Things

Create a new thing

POST
https://ditto.eclipseprojects.io/api/2/things

Creates a thing with a default thingId and a default policyId.

The thing will be empty, i.e. no features, definition, attributes etc. by default.

The default thingId consists of your default namespace and a UUID.

The default policyId is identical with the default thingId, and allows the currently authorized subject all permissions.

In case you need to create a thing with a specific ID, use a PUT request instead, as any thingId specified in the request body will be ignored.

The field _created is filled automatically with the timestamp of the creation. The field is read-only and can be retrieved later by explicitly selecting it or used in search filters.

Body

application/json

JSON representation of the thing to be created. Use '{}' to create an empty thing with a default policy.

_policyPolicy

The initial policy to create for this thing. This will create a separate policy entity managed by resource /policies/{thingId}.

Use the placeholder {{ request:subjectId }} in order to let the backend insert the authenticated subjectId of the HTTP request.

Show child attributes

Policy consisting of policy entries

policyIdstringrequired

Unique identifier representing the policy

entriesPolicyEntriesrequired

Policy entries containing one policy entry for each arbitrary label key

Show child attributes

Single policy entry. Both subjects and resources are optional — they default to empty when absent. An entry may define references to inherit subjects, resources, and namespaces from other entries (local or imported).

Show child attributes
subjectsSubjects

A SubjectEntry defines who is addressed.

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nginx:subjectId1SubjectEntry

Single (Authorization) Subject entry holding its type.

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typestringrequired

The type is offered only for documentation purposes. You are not restricted to any specific types, but we recommend to use it to specify the kind of the subject as shown in our examples.

expirystring<date-time>

The optional expiry timestamp (formatted in ISO-8601) indicates how long this subject should be considered active before it is automatically deleted from the Policy.

Settings for announcements to be made about the subject.

Show child attributes
beforeExpirystring

The duration before expiry when an announcement should be made. Must be a positive integer followed by one of h (hour), m (minute) or s (second).

whenDeletedboolean

Whether an announcement should be made when this subject is deleted.

requestedAcksobject

Settings to enable at-least-once delivery for policy announcements.

Show child attributes
labelsArray<string>

Acknowledgement labels to request when an announcement is published.

timeoutstring

How long to wait for requested announcements before retrying publication of an announcement.

Example
{
  "labels": [
    "my-connection-id:my-issued-acknowledgement"
  ],
  "timeout": "5s"
}
randomizationIntervalstring5m

Interval in which the announcement can be sent earlier than the configured beforeExpiry. The actual point in time when the announcement will be sent is beforeExpire plus a randomly chosen time within the randomizationInterval. E.g assuming beforeExpiry is set to 5m and randomizationInterval is set to 1m, the announcements will be sent between 5 and 6 minutes before the subject expires. If omitted, the default value will be applied. If set to minimum, no randomization will be applied.

Example
{
  "beforeExpiry": "5m",
  "whenDeleted": true,
  "randomizationInterval": "5m"
}
Example
{
  "type": "This is some description for this subject, adjust as needed.",
  "expiry": "2020-12-07T11:36:40Z",
  "announcement": {
    "beforeExpiry": "5m",
    "whenDeleted": true
  }
}
nginx:subjectIdNSubjectEntry

Single (Authorization) Subject entry holding its type.

Show child attributes
typestringrequired

The type is offered only for documentation purposes. You are not restricted to any specific types, but we recommend to use it to specify the kind of the subject as shown in our examples.

expirystring<date-time>

The optional expiry timestamp (formatted in ISO-8601) indicates how long this subject should be considered active before it is automatically deleted from the Policy.

Settings for announcements to be made about the subject.

Show child attributes
beforeExpirystring

The duration before expiry when an announcement should be made. Must be a positive integer followed by one of h (hour), m (minute) or s (second).

whenDeletedboolean

Whether an announcement should be made when this subject is deleted.

requestedAcksobject

Settings to enable at-least-once delivery for policy announcements.

Show child attributes
labelsArray<string>

Acknowledgement labels to request when an announcement is published.

timeoutstring

How long to wait for requested announcements before retrying publication of an announcement.

