Difference between revisions of "Sword API"
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Revision as of 17:34, 20 March 2014
One of the 1.1 release features is a sponsored project to integrate Archivematica with Islandora. This integration will be accomplished by creating a Sword 2.0 API for the Archivematica storage service. Islandora development work will add functionality to Islandora to use this API to deposit digital objects into Archviematica.
As described elsewhere on this wiki, "the primary function of Archivematica is to process digital transfers (accessioned digital objects), turn them into SIPs, apply format policies and create high-quality, repository-independent Archival Information Packages (AIP)".
The Archivematica Sword API allows 3rd party applications to automate the process of creating Transfers.
- Create Transfer - set the name and other metadata about a Transfer
- Populate Transfer - add/edit/update digital objects in a Transfer, and associated metadata
- Finalize Transfer - indicates that the Transfer is ready to start processing.
After content has been deposited, if users have access to the deposit directory they can also manually manipulate the deposit directory aside from any manipulation using the API.
Once a Transfer has been created, populated and finalized, Archivematica will begin processing that Transfer.
The SWORD API is part of the Archivematica storage service REST API. The storage service also talks to the Archivematica dashboard, however, to notify it that a, transfer created from a SWORD deposit, has been approved for processing.
To use the SWORD API you must install the Archivematica dashboard 1.0 branch and the Archivematica storage service dev/issue-5980-islandora branch.
- In dashboard REST API administration, add the IP of the storage service server to IP whitelist
- In dashboard user administration, take note of username and API key for a dashboard user (example: user "demo" and API key "4e5f32ab2aefd3543e1b19a2de554dd65f90108a")
- In dashboard general admininstration, take note of the dashboard's UUID
Storage service configuration:
- In the storage service web interface's Pipelines tab, find the dashboard pipeline (using dashboard's UUID noted during dashboard configuration)
- Enter the dashboard's IP address into the "Remote name" field and the user and API key noted earlier into the "Api username" and "Api key" fields. Click the button to submit these changes.
After configuration you'll need to find the space UUID of the SWORD server. To do so, in the web interface's Spaces tab, click "View Details and Locations" for the SWORD server. The UUID will be shown at the top of the screen. The UUID is used to figure out the initial API URL to access (for example: "http://localhost:8000/api/v1/space/c0bee7c8-3e9b-41e3-8600-ee9b2c475da2/sword/collection/").
Below is an example session using curl to manipulate the API. In the example a deposit is created, a file is added to it, and it is finalized.
NOTE: The SWORD API is in the process of being moved to the storage service. These URLs may not work.
# create new deposit, providing a METS file specifying digital object URLs to download in the background curl -v -H "In-Progress: true" --data-binary @mets.xml --request POST http://localhost:8000/api/v1/space/c0bee7c8-3e9b-41e3-8600-ee9b2c475da2/sword/collection/ # response XML includes endpoints for adding additional files, etc. # add a single file to the deposit curl -v -H "Content-Disposition: attachment; filename=cat.jpg" --request POST \ --data-binary "@cat.jpg" \ http://127.0.0.1:8000/api/v1/location/9c8b4ac0-0407-4360-a10d-af6c62a48b69/sword/media/ # start another background download of resources specified in a METS curl -v -H "In-Progress: true" -H "Packaging: METS" --data-binary @mets.xml --request POST http://127.0.0.1:8000/api/v1/location/9c8b4ac0-0407-4360-a10d-af6c62a48b69/sword/media/ # finalize transfer and approve processing curl -v -H "In-Progress: false" --request POST http://127.0.0.1:8000/api/v1/location/149cc29d-6472-4bcf-bee8-f8223bf60580/sword/
You might, at some point, want to list the transfers that have been started. The following curl command will do so.
curl -v http://localhost:8000/api/v1/space/c0bee7c8-3e9b-41e3-8600-ee9b2c475da2/sword/collection/
If you're working on a transfer and want to list what files are included in it, the following curl command will list them.
# list files in transfer curl -v http://127.0.0.1:8000/api/v1/location/9c8b4ac0-0407-4360-a10d-af6c62a48b69/sword/media/
If you've started a deposit, but want to discard it, you can delete the deposit. The following curl command shows an example.
curl -v -XDELETE http://127.0.0.1:8000/api/v1/location/149cc29d-6472-4bcf-bee8-f8223bf60580/sword/
Single step deposit
If you wanted to deposit a transfer then immediately finalize it, after background downloading is complete, you could use something like the following curl command.
curl -v -H "In-Progress: false" --data-binary @mets.xml --request POST http://localhost:8000/api/v1/space/c0bee7c8-3e9b-41e3-8600-ee9b2c475da2/sword/collection/
The SWORD service document provides information about the SWORD provider's capacities and lists SWORD collections. Archivematica currently includes one SWORD collection to which SWORD deposits can be made: transfers.
