Add URL implementation (#1359)

5 files changed, 397 insertions, 0 deletions

diff --git a/BUILD.gn b/BUILD.gn
index 921754ef1..1f6298ae4 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -100,6 +100,7 @@ ts_sources = [
   "js/timers.ts",
   "js/truncate.ts",
   "js/types.ts",
+  "js/url.ts",
   "js/url_search_params.ts",
   "js/util.ts",
   "js/write_file.ts",
diff --git a/js/globals.ts b/js/globals.ts
index cf45b4239..ac66f77e6 100644
--- a/js/globals.ts
+++ b/js/globals.ts
@@ -16,6 +16,7 @@ import * as fetchTypes from "./fetch";
 import * as headers from "./headers";
 import * as textEncoding from "./text_encoding";
 import * as timers from "./timers";
+import * as url from "./url";
 import * as urlSearchParams from "./url_search_params";
 
 // These imports are not exposed and therefore are fine to just import the
@@ -56,6 +57,8 @@ window.Blob = blob.DenoBlob;
 export type Blob = blob.DenoBlob;
 window.File = file.DenoFile;
 export type File = file.DenoFile;
+window.URL = url.URL;
+export type URL = url.URL;
 window.URLSearchParams = urlSearchParams.URLSearchParams;
 export type URLSearchParams = urlSearchParams.URLSearchParams;
 
diff --git a/js/unit_tests.ts b/js/unit_tests.ts
index 55877091e..6ac071d3e 100644
--- a/js/unit_tests.ts
+++ b/js/unit_tests.ts
@@ -34,5 +34,6 @@ import "./symlink_test.ts";
 import "./text_encoding_test.ts";
 import "./timers_test.ts";
 import "./truncate_test.ts";
+import "./url_test.ts";
 import "./url_search_params_test.ts";
 import "./write_file_test.ts";
diff --git a/js/url.ts b/js/url.ts
new file mode 100644
index 000000000..42a2577e1
--- /dev/null
+++ b/js/url.ts
@@ -0,0 +1,261 @@
+// Copyright 2018 the Deno authors. All rights reserved. MIT license.
+import * as urlSearchParams from "./url_search_params";
+
+interface URLParts {
+  protocol: string;
+  username: string;
+  password: string;
+  hostname: string;
+  port: string;
+  path: string;
+  query: string;
+  hash: string;
+}
+
+const patterns = {
+  protocol: "(?:([^:/?#]+):)",
+  authority: "(?://([^/?#]*))",
+  path: "([^?#]*)",
+  query: "(\\?[^#]*)",
+  hash: "(#.*)",
+
+  authentication: "(?:([^:]*)(?::([^@]*))?@)",
+  hostname: "([^:]+)",
+  port: "(?::(\\d+))"
+};
+
+const urlRegExp = new RegExp(
+  `^${patterns.protocol}?${patterns.authority}?${patterns.path}${
+    patterns.query
+  }?${patterns.hash}?`
+);
+
+const authorityRegExp = new RegExp(
+  `^${patterns.authentication}?${patterns.hostname}${patterns.port}?$`
+);
+
+const searchParamsMethods: Array<keyof urlSearchParams.URLSearchParams> = [
+  "append",
+  "delete",
+  "set"
+];
+
+function parse(url: string): URLParts | undefined {
+  const urlMatch = urlRegExp.exec(url);
+  if (urlMatch) {
+    const [, , authority] = urlMatch;
+    const authorityMatch = authority
+      ? authorityRegExp.exec(authority)
+      : [null, null, null, null, null];
+    if (authorityMatch) {
+      return {
+        protocol: urlMatch[1] || "",
+        username: authorityMatch[1] || "",
+        password: authorityMatch[2] || "",
+        hostname: authorityMatch[3] || "",
+        port: authorityMatch[4] || "",
+        path: urlMatch[3] || "",
+        query: urlMatch[4] || "",
+        hash: urlMatch[5] || ""
