feat(cli): allow to inspect Penpot URLs

packages/cli/package.json

@@ -12,6 +12,8 @@
   "scripts": {
     "prepack": "npm run build",
     "build": "tsc",
+    "pretest": "npm run build",
+    "test": "node --test",
     "format": "prettier -w .",
     "dev": "tsc-watch"
   },

packages/cli/src/bin/index.ts

@@ -4,16 +4,61 @@ import fs from 'node:fs'
 import path from 'node:path'
 import penpotExport from '@penpot-export/core'
 
-const rootProjectPath = fs.realpathSync(process.cwd())
-const configFilePath = path.resolve(rootProjectPath, 'penpot-export.config.js')
-const exists = fs.existsSync(configFilePath)
+import { parsePenpotUrl } from '../penpot'
 
-if (!exists) {
-  throw new Error(
-    'penpot-export: Config file not found. Check if file penpot-export.config.js exists at root.',
-  )
+const [, , command, ...params] = process.argv
+
+switch (command) {
+  case 'inspect': {
+    const [url] = params
+
+    if (!url) {
+      throw new Error(
+        'penpot-export: Missing URL to inspect. Provide an URL to the inspect command.',
+      )
+    }
+
+    try {
+      const parsed = parsePenpotUrl(url)
+      console.log(
+        [
+          'The following details are the result of inspecting the provided URL:',
+          `Penpot instance: ${parsed.instance}`,
+          `Workspace id: ${parsed.workspaceId}`,
+          `File id: ${parsed.fileId}`,
+          `Page id: ${parsed.pageId}`,
+        ].join('\n\t'),
+      )
+    } catch (e) {
+      if (e instanceof TypeError) {
+        throw new Error(
+          `penpot-export: URL inspection failed with the following error: ${e.message}.`,
+        )
+      } else {
+        throw new Error(
+          'penpot-export: URL inspection failed with an unknown error.',
+        )
+      }
+    }
+
+    break
+  }
+  default: {
+    const rootProjectPath = fs.realpathSync(process.cwd())
+    const configFilePath = path.resolve(
+      rootProjectPath,
+      'penpot-export.config.js',
+    )
+    const exists = fs.existsSync(configFilePath)
+
+    if (!exists) {
+      throw new Error(
+        'penpot-export: Config file not found. Check if file penpot-export.config.js exists at root.',
+      )
+    }
+
+    const config = require(configFilePath)
+
+    penpotExport(config, rootProjectPath)
+  }
 }
-
-const config = require(configFilePath)
-
-penpotExport(config, rootProjectPath)

packages/cli/src/penpot/index.ts

@@ -0,0 +1 @@
+export * from './urls'

