内容简介:Interested? Make sure you readlast year's webmentionspost first, as you'll need to set up Bridgy and Webmention.io as explained there before setting up this Action.First we need to fetch webmentions from webmention.io. We'll write a short Node script for t
Interested? Make sure you readlast year's webmentionspost first, as you'll need to set up Bridgy and Webmention.io as explained there before setting up this Action.
Fetching webmentions
First we need to fetch webmentions from webmention.io. We'll write a short Node script for that. The script will then be called from our GitHub Action, but can be run locally too for testing purposes.
node ./webmentions.js
We need to set a few parameters when querying webmention.io. First, an API token, which we can grab from our settings on webmention.io .
const token = process.env.WEBMENTIONS_TOKEN;
The GitHub Action will retrieve it from the repository's “Secrets”, more on that later. Locally we can set the WEBMENTIONS_TOKEN
on the command line.
WEBMENTIONS_TOKEN=XXX node ./webmentions.js
Next, we determine a start date. We don't always need to fetch all webmentions from the beginning of time.
The Action will run once every six hours. Fetching the webmentions of the past 6 hours should be enough but I've noticed some mentions come in with a delay. My script is currently set up to retrieve all webmentions from the past 3 days. It's okay if we fetch the same mentions multiple times, we'll filter out the duplicates later on.
const since = new Date(); since.setDate(since.getDate() - 3);
With these parameters we can set up a request URL for the webmention.io API.
const url = "https://webmention.io/api/mentions.jf2" + "?domain=sebastiandedeyne.com" + `&token=${token}` + `&since=${since.toISOString()}` + "&per-page=999";
Now to call the URL and grab the webmentions from the response. We'll use Node's built in https
module for this. It's quite verbose, but I like a zero-dependencies approach where possible.
const https = require('https'); function fetchWebmentions() { const token = process.env.WEBMENTIONS_TOKEN; const since = new Date(); since.setDate(since.getDate() - 3); const url = "https://webmention.io/api/mentions.jf2" + "?domain=sebastiandedeyne.com" + `&token=${token}` + `&since=${since.toISOString()}` + "&per-page=999"; return new Promise((resolve, reject) => { https .get(url, res => { let body = ""; res.on("data", chunk => { body += chunk; }); res.on("end", () => { try { resolve(JSON.parse(body)); } catch (error) { reject(error); } }); }) .on("error", error => { reject(error); }); }).then(response => { if (!("children" in response)) { throw new Error("Invalid webmention.io response."); } return response.children; }); }
Webmention.io returns an object with a children
key containing the webmentions.
Now we need to store the webmentions from the response. In a Hugo site, we can store them in data/webmentions
. We'll create one JSON file per webmention target (a webmention target is a fancy word for the URL that the webmention points towards).
data/ webmentions/ adding-webmentions-to-my-blog.json unix-things--listing-directories.json
Slashes in the webmention target get trimmed and replaced with --
, so https://sebastiandedeyne/unix-things/listing-directories/
maps to unix-things--listing-directories.json
.
We can generate a slug with some regex voodoo, then use them to build a full path to a JSON file.
fetchWebmentions().then(webmentions => { webmentions.forEach(webmention => { const slug = webmention["wm-target"] .replace("https://sebastiandedeyne.com/", "") .replace(/\/$/, "") .replace("/", "--"); const filename = `${__dirname}/data/webmentions/${slug}.json`; // ... }); });
Two things can happen now: either it's the first webmention for the target (so there's no JSON file yet), or there already are webmentions for the target (so there's already a JSON file in place).
The first case is the easiest one to handle. If the file doesn't exist yet, we create a new one with the incoming webmention.
fetchWebmentions().then(webmentions => { webmentions.forEach(webmention => { const slug = webmention["wm-target"] .replace("https://sebastiandedeyne.com/", "") .replace(/\/$/, "") .replace("/", "--"); const filename = `${__dirname}/data/webmentions/${slug}.json`; if (!fs.existsSync(filename)) { fs.writeFileSync(filename, JSON.stringify([webmention], null, 2)); return; } }); });
If there already is a JSON file, we need to read it out, append the new webmention, and filter out existing webmentions with the same ID so we're not adding duplicates.
const entries = JSON.parse(fs.readFileSync(filename)) .filter(wm => wm["wm-id"] !== webmention["wm-id"]) .concat([webmention]); entries.sort((a, b) => a["wm-id"] - b["wm-id"]); fs.writeFileSync(filename, JSON.stringify(entries, null, 2));
Before writing the new set of webmentions back to the file, we sorted them to ensure the same set of webmentions always creates the exact same file.
