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frames.ts
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frames.ts
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"use server";
import {getSSLHubRpcClient, Message} from "@farcaster/hub-nodejs";
const HUB_URL = process.env["HUB_URL"];
const client = HUB_URL ? getSSLHubRpcClient(HUB_URL) : undefined;
type FrameContext = {
buttonIndex: number;
fid: number;
}
export async function parseFramePayload(payload: any): Promise<FrameContext> {
let validatedMessage : Message | undefined = undefined;
try {
const frameMessage = Message.decode(Buffer.from(payload?.trustedData?.messageBytes || "", "hex"));
const result = await client?.validateMessage(frameMessage);
if (result && result.isOk() && result.value.valid) {
validatedMessage = result.value.message;
}
let urlBuffer = validatedMessage?.data?.frameActionBody?.url || [];
const urlString = Buffer.from(urlBuffer).toString("utf-8");
if (validatedMessage && !urlString.startsWith(process.env["HOST"] || "")) {
throw new Error(`Invalid frame url: ${urlBuffer}`);
}
} catch (e) {
throw new Error(`Failed to validate message: ${e}`);
}
let buttonId = 0, fid = 0;
if (client) {
buttonId = validatedMessage?.data?.frameActionBody?.buttonIndex || 0;
fid = validatedMessage?.data?.fid || 0;
} else {
buttonId = payload?.untrustedData?.buttonIndex || 0;
fid = payload?.untrustedData?.fid || 0;
}
return {buttonIndex: buttonId, fid: fid};
}