feat(TextareaCopyable/FormatTransformer): add download button prop

src/components/FormatTransformer.vue

@@ -1,7 +1,9 @@
 <script setup lang="ts">
 import _ from 'lodash';
+import { Base64 } from 'js-base64';
 import type { UseValidationRule } from '@/composable/validation';
 import CInputText from '@/ui/c-input-text/c-input-text.vue';
+import { useDownloadFileFromBase64 } from '@/composable/downloadBase64';
 
 const props = withDefaults(
   defineProps<{
@@ -12,6 +14,8 @@ const props = withDefaults(
     inputDefault?: string
     outputLabel?: string
     outputLanguage?: string
+    downloadFileName?: string
+    downloadButtonText?: string
   }>(),
   {
     transformer: _.identity,
@@ -21,16 +25,27 @@ const props = withDefaults(
     inputPlaceholder: 'Input...',
     outputLabel: 'Output',
     outputLanguage: '',
+    downloadFileName: '',
+    downloadButtonText: 'Download',
   },
 );
 
-const { transformer, inputValidationRules, inputLabel, outputLabel, outputLanguage, inputPlaceholder, inputDefault }
-  = toRefs(props);
+const {
+  transformer, inputValidationRules, inputLabel, outputLabel, outputLanguage,
+  inputPlaceholder, inputDefault, downloadFileName, downloadButtonText,
+} = toRefs(props);
 
 const inputElement = ref<typeof CInputText>();
 
 const input = ref(inputDefault.value);
 const output = computed(() => transformer.value(input.value));
+
+const outputBase64 = computed(() => Base64.encode(output.value));
+const { download } = useDownloadFileFromBase64(
+  {
+    source: outputBase64,
+    filename: downloadFileName,
+  });
 </script>
 
 <template>
@@ -53,5 +68,11 @@ const output = computed(() => transformer.value(input.value));
       {{ outputLabel }}
     </div>
     <textarea-copyable :value="output" :language="outputLanguage" :follow-height-of="inputElement?.inputWrapperRef" />
+
+    <div v-if="downloadFileName !== '' && output !== ''" mt-5 flex justify-center>
+      <c-button secondary @click="download">
+        {{ downloadButtonText }}
+      </c-button>
+    </div>
   </div>
 </template>

src/components/TextareaCopyable.vue

@@ -13,7 +13,9 @@ import jsHljs from 'highlight.js/lib/languages/javascript';
 import cssHljs from 'highlight.js/lib/languages/css';
 import goHljs from 'highlight.js/lib/languages/go';
 import csharpHljs from 'highlight.js/lib/languages/csharp';
+import { Base64 } from 'js-base64';
 import { useCopy } from '@/composable/copy';
+import { useDownloadFileFromBase64 } from '@/composable/downloadBase64';
 
 const props = withDefaults(
   defineProps<{
@@ -23,12 +25,16 @@ const props = withDefaults(
     copyPlacement?: 'top-right' | 'bottom-right' | 'outside' | 'none'
     copyMessage?: string
     wordWrap?: boolean
+    downloadFileName?: string
+    downloadButtonText?: string
   }>(),
   {
     followHeightOf: null,
     language: 'txt',
     copyPlacement: 'top-right',
     copyMessage: 'Copy to clipboard',
+    downloadFileName: '',
+    downloadButtonText: 'Download',
   },
 );
 hljs.registerLanguage('sql', sqlHljs);
@@ -44,11 +50,18 @@ hljs.registerLanguage('javascript', jsHljs);
 hljs.registerLanguage('go', goHljs);
 hljs.registerLanguage('csharp', csharpHljs);
 
-const { value, language, followHeightOf, copyPlacement, copyMessage } = toRefs(props);
+const { value, language, followHeightOf, copyPlacement, copyMessage, downloadFileName, downloadButtonText } = toRefs(props);
 const { height } = followHeightOf.value ? useElementSize(followHeightOf) : { height: ref(null) };
 
 const { copy, isJustCopied } = useCopy({ source: value, createToast: false });
 const tooltipText = computed(() => isJustCopied.value ? 'Copied!' : copyMessage.value);
+
+const valueBase64 = computed(() => Base64.encode(value.value));
+const { download } = useDownloadFileFromBase64(
+  {
+    source: valueBase64,
+    filename: downloadFileName,
+  });
 </script>
 
