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[identity] GetSessionInitializationInfo RPC
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Authored by varun on Feb 27 2023, 2:36 PM.
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Details

Summary

clients will call this RPC with a user ID and get in response a map of session initialization info (public keys, social proof, etc.) it needs, keyed by the device's ed25119 signing public key.

adding @ashoat to OK the API design

Test Plan

called this RPC from the keyserver and got back the test data i created in DDB. also tested the failure case with an invalid user ID and got back an exception in JS.

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Event Timeline

services/identity/src/service.rs
286–289 ↗(On Diff #23182)

the DB client gives us back a HashMap<String, HashMap<String, String>>. We need to wrap the inner HashMap in a SessionInitializationInfo struct to satisfy the protobuf definition

shared/protos/identity.proto
88–90 ↗(On Diff #23182)

protobuf doesn't allow defining nested maps inline, but it's happy if we wrap the inner map in a message

varun requested review of this revision.Feb 27 2023, 2:56 PM
ashoat requested changes to this revision.Feb 27 2023, 4:16 PM
ashoat added a subscriber: marcin.
ashoat added inline comments.
shared/protos/identity.proto
89 ↗(On Diff #23182)

Can you add an inline comment explaining what the keys and values are?

I think for the four keys we're starting with, @atul and @marcin have settled on a nested JSON format (see D6822).

Perhaps we could have three keys here:

  1. Nested JSON of all four keys as string
  2. Signature for that string
  3. Social proof, if it exists
196 ↗(On Diff #23182)

Can you add an inline comment explaining what it's keyed on?

This revision now requires changes to proceed.Feb 27 2023, 4:16 PM
This revision is now accepted and ready to land.Feb 27 2023, 7:10 PM
shared/protos/identity.proto
90 ↗(On Diff #23208)

Might be worth explaining that this is where the signing ed25519 key is to be found, and that the signature part refers to primary (not notification)

shared/protos/identity.proto
89 ↗(On Diff #23182)

Really not a fan of having a having a heterogenous collection of values in a hashmap. Would much rather see:

message SessionInitializationInfo {
  string payloadJSON = 1;
  string payloadEd25519Signature = 2;
  optional string socialProof = 3;
}

It helps with compile time checking, bindings, and reasoning about the shape of your data.

Yeah but it makes it much harder whenever we want to change it. Protobufs / gRPC don't handle versioning of schemas very well. @jon, do you have a good story on how we'll handle it if we need to add a new entry?

In general we need to land this ASAP, so would prefer to prioritize finishing up the monthly goal over further discussion here. Maybe we can create a stub task and discuss there once everything is landed?

This revision was automatically updated to reflect the committed changes.