Permissions

Permissions are rooted in the /v1/permissions collection.

Each permission is the basic unit to provide a way to limit applications’ access to sensitive information.

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.

Authorization notes

When modifying permissions, the caller must have permissions/write permissions on the path /.

When reading permissions, the caller must have permissions/read permissions on the path /.

Minimum permissions

Delta is configured to include minimum permissions, i.e. permissions that cannot be removed, because they are necessary for correct functioning of Nexus.

Currently the following permissions are required:

  • default permissions for acls, with the exception that everyone should be able to see his own permissions

    • acls/read
    • acls/write

  • default permissions for permissions

    • permissions/read
    • permissions/write

  • default permissions for realms

    • realms/read
    • realms/write

  • generic permissions for full read access to the global event log

    • events/read

  • default permissions for organizations

    • organizations/read
    • organizations/write
    • organizations/create

  • default permissions for projects

    • projects/read
    • projects/write
    • projects/create

  • default permissions for resources

    • resources/read
    • resources/write

  • default permissions for resolvers

    • resolvers/write

  • default permissions for views

    • views/query
    • views/write

  • default permissions for schemas

    • schemas/write

  • default permissions for files

    • files/write

Replace permissions

This operation overrides the collection of permissions.

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

…where {previous_rev} is the last known revision number for the permissions. If there are only minimum permissions present present, this query parameter can be omitted.

The json payload contains the set of permissions to be added.

Example

Request
curl -XPUT -H "Content-Type: application/json" "https://nexus.example.com/v1/permissions?rev=1" -d \
'{
  "permissions": [
    "newpermission/read",
    "newpermission/write"
  ]
}'
Payload
{
  "permissions": [
    "newpermission/read",
    "newpermission/write"
  ]
}
Response
{
  "@context": [
    "https://bluebrain.github.io/nexus/contexts/iam.json",
    "https://bluebrain.github.io/nexus/contexts/resource.json"
  ],
  "@id": "https://nexus.example.com/v1/permissions",
  "@type": "Permissions",
  "_rev": 2,
  "_createdAt": "2019-01-22T13:15:54.667Z",
  "_createdBy": "https://nexus.example.com/v1/anonymous",
  "_updatedAt": "2019-01-22T13:22:03.007Z",
  "_updatedBy": "https://nexus.example.com/v1/anonymous"
}

Subtract permissions

This operation removes the provided permissions from the existing collection of permissions.

PATCH /v1/permissions?rev={previous_rev}
  {...}

…where {previous_rev} is the last known revision number for the permissions.

The json payload contains the set of permissions to be deleted. Example

Request
curl -XPATCH -H "Content-Type: application/json" "https://nexus.example.com/v1/permissions?rev=2" -d \
'{
  "@type": "Subtract",
  "permissions": [
    "newpermission/write"
  ]
}'
Payload
{
  "@type": "Subtract",
  "permissions": [
    "newpermission/write"
  ]
}
Response
{
  "@context": [
    "https://bluebrain.github.io/nexus/contexts/iam.json",
    "https://bluebrain.github.io/nexus/contexts/resource.json"
  ],
  "@id": "https://nexus.example.com/v1/permissions",
  "@type": "Permissions",
  "_rev": 1,
  "_createdAt": "2019-01-22T13:15:54.667Z",
  "_createdBy": "https://nexus.example.com/v1/anonymous",
  "_updatedAt": "2019-01-22T13:22:03.007Z",
  "_updatedBy": "https://nexus.example.com/v1/anonymous"
}

Append permissions

This operation appends the provided permissions to the existing collection of permissions.

PATCH /v1/permissions?rev={previous_rev}
  {...}

…where {previous_rev} is the last known revision number for the permissions.

The json payload contains the set of permissions to be added.

Example

Request
curl -XPATCH -H "Content-Type: application/json" "https://nexus.example.com/v1/permissions?rev=3" -d \
'{
  "@type": "Append",
  "permissions": [
    "newpermission/create"
  ]
}'
Payload
{
  "@type": "Append",
  "permissions": [
    "newpermission/create"
  ]
}
Response
{
  "@context": [
    "https://bluebrain.github.io/nexus/contexts/iam.json",
    "https://bluebrain.github.io/nexus/contexts/resource.json"
  ],
  "@id": "https://nexus.example.com/v1/permissions",
  "@type": "Permissions",
  "_rev": 2,
  "_createdAt": "2019-01-22T13:15:54.667Z",
  "_createdBy": "https://nexus.example.com/v1/anonymous",
  "_updatedAt": "2019-01-22T13:22:03.007Z",
  "_updatedBy": "https://nexus.example.com/v1/anonymous"
}

Delete all permissions

This operation deletes the all the user defined permission and resets the collection to minimum permissions.

DELETE /v1/permissions?rev={previous_rev}

…where {previous_rev} is the last known revision number for the permissions.