 <template>
@@ -81,6 +94,11 @@ const tooltipText = computed(() => isJustCopied.value ? 'Copied!' : copyMessage.
         {{ tooltipText }}
       </c-button>
     </div>
+    <div v-if="downloadFileName !== '' && value !== ''" mt-5 flex justify-center>
+      <c-button secondary @click="download">
+        {{ downloadButtonText }}
+      </c-button>
+    </div>
   </div>
 </template>
 

src/composable/downloadBase64.ts

@@ -1,8 +1,14 @@
-import { extension as getExtensionFromMime } from 'mime-types';
-import type { Ref } from 'vue';
+import { extension as getExtensionFromMimeType, extension as getMimeTypeFromExtension } from 'mime-types';
+import type { MaybeRef } from 'vue';
 import _ from 'lodash';
+import { get } from '@vueuse/core';
 
-export { getMimeTypeFromBase64, useDownloadFileFromBase64 };
+export {
+  getMimeTypeFromBase64,
+  getMimeTypeFromExtension, getExtensionFromMimeType,
+  useDownloadFileFromBase64,
+  previewImageFromBase64,
+};
 
 const commonMimeTypesSignatures = {
   'JVBERi0': 'application/pdf',
@@ -36,30 +42,68 @@ function getFileExtensionFromMimeType({
   defaultExtension?: string
 }) {
   if (mimeType) {
-    return getExtensionFromMime(mimeType) ?? defaultExtension;
+    return getExtensionFromMimeType(mimeType) ?? defaultExtension;
   }
 
   return defaultExtension;
 }
 
-function useDownloadFileFromBase64({ source, filename }: { source: Ref<string>; filename?: string }) {
+function downloadFromBase64({ sourceValue, filename, extension, fileMimeType }:
+{ sourceValue: string; filename?: string; extension?: string; fileMimeType?: string }) {
+  if (sourceValue === '') {
+    throw new Error('Base64 string is empty');
+  }
+
+  const defaultExtension = extension ?? 'txt';
+  const { mimeType } = getMimeTypeFromBase64({ base64String: sourceValue });
+  let base64String = sourceValue;
+  if (!mimeType) {
+    const targetMimeType = fileMimeType ?? getMimeTypeFromExtension(defaultExtension);
+    base64String = `data:${targetMimeType};base64,${sourceValue}`;
+  }
+
+  const cleanExtension = extension ?? getFileExtensionFromMimeType(
+    { mimeType, defaultExtension });
+  let cleanFileName = filename ?? `file.${cleanExtension}`;
+  if (extension && !cleanFileName.endsWith(`.${extension}`)) {
+    cleanFileName = `${cleanFileName}.${cleanExtension}`;
+  }
+
+  const a = document.createElement('a');
+  a.href = base64String;
+  a.download = cleanFileName;
+  a.click();
+}
+
+function useDownloadFileFromBase64(
+  { source, filename, extension }:
+  { source: MaybeRef<string>; filename?: MaybeRef<string>; extension?: MaybeRef<string> }) {
   return {
     download() {
-      if (source.value === '') {
-        throw new Error('Base64 string is empty');
-      }
-
-      const { mimeType } = getMimeTypeFromBase64({ base64String: source.value });
-      const base64String = mimeType
-        ? source.value
-        : `data:text/plain;base64,${source.value}`;
-
-      const cleanFileName = filename ?? `file.${getFileExtensionFromMimeType({ mimeType })}`;
-
-      const a = document.createElement('a');
-      a.href = base64String;
-      a.download = cleanFileName;
-      a.click();
+      downloadFromBase64({ sourceValue: get(source), filename: get(filename), extension: get(extension) });
     },
   };
 }
+
+function previewImageFromBase64(base64String: string): HTMLImageElement {
+  if (base64String === '') {
+    throw new Error('Base64 string is empty');
+  }
+
+  const img = document.createElement('img');
+  img.src = base64String;
+
+  const container = document.createElement('div');
+  container.appendChild(img);
+
+  const previewContainer = document.getElementById('previewContainer');
+  if (previewContainer) {
+    previewContainer.innerHTML = '';
+    previewContainer.appendChild(container);
+  }
+  else {
+    throw new Error('Preview container element not found');
+  }
+
+  return img;
+}