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20 lines
1.3 KiB
Markdown
20 lines
1.3 KiB
Markdown
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## Key Server
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This is an internal component which manages E2E keys from clients. It handles all the [Key Management APIs](https://matrix.org/docs/spec/client_server/r0.6.1#key-management-api) with the exception of `/keys/changes` which is handled by Sync API. This component is designed to shard by user ID.
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Keys are uploaded and stored in this component, and key changes are emitted to a Kafka topic for downstream components such as Sync API.
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### Internal APIs
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- `PerformUploadKeys` stores identity keys and one-time public keys for given user(s).
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- `PerformClaimKeys` acquires one-time public keys for given user(s). This may involve outbound federation calls.
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- `QueryKeys` returns identity keys for given user(s). This may involve outbound federation calls. This component may then cache federated identity keys to avoid repeatedly hitting remote servers.
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- A topic which emits identity keys every time there is a change (addition or deletion).
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### Endpoint mappings
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- Client API maps `/keys/upload` to `PerformUploadKeys`.
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- Client API maps `/keys/query` to `QueryKeys`.
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- Client API maps `/keys/claim` to `PerformClaimKeys`.
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- Federation API maps `/user/keys/query` to `QueryKeys`.
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- Federation API maps `/user/keys/claim` to `PerformClaimKeys`.
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- Sync API maps `/keys/changes` to consuming from the Kafka topic.
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