1 files changed, 517 insertions, 0 deletions
diff --git a/ext/node/polyfills/querystring.ts b/ext/node/polyfills/querystring.ts
new file mode 100644
index 000000000..d8fdfbcc8
--- /dev/null
+++ b/ext/node/polyfills/querystring.ts
@@ -0,0 +1,517 @@
+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+import { Buffer } from "internal:deno_node/polyfills/buffer.ts";
+import {
+  encodeStr,
+  hexTable,
+} from "internal:deno_node/polyfills/internal/querystring.ts";
+
+/**
+ * Alias of querystring.parse()
+ * @legacy
+ */
+export const decode = parse;
+
+/**
+ * Alias of querystring.stringify()
+ * @legacy
+ */
+export const encode = stringify;
+
+/**
+ * replaces encodeURIComponent()
+ * @see https://www.ecma-international.org/ecma-262/5.1/#sec-15.1.3.4
+ */
+function qsEscape(str: unknown): string {
+  if (typeof str !== "string") {
+    if (typeof str === "object") {
+      str = String(str);
+    } else {
+      str += "";
+    }
+  }
+  return encodeStr(str as string, noEscape, hexTable);
+}
+
+/**
+ * Performs URL percent-encoding on the given `str` in a manner that is optimized for the specific requirements of URL query strings.
+ * Used by `querystring.stringify()` and is generally not expected to be used directly.
+ * It is exported primarily to allow application code to provide a replacement percent-encoding implementation if necessary by assigning `querystring.escape` to an alternative function.
+ * @legacy
+ * @see Tested in `test-querystring-escape.js`
+ */
+export const escape = qsEscape;
+
+export interface ParsedUrlQuery {
+  [key: string]: string | string[] | undefined;
+}
+
+export interface ParsedUrlQueryInput {
+  [key: string]:
+    | string
+    | number
+    | boolean
+    | ReadonlyArray<string>
+    | ReadonlyArray<number>
+    | ReadonlyArray<boolean>
+    | null
+    | undefined;
+}
+
+interface ParseOptions {
+  /** The function to use when decoding percent-encoded characters in the query string. */
+  decodeURIComponent?: (string: string) => string;
+  /** Specifies the maximum number of keys to parse. */
+  maxKeys?: number;
+}
+
+// deno-fmt-ignore
+const isHexTable = new Int8Array([
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0 - 15
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 16 - 31
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 32 - 47
+  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, // 48 - 63
+  0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 64 - 79
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 80 - 95
+  0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 96 - 111
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 112 - 127
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 128 ...
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  // ... 256
+]);
+
+function charCodes(str: string): number[] {
+  const ret = new Array(str.length);
+  for (let i = 0; i < str.length; ++i) {
+    ret[i] = str.charCodeAt(i);
+  }
+  return ret;
+}
+
+function addKeyVal(
+  obj: ParsedUrlQuery,
+  key: string,
+  value: string,
+  keyEncoded: boolean,
+  valEncoded: boolean,
+  decode: (encodedURIComponent: string) => string,
+) {
+  if (key.length > 0 && keyEncoded) {
+    key = decode(key);
+  }
+  if (value.length > 0 && valEncoded) {
+    value = decode(value);
+  }
+
+  if (obj[key] === undefined) {
+    obj[key] = value;
+  } else {
+    const curValue = obj[key];
+    // A simple Array-specific property check is enough here to
+    // distinguish from a string value and is faster and still safe
+    // since we are generating all of the values being assigned.
+    if ((curValue as string[]).pop) {
+      (curValue as string[])[curValue!.length] = value;
+    } else {
+      obj[key] = [curValue as string, value];
+    }
+  }
+}
+
+/**
+ * Parses a URL query string into a collection of key and value pairs.
+ * @param str The URL query string to parse
+ * @param sep The substring used to delimit key and value pairs in the query string. Default: '&'.
+ * @param eq The substring used to delimit keys and values in the query string. Default: '='.