+      };
+    }
+  }
+  return undefined;
+}
+
+export class URL {
+  private _parts: URLParts;
+  private _searchParams!: urlSearchParams.URLSearchParams;
+
+  private _updateSearchParams() {
+    const searchParams = new urlSearchParams.URLSearchParams(this.search);
+
+    for (const methodName of searchParamsMethods) {
+      // tslint:disable:no-any
+      const method: (...args: any[]) => any = searchParams[methodName];
+      searchParams[methodName] = (...args: any[]) => {
+        method.apply(searchParams, args);
+        this.search = searchParams.toString();
+      };
+      // tslint:enable
+    }
+    this._searchParams = searchParams;
+  }
+
+  get hash(): string {
+    return this._parts.hash;
+  }
+
+  set hash(value: string) {
+    value = unescape(String(value));
+    if (!value) {
+      this._parts.hash = "";
+    } else {
+      if (value.charAt(0) !== "#") {
+        value = `#${value}`;
+      }
+      // hashes can contain % and # unescaped
+      this._parts.hash = escape(value)
+        .replace(/%25/g, "%")
+        .replace(/%23/g, "#");
+    }
+  }
+
+  get host(): string {
+    return `${this.hostname}${this.port ? `:${this.port}` : ""}`;
+  }
+
+  set host(value: string) {
+    value = String(value);
+    const url = new URL(`http://${value}`);
+    this._parts.hostname = url.hostname;
+    this._parts.port = url.port;
+  }
+
+  get hostname(): string {
+    return this._parts.hostname;
+  }
+
+  set hostname(value: string) {
+    value = String(value);
+    this._parts.hostname = encodeURIComponent(value);
+  }
+
+  get href(): string {
+    const authentication =
+      this.username || this.password
+        ? `${this.username}${this.password ? ":" + this.password : ""}@`
+        : "";
+
+    return `${this.protocol}//${authentication}${this.host}${this.pathname}${
+      this.search
+    }${this.hash}`;
+  }
+
+  set href(value: string) {
+    value = String(value);
+    if (value !== this.href) {
+      const url = new URL(value);
+      this._parts = { ...url._parts };
+      this._updateSearchParams();
+    }
+  }
+
+  get origin(): string {
+    return `${this.protocol}//${this.host}`;
+  }
+
+  get password(): string {
+    return this._parts.password;
+  }
+
+  set password(value: string) {
+    value = String(value);
+    this._parts.password = encodeURIComponent(value);
+  }
+
+  get pathname(): string {
+    return this._parts.path ? this._parts.path : "/";
+  }
+
+  set pathname(value: string) {
+    value = unescape(String(value));
+    if (!value || value.charAt(0) !== "/") {
+      value = `/${value}`;
+    }
+    // paths can contain % unescaped
+    this._parts.path = escape(value).replace(/%25/g, "%");
+  }
+
+  get port(): string {
+    return this._parts.port;
+  }
+
+  set port(value: string) {
+    const port = parseInt(String(value), 10);
+    this._parts.port = isNaN(port)
+      ? ""
+      : Math.max(0, port % 2 ** 16).toString();
+  }
+
+  get protocol(): string {
+    return `${this._parts.protocol}:`;
+  }
+
+  set protocol(value: string) {
+    value = String(value);
+    if (value) {
+      if (value.charAt(value.length - 1) === ":") {
+        value = value.slice(0, -1);
