rewrite flutter-action

setup.sh

@@ -0,0 +1,52 @@
+#!/bin/bash
+
+OS_NAME=$(echo "$OS" | awk '{print tolower($0)}')
+MANIFEST_URL="https://storage.googleapis.com/flutter_infra_release/releases/releases_$OS_NAME.json"
+
+# convert version like 2.5.x to 2.5
+normalize_version() {
+  if [[ $1 == *x ]]; then
+    echo ${1::-2}
+  else
+    echo $1
+  fi
+}
+
+latest_version() {
+  jq --arg channel "$1" '.releases | map(select(.channel==$channel)) | first'
+}
+
+wildcard_version() {
+  jq --arg channel "$1" --arg version "^$2" '.releases | map(select(.channel==$channel) | select(.version | test($version))) | first'
+}
+
+get_version() {
+  if [[ -z $2 ]]; then
+    latest_version $1
+  else
+    wildcard_version $1 $2
+  fi
+}
+
+get_version_manifest() {
+  releases_manifest=$(curl --silent --connect-timeout 15 --retry 5 $MANIFEST_URL)
+  version_manifest=$(echo $releases_manifest | get_version $1 $(normalize_version $2))
+
+  if [[ $version_manifest == null ]]; then
+    # fallback through legacy version format
+    echo $releases_manifest | wildcard_version $1 "v$(normalize_version $2)"
+  else
+    echo $version_manifest
+  fi
+}
+
+CHANNEL="$1"
+VERSION="$2"
+VERSION_MANIFEST=$(get_version_manifest $CHANNEL $VERSION)
+
+echo $OS_NAME
+echo $MANIFEST_URL
+echo $CHANNEL
+echo $VERSION
+echo $VERSION_MANIFEST
+