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getServerConfig.ts

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import { Message } from "rs-core/Message.ts";

import { config, IServerConfig } from "./config.ts";

export const getServerConfig = async (serverConfigLocation: string) => {

if (!serverConfigLocation) throw new Error('Missing server config location');

try {

const serverConfigText = await Deno.readTextFile(serverConfigLocation);

const serverConfig = JSON.parse(serverConfigText) as IServerConfig;

serverConfig.setServerCors = makeServerCorsSetter();

return serverConfig;

} catch (err) {

throw new Error(`Failed to load server config: ${err}`);

}

}

export const makeServerCorsSetter = () => (msg: Message) => {

const origin = msg.getHeader('origin');

if (origin) {

msg.setHeader('Access-Control-Allow-Origin', origin);

const existingVary = (msg.getHeader("Vary") || "")

.split(",")

.map((part) => part.trim())

.filter((part) => !!part);

if (!existingVary.some((part) => part.toLowerCase() === "origin")) {

msg.setHeader("Vary", [ ...existingVary, "Origin" ].join(", "));

}

msg.setHeader(

'Access-Control-Allow-Headers',

'Origin,X-Requested-With,Content-Type,X-Amz-Date,Authorization,X-Api-Key,X-Amz-Security-Token,X-Restspace-Request-Mode'

);

msg.setHeader('Access-Control-Allow-Methods', 'OPTIONS, GET, HEAD, POST, PUT, PATCH, DELETE');

msg.removeHeader('Access-Control-Allow-Credentials');

msg.setHeader('Access-Control-Expose-Headers', 'X-Restspace-Service');

}

return msg;

}