Authentication and Multi-Tenancy for Pixeltable Apps

Pixeltable Cloud applications should retain their existing authentication systems, using verified user or organization identities on a trusted application server to enforce ownership checks for every upload, search, deletion, media retrieval, and background-job operation. A server-only Pixeltable runtime key authorizes the application to call Cloud services but does not identify end users or automatically provide row-level security, so application code must consistently filter and mutate data by verified tenant identifiers such as user_id or org_id. Private media URLs and job polling require the same authorization boundary because anyone possessing a signed URL can access it until expiration, while browser-provided IDs, tenant fields, object keys, and polling URLs must never be trusted directly. The guidance recommends keeping credentials out of browsers and mobile clients, validating forwarded end-user tokens where needed, using short-lived signed URLs, recording job ownership server-side, applying rate and request-size controls, and testing isolation rigorously with separate users to ensure one tenant cannot access another’s documents, media, or jobs.

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