rss2email: Add service for RSS feeds to email

This is a basic implementation on top of the venerable `rss2email`
script, and is intended to be driven by a timer and the
`rss2email-subscribe` service, which manages the subscribed feeds.

config/service/rss2email/Containerfile

@@ -0,0 +1,19 @@
+FROM debian:bullseye-slim
+ARG VERSION=4a088c7efe1c76fa1ebe842adc8e2a796df8f313
+
+RUN apt-get update -y && apt-get install -y --no-install-recommends \
+    ca-certificates git gettext gosu \
+    python3 python3-setuptools python3-feedparser python3-html2text python3-bs4
+
+RUN git clone https://github.com/rss2email/rss2email /tmp/rss2email && \
+    cd /tmp/rss2email && git reset --hard ${VERSION} && \
+    python3 setup.py install && \
+    rm -Rf /tmp/rss2email
+
+RUN addgroup --system --gid 10000 rss2email
+RUN adduser --system --uid 10000 --ingroup rss2email --home /var/lib/rss2email rss2email
+
+COPY container/config /etc/rss2email
+COPY container/run-rss2email /run-rss2email
+
+ENTRYPOINT ["/run-rss2email"]

config/service/rss2email/container/config/rss2email.conf.template

@@ -0,0 +1,16 @@
+[DEFAULT]
+from = ${RSS2EMAIL_FROM}
+to = ${RSS2EMAIL_TO}
+user-agent = rss2email/1.0
+use-publisher-email = True
+date-header = True
+html-mail = True
+post-process = rss2email.post_process.prettify process
+email-protocol = smtp
+smtp-auth = True
+smtp-username = ${RSS2EMAIL_SMTP_USERNAME}
+smtp-password = ${RSS2EMAIL_SMTP_PASSWORD}
+smtp-server = ${RSS2EMAIL_SMTP_HOST}
+smtp-port = ${RSS2EMAIL_SMTP_PORT}
+smtp-ssl = True
+verbose = info

config/service/rss2email/container/run-rss2email

@@ -0,0 +1,16 @@
+#!/bin/sh
+
+# Create configuration file from collected templates.
+mkdir -p /etc/rss2email
+envsubst < /etc/rss2email/rss2email.conf.template > /etc/rss2email/rss2email.conf
+
+if test -n "$(ls -A /etc/rss2email/conf.d)"; then
+    cat /etc/rss2email/conf.d/*.conf >> /etc/rss2email/rss2email.conf
+fi
+
+# Correct permissions for data files.
+mkdir -p /var/lib/rss2email
+chown -R rss2email:rss2email /var/lib/rss2email
+
+# Run entrypoint under specific user.
+gosu rss2email /usr/local/bin/r2e --config /etc/rss2email/rss2email.conf --data /var/lib/rss2email/data.json "$@"

config/service/rss2email/rss2email.env.template

@@ -0,0 +1,9 @@
+# Options for RSS-to-Email.
+RSS2EMAIL_FROM=${RSS2EMAIL_FROM}
+RSS2EMAIL_TO=${RSS2EMAIL_TO}
+
+# Options for SMTP delivery mechanism.
+RSS2EMAIL_SMTP_HOST=${POSTFIX_HOST}
+RSS2EMAIL_SMTP_PORT=587
+RSS2EMAIL_SMTP_USERNAME=${POSTFIX_LOCAL_SMTP_USERNAME}
+RSS2EMAIL_SMTP_PASSWORD=${POSTFIX_LOCAL_SMTP_PASSWORD}

config/service/rss2email/spec.bu

@@ -0,0 +1,12 @@
+variant: fcos
+version: 1.3.0
+storage:
+  trees:
+    - path: /etc/systemd/system
+      local: service/rss2email/systemd/
+systemd:
+  units:
+    - name: rss2email.service
+      enabled: true
+    - name: rss2email.timer
+      enabled: true

config/service/rss2email/systemd/rss2email-subscribe@.service

@@ -0,0 +1,18 @@
+[Unit]
+Description=RSS Feed Subscription for %I
+
+[Service]
+Type=oneshot
+RemainAfterExit=true
+SyslogIdentifier=%N
+ExecStart=/bin/podman run --rm --entrypoint /bin/bash \
+                          --volume rss2email-feeds:/etc/rss2email/conf.d:z \
+                          localhost/rss2email:latest -c \
+                          "printf '[feed.%%s]\nurl = %I\n' $(md5sum <<< '%i' | cut -c-32) > /etc/rss2email/conf.d/%i.conf"
+ExecStop=/bin/podman run --rm --entrypoint /bin/bash \
+                         --volume rss2email-feeds:/etc/rss2email/conf.d:z \
+                         localhost/rss2email:latest -c \
+                         "rm -f /etc/rss2email/conf.d/%i.conf"
+
+[Install]
+WantedBy=multi-user.target

config/service/rss2email/systemd/rss2email.service

@@ -0,0 +1,16 @@
+[Unit]
+Description=RSS Feed to Email
+Wants=container-build@%N.service postfix.service
+After=container-build@%N.service postfix.service
+
+[Service]
+Type=oneshot
+SyslogIdentifier=%N
+ExecStart=/bin/podman run --replace --name %N --net internal \
+                          --env-file %E/coreos-home-server/%N/%N.env \
+                          --volume %N-feeds:/etc/%N/conf.d:z,ro \
+                          --volume %N:/var/lib/%N:z \
+                          localhost/%N:latest run
+
+[Install]
+WantedBy=multi-user.target

config/service/rss2email/systemd/rss2email.timer

@@ -0,0 +1,9 @@
+[Unit]
+Description=RSS-to-Email scheduled conversion
+
+[Timer]
+OnUnitActiveSec=1h
+Persistent=true
+
+[Install]
+WantedBy=timers.target

host/virtual/spec.bu

@@ -18,6 +18,7 @@ ignition:
       - local: service/radicale/spec.ign
       - local: service/discord-ircd/spec.ign
       - local: service/spectrum/spec.ign
+      - local: service/rss2email/spec.ign
 
 passwd:
   users:

host/virtual/virtual.env

@@ -34,3 +34,7 @@ POSTFIX_LOCAL_SMTP_PASSWORD=password
 
 # Configuration for rspamd.
 RSPAMD_CONTROLLER_PASSWORD=password
+
+# Configuration for RSS2Email.
+RSS2EMAIL_FROM=noreply@localhost
+RSS2EMAIL_TO=root@localhost