#!/usr/bin/env bash
# 生成并签名一个镜像的发布清单：ci/release-manifest.sh <组件> <镜像仓库> <digest> <tag> <通道> <输出目录>
# 签名私钥从环境变量 RELEASE_SIGNING_KEY（PEM 内容）读取，只写进一个 600 权限的临时文件，用完即删；私钥只放在 CI 密钥里，不进仓库、不上传面板。
# 输出：<输出目录>/manifest.json（扁平 JSON，签名对象是它的原始字节）和 manifest.sig（base64 的 DER ECDSA 签名）。
set -euo pipefail

component="${1:?usage: release-manifest.sh <component> <repository> <digest> <tag> <channel> <outdir>}"
repository="${2:?}"; digest="${3:?}"; tag="${4:?}"; channel="${5:?}"; outdir="${6:?}"
[[ "$component" =~ ^(agent|probe|backend)$ ]] || { echo "unsupported component: $component" >&2; exit 2; }
[[ "$digest" =~ ^sha256:[0-9a-f]{64}$ ]] || { echo "digest must look like sha256:<64 hex>" >&2; exit 2; }
[[ "$repository" =~ ^[a-z0-9./_-]+$ && "$tag" =~ ^[A-Za-z0-9._-]+$ && "$channel" =~ ^[a-z0-9._-]+$ ]] || { echo "unexpected characters in repository, tag or channel" >&2; exit 2; }
[[ -n "${RELEASE_SIGNING_KEY:-}" ]] || { echo "RELEASE_SIGNING_KEY is required" >&2; exit 2; }

root="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
version="$(sed -n 's#.*<Version>\(.*\)</Version>.*#\1#p' "$root/backend/Directory.Build.props" | head -1)"
commit="$(git -C "$root" rev-parse --short=10 HEAD 2>/dev/null || true)"
built_at="$(date -u +%Y-%m-%dT%H:%M:%SZ)"
seq="$(date +%s)"

mkdir -p "$outdir"
printf '{"schema":1,"component":"%s","channel":"%s","image":"%s","digest":"%s","tag":"%s","version":"%s","commit":"%s","built_at":"%s","seq":%s}' \
  "$component" "$channel" "$repository" "$digest" "$tag" "$version" "$commit" "$built_at" "$seq" > "$outdir/manifest.json"

key="$(mktemp)"
trap 'rm -f "$key" "$outdir/manifest.sig.bin"' EXIT
chmod 600 "$key"
printf '%s\n' "$RELEASE_SIGNING_KEY" > "$key"
openssl dgst -sha256 -sign "$key" -out "$outdir/manifest.sig.bin" "$outdir/manifest.json"
base64 -w0 "$outdir/manifest.sig.bin" > "$outdir/manifest.sig" 2>/dev/null || base64 "$outdir/manifest.sig.bin" | tr -d '\n' > "$outdir/manifest.sig"
echo "signed $component $tag ($digest) seq=$seq"