.openacs.org/changelog/OpenACS?cs=oacs-5-10%3Agustafn%3A20230313120323

- make sure the anonymous users nsv is created when the chat is instantiated

- make sure xo::cc is available when the anonymous identifier is generated

- handle in the Chat package, that the uid may not be a user, but an IP address

- adapt other chat skins to the new anonymous user logics

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Added support for anonymous users in chat class

Previous version of the chat class required a login for participating

in the chat. The new version also supports a mixed mode, with

authenticated and non-authenticated users can participate. For

unauthenticated users, the disambiguation is performed over the peer

IP address, similar to the xotcl-request-monitor. Instead of the raw

IP address, an artificial username is displayed for such users (like

e.g. userXXX).

For unauthenticated users, some differences apply:

- one cannot provide a link to the private page

- unauthenticated users cannot access the user-portrait

of authenticated users.

The GUI changes are only made on chat-skins/chat-classic.js, not on

the other skins.

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Make sure configuration is applied consistently to all of the multiple instances of the chat class (add message, subscription, login...) that are involved in a conversation

This fixes certain options such as login and logout message not being applied correctly

reduce cache hits on nsv "::chat::Chat" and on "::chat::Chat-ID-options"

Fully qualify the parameter command to not conflict with the class having the same name in the ::xo namespace

prefer standard OpenACS API for accessing parameters

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use acs::clusterwide instead of xo::clusterwide

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don't rely on uppercase header field names

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factor out script wrappers

reduce number of locks when NaviServer is used

Prefer api to retrieve csp nonce, as it performs useful existance checks

improve spelling

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prefer "nsf::is object" over ":isobject" or "info commands", since it is faster, more generic and can be used in all contexts

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modernize code: use resolver variables rather than method calls

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reduce XOTcl 1.* idioms

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- modernize code (remove "my")

- prefer fully qualified commands based on IDs

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Prefer connchan message relay implementation (we check whether it is available anyway)

Make chat_id required, as path to the chat.tcl script is now immutable and all the potentially expensive package_id retrieval was only due to defaulting the chat_id. Use cases around already define their chat_id independently

Move chat.tcl into acs-subsite:

although this would depend on xowiki, having in xowiki/www might conflict with legitimate pages named "chat"

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improve spelling

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Fix typo

Access object members directly instead than by method

Add default for avatar_p

Chat Redesign: enable/disable avatar pictures by room, using the new attribute 'avatar_p', instead of by package instance, using the 'ShowAvatar' parameter.

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