Rest V2 API returns wrong ID for attachment

[Daniel Wendler]

The Atlassian API is returning data like this from the wiki endpoint `/wiki/api/v2/pages/<id>`

{"type":"media","attrs":{"width":1278,"alt":"alt text","id":"51013016-44a8-438f-b0b7-fb619714df9a","collection":"contentId-1180220222","type":"file","height":1500}},

The ID is not requestable from the endpoint `/wiki/api/v2/attachments/<id>`, the format is not UUID but pattern (att)?[0-8]+

See https://developer.atlassian.com/cloud/confluence/rest/v2/api-group-attachment/#api-attachments-id-get

How do I cirumvent this mapping issue?

How do I request the media attachments via the ID in UUIDv4 formt?

There is already an issue up here that mine duplicates, without an answer.

This is very related to the following issue from 2022, but there are only workarounds no solutions..

[Daniel Wendler · Accepted solution]

Getting the `AttachmentSingle` API response object

The endpoint `/wiki/api/v2/attachments/{id}` is broken and doesn't return data, no matter if we use UUIDv4, prefixed, or non-prefixed content-ID.

Instead, I'm using the endpoint `/wiki/api/v2/attachments`, with parameters `limit` => `1` and `filename` => `.attrs.alt`.

The `.downloadLink` property in the resulting ADF works and could also be built manually:

Use the fields `.attrs.alt` as `$filename`, and from the field `.attrs.collection`, strip the prefix (`([a-zA-Z]+-)`) as `$contentId`:

    https://<atlassian-host>/wiki/download/attachments/{$contentId}/{$filename}