armand1m · armand1m · Oct 25, 2020 · Oct 24, 2020 · Oct 25, 2020 · Oct 25, 2020
diff --git a/Dockerfile b/Dockerfile
@@ -18,6 +18,5 @@ EXPOSE 3000
 COPY --from=builder /app/node_modules ./node_modules
 COPY --from=builder /app/.next ./.next
 COPY --from=builder /app/postgraphile.tags.json5 ./postgraphile.tags.json5
-RUN npx next telemetry disable
 
 CMD ["node_modules/.bin/next", "start"]
diff --git a/README.md b/README.md
@@ -58,13 +58,15 @@ Contributions for the following are very welcome.
   - [x] Number: Usage Total Count
   - [x] Graph: Usage of last 31 days
 - [ ] Link Ownership
-- [ ] Link Parameters
+- [x] Link Parameters
+  - For example, a `gh` alias with url `https://github.com/$1/$2` allows `https://go/gh/armand1m/golinks` to be possible.
 - [ ] Link Groups (Folders)
   - [x] URL: Accept `/` and can be redirected
   - [ ] UI: Folds URL groups
 - [ ] Private Links
 - [ ] Temporary Links
 - [ ] Random Alias
+- [ ] Help section
 - [ ] Chrome Plugin
 
 ## Usage

diff --git a/lib/features/link-parameters/index.ts b/lib/features/link-parameters/index.ts
@@ -0,0 +1,74 @@
+import { ApolloClient, NormalizedCacheObject } from '@apollo/client';
+import {
+  GetLinkByAliasDocument,
+  GetLinkByAliasQuery,
+  GetLinkByAliasQueryVariables,
+} from '../../queries/getLinkByAlias.graphql';
+
+interface CreateRedirectUrlProps {
+  linkUrl: string;
+  linkAlias: string;
+  contextAlias: string[];
+}
+
+export const createRedirectUrl = ({
+  linkUrl,
+  linkAlias,
+  contextAlias,
+}: CreateRedirectUrlProps) => {
+  const urlParameters = linkUrl.match(/\$(\d+)/g);
+
+  if (urlParameters?.length) {
+    const parameters = contextAlias.filter(
+      (param) => param !== linkAlias && !linkAlias.includes(param)
+    );
+
+    const finalUrl = urlParameters.reduce((acc, urlParam, index) => {
+      return acc.replace(urlParam, parameters[index]);
+    }, linkUrl);
+
+    return finalUrl;
+  }
+
+  return linkUrl;
+};
+
+interface FindLinkRecursiveProps {
+  contextAlias: string[];
+  apolloClient: ApolloClient<NormalizedCacheObject>;
+}
+
+export const findLinkRecursive = async ({
+  contextAlias,
+  apolloClient,
+}: FindLinkRecursiveProps): Promise<
+  GetLinkByAliasQuery['linkByAlias']
+> => {
+  if (contextAlias.length === 0) {
+    return undefined;
+  }
+
+  const alias = contextAlias.join('/');
+
+  const queryResult = await apolloClient.query<
+    GetLinkByAliasQuery,
+    GetLinkByAliasQueryVariables
+  >({
+    query: GetLinkByAliasDocument,
+    variables: {
+      alias,
+    },
+  });
+
+  const link = queryResult.data.linkByAlias;
+
+  if (!link) {
+    const $contextAlias = contextAlias.slice(0, -1);
+    return findLinkRecursive({
+      contextAlias: $contextAlias,
+      apolloClient,
+    });
+  }
+
+  return link;
+};
diff --git a/pages/[...alias].tsx b/pages/[...alias].tsx
@@ -12,11 +12,6 @@ import {
 
 import { NotFoundAnimation } from '../components/NotFoundAnimation';
 import { TopNavigation } from '../components/TopNavigation';
-import {
-  GetLinkByAliasDocument,
-  GetLinkByAliasQuery,
-  GetLinkByAliasQueryVariables,
-} from '../lib/queries/getLinkByAlias.graphql';
 import {
   CreateLinkUsageMetricDocument,
   CreateLinkUsageMetricMutation,
@@ -27,6 +22,10 @@ import {
   SearchLinksQuery,
   SearchLinksQueryVariables,
 } from '../lib/queries/searchLinks.graphql';
+import {
+  createRedirectUrl,
+  findLinkRecursive,
+} from '../lib/features/link-parameters';
 
 interface Props {
   alias: string;
@@ -133,8 +132,6 @@ export const getServerSideProps: GetServerSideProps<Props> = async (
     context?.req as NextApiRequest
   );
   const apolloClient = initializeApollo();
-
-  const alias = (context.query.alias as string[]).join('/');
   const logoname = Config.metadata.logoname;
   const baseUrl = Config.metadata.baseUrl;
   const isAuthEnabled = Config.features.auth0;
@@ -148,19 +145,14 @@ export const getServerSideProps: GetServerSideProps<Props> = async (
       )
     : false;
 
-  const queryResult = await apolloClient.query<
-    GetLinkByAliasQuery,
-    GetLinkByAliasQueryVariables
-  >({
-    query: GetLinkByAliasDocument,
-    variables: {
-      alias,
-    },
+  const contextAlias = context.query.alias as string[];
+  const link = await findLinkRecursive({
+    contextAlias,
+    apolloClient,
   });
 
-  const link = queryResult.data.linkByAlias;
-
   if (!link) {
+    const alias = contextAlias.join('/');
     const searchResults = await apolloClient.query<
       SearchLinksQuery,
       SearchLinksQueryVariables
@@ -187,7 +179,7 @@ export const getServerSideProps: GetServerSideProps<Props> = async (
   }
 
   /**
-   * Trigger metric update and forget about it.
+   * Trigger metric update in the background.
    */
   apolloClient
     .mutate<
@@ -214,7 +206,11 @@ export const getServerSideProps: GetServerSideProps<Props> = async (
   const response = context.res;
 
   response.writeHead(302, {
-    Location: link.url,
+    Location: createRedirectUrl({
+      linkUrl: link.url,
+      linkAlias: link.alias,
+      contextAlias,
+    }),
   });
 
   response.end();
@@ -225,7 +221,7 @@ export const getServerSideProps: GetServerSideProps<Props> = async (
    **/
   return {
     props: {
-      alias,
+      alias: link.alias,
       baseUrl,
       logoname,
       isMobile,