#!/usr/bin/env bash
# link-sanitizer — Purges surveillance tracking tokens & parasitic telemetry from URLs
# Part of the Techné zero-bloat toolkit for the small-web & dissident networks.
# CC0 1.0 Universal / Public Domain. Author: --kof

set -euo pipefail

clean_url() {
    local raw_url="$1"

    # Strip invisible zero-width spaces (ZWSP, ZWNJ, ZWJ, BOM) & non-breaking spaces
    local url
    url=$(printf "%s" "$raw_url" | sed 's/\xc2\xa0/ /g; s/\xe2\x80\x8b//g; s/\xe2\x80\x8c//g; s/\xe2\x80\x8d//g; s/\xef\xbb\xbf//g; s/^[[:space:]]*//; s/[[:space:]]*$//')

    if [[ -z "$url" ]]; then
        return
    fi

    # Python one-liner to parse query parameters and strip tracking tokens
    python3 -c "
import sys
from urllib.parse import urlparse, parse_qsl, urlencode, urlunparse

TRACKING_KEYS = {
    # UTM & Campaign parameters
    'utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content', 'utm_id',
    # Meta / Facebook / Instagram
    'fbclid', 'fref', 'igshid',
    # Google / Alphabet
    'gclid', 'gclsrc', 'dclid', 'gbraid', 'wbraid',
    # YouTube tracking
    'si', 'feature', 'pp',
    # Twitter / X
    'ref_src', 'ref_url',
    # Newsletters / CRM
    'mc_cid', 'mc_eid', 'vero_id', 'vero_conv', 'wickedid',
    # TikTok & Bytedance
    '_r', '_t', 'share_app_name',
    # Misc telemetry & affiliate bloat
    'msclkid', 'yclid', 'rb_clickid', 's_kwcid', '_openstat', 'action_object_map',
    'action_type_map', 'action_ref_map'
}

for line in sys.stdin:
    raw = line.strip()
    if not raw:
        continue
    # If raw doesn't have scheme but looks like url, handle gracefully
    parsed = urlparse(raw)
    if not parsed.netloc and not raw.startswith('http'):
        print(raw)
        continue

    # Filter query parameters
    query_pairs = parse_qsl(parsed.query, keep_blank_values=True)
    filtered = [(k, v) for k, v in query_pairs if k.lower() not in TRACKING_KEYS]

    # Clean query string
    new_query = urlencode(filtered)
    cleaned = urlunparse((
        parsed.scheme,
        parsed.netloc,
        parsed.path,
        parsed.params,
        new_query,
        parsed.fragment
    ))
    # Strip trailing ? if query is now empty
    if cleaned.endswith('?'):
        cleaned = cleaned[:-1]
    print(cleaned)
" <<< "$url"
}

if [[ "${1:-}" == "-c" || "${1:-}" == "--clipboard" ]]; then
    if command -v xclip >/dev/null 2>&1; then
        clip=$(xclip -selection clipboard -o 2>/dev/null || true)
        if [[ -n "$clip" ]]; then
            cleaned=$(clean_url "$clip")
            printf "%s" "$cleaned" | xclip -selection clipboard -i
            printf "Sanitized clipboard: %s\n" "$cleaned"
        fi
    else
        echo "Error: xclip not found" >&2
        exit 1
    fi
elif [[ $# -gt 0 ]]; then
    for arg in "$@"; do
        clean_url "$arg"
    done
else
    # Process from stdin line by line
    while IFS= read -r line || [[ -n "$line" ]]; do
        clean_url "$line"
    done
fi