Start implementing the Prosody example.

example/prosody/Fockerfile

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+base: freebsd-latest
+
+steps:
+  - run:
+      - ASSUME_ALWAYS_YES=yes IGNORE_OSVERSION=yes pkg install prosody nginx gettext
+  - run:
+      - sysrc sshd_enable=NO
+      - sysrc sendmail_enable=NONE
+      - sysrc syslogd_flags="-ss"
+      - sysrc clear_tmp_enable=YES
+      - sysrc prosody_enable=YES
+      - sysrc nginx_enable=YES
+  - run:
+      - fetch https://github.com/jsxc/jsxc/releases/download/v4.1.0/jsxc-4.1.0.tar.gz
+      - tar -zvxf jsxc-4.1.0.tar.gz
+  - copy:
+      - [ files/config.sh,
+          /root/config.sh ]
+      - [ files/nginx.conf,
+          /root/nginx.conf ]
+      - [ files/prosody.cfg.lua,
+          /root/prosody.cfg.lua ]
+      - [ files/index.html,
+          /root/index.html ]
+  - run:
+      - source /root/config.sh
+      - if [ "x${PROSODY_DOMAIN}" == "x" ]; then echo PROSODY_DOMAIN must be set; exit 1; fi
+      - if [ "x${PROSODY_JAIL_IP}" == "x" ]; then echo PROSODY_JAIL_IP must be set; exit 1; fi
+      - if [ "x${PROSODY_WEBAPP_VHOST}" == "x" ]; then echo PROSODY_WEBAPP_VHOST must be set; exit 1; fi
+      - cat /root/nginx.conf | envsubst >/usr/local/etc/nginx/nginx.conf
+      - cat /root/prosody.cfg.lua | envsubst >/usr/local/etc/prosody/prosody.cfg.lua
+      - cat /root/index.html | envsubst >/jsxc/index.html
+      - rm -v /root/nginx.conf /root/prosody.cfg.lua /root/index.html
+  - run:
+      - ASSUME_ALWAYS_YES=yes IGNORE_OSVERSION=yes pkg remove gettext
+      - ASSUME_ALWAYS_YES=yes IGNORE_OSVERSION=yes pkg autoremove

example/prosody/files/config.sh

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+PROSODY_DOMAIN=""
+PROSODY_JAIL_IP=""
+PROSODY_WEBAPP_VHOST=""

example/prosody/files/nginx.conf

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+worker_processes 1;
+
+events {
+  worker_connections   1024;
+}
+
+http {
+  include              mime.types;
+  default_type         application/octet-stream;
+
+  server {
+    listen 80;
+    server_name ${PROSODY_WEBAPP_VHOST};
+
+    location /http-bind {
+      proxy_pass http://127.0.0.1/;
+    }
+
+    location / {
+      root /jsxc;
+
+    }
+  }
+}

