Initial structural mockup

.gitignore

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+magiskmodule/module.prop
+magiskmodule/system
+magiskmodule/README.md
+hosts
+*.zip

.vscode/settings.json

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+{
+  // editor and files config
+  "editor.tabSize": 2,
+  "editor.insertSpaces": true,
+  "editor.formatOnSave": true,
+  "editor.wordWrap": "off",
+  "editor.detectIndentation": false,
+  "editor.trimAutoWhitespace": true,
+  "editor.autoIndent": "full",
+  "editor.renderWhitespace": "trailing",
+  "files.insertFinalNewline": true,
+  "files.trimFinalNewlines": true,
+  "files.trimTrailingWhitespace": true
+}

README.md

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+# MagicalProtection
+Magisk-only completely systemless adblocking

compile.sh

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+#!/bin/bash
+set -e
+set -u
+set -o pipefail
+IFS=$'\n'
+renice -n 19 $$ &>/dev/null
+cd "$(dirname "$(readlink -f "$0")")"
+
+[ -n "$(git status --porcelain)" ] && CHANGES="+" || CHANGES="-"
+VERSIONCODE=$(git rev-list --count HEAD)
+COMMITHASH=$(git log -1 --pretty=%h)
+VERSION=v$VERSIONCODE$CHANGES\($COMMITHASH\)
+FILENAME=MagicalProtection-$VERSION
+
+declare -x VERSION VERSIONCODE
+envsubst < module.prop > magiskmodule/module.prop
+
+cp -f README.md magiskmodule/README.md
+
+./update.sh checkOutHosts
+
+mkdir -p magiskmodule/system/etc
+cat hosts/* \
+| grep -v '^\s*#' \
+| sed -e '/^$/d' \
+| sort \
+| uniq \
+> magiskmodule/system/etc/hosts
+
+./update.sh removeHosts
+
+(
+  cd magiskmodule
+  zip -r -9 -q ../"$FILENAME" .
+)

lists.txt

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+# adblocking hosts lists
+# format: name,url
+StevenBlack_hosts_unified,https://raw.githubusercontent.com/StevenBlack/hosts/master/hosts

magiskmodule/META-INF/com/google/android/update-binary

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+#!/sbin/sh
+
+#################
+# Initialization
+#################
+
+umask 022
+
+# echo before loading util_functions
+ui_print() { echo "$1"; }
+
+require_new_magisk() {
+  ui_print "*******************************"
+  ui_print " Please install Magisk v20.4+! "
+  ui_print "*******************************"
+  exit 1
+}
+
+#########################
+# Load util_functions.sh
+#########################
+
+OUTFD=$2
+ZIPFILE=$3
+
+mount /data 2>/dev/null
+
+[ -f /data/adb/magisk/util_functions.sh ] || require_new_magisk
+. /data/adb/magisk/util_functions.sh
+[ $MAGISK_VER_CODE -lt 20400 ] && require_new_magisk
+
+install_module
+exit 0

magiskmodule/META-INF/com/google/android/updater-script

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+#MAGISK

module.prop

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+id=MagicalProtection
+name=MagicalProtection
+version=$VERSION
+versionCode=$VERSIONCODE
+author=programminghoch10
+description=Magisk-only completely systemless adblocking.
+updateJson=https://raw.githubusercontent.com/programminghoch10/MagicalProtection/deploy/update.json

update.sh

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+#!/bin/bash
+set -e -u
+IFS=$'\n'
+
+function checkOutHosts() {
+  ! git branch | grep -q hosts && git fetch origin hosts:hosts
+  [ -d hosts ] && rm -rf hosts
+  mkdir hosts
+  git clone $(pwd) hosts
+  cd hosts
+  git fetch origin hosts:hosts
+  git checkout hosts
+  cd ..
+}
+
+function removeHosts() {
+  rm -rf hosts
+}
+
+case "${1-}" in
+  checkOutHosts)
+    checkOutHosts
+    exit
+    ;;
+  removeHosts)
+    removeHosts
+    exit
+    ;;
+esac
+
+$0 checkOutHosts
+
+while read -r line; do
+  grep -q '^\s*#' <<< "$line" && continue
+  file=$(cut -d',' -f1 <<< "$line")
+  url=$(cut -d',' -f2 <<< "$line")
+  wget -O hosts/"$file" "$url"
+done < lists.txt
+(
+  cd hosts
+  git add .
+  git commit -m "Update lists"
+  git push
+)
+
+$0 removeHosts