packages/cli/src/penpot/urls.test.ts

@@ -0,0 +1,115 @@
+import assert from 'node:assert'
+import { describe, it } from 'node:test'
+
+import { parsePenpotUrl } from './urls'
+
+describe('Penpot URL parser', () => {
+  describe('Params validation', () => {
+    describe('when provided an invalid URL', () => {
+      it('throws an error', () => {
+        const input = 'foo'
+
+        const expectedException = {
+          name: 'TypeError',
+          message: 'Invalid URL',
+        }
+
+        assert.throws(() => {
+          parsePenpotUrl(input)
+        }, expectedException)
+      })
+    })
+
+    describe('when provided a valid URL not from a Penpot file', () => {
+      it('throws an error', () => {
+        {
+          const input = 'https://design.penpot.app/#/settings/profile'
+
+          const expectedException = {
+            name: 'TypeError',
+            message: 'Invalid Penpot file URL',
+          }
+
+          assert.throws(() => {
+            parsePenpotUrl(input)
+          }, expectedException)
+        }
+
+        {
+          const input = 'https://design.penpot.app/#/settings/access-tokens'
+
+          const expectedException = {
+            name: 'TypeError',
+            message: 'Invalid Penpot file URL',
+          }
+
+          assert.throws(() => {
+            parsePenpotUrl(input)
+          }, expectedException)
+        }
+      })
+    })
+  })
+
+  describe('Parsing output', () => {
+    describe('when provided a Penpot SaaS URL', () => {
+      it('parses it without page-id param', () => {
+        const input =
+          'https://design.penpot.app/#/workspace/4a499800-872e-80e1-8002-fc0b4bbaa4e4/52961d58-0a92-80c2-8003-2e4b5e9a7826'
+
+        const expect = {
+          instance: 'https://design.penpot.app/',
+          workspaceId: '4a499800-872e-80e1-8002-fc0b4bbaa4e4',
+          fileId: '52961d58-0a92-80c2-8003-2e4b5e9a7826',
+          pageId: undefined,
+        }
+
+        assert.deepStrictEqual(parsePenpotUrl(input), expect)
+      })
+
+      it('parses it with page id', () => {
+        const input =
+          'https://design.penpot.app/#/workspace/4a499800-872e-80e1-8002-fc0b4bbaa4e4/52961d58-0a92-80c2-8003-2e4b5e9a7826?page-id=38f1e350-296d-80f1-8002-fd3314270d8c'
+
+        const expect = {
+          instance: 'https://design.penpot.app/',
+          workspaceId: '4a499800-872e-80e1-8002-fc0b4bbaa4e4',
+          fileId: '52961d58-0a92-80c2-8003-2e4b5e9a7826',
+          pageId: '38f1e350-296d-80f1-8002-fd3314270d8c',
+        }
+
+        assert.deepStrictEqual(parsePenpotUrl(input), expect)
+      })
+    })
+
+    describe('when provided a self-hosted Penpot URL', () => {
+      it('parses it without page-id param', () => {
+        const input =
+          'https://penpot.mydomain.com/#/workspace/da54e491-6ba3-11eb-9ba1-03f8ac143bbf/c86728dd-89fd-8169-8002-a71575166a74'
+
+        const expect = {
+          instance: 'https://penpot.mydomain.com/',
+          workspaceId: 'da54e491-6ba3-11eb-9ba1-03f8ac143bbf',
+          fileId: 'c86728dd-89fd-8169-8002-a71575166a74',
+          pageId: undefined,
+        }
+
+        assert.deepStrictEqual(parsePenpotUrl(input), expect)
+      })
+
+      it('parses it with page id', () => {
+        const input =
+          'https://penpot.mydomain.com/#/workspace/da54e491-6ba3-11eb-9ba1-03f8ac143bbf/c86728dd-89fd-8169-8002-a71575166a74?page-id=c86728dd-89fd-8169-8002-a71575166a75'
+
+        const expect = {
+          instance: 'https://penpot.mydomain.com/',
+          workspaceId: 'da54e491-6ba3-11eb-9ba1-03f8ac143bbf',
+          fileId: 'c86728dd-89fd-8169-8002-a71575166a74',
+          pageId: 'c86728dd-89fd-8169-8002-a71575166a75',
+        }
+
+        assert.deepStrictEqual(parsePenpotUrl(input), expect)
+      })
+    })
+  })
+})

packages/cli/src/penpot/urls.ts

@@ -0,0 +1,26 @@
+// NOTE A Penpot file URL has these forms as of v1.19:
+//  https://<origin>/#/workspace/<workspace-uuid>/<file-uuid>
+//  https://<origin>/#/workspace/<workspace-uuid>/<file-uuid>?page-id=<page-uuid>
+const PENPOT_FILE_URL_HASH_RE = /#\/workspace\/.{36}\/.{36}(?:\?page-id=.{36})?/
+
+const UUID_RE =
+  /^\p{Hex_Digit}{8}-\p{Hex_Digit}{4}-\p{Hex_Digit}{4}-\p{Hex_Digit}{4}-\p{Hex_Digit}{12}$/u
+
+export function parsePenpotUrl(url: string) {
+  const parsedUrl = new URL(url)
+
+  if (!PENPOT_FILE_URL_HASH_RE.test(parsedUrl.hash)) {
+    throw new TypeError('Invalid Penpot file URL')
+  }
+
+  const [workspaceId, fileId, pageId] = parsedUrl.hash
+    .split(/[\/?=]/)
+    .filter((match) => UUID_RE.test(match))
+
+  return {
+    instance: parsedUrl.origin + parsedUrl.pathname,
+    workspaceId,
+    fileId,
+    pageId,
+  }
+}