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useDataSource

Resolves a manifest dataSource block on a dashboard widget into reactive { data, loading, error, refetch }. Backed by useGraphQL for OpenRegister forms and useBrokeredCall for the brokered (external-provider) form.

Signature​

import { useDataSource, buildCountQuery } from '@conduction/nextcloud-vue'

const { data, loading, error, refetch } = useDataSource(dataSource)

dataSource may be an object, a ref, or a getter function (() => props.dataSource) for reactive inputs. When null/undefined the composable never queries and data.value stays null.

Manifest forms​

Shorthand — { register, schema, filter?, aggregate: 'count' }​

The library builds:

{ <schemaSlug>(filter: <filter>) { totalCount } }

data.value resolves to { count: number }. register is decorative — the GraphQL field name comes from the schema slug.

Raw — { graphql: { query, variables?, selectors } }​

query and variables go straight to useGraphQL. Each entry in selectors runs through selectByPath; data.value is the resulting map keyed by selector keys.

{
  "graphql": {
    "query": "query { meeting { totalCount } }",
    "selectors": { "count": "meeting.totalCount" }
  }
}

Brokered — { broker: { credentialId, provider?, method?, path, query?, headers?, body?, responsePath? } }​

Fetches from an external provider through the OpenRegister credential broker instead of OR GraphQL, so a no-code manifest app renders authenticated third-party API data without ever handling the secret. Routed to useBrokeredCall.

{
  "broker": {
    "credentialId": "5f0e…",
    "provider": "github",
    "method": "GET",
    "path": "/repos/ConductionNL/openregister/issues",
    "query": { "state": "open", "per_page": 20 },
    "responsePath": "0.title"
  }
}

data.value is the parsed upstream body (JSON when it looks like JSON), optionally sliced by responsePath. provider is advisory metadata for the manifest/editor only — the broker resolves the upstream base URL from the credential server-side.

Zero-secret model. The browser never receives the credential. useDataSource POSTs { appId, method, path, headers?, body? } to POST /apps/openregister/api/credentials/{credentialId}/session-request; OpenRegister loads the credential the current user owns, injects the secret server-side, calls the upstream, and returns { status, headers, body }. Failures (403 broker-refused, 502 upstream-unreachable, any non-2xx) resolve into a clean, secret-free error.value.

Requirements.

  • The OpenRegister session-broker endpoint above must be available.
  • The user must own a credential whose allowedApps includes this manifest app id.
  • The manifest app id is taken from options.appId when given, otherwise from the cnAppId value CnAppRoot provides — resolved automatically when useDataSource runs inside a component setup(). Pass useDataSource(ds, { appId }) when calling outside a CnAppRoot tree.

Helpers​

  • buildCountQuery(schemaSlug, filter) — produces the same query string the shorthand uses. Useful when you want the shorthand semantics plus a custom selector key.

Consumed by​

Notes​

  • The shorthand currently only supports aggregate: 'count'. Richer aggregates (groupBy, sum, avg) require the OR backend changes tracked in openregister#1455.