From b3e92ed5e8a77ccc8db61712a3ad805f9d25ced3 Mon Sep 17 00:00:00 2001
From: Marvin Borner
Date: Sun, 23 Oct 2022 13:07:34 +0200
Subject: Initial commit

---
 README.md                   |   16 +
 impl/node/.gitignore        |    1 +
 impl/node/README.md         |    3 +
 impl/node/index.js          |   14 +
 impl/node/package-lock.json | 1018 +++++++++++++++++++++++++++++++++++++++++++
 impl/node/package.json      |   14 +
 public/exec.html            |  105 +++++
 public/index.html           |   25 ++
 8 files changed, 1196 insertions(+)
 create mode 100644 README.md
 create mode 100644 impl/node/.gitignore
 create mode 100644 impl/node/README.md
 create mode 100644 impl/node/index.js
 create mode 100644 impl/node/package-lock.json
 create mode 100644 impl/node/package.json
 create mode 100644 public/exec.html
 create mode 100644 public/index.html

diff --git a/README.md b/README.md
new file mode 100644
index 0000000..327fbfa
--- /dev/null
+++ b/README.md
@@ -0,0 +1,16 @@
+# Redireculus
+
+Brainfuck interpreter (ab)using browser redirects and path-specific
+cookies.
+
+## Structure
+
+-   `impl/`: several simple hosting implementations
+-   `public/`: the actual code
+
+## Usage
+
+0.  run according to `impl/*` instructions
+1.  (clear cookies)
+2.  enter brainfuck code
+3.  enjoy
diff --git a/impl/node/.gitignore b/impl/node/.gitignore
new file mode 100644
index 0000000..c2658d7
--- /dev/null
+++ b/impl/node/.gitignore
@@ -0,0 +1 @@
+node_modules/
diff --git a/impl/node/README.md b/impl/node/README.md
new file mode 100644
index 0000000..b36d48b
--- /dev/null
+++ b/impl/node/README.md
@@ -0,0 +1,3 @@
+0.  `npm i`
+1.  `node index`
+2.  `firefox localhost:3000`
diff --git a/impl/node/index.js b/impl/node/index.js
new file mode 100644
index 0000000..a0a09cd
--- /dev/null
+++ b/impl/node/index.js
@@ -0,0 +1,14 @@
+const express = require('express')
+const app = express()
+const path = require
+const static = __dirname + '/../../public'
+app.use(express.static(static))
+const port = 3000
+
+app.get('/:addr(-?\\d+)', (req, res) => {
+	res.sendFile(path.resolve(static + '/exec.html'))
+})
+
+app.listen(port, () => {
+	console.log(`listening on ${port}`)
+})
diff --git a/impl/node/package-lock.json b/impl/node/package-lock.json
new file mode 100644
index 0000000..6aba0e1
--- /dev/null
+++ b/impl/node/package-lock.json
@@ -0,0 +1,1018 @@
+{
+  "name": "redireculus",
+  "version": "1.0.0",
+  "lockfileVersion": 2,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "redireculus",
+      "version": "1.0.0",
+      "license": "MIT",
+      "dependencies": {
+        "express": "^4.18.2"
+      }
+    },
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+        "negotiator": "0.6.3"
+      },
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+      }
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+        "forwarded": "0.2.0",
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+      }
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+    "qs": {
+      "version": "6.11.0",
+      "resolved": "https://registry.npmjs.org/qs/-/qs-6.11.0.tgz",
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+      }
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+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/range-parser/-/range-parser-1.2.1.tgz",
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+      "resolved": "https://registry.npmjs.org/raw-body/-/raw-body-2.5.1.tgz",
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+      "requires": {
+        "bytes": "3.1.2",
+        "http-errors": "2.0.0",
+        "iconv-lite": "0.4.24",
+        "unpipe": "1.0.0"
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+      "version": "5.2.1",
+      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
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+      "resolved": "https://registry.npmjs.org/send/-/send-0.18.0.tgz",
+      "integrity": "sha512-qqWzuOjSFOuqPjFe4NOsMLafToQQwBSOEpS+FwEt3A2V3vKubTquT3vmLTQpFgMXp8AlFWFuP1qKaJZOtPpVXg==",
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+        "debug": "2.6.9",
+        "depd": "2.0.0",
+        "destroy": "1.2.0",
+        "encodeurl": "~1.0.2",
+        "escape-html": "~1.0.3",
+        "etag": "~1.8.1",
+        "fresh": "0.5.2",
+        "http-errors": "2.0.0",
+        "mime": "1.6.0",
+        "ms": "2.1.3",
+        "on-finished": "2.4.1",
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+        "call-bind": "^1.0.0",
+        "get-intrinsic": "^1.0.2",
+        "object-inspect": "^1.9.0"
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+      "resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.1.tgz",
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+    },
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+      "version": "1.6.18",
+      "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.18.tgz",
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+      "requires": {
+        "media-typer": "0.3.0",
+        "mime-types": "~2.1.24"
+      }
+    },
