Amphora RSS

Notice

This is a pre-1.x version of the renderer and the API is subject to change. It's recommended to install a specific version of the package until a stable API is reached.

Install

$ npm install --save amphora-rss

Use Case

The primary use case for this renderer is when you want to use component instances to generate RSS feeds. Using this renderer, you can turn feeds into components that can be edited through the Kiln interface to effectively move feed generation to component configuration.

How To

This renderer is highly dependent on the component API provided by Amphora and therefore relies on a component that can generate a feed of documents to be passed off to the renderer. Here's an example implementation

• An rss-feed component stores within itself the logic to query some service that generates feeds and stores the results within its own instance data.
• Using the renderer specific model.js file the data of the component is trimmed down into an object with two specific properties:
  • feed: an Array of objects (read below for structure specification)
  • meta: an Object with properties that will be used in generating RSS meta tags at the top of the feed
• The data is passed to this render which turns feed data into an RSS document

Data Specification

Updating Namespaces

This renderer has default namespaces which gets injected at the top of the rss feed. These namespaces are contained inside of the defaultNamespaces object. The namespaces can be overridden, removed or extended by attaching namespaces to the attr object. Since we merge this attr with defaultNamespaces and remove null values, attr keys with null values will not be included in the feed. attr keys with different namespaces will be added as an additional namespace to the feed. If a key holds the same namespace which exists within defaultNamespaces (and the value is not null) we will use the value of the attr namespace.

• To remove a default namespace, set the value of that namespace to null inside the attr object. To modify a namespace, change the value of that similar namespace inside the attr object. To add a new namespace, add a key:value pair to the attr object where the key is a namespace that isn't used within defaultNamespaces, and the value is the url.

defaultNamespaces: { version: '2.0', 'xmlns:content': 'http://purl.org/rss/1.0/modules/content/', 'xmlns:mi': 'http://schemas.ingestion.microsoft.com/common/', 'xmlns:dc': 'http://purl.org/dc/elements/1.1/', }

attr: { "xmlns:itunes": "http://www.itunes.com/dtds/podcast-1.0.dtd", "xmlns:mi": null, "xmlns:dc": "http://purl.org/dc/elements/2.1/", }

### `feed` Array

At it's core, this renderer is a wrapper around the [`xml` package](https://www.npmjs.com/package/xml) to build the XML for the feed. This means that it is the responsibility of the renderer specific `model.js` file to create a `feed` object that abides by the API of this package. Refer to the package [README](https://github.com/dylang/node-xml/blob/master/readme.md) for structure of this array.

### Meta

The `meta` object is a very simple object composed of few properties which are used in composition of the XML.

- `title`: a string rendered in the `<title>` tag of the XML document
- `description`: a string rendered in the `<description>` tag of the XML document
- `link`: a string rendered in the `<link>` tag of the XML document
- `copyright` _(optional)_: a string or number rendered in the `<copyright>` tag of the XML document. If not provided, the current year will be used.
- `generator` _(optional)_: a string rendered in the `<generator>` tag of the XML document. Defaults to `Feed delivered by Clay`.
- `docs`: a string rendered in the `<docs>` tag of the XML document. Defaults to `http://blogs.law.harvard.edu/tech/rss`.