🎉 Initial commit

.gitignore

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+.idea
+data
+config.js

main.js

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+import axios from 'https://cdn.jsdelivr.net/npm/axios@1.1.3/dist/esm/axios.min.js';
+import axiosFetchAdapter from 'https://jspm.dev/@vespaiach/axios-fetch-adapter@0.3.1';
+import pogo from 'https://deno.land/x/pogo@v0.5.2/main.ts';
+import {
+    createServerHelper
+} from 'https://git.kaki87.net/KaKi87/pogo-helpers/raw/commit/c09bb256d310dad935c9406c322a896b7898fa66/mod.js';
+import Joi from 'https://jspm.dev/joi@17.6.1';
+import * as semver from 'https://deno.land/std@0.161.0/semver/mod.ts';
+
+import {
+    port
+} from './config.js';
+
+axios.defaults.adapter = axiosFetchAdapter;
+
+const
+    server = pogo.server({
+        port
+    }),
+    {
+        createRoute
+    } = createServerHelper(
+        server,
+        {
+            isCors: true,
+            onError: error => console.error(error)
+        }
+    );
+
+createRoute({
+    method: 'GET',
+    path: '/update/{owner}/{repo}/{target}/{currentVersion}',
+    schema: Joi.object({
+        path: Joi.object({
+            owner: Joi.string().required(),
+            repo: Joi.string().required(),
+            target: Joi.string().required().valid('linux'),
+            currentVersion: Joi.string().required().custom((value, helpers) => semver.valid(value) ? value : helpers.error('any.invalid'))
+        }),
+        params: Joi.object()
+    }),
+    handler: async (
+        request,
+        h,
+        {
+            path,
+            response
+        }
+    ) => {
+        const
+            {
+                owner,
+                repo,
+                target,
+                currentVersion
+            } = path,
+            {
+                [owner]: {
+                    [repo]: {
+                        host
+                    } = {}
+                } = {}
+            } = JSON.parse(await Deno.readTextFile('./data/repos.json') || '{}');
+        if(host){
+            const
+                assetNameSuffix = {
+                    'linux': '_amd64.AppImage.tar.gz',
+                    'windows': '_x64.msi.zip'
+                }[target],
+                getSignatureAsset = release => release['assets'].find(asset => asset.name.endsWith(`${assetNameSuffix}.sig`)),
+                getTargetAsset = release => release['assets'].find(asset => asset.name.endsWith(assetNameSuffix)),
+                release = (await axios({
+                    baseURL: `https://${host}/api/v1`,
+                    url: `/repos/${owner}/${repo}/releases`
+                })).data.find(release =>
+                    semver.gt(release['tag_name'], currentVersion)
+                    &&
+                    getSignatureAsset(release)
+                    &&
+                    getTargetAsset(release)
+                );
+            if(release){
+                response.body = {
+                    'url': getTargetAsset(release)['browser_download_url'],
+                    'version': release['tag_name'],
+                    'notes': release['body'],
+                    'pub_date': release['published_at'],
+                    'signature': (await axios(getSignatureAsset(release)['browser_download_url'])).data
+                };
+            }
+            else
+                response.code(204);
+        }
+        else
+            response.code(404);
+        return response;
+    }
+});
+
+server.start();