Amazon Bedrock

import { AwsClient } from 'aws4fetch'

interface Env {
  accessKey: string;
  secretAccessKey: string;
}

export default {
  async fetch(request: Request, env: Env, ctx: ExecutionContext): Promise<Response> {

    // replace with your configuration
    const cfAccountId = "{account_id}";
    const gatewayName = "{gateway_slug}";
    const region = 'us-east-1';

    // added as secrets (https://developers.cloudflare.com/workers/configuration/secrets/)
    const accessKey = env.accessKey;
    const secretKey = env.secretAccessKey;

    const requestData = {
      inputText: "What does ethereal mean?"
    };

    const headers = {
      'Content-Type': 'application/json'
    };

    // sign the original request
    const stockUrl = new URL("https://bedrock-runtime.us-east-1.amazonaws.com/model/amazon.titan-embed-text-v1/invoke")

    const awsClient = new AwsClient({
      accessKeyId: accessKey,
      secretAccessKey: secretKey,
      region: region,
      service: "bedrock"
    });

    const presignedRequest = await awsClient.sign(stockUrl.toString(), {
      method: "POST",
      headers: headers
    });

    // change the signed request's host to AI Gateway
    const stockUrlSigned = new URL(presignedRequest.url);
    stockUrlSigned.host = "gateway.ai.cloudflare.com"
    stockUrlSigned.pathname = `/v1/${cfAccountId}/${gatewayName}/aws-bedrock/bedrock-runtime/${region}/model/amazon.titan-embed-text-v1/invoke`

    // make request
    const response = await fetch(stockUrlSigned, {
      method: 'POST',
      headers: presignedRequest.headers,
      body: JSON.stringify(requestData)
    })

    if (response.ok && response.headers.get('content-type')?.includes('application/json')) {
      const data = await response.json();
      return new Response(JSON.stringify(response));
    } else {
      return new Response("Invalid response", { status: 500 });
    }
  },
};