Example
{
  "labels": [
    "my-connection-id:my-issued-acknowledgement"
  ],
  "timeout": "5s"
}
randomizationIntervalstring5m

Interval in which the announcement can be sent earlier than the configured beforeExpiry. The actual point in time when the announcement will be sent is beforeExpire plus a randomly chosen time within the randomizationInterval. E.g assuming beforeExpiry is set to 5m and randomizationInterval is set to 1m, the announcements will be sent between 5 and 6 minutes before the subject expires. If omitted, the default value will be applied. If set to minimum, no randomization will be applied.

Example
{
  "beforeExpiry": "5m",
  "whenDeleted": true,
  "randomizationInterval": "5m"
}
Example
{
  "type": "This is some description for this subject, adjust as needed.",
  "expiry": "2020-12-07T11:36:40Z",
  "announcement": {
    "beforeExpiry": "5m",
    "whenDeleted": true
  }
}
resourcesResources

(Authorization) Resources containing one ResourceEntry for each type:path key, type being one of the following thing, policy, message.

Show child attributes
[key: string]ResourceEntry

Single (Authorization) Resource entry defining permissions per effect. Allowed effects are grant and revoke.

Show child attributes
grantArray<Permission>READWRITE
revokeArray<Permission>READWRITE
Example
{
  "thing:/": {
    "grant": [
      "READ",
      "WRITE"
    ],
    "revoke": null
  },
  "thing:/attributes/some/path": {
    "grant": null,
    "revoke": [
      "READ"
    ]
  },
  "policy:/": {
    "grant": [
      "READ",
      "WRITE"
    ],
    "revoke": null
  },
  "message:/": {
    "grant": [
      "READ",
      "WRITE"
    ],
    "revoke": null
  }
}
namespacesArray<string>

Restricts this policy entry to things whose namespace matches at least one pattern. If omitted or empty, the entry applies to all namespaces.

  • com.acme matches only that exact namespace
  • com.acme.* matches namespaces below com.acme, but not com.acme itself
Example
[
  "com.acme",
  "com.acme.*"
]
importableImportableimplicitexplicitneverimplicit

Controls the import behavior of this policy entry i.e. whether this policy entry is implicitly, explicitly or never imported when referenced from another policy.

  • implicit (default): the policy entry is imported without being listed in the importing policy individually
  • explicit: the policy entry is only imported if it is listed in the importing policy
  • never: the policy entry is not imported, regardless of being listed in the importing policy If the field is not specified, default value is implicit.
Example
explicit
allowedAdditionsArray<string>subjectsresourcesnamespaces

Defines which types of additions are allowed when this entry is referenced by other entries via references.

Semantics:

  • Field absent (omitted) — no restriction; the referencing entry's own subjects, resources, and namespaces are merged in as usual. This is the upgrade-friendly default.
  • Field present and empty ([]) — no additions allowed; only the referenced entry's content is effective.
  • Field present with values — only the listed kinds of additions survive on the referencing entry.

This field is enforced as a runtime filter, not as a write-time policy contract: a referencing entry that declares own subjects/resources/namespaces not permitted here can still be persisted, but the disallowed own additions are silently stripped at enforcement time. The same filter applies whether the reference is local (within the same policy) or an import reference.

  • subjects — allows referencing entries to add additional subjects on top of this entry
  • resources — allows referencing entries to add additional resources on top of this entry
  • namespaces — allows referencing entries to add additional namespace patterns on top of this entry
Example
[
  "subjects"
]
referencesArray<object>

An optional list of references to other policy entries. Each reference points to an entry either in the same policy (local reference) or in an imported policy (import reference). When set, subjects, resources, and namespaces from the referenced entries are additively merged into this entry.

  • Import reference: contains both entry (the label) and import (the policy ID of the imported policy)
  • Local reference: contains only entry (the label of another entry in the same policy)
Show child attributes

A single reference to a policy entry.

entrystringrequired

The label of the referenced entry.

importstring

The ID of the imported policy this reference points to. If absent, the reference points to a local entry within the same policy.

Single policy entry. Both subjects and resources are optional — they default to empty when absent. An entry may define references to inherit subjects, resources, and namespaces from other entries (local or imported).

Show child attributes
subjectsSubjects

A SubjectEntry defines who is addressed.

Show child attributes
nginx:subjectId1SubjectEntry

Single (Authorization) Subject entry holding its type.

