1 files changed, 144 insertions, 0 deletions
diff --git a/web_src/js/utils.js b/web_src/js/utils.js
new file mode 100644
index 0000000..ce0fb66
--- /dev/null
+++ b/web_src/js/utils.js
@@ -0,0 +1,144 @@
+import {encode, decode} from 'uint8-to-base64';
+
+// transform /path/to/file.ext to file.ext
+export function basename(path = '') {
+  const lastSlashIndex = path.lastIndexOf('/');
+  return lastSlashIndex < 0 ? path : path.substring(lastSlashIndex + 1);
+}
+
+// transform /path/to/file.ext to .ext
+export function extname(path = '') {
+  const lastPointIndex = path.lastIndexOf('.');
+  return lastPointIndex < 0 ? '' : path.substring(lastPointIndex);
+}
+
+// test whether a variable is an object
+export function isObject(obj) {
+  return Object.prototype.toString.call(obj) === '[object Object]';
+}
+
+// returns whether a dark theme is enabled
+export function isDarkTheme() {
+  const style = window.getComputedStyle(document.documentElement);
+  return style.getPropertyValue('--is-dark-theme').trim().toLowerCase() === 'true';
+}
+
+// strip <tags> from a string
+export function stripTags(text) {
+  return text.replace(/<[^>]*>?/g, '');
+}
+
+export function parseIssueHref(href) {
+  const path = (href || '').replace(/[#?].*$/, '');
+  const [_, owner, repo, type, index] = /([^/]+)\/([^/]+)\/(issues|pulls)\/([0-9]+)/.exec(path) || [];
+  return {owner, repo, type, index};
+}
+
+// parse a URL, either relative '/path' or absolute 'https://localhost/path'
+export function parseUrl(str) {
+  return new URL(str, str.startsWith('http') ? undefined : window.location.origin);
+}
+
+// return current locale chosen by user
+export function getCurrentLocale() {
+  return document.documentElement.lang;
+}
+
+// given a month (0-11), returns it in the documents language
+export function translateMonth(month) {
+  return new Date(Date.UTC(2022, month, 12)).toLocaleString(getCurrentLocale(), {month: 'short', timeZone: 'UTC'});
+}
+
+// given a weekday (0-6, Sunday to Saturday), returns it in the documents language
+export function translateDay(day) {
+  return new Date(Date.UTC(2022, 7, day)).toLocaleString(getCurrentLocale(), {weekday: 'short', timeZone: 'UTC'});
+}
+
+// convert a Blob to a DataURI
+export function blobToDataURI(blob) {
+  return new Promise((resolve, reject) => {
+    try {
+      const reader = new FileReader();
+      reader.addEventListener('load', (e) => {
+        resolve(e.target.result);
+      });
+      reader.addEventListener('error', () => {
+        reject(new Error('FileReader failed'));
+      });
+      reader.readAsDataURL(blob);
+    } catch (err) {
+      reject(err);
+    }
+  });
+}
+
+// convert image Blob to another mime-type format.
+export function convertImage(blob, mime) {
+  return new Promise(async (resolve, reject) => {
+    try {
+      const img = new Image();
+      const canvas = document.createElement('canvas');
+      img.addEventListener('load', () => {
+        try {
+          canvas.width = img.naturalWidth;
+          canvas.height = img.naturalHeight;
+          const context = canvas.getContext('2d');
+          context.drawImage(img, 0, 0);
+          canvas.toBlob((blob) => {
+            if (!(blob instanceof Blob)) return reject(new Error('imageBlobToPng failed'));
+            resolve(blob);
+          }, mime);
+        } catch (err) {
+          reject(err);
+        }
+      });
+      img.addEventListener('error', () => {
+        reject(new Error('imageBlobToPng failed'));
+      });
+      img.src = await blobToDataURI(blob);
+    } catch (err) {
+      reject(err);
+    }
+  });
+}
+
+export function toAbsoluteUrl(url) {
+  if (url.startsWith('http://') || url.startsWith('https://')) {
+    return url;
+  }
+  if (url.startsWith('//')) {
+    return `${window.location.protocol}${url}`; // it's also a somewhat absolute URL (with the current scheme)
+  }
+  if (url && !url.startsWith('/')) {
+    throw new Error('unsupported url, it should either start with / or http(s)://');
+  }
+  return `${window.location.origin}${url}`;
+}
+
+// Encode an ArrayBuffer into a URLEncoded base64 string.
+export function encodeURLEncodedBase64(arrayBuffer) {
+  return encode(arrayBuffer)
+    .replace(/\+/g, '-')
+    .replace(/\//g, '_')
+    .replace(/=/g, '');
+}
+
+// Decode a URLEncoded base64 to an ArrayBuffer string.
+export function decodeURLEncodedBase64(base64url) {
+  return decode(base64url
+    .replace(/_/g, '/')
+    .replace(/-/g, '+'));
+}
+
+const domParser = new DOMParser();
+const xmlSerializer = new XMLSerializer();
+
+export function parseDom(text, contentType) {
+  return domParser.parseFromString(text, contentType);
+}
+
+export function serializeXml(node) {
+  return xmlSerializer.serializeToString(node);
+}
+
+export const sleep = (ms) => new Promise((resolve) => setTimeout(resolve, ms));