+    "unpipe": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
+      "integrity": "sha512-pjy2bYhSsufwWlKwPc+l3cN7+wuJlK6uz0YdJEOlQDbl6jo/YlPi4mb8agUkVC8BF7V8NuzeyPNqRksA3hztKQ=="
+    },
+    "utils-merge": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
+      "integrity": "sha512-pMZTvIkT1d+TFGvDOqodOclx0QWkkgi6Tdoa8gC8ffGAAqz9pzPTZWAybbsHHoED/ztMtkv/VoYTYyShUn81hA=="
+    },
+    "vary": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg=="
+    }
+  }
+}
diff --git a/impl/node/package.json b/impl/node/package.json
new file mode 100644
index 0000000..d1235b6
--- /dev/null
+++ b/impl/node/package.json
@@ -0,0 +1,14 @@
+{
+  "name": "redireculus",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "Marvin Borner",
+  "license": "MIT",
+  "dependencies": {
+    "express": "^4.18.2"
+  }
+}
diff --git a/public/exec.html b/public/exec.html
new file mode 100644
index 0000000..6d67d05
--- /dev/null
+++ b/public/exec.html
@@ -0,0 +1,105 @@
+<!DOCTYPE html>
+<html>
+	<head>
+		<meta charset="UTF-8" />
+		<meta name="viewport" content="width=device-width" />
+		<title>exec</title>
+	</head>
+	<body>
+		<div style="width: 100%; text-align: center">
+			<span id="current" style="font-size: 80vh"></span>
+			<span id="raw"></span>
+			<br>
+			<span id="ascii"></span>
+		</div>
+		<script charset="utf-8">
+			const getCookieValue = name => document.cookie.match('(^|;)\\s*' + name + '\\s*=\\s*([^;]+)')?.pop() || ''
+			const current = document.getElementById("current")
+			const raw = document.getElementById("raw")
+			const ascii = document.getElementById("ascii")
+			const code = getCookieValue("code")
+			const ptr = +getCookieValue("ptr")
+			let addr = +document.location.pathname.substring(1)
+
+			const cell = new Uint8Array(1)
+			cell[0] = +getCookieValue("cell")
+
+			if (ptr >= code.length) {
+				alert("finished")
+				out = JSON.parse(getCookieValue("out"))
+				current.style.display = "none"
+				raw.innerText = out.join(", ")
+				ascii.innerText = out.map(x => String.fromCharCode(x)).join("")
+				throw new Error("byeee")
+			}
+
+			const lnext = () => {
+				let parity = 0
+				for (let i = ptr + 1; i < code.length; i++) {
+					if (parity == 0 && code[i] == ']') return i
+					else if (code[i] == ']') parity--
+					else if (code[i] == '[') parity++
+				}
+				alert("invalid code")
+				throw new Error("invalid code")
+			}
+
+			const lprev = () => {
+				let parity = 0
+				for (let i = ptr - 1; i >= 0; i--) {
+					if (parity == 0 && code[i] == '[') return i
+					else if (code[i] == '[') parity--
+					else if (code[i] == ']') parity++
+				}
+				alert("invalid code")
+				throw new Error("invalid code")
+			}
+
+			const exec = code[ptr]
+			current.innerText = exec;
+			switch(exec) {
+				case '>':
+					document.cookie = `ptr=${ptr+1}`
+					addr++
+					break
+				case '<':
+					document.cookie = `ptr=${ptr+1}`
+					addr--
+					break
+				case '+':
+					document.cookie = `ptr=${ptr+1}`
+					cell[0] += 1
+					document.cookie = `cell=${cell[0]}; path=/${addr}`
+					break
+				case '-':
+					document.cookie = `ptr=${ptr+1}`
+					cell[0] -= 1
+					document.cookie = `cell=${cell[0]}; path=/${addr}`
+					break
+				case '.':
+					document.cookie = `ptr=${ptr+1}`
+					const out = JSON.parse(getCookieValue("out"))
+					out.push(cell[0])
+					document.cookie = `out=${JSON.stringify(out)}; path=/`
+					break
+				case ',':
+					document.cookie = `ptr=${ptr+1}`
+					// TODO
+					const inp = "42"
+					document.cookie = `cell=${inp}; path=/${addr}`
+					break
+				case '[':
+					document.cookie = `ptr=${cell[0] == 0 ? lnext() + 1 : ptr + 1}`
+					break
+				case ']':
+					document.cookie = `ptr=${cell[0] != 0 ? lprev() + 1 : ptr + 1}`
+					break
+				default:
+					alert("invalid code")
+					throw new Error("invalid code")
+			}
+
+			window.location.replace(`/${addr}`)
+		</script>
+	</body>
+</html>
diff --git a/public/index.html b/public/index.html
new file mode 100644
index 0000000..00ad5fa
--- /dev/null
+++ b/public/index.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<html>
+	<head>
+		<meta charset="UTF-8" />
+		<meta name="viewport" content="width=device-width" />
+		<title>input</title>
+	</head>
+	<body>
+		<input type="text" placeholder="your program" value="++++++++[>++++[>++>+++>+++>+<<<<-]>+>+>->>+[<]<-]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------.>>+.>++." id="input" />
+		<input type="number" value="300" id="timeout" />
+		<input type="button" value="go" id="button" />
+		<script charset="utf-8">
+			const but = document.getElementById("button")
+			const inp = document.getElementById("input")
+			but.addEventListener("click", () => {
+				const timeout = +document.getElementById("timeout").value
+				// JS cookie assignment be weird af
+				document.cookie = `code=${inp.value}; max-age=${timeout}; path=/`
+				document.cookie = `ptr=0; max-age=${timeout}; path=/`
+				document.cookie = `out=[]; max-age=${timeout}; path=/`
+				window.location.replace("/0")
+			})
+		</script>
+	</body>
+</html>
-- 
cgit v1.2.3