diff --git a/Dockerfile b/Dockerfile new file mode 100644 index 0000000..fd8d05c --- /dev/null +++ b/Dockerfile @@ -0,0 +1,24 @@ +FROM denoland/deno:alpine-1.48.0 + +# Set working directory +WORKDIR /app + +# Copy only necessary files +COPY deno.json . +COPY . . +COPY static/img/ static/img/ + +# Cache dependencies +RUN deno cache app.ts + +# Expose port +EXPOSE 8080 + +# Run as non-root user +RUN adduser -D appuser && chown -R appuser:appuser /app +USER appuser + +# Start application +# Note: Set SERVICE_DOMAIN environment variable to configure your domain +# Example: docker run -e SERVICE_DOMAIN=my-ipv4-service.example.com ... +CMD ["run", "--allow-net", "--allow-read", "src/app.ts"] diff --git a/README.md b/README.md new file mode 100644 index 0000000..7a8712d --- /dev/null +++ b/README.md @@ -0,0 +1,73 @@ +# deno-no-ipv4-here +*Inspired by [ungleich](https://code.ungleich.ch/ungleich-public/ungleich-no-ipv4-here)* + +A simple microservice that responds the following text to all requests + +``` +Sorry, (this part of) domain $domain is not reachable by IPv4. Please upgrade to IPv6 and try to reach $domain again. +``` + +Written for Deno. + +## Configuration + +The application uses the following environment variables: + +- `SERVICE_DOMAIN`: The domain where this service is hosted (default: "localhost") + - Example: `SERVICE_DOMAIN=my-ipv6-service.example.com` + +When making requests to this service, the domain you provide in the `back_to` parameter will be compared against this value to determine if it should be treated as an external domain. + +## Running with Deno + +1. Install Deno: https://deno.land/manual/getting_started/installation +2. Clone this repository: + ```bash + git clone https://git.kyun.li/gunter/ungleich-no-ipv4-here + cd ungleich-no-ipv4-here + ``` +3. Start the service: + ```bash + deno run --allow-net --allow-read app.ts + ``` +4. Set the SERVICE_DOMAIN environment variable for your domain: + ```bash + SERVICE_DOMAIN=your-domain.example.com deno run --allow-net --allow-read app.ts + ``` + +## Running with Docker + +1. Build the Docker image: + ```bash + docker build -t deno-no-ipv4-here . + ``` +2. Run the container with your domain configuration: + ```bash + docker run -e SERVICE_DOMAIN=your-domain.example.com -p 8080:8080 deno-no-ipv4-here + ``` + +## Example Caddy Configuration + +Here's a Caddyfile configuration that redirects all non-configured domains to this service: + +```caddy +# Caddyfile +(your_domain) { + # Your existing configuration for your domain + reverse_proxy localhost:8080 +} + +# Catch-all for all other domains +:80, :443 { + # Redirect to the no-ipv4-here service + redir https://no-ipv4-here.your-domain.example.com?back_to={host} permanent +} +``` + +This configuration: +1. Handles requests for your configured domain normally +2. Redirects all other domains to the no-ipv4-here service +3. Passes the original host as the `back_to` parameter +4. Uses a permanent redirect (HTTP 301) + +Replace `no-ipv4-here.your-domain.example.com` with the domain where you're running this service. diff --git a/app.ts b/app.ts new file mode 100644 index 0000000..475d74e --- /dev/null +++ b/app.ts @@ -0,0 +1,75 @@ +import { Application, Router, type Context, type Next } from "jsr:@oak/oak"; +import { join } from "jsr:@std/path"; +import { Eta } from "jsr:@eta-dev/eta"; + +// Create Eta instance +const eta = new Eta({ + views: join(Deno.cwd(), "src", "views"), + cache: Deno.env.get("DENO_ENV") === "production", +}); + +// Create Oak application +const app = new Application(); +const router = new Router(); + +// Serve static files +app.use(async (ctx: Context, next: Next) => { + const staticPath = join(Deno.cwd(), "src", "static"); + + try { + // Strip /static prefix from path + const path = ctx.request.url.pathname.replace(/^\/static/, ''); + + await ctx.send({ + root: staticPath, + path: path, + index: "index.html", + }); + } catch { + await next(); + } +}); + +// Main route handler +router.get("/", async (ctx: Context) => { + const params = ctx.request.url.searchParams; + let back_to_url = params.get("back_to") || ""; + let domain = ""; + + // If no back_to parameter, check host header + if (!back_to_url) { + const host = ctx.request.headers.get("host") || ""; + const serviceDomain = Deno.env.get("SERVICE_DOMAIN") || "localhost"; + const domainRegex = new RegExp(`^(${serviceDomain.replace(/\./g, '\\.')}|localhost)`); + // Exclude our own hosts + if (host && !domainRegex.test(host)) { + back_to_url = `http://${host}`; + } + } + + // Extract domain from URL + if (back_to_url) { + try { + domain = new URL(back_to_url).hostname; + } catch { + // Invalid URL, ignore + } + } + + // Render template with context + const html = await eta.render("index", { + back_to_url, + domain: domain || "This part of the Internet", + }); + + ctx.response.body = html; + ctx.response.type = "text/html"; +}); + +app.use(router.routes()); +app.use(router.allowedMethods()); + +// Start server +const port = 8080; +console.log(`Server running on http://localhost:${port}`); +await app.listen({ port }); diff --git a/deno.json b/deno.json new file mode 100644 index 0000000..3cbd5ae --- /dev/null +++ b/deno.json @@ -0,0 +1,10 @@ +{ + "imports": { + "oak": "https://deno.land/x/oak@v16.0.0/mod.ts", + "path": "https://deno.land/std@0.224.0/path/mod.ts", + "eta": "https://deno.land/x/eta@v3.1.0/mod.ts" + }, + "tasks": { + "start": "deno run --allow-net --allow-read src/app.ts" + } +} diff --git a/deno.lock b/deno.lock new file mode 100644 index 0000000..4b28d4b --- /dev/null +++ b/deno.lock @@ -0,0 +1,290 @@ +{ + "version": "5", + "specifiers": { + "jsr:@eta-dev/eta@*": "3.5.0", + "jsr:@oak/commons@0.10": "0.10.2", + "jsr:@oak/commons@1": "1.0.0", + "jsr:@oak/oak@*": "17.1.5", + "jsr:@std/assert@0.223": "0.223.0", + "jsr:@std/assert@0.224": "0.224.0", + "jsr:@std/assert@0.226": "0.226.0", + "jsr:@std/assert@1": "1.0.13", + 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+ + + + <%= it.domain ? it.domain + " is not reachable by IPv4" : "This part of the Internet is not reachable by IPv4" %> + + + + + +ipv6onlyhosting-ungleich-deadend + +
+

+ You have reached the end of the IPv4 Internet. + + <% if (it.back_to_url) { %> +
+ The site <%= it.domain %> is not reachable by IPv4. + To access + <%= it.domain %>, + you need to enable IPv6 on your computer. + <% } %> + +
+ Find out + + how to enable IPv6. +
+ <% /* How + to use this service for your IPv6 only service. */ %> +

+
+ + +