FR: #4048 - Add color customization to the chatbot (#4885)

Co-authored-by: crazywoola <427733928@qq.com>

web/app/components/base/chat/embedded-chatbot/theme/utils.ts

@@ -0,0 +1,29 @@
+export function hexToRGBA(hex: string, opacity: number): string {
+  hex = hex.replace('#', '')
+
+  const r = parseInt(hex.slice(0, 2), 16)
+  const g = parseInt(hex.slice(2, 4), 16)
+  const b = parseInt(hex.slice(4, 6), 16)
+
+  // Returning an RGB color object
+  return `rgba(${r},${g},${b},${opacity.toString()})`
+}
+
+/**
+ * Since strings cannot be directly assigned to the 'style' attribute in JSX,
+ * this method transforms the string into an object representation of the styles.
+ */
+export function CssTransform(cssString: string): object {
+  if (cssString.length === 0)
+    return {}
+
+  const style: object = {}
+  const propertyValuePairs = cssString.split(';')
+  for (const pair of propertyValuePairs) {
+    if (pair.trim().length > 0) {
+      const [property, value] = pair.split(':')
+      Object.assign(style, { [property.trim()]: value.trim() })
+    }
+  }
+  return style
+}