#!/usr/bin/env sh
set -e

if test "$DISTRIBUTION" = "pro"; then
	echo "Using Pro distribution..."
	RELEASES_URL="https://github.com/goreleaser/goreleaser-pro/releases"
	FILE_BASENAME="goreleaser-pro"
	LATEST="$(curl -sf https://goreleaser.com/static/latest-pro)"
else
	echo "Using the OSS distribution..."
	RELEASES_URL="https://github.com/goreleaser/goreleaser/releases"
	FILE_BASENAME="goreleaser"
	LATEST="$(curl -sf https://goreleaser.com/static/latest)"
fi

test -z "$VERSION" && VERSION="$LATEST"

test -z "$VERSION" && {
	echo "Unable to get goreleaser version." >&2
	exit 1
}

TMP_DIR="$(mktemp -d)"
# shellcheck disable=SC2064 # intentionally expands here
trap "rm -rf \"$TMP_DIR\"" EXIT INT TERM

OS="$(uname -s)"
ARCH="$(uname -m)"
test "$ARCH" = "aarch64" && ARCH="arm64"
TAR_FILE="${FILE_BASENAME}_${OS}_${ARCH}.tar.gz"

(
	cd "$TMP_DIR"
	echo "Downloading GoReleaser $VERSION..."
	curl -sfLO "$RELEASES_URL/download/$VERSION/$TAR_FILE"
	curl -sfLO "$RELEASES_URL/download/$VERSION/checksums.txt"
	echo "Verifying checksums..."
	sha256sum --ignore-missing --quiet --check checksums.txt
	if command -v cosign >/dev/null 2>&1; then
		REF="refs/tags/$VERSION"
		if test "$VERSION" = "nightly"; then
			REF="refs/heads/main"
		fi
		if curl -sfLO "$RELEASES_URL/download/$VERSION/checksums.txt.sigstore.json"; then
			echo "Verifying signatures..."
			cosign verify-blob \
				--certificate-identity-regexp "https://github.com/goreleaser/goreleaser.*/.github/workflows/.*.yml@$REF" \
				--certificate-oidc-issuer 'https://token.actions.githubusercontent.com' \
				--bundle checksums.txt.sigstore.json \
				checksums.txt
		elif curl -sfLO "$RELEASES_URL/download/$VERSION/checksums.txt.sig"; then
			curl -sfLO "$RELEASES_URL/download/$VERSION/checksums.txt.pem"
			echo "Verifying signatures..."
			cosign verify-blob \
				--certificate-identity-regexp "https://github.com/goreleaser/goreleaser.*/.github/workflows/.*.yml@$REF" \
				--certificate-oidc-issuer 'https://token.actions.githubusercontent.com' \
				--cert "checksums.txt.pem" \
				--signature "checksums.txt.sig" \
				checksums.txt
		else
			echo "No signatures to verify."
			exit 1
		fi
	else
		echo "Could not verify signatures, cosign is not installed."
	fi
)

tar -xf "$TMP_DIR/$TAR_FILE" -C "$TMP_DIR"
"$TMP_DIR/goreleaser" "$@"
