Area restrita - Questionario

node_modules/nanoid/index.browser.js

@@ -1,34 +1,47 @@
-import { urlAlphabet } from './url-alphabet/index.js'
-let random = bytes => crypto.getRandomValues(new Uint8Array(bytes))
-let customRandom = (alphabet, defaultSize, getRandom) => {
-  let mask = (2 << (Math.log(alphabet.length - 1) / Math.LN2)) - 1
-  let step = -~((1.6 * mask * defaultSize) / alphabet.length)
+/* @ts-self-types="./index.d.ts" */
+import { urlAlphabet as scopedUrlAlphabet } from './url-alphabet/index.js'
+export { urlAlphabet } from './url-alphabet/index.js'
+export let random = bytes => crypto.getRandomValues(new Uint8Array(bytes))
+export let customRandom = (alphabet, defaultSize, getRandom) => {
+  let safeByteCutoff = 256 - (256 % alphabet.length)
+  if (safeByteCutoff === 256) {
+    let mask = alphabet.length - 1
+    return (size = defaultSize) => {
+      if (!size) return ''
+      let id = ''
+      while (true) {
+        let bytes = getRandom(size)
+        let j = size
+        while (j--) {
+          id += alphabet[bytes[j] & mask]
+          if (id.length >= size) return id
+        }
+      }
+    }
+  }
+  let step = Math.ceil((1.6 * 256 * defaultSize) / safeByteCutoff)
   return (size = defaultSize) => {
+    if (!size) return ''
     let id = ''
     while (true) {
       let bytes = getRandom(step)
-      let j = step | 0
+      let j = step
       while (j--) {
-        id += alphabet[bytes[j] & mask] || ''
-        if (id.length === size) return id
+        if (bytes[j] < safeByteCutoff) {
+          id += alphabet[bytes[j] % alphabet.length]
+          if (id.length >= size) return id
+        }
       }
     }
   }
 }
-let customAlphabet = (alphabet, size = 21) =>
-  customRandom(alphabet, size, random)
-let nanoid = (size = 21) =>
-  crypto.getRandomValues(new Uint8Array(size)).reduce((id, byte) => {
-    byte &= 63
-    if (byte < 36) {
-      id += byte.toString(36)
-    } else if (byte < 62) {
-      id += (byte - 26).toString(36).toUpperCase()
-    } else if (byte > 62) {
-      id += '-'
-    } else {
-      id += '_'
-    }
-    return id
-  }, '')
-export { nanoid, customAlphabet, customRandom, urlAlphabet, random }
+export let customAlphabet = (alphabet, size = 21) =>
+  customRandom(alphabet, size | 0, random)
+export let nanoid = (size = 21) => {
+  let id = ''
+  let bytes = crypto.getRandomValues(new Uint8Array((size |= 0)))
+  while (size--) {
+    id += scopedUrlAlphabet[bytes[size] & 63]
+  }
+  return id
+}