The SWORD service document endpoint is located at /api/v1/sword/.
Service document example:
<service xmlns:dcterms="http://purl.org/dc/terms/" xmlns:sword="http://purl.org/net/sword/terms/" xmlns:atom="http://www.w3.org/2005/Atom" xmlns="http://www.w3.org/2007/app"> <sword:version>2.0</sword:version> <workspace> <atom:title>Archivematica storage service</atom:title> <collection href="http://192.168.1.231:8000/api/v1/space/8f24ef5f-19d5-4b77-8a38-b30d034b11e7/sword/collection/"> <atom:title>Collection</atom:title> <accept>*/*</accept> <accept alternate="multipart-related">*/*</accept> <sword:mediation>false</sword:mediation> </collection> </workspace> </service>
List existing transfers
- HTTP Get to the Collection IRI (defined by default as: /api/v1/space/[space UUID]/sword/collection/)
- Transfers are listed as an Atom feed
- Each Atom feed entry contains an "atom:link" element whose href attribute contains the URL needed to get details about the transfer
- optional filters via get parameters (not yet implemented)
<atom:feed xmlns="http://www.w3.org/2005/Atom"> <atom:id>http://192.168.1.231:8000/api/v1/space/8f24ef5f-19d5-4b77-8a38-b30d034b11e7/sword/collection/</atom:id> <atom:title type="text">Deposits</atom:title> <atom:link href="http://192.168.1.231:8000/api/v1/space/8f24ef5f-19d5-4b77-8a38-b30d034b11e7/sword/collection/" rel="self"> </atom:link> <atom:entry> <atom:id>http://192.168.1.231:8000/api/v1/location/88e70cd2-9258-4a84-8938-16e74be032e6/sword/</atom:id> <atom:title type="text">Cinderella</atom:title> <atom:link href="http://192.168.1.231:8000/api/v1/location/88e70cd2-9258-4a84-8938-16e74be032e6/sword/" rel="self"> </atom:link> </atom:entry> </atom:feed>
Create a new transfer
- used to start a new transfer in Archivematica
- HTTP POST of an Atom Entry Document to the Collection IRI (defined by default as: /api/v1/space/[space UUID]/sword/collection/)
Possible HTTP Response Codes
- HTTP 200 OK - transfer already exists (not yet implemented)
- HTTP 201 Created - transfer has been accepted
- HTTP 412 Precondition Failed - required metadata missing or invalid
Valid requests will receive a Sword Deposit Receipt in the body of the response.
Required HTTP Headers The HTTP POST must include certain specific http headers.
Required by http 1.1 specification:
- Host: Must be set to archivematica host name.
- Content-Length: Must be set to the length of the atom entry document.
- Content-Type: Must be set to "application/atom+xml;type=entry".
Required by Archivematica.
- Authorization: Must include the api key and username assigned by Archivematica.
Required by SWORD 2.0 protocol:
- In-Progress: Must be set to "true"
Optional in SWORD 2.0 protocol:
- On-Behalf-Of: not implemented by Archivematica
- Slug: not implemented by Archivematica
Required in Body The Body of the request must be a valid METS Document. The required fields in an Atom Entry Document are:
- LABEL: used as the transfer name
- id: used as an accession id (not yet implemented)
- author: used as the source of acquisition (not yet implemented)
- summary: not implemented yet. Could be used in the future as a description for the Transfer
- updated: should be set to the current timestamp.
Example Example HTTP POST request:
POST /api/v1/space/96606387-cc70-4b09-b422-a7220606488d/sword/collection/ HTTP/1.1 Host: localhost Authorization: Archivematica-API api_key="XXXXXXXXXXXXXXXXXXXX", username="timh" Content-Length: 213 Content-Type: application/atom+xml;type=entry In-Progress: true <?xml version="1.0" encoding="UTF-8"?> <METS:mets EXT_VERSION="1.1" OBJID="islandora:72" LABEL="Cinderella" xmlns:METS="http://www.loc.gov/METS/" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/METS/ http://www.fedora.info/definitions/1/0/mets-fedora-ext1-1.xsd"> <METS:fileSec> <METS:fileGrp ID="DATASTREAMS"> <METS:fileGrp ID="OBJ"> <METS:file ID="OBJ.0"> <METS:FLocat xlink:title="Cinderella_(1865).pdf" LOCTYPE="URL" CHECKSUM="fad0d2f982f317a15804d2e5c4b9efcc" CHECKSUMTYPE="MD5" xlink:href="http://localhost:8080/fedora/get/islandora:72/OBJ/2013-08-12T14:46:43.454Z" /> </METS:file> </METS:fileGrp> </METS:fileGrp> </METS:fileSec> </METS:mets>
