SKE Backend Plugin

Overview

@syntasso/plugin-ske-backend is a Backstage backend plugin that gives Templates and other Backstage backend code a way to create, read, update, and delete Kratix resources.

It ships two kinds of capability:

Scaffolder actions — steps you can add to a Backstage Template to configure a Kratix resource, write a manifest to the scaffolder workspace, or publish a catalog entity.
HTTP endpoints — a small REST API, used by the ske-frontend plugin, for reading and deleting a resource by its Kubernetes coordinates.

The plugin can talk to your platform in one of three modes, set via ske.mode in app-config.yaml:

kubernetes (default) — reads and writes via the Kubernetes API
gitops — reads and writes via git
hybrid — reads via the Kubernetes API, writes via git

See Configuring the Plugins for full installation and configuration instructions.

Actions

Action	What it does
`ske:configure-resource`	Creates or updates a Kratix resource from an input manifest, via the Kubernetes API or git depending on `ske.mode`
`ske:write-manifest`	Writes a manifest to the scaffolder workspace, for use by later steps in the same Template
`ske:publish-catalog`	Publishes a catalog entity file from the workspace to the catalog git repository

`ske:configure-resource`

Creates or updates a Resource Request — an instance of a Promise's CRD (e.g. a Jenkins resource from a Jenkins Promise) — by submitting the input manifest to the platform. This is the action a Template uses to actually request a Promise on behalf of the user filling in the Template's form.

Input

Field	Type	Description
`manifest`	`string`	The Resource Request manifest, i.e. an instance of the CRD defined by the target Promise's API

Output

Field	Type	Description
`commitsha`	`string` (optional)	Commit SHA of the pushed manifest, when running in `gitops` or `hybrid` mode
`resourceId`	`string` (optional)	Resource ID of the Kubernetes object, when running in `kubernetes` mode

steps:
  - id: ske-configure-resource
    name: Configure a Kratix Resource
    action: ske:configure-resource
    input:
      manifest: |
        apiVersion: marketplace.kratix.io/v1alpha1
        kind: Jenkins
        metadata:
          name: my-jenkins
          namespace: default
        spec:
          plugins:
            - name: git
              version: 1.0.0

`ske:write-manifest`

Writes a file to the scaffolder workspace — the temporary working directory Backstage creates for the duration of a single Template run. Every step in that run reads and writes to the same workspace; it's discarded once the run finishes unless a later step ships its contents somewhere durable (git, the catalog, etc). This action is typically used to stage a Resource Request manifest, or a Backstage catalog entity file, so a later step (e.g. ske:publish-catalog, or a git-publish action) can commit it.

Input

Field	Type	Description
`manifest`	`string`	The file contents to write — a Resource Request manifest, a Backstage catalog entity file, or any other text the Template needs to stage
`targetPath`	`string`	Relative path within the scaffolder workspace to write the file to, e.g. `manifests/my-resource.yaml`. Intermediate directories are created automatically

Output

Field	Type	Description
`manifestPath`	`string`	Absolute path of the written file, on disk, inside the workspace

`ske:publish-catalog`

Publishes a Backstage catalog entity file — a YAML file in Backstage's own format (apiVersion: backstage.io/v1alpha1, kind: Component/API/etc.) that registers something in Backstage's software catalog — from the scaffolder workspace to the git repository backing that catalog. This is a Backstage concept, distinct from a Kratix Resource Request: it's what makes a Resource Request's corresponding Component show up in the Backstage UI.

The typical flow is: ske:write-manifest stages a catalog entity file in the workspace, then ske:publish-catalog commits it to the catalog repo, where Backstage's catalog processor picks it up.

