adding array to request header in rhai script

[killjoy2013]

I have a rights claim in my token. array of strings. Trying to add it to request header like this in rhai script;

request.subgraph.headers["rights"] = user.rights;

in the subgraph, when I get the rights from GqlExecutionContext like this;

const ctx = GqlExecutionContext.create(context).getContext();
const rights = ctx.rights;

getting rights as string.

Can I add the array differently in rhai script to get it as string array?

[garypen]

If user.rights is an array, then this will be set as a multi-value header, so that looks correct.

You can do some verification that things are as you expect by following this example:

        let vals = ["a", "b", "c"];
        print(`type of vals: ${vals.type_of()}`); // Use type_of() to verify that vals is an array
        request.subgraph.headers["gary"] = vals; // assigning my array of values to a header called "gary"
        print(`${request.subgraph.headers.values("gary")}`); // printing out all the values of the header "gary"
 
That has output:

2023-02-18T11:59:30.806055Z   INFO [trace_id=213203aa3365ca5cf8e3a2a398bf50f9] type of vals: array
2023-02-18T11:59:30.806405Z   INFO [trace_id=213203aa3365ca5cf8e3a2a398bf50f9] ["a", "b", "c"]

If you verify that you are setting an array and the header definitely contains an array of values, then maybe the issue is not in the router, but in how the GqlExecutionContext is processing the provided headers?

[killjoy2013]

printing like this;

            print(`values of rights: ${user.rights} `);
            print(`type of rights: ${user.rights.type_of()} `);
            
            request.subgraph.headers["rights"] = user.rights;
            
            print(`type of header.rights: ${request.subgraph.headers["rights"].type_of()} `);
            print(`values of header.rights: ${request.subgraph.headers["rights"]} `);

output is;

pollo_router::plugins::rhai: values of rights: ["removeCity", "removeCountry", "countries", "cities"] 
2023-02-18T14:05:23.033801Z apollo-router/src/plugins/rhai.rs:1269  INFO [trace_id=9868721fcd6e10c303990c5af517bc70] apollo_router::plugins::rhai: type of rights: array 
2023-02-18T14:05:23.033893Z apollo-router/src/plugins/rhai.rs:1269  INFO [trace_id=9868721fcd6e10c303990c5af517bc70] apollo_router::plugins::rhai: type of header.rights: string 
2023-02-18T14:05:23.033906Z apollo-router/src/plugins/rhai.rs:1269  INFO [trace_id=9868721fcd6e10c303990c5af517bc70] apollo_router::plugins::rhai: values of header.rights: removeCity 

[garypen]

Note that your code is incorrect. You have to use the values() method to see all the values associated with a multi value header header. That's what I did in my example above. So:

print(`type of header.rights: ${request.subgraph.headers.values("rights").type_of()} `);
print(`values of header.rights: ${request.subgraph.headers.values("rights")} `);

[killjoy2013]

thanks @garypen
when I made the correction you suggest it's looks fine ;

 type of header.rights: array 
values of header.rights: ["removeCity", "removeCountry", "countries", "cities"] 

when I get the rights in subgraph from context on @nestjs/graphql;

    const ctx = GqlExecutionContext.create(context).getContext();
    const rights = ctx.rights;

it strangely displays as string;

'removeCity, removeCountry, countries, cities'