chore: initial GitHub releases action

.github/workflows/release.yml

@@ -0,0 +1,18 @@
+name: Release
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  release:
+    name: "Create Releases"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - name: Release Script
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          ./.github/workflows/scripts/release.sh

.github/workflows/scripts/release.sh

@@ -0,0 +1,172 @@
+#!/bin/bash
+set -e
+set -o pipefail
+
+# Uncomment for testing purposes:
+
+#GITHUB_TOKEN=YOUR_TOKEN_HERE
+#GITHUB_REPOSITORY=invertase/extensions-release-testing
+
+# -------------------
+#      Functions
+# -------------------
+json_escape () {
+  printf '%s' "$1" | python -c 'import json,sys; print(json.dumps(sys.stdin.read()))'
+}
+
+# Creates a new GitHub release
+#   ARGS:
+#     1: Name of the release (becomes the release title on GitHub)
+#     2: Markdown body of the release
+#     3: Release Git tag
+create_github_release(){
+  local response=''
+  local release_name=$1
+  local release_body=$2
+  local release_tag=$3
+
+	local body='{
+	  "tag_name": "%s",
+	  "target_commitish": "master",
+	  "name": "%s",
+	  "body": %s,
+	  "draft": false,
+	  "prerelease": false
+	}'
+
+  # shellcheck disable=SC2059
+  body=$(printf "$body" "$release_tag" "$release_name" "$release_body")
+	response=$(curl --request POST \
+	  --url https://api.github.com/repos/${GITHUB_REPOSITORY}/releases \
+	  --header "Authorization: Bearer $GITHUB_TOKEN" \
+	  --header 'Content-Type: application/json' \
+	  --data "$body" \
+	  -s)
+
+	created=$(echo "$response" | python -c "import sys, json; data = json.load(sys.stdin); print(data.get('id', sys.stdin))")
+	if [ "$created" != "$response" ]; then
+    echo "release created successfully"
+  else
+    echo "release failed to create; "
+    printf "\n%s\n" "$body"
+    printf "\n%s\n" "$response"
+    exit 1;
+  fi
+}
+
+# Updates an existing GitHub release
+#   ARGS:
+#     1: Name of the release (becomes the release title on GitHub)
+#     2: Markdown body of the release
+#     3: Release Git tag
+#     4: ID of the existing release
+update_github_release(){
+  local response=''
+  local release_name=$1
+  local release_body=$2
+  local release_tag=$3
+  local release_id=$4
+
+	local body='{
+	  "tag_name": "%s",
+	  "target_commitish": "master",
+	  "name": "%s",
+	  "body": %s,
+	  "draft": false,
+	  "prerelease": false
+	}'
+
+  # shellcheck disable=SC2059
+  body=$(printf "$body" "$release_tag" "$release_name" "$release_body")
+	response=$(curl --request PATCH \
+	  --url "https://api.github.com/repos/$GITHUB_REPOSITORY/releases/$release_id" \
+	  --header "Authorization: Bearer $GITHUB_TOKEN" \
+	  --header 'Content-Type: application/json' \
+	  --data "$body" \
+	  -s)
+
+	updated=$(echo "$response" | python -c "import sys, json; data = json.load(sys.stdin); print(data.get('id', sys.stdin))")
+	if [ "$updated" != "$response" ]; then
+    echo "release updated successfully"
+  else
+    echo "release failed to update; "
+    printf "\n%s\n" "$body"
+    printf "\n%s\n" "$response"
+    exit 1;
+  fi
+}
+
+# Creates or updates a GitHub release
+#   ARGS:
+#     1: Extension name
+#     2: Extension version
+#     3: Markdown body to use for the release
+create_or_update_github_release() {
+  local response=''
+  local release_id=''
+  local extension_name=$1
+  local extension_version=$2
+  local release_body=$3
+  local release_tag="$extension_name-$extension_version"
+  local release_name="$extension_name $extension_version"
+
+  response=$(curl --request GET \
+    --url "https://api.github.com/repos/${GITHUB_REPOSITORY}/releases/tags/${release_tag}" \
+    --header "Authorization: Bearer $GITHUB_TOKEN" \
+    --header 'Content-Type: application/json' \
+    --data "$body" \
+    -s)
+
+  release_id=$(echo "$response" | python -c "import sys, json; data = json.load(sys.stdin); print(data.get('id', 'Not Found'))")
+  if [ "$release_id" != "Not Found" ]; then
+    echo "Existing release (${release_id}) found for $release_tag - updating it ... "
+    update_github_release "$release_name" "$release_body" "$release_tag" "$release_id"
+  else
+    response_message=$(echo "$response" | python -c "import sys, json; data = json.load(sys.stdin); print(data.get('message', 'OK'))")
+    if [ "$response_message" != "OK" ]; then
+      echo "Failed to create/update release '$release_name' -> GitHub API request failed with response: $response_message"
+      echo "$response"
+      exit 1;
+    else
+      echo "Creating new release '$release_tag' ... "
+      create_github_release "$release_name" "$release_body" "$release_tag"
+    fi
+  fi
+}
+
+# -------------------
+#    Main Script
+# -------------------
+
+# Ensure that the GITHUB_TOKEN env variable is defined
+if [[ -z "$GITHUB_TOKEN" ]]; then
+  echo "Missing required GITHUB_TOKEN env variable. Set this on the workflow action or on your local environment."
+  exit 1
+fi
+
+# Ensure that the GITHUB_REPOSITORY env variable is defined
+if [[ -z "$GITHUB_REPOSITORY" ]]; then
+  echo "Missing required GITHUB_REPOSITORY env variable. Set this on the workflow action or on your local environment."
+  exit 1
+fi
+
+if [[ $(git branch | grep "^*" | awk '{print $2}') != "master" ]]; then
+  # Find all extensions based on whether a extension.yaml file exists in the directory
+  for i in $(find . -type f -name 'extension.yaml' -exec dirname {} \; | sort -u); do
+    # Pluck extension name from directory name
+    extension_name=$(echo "$i" | sed "s/\.\///")
+    # Pluck extension latest version from yaml file
+    extension_version=$(awk '/^version: /' "$i/extension.yaml" | sed "s/version: //")
+    # Pluck out change log contents for the latest extension version
+    changelog_contents=$(awk -v ver="$extension_version" '/^## Version / { if (p) { exit }; if ($3 == ver) { p=1; next} } p && NF' "$i/CHANGELOG.md")
+    # JSON escape the markdown content for the release body
+    changelog_contents=$(json_escape "$changelog_contents")
+    # Creates a new release if it does not exist
+    #   OR
+    # Updates an existing release with updated content (allows updating CHANGELOG.md which will update relevant release body)
+    create_or_update_github_release "$extension_name" "$extension_version" "$changelog_contents"
+  done
+else
+	echo "This action can only run on 'master' branch."
+	exit 0
+fi