Show child attributes
typestringrequired

The type is offered only for documentation purposes. You are not restricted to any specific types, but we recommend to use it to specify the kind of the subject as shown in our examples.

expirystring<date-time>

The optional expiry timestamp (formatted in ISO-8601) indicates how long this subject should be considered active before it is automatically deleted from the Policy.

Settings for announcements to be made about the subject.

Show child attributes
beforeExpirystring

The duration before expiry when an announcement should be made. Must be a positive integer followed by one of h (hour), m (minute) or s (second).

whenDeletedboolean

Whether an announcement should be made when this subject is deleted.

requestedAcksobject

Settings to enable at-least-once delivery for policy announcements.

Show child attributes
labelsArray<string>

Acknowledgement labels to request when an announcement is published.

timeoutstring

How long to wait for requested announcements before retrying publication of an announcement.

Example
{
  "labels": [
    "my-connection-id:my-issued-acknowledgement"
  ],
  "timeout": "5s"
}
randomizationIntervalstring5m

Interval in which the announcement can be sent earlier than the configured beforeExpiry. The actual point in time when the announcement will be sent is beforeExpire plus a randomly chosen time within the randomizationInterval. E.g assuming beforeExpiry is set to 5m and randomizationInterval is set to 1m, the announcements will be sent between 5 and 6 minutes before the subject expires. If omitted, the default value will be applied. If set to minimum, no randomization will be applied.

Example
{
  "beforeExpiry": "5m",
  "whenDeleted": true,
  "randomizationInterval": "5m"
}
Example
{
  "type": "This is some description for this subject, adjust as needed.",
  "expiry": "2020-12-07T11:36:40Z",
  "announcement": {
    "beforeExpiry": "5m",
    "whenDeleted": true
  }
}
nginx:subjectIdNSubjectEntry

Single (Authorization) Subject entry holding its type.

Show child attributes
typestringrequired

The type is offered only for documentation purposes. You are not restricted to any specific types, but we recommend to use it to specify the kind of the subject as shown in our examples.

expirystring<date-time>

The optional expiry timestamp (formatted in ISO-8601) indicates how long this subject should be considered active before it is automatically deleted from the Policy.

Settings for announcements to be made about the subject.

Show child attributes
beforeExpirystring

The duration before expiry when an announcement should be made. Must be a positive integer followed by one of h (hour), m (minute) or s (second).

whenDeletedboolean

Whether an announcement should be made when this subject is deleted.

requestedAcksobject

Settings to enable at-least-once delivery for policy announcements.

Show child attributes
labelsArray<string>

Acknowledgement labels to request when an announcement is published.

timeoutstring

How long to wait for requested announcements before retrying publication of an announcement.

Example
{
  "labels": [
    "my-connection-id:my-issued-acknowledgement"
  ],
  "timeout": "5s"
}
randomizationIntervalstring5m

Interval in which the announcement can be sent earlier than the configured beforeExpiry. The actual point in time when the announcement will be sent is beforeExpire plus a randomly chosen time within the randomizationInterval. E.g assuming beforeExpiry is set to 5m and randomizationInterval is set to 1m, the announcements will be sent between 5 and 6 minutes before the subject expires. If omitted, the default value will be applied. If set to minimum, no randomization will be applied.

Example
{
  "beforeExpiry": "5m",
  "whenDeleted": true,
  "randomizationInterval": "5m"
}
Example
{
  "type": "This is some description for this subject, adjust as needed.",
  "expiry": "2020-12-07T11:36:40Z",
  "announcement": {
    "beforeExpiry": "5m",
    "whenDeleted": true
  }
}
resourcesResources

(Authorization) Resources containing one ResourceEntry for each type:path key, type being one of the following thing, policy, message.

Show child attributes
[key: string]ResourceEntry

Single (Authorization) Resource entry defining permissions per effect. Allowed effects are grant and revoke.

