Refactor authentication code; add OIDC support

services/web/modules/authentication/utils.mjs

@@ -0,0 +1,42 @@
+import fs from 'fs'
+function readFilesContentFromEnv(envVar) {
+// envVar is either a file name: 'file.pem', or string with array: '["file.pem", "file2.pem"]'
+  if (!envVar) return undefined
+  try {
+    const parsedFileNames = JSON.parse(envVar)
+    return parsedFileNames.map(filename => fs.readFileSync(filename, 'utf8'))
+  } catch (error) {
+    if (error instanceof SyntaxError) { // failed to parse, envVar must be a file name
+      return fs.readFileSync(envVar, 'utf8')
+    } else {
+      throw error
+    }
+  }
+}
+function numFromEnv(env) {
+  return env ? Number(env) : undefined
+}
+function boolFromEnv(env) {
+  if (env === undefined || env === null) return undefined
+  if (typeof env === "string") {
+    const envLower = env.toLowerCase()
+    if (envLower === 'true') return true
+    if (envLower === 'false') return false
+  }
+  throw new Error("Invalid value for boolean envirionment variable")
+}
+
+function splitFullName(fullName) {
+  fullName = fullName.trim();
+  let lastSpaceIndex = fullName.lastIndexOf(' ');
+  let firstNames = fullName.substring(0, lastSpaceIndex).trim();
+  let lastName = fullName.substring(lastSpaceIndex + 1).trim();
+  return [firstNames, lastName];
+}
+
+export {
+  readFilesContentFromEnv,
+  numFromEnv,
+  boolFromEnv,
+  splitFullName,
+}