Download chrome extensions from Chrome Web Store

download_orig_crx.sh

#!/usr/bin/env bash
#
# Download multiple Chrome extensions from the webstore using a CSV file of extension IDs.
#
# Author: Hridoy Sankar Dutta (modified)
set -e

# ==========================================================================
usage() {
  echo "Usage: $0 [-h|--help] <extensionIdsFile> [outputDir] [extensionVersion]"
  echo
  echo "Download multiple Chrome extensions (.crx) from a file with extension IDs."
  echo
  echo "Options:"
  echo "  -h, --help             Show this help message and exit"
  echo
  echo "Arguments:"
  echo "  extensionIdsFile       File containing Chrome extension IDs (one per line)"
  echo "  outputDir              (Optional) Directory to save the .crx files (default: ./original_crx)"
  echo "  extensionVersion       (Optional) Specific version to download"
}

# Check arguments
if [ $# -lt 1 ]; then
  usage
  exit 1
fi

if [ "$1" = "-h" ] || [ "$1" = "--help" ]; then
  usage
  exit 0
fi

extensionIdsFile="$1"
outputPath="${2:-original_crx}"
extensionVersion="$3"

if [ ! -f "$extensionIdsFile" ]; then
  echo "Error: Extension IDs file not found: $extensionIdsFile"
  exit 1
fi

# Create output directory if it doesn't exist
mkdir -p "$outputPath"

# Use a default or hardcoded version of Chrome if google-chrome not found
if command -v google-chrome &> /dev/null; then
  CHROME_VERSION=$(google-chrome --version | cut -d ' ' -f 3)
else
  echo "Warning: google-chrome not found, using hardcoded version."
  CHROME_VERSION="123.0.6312.86"
fi

# Detect OS
[ -n "$platformOs" ] || case "$OSTYPE" in
  *darwin*) platformOs="mac" ;;
  *linux*) platformOs="linux" ;;
  *) echo "Unsupported platform: $OSTYPE"; exit 1 ;;
esac

# Detect architecture
arch="x86-64"
ARCH="$(uname -m)"
case "$ARCH" in
  *arm*) arch="arm" ;;
  "x86_64") arch="x86-64" ;;
esac

# Function to download a single extension
download_extension() {
  local extensionId="$1"
  
  echo "Downloading extension: $extensionId"
  
  # Construct download URL
  crxDownloadUrl='https://clients2.google.com/service/update2/crx?response=redirect'
  crxDownloadUrl="${crxDownloadUrl}&os=${platformOs}"
  crxDownloadUrl="${crxDownloadUrl}&arch=${arch}"
  crxDownloadUrl="${crxDownloadUrl}&os_arch=${arch}"
  crxDownloadUrl="${crxDownloadUrl}&prod=chromecrx"
  crxDownloadUrl="${crxDownloadUrl}&prodchannel=unknown"
  crxDownloadUrl="${crxDownloadUrl}&prodversion=${CHROME_VERSION}"
  crxDownloadUrl="${crxDownloadUrl}&acceptformat=crx3"
  
  # Add version string if provided
  if [ -n "$extensionVersion" ]; then
    crxDownloadUrl="${crxDownloadUrl}&x=id%3D${extensionId}%26uc%26v%3D${extensionVersion}"
  else
    crxDownloadUrl="${crxDownloadUrl}&x=id%3D${extensionId}%26uc"
  fi
  
  # Prepare output
  downloadFilePath="$outputPath/$extensionId.crx"
  
  # Download the CRX - continue on error
  if ! wget \
    --quiet \
    --referer="https://chrome.google.com/webstore/detail/${extensionId}?hl=en" \
    --user-agent="Mozilla/5.0 Chrome/$CHROME_VERSION" \
    -O "$downloadFilePath" "$crxDownloadUrl" 2>/dev/null; then
    echo "⚠️ Warning: Could not download extension $extensionId"
    return 1
  fi
  
  if [ ! -s "$downloadFilePath" ]; then
    echo "❌ Error: Downloaded file for $extensionId has 0 bytes."
    return 1
  else
    echo "✅ Extension $extensionId downloaded to: $downloadFilePath"
    return 0
  fi
}

# Print info header
echo "=== Chrome Extension Downloader ==="
echo "Output directory: $outputPath"
echo "Chrome version: $CHROME_VERSION"
echo "Platform: $platformOs ($arch)"
echo "==============================="

# Read the CSV file line by line and download each extension
total_extensions=$(wc -l < "$extensionIdsFile")
success_count=0
fail_count=0
current=0

while IFS= read -r extensionId || [ -n "$extensionId" ]; do
  # Skip empty lines
  if [ -z "$extensionId" ]; then
    continue
  fi
  
  # Remove any whitespace or carriage returns
  extensionId=$(echo "$extensionId" | tr -d '[:space:]')
  
  # Only process if we have a valid extension ID
  if [ ${#extensionId} -eq 32 ]; then
    current=$((current + 1))
    echo "[$current/$total_extensions] Processing extension ID: $extensionId"
    
    if download_extension "$extensionId"; then
      success_count=$((success_count + 1))
    else
      fail_count=$((fail_count + 1))
      echo "⏩ Skipping and continuing to next extension..."
    fi
  else
    echo "Warning: Skipping invalid extension ID: $extensionId (not 32 characters)"
    fail_count=$((fail_count + 1))
  fi
done < "$extensionIdsFile"

echo "==============================="
echo "Download summary:"
echo "Total extensions processed: $total_extensions"
echo "Successful downloads: $success_count"
echo "Failed downloads: $fail_count"