201 Created Location: http://localhost/api/v1/location/91d4f258-0050-4914-9d0c-6a74815358d2/sword/ <entry xmlns="http://www.w3.org/2005/Atom" xmlns:sword="http://purl.org/net/sword/" xmlns:dcterms="http://purl.org/dc/terms/"> <title>Cinderella</title> <id>91d4f258-0050-4914-9d0c-6a74815358d2</id> <updated></updated> <generator uri="https://www.archivematica.org" version="1.0"/> <summary>A deposit was started.</summary> <sword:treatment>A deposit directory was created and, optionally, asynchronous download of digital objects.</sword:treatment> <link rel="alternate" href="http://www.swordserver.ac.uk/col1/mydeposit.html"/> <link rel="edit-media" href="http://localhost/api/v1/location/91d4f258-0050-4914-9d0c-6a74815358d2/sword/media/"/> <link rel="edit" href="http://localhost/api/v1/location/91d4f258-0050-4914-9d0c-6a74815358d2/sword/" /> <link rel="http://purl.org/net/sword/terms/add" href="http://192.168.1.76:8000/api/v1/location/91d4f258-0050-4914-9d0c-6a74815358d2/sword/" /> <link rel="http://purl.org/net/sword/terms/statement" type="application/atom+xml;type=feed" href="http://localhost/api/v1/location/91d4f258-0050-4914-9d0c-6a74815358d2/sword/state/" /> </entry>
Add Files to a Transfer
Post file data:
- It is possible to also POST the actual file to a deposit location's EM-IRI (/api/v1/location/[location UUID]/sword/media/)
- The file should be posted as the request body and the filename specified using the Content-Disposition header (as per RFC 6266): for example "Content-Disposition: Attachment; filename=dog.jpg"
- An MD5 checksum for an uploaded file can be provided via the Content-MD5 header (as per RFC 1544): for example "Content-MD5: Q2hlY2sgSW50ZWdyaXR5IQ=="
- If only an Atom Entry Document is POST'ed, Archivematica will look for uri's in the file StructMap section of the METS file, and attempt to GET each file listed, to include in the Transfer. (not yet implemented)
Finalize a Transfer
- POST with no body to the SE-IRI
- set In-Progress HTTP header to : false
- This will tell Archivematica that no further content will be added or removed from the Transfer.
- Archivematica will finish fetching any files that were added previously, and once they have all been downloaded, the Transfer will start through the Archivematica pipeline.
POST http://localhost/api/v1/location/55ce8053-113a-4954-8aa3-fc9771da0bda/sword/ HTTP/1.1 Host: localhost Authorization: Archivematica-API api_key="XXXXXXXXXXXXXXXXXXXX", username="timh" Content-Length: 0 Content-Type: application/atom+xml;type=entry In-Progress: false
The response will be HTTP 200/OK or 400/Error (400 if the Transfer was already finalized). If the transfer doesn't exist the response will be HTTP 404.
Get Status of Transfer
To check Status:
GET the State-IRI in this example:
response will include:
<atom:feed xmlns:sword="http://purl.org/net/sword/terms/" xmlns:atom="http://www.w3.org/2005/Atom"> <atom:category scheme="http://purl.org/net/sword/terms/state" term="failed" label="State"> Deposit initiation: Failed </atom:category> </atom:feed>
the list of possible descriptions is not finalized.
The state term value will either be "processing" (asynchronous deposit still working), "complete" (ready to be finalized), or "failed" (asynchronous deposit encountered an error).
- redirect to Edit-IRI
- used to get basic info about a Transfer with HTTP GET
- can update basic info using HTTP PUT (not yet implemented)
- can allow deletion with HTTP DELETE
- follows the form: /api/v1/location/[deposit location UUID]/sword/
- example: http://192.168.1.231:8000/api/v1/location/09224ddb-4c7d-404c-9218-2f2e1b5a599e/sword/
- Edit-Media IRI
- used to add new objects to an existing transfer
- follows the form: [archivematica hostname]/api/v2/transfer/[uuid of transfer]/media
- example: /api/v1/location/[deposit location UUID]/sword/media/
An HTTP POST to the em-iri for a transfer should include a single file as the body. If the HTTP "Packaging" header is set to "METS" then METS XML can be sent as the body, specifying a list of digital object URLs to download in the background.
An HTTP GET should return a list of files in the transfer
An HTTP DELETE to the em-iri will remove all digital objects from the Transfer. This is a valid operation only while the Transfer is being assembled. Once the Transfer has been finalized, attempting to DELETE will return an error.
The client can replace the metadata of a resource by performing an HTTP PUT of a new Atom Entry on the Edit-IRI. (not yet implemented)
This would be used to update metadata about a transfer, such as the transfer name.
- example: http://localhost/api/v2/transfer/add/1225c695-cfb8-4ebb-aaaa-80da344efa6a (not yet implemented)
- used to retrieve status of transfer
- implemented as Atom document
- example: /api/v1/location/[deposit location UUID]/sword/state/
- should be able to subscribe like RSS feed