Avatar

karfau

24 public vals
Joined August 11, 2023
karfau avatar
getRaw
@karfau
Script
A helper to get the raw data of a val, using the very nice implementation from @pomdtr.raw . Usage: https://www.val.town/v/karfau.test_getRaw Also look at @karfau.rawUrl to just get the raw url of another val inside a val.
karfau avatar
testRunner
@karfau
Script
Test runner to be able to run a number of tests (e.g. on a different val). check the references for seeing how it is used. It is extracted into a val to avoid having all that clutter in the same val as your tests. Each test is a named function (which can be async), the name is used as the name for the test. the input passed as the first argument is passed to each test, great for importing assertion methods, stubs, fixed values, ... everything that you do not mutate during a test if a function is async (it returns a promise) there is a timeout of 2 seconds before the test is marked as failed. all tests are called in the declared order, but async tests run in parallel afterwards, so don't assume any order if a test starts with skip it is not executed if a test fails it throws the output, so it appears in the read box below the val and the evaluation/run is marked red if all tests pass it returns the output, so it appears in the grey box and the evaluation/run is marked green. Note: If you are using the test runner to store the result in that val, as described above, it is considered a "JSON val" and has a run button, but it also means that another of your vals could update the val with just any other (JSON) state. Alternatively you can define a function val that calls the test runner and have a separete val to keep the curretn test results, but it means after updating the tests you need to fest save that val and then reevaluate to val storing the test state.
karfau avatar
aocXX_00
@karfau
Script
This is a great template if you want to solve the https://adventofcode.com puzzles in a TDD style: dump your puzzle input into the input function copy/paste sample input and output from the page once all assertions pass, the solution is calculated There is one function for each star that can be achieved. Some helpers for common tasks are defined at the end of code: debug , toInt , exctractNumbers , sum , ... ? PS: Did you know advent of code goes as far back as 2015 and you can still solve those puzzles?
karfau avatar
SignatureCheck
@karfau
Script
This val has been created to avoid certain shortcomings of @vtdocs.verifyGithubWebhookSignature . So it was created as a mix/evolution of two sources: The github docs about securing webhook Some code from the @octokit/webhhokmethods package This code is covered by tests which you can copy to run them, see @karfau.test_SignatureCheck This val does not contain any val.town specific code ( @ -imports, console.email ...), so it should be possible to run in Deno as is, potentially even in modern browsers (that support crypto and TextEncoder and modern ES syntax). Usage const myGithubWebhook = (req: Request) => { const {verify} = @karfau.SignatureCheck(); // you have to call it to get the verify function! const body = await req.text(); const signature = req.headers.get("X-Hub-Signature-256"); const verified = await verify( {payload:body, signature}, @me.secrets.myGithubWebhookSecret, // optionally provide fallback secrets (as many as needed) // @me.secrets.myGithubWebhookSecretFallback ); if (!verified) { return new Response(`Not verified`, 401); } const payload = JSON.parse(body); // actually do things in your webhook }; By default the reason for failing verification is logged to console.error , but you can pass it a different handler: const {verify} = @karfau.SignatureCheck((reason) => { throw new Error(reason); }); (be aware that it will silently fail if you don't try catch it in an endpoint and the return code will be 502) Why @vtdocs.verifyGithubWebhookSignature has the following issues: it relies on the verify method of the outdated @octokit/webhooks-methods@3.0.2 which has (at least) two bugs that can make a difference when used in a webhook it can throws errors instead of just returning false , which can be triggered by sending an invalid signature it can be lured into checking a SHA1 signature if the signature header starts with sha1= you need to pass the secret and payload as argument to the val, which makes them appear in the evaluation logs you produce ( they are only visible for the author of the val if you run them as an API , but it still feels odd to see the secret in the evaluation logs.) parameters are all of type string and the order can be confused you can not use fallback secrets for rotating
karfau avatar
mainReference
@karfau
Script
Finds the top level named val that triggered the execution of this val. (Ignores any untitled vals, since those are sometimes created as an execution context.) By passing a function as the first argument you receive all references as arguments, and can pick or transform them, e.g. @karfau.refToValUrl Possible Limitation: https://discord.com/channels/1020432421243592714/1143386413748994143
