https-request: optionally log the corresponding curl calls

It is often exceedingly tedious to reproduce webhook delivery failures,
even though we now have a convenient script that finds the webhook
corresponding to a failed slash command.

Let's introduce an option (guarded by an environment variable) to log
the exact `curl` call to reproduce the call that might have failed.

This is guarded by default essentially for one reason: It also includes
the authorization token, unredacted, which would be unsafe by default.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Author: dscho

GitForWindowsHelper/https-request.js

@@ -18,6 +18,17 @@ const httpsRequest = async (context, hostname, method, requestPath, body, header
         path: requestPath,
         headers
     }
+    if (process.env.LOG_HTTPS_REQUESTS === 'true') {
+        const quote = s => !s.match(/[\][.?*\\^_"'`{}()<>@~&+:;$%"; // \t\r\n]/) ? s : `'${s.replace(/'/g, "'\\''")}'`
+        const commandLine = [
+            'curl',
+            options.method === 'GET' ? '' : `-X ${options.method}`,
+            ...Object.entries(options.headers).map(([key, value]) => `-H ${quote(`${key}: ${value}`)}`),
+            body ? `-d ${quote(body)}` : '',
+            `https://${options.hostname}${options.path}`,
+        ].filter(e => e).join(' ')
+        ;(context.error || console.error)(commandLine)
+    }
     return new Promise((resolve, reject) => {
         try {
             const https = require('https')