+      }
+      this._parts.protocol = encodeURIComponent(value);
+    }
+  }
+
+  get search(): string {
+    return this._parts.query;
+  }
+
+  set search(value: string) {
+    value = String(value);
+    if (value.charAt(0) !== "?") {
+      value = `?${value}`;
+    }
+    this._parts.query = value;
+    this._updateSearchParams();
+  }
+
+  get username(): string {
+    return this._parts.username;
+  }
+
+  set username(value: string) {
+    value = String(value);
+    this._parts.username = encodeURIComponent(value);
+  }
+
+  get searchParams(): urlSearchParams.URLSearchParams {
+    return this._searchParams;
+  }
+
+  constructor(url: string, base?: string | URL) {
+    let baseParts: URLParts | undefined;
+    if (base) {
+      baseParts = typeof base === "string" ? parse(base) : base._parts;
+      if (!baseParts) {
+        throw new TypeError("Invalid base URL.");
+      }
+    }
+
+    const urlParts = parse(url);
+    if (!urlParts) {
+      throw new TypeError("Invalid URL.");
+    }
+
+    if (urlParts.protocol) {
+      this._parts = urlParts;
+    } else if (baseParts) {
+      this._parts = {
+        protocol: baseParts.protocol,
+        username: baseParts.username,
+        password: baseParts.password,
+        hostname: baseParts.hostname,
+        port: baseParts.port,
+        path: urlParts.path || baseParts.path,
+        query: urlParts.query || baseParts.query,
+        hash: urlParts.hash
+      };
+    } else {
+      throw new TypeError("URL requires a base URL.");
+    }
+    this._updateSearchParams();
+  }
+
+  toString(): string {
+    return this.href;
+  }
+
+  toJSON(): string {
+    return this.href;
+  }
+}
diff --git a/js/url_test.ts b/js/url_test.ts
new file mode 100644
index 000000000..f89845274
--- /dev/null
+++ b/js/url_test.ts
@@ -0,0 +1,131 @@
+// Copyright 2018 the Deno authors. All rights reserved. MIT license.
+import { test, assert, assertEqual } from "./test_util.ts";
+
+test(function urlParsing() {
+  const url = new URL(
+    "https://foo:bar@baz.qat:8000/qux/quux?foo=bar&baz=12#qat"
+  );
+  assertEqual(url.hash, "#qat");
+  assertEqual(url.host, "baz.qat:8000");
+  assertEqual(url.hostname, "baz.qat");
+  assertEqual(
+    url.href,
+    "https://foo:bar@baz.qat:8000/qux/quux?foo=bar&baz=12#qat"
+  );
+  assertEqual(url.origin, "https://baz.qat:8000");
+  assertEqual(url.password, "bar");
+  assertEqual(url.pathname, "/qux/quux");
+  assertEqual(url.port, "8000");
+  assertEqual(url.protocol, "https:");
+  assertEqual(url.search, "?foo=bar&baz=12");
+  assertEqual(url.searchParams.getAll("foo"), ["bar"]);
+  assertEqual(url.searchParams.getAll("baz"), ["12"]);
+  assertEqual(url.username, "foo");
+  assertEqual(
+    String(url),
+    "https://foo:bar@baz.qat:8000/qux/quux?foo=bar&baz=12#qat"
+  );
+  assertEqual(
+    JSON.stringify({ key: url }),
+    `{"key":"https://foo:bar@baz.qat:8000/qux/quux?foo=bar&baz=12#qat"}`
+  );
+});
+
+test(function urlModifications() {
+  const url = new URL(
+    "https://foo:bar@baz.qat:8000/qux/quux?foo=bar&baz=12#qat"
+  );
+  url.hash = "";
+  assertEqual(url.href, "https://foo:bar@baz.qat:8000/qux/quux?foo=bar&baz=12");
+  url.host = "qat.baz:8080";
