fix: handle unicode filename and website uploads (#491)

* fix: print meaningful error message for invalid filenames

* fix: handle unicode dirnames and filenames

* chore: revert custom error message

ui-test/test-case/UnicodeFileUpload.js

@@ -0,0 +1,33 @@
+const puppeteer = require('puppeteer')
+const { selectStampAndUpload } = require('../helpers')
+const { Assert, Click } = require('../library')
+
+/**
+ * @param {puppeteer.Page} page Puppeteer Page object returned by `browser.newPage()`
+ */
+async function testUnicodeFileUpload(page) {
+  await Click.elementWithText(page, 'a', 'Files')
+  await Click.elementWithTextAndUpload(page, 'button', 'Add File', 'test-data/—𝖆𝖆🙇\\𝖈𝖈.txt')
+  await assertUploadPreview(page)
+  await selectStampAndUpload(page)
+  await assertDownloadPreview(page)
+}
+
+/**
+ * @param {puppeteer.Page} page Puppeteer Page object returned by `browser.newPage()`
+ */
+async function assertUploadPreview(page) {
+  await Assert.elementWithTextExists(page, 'p', 'Filename: —𝖆𝖆🙇\\𝖈𝖈.txt')
+  await Assert.elementWithTextExists(page, 'p', 'Kind: text/plain')
+  await Assert.elementWithTextExists(page, 'p', 'Size: 5.51 kB')
+}
+
+/**
+ * @param {puppeteer.Page} page Puppeteer Page object returned by `browser.newPage()`
+ */
+async function assertDownloadPreview(page) {
+  assertUploadPreview(page)
+  await Assert.elementWithTextExists(page, 'p', 'Swarm Hash: 30fbf1d2[…]ba400e86')
+}
+
+module.exports = { testUnicodeFileUpload }