Adding a new convert markdown-to-html block that's powered by the GitHub API (#1)

Created a GitHub API block to handle Markdown-to-HTML conversion.
Includes a simple (and somewhat sloppy)  node HTTP wrapper.

Author: matthewhudson

blocks/convert-markdown-to-html/index.js

@@ -0,0 +1,36 @@
+const { post } = require('../../helpers/http')
+const { Block } = require('node-webpipe')
+
+new Block()
+  .name('Convert Markdown to HTML')
+  .description('Determine whether or not a hostname exists.')
+  .input(
+    'text',
+    'string',
+    'Required. The Markdown text to render in HTML. Markdown content must be 400 KB or less.'
+  )
+  .input(
+    'mode',
+    'string',
+    'The rendering mode. Can be either: [`gfm`,`markdown`]'
+  )
+  .input(
+    'context',
+    'string',
+    'The repository context to use when creating references in gfm mode. Omit this parameter when using markdown mode.'
+  )
+  .output(
+    'html',
+    'string',
+    'Returns an HTML version preferred flavor of Markdown.'
+  )
+  .handle(async function (inputs, cb) {
+    const options = {
+      hostname: 'api.github.com',
+      path: '/markdown',
+      method: 'POST'
+    }
+    const html = await post(options, inputs)
+    cb(null, { html })
+  })
+  .listen()

helpers/http.js

@@ -0,0 +1,35 @@
+const https = require('https')
+
+const post = (options, params) => {
+  const paramsified = JSON.stringify(params)
+  options.headers = {
+    'Content-Type': 'text/plain',
+    'Content-Length': Buffer.byteLength(paramsified),
+    'User-Agent': 'WebPipes-Block-Examples'
+  }
+  return new Promise((resolve, reject) => {
+    const req = https.request(options, res => {
+      let body = ''
+      res.setEncoding('utf8')
+      res.on('data', chunk => (body += chunk.toString()))
+      res.on('error', reject)
+      res.on('end', () => {
+        if (res.statusCode >= 200 && res.statusCode <= 299) {
+          resolve(body)
+        } else {
+          reject(`Request failed. status: ${res.statusCode}, body: ${body}`)
+        }
+      })
+    })
+
+    req.on('error', e => {
+      console.error(`problem with request: ${e.message}`)
+    })
+
+    req.write(paramsified)
+    req.end()
+  })
+}
+const get = (options, params) => {}
+
+module.exports = { get, post }