From e06ec920f7a5d784e674c4c4b4e6d1da3dc7391d Mon Sep 17 00:00:00 2001
From: Piotr Russ <mail@pruss.it>
Date: Mon, 16 Nov 2020 00:10:28 +0100
Subject: api, login, auth

---
 node_modules/saslprep/index.js | 157 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 157 insertions(+)
 create mode 100644 node_modules/saslprep/index.js

(limited to 'node_modules/saslprep/index.js')

diff --git a/node_modules/saslprep/index.js b/node_modules/saslprep/index.js
new file mode 100644
index 0000000..21bb0fe
--- /dev/null
+++ b/node_modules/saslprep/index.js
@@ -0,0 +1,157 @@
+'use strict';
+
+const {
+  unassigned_code_points,
+  commonly_mapped_to_nothing,
+  non_ASCII_space_characters,
+  prohibited_characters,
+  bidirectional_r_al,
+  bidirectional_l,
+} = require('./lib/memory-code-points');
+
+module.exports = saslprep;
+
+// 2.1.  Mapping
+
+/**
+ * non-ASCII space characters [StringPrep, C.1.2] that can be
+ * mapped to SPACE (U+0020)
+ */
+const mapping2space = non_ASCII_space_characters;
+
+/**
+ * the "commonly mapped to nothing" characters [StringPrep, B.1]
+ * that can be mapped to nothing.
+ */
+const mapping2nothing = commonly_mapped_to_nothing;
+
+// utils
+const getCodePoint = character => character.codePointAt(0);
+const first = x => x[0];
+const last = x => x[x.length - 1];
+
+/**
+ * Convert provided string into an array of Unicode Code Points.
+ * Based on https://stackoverflow.com/a/21409165/1556249
+ * and https://www.npmjs.com/package/code-point-at.
+ * @param {string} input
+ * @returns {number[]}
+ */
+function toCodePoints(input) {
+  const codepoints = [];
+  const size = input.length;
+
+  for (let i = 0; i < size; i += 1) {
+    const before = input.charCodeAt(i);
+
+    if (before >= 0xd800 && before <= 0xdbff && size > i + 1) {
+      const next = input.charCodeAt(i + 1);
+
+      if (next >= 0xdc00 && next <= 0xdfff) {
+        codepoints.push((before - 0xd800) * 0x400 + next - 0xdc00 + 0x10000);
+        i += 1;
+        continue;
+      }
+    }
+
+    codepoints.push(before);
+  }
+
+  return codepoints;
+}
+
+/**
+ * SASLprep.
+ * @param {string} input
+ * @param {Object} opts
+ * @param {boolean} opts.allowUnassigned
+ * @returns {string}
+ */
+function saslprep(input, opts = {}) {
+  if (typeof input !== 'string') {
+    throw new TypeError('Expected string.');
+  }
+
+  if (input.length === 0) {
+    return '';
+  }
+
+  // 1. Map
+  const mapped_input = toCodePoints(input)
+    // 1.1 mapping to space
+    .map(character => (mapping2space.get(character) ? 0x20 : character))
+    // 1.2 mapping to nothing
+    .filter(character => !mapping2nothing.get(character));
+
+  // 2. Normalize
+  const normalized_input = String.fromCodePoint
+    .apply(null, mapped_input)
+    .normalize('NFKC');
+
+  const normalized_map = toCodePoints(normalized_input);
+
+  // 3. Prohibit
+  const hasProhibited = normalized_map.some(character =>
+    prohibited_characters.get(character)
+  );
+
+  if (hasProhibited) {
+    throw new Error(
+      'Prohibited character, see https://tools.ietf.org/html/rfc4013#section-2.3'
+    );
+  }
+
+  // Unassigned Code Points
+  if (opts.allowUnassigned !== true) {
+    const hasUnassigned = normalized_map.some(character =>
+      unassigned_code_points.get(character)
+    );
+
+    if (hasUnassigned) {
+      throw new Error(
+        'Unassigned code point, see https://tools.ietf.org/html/rfc4013#section-2.5'
+      );
+    }
+  }
+
+  // 4. check bidi
+
+  const hasBidiRAL = normalized_map.some(character =>
+    bidirectional_r_al.get(character)
+  );
+
+  const hasBidiL = normalized_map.some(character =>
+    bidirectional_l.get(character)
+  );
+
+  // 4.1 If a string contains any RandALCat character, the string MUST NOT
+  // contain any LCat character.
+  if (hasBidiRAL && hasBidiL) {
+    throw new Error(
+      'String must not contain RandALCat and LCat at the same time,' +
+        ' see https://tools.ietf.org/html/rfc3454#section-6'
+    );
+  }
+
+  /**
+   * 4.2 If a string contains any RandALCat character, a RandALCat
+   * character MUST be the first character of the string, and a
+   * RandALCat character MUST be the last character of the string.
+   */
+
+  const isFirstBidiRAL = bidirectional_r_al.get(
+    getCodePoint(first(normalized_input))
+  );
+  const isLastBidiRAL = bidirectional_r_al.get(
+    getCodePoint(last(normalized_input))
+  );
+
+  if (hasBidiRAL && !(isFirstBidiRAL && isLastBidiRAL)) {
+    throw new Error(
+      'Bidirectional RandALCat character must be the first and the last' +
+        ' character of the string, see https://tools.ietf.org/html/rfc3454#section-6'
+    );
+  }
+
+  return normalized_input;
+}
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