Request
curl -XDELETE "https://nexus.example.com/v1/permissions?rev=4"
Response
{
  "@context": [
    "https://bluebrain.github.io/nexus/contexts/iam.json",
    "https://bluebrain.github.io/nexus/contexts/resource.json"
  ],
  "@id": "https://nexus.example.com/v1/permissions",
  "@type": "Permissions",
  "_rev": 3,
  "_createdAt": "2019-01-22T13:15:54.667Z",
  "_createdBy": "https://nexus.example.com/v1/anonymous",
  "_updatedAt": "2019-01-22T13:22:03.007Z",
  "_updatedBy": "https://nexus.example.com/v1/anonymous"
}

Fetch permissions (latest revision)

GET /v1/permissions
Request
curl "https://nexus.example.com/v1/permissions"
Response
{
  "@context": [
    "https://bluebrain.github.io/nexus/contexts/iam.json",
    "https://bluebrain.github.io/nexus/contexts/resource.json"
  ],
  "@id": "https://nexus.example.com/v1/permissions",
  "@type": "Permissions",
  "permissions": [
    "acls/read",
    "acls/write",
    "events/read",
    "files/write",
    "organizations/create",
    "organizations/read",
    "organizations/write",
    "permissions/read",
    "permissions/write",
    "projects/create",
    "projects/read",
    "projects/write",
    "realms/read",
    "realms/write",
    "resolvers/write",
    "resources/read",
    "resources/write",
    "schemas/write",
    "views/query",
    "views/write"
  ],
  "_rev": 10,
  "_createdAt": "2019-01-22T13:15:54.667Z",
  "_createdBy": "https://nexus.example.com/v1/anonymous",
  "_updatedAt": "2019-01-22T13:22:03.007Z",
  "_updatedBy": "https://nexus.example.com/v1/anonymous"
}

Fetch permissions (specific revision)

GET /v1/permissions?rev={rev}

…where {rev} is the revision number of the permissions to be retrieved.

Request
curl "https://nexus.example.com/v1/permissions?rev=1"
Response
{
  "@context": [
    "https://bluebrain.github.io/nexus/contexts/iam.json",
    "https://bluebrain.github.io/nexus/contexts/resource.json"
  ],
  "@id": "https://nexus.example.com/v1/permissions",
  "@type": "Permissions",
  "permissions": [
    "acls/read",
    "acls/write",
    "events/read",
    "files/write",
    "organizations/create",
    "organizations/read",
    "organizations/write",
    "permissions/read",
    "permissions/write",
    "projects/create",
    "projects/read",
    "projects/write",
    "realms/read",
    "realms/write",
    "resolvers/write",
    "resources/read",
    "resources/write",
    "schemas/write",
    "views/query",
    "views/write"
  ],
  "_rev": 3,
  "_createdAt": "2019-01-22T13:15:54.667Z",
  "_createdBy": "https://nexus.example.com/v1/anonymous",
  "_updatedAt": "2019-01-22T13:22:03.007Z",
  "_updatedBy": "https://nexus.example.com/v1/anonymous"
}

Permissions Server Sent Events

This endpoint allows clients to receive automatic updates from the permissions in a streaming fashion.

GET /v1/permissions/events

where Last-Event-Id is an optional HTTP Header that identifies the last consumed permission event. It can be used for cases when a client does not want to retrieve the whole event stream, but to start after a specific event.

The response contains a series of permission events, represented in the following way

data:{payload}
event:{type}
id:{id}

where…

  • {payload}: Json - is the actual payload of the current permission
  • {type}: String - is a type identifier for the current permission. Possible types are: PermissionsAppended, PermissionsSubtracted, PermissionsReplaced and PermissionsDeleted
  • {id}: String - is the identifier of the permission event. It can be used in the Last-Event-Id HTTP Header

Example

Request
curl "https://nexus.example.com/v1/permissions/events"
Response
data:{"@context":["https://bluebrain.github.io/nexus/contexts/iam.json","https://bluebrain.github.io/nexus/contexts/resource.json"],"@type":"PermissionsAppended","permissions":["resources/write","views/query"],"_rev":1,"_instant":"2019-06-14T11:57:04.039Z","_subject":"https://nexus.example.com/v1/realms/nexusdev/users/myuser"}
event:PermissionsAppended
id:8693f7b0-8e9b-11e9-a8f6-c5c16f2312d6

data:{"@context":["https://bluebrain.github.io/nexus/contexts/iam.json","https://bluebrain.github.io/nexus/contexts/resource.json"],"@type":"PermissionsSubtracted","permissions":["views/query"],"_rev":2,"_instant":"2019-06-14T11:57:05.771Z","_subject":"https://nexus.example.com/v1/realms/nexusdev/users/myuser"}
event:PermissionsSubtracted
id:879c3ff0-8e9b-11e9-a8f6-c5c16f2312d6

data:{"@context":["https://bluebrain.github.io/nexus/contexts/iam.json","https://bluebrain.github.io/nexus/contexts/resource.json"],"@type":"PermissionsReplaced","permissions":["schemas/write","views/write","files/write","permissions/write","acls/write","realms/write","projects/read","acls/read","organizations/create","tcmbsyeq/rcxpdxng","organizations/write","resources/write","realms/read","projects/create","storages/write","permissions/read","resources/read","organizations/read","resolvers/write","events/read","views/query","projects/write"],"_rev":3,"_instant":"2019-06-14T11:57:07.277Z","_subject":"https://nexus.example.com/v1/realms/nexusdev/users/myuser"}
event:PermissionsReplaced
id:88820c10-8e9b-11e9-a8f6-c5c16f2312d6
e09abb53