karfau avatar
isRequest
@karfau
Script
A type guard for vals that expect a WebApi Request as the first parameter. Since a val can be invoked by run, web, express or even email, the correct type for a web endpoint should be req?: Request | unknown . By using this type guard and handling the false case, all later code can safely access the request: export const myVal = (req?: Request | unknown) => { if (!@karfau.isRequest(req)) { return `This val has to be used with the web endpoint, see ${@neverstew.thisValUrl()}`; } if (req.method === 'GET') { // ... } }
karfau avatar
githubEmoji
@karfau
HTTP
Usage import {githubEmojiUrl} from "https://esm.town/v/karfau/githubEmoji"; console.log(githubEmojiUrl('+1')) //"https://github.githubassets.com/images/icons/emoji/unicode/1f44d.png?v8" or in a browser <img src="https://karfau-githubEmoji.web.val.run/+1"></img> Looks like in the preview. curl https://karfau-githubEmoji.web.val.run/+1 (prints "https://github.githubassets.com/images/icons/emoji/unicode/1f44d.png?v8" ) If the name you pass (as argument or in the request path) is not in the list, it returns The list of names can be accessed using githubEmojiNames or by calling https://karfau-githubemoji.web.val.run/names
karfau avatar
test_getRaw
@karfau
Script
An interactive, runnable TypeScript val by karfau
karfau avatar
rawUrl
@karfau
Script
A helper for creating the URL to request the raw data of a val, defaulting to use the very nice implementation from @pomdtr.raw . Also look at @karfau.getRaw to get the data of a val inside a val.
karfau avatar
githubWebhookApproveDependencyPRs
@karfau
Script
A webhook to approve dependency PRs created by bots The webhook can be configured on the repo or on the org level it needs to have the Payload URL set to the "web endpoint" of the val ( ... -> Endpoints -> Copy web endpoint) it needs to POST a json payload it needs to receive the workflow_runs events it needs to have the webhookSecret configured to the same value as in val town secrets (line 7) (else response is 401: Not verified ) It will only approve if all of the following conditions are met: the event action is completed , the workflow_run.conclusion has to be success , and the event is related to exactly one pull request (else response is 202: Ignored (event) ) the PR is authored authored by one of the users listed in allowedAuthors (line 5) (else response is 202: Ignored (pr author) ) the githubApiToken configured in line 9 needs to have repo access to the related repository (else response is 50x: some error message ) a branch protection has to be configured that requires at least one review approval and at least one status check (else response is 202: Ignored (branch protection) ) the PR has auto-merge enabled (else response is 202: Ignored (pr status) ) the PR has any failing status checks (even if not required) (else response is 202: Ignored (pr checks) ) the current value for dryRun is false (line 3) (else response is 200: Would have been approved (dryRun) ) If it approves the PR, it leaves a comment pointing to the website of this val.
karfau avatar
aoc23_08
@karfau
Script
https://adventofcode.com/2023/day/8 the script times out on val.town, so I ran it with deno on my machine for some mintes. By running deno run https://esm.town/v/karfau/aoc23_08 | grep z I observed a repeating pattern in the output... each "track" was reaching the same position over and over again, but not on the same lines. I dumped the beginning of the output into a text file, opened it to look at the patterns and confirmed that each "track" had a fixed frequency for each position ending on a Z. so I took the "step"(+1 because it's zero based) and checked the primes each of them contains, to get the correct input. I calculated that with a calculator and copied in the number.
karfau avatar
aoc23_07
@karfau
Script
https://adventofcode.com/2023/day/7
karfau avatar
aoc23_06
@karfau
Script
https://adventofcode.com/2023/day/6
karfau avatar
aoc23_05
@karfau
Script
https://adventofcode.com/2023/day/5 Oh boy, what a tedious one. I don't see any quick and easy optimization strategies here. the parsing is the most tedious part of this. The first part went way more smoothly than I initially thought, by splitting the different steps into smaller pieces. But the second part is a hard nut to crack. So many runtime/performance issues because the numbers are so "big" that my intail approach no longer works. Last nut I finally cracked was in v28 by running the following on a powerful desktop machine for nearly an hour: deno run https://esm.town/v/karfau/aoc23_05?v=28 (that is the module URL) to get the correct solution.
karfau avatar
aoc15_06
@karfau
Script
https://adventofcode.com/2015/day/6
karfau avatar
aoc15_05
@karfau
Script
// expect(secondStar(""), "*1 sample 2").to.equal("?");