+  assertEqual(url.href, "https://foo:bar@qat.baz:8080/qux/quux?foo=bar&baz=12");
+  url.hostname = "foo.bar";
+  assertEqual(url.href, "https://foo:bar@foo.bar:8080/qux/quux?foo=bar&baz=12");
+  url.password = "qux";
+  assertEqual(url.href, "https://foo:qux@foo.bar:8080/qux/quux?foo=bar&baz=12");
+  url.pathname = "/foo/bar%qat";
+  assertEqual(
+    url.href,
+    "https://foo:qux@foo.bar:8080/foo/bar%qat?foo=bar&baz=12"
+  );
+  url.port = "";
+  assertEqual(url.href, "https://foo:qux@foo.bar/foo/bar%qat?foo=bar&baz=12");
+  url.protocol = "http:";
+  assertEqual(url.href, "http://foo:qux@foo.bar/foo/bar%qat?foo=bar&baz=12");
+  url.search = "?foo=bar&foo=baz";
+  assertEqual(url.href, "http://foo:qux@foo.bar/foo/bar%qat?foo=bar&foo=baz");
+  assertEqual(url.searchParams.getAll("foo"), ["bar", "baz"]);
+  url.username = "foo@bar";
+  assertEqual(
+    url.href,
+    "http://foo%40bar:qux@foo.bar/foo/bar%qat?foo=bar&foo=baz"
+  );
+  url.searchParams.set("bar", "qat");
+  assertEqual(
+    url.href,
+    "http://foo%40bar:qux@foo.bar/foo/bar%qat?foo=bar&foo=baz&bar=qat"
+  );
+  url.searchParams.delete("foo");
+  assertEqual(url.href, "http://foo%40bar:qux@foo.bar/foo/bar%qat?bar=qat");
+  url.searchParams.append("foo", "bar");
+  assertEqual(
+    url.href,
+    "http://foo%40bar:qux@foo.bar/foo/bar%qat?bar=qat&foo=bar"
+  );
+});
+
+test(function urlModifyHref() {
+  const url = new URL("http://example.com/");
+  url.href = "https://foo:bar@example.com:8080/baz/qat#qux";
+  assertEqual(url.protocol, "https:");
+  assertEqual(url.username, "foo");
+  assertEqual(url.password, "bar");
+  assertEqual(url.host, "example.com:8080");
+  assertEqual(url.hostname, "example.com");
+  assertEqual(url.pathname, "/baz/qat");
+  assertEqual(url.hash, "#qux");
+});
+
+test(function urlModifyPathname() {
+  const url = new URL("http://foo.bar/baz%qat/qux%quux");
+  assertEqual(url.pathname, "/baz%qat/qux%quux");
+  url.pathname = url.pathname;
+  assertEqual(url.pathname, "/baz%qat/qux%quux");
+  url.pathname = "baz#qat qux";
+  assertEqual(url.pathname, "/baz%23qat%20qux");
+  url.pathname = url.pathname;
+  assertEqual(url.pathname, "/baz%23qat%20qux");
+});
+
+test(function urlModifyHash() {
+  const url = new URL("http://foo.bar");
+  url.hash = "%foo bar/qat%qux#bar";
+  assertEqual(url.hash, "#%foo%20bar/qat%qux#bar");
+  url.hash = url.hash;
+  assertEqual(url.hash, "#%foo%20bar/qat%qux#bar");
+});
+
+test(function urlSearchParamsReuse() {
+  const url = new URL(
+    "https://foo:bar@baz.qat:8000/qux/quux?foo=bar&baz=12#qat"
+  );
+  const sp = url.searchParams;
+  url.host = "baz.qat";
+  assert(sp === url.searchParams, "Search params should be reused.");
+});
+
+test(function urlBaseURL() {
+  const base = new URL(
+    "https://foo:bar@baz.qat:8000/qux/quux?foo=bar&baz=12#qat"
+  );
+  const url = new URL("/foo/bar?baz=foo#qux", base);
+  assertEqual(url.href, "https://foo:bar@baz.qat:8000/foo/bar?baz=foo#qux");
+});
+
+test(function urlBaseString() {
+  const url = new URL(
+    "/foo/bar?baz=foo#qux",
+    "https://foo:bar@baz.qat:8000/qux/quux?foo=bar&baz=12#qat"
+  );
+  assertEqual(url.href, "https://foo:bar@baz.qat:8000/foo/bar?baz=foo#qux");
+});