const fs = require("fs"); const https = require("https"); fetchWebmentions().then(webmentions => { webmentions.forEach(webmention => { const slug = webmention["wm-target"] .replace("https://sebastiandedeyne.com/", "") .replace(/\/$/, "") .replace("/", "--"); const filename = `${__dirname}/data/webmentions/${slug}.json`; if (!fs.existsSync(filename)) { fs.writeFileSync(filename, JSON.stringify([webmention], null, 2)); return; } const entries = JSON.parse(fs.readFileSync(filename)) .filter(wm => wm["wm-id"] !== webmention["wm-id"]) .concat([webmention]); entries.sort((a, b) => a["wm-id"] - b["wm-id"]); fs.writeFileSync(filename, JSON.stringify(entries, null, 2)); }); }); function fetchWebmentions() { const token = process.env.WEBMENTIONS_TOKEN; const since = new Date(); since.setDate(since.getDate() - 3); const url = "https://webmention.io/api/mentions.jf2" + "?domain=sebastiandedeyne.com" + `&token=${token}` + `&since=${since.toISOString()}` + "&per-page=999"; return new Promise((resolve, reject) => { https .get(url, res => { let body = ""; res.on("data", chunk => { body += chunk; }); res.on("end", () => { try { resolve(JSON.parse(body)); } catch (error) { reject(error); } }); }) .on("error", error => { reject(error); }); }).then(response => { if (!("children" in response)) { throw new Error("Invalid webmention.io response."); } return response.children; }); }
Running on GitHub Actions
Now that we have our script in place, we want to run it periodically as a GitHub Action. The Action gets stored in a workflow YAML file in the repository.
.github/ workflows/ webmentions.yml
First we need to name it, and determine when it will run. In our case, every 6 hours.
name: Webmentions on: schedule: - cron: "0 */6 * * *"
The cron
syntax is pretty crazy if you're new to it. Crontab Guru is a useful tool to help understand what's going on.
Next, we need to set up the environment. We'll spin up an Ubuntu image, clone the repository and set up Node.js.
name: Webmentions on: schedule: - cron: "0 */6 * * *" webmentions: runs-on: ubuntu-latest steps: - name: Check out repository uses: actions/checkout@master - name: Set up Node.js uses: actions/setup-node@master with: node-version: 12.x
With out image up and running, we can run the webmentions script in the next step.
- name: Fetch webmentions env: WEBMENTIONS_TOKEN: ${{ secrets.WEBMENTIONS_TOKEN }} run: node ./webmentions.js
The WEBMENTIONS_TOKEN
is stored as a secret in the GitHub repository.
All of this is useless without actually persisting the webmentions we fetched. Since we're running in an Ubuntu environment, and we can commit the new webmentions to the repository.
- name: Commit to repository env: GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} COMMIT_MSG: | Fetch webmentions skip-checks: true run: | git config user.email "sebastiandedeyne@gmail.com" git config user.name "Sebastian De Deyne" git remote set-url origin https://x-access-token:${GITHUB_TOKEN}@github.com/sebastiandedeyne/sebastiandedeyne.com.git git checkout master git add . git diff --quiet && git diff --staged --quiet || (git commit -m "${COMMIT_MSG}"; git push origin master)
That last line looks pretty crazy. Translated to human, it means “only commit these changes if there are changes”. There's no need to commit if there are no new webmentions.
Whenever this Action runs and new webmentions are added, the commit triggers a deploy on Netlify, and my live site is up to date!
name: Webmentions on: schedule: - cron: "0 */6 * * *" jobs: webmentions: runs-on: ubuntu-latest steps: - name: Check out repository uses: actions/checkout@master - name: Set up Node.js uses: actions/setup-node@master with: node-version: 12.x - name: Fetch webmentions env: WEBMENTIONS_TOKEN: ${{ secrets.WEBMENTIONS_TOKEN }} run: node ./webmentions.js - name: Commit to repository env: GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} COMMIT_MSG: | Fetch webmentions skip-checks: true run: | git config user.email "sebastiandedeyne@gmail.com" git config user.name "Sebastian De Deyne" git remote set-url origin https://x-access-token:${GITHUB_TOKEN}@github.com/sebastiandedeyne/sebastiandedeyne.com.git git checkout master git add . git diff --quiet && git diff --staged --quiet || (git commit -m "${COMMIT_MSG}"; git push origin master)
Now that everything's set up, commits our pouring in with freshly fetched webmentions!
以上所述就是小编给大家介绍的《Webmentions on a static site with GitHub Actions》,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对 码农网 的支持!
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