--- series: - Projects date: "2021-08-20T00:00:00Z" tags: - gcp - cloud - serverless title: Free serverless URL shortener on Google Cloud Run --- #### Intro I've been [using short.io with a custom domain](https://twitter.com/johndotbowdre/status/1370125198196887556) to keep track of and share messy links for a few months now. That approach has worked very well, but it's also seriously overkill for my needs. I don't need (nor want) tracking metrics to know anything about when those links get clicked, and short.io doesn't provide an easy way to turn that off. I was casually looking for a lighter self-hosted alternative today when I stumbled upon a *serverless* alternative: **[sheets-url-shortener](https://github.com/ahmetb/sheets-url-shortener)**. This uses [Google Cloud Run](https://cloud.google.com/run/) to run an ultralight application container which receives an incoming web request, looks for the path in a Google Sheet, and redirects the client to the appropriate URL. It supports connecting with a custom domain, and should run happily within the [Cloud Run Free Tier limits](https://cloud.google.com/run/pricing). The Github instructions were pretty straight-forward but I did have to fumble through a few additional steps to get everything up and running. Here we go: #### Shortcut mapping Since the setup uses a simple Google Sheets document to map the shortcuts to the original long-form URLs, I started by going to [https://sheets.new](https://sheets.new) to create a new Sheet. I then just copied in the shorcuts and URLs I was already using in short.io. By the way, I learned on a previous attempt that this solution only works with lowercase shortcuts so I made sure to convert my `MixedCase` ones as I went. ![Creating a new sheet](/images/posts-2021/08/20210820_sheet.png) I then made a note of the Sheet ID from the URL; that's the bit that looks like `1SMeoyesCaGHRlYdGj9VyqD-qhXtab1jrcgHZ0irvNDs`. That will be needed later on. #### Create a new GCP project I created a new project in my GCP account by going to [https://console.cloud.google.com/projectcreate](https://console.cloud.google.com/projectcreate) and entering a descriptive name. ![Creating a new GCP project](/images/posts-2021/08/20210820_create_project.png) #### Deploy to GCP At this point, I was ready to actually kick off the deployment. Ahmet made this part exceptionally easy: just hit the **Run on Google Cloud** button from the [Github project page](https://github.com/ahmetb/sheets-url-shortener#setup). That opens up a Google Cloud Shell instance which prompts for authorization before it starts the deployment script. ![Open in Cloud Shell prompt](/images/posts-2021/08/20210820_open_in_cloud_shell.png) ![Authorize Cloud Shell prompt](/images/posts-2021/08/20210820_authorize_cloud_shell.png) The script prompted me to select a project and a region, and then asked for the Sheet ID that I copied earlier. ![Cloud Shell deployment](/images/posts-2021/08/20210820_cloud_shell.png) #### Grant access to the Sheet In order for the Cloud Run service to be able to see the URL mappings in the Sheet I needed to share the Sheet with the service account. That service account is found by going to [https://console.cloud.google.com/run](https://console.cloud.google.com/run), clicking on the new `sheets-url-shortener` service, and then viewing the **Permissions** tab. I'm interested in the one that's `############-computer@developer.gserviceaccount.com`. ![Finding the service account](/images/posts-2021/08/20210820_service_account.png) I then went back to the Sheet, hit the big **Share** button at the top, and shared the Sheet to the service account with *Viewer* access. ![Sharing to the service account](/images/posts-2021/08/20210820_share_with_svc_account.png) #### Quick test Back in GCP land, the details page for the `sheets-url-shortener` Cloud Run service shows a gross-looking URL near the top: `https://sheets-url-shortener-vrw7x6wdzq-uc.a.run.app`. That doesn't do much for *shortening* my links, but it'll do just fine for a quick test. First, I pointed my browser straight to that listed URL: ![Testing the web server](/images/posts-2021/08/20210820_home_page.png) This at least tells me that the web server portion is working. Now to see if I can redirect to my [project car posts on Polywork](https://john.bowdre.net/?badges%5B%5D=Car+Nerd): ![Testing a redirect](/images/posts-2021/08/20210820_sheets_api_disabled.png) Hmm, not quite. Luckily the error tells me exactly what I need to do... #### Enable Sheets API I just needed to visit `https://console.developers.google.com/apis/api/sheets.googleapis.com/overview?project=############` to enable the Google Sheets API. ![Enabling Sheets API](/images/posts-2021/08/20210820_enable_sheets_api.png) Once that's done, I can try my redirect again - and, after a brief moment, it successfully sends me on to Polywork! ![Successful redirect](/images/posts-2021/08/20210820_successful_redirect.png) #### Link custom domain The whole point of this project is to *shorten* URLs, but I haven't done that yet. I'll want to link in my `go.bowdre.net` domain to use that in place of the rather unwieldy `https://sheets-url-shortener-vrw7x6wdzq-uc.a.run.app`. I do that by going back to the [Cloud Run console](https://console.cloud.google.com/run) and selecting the option at the top to **Manage Custom Domains**. ![Manage custom domains](/images/posts-2021/08/20210820_manage_custom_domain.png) I can then use the **Add Mapping** button, select my `sheets-url-shortener` service, choose one of my verified domains (which I *think* are already verified since they're registered through Google Domains with the same account), and then specify the desired subdomain. ![Adding a domain mapping](/images/posts-2021/08/20210820_add_mapping_1.png) The wizard then tells me exactly what record I need to create/update with my domain host: ![CNAME details](/images/posts-2021/08/20210820_add_mapping_2.png) It took a while for the domain mapping to go live once I've updated the record. ![Processing mapping...](/images/posts-2021/08/20210820_domain_mapping.png) #### Final tests Once it did finally update, I was able to hit `https://go.bowdre.net` to get the error/landing page, complete with a valid SSL cert: ![Successful error!](/images/posts-2021/08/20210820_landing_page.png) And testing [go.bowdre.net/ghia](https://go.bowdre.net/ghia) works as well! #### Outro I'm very pleased with how this quick little project turned out. Managing my shortened links with a Google Sheet is quite convenient, and I really like the complete lack of tracking or analytics. Plus I'm a sucker for an excuse to use a cloud technology I haven't played a lot with yet. And now I can hand out handy-dandy short links! | Link | Description| | --- | --- | | [go.bowdre.net/ghia](https://go.bowdre.net/ghia) | 1974 VW Karmann Ghia project | | [go.bowdre.net/conedoge](https://go.bowdre.net/conedoge) | 2014 Subaru BRZ autocross videos | | [go.bowdre.net/matrix](https://go.bowdre.net/matrix) | Chat with me on Matrix | | [go.bowdre.net/twits](https://go.bowdre.net/twits) | Follow me on Twitter | | [go.bowdre.net/stadia](https://go.bowdre.net/stadia) | Game with me on Stadia |