Operating on resources

Access to resources in the system depends on the access control list set for them. Depending on the access control list, a caller may need to prove its identity by means of an access token passed to the Authorization header (Authorization: Bearer {token}). Please visit Authentication to learn more about how to retrieve an access token.

All resources in the system share a base set of operations. Assuming a nexus deployment at http(s)://nexus.example.com resource address of /v1/{address} the following operations should apply to most (all) resources:

Fetch the current revision of the resource

GET /v1/{address}

Status Codes

  • 200 OK: the resource is found and returned successfully
  • 404 Not Found: the resource was not found

Fetch a specific revision of the resource

GET /v1/{address}?rev={rev}

… where {rev} is the revision number, starting at 1.

Status Codes

  • 200 OK: the resource revision is found and returned successfully
  • 404 Not Found: the resource revision was not found

Fetch a specific tag of the resource

GET /v1/{address}?tag={tag}

… where {tag} is the tag name linked to a certain revision number.

Status Codes

  • 200 OK: the resource tag is found and returned successfully
  • 404 Not Found: the resource tag was not found

Create a new resource

Depending on whether the resource is a singleton resource or is part of a wider collection of resources of the same type the verbs POST and PUT are used.

For a singleton resource:

PUT /v1/{address}
{...}

For a collection resources:

POST /v1/{collection_address}
{...}

… where {collection_address} is the address of the collection the resource belongs to.

Status Codes

  • 201 Created: the resource was created successfully
  • 400 Bad Request: the resource is not valid or cannot be created at this time
  • 409 Conflict: the resource already exists

Update a resource

In order to ensure a client does not perform any changes to a resource without having had seen the previous revision of the resource, the last revision needs to be passed as a query parameter.

PUT /v1/{address}?rev={previous_rev}
{...}

Status Codes

  • 200 OK: the resource was created successfully
  • 400 Bad Request: the resource is not valid or cannot be updated at this time
  • 409 Conflict: the provided revision is not the current resource revision number

Tag a resource

Links a resource revision to a specific name.

Tagging a resource is considered to be an update as well.

PUT /v1/{address}/tags?rev={previous_rev}
{
   "tag": "{name}",
   "rev": {rev}
}

… where:

  • {name}: String - the name given to the resource at specific revision.
  • {rev}: Number - the revision to link the provided {name}.

Deprecate a resource

Locks the resource, so no further operations can be performed. It also deletes the resource from listing/querying results.

Deprecating a resource is considered to be an update as well. 

DELETE /v1/{address}?rev={previous_rev}

Status Codes

  • 200 OK: the resource was created successfully
  • 400 Bad Request: the resource is not valid or cannot be deprecated at this time
  • 409 Conflict: the provided revision is not the current resource revision number

Status Codes

  • 200 OK: the resource was created successfully
  • 400 Bad Request: the resource is not valid or cannot be created at this time
  • 409 Conflict: the provided revision is not the current resource revision number

Listing

GET /v1/{collection_address}?from={from}&size={size}&{deprecated}&rev={rev}&type={type}&createdBy={createdBy}&updatedBy={updatedBy}

… where all of the query parameters are individually optional.

  • {collection_address} Path - the selected collection to list, filter or search; for example: /v1/projects/, /v1/schemas/{org_label}/{project},
  • {from}: Number - the parameter that describes the offset for the current query; defaults to 0
  • {size}: Number - the parameter that limits the number of results; defaults to 20
  • {deprecated}: Boolean - can be used to filter the resulting resources based on their deprecation status
  • {rev}: Number - can be used to filter the resulting resources based on their revision value
  • {type}: Iri - can be used to filter the resulting resources based on their @type value. This parameter can appear multiple times, filtering further the @type value.
  • {createdBy}: Iri - can be used to filter the resulting resources based on their creator
  • {updatedBy}: Iri - can be used to filter the resulting resources based on the person which performed the last update

  • Note: Some endpoints might not support some of the above query parameters. Please check the specific section of the documentation related tot he endpoint you want to consume for more details.

List response format

The response to any search requests follows the described format:

  "_total": {hits},
  "_maxScore": {maxScore},
  "_next": "{next_page_address}",
  "_results": [
    {
      "@id": "{resource_id}",
      ...
    },
    {
      "@id": "{resource_id}",
      ...
    }
  ]

… where:

  • {hits}: Number - the total number of results found for the requested search.
  • {maxScore} Float - the maximum score found across all hits.
  • {resource_id} Iri - the qualified id for one of the results.

The relationship _next at the top level offer discovery of more resources, in terms of navigation/pagination.

The fields {maxScore} and {score_id} are optional fields and will only be present whenever a q query parameter is provided on the request.

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