PostGraphile: pgSettings user.id in makeExtendSchemaPlugin - next.js

Question

Is it possible to access pgSettings in a PostGraphile plugin, specifically makeExtendSchema? Here is my middleware:
app.use(
postgraphile(
process.env.DATABASE_URL,
"public",
{
watchPg: true,
classicIds: true,
pgSettings: (req) => {
if (req.headers.cookie) {
const cookies = cookie.parse(req.headers.cookie);
return {
'user.id': cookies['next-auth.session-token']
}
}
return;
},
appendPlugins: [require('./add-cookie-plugin')]
}
)
);
I want a plugin that adds the userId to each mutation, since it's in a cookie and I can't send it in the graphql payload. I saw pg is available, if I wanted an SQL command. Just want to know if the setting is already available:
const { makeExtendSchemaPlugin, gql } = require("graphile-utils");
module.exports = makeExtendSchemaPlugin(build => {
const { pgSql: sql, inflection } = build;
return {
typeDefs: gql`
extend type Query {
userId: Int
}
`,
resolvers: {
Query: {
async userId() {
return // current_setting('user.id', true)
},
},
},
}
});

Answer 1

additionalGraphQLContextFromRequest is great. But I would have to create the entire resolver. Instead I created a custom mutation:
CREATE FUNCTION public.create_row(content text)
RETURNS public.rows
AS $$
INSERT INTO public.rows (user_id, content)
SELECT u.user_id, content FROM users u JOIN sessions s ON u.user_id=s.user_id WHERE s.session_token = current_setting('user.id', true)
RETURNING *;
$$ LANGUAGE sql VOLATILE STRICT;