+ * @param options The parse options
+ * @param options.decodeURIComponent The function to use when decoding percent-encoded characters in the query string. Default: `querystring.unescape()`.
+ * @param options.maxKeys Specifies the maximum number of keys to parse. Specify `0` to remove key counting limitations. Default: `1000`.
+ * @legacy
+ * @see Tested in test-querystring.js
+ */
+export function parse(
+  str: string,
+  sep = "&",
+  eq = "=",
+  { decodeURIComponent = unescape, maxKeys = 1000 }: ParseOptions = {},
+): ParsedUrlQuery {
+  const obj: ParsedUrlQuery = Object.create(null);
+
+  if (typeof str !== "string" || str.length === 0) {
+    return obj;
+  }
+
+  const sepCodes = !sep ? [38] /* & */ : charCodes(String(sep));
+  const eqCodes = !eq ? [61] /* = */ : charCodes(String(eq));
+  const sepLen = sepCodes.length;
+  const eqLen = eqCodes.length;
+
+  let pairs = 1000;
+  if (typeof maxKeys === "number") {
+    // -1 is used in place of a value like Infinity for meaning
+    // "unlimited pairs" because of additional checks V8 (at least as of v5.4)
+    // has to do when using variables that contain values like Infinity. Since
+    // `pairs` is always decremented and checked explicitly for 0, -1 works
+    // effectively the same as Infinity, while providing a significant
+    // performance boost.
+    pairs = maxKeys > 0 ? maxKeys : -1;
+  }
+
+  let decode = unescape;
+  if (decodeURIComponent) {
+    decode = decodeURIComponent;
+  }
+  const customDecode = decode !== unescape;
+
+  let lastPos = 0;
+  let sepIdx = 0;
+  let eqIdx = 0;
+  let key = "";
+  let value = "";
+  let keyEncoded = customDecode;
+  let valEncoded = customDecode;
+  const plusChar = customDecode ? "%20" : " ";
+  let encodeCheck = 0;
+  for (let i = 0; i < str.length; ++i) {
+    const code = str.charCodeAt(i);
+
+    // Try matching key/value pair separator (e.g. '&')
+    if (code === sepCodes[sepIdx]) {
+      if (++sepIdx === sepLen) {
+        // Key/value pair separator match!
+        const end = i - sepIdx + 1;
+        if (eqIdx < eqLen) {
+          // We didn't find the (entire) key/value separator
+          if (lastPos < end) {
+            // Treat the substring as part of the key instead of the value
+            key += str.slice(lastPos, end);
+          } else if (key.length === 0) {
+            // We saw an empty substring between separators
+            if (--pairs === 0) {
+              return obj;
+            }
+            lastPos = i + 1;
+            sepIdx = eqIdx = 0;
+            continue;
+          }
+        } else if (lastPos < end) {
+          value += str.slice(lastPos, end);
+        }
+
+        addKeyVal(obj, key, value, keyEncoded, valEncoded, decode);
+
+        if (--pairs === 0) {
+          return obj;
+        }
+        key = value = "";
+        encodeCheck = 0;
+        lastPos = i + 1;
+        sepIdx = eqIdx = 0;
+      }
+    } else {
+      sepIdx = 0;
+      // Try matching key/value separator (e.g. '=') if we haven't already
+      if (eqIdx < eqLen) {
+        if (code === eqCodes[eqIdx]) {
+          if (++eqIdx === eqLen) {
+            // Key/value separator match!
