Initial commit

Author: Skaldebane

.prettierrc

@@ -1,6 +1,7 @@
 {
 	"printWidth": 140,
-	"singleQuote": true,
+	"singleQuote": false,
 	"semi": true,
-	"useTabs": true
+	"useTabs": false,
+	"tabWidth": 4
 }

README.md

@@ -0,0 +1,11 @@
+# Gemini Proxy on a Cloudflare Worker
+
+This is an attempt to build a barebones HTTP-Gemini proxy on Cloudflare Workers.
+
+The implementation is mostly complete (aside from support for client certificates),
+but it's currently broken as there's no way to accept arbitrary self-signed certificates
+in Workers for now.
+
+Trying to use `NODE_TLS_REJECT_UNAUTHORIZED = 0` does not work either.
+
+I've opened an feature request for allowing unauthorized certificates here: [cloudflare/workers-sdk #6503](https://github.com/cloudflare/workers-sdk/issues/6503).

src/index.ts

@@ -1,18 +1,30 @@
-/**
- * Welcome to Cloudflare Workers! This is your first worker.
- *
- * - Run `npm run dev` in your terminal to start a development server
- * - Open a browser tab at http://localhost:8787/ to see your worker in action
- * - Run `npm run deploy` to publish your worker
- *
- * Bind resources to your worker in `wrangler.toml`. After adding bindings, a type definition for the
- * `Env` object can be regenerated with `npm run cf-typegen`.
- *
- * Learn more at https://developers.cloudflare.com/workers/
- */
+import { connect } from "cloudflare:sockets";
 
 export default {
-	async fetch(request, env, ctx): Promise<Response> {
-		return new Response('Hello World!');
-	},
+    async fetch(request): Promise<Response> {
+        try {
+            const address = new URL(request.url).pathname.substring(1);
+            const url = new URL(address);
+            url.port = url.port.length == 0 ? "1965" : url.port;
+
+            const socketAddress: SocketAddress = {
+                hostname: url.hostname,
+                port: Number(url.port),
+            };
+            const socketOptions: SocketOptions = {
+                secureTransport: "starttls",
+                allowHalfOpen: false
+            };
+            const socket = connect(socketAddress, socketOptions).startTls();
+
+            const writer = socket.writable.getWriter();
+            const encoder = new TextEncoder();
+            const encoded = encoder.encode(`${url.pathname}\r\n`);
+            await writer.write(encoded);
+
+            return new Response(socket.readable, { headers: { "Content-Type": "text/plain" } });
+        } catch (error) {
+            return new Response("Socket connection failed: " + error, { status: 500 });
+        }
+    },
 } satisfies ExportedHandler<Env>;

wrangler.toml

@@ -4,105 +4,8 @@ main = "src/index.ts"
 compatibility_date = "2024-08-06"
 compatibility_flags = ["nodejs_compat"]
 
-# Automatically place your workloads in an optimal location to minimize latency.
-# If you are running back-end logic in a Worker, running it closer to your back-end infrastructure
-# rather than the end user may result in better performance.
-# Docs: https://developers.cloudflare.com/workers/configuration/smart-placement/#smart-placement
-# [placement]
-# mode = "smart"
+[placement]
+mode = "smart"
 
