cmd-topic/cache-restream-token at main · rwxrob/cmd-topic · GitHub

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

die() {
	printf 'Error: %s\n' "$*" >&2
	exit 1
}

need() {
	command -v "$1" >/dev/null 2>&1 || die "missing required command: $1"
}

first_cmd() {
	local cmd
	for cmd in "$@"; do
		if command -v "$cmd" >/dev/null 2>&1; then
			printf '%s\n' "$cmd"
			return 0
		fi
	done
	return 1
}

urlencode() {
	jq -rn --arg v "$1" '$v|@uri'
}

urldecode() {
	printf '%b' "${1//%/\\x}" | sed 's/+/ /g'
}

config_dir="${HOME}/.config/restream"
client_secret_file="${config_dir}/client_secret.json"
token_json_file="${RESTREAM_TOKEN_FILE:-${config_dir}/token.json}"
port="${RESTREAM_LOOPBACK_PORT:-53683}"
redirect_uri="http://127.0.0.1:${port}"

need jq
need curl
need nc

[[ -f "$client_secret_file" ]] ||
	die "missing client secret file: $client_secret_file"

client_id="$(jq -r '.client_id // empty' "$client_secret_file")"
client_secret="$(jq -r '.client_secret // empty' "$client_secret_file")"

[[ -n "$client_id" ]] || die "could not read .client_id from $client_secret_file"
[[ -n "$client_secret" ]] || die "could not read .client_secret from $client_secret_file"

mkdir -p "$config_dir"
chmod 700 "$config_dir"

tmpdir=''
trap '[[ -n "$tmpdir" ]] && rm -rf "$tmpdir"' EXIT

save_token_json() {
	local json access_token refresh_token expires_in now expires_at tmp
	json="$1"

	access_token="$(printf '%s\n' "$json" | jq -r '.access_token // empty')"
	refresh_token="$(printf '%s\n' "$json" | jq -r '.refresh_token // empty')"
	expires_in="$(printf '%s\n' "$json" | jq -r '.expires_in // 0')"

	[[ -n "$access_token" ]] || {
		printf '%s\n' "$json" >&2
		die 'did not receive access_token from Restream'
	}

	if [[ -z "$refresh_token" && -f "$token_json_file" ]]; then
		refresh_token="$(
			jq -r '.refresh_token // empty' "$token_json_file" 2>/dev/null || true
		)"
	fi

	now="$(date +%s)"
	expires_at=$((now + expires_in))

	tmp="$(mktemp)"
	jq -n \
		--arg access_token "$access_token" \
		--arg refresh_token "$refresh_token" \
		--argjson expires_at "$expires_at" \
		'{
			access_token: $access_token,
			refresh_token: $refresh_token,
			expires_at: $expires_at
		}' >"$tmp"

	mv "$tmp" "$token_json_file"
	chmod 600 "$token_json_file"
}

refresh_from_existing_token() {
	[[ -f "$token_json_file" ]] || return 1

	local refresh_token token_json
	refresh_token="$(
		jq -r '.refresh_token // empty' "$token_json_file" 2>/dev/null || true
	)"
	[[ -n "$refresh_token" ]] || return 1

	token_json="$(
		curl --silent --show-error --fail \
			-X POST 'https://api.restream.io/oauth/token' \
			--user "$client_id:$client_secret" \
			--data-urlencode 'grant_type=refresh_token' \
			--data-urlencode "refresh_token=$refresh_token"
	)" || return 1

	save_token_json "$token_json"
	return 0
}

authorize_new_refresh_token() {
	local state auth_url open_cmd request_file response_file listener_pid
	local request_line path_qs query code returned_state oauth_error token_json

	state="$(LC_ALL=C tr -dc 'A-Za-z0-9' </dev/urandom | head -c 24 || true)"
	[[ -n "$state" ]] || state="state$$"

	auth_url="https://api.restream.io/login?response_type=code&client_id=$(urlencode "$client_id")&redirect_uri=$(urlencode "$redirect_uri")&state=$(urlencode "$state")"

	open_cmd="$(first_cmd open xdg-open || true)"

	printf 'Open this URL if your browser does not open automatically:\n\n%s\n\n' "$auth_url"

	if [[ -n "$open_cmd" ]]; then
		"$open_cmd" "$auth_url" >/dev/null 2>&1 || true
	fi

	tmpdir="$(mktemp -d)"

	request_file="$tmpdir/request.txt"
	response_file="$tmpdir/response.txt"

	cat >"$response_file" <<'EOF'
HTTP/1.1 200 OK
Content-Type: text/html; charset=utf-8
Connection: close

<!doctype html>
<html>
<head><meta charset="utf-8"><title>You may close this window</title></head>
<body style="font-family: sans-serif; padding: 2rem;">
<h1>Authorization received</h1>
<p>You can close this window and return to the terminal.</p>
</body>
</html>
EOF

	printf 'Waiting for Restream OAuth callback on %s ...\n' "$redirect_uri" >&2

	(
		while :; do
			nc -l 127.0.0.1 "$port" <"$response_file" >"$request_file" && break
		done
	) &
	listener_pid="$!"

	for _ in $(seq 1 300); do
		if [[ -s "$request_file" ]]; then
			break
		fi
		sleep 1
	done

	kill "$listener_pid" >/dev/null 2>&1 || true
	wait "$listener_pid" 2>/dev/null || true

	[[ -s "$request_file" ]] || die "timed out waiting for OAuth callback"

	request_line="$(head -n 1 "$request_file" | tr -d '\r')"
	path_qs="${request_line#GET }"
	path_qs="${path_qs%% HTTP/*}"

	query="${path_qs#*\?}"
	[[ "$query" != "$path_qs" ]] || die "callback did not contain a query string"

	code="$(printf '%s\n' "$query" | tr '&' '\n' | sed -n 's/^code=//p' | head -n1)"
	returned_state="$(printf '%s\n' "$query" | tr '&' '\n' | sed -n 's/^state=//p' | head -n1)"
	oauth_error="$(printf '%s\n' "$query" | tr '&' '\n' | sed -n 's/^error=//p' | head -n1)"

	code="$(urldecode "${code:-}")"
	returned_state="$(urldecode "${returned_state:-}")"
	oauth_error="$(urldecode "${oauth_error:-}")"

	[[ -z "$oauth_error" ]] || die "OAuth error: $oauth_error"
	[[ -n "$code" ]] || die "no authorization code received"
	[[ "$returned_state" == "$state" ]] || die "state mismatch"

	token_json="$(
		curl --silent --show-error --fail \
			-X POST 'https://api.restream.io/oauth/token' \
			--user "$client_id:$client_secret" \
			--data-urlencode 'grant_type=authorization_code' \
			--data-urlencode "redirect_uri=$redirect_uri" \
			--data-urlencode "code=$code"
	)"

	save_token_json "$token_json"
}

if ! refresh_from_existing_token; then
	printf 'No usable refresh token found. Starting browser authorization...\n' >&2
	authorize_new_refresh_token
fi