+            const end = i - eqIdx + 1;
+            if (lastPos < end) {
+              key += str.slice(lastPos, end);
+            }
+            encodeCheck = 0;
+            lastPos = i + 1;
+          }
+          continue;
+        } else {
+          eqIdx = 0;
+          if (!keyEncoded) {
+            // Try to match an (valid) encoded byte once to minimize unnecessary
+            // calls to string decoding functions
+            if (code === 37 /* % */) {
+              encodeCheck = 1;
+              continue;
+            } else if (encodeCheck > 0) {
+              if (isHexTable[code] === 1) {
+                if (++encodeCheck === 3) {
+                  keyEncoded = true;
+                }
+                continue;
+              } else {
+                encodeCheck = 0;
+              }
+            }
+          }
+        }
+        if (code === 43 /* + */) {
+          if (lastPos < i) {
+            key += str.slice(lastPos, i);
+          }
+          key += plusChar;
+          lastPos = i + 1;
+          continue;
+        }
+      }
+      if (code === 43 /* + */) {
+        if (lastPos < i) {
+          value += str.slice(lastPos, i);
+        }
+        value += plusChar;
+        lastPos = i + 1;
+      } else if (!valEncoded) {
+        // Try to match an (valid) encoded byte (once) to minimize unnecessary
+        // calls to string decoding functions
+        if (code === 37 /* % */) {
+          encodeCheck = 1;
+        } else if (encodeCheck > 0) {
+          if (isHexTable[code] === 1) {
+            if (++encodeCheck === 3) {
+              valEncoded = true;
+            }
+          } else {
+            encodeCheck = 0;
+          }
+        }
+      }
+    }
+  }
+
+  // Deal with any leftover key or value data
+  if (lastPos < str.length) {
+    if (eqIdx < eqLen) {
+      key += str.slice(lastPos);
+    } else if (sepIdx < sepLen) {
+      value += str.slice(lastPos);
+    }
+  } else if (eqIdx === 0 && key.length === 0) {
+    // We ended on an empty substring
+    return obj;
+  }
+
+  addKeyVal(obj, key, value, keyEncoded, valEncoded, decode);
+
+  return obj;
+}
+
+interface StringifyOptions {
+  /** The function to use when converting URL-unsafe characters to percent-encoding in the query string. */
+  encodeURIComponent: (string: string) => string;
+}
+
+/**
+ * These characters do not need escaping when generating query strings:
+ * ! - . _ ~
+ * ' ( ) *
+ * digits
+ * alpha (uppercase)
+ * alpha (lowercase)
+ */
+// deno-fmt-ignore
+const noEscape = new Int8Array([
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0 - 15
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 16 - 31
+  0, 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 0, // 32 - 47
+  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, // 48 - 63
+  0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 64 - 79
+  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, // 80 - 95
+  0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 96 - 111
+  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 0,  // 112 - 127
+]);
+
+// deno-lint-ignore no-explicit-any
+function stringifyPrimitive(v: any): string {
+  if (typeof v === "string") {
+    return v;
+  }
+  if (typeof v === "number" && isFinite(v)) {
+    return "" + v;
+  }
+  if (typeof v === "bigint") {
+    return "" + v;
+  }
+  if (typeof v === "boolean") {
+    return v ? "true" : "false";
+  }
+  return "";
+}
+
+function encodeStringifiedCustom(
+  // deno-lint-ignore no-explicit-any
+  v: any,
+  encode: (string: string) => string,
+): string {
+  return encode(stringifyPrimitive(v));
+}
+
+// deno-lint-ignore no-explicit-any
+function encodeStringified(v: any, encode: (string: string) => string): string {
+  if (typeof v === "string") {
+    return (v.length ? encode(v) : "");
+  }
+  if (typeof v === "number" && isFinite(v)) {
+    // Values >= 1e21 automatically switch to scientific notation which requires
+    // escaping due to the inclusion of a '+' in the output
+    return (Math.abs(v) < 1e21 ? "" + v : encode("" + v));
+  }
+  if (typeof v === "bigint") {
+    return "" + v;
+  }
+  if (typeof v === "boolean") {
+    return v ? "true" : "false";
+  }
+  return "";
+}
+
+/**
+ * Produces a URL query string from a given obj by iterating through the object's "own properties".
+ * @param obj The object to serialize into a URL query string.
+ * @param sep The substring used to delimit key and value pairs in the query string. Default: '&'.
+ * @param eq The substring used to delimit keys and values in the query string. Default: '='.
+ * @param options The stringify options
+ * @param options.encodeURIComponent The function to use when converting URL-unsafe characters to percent-encoding in the query string. Default: `querystring.escape()`.