example/prosody/files/prosody.cfg.lua

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+-- Prosody Example Configuration File
+--
+-- Information on configuring Prosody can be found on our
+-- website at https://prosody.im/doc/configure
+--
+-- Tip: You can check that the syntax of this file is correct
+-- when you have finished by running this command:
+--     prosodyctl check config
+-- If there are any errors, it will let you know what and where
+-- they are, otherwise it will keep quiet.
+--
+-- The only thing left to do is rename this file to remove the .dist ending, and fill in the
+-- blanks. Good luck, and happy Jabbering!
+
+
+---------- Server-wide settings ----------
+-- Settings in this section apply to the whole server and are the default settings
+-- for any virtual hosts
+
+-- This is a (by default, empty) list of accounts that are admins
+-- for the server. Note that you must create the accounts separately
+-- (see https://prosody.im/doc/creating_accounts for info)
+-- Example: admins = { "user1@example.com", "user2@example.net" }
+admins = { }
+
+-- Enable use of libevent for better performance under high load
+-- For more information see: https://prosody.im/doc/libevent
+--use_libevent = true
+
+-- Prosody will always look in its source directory for modules, but
+-- this option allows you to specify additional locations where Prosody
+-- will look for modules first. For community modules, see https://modules.prosody.im/
+--plugin_paths = {}
+
+-- This is the list of modules Prosody will load on startup.
+-- It looks for mod_modulename.lua in the plugins folder, so make sure that exists too.
+-- Documentation for bundled modules can be found at: https://prosody.im/doc/modules
+modules_enabled = {
+
+	-- Generally required
+		"roster"; -- Allow users to have a roster. Recommended ;)
+		"saslauth"; -- Authentication for clients and servers. Recommended if you want to log in.
+		"tls"; -- Add support for secure TLS on c2s/s2s connections
+		"dialback"; -- s2s dialback support
+		"disco"; -- Service discovery
+
+	-- Not essential, but recommended
+		"carbons"; -- Keep multiple clients in sync
+		"pep"; -- Enables users to publish their avatar, mood, activity, playing music and more
+		"private"; -- Private XML storage (for room bookmarks, etc.)
+		"blocklist"; -- Allow users to block communications with other users
+		"vcard4"; -- User profiles (stored in PEP)
+		"vcard_legacy"; -- Conversion between legacy vCard and PEP Avatar, vcard
+
+	-- Nice to have
+		"version"; -- Replies to server version requests
+		"uptime"; -- Report how long server has been running
+		"time"; -- Let others know the time here on this server
+		"ping"; -- Replies to XMPP pings with pongs
+		"register"; -- Allow users to register on this server using a client and change passwords
+		--"mam"; -- Store messages in an archive and allow users to access it
+		--"csi_simple"; -- Simple Mobile optimizations
+
+	-- Admin interfaces
+		"admin_adhoc"; -- Allows administration via an XMPP client that supports ad-hoc commands
+		--"admin_telnet"; -- Opens telnet console interface on localhost port 5582
+
+	-- HTTP modules
+		--"bosh"; -- Enable BOSH clients, aka "Jabber over HTTP"
+		--"websocket"; -- XMPP over WebSockets
+		--"http_files"; -- Serve static files from a directory over HTTP
+
+	-- Other specific functionality
+		--"limits"; -- Enable bandwidth limiting for XMPP connections
+		--"groups"; -- Shared roster support
+		--"server_contact_info"; -- Publish contact information for this service
+		--"announce"; -- Send announcement to all online users
+		--"welcome"; -- Welcome users who register accounts
+		--"watchregistrations"; -- Alert admins of registrations
+		--"motd"; -- Send a message to users when they log in
+		--"legacyauth"; -- Legacy authentication. Only used by some old clients and bots.
+		--"proxy65"; -- Enables a file transfer proxy service which clients behind NAT can use
+}
+
+-- These modules are auto-loaded, but should you want
+-- to disable them then uncomment them here:
+modules_disabled = {
+	-- "offline"; -- Store offline messages
+	-- "c2s"; -- Handle client connections
+	-- "s2s"; -- Handle server-to-server connections
+	-- "posix"; -- POSIX functionality, sends server to background, enables syslog, etc.
+}
+
+-- Disable account creation by default, for security
+-- For more information see https://prosody.im/doc/creating_accounts
+allow_registration = false
+
+-- Force clients to use encrypted connections? This option will
+-- prevent clients from authenticating unless they are using encryption.
+
+c2s_require_encryption = true
+
