#!/bin/sh
# catchhook — terminal client for CatchHook (https://catchhook.catchhook.workers.dev)
# install:  curl -s https://catchhook.catchhook.workers.dev/cli -o catchhook && chmod +x catchhook
# usage:
#   ./catchhook new               create a capture bin
#   ./catchhook tail <bin|url>    live-tail captures in your terminal (Ctrl-C stops)
#   ./catchhook relay <bin|url> <target> [--all]
#                                 re-deliver captures to a local server, e.g.
#                                 target http://localhost:3000 — webhooks to
#                                 localhost without a tunnel. --all replays
#                                 history too (default: only new captures).
#   ./catchhook help              this text
# needs only curl + sed. no account required.

ORIGIN="https://catchhook.catchhook.workers.dev"

usage() {
  sed -n '2,13p' "$0" | sed 's/^# \{0,1\}//'
}

case "$1" in
  new)
    curl -sf -H 'Accept: text/plain' "$ORIGIN/new" || { echo "error: could not create bin (rate limit or network)" >&2; exit 1; }
    ;;
  tail)
    arg="$2"
    [ -n "$arg" ] || { echo "usage: catchhook tail <bin-id-or-url>" >&2; exit 1; }
    # accept a bare id, /h/<id>... or /b/<id> URL
    id=$(printf '%s' "$arg" | sed -n 's#.*/[hb]/\([a-z0-9][a-z0-9]*\).*#\1#p')
    [ -n "$id" ] || id="$arg"
    hdr=$(mktemp) || exit 1
    trap 'rm -f "$hdr"' EXIT
    trap 'exit 130' INT TERM
    echo "tailing $ORIGIN/h/$id  (Ctrl-C to stop)"
    last=0
    while :; do
      out=$(curl -sf -D "$hdr" "$ORIGIN/api/bins/$id/tail?after=$last") || {
        echo "error: bin not found or server unreachable" >&2; exit 1; }
      new=$(sed -n 's/^[Xx]-[Cc]atchhook-[Ll]ast: *\([0-9]*\).*/\1/p' "$hdr" | tr -d '\r')
      [ -n "$new" ] && last="$new"
      [ -n "$out" ] && printf '%s\n' "$out"
      sleep 2
    done
    ;;
  relay)
    arg="$2"; target="$3"; mode="$4"
    [ -n "$arg" ] && [ -n "$target" ] || { echo "usage: catchhook relay <bin-id-or-url> <target-url> [--all]" >&2; exit 1; }
    id=$(printf '%s' "$arg" | sed -n 's#.*/[hb]/\([a-z0-9-][a-z0-9-]*\).*#\1#p')
    [ -n "$id" ] || id="$arg"
    target=$(printf '%s' "$target" | sed 's#/$##')
    hdr=$(mktemp) || exit 1
    body=$(mktemp) || exit 1
    cfg=$(mktemp) || exit 1
    trap 'rm -f "$hdr" "$body" "$cfg"' EXIT
    trap 'exit 130' INT TERM
    last=0
    if [ "$mode" != "--all" ]; then
      curl -sf -D "$hdr" "$ORIGIN/api/bins/$id/relay-list?peek=1" >/dev/null || {
        echo "error: bin not found or server unreachable" >&2; exit 1; }
      last=$(sed -n 's/^[Xx]-[Cc]atchhook-[Cc]ur: *\([0-9]*\).*/\1/p' "$hdr" | tr -d '\r')
      [ -n "$last" ] || last=0
    fi
    echo "relaying $ORIGIN/h/$id  ->  $target   (Ctrl-C to stop)"
    TAB=$(printf '\t')
    while :; do
      list=$(curl -sf -D "$hdr" "$ORIGIN/api/bins/$id/relay-list?after=$last") || {
        echo "error: bin not found or server unreachable" >&2; exit 1; }
      new=$(sed -n 's/^[Xx]-[Cc]atchhook-[Ll]ast: *\([0-9]*\).*/\1/p' "$hdr" | tr -d '\r')
      [ -n "$new" ] && last="$new"
      printf '%s\n' "$list" | while IFS="$TAB" read -r rid method pathq trunc; do
        [ -n "$rid" ] || continue
        [ "$trunc" = "1" ] && echo "warning: req $rid body was truncated at 100KB \
-- delivering anyway; an HMAC signature over the full body will NOT verify" >&2
        curl -sf "$ORIGIN/api/bins/$id/req/$rid/body" -o "$body" || continue
        curl -sf "$ORIGIN/api/bins/$id/req/$rid/fwd-headers" \
          | sed 's/\\/\\\\/g; s/"/\\"/g; s/^/header = "/; s/$/"/' > "$cfg"
        case "$method" in
          GET|HEAD)
            code=$(curl -s -o /dev/null -w '%{http_code}' -K "$cfg" -X "$method" "$target$pathq") ;;
          *)
            code=$(curl -s -o /dev/null -w '%{http_code}' -K "$cfg" -X "$method" --data-binary @"$body" "$target$pathq") ;;
        esac
        echo "-> $method $pathq  =>  $code"
      done
      sleep 2
    done
    ;;
  help|--help|-h|'')
    usage
    ;;
  *)
    echo "unknown command: $1" >&2
    usage >&2
    exit 1
    ;;
esac