Input

Field	Type	Description
`filePath`	`string`	Path, within the scaffolder workspace, of the catalog entity file to publish (e.g. what `ske:write-manifest` just wrote)
`targetPath`	`string`	Full path within the catalog git repository (from repo root) to write the file to
`repoUrl`	`string`	HTTPS URL of the catalog git repository
`branchName`	`string`	Branch to commit to
`type`	`string`	Git provider type. Currently only `github` is supported
`token`	`string` (optional)	Personal access token for the git repository. If omitted, the GitHub App configured in Backstage is used as a fallback
`username`	`string` (optional)	Git username for basic auth. Inferred from `type` if omitted
`commitMessage`	`string` (optional)	Defaults to `chore: publish catalog entity at <targetPath>`
`defaultAuthor`	`object` (optional)	Git commit author, with `name` and `email`

Output

Field	Type	Description
`commitSha`	`string`	SHA of the commit
`targetPath`	`string`	Path in the catalog repository where the file was written

Example: staging then publishing a catalog entity

steps:
  - id: write-catalog
    name: Write catalog entity
    action: ske:write-manifest
    input:
      targetPath: catalog/catalog-info.yaml
      manifest: |
        apiVersion: backstage.io/v1alpha1
        kind: Component
        metadata:
          name: ${{ parameters.objname }}
          namespace: ${{ parameters.objnamespace }}
        spec:
          type: service
          lifecycle: production
          owner: kratix-platform

  - id: publish-catalog
    name: Publish catalog entity
    action: ske:publish-catalog
    input:
      filePath: catalog/catalog-info.yaml
      targetPath: kratix/backstage/resources/${{ parameters.objnamespace }}/${{ parameters.objname }}/catalog-info.yaml
      repoUrl: https://gitea-http.gitea/gitea_admin/kratix
      branchName: main
      type: github
      token: ${{ parameters.token }}

Endpoints

The plugin registers under the ske plugin ID, so all endpoints are served under /api/ske.

Both endpoints below are generic: they read or delete whatever object matches the kind/apiVersion/name/namespace you give them — via the Kubernetes API in kubernetes mode, or via git in gitops/hybrid mode, subject to the backend's configured access (RBAC for Kubernetes, git credentials otherwise). Nothing in the plugin restricts them to Resource Requests specifically — you could point them at a Promise, or any other CRD or object the backend can reach. In practice, ske-frontend only ever calls them for Resource Requests, so that's the intended usage, but it's a convention rather than an enforced scope.

Method & path	What it does
`GET /api/ske/resource`	Reads a single Kubernetes object by `name`, `namespace`, `kind`, and `apiVersion` query params
`POST /api/ske/delete-resource`	Deletes a Kubernetes object, given `name`, `namespace`, `kind`, and `apiVersion` in the request body

`GET /api/ske/resource`

Reads an object's manifest. Used by ske-frontend to read a Resource Request's manifest, but works for any kind/apiVersion.

Query parameters

Param	Required	Description
`name`	yes	Object name
`kind`	yes	Object kind (e.g. the `kind` of a Resource Request, but not restricted to that)
`apiVersion`	yes	Object apiVersion
`namespace`	no	Defaults to `default`

Returns { "manifest": <object> } on success, 404 if not found, 400 if a required param is missing.

`POST /api/ske/delete-resource`

Deletes an object. Used by ske-frontend to delete a Resource Request, but works for any kind/apiVersion.

Body

Field	Required	Description
`name`	yes	Object name
`kind`	yes	Object kind (e.g. the `kind` of a Resource Request, but not restricted to that)
`apiVersion`	yes	Object apiVersion
`namespace`	no	Defaults to `default`

In gitops or hybrid mode, returns { "commitHash": <string> }. In kubernetes mode, returns the Kubernetes deletion status.

Overview​

Actions​

ske:configure-resource​

ske:write-manifest​

ske:publish-catalog​

Endpoints​

GET /api/ske/resource​

POST /api/ske/delete-resource​

Overview

Actions

`ske:configure-resource`

`ske:write-manifest`

`ske:publish-catalog`

Endpoints

`GET /api/ske/resource`

`POST /api/ske/delete-resource`