-# Variable bindings. These are arbitrary, plaintext strings (similar to environment variables)
-# Docs:
-# - https://developers.cloudflare.com/workers/wrangler/configuration/#environment-variables
-# Note: Use secrets to store sensitive data.
-# - https://developers.cloudflare.com/workers/configuration/secrets/
-# [vars]
-# MY_VARIABLE = "production_value"
-
-# Bind the Workers AI model catalog. Run machine learning models, powered by serverless GPUs, on Cloudflare’s global network
-# Docs: https://developers.cloudflare.com/workers/wrangler/configuration/#workers-ai
-# [ai]
-# binding = "AI"
-
-# Bind an Analytics Engine dataset. Use Analytics Engine to write analytics within your Pages Function.
-# Docs: https://developers.cloudflare.com/workers/wrangler/configuration/#analytics-engine-datasets
-# [[analytics_engine_datasets]]
-# binding = "MY_DATASET"
-
-# Bind a headless browser instance running on Cloudflare's global network.
-# Docs: https://developers.cloudflare.com/workers/wrangler/configuration/#browser-rendering
-# [browser]
-# binding = "MY_BROWSER"
-
-# Bind a D1 database. D1 is Cloudflare’s native serverless SQL database.
-# Docs: https://developers.cloudflare.com/workers/wrangler/configuration/#d1-databases
-# [[d1_databases]]
-# binding = "MY_DB"
-# database_name = "my-database"
-# database_id = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
-
-# Bind a dispatch namespace. Use Workers for Platforms to deploy serverless functions programmatically on behalf of your customers.
-# Docs: https://developers.cloudflare.com/workers/wrangler/configuration/#dispatch-namespace-bindings-workers-for-platforms
-# [[dispatch_namespaces]]
-# binding = "MY_DISPATCHER"
-# namespace = "my-namespace"
-
-# Bind a Durable Object. Durable objects are a scale-to-zero compute primitive based on the actor model.
-# Durable Objects can live for as long as needed. Use these when you need a long-running "server", such as in realtime apps.
-# Docs: https://developers.cloudflare.com/workers/wrangler/configuration/#durable-objects
-# [[durable_objects.bindings]]
-# name = "MY_DURABLE_OBJECT"
-# class_name = "MyDurableObject"
-
-# Durable Object migrations.
-# Docs: https://developers.cloudflare.com/workers/wrangler/configuration/#migrations
-# [[migrations]]
-# tag = "v1"
-# new_classes = ["MyDurableObject"]
-
-# Bind a Hyperdrive configuration. Use to accelerate access to your existing databases from Cloudflare Workers.
-# Docs: https://developers.cloudflare.com/workers/wrangler/configuration/#hyperdrive
-# [[hyperdrive]]
-# binding = "MY_HYPERDRIVE"
-# id = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
-
-# Bind a KV Namespace. Use KV as persistent storage for small key-value pairs.
-# Docs: https://developers.cloudflare.com/workers/wrangler/configuration/#kv-namespaces
-# [[kv_namespaces]]
-# binding = "MY_KV_NAMESPACE"
-# id = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
-
-# Bind an mTLS certificate. Use to present a client certificate when communicating with another service.
-# Docs: https://developers.cloudflare.com/workers/wrangler/configuration/#mtls-certificates
-# [[mtls_certificates]]
-# binding = "MY_CERTIFICATE"
-# certificate_id = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
-
-# Bind a Queue producer. Use this binding to schedule an arbitrary task that may be processed later by a Queue consumer.
-# Docs: https://developers.cloudflare.com/workers/wrangler/configuration/#queues
-# [[queues.producers]]
-# binding = "MY_QUEUE"
-# queue = "my-queue"
-
-# Bind a Queue consumer. Queue Consumers can retrieve tasks scheduled by Producers to act on them.
-# Docs: https://developers.cloudflare.com/workers/wrangler/configuration/#queues
-# [[queues.consumers]]
-# queue = "my-queue"
-
-# Bind an R2 Bucket. Use R2 to store arbitrarily large blobs of data, such as files.
-# Docs: https://developers.cloudflare.com/workers/wrangler/configuration/#r2-buckets
-# [[r2_buckets]]
-# binding = "MY_BUCKET"
-# bucket_name = "my-bucket"
-
-# Bind another Worker service. Use this binding to call another Worker without network overhead.
-# Docs: https://developers.cloudflare.com/workers/wrangler/configuration/#service-bindings
-# [[services]]
-# binding = "MY_SERVICE"
-# service = "my-service"
-
-# Bind a Vectorize index. Use to store and query vector embeddings for semantic search, classification and other vector search use-cases.
-# Docs: https://developers.cloudflare.com/workers/wrangler/configuration/#vectorize-indexes
-# [[vectorize]]
-# binding = "MY_INDEX"
-# index_name = "my-index"
+[vars]
+NODE_TLS_REJECT_UNAUTHORIZED = 0