Show child attributes
grantArray<Permission>READWRITE
revokeArray<Permission>READWRITE
Example
{
  "thing:/": {
    "grant": [
      "READ",
      "WRITE"
    ],
    "revoke": null
  },
  "thing:/attributes/some/path": {
    "grant": null,
    "revoke": [
      "READ"
    ]
  },
  "policy:/": {
    "grant": [
      "READ",
      "WRITE"
    ],
    "revoke": null
  },
  "message:/": {
    "grant": [
      "READ",
      "WRITE"
    ],
    "revoke": null
  }
}
namespacesArray<string>

Restricts this policy entry to things whose namespace matches at least one pattern. If omitted or empty, the entry applies to all namespaces.

  • com.acme matches only that exact namespace
  • com.acme.* matches namespaces below com.acme, but not com.acme itself
Example
[
  "com.acme",
  "com.acme.*"
]
importableImportableimplicitexplicitneverimplicit

Controls the import behavior of this policy entry i.e. whether this policy entry is implicitly, explicitly or never imported when referenced from another policy.

  • implicit (default): the policy entry is imported without being listed in the importing policy individually
  • explicit: the policy entry is only imported if it is listed in the importing policy
  • never: the policy entry is not imported, regardless of being listed in the importing policy If the field is not specified, default value is implicit.
Example
explicit
allowedAdditionsArray<string>subjectsresourcesnamespaces

Defines which types of additions are allowed when this entry is referenced by other entries via references.

Semantics:

  • Field absent (omitted) — no restriction; the referencing entry's own subjects, resources, and namespaces are merged in as usual. This is the upgrade-friendly default.
  • Field present and empty ([]) — no additions allowed; only the referenced entry's content is effective.
  • Field present with values — only the listed kinds of additions survive on the referencing entry.

This field is enforced as a runtime filter, not as a write-time policy contract: a referencing entry that declares own subjects/resources/namespaces not permitted here can still be persisted, but the disallowed own additions are silently stripped at enforcement time. The same filter applies whether the reference is local (within the same policy) or an import reference.

  • subjects — allows referencing entries to add additional subjects on top of this entry
  • resources — allows referencing entries to add additional resources on top of this entry
  • namespaces — allows referencing entries to add additional namespace patterns on top of this entry
Example
[
  "subjects"
]
referencesArray<object>

An optional list of references to other policy entries. Each reference points to an entry either in the same policy (local reference) or in an imported policy (import reference). When set, subjects, resources, and namespaces from the referenced entries are additively merged into this entry.

  • Import reference: contains both entry (the label) and import (the policy ID of the imported policy)
  • Local reference: contains only entry (the label of another entry in the same policy)
Show child attributes

A single reference to a policy entry.

entrystringrequired

The label of the referenced entry.

importstring

The ID of the imported policy this reference points to. If absent, the reference points to a local entry within the same policy.

Policy imports containing one policy import for each key. The key is the policy ID of the referenced policy.

Show child attributes
policyImport1PolicyImport

Single policy import defining which policy entries of the referenced policy are imported.

Show child attributes
entriesArray<string>

The policy entries to import from the referenced policy identified by their labels. In case the field is omitted or an empty array is provided, all policy entries defined as implicit ("importable": "implicit") are imported.

transitiveImportsArray<string>

List of policy IDs from the imported policy's own imports that should be resolved transitively before extracting entries. This enables multi-level import chains where a template policy defines resources and an intermediate policy defines entries with "references" that add local subjects.

Each entry is the policy ID of a policy that the directly imported policy itself imports from. Only the listed policy IDs are resolved — this is an explicit whitelist, not a recursive flag.

Example
[
  "org.eclipse.ditto:policy-template"
]
Example
{
  "entries": [
    "default",
    "import"
  ]
}
policyImportNPolicyImport

Single policy import defining which policy entries of the referenced policy are imported.

Show child attributes
entriesArray<string>

The policy entries to import from the referenced policy identified by their labels. In case the field is omitted or an empty array is provided, all policy entries defined as implicit ("importable": "implicit") are imported.

transitiveImportsArray<string>

List of policy IDs from the imported policy's own imports that should be resolved transitively before extracting entries. This enables multi-level import chains where a template policy defines resources and an intermediate policy defines entries with "references" that add local subjects.

Each entry is the policy ID of a policy that the directly imported policy itself imports from. Only the listed policy IDs are resolved — this is an explicit whitelist, not a recursive flag.

