See Meredith Slota (Unlicensed)'s 1-pager and the epic issue:
In summary, we
We should strongly consider deprecating these calls in favor of the new API, see below section 'API Additions'
URL | HTTP Type | Description | Response Object |
---|---|---|---|
/entity/{id}/doi | PUT | Creates a DOI for the specified entity. The DOI will associated with the most recent version where applicable. | Doi |
/entity/{id}/version/{versionNumber}/doi | PUT | Creates a new DOI for the specified entity version. | Doi |
/entity/{id}/doi | GET | Gets the DOI status for the specified entity. | Doi |
/entity/{id}/version/{versionNumber}/doi | GET | Gets the DOI status for the specified entity version. | Doi |
The new fields in object is a direct mapping of the most recent version (v4.1) of DataCite's metadata schema, simplified to contain only required fields and a small amount of optional fields that we curate. This ensures that we don't need to deprecate our API if we wish to support more of their optional metadata fields. If we do wish to support new optional metadata fields, we can easily extend our object.
Similarly, this is likely to simplify future transitions if DataCite deprecates the schema that we configure to use.
DataCite-imposed constraints for implementing clients to consider:
/[\d]{4}/
)URL | HTTP Verb | Description | Request Object | Response Object | Notes |
---|---|---|---|---|---|
/doi/async/start | POST | Asynchronously create or update a DOI. If the DOI does not exist, start a DOI creation job that will attempt to register a DOI with the DOI provider with the supplied metadata. If the DOI does exist, then it will simply update the DOI with the supplied metadata. Note: The caller must have the ACCESS_TYPE.UPDATE permission on the Entity to make this call. | Doi (application/json) | Shift the work to an asynchronous worker queue (as we have been doing with other asynchronous services). We combine the create and update calls because they require the same information and are both idempotent. The Doi object must contain all fields required to mint or update a DOI with DataCite. | |
/doi/async/get/{asyncToken} | GET | Asynchronously get the results of a DOI transaction started with POST /doi/async/start Note: When the result is not ready yet, this method will return a status code of 202 (ACCEPTED) and the response body will be a AsynchronousJobStatus object. | None | Get the status of the asynchronous job. If complete, returns the Doi object created by the job. | |
/doi | GET | Get a Doi object (including associated metadata) for the object referred to in DoiRequest, if the Doi object exists. | None (supply required path parameters id, objectType, and optional objectVersion) | Doi | This call relies on availability of DataCite's API to return the metadata, as we do not store it. |
/doi/association | GET | Get a DoiAssociation object that contains the DOI of an object referred to in DOI. | None (supply required path parameters id, objectType, and optional objectVersion) | DoiAssociation | By making this call, a client can get the DOI of an object without certain metadata that relies on availability of DataCite's API. |
/doi/locate | GET | Redirect to a specific object in the web portal, or a "Not found" page if the object cannot be located. | None (supply required path parameters id, objectType, and optional objectVersion) | Redirect | This redirects a URL that we supply to DataCite to the current URL of an associated object. This allows us to register a more "permanent" URL with DataCite in case the URL to an object changes. For example, http://synapse.org/#!Synapse:syn123 may change and become http://sage.gov/syn123. This service can be updated to support that and as a result, the DOI does not break. |
DataCite has two APIs that we can use. They have a standard "MDS" API that they recommend for users, and they have a new (but also seemingly temporary) "EZ" API that is designed for orgs like us who are transitioning from EZID.
For the sake of not having to do more work later, we are opting to not use DataCite's temporary EZ API that is designed to mock the EZID API.
Instead, we will be using their standard MDS API, as we would need to transition to it eventually anyways.
With the MDS API the basic workflow to create a DOI is to
Simply updating the metadata requires just step 1. Both of the above calls are idempotent, so we can combine create and update calls and simply treat the implementation as a create. This would simplify the implementation, though an unnecessary outgoing PUT call would made when existing DOIs are updated.
DataCite requires that new DOIs have associated metadata that adheres to a schema that they revise occasionally. The current version of their schema is v4.1 (Oct 2017). Metadata that we have registered through EZID is adherent to v2.2 (June 2011), v3, and v4. It is unclear if/when DataCite will deprecate v2.2 and no longer accept it. In another attempt to future-proof our DOI minting service, we will only submit metadata adherent to v4.1.
As a result of this, we must be able to retrieve metadata adherent to schemas 2.2+ in order for the client to update it. We can create a translator tool to convert data from these schemas to an intermediate object (see new fields in Doi above) that can hold the appropriate metadata. This object can be translated into the most recent version of the schema. The client can retrieve and submit this object by interfacing with our API
DataCite has now approved us to transition to their service, so we should coordinate to transition as soon as possible.
Mockup of what the DOI minting form could look like. This form could be presented when a user clicks "Mint DOI for this Project/File" (as they currently do)
More mockups may be added later
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