A self-contained Bash script that downloads files directly from Google Drive by bypassing the web confirmation layer, with automatic filename extraction and URL decoding.

google-drive-direct-download.sh

#!/usr/bin/env bash
set -euo pipefail

if [[ $# -lt 1 ]]; then
  echo "Usage: $0 <google-drive-url>"
  exit 1
fi

URL="$1"
TMPDIR="$(mktemp -d)"
trap 'rm -rf "$TMPDIR"' EXIT
COOKIE="$TMPDIR/cookies.txt"
HDR1="$TMPDIR/h1.txt"
BODY1="$TMPDIR/b1.html"
HDR2="$TMPDIR/h2.txt"
BODY2="$TMPDIR/b2.bin"

# Extract Google Drive file ID from URL
extract_id() {
  local u="$1"
  if [[ "$u" =~ /d/([A-Za-z0-9_-]+) ]]; then
    echo "${BASH_REMATCH[1]}"
    return
  elif [[ "$u" =~ id=([A-Za-z0-9_-]+) ]]; then
    echo "${BASH_REMATCH[1]}"
    return
  fi
  echo ""
}
ID="$(extract_id "$URL")"
if [[ -z "$ID" ]]; then
  echo "[-] Could not extract file ID from URL."
  exit 1
fi

BASE="https://drive.google.com/uc?export=download&id=${ID}"
echo "[+] Requesting: $BASE"

# Initial download attempt
curl -sSL -D "$HDR1" -b "$COOKIE" -c "$COOKIE" -o "$BODY1" "$BASE"

# Detect and handle Google Drive confirmation pages (large file or warning)
if grep -q "<html" "$BODY1" || grep -qi "uc-download-link" "$BODY1"; then
  echo "[!] Detected HTML warning page — extracting real download link..."

  # Try to find direct confirmation link in HTML
  CONFIRM_URL=$(grep -oE 'https://[^"]+confirm=[^"]+' "$BODY1" | head -n1 || true)

  # Fallback: parse form-based confirmation if direct link not found
  if [[ -z "$CONFIRM_URL" ]]; then
    FORM_ACTION=$(grep -oP '<form[^>]*action="\K[^"]+' "$BODY1" | head -n1 || true)
    CONFIRM=$(grep -oP 'name="confirm"\s+value="\K[^"]+' "$BODY1" | head -n1 || true)
    if [[ -n "$FORM_ACTION" && -n "$CONFIRM" ]]; then
      CONFIRM_URL="${FORM_ACTION}?confirm=${CONFIRM}&id=${ID}&export=download"
      [[ "$CONFIRM_URL" =~ ^https? ]] || CONFIRM_URL="https://drive.google.com${CONFIRM_URL}"
    fi
  fi

  # Abort if confirmation link extraction fails
  if [[ -z "$CONFIRM_URL" ]]; then
    echo "[-] Could not parse confirmation link."
    exit 1
  fi

  echo "[+] Found download URL, fetching actual file..."
  curl -sSL -L -D "$HDR2" -b "$COOKIE" -c "$COOKIE" -o "$BODY2" "$CONFIRM_URL"
else
  # If no confirmation needed, just reuse the first response
  mv "$BODY1" "$BODY2"
  cp "$HDR1" "$HDR2"
fi

# Extract filename from HTTP headers
FILENAME=$(grep -i 'Content-Disposition:' "$HDR2" |
  sed -E 's/.*filename\*?=([^;]+)/\1/' |
  sed -E "s/(UTF-8'')?['\"]?([^'\"]+)['\"]?/\2/" |
  tr -d '\r' |
  tail -n1)

# Default fallback filename
if [[ -z "$FILENAME" ]]; then
  FILENAME="downloaded_file"
fi

# Decode URL-encoded filename if Python is available
if command -v python3 >/dev/null 2>&1; then
  FILENAME=$(python3 -c "import urllib.parse,sys;print(urllib.parse.unquote(sys.argv[1]))" "$FILENAME")
fi

# Save final output file
mv "$BODY2" "./$FILENAME"
echo "[+] Saved file as: $FILENAME"