Preview arbitrary urls within a document (#5598)

server/utils/unfurl.ts

@@ -1,3 +1,4 @@
+import { existsSync } from "fs";
 import path from "path";
 import glob from "glob";
 import { startCase } from "lodash";
@@ -5,20 +6,36 @@ import env from "@server/env";
 import Logger from "@server/logging/Logger";
 import { UnfurlResolver } from "@server/types";
 
-const resolvers: Record<string, UnfurlResolver> = {};
 const rootDir = env.ENVIRONMENT === "test" ? "" : "build";
 
-glob
-  .sync(path.join(rootDir, "plugins/*/server/unfurl.js"))
-  .forEach((filePath: string) => {
+const hasResolver = (plugin: string) => {
+  // eslint-disable-next-line @typescript-eslint/no-var-requires
+  const config = require(path.join(process.cwd(), plugin, "plugin.json"));
+
+  return (
+    existsSync(resolverPath(plugin)) &&
+    (config.requiredEnvVars ?? []).every((name: string) => !!env[name])
+  );
+};
+
+const resolverPath = (plugin: string) =>
+  path.join(plugin, "server", "unfurl.js");
+
+const plugins = glob.sync(path.join(rootDir, "plugins/*"));
+const resolvers: Record<string, UnfurlResolver> = plugins
+  .filter(hasResolver)
+  .map(resolverPath)
+  .reduce((resolvers, resolverPath) => {
     // eslint-disable-next-line @typescript-eslint/no-var-requires
     const resolver: UnfurlResolver = require(path.join(
       process.cwd(),
-      filePath
+      resolverPath
     ));
-    const name = startCase(filePath.split("/")[2]);
+    const name = startCase(resolverPath.split("/")[2]);
     resolvers[name] = resolver;
-    Logger.debug("utils", `Registered unfurl resolver ${filePath}`);
-  });
+    Logger.debug("utils", `Registered unfurl resolver ${resolverPath}`);
 
-export const Iframely = resolvers["Iframely"];
+    return resolvers;
+  }, {});
+
+export default resolvers;