First version

.gitignore

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+*
+
+!.gitignore
+!LICENSE
+!*.sh
+!gpgparams
+!Dockerfile

Dockerfile

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+FROM debian:buster-slim
+LABEL maintainer="Xiaonan Shen <s@sxn.dev>"
+
+EXPOSE 25/tcp
+EXPOSE 143/tcp
+ENV DEB_URL https://protonmail.com/download/protonmail-bridge_1.2.6-1_amd64.deb
+WORKDIR /root
+
+# Copy gpg parameters and .deb installer
+COPY gpgparams /protonmail/
+
+# Install dependencies and protonmail bridge
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends socat pass \
+    && apt-get install -y wget \
+    && wget -O /protonmail/protonmail.deb ${DEB_URL} \
+    && apt-get install -y --no-install-recommends /protonmail/protonmail.deb \
+    && apt-get purge -y wget \
+    && apt-get autoremove -y \
+    && rm -rf /var/lib/apt/lists/* \
+    && rm /protonmail/protonmail.deb
+
+COPY entrypoint.sh /bin/
+RUN chmod +x /bin/entrypoint.sh
+
+ENTRYPOINT ["/bin/entrypoint.sh"]

entrypoint.sh

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+#!/bin/bash
+
+set -e
+
+# Initialize
+if [[ $1 == init ]]; then
+
+    # # Parse parameters
+    # TFP=""  # Default empty two factor passcode
+    # shift  # skip `init`
+    # while [[ $# -gt 0 ]]; do
+    #     key="$1"
+    #     case $key in
+    #         -u|--username)
+    #         USERNAME="$2"
+    #         ;;
+    #         -p|--password)
+    #         PASSWORD="$2"
+    #         ;;
+    #         -t|--twofactor)
+    #         TWOFACTOR="$2"
+    #         ;;
+    #     esac
+    #     shift
+    #     shift
+    # done
+
+    # Initialize pass
+    gpg --generate-key --batch /protonmail/gpgparams
+    pass init pass-key
+
+    # Login
+    protonmail-bridge --cli
+
+else
+
+    # socat will make the conn appear to come from 127.0.0.1
+    # ProtonMail Bridge currently expects that.
+    # It also allows us to bind to the real ports :)
+    socat TCP-LISTEN:25,fork TCP:127.0.0.1:1025 &
+    socat TCP-LISTEN:143,fork TCP:127.0.0.1:1143 &
+
+    # Start protonmail
+    # Fake a terminal, so it does not quit because of EOF...
+    rm -f faketty
+    mkfifo faketty
+    cat faketty | protonmail-bridge --cli
+
+fi

gpgparams

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+%no-protection
+%echo Generating a basic OpenPGP key
+Key-Type: RSA
+Key-Length: 2048
+Name-Real: pass-key
+Expire-Date: 0
+%commit
+%echo done