[__jitsi_meet*] Add support for simultaneous interpretations

By using https://gitlab.com/mfmt/jsi which consists of very small and simple
static files, we enable interpretations by default.

With this commit, any DOMAIN created with __jitsi_meet_domain will serve jsi on
https://DOMAIN/i/ and any ROOM can be used with simultaneous interpretation on
https://DOMAIN/i/ROOM

Sponsored by:   camilion.eu, eXO.cat

type/__jitsi_meet/manifest

@@ -262,3 +262,46 @@ EOF
 	fi
 fi
 # TODO: disable the exporter if it is deployed and then admin changes their mind
+
+#
+# Setup interpreter assets if requested
+# See: https://gitlab.com/mfmt/jsi/
+#
+jsi_updated_on="2022-04-21"
+__link "/usr/share/jitsi-meet/interpreters.html" \
+	--type symbolic \
+	--source "/opt/jsi/static/index.html.sample"
+__directory /opt/jsi --mode 0755
+export require="__directory/opt/jsi"
+__download /opt/jsi/jsi.tar.gz \
+	--url 'https://gitlab.com/mfmt/jsi/-/archive/1d2cceaf615ee61c0bba80e5bddc61c5d1018303/jsi-1d2cceaf615ee61c0bba80e5bddc61c5d1018303.tar.gz' \
+	--sum "sha256:b020141093daa9937507b098f358d0be994834c3e23866a457fc5140415a0c53"
+export require="__download/opt/jsi/jsi.tar.gz"
+__unpack /opt/jsi/jsi.tar.gz \
+	--preserve-archive \
+	--tar-strip 1 \
+	--destination /opt/jsi/static \
+	--onchange "$(cat <<EOF
+# Patch style.css to be served on /i/
+sed -i.tmp -E \
+	-e 's!url[(]/img/welcome-background.png[)]!url(/i/img/welcome-background.png)!' \
+	/opt/jsi/static/style.css
+# Patch jsi.js to be served on /i/
+#   and so it always uses the domain it's served from
+#   and so it uses /i/ROOM for the form
+sed -i.tmp -E \
+	-e 's!substr[(][0-9]+[)]!substr(3)!' \
+	-e 's!config[.]jitsimeet_url!url.host!' \
+	-e 's!(window[.]location[.]href)[[:space:]]*=[[:space:]]*"/"!\1 = "/i/"!' \
+	/opt/jsi/static/jsi.js
+# Patch the sample index.html, so it loads external_api.js from same host
+#   and to easen up on the branding
+#   and to enable browser cache
+sed -i.tmp -E \
+	-e "s!src=[^>]*(/external_api.js).!src='\1'!" \
+	-e "s!<h1>[^<]*</h1>!<h1>Jitsi Meetings with interpreter</h1>!" \
+	-e "s!https://meet.mayfirst.org!/!" \
+	-e "s!(style.css|jsi.js)([^?])!\1?v=${jsi_updated_on:?}\2!" \
+	/opt/jsi/static/index.html.sample
+EOF
+)"

type/__jitsi_meet_domain/files/nginx.sh

@@ -102,6 +102,21 @@ server {
             expires 1y;
         }
     }
+    # Paths for jsi / interpreters
+    location ~ ^/i/(img/[^./]*.png|jsi.js|style.css)$
+    {
+        add_header 'Access-Control-Allow-Origin' '*';
+        alias /opt/jsi/static/\$1;
+
+        # cache all versioned files
+        if (\$arg_v) {
+            expires 1y;
+        }
+    }
+    location ~ ^/i/
+    {
+        try_files /${DOMAIN}-interpreters.html /interpreters.html \$uri;
+    }
 
     # BOSH
     location = /http-bind {

type/__jitsi_meet_domain/man.rst

@@ -11,7 +11,13 @@ DESCRIPTION
 -----------
 This type installs and configures the frontend for Jitsi-Meet.
 
-This supports "multi-domain" installations.
+Additionally to regular Jitsi-Meet, users can load `DOMAIN/i/` and
+`DOMAIN/i/ROOM` for an interpreter-enabled interface; this is done with a
+patched version of Jitsi Simultaneous Interpretation (jsi; see references).
+At least a user with `interpreter` in their name must be present.
+
+
+This type supports "multi-domain" installations.
 
 New in April 2022: rooms are independent for each domain, that is:
 https://jitsi1.example.org/room1 and https://jitsi2.example.org/room1 are
@@ -156,6 +162,7 @@ SEE ALSO
 --------
 - `__jitsi_meet(7)`
 - `__jitsi_meet_user(7)`
+- Jitsi Meet Simultaneous Interpretation: https://gitlab.com/mfmt/jsi
 
 
 AUTHORS