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CollectionSpace Service REST-based APIs

CollectionSpace Service REST-based APIs. June 2009 Face-to-face Aron Roberts U.C. Berkeley IST/Data Services. Agenda. Overview : REST in 3 slides Summary : REST-based APIs proposed for the Services Layer Request : Feedback (later-on). REST … in 1 slide ….

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CollectionSpace Service REST-based APIs

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  1. CollectionSpace ServiceREST-based APIs June 2009 Face-to-face Aron Roberts U.C. Berkeley IST/Data Services

  2. Agenda • Overview: REST in 3 slides • Summary: REST-based APIsproposed for the Services Layer • Request: Feedback (later-on) CollectionSpace

  3. REST … in 1 slide … • “… resources are just consistent mappings from an identifier [such as a URL path] to some set of views on server-side state. • “If one view doesn’t suit your needs, then feel free to create a different resource that provides a better view … • “These views need not have anything to do with how the information is stored on the server … [They just need] to be understandable (and actionable) by the recipient.” – Roy T. Fielding CollectionSpace

  4. REST … in 2 slides … Every resource is URL-addressable: /collectionobjects/collectionobjects/{id}  /loans You can get creative! /collectionobjects/moviescripts /loans/overdue CollectionSpace

  5. REST … in 3 slides … To change system state, simply change a resource. Within the /collectionobjects “bucket”, you can: • Create an item • Update an item with new data • Delete an item CollectionSpace

  6. RESTful APIs (proposed) Create  POST a new item to a “bucket” POST /collectionobjects Read  GET an item by its ID GET /collectionobjects/{id} Read (multiple)  GET the items in a “bucket” GET /collectionobjects CollectionSpace

  7. RESTful APIs (proposed) Read (multiple)  GET the items in a “bucket” GET /collectionobjects Need to define details of: • IDs – CSIDs, museum numbers • Filtering – child resources, query parameters • Paging • Formats returned – URLs, full records CollectionSpace

  8. RESTful APIs (proposed) Update  PUT a fully updated item to an ID PUT /collectionobjects/{id} (Partial updates not REST-defined, however.) Delete  DELETE an item by its ID GET /collectionobjects/{id} Resource discovery  GET a schema GET /collectionobjects/schema(Others needed?) CollectionSpace

  9. RESTful APIs (proposed) Search  Not REST-defined. Often: GET /collectionobjects?q=term Need to define: • “Simple” search • Fully-specified search – Resource-oriented – Query parameters – Forms submission CollectionSpace

  10. RESTful APIs (proposed) Search  (cont’d) If we model searches as resources: Create POST a new search POST /searches Read GET search results GET /searches/{id}/results Searches might thus be saved, shared … CollectionSpace

  11. Status Codes HTTP status codes returned in the response header: • 200 OK The resource was read, updated, or deleted. • 201 Created  The resource was created. • 400 Bad Request  The data sent in the request was bad. • 403 Not Authorized  The Principal named in the request was not authorized to perform this action. • 404 Not Found  The resource does not exist. • 409 Conflict  A duplicate resource could not be created. • 500 Internal Server Error  A service error occurred. CollectionSpace

  12. Error Responses Response in body when a 4xx or 5xx status is returned: <error> <code>Mandatory code</code> <message>Optional message</message> <resource-id>Resource ID, if available</resource-id> <request-uri>URI of request</request-uri> </error> CollectionSpace

  13. More info REST-based APIs http://wiki.collectionspace.org/x/yYD8 Common System Specific Elements http://wiki.collectionspace.org/x/iID8 (payloads, error messages, and more!) CollectionSpace

  14. Feedback • Eagerly invited. (Probably later on!) • We seek consistency, and to share ideas, with other CollectionSpace teams re REST-based APIs. CollectionSpace

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