Add update checker

.github/workflows/main.yaml

@@ -4,6 +4,8 @@ on:
   push:
     tags:
     - '*'
+  repository_dispatch:
+    types: update
 
 env:
   DOCKER_TAG: shenxn/protonmail-bridge

.github/workflows/update-check.yaml

@@ -0,0 +1,22 @@
+name: update check
+
+on:
+  push:
+    branches:
+    - update-check
+  schedule:
+  - cron: '0 0 * * *'  # runs everyday at midnight
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@master
+      with:
+        ref: master
+    - name: Check Update
+      run: bash check-update.sh
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        PERSONAL_TOKEN: ${{ secrets.PERSONAL_TOKEN }}

Dockerfile

@@ -1,4 +1,4 @@
-FROM debian:buster-slim
+FROM ubuntu:latest
 LABEL maintainer="Xiaonan Shen <s@sxn.dev>"
 
 EXPOSE 25/tcp

check-update.sh

@@ -0,0 +1,35 @@
+#!/bin/bash
+
+set -ex
+
+source ./releaserc
+
+JSON_CONTENT=$(curl -q https://protonmail.com/download/current_version_linux.json)
+URL=$(echo ${JSON_CONTENT} | sed -n "s/^.*\"DebFile\":\"\([a-z0-9:/._-]*\)\".*$/\1/p")
+CURR_RELEASE=$(echo $URL | sed -n "s/https:\/\/protonmail.com\/download\/protonmail-bridge_\([0-9.-]*\)_amd64.deb/\1/p")
+
+if [[ RELEASE != CURR_RELEASE ]]; then
+    echo "New release found: ${CURR_RELEASE}"
+
+    # bump up to new release
+    sed -i "s/^RELEASE=.*$/RELEASE=${CURR_RELEASE}/" releaserc
+
+    # commit
+    git config --local user.email "actions@github.com"
+    git config --local user.name "Github Action"
+    git add releaserc
+    git commit -m "Release ${CURR_RELEASE}" --author="Xiaonan Shen <s@sxn.dev>"
+    git tag -a ${CURR_RELEASE} -m "Release ${CURR_RELEASE}"
+
+    # push
+    REMOTE_REPO="https://${GITHUB_ACTOR}:${GITHUB_TOKEN}@github.com/${GITHUB_REPOSITORY}.git"
+    git push "${REMOTE_REPO}" master
+    git push "${REMOTE_REPO}" master --tags
+
+    # trigger actions
+    curl -H "Accept: application/vnd.github.everest-preview+json" \
+        -H "Authorization: token ${PERSONAL_TOKEN}" \
+        --request POST \
+        --data '{"event_type": "update"}' \
+        https://api.github.com/repos/${GITHUB_REPOSITORY}/dispatches
+fi