Catalog-API
The Catalog-API is the main interface for apps and frontends to communicate with the Purple backend.
This documentation is intended for technical users (integrators and developers).
Overview
The Catalog-API is based on GraphQL. This allows for a type-safe and clearly defined schema while also allowing to query only the data you need.
This documentation assumes familiarity with GraphQL. Please read the official website's Introduction to GraphQL to learn about the concepts if you have never worked with GraphQL before.
To get started working with our API, you can use the online editor GraphiQL. It allows building and testing your queries without having to setup a local development environment.
We also offer an interactive visualization of all the types and their relations using the GraphQL Voyager tool.
You can view inline documentation of all the available types in both tools and your local development environment as the GraphQL schema offers direct support for documentation.
The endpoint that GraphQL clients have to use is: https://catalog.purplemanager.com/graphql
Queries
The Catalog-API offers both the Query and Mutation root types.
The most important part of the Catalog-API is the ability to query the contents and it's metadata of your app or website.
The entrypoint for this is the catalog field in the Query root type. The required arguments define the basic information that all other queries use.
Common request parameters
AppInfo
The AppInfo type holds the reference to your appId (the ID of your app or website in our system), the appVersion (the version of your app) and the preview flag (determines if you want preview or live contents).
You can find the appId in the Purple Manager when editing the app. It is currently only visible in the URL.
Here the appId is "01fd7648-10c1-4478-bd98-a7df762f526b"
DeviceInfo
The DeviceInfo type holds information about the requesting system. The deviceId is used to uniquely identify the system and allow access to previously anonymously purchased contents, e.g. in app stores.
If you are requesting data from a website you should generate a unique ID, e.g. an UUID, and store it in the local storage of the browser.
The platform defines the platform that is being used to request dats. Currently we differentiate between ANDROID, IOS and WEB. It is also used to filter the available contents, e.g. if you want certain contents to be only available on one platform or deliver different version to different platforms.
The deviceModel and deviceOSs fields are used to determine the device class, e.g. tables or phone for iOS, and for statistical and auditing purposes. Please provide accurate data about the model, e.g. the model name of the device or browser name, and the version of the device or browser.
The smallestScreenWidthDp field is only used for the ANDROID platform to determine the device class.
Authorization
The Authorization type is used to provide access tokens and subscription codes (coupon codes) to determine access and purchase status for contents.
Pagination
Most queries for data support paging using the GraphQL Cursor Connections Specification (arguments first and after). You can identify this by the Connection suffix at the fieldnames which support paging.
All APIs limit the maximum number of entries to 200 per query. If you need to request more data you will need to request pages using the after argument.
Filtering and sorting
All connections support filtering and sorting the results.
Filtering
To filter the results you can use the filter parameter. The filters provide matchers for many fields of the Connections return type. You can however only use one field matcher at a time. To match based on multiple fields you have to combine multiple filters using the AND and OR fields.
Example: Filter for name or description containing the word "Sun" Expand source
Sorting
The filtered results can be sorted using the sort parameter. Each comparator type allows defining the field that is used to compare for the sort and the direction (ascending or descending). Multiple comparators can also be chained, e.g. to sort by publication date and then name.
Example: Sort by publicationDate and name Expand source
Contents (Issues, Posts and Bundles)
The contentsConnection can be used to query issues, posts and bundles of an app. The results can be filtered and sorted using the filter and sort arguments.
The contents have three major types that share the common Content interface.
Issue
Issues are magazine style contents. They usually have multiple pages and use our Storytelling Engine and can display animations, PDFs and other media.
Post
Posts are (news) article contents produced using our Purple Hub.
Bundle
Bundles are collections of Posts and are also produced using our Purple Hub.
Example queries
Publications
Publications are the main container for contents. Every content is assigned to one publication.
The publicationsConnection can be used to query the publications of an app. The results can be filtered and sorted using the filter and sort arguments.
Example queries
Subscriptions
Apps can offer subscriptions to their users. Currently only native app store subscriptions are supported. Subscriptions are only unlocking contents for publications which there are assigned to.
The subscriptionsConnection can be used to query the subscriptions of an app. The results can be filtered and sorted using the filter and sort arguments.
Example queries
Publication Products
Publication products allows publishers, depending of the type of the product, to offer users to purchase all previously published content or use the same (consumable) app store product for multiple purchases of different contents. Publication products are only unlocking contents for publications which there are assigned to.
The publicationProductsConnection can be used to query the available product of an app. The results can be filtered and sorted using the filter and sort arguments.
Example queries
Taxonomies
The taxonomiesConnection can be used to query the taxonomies, e.g. tags and categories, of an app. The results can be filtered and sorted using the filter and sort arguments.
Example queries
Collections
Collections are curated lists of posts/articles.
The collectionsConnection can be used to query the collections of an app. The results can be filtered and sorted using the filter and sort arguments.
Example queries
Menus
Menus are currently only used for websites. They allow dynamically configuring the menu of a Purple-based website.
The menusConnection can be used to query the menus of an app. The results can be filtered using the filter argument.
Example queries
Search
The API allows to perform full-text searches across all contents of an app.
The contentSearchConnection can be used to perform full-text searches.
Example queries
API Keys
The Catalog API can be secured using an API key. In order to activate the authorisation for the API you need to activate the check mark next to "Secured Mode" in the "Basic Settings" tab for you App in the Purple Manager:
Once the secure mode is activated, the API key can be found in the app.xml. To get the app.xml, navigate to the Overview tab of your App in the Purple Manager. Click on the Android symbol next to "App XML". The app.xml will be opened in a new tab. Searching for "app_api_key" (CTRL-F), will take to you the tag holding the API key.