+ * @legacy
+ * @see Tested in `test-querystring.js`
+ */
+export function stringify(
+  // deno-lint-ignore no-explicit-any
+  obj: Record<string, any>,
+  sep?: string,
+  eq?: string,
+  options?: StringifyOptions,
+): string {
+  sep ||= "&";
+  eq ||= "=";
+  const encode = options ? options.encodeURIComponent : qsEscape;
+  const convert = options ? encodeStringifiedCustom : encodeStringified;
+
+  if (obj !== null && typeof obj === "object") {
+    const keys = Object.keys(obj);
+    const len = keys.length;
+    let fields = "";
+    for (let i = 0; i < len; ++i) {
+      const k = keys[i];
+      const v = obj[k];
+      let ks = convert(k, encode);
+      ks += eq;
+
+      if (Array.isArray(v)) {
+        const vlen = v.length;
+        if (vlen === 0) continue;
+        if (fields) {
+          fields += sep;
+        }
+        for (let j = 0; j < vlen; ++j) {
+          if (j) {
+            fields += sep;
+          }
+          fields += ks;
+          fields += convert(v[j], encode);
+        }
+      } else {
+        if (fields) {
+          fields += sep;
+        }
+        fields += ks;
+        fields += convert(v, encode);
+      }
+    }
+    return fields;
+  }
+  return "";
+}
+
+// deno-fmt-ignore
+const unhexTable = new Int8Array([
+  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 0 - 15
+  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 16 - 31
+  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 32 - 47
+  +0, +1, +2, +3, +4, +5, +6, +7, +8, +9, -1, -1, -1, -1, -1, -1, // 48 - 63
+  -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 64 - 79
+  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 80 - 95
+  -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 96 - 111
+  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 112 - 127
+  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 128 ...
+  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // ... 255
+]);
+
+/**
+ * A safe fast alternative to decodeURIComponent
+ */
+export function unescapeBuffer(s: string, decodeSpaces = false): Buffer {
+  const out = Buffer.alloc(s.length);
+  let index = 0;
+  let outIndex = 0;
+  let currentChar;
+  let nextChar;
+  let hexHigh;
+  let hexLow;
+  const maxLength = s.length - 2;
+  // Flag to know if some hex chars have been decoded
+  let hasHex = false;
+  while (index < s.length) {
+    currentChar = s.charCodeAt(index);
+    if (currentChar === 43 /* '+' */ && decodeSpaces) {
+      out[outIndex++] = 32; // ' '
+      index++;
+      continue;
+    }
+    if (currentChar === 37 /* '%' */ && index < maxLength) {
+      currentChar = s.charCodeAt(++index);
+      hexHigh = unhexTable[currentChar];
+      if (!(hexHigh >= 0)) {
+        out[outIndex++] = 37; // '%'
+        continue;
+      } else {
+        nextChar = s.charCodeAt(++index);
+        hexLow = unhexTable[nextChar];
+        if (!(hexLow >= 0)) {
+          out[outIndex++] = 37; // '%'
+          index--;
+        } else {
+          hasHex = true;
+          currentChar = hexHigh * 16 + hexLow;
+        }
+      }
+    }
+    out[outIndex++] = currentChar;
+    index++;
+  }
+  return hasHex ? out.slice(0, outIndex) : out;
+}
+
+function qsUnescape(s: string): string {
+  try {
+    return decodeURIComponent(s);
+  } catch {
+    return unescapeBuffer(s).toString();
+  }
+}
+
+/**
+ * Performs decoding of URL percent-encoded characters on the given `str`.
+ * Used by `querystring.parse()` and is generally not expected to be used directly.
+ * It is exported primarily to allow application code to provide a replacement decoding implementation if necessary by assigning `querystring.unescape` to an alternative function.
+ * @legacy
+ * @see Tested in `test-querystring-escape.js`
+ */
+export const unescape = qsUnescape;
+
+export default {
+  parse,
+  stringify,
+  decode,
+  encode,
+  unescape,
+  escape,
+  unescapeBuffer,
+};