Example
[
  "org.eclipse.ditto:policy-template"
]
Example
{
  "entries": [
    "default",
    "import"
  ]
}
Example
{
  "com.acme:policyId1": {
    "entries": [
      "label1",
      "label2"
    ]
  },
  "com.acme:policyId2": {
    "entries": [
      "import"
    ]
  },
  "com.acme:policyId3": {}
}
_copyPolicyFromstring

This field may contain

  • the policy ID of an existing policy.

    The policy is copied and used for this newly created thing. The caller needs to have READ and WRITE* access to the policy.

  • a placeholder reference to a thing in the format {{ ref:things/[thingId]/policyId }} where you need to replace [thingId] with a valid thing ID.

    The newly created thing will then obtain a copy of the policy of the referenced thing. The caller needs to have READ access to the thing and READ and WRITE* access to the policy of the thing.

* The check for WRITE permission avoids locking yourself out of the newly created policy. You can bypass this check by setting the header allowPolicyLockout to true. Be aware that the authorized subject cannot modify the policy if you do not assign WRITE permission on the policy resource!

If you want to specify a policy ID for the copied policy, use the policyId field.

This field must not be used together with the field _policy. If you specify both _policy and _copyPolicyFrom this will lead to an error response.

policyIdstringrequired

The policy ID used for controlling access to this thing. Managed by resource /policies/{policyId}.

definitionDefinition

A single fully qualified identifier of a definition in the form '::' or a valid HTTP(s) URL

attributesAttributes

An arbitrary JSON object describing the attributes of a thing.

featuresFeatures

List of features where the key represents the featureId of each feature. The featureId key must be unique in the list.

Show child attributes
[key: string]Feature
Show child attributes
definitionArray<string>

The definitions of a feature.

An arbitrary JSON object describing the properties of a feature.

desiredPropertiesFeatureDesiredProperties

An arbitrary JSON object describing the desired properties of a feature.

Parameters

requested-acksstringquery

Contains the "requested acknowledgements" for this modifying request as comma separated list. The HTTP call will block until all requested acknowledgements were aggregated or will time out based on the specified timeout parameter.

The default (if omitted) requested acks is requested-acks=twin-persisted which will block the HTTP call until the change was persited to the twin.

timeoutstringquery

Defines how long the backend should wait for completion of the request, e.g. applied when waiting for requested acknowledgements via the requested-acks param. Can be specified without unit (then seconds are assumed) or together with s, ms or m unit. Example: 42s, 1m.

The default (if omitted) and maximum timeout is 60s. A value of 0 applies fire and forget semantics for the command resulting in setting response-required=false.

response-requiredbooleanquery

Defines whether a response is required to the API call or not - if set to false the response will directly sent back with a status code of 202 (Accepted).

The default (if ommited) response is true.

allow-policy-lockoutbooleanquery

Defines whether a subject is allowed to create a policy without having WRITE permission on the policy resource of the created policy.

The default (if ommited) is false.

namespacestringquery

Defines a custom namespace for the thing while generating a new thing ID.

Response

201CreatedThing

The thing was successfully created.

Response headers
ETagstringheader

The (current server-side) ETag for this (sub-)resource. For top-level resources it is in the format "rev:[revision]", for sub-resources it has the format "hash:[calculated-hash]".

Locationstringheader

The location of the created thing resource

Response fields application/json
thingIdstringrequired

Unique identifier representing the thing

policyIdstringrequired

The ID of the policy which controls the access to this thing. policies are managed by resource /policies/{policyId}

definitionDefinition

A single fully qualified identifier of a definition in the form '::' or a valid HTTP(s) URL

attributesAttributes

An arbitrary JSON object describing the attributes of a thing.

featuresFeatures

List of features where the key represents the featureId of each feature. The featureId key must be unique in the list.

Show child attributes
[key: string]Feature
Show child attributes
definitionArray<string>

The definitions of a feature.

An arbitrary JSON object describing the properties of a feature.

desiredPropertiesFeatureDesiredProperties

An arbitrary JSON object describing the desired properties of a feature.

_revisionstring

(read-only) The revision is a counter which is incremented on each modification of a Thing. This field is not returned by default but must be selected explicitly.

_createdstring

(read-only) The created timestamp of the Thing in ISO-8601 UTC format. The timestamp is set on creation of a Thing. This field is not returned by default but must be selected explicitly.

