From a8149c0f1ab4d166c8fcada860b4bc9355b807ad Mon Sep 17 00:00:00 2001
From: Reto Brunner <reto@slightlybroken.com>
Date: Sun, 29 Jan 2023 16:58:33 +0100
Subject: [PATCH] Extract linkify to shared directory

This is the first step to sever any dependency of the server on
the client
---
 server/plugins/irc-events/link.ts |  2 +-
 server/tsconfig.json              |  3 +-
 shared/linkify.ts                 | 84 +++++++++++++++++++++++++++++++
 shared/tsconfig.json              | 13 +++++
 4 files changed, 100 insertions(+), 2 deletions(-)
 create mode 100644 shared/linkify.ts
 create mode 100644 shared/tsconfig.json

diff --git a/server/plugins/irc-events/link.ts b/server/plugins/irc-events/link.ts
index e370fc7a..9755d556 100644
--- a/server/plugins/irc-events/link.ts
+++ b/server/plugins/irc-events/link.ts
@@ -5,7 +5,7 @@ import mime from "mime-types";
 
 import log from "../../log";
 import Config from "../../config";
-import {findLinksWithSchema} from "../../../client/js/helpers/ircmessageparser/findLinks";
+import {findLinksWithSchema} from "../../../shared/linkify";
 import storage from "../storage";
 import Client from "../../client";
 import Chan from "../../models/chan";
diff --git a/server/tsconfig.json b/server/tsconfig.json
index b62bf9eb..1c012b95 100644
--- a/server/tsconfig.json
+++ b/server/tsconfig.json
@@ -2,7 +2,8 @@
   "extends": "../tsconfig.base.json" /* Path to base configuration file to inherit from. Requires TypeScript version 2.1 or later. */,
   "include": [
     "**/*",
-    "../client/js/helpers/ircmessageparser/*.ts"
+    "../client/js/helpers/ircmessageparser/*.ts",
+    "../shared/"
   ] /* Specifies a list of glob patterns that match files to be included in compilation. If no 'files' or 'include' property is present in a tsconfig.json, the compiler defaults to including all files in the containing directory and subdirectories except those specified by 'exclude'. Requires TypeScript version 2.0 or later. */,
   "files": [
     "../client/js/constants.ts",
diff --git a/shared/linkify.ts b/shared/linkify.ts
new file mode 100644
index 00000000..b403b533
--- /dev/null
+++ b/shared/linkify.ts
@@ -0,0 +1,84 @@
+import LinkifyIt, {Match} from "linkify-it";
+import tlds from "tlds";
+
+export type NoSchemaMatch = Match & {
+	noschema: boolean;
+};
+
+export type LinkPart = {
+	start: number;
+	end: number;
+	link: string;
+};
+
+LinkifyIt.prototype.normalize = function normalize(match: NoSchemaMatch) {
+	match.noschema = false;
+
+	if (!match.schema) {
+		match.schema = "http:";
+		match.url = "http://" + match.url;
+		match.noschema = true;
+	}
+
+	if (match.schema === "//") {
+		match.schema = "http:";
+		match.url = "http:" + match.url;
+		match.noschema = true;
+	}
+
+	if (match.schema === "mailto:" && !/^mailto:/i.test(match.url)) {
+		match.url = "mailto:" + match.url;
+	}
+};
+
+const linkify = LinkifyIt().tlds(tlds).tlds("onion", true);
+
+// Known schemes to detect in text
+const commonSchemes = [
+	"sftp",
+	"smb",
+	"file",
+	"irc",
+	"ircs",
+	"svn",
+	"git",
+	"steam",
+	"mumble",
+	"ts3server",
+	"svn+ssh",
+	"ssh",
+	"gopher",
+	"gemini",
+];
+
+for (const schema of commonSchemes) {
+	linkify.add(schema + ":", "http:");
+}
+
+export function findLinks(text: string) {
+	const matches = linkify.match(text) as NoSchemaMatch[];
+
+	if (!matches) {
+		return [];
+	}
+
+	return matches.map(makeLinkPart);
+}
+
+export function findLinksWithSchema(text: string) {
+	const matches = linkify.match(text) as NoSchemaMatch[];
+
+	if (!matches) {
+		return [];
+	}
+
+	return matches.filter((url) => !url.noschema).map(makeLinkPart);
+}
+
+function makeLinkPart(url: NoSchemaMatch): LinkPart {
+	return {
+		start: url.index,
+		end: url.lastIndex,
+		link: url.url,
+	};
+}
diff --git a/shared/tsconfig.json b/shared/tsconfig.json
new file mode 100644
index 00000000..fedb8212
--- /dev/null
+++ b/shared/tsconfig.json
@@ -0,0 +1,13 @@
+{
+  "extends": "../tsconfig.base.json" /* Path to base configuration file to inherit from. Requires TypeScript version 2.1 or later. */,
+  "include": [
+    "*"
+  ] /* Specifies a list of glob patterns that match files to be included in compilation. If no 'files' or 'include' property is present in a tsconfig.json, the compiler defaults to including all files in the containing directory and subdirectories except those specified by 'exclude'. Requires TypeScript version 2.0 or later. */,
+  "files": [] /* If no 'files' or 'include' property is present in a tsconfig.json, the compiler defaults to including all files in the containing directory and subdirectories except those specified by 'exclude'. When a 'files' property is specified, only those files and those specified by 'include' are included. */,
+  "ts-node": {
+    "files": true
+  },
+  "compilerOptions": {
+    "noEmit": false /* Disable emitting file from a compilation. See more: https://www.typescriptlang.org/tsconfig#noEmit */
+  }
+}