+-- Force servers to use encrypted connections? This option will
+-- prevent servers from authenticating unless they are using encryption.
+
+s2s_require_encryption = true
+
+-- Force certificate authentication for server-to-server connections?
+
+s2s_secure_auth = false
+
+-- Some servers have invalid or self-signed certificates. You can list
+-- remote domains here that will not be required to authenticate using
+-- certificates. They will be authenticated using DNS instead, even
+-- when s2s_secure_auth is enabled.
+
+--s2s_insecure_domains = { "insecure.example" }
+
+-- Even if you disable s2s_secure_auth, you can still require valid
+-- certificates for some domains by specifying a list here.
+
+--s2s_secure_domains = { "jabber.org" }
+
+-- Select the authentication backend to use. The 'internal' providers
+-- use Prosody's configured data storage to store the authentication data.
+
+authentication = "internal_hashed"
+
+-- Select the storage backend to use. By default Prosody uses flat files
+-- in its configured data directory, but it also supports more backends
+-- through modules. An "sql" backend is included by default, but requires
+-- additional dependencies. See https://prosody.im/doc/storage for more info.
+
+--storage = "sql" -- Default is "internal"
+
+-- For the "sql" backend, you can uncomment *one* of the below to configure:
+--sql = { driver = "SQLite3", database = "prosody.sqlite" } -- Default. 'database' is the filename.
+--sql = { driver = "MySQL", database = "prosody", username = "prosody", password = "secret", host = "localhost" }
+--sql = { driver = "PostgreSQL", database = "prosody", username = "prosody", password = "secret", host = "localhost" }
+
+
+-- Archiving configuration
+-- If mod_mam is enabled, Prosody will store a copy of every message. This
+-- is used to synchronize conversations between multiple clients, even if
+-- they are offline. This setting controls how long Prosody will keep
+-- messages in the archive before removing them.
+
+archive_expires_after = "1w" -- Remove archived messages after 1 week
+
+-- You can also configure messages to be stored in-memory only. For more
+-- archiving options, see https://prosody.im/doc/modules/mod_mam
+
+-- Logging configuration
+-- For advanced logging see https://prosody.im/doc/logging
+log = {
+	info = "prosody.log"; -- Change 'info' to 'debug' for verbose logging
+	error = "prosody.err";
+	-- "*syslog"; -- Uncomment this for logging to syslog
+	-- "*console"; -- Log to the console, useful for debugging with daemonize=false
+}
+
+-- Uncomment to enable statistics
+-- For more info see https://prosody.im/doc/statistics
+-- statistics = "internal"
+
+-- Certificates
+-- Every virtual host and component needs a certificate so that clients and
+-- servers can securely verify its identity. Prosody will automatically load
+-- certificates/keys from the directory specified here.
+-- For more information, including how to use 'prosodyctl' to auto-import certificates
+-- (from e.g. Let's Encrypt) see https://prosody.im/doc/certificates
+
+-- Location of directory to find certificates in (relative to main config file):
+certificates = "certs"
+
+-- HTTPS currently only supports a single certificate, specify it here:
+--https_certificate = "/usr/local/etc/prosody/certs/localhost.crt"
+
+----------- Virtual hosts -----------
+-- You need to add a VirtualHost entry for each domain you wish Prosody to serve.
+-- Settings under each VirtualHost entry apply *only* to that host.
+
+VirtualHost "${PROSODY_DOMAIN}"
+
+--VirtualHost "example.com"
+--	certificate = "/path/to/example.crt"
+
+------ Components ------
+-- You can specify components to add hosts that provide special services,
+-- like multi-user conferences, and transports.
+-- For more information on components, see https://prosody.im/doc/components
+
+---Set up a MUC (multi-user chat) room server on conference.example.com:
+--Component "conference.example.com" "muc"
+--- Store MUC messages in an archive and allow users to access it
+--modules_enabled = { "muc_mam" }
+
+---Set up an external component (default component port is 5347)
+--
+-- External components allow adding various services, such as gateways/
+-- transports to other networks like ICQ, MSN and Yahoo. For more info
+-- see: https://prosody.im/doc/components#adding_an_external_component
+--
+--Component "gateway.example.com"
+--	component_secret = "password"
+
+
+interfaces = { '${PROSODY_JAIL_IP}' }

example/prosody/focker-compose.yml

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+images:
+  prosody: .
+
+jails:
+  prosody:
+    image: prosody
+    ip4.addr: 127.0.14.1