_modifiedstring

(read-only) The modified timestamp of the Thing in ISO-8601 UTC format. The timestamp is set on each modification of a Thing. This field is not returned by default but must be selected explicitly.

_metadataobject

(read-only) The Metadata of the Thing. This field is not returned by default but must be selected explicitly.

400Bad RequestAdvancedError

The request could not be completed. Possible reasons:

  • the thingId must not be set in the request body
  • the JSON body of the thing to be created is invalid
Response fields application/json
statusintegerrequired

The HTTP status of the error

errorstringrequired

The error code of the occurred exception

messagestringrequired

The message of the error - what went wrong

descriptionstring

A description how to fix the error or more details

hrefstring

A link to further information about the error and how to fix it

401UnauthorizedAdvancedError

The request could not be completed due to missing authentication.

Response fields application/json
statusintegerrequired

The HTTP status of the error

errorstringrequired

The error code of the occurred exception

messagestringrequired

The message of the error - what went wrong

descriptionstring

A description how to fix the error or more details

hrefstring

A link to further information about the error and how to fix it

403ForbiddenAdvancedError

The request could not be completed. Possible reasons:

  • the caller would not have access to the thing after creating it with the given policy.
  • the caller has insufficient permissions.
Response fields application/json
statusintegerrequired

The HTTP status of the error

errorstringrequired

The error code of the occurred exception

messagestringrequired

The message of the error - what went wrong

descriptionstring

A description how to fix the error or more details

hrefstring

A link to further information about the error and how to fix it

404Not FoundAdvancedError

The request could not be completed. Possible reasons:

  • the referenced thing does not exist.
  • the caller had insufficient permissions to read the referenced thing.
  • the policy that should be copied does not exist.
  • the caller had insufficient permissions to read the policy that should be copied.
Response fields application/json
statusintegerrequired

The HTTP status of the error

errorstringrequired

The error code of the occurred exception

messagestringrequired

The message of the error - what went wrong

descriptionstring

A description how to fix the error or more details

hrefstring

A link to further information about the error and how to fix it

412Precondition FailedAdvancedError

A precondition for reading or writing the (sub-)resource failed. This will happen for write requests, if you specified an If-Match or If-None-Match header, which fails the precondition check against the current ETag of the (sub-)resource. For read requests, this error may only happen for a failing If-Match header. In case of a failing If-None-Match header for a read request, status 304 will be returned instead.

Response headers
ETagstringheader

The (current server-side) ETag for this (sub-)resource. For top-level resources it is in the format "rev:[revision]", for sub-resources it has the format "hash:[calculated-hash]".

Response fields application/json
statusintegerrequired

The HTTP status of the error

errorstringrequired

The error code of the occurred exception

messagestringrequired

The message of the error - what went wrong

descriptionstring

A description how to fix the error or more details

hrefstring

A link to further information about the error and how to fix it

413Payload Too LargeAdvancedError

The created or modified entity is larger than the accepted limit of 100 kB.

Response fields application/json
statusintegerrequired

The HTTP status of the error

errorstringrequired

The error code of the occurred exception

messagestringrequired

The message of the error - what went wrong

descriptionstring

A description how to fix the error or more details

hrefstring

A link to further information about the error and how to fix it

424any

One or more acknowledgement requests in the parameter requested-acks were not fulfilled.

Response fields application/json
acknowledgementLabel1any
Show child attributes
statusintegerrequired

The HTTP status of the acknowledgement

payloadobject | string | number | array | boolean

The payload of the acknowledgement

Show child attributes
One of
object
string
number
array
boolean
Example
{
  "status": 200,
  "payload": "OK"
}
Example
{
  "acknowledgementLabel1": {
    "status": 200,
    "payload": "OK"
  },
  "acknnowledgementLabelN": {
    "status": 403,
    "payload": "Forbidden"
  }
}

Authorization

OpenIDConnectopenIdConnect

OpenID Connect Discovery URL. The placeholder is replaced by Swagger UI when configured.

NginxBasichttp (basic)

Eclipse Ditto sandbox demo user (demo1 ... demo9) + password (demo)

Bearerhttp (bearer)

A JSON Web Token issued by a supported OAuth 2.0 Identity Provider.