Assets update action (#110)

This action updates assets files, currently there is only one asset
file, the ClearURLs catalog, but the action can be easily expanded if
more are added ( maybe these issues can benefit from it: #82 #61 #10 #7
), just copy and paste the ClearURLS catalog step and change the
enviroment variables.

Co-authored-by: Ilithy <36798218+Ilithy@users.noreply.github.com>

.github/scripts/file-updater.sh

@@ -0,0 +1,48 @@
+# Retrieve parameters
+fileName=$1
+fileURL=$2
+path=$3
+hashURL=$4
+
+# Temporal folder to work on
+# Needed in case a file is updated in the main folder, and the hash checking fails
+downloadFolder="./.file_updater_action_temporal_folder/"
+mkdir $downloadFolder
+tempPath="$downloadFolder$fileName"
+
+# Store checksum
+curlHashExit=1
+if [ "$path" != "" ]; then
+  checksum=$(curl $hashURL)
+  curlHashExit=$?
+fi
+
+# Avoid download of same file
+oldFileChecksum=$(sha256sum "$path$fileName")
+if [ "$oldFileChecksum" = "$checksum  $path$fileName" ]; then
+  echo "Current file checksum is the same as the new one"
+  exit 1
+fi
+
+# Download file
+curl "$fileURL" -o $tempPath
+curlFileExit=$?
+
+# If both downloads were succesful
+if [[ $curlFileExit -eq 0 && $curlHashExit -eq 0 ]]; then
+  # Checksum of file
+  dlFileChecksum=$(sha256sum $tempPath)
+  # If matches
+  if [ "$dlFileChecksum" = "$checksum  $tempPath" ]; then
+    mv $tempPath "$path$fileName"
+    # No need to check exit code, if mv fails GitHub actions will too
+  else
+    # If not, failure
+    echo "Hash does not match" >&2
+    exit 2
+  fi
+else
+  # If not, failure
+  echo "Downloads failed" >&2
+  exit 3
+fi

.github/workflows/assets-updater.yml

@@ -0,0 +1,60 @@
+# This action updates assets files
+name: Assets updater
+
+on:
+ # weekly
+ schedule:
+   - cron: '0 0 * * Sun'
+    
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  download:
+    runs-on: ubuntu-latest
+
+    env:
+      workingBranch: assets-updater-action
+    steps:
+      - name: Checkout main
+        uses: actions/checkout@v3
+
+      - name: Git config
+        run: |
+          git config user.name 'github-actions[bot]'
+          git config user.email 'github-actions[bot]@users.noreply.github.com'
+
+      - name: Check if branch exists
+        run: |
+          count=($(git ls-remote --heads origin "$workingBranch" | wc))
+          if [[ ${count[0]} -ne 0 ]]; then
+            # Exists
+            git fetch
+            git checkout -b $workingBranch "origin/$workingBranch"
+          else
+            # Does not exist
+            git checkout -b $workingBranch
+            git push --set-upstream origin $workingBranch
+          fi
+
+      - name: ClearURLs catalog
+        continue-on-error: true
+        run: |
+          bash ./.github/scripts/file-updater.sh $fileName $fileURL $filePath $hashURL
+          git add "$filePath$fileName"
+          git commit -m "$message"
+          git push
+          echo "$fileName commited successfully"
+        env:
+          fileName: "data.minify.json"
+          fileURL: "https://rules2.clearurls.xyz/data.min.json"
+          filePath: "./app/src/main/assets/"
+          hashURL: "https://rules2.clearurls.xyz/rules.min.hash"
+          message: "ClearURLs catalog updated"
+
+      - name: Pull request
+        run:
+          gh pr create --title 'Automated assets updater action' --body ''
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}