commit 7d73f63cd4f6b0d2023939c023d027e27c6abc4c
Author: Emi Simpson <emi@alchemi.dev>
Date:   Mon Nov 8 23:09:57 2021 -0500

    Initial Commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..189288c
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,270 @@
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..fbac180
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "faery-ring"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+tiny_http = "0.9.0"
+argh = "0.1.6"
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..6804657
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,84 @@
+pub mod server;
+
+use std::io::Read;
+use std::process::exit;
+use std::fs::File;
+use std::io::ErrorKind;
+use std::path::PathBuf;
+
+use argh;
+
+fn main() {
+	let args: CommandlineArgs = argh::from_env();
+
+	//
+	// Step 1: Read the file
+	//
+	let mut config = match File::open(&args.domains) {
+		Ok(file) => file,
+		Err(e) => {
+			match e.kind() {
+				ErrorKind::NotFound => {
+					eprintln!("Domains file not found: {}", args.domains.display());
+					exit(1001);
+				},
+				ErrorKind::PermissionDenied => {
+					eprintln!(
+						"Permission denied to read domain file: {}",
+						args.domains.display()
+					);
+					exit(1002);
+				},
+				_ => {
+					eprintln!(
+						"Unexepected error opening domain file: {}",
+						args.domains.display()
+					);
+					exit(1000);
+				}
+			}
+		}
+	};
+	let mut read_into = String::with_capacity(1_000);
+	match config.read_to_string(&mut read_into) {
+		Ok(_) => {},
+		Err(e) => {
+			match e.kind() {
+				ErrorKind::BrokenPipe => {
+					eprintln!("Broken pipe (filesystem error) while reading {}", args.domains.display());
+					exit(1000);
+				},
+				ErrorKind::InvalidData => {
+					eprintln!(
+						"Domain file {} contains non-UTF-8 data.  Are you sure this is a domains file?",
+						args.domains.display()
+					);
+					exit(1003);
+				}
+				_ => {
+					eprintln!(
+						"Unexepected error opening domain file: {}",
+						args.domains.display()
+					);
+					exit(1000);
+				}
+			}
+		}
+	};
+	let domains: Vec<_> = read_into.split('\n')
+		.filter(|s| !s.is_empty())
+		.collect();
+
+	//
+	// Step 2: Run the server
+	//
+	server::go(&domains);
+}
+
+#[derive(argh::FromArgs)]
+/// Run a basic webring hub
+struct CommandlineArgs {
+    /// a text file listing all domains in the ring, one per line
+    #[argh(positional)]
+    domains: PathBuf,
+}
diff --git a/src/server.rs b/src/server.rs
new file mode 100644
index 0000000..5d0c7e8
--- /dev/null
+++ b/src/server.rs
@@ -0,0 +1,114 @@
+use std::borrow::Cow;
+use std::io::Cursor;
+use std::ops::Deref;
+use std::sync::Arc;
+
+use tiny_http::Header;
+use tiny_http::Request;
+use tiny_http::Response;
+use tiny_http::Server;
+use tiny_http::StatusCode;
+
+pub fn go(domains: &[&str]) {
+	let server = Server::http("0.0.0.0:3243").unwrap();
+	let server = Arc::new(server);
+
+	for req in server.incoming_requests() {
+		let route = Route::parse_request(&req);
+		let resp = route.render(domains);
+		if let Err(e) = req.respond(resp) {
+			eprintln!("WARN: {}", e);
+		}
+	}
+}
+
+pub enum Route<'a> {
+	Next(&'a str),
+	Prev(&'a str),
+	NotFound,
+}
+
+pub enum RuntimeStatic {
+	JsonIndex,
+}
+
+impl<'a> Route<'a> {
+	pub fn parse_request(r: &'a Request) -> Self {
+		let segments: Vec<_> = r.url()
+			.split('/')
+			.filter(|s| !s.is_empty())
+			.collect();
+
+		// TODO automatically detect a fallback url from the request's Referer header
+		let referrer_domain = segments.get(1).map(|s| *s).unwrap_or("missing_referrer_domain");
+
+		match segments.get(0).map(Deref::deref) {
+			Some("next") => {
+				Route::Next(referrer_domain)
+			},
+			Some("prev") => {
+				Route::Prev(referrer_domain)
+			},
+			_ => Route::NotFound,
+		}
+	}
+
+	pub fn render<'b>(&self, domains: &[&'b str]) -> Response<Cursor<Cow<'b, [u8]>>> {
+		match self {
+			Self::Next(this_domain) | Self::Prev(this_domain) => {
+
+				let offset: isize = if let Self::Next(_) = self {
+					1
+				} else {
+					-1
+				};
+
+				let destination = domains.iter()
+					.position(|d| this_domain.starts_with(d))
+					.map(|i| (i as isize + offset).rem_euclid(domains.len() as isize))
+					.map(|i| domains[i as usize]);
+
+				if let Some(url) = destination {
+					let destination = format!(
+						"https://{}",
+						url
+					);
+					Response::new(
+						StatusCode(303),
+						vec![
+							Header::from_bytes(
+								b"Location".to_owned(),
+								destination.as_bytes(),
+							).unwrap(),
+						],
+						Cursor::new(Cow::Borrowed(b"")),
+						Some(0),
+						None,
+					)
+				} else {
+					let bytes = format!(
+						"Misconfigured server.  Website {} not found in webring.",
+						this_domain,
+					);
+					let blen = bytes.len();
+					Response::new(
+						StatusCode(400),
+						Vec::new(),
+						Cursor::new(Cow::Owned(bytes.into_bytes())),
+						Some(blen),
+						None,
+					)
+				}
+			},
+			Self::NotFound => {
+				Response::new(
+					StatusCode(404),
+					Vec::new(),
+					Cursor::new(Cow::Borrowed(b"Page not found")),
+					Some(14),
+					None,
+				)
+			}
+		}
+	}
+}