From d61e3f8422a8c1d5e4635a39a7e8f7f05942d9b7 Mon Sep 17 00:00:00 2001
From: Aditya Hegde <adityahegderocks@gmail.com>
Date: Mon, 3 Feb 2025 18:56:34 +0530
Subject: [PATCH] feat: file upload input (#6487)

* Basic FileInput

* Add error state

* Add drag-drop support

* Add drop-over state and loading state

* Fix lint

* Add preview
---
 .../src/components/forms/FileInput.svelte     | 172 ++++++++++++++++++
 .../src/components/icons/Attachment.svelte    |  19 ++
 2 files changed, 191 insertions(+)
 create mode 100644 web-common/src/components/forms/FileInput.svelte
 create mode 100644 web-common/src/components/icons/Attachment.svelte

diff --git a/web-common/src/components/forms/FileInput.svelte b/web-common/src/components/forms/FileInput.svelte
new file mode 100644
index 00000000000..b97bab9751d
--- /dev/null
+++ b/web-common/src/components/forms/FileInput.svelte
@@ -0,0 +1,172 @@
+<script lang="ts">
+  import LoadingSpinner from "@rilldata/web-common/components/icons/LoadingSpinner.svelte";
+  import Viz from "@rilldata/web-common/components/icons/Viz.svelte";
+
+  export let value: string | string[] | undefined = undefined;
+  export let error: string | Record<string | number, string[]> | undefined =
+    undefined;
+  export let multiple: boolean = false;
+  export let accept: string | undefined = undefined;
+  // Currently we upload either to runtime or cloud.
+  // Implementation of it will be upto the caller of this component.
+  export let uploadFile: (file: File) => Promise<string>;
+
+  $: values = value ? (multiple ? (value as string[]) : [value as string]) : [];
+  $: errors = error ? (multiple ? error : { 0: error }) : [];
+
+  $: uploading = {};
+  $: uploadErrors = {};
+  let fileInput: HTMLInputElement;
+
+  // maintain a list of filenames to show in error messages.
+  // since the final uploaded url set in `value` is usually not the same this is needed.
+  let fileNames: string[] = value
+    ? multiple
+      ? (value as string[])
+      : [value as string]
+    : [];
+  $: hasValue = values.length > 0 || Object.values(uploading).some((u) => u);
+
+  function uploadFiles(files: FileList) {
+    uploading = {};
+    uploadErrors = {};
+    if (multiple) {
+      value = new Array(files.length).fill("");
+      fileNames = new Array<string>(files.length).fill("");
+    } else {
+      value = "";
+      fileNames = [""];
+    }
+    for (let i = 0; i < files.length; i++) {
+      void uploadFileWrapper(files[i], i);
+    }
+  }
+
+  async function uploadFileWrapper(file: File, i: number) {
+    uploading[i] = true;
+    try {
+      fileNames[i] = file.name;
+      const url = await uploadFile(file);
+      if (multiple) {
+        if (value === undefined) {
+          value = [];
+        }
+        (value as string[])[i] = url;
+      } else {
+        value = url;
+      }
+    } catch (err) {
+      uploadErrors[i] = err.message;
+    }
+    uploading[i] = false;
+  }
+
+  function handleInput() {
+    if (!fileInput.files) return;
+    uploadFiles(fileInput.files);
+  }
+
+  function handleFileDrop(event: DragEvent) {
+    dragOver = false;
+
+    if (!event.dataTransfer?.files?.length) return;
+    uploadFiles(event.dataTransfer.files);
+  }
+
+  let dragOver = false;
+  $: errorMessages = Object.values({
+    ...(errors as Record<string, any>),
+    ...uploadErrors,
+  })
+    .map((e, i) => (fileNames[i] && e ? `${fileNames[i]}:${e}` : ""))
+    .filter(Boolean);
+</script>
+
+<div class="container grid">
+  <button
+    class="upload-button"
+    on:click={() => fileInput.click()}
+    on:dragenter|preventDefault|stopPropagation={() => (dragOver = true)}
+    on:dragleave|preventDefault|stopPropagation={() => (dragOver = false)}
+    on:dragover|preventDefault|stopPropagation
+    on:drop|preventDefault={handleFileDrop}
+    class:bg-neutral-100={!dragOver}
+    class:bg-primary-100={dragOver}
+  >
+    {#if hasValue}
+      <div class="upload-preview">
+        {#each fileNames as _, i (i)}
+          {@const isUploading = !!uploading[i]}
+          {@const hasError =
+            (!!uploadErrors[i] || !!errors?.[i]) && !isUploading}
+          {@const val = values[i]}
+          {#if (val || isUploading) && !hasError}
+            <div class="border border-neutral-400 p-1">
+              {#if isUploading}
+                <LoadingSpinner size="36px" />
+              {:else}
+                <img src={val} alt="upload" class="h-10 w-fit" />
+              {/if}
+            </div>
+          {/if}
+        {/each}
+      </div>
+    {:else}
+      <Viz size="28px" class="text-gray-400 pointer-events-none" />
+      <div class="container-flex-col pointer-events-none">
+        <span class="upload-title"> Upload an image </span>
+        {#if multiple}
+          <span class="upload-description">
+            Support for a single or bulk upload.
+          </span>
+        {/if}
+      </div>
+    {/if}
+  </button>
+  {#if errorMessages.length > 0}
+    <div class="error">
+      {#each errorMessages as errorMessage, i (i)}
+        <div>{errorMessage}</div>
+      {/each}
+    </div>
+  {/if}
+  <input
+    type="file"
+    {accept}
+    hidden
+    {multiple}
+    bind:this={fileInput}
+    on:input={handleInput}
+  />
+</div>
+
+<style lang="postcss">
+  .container {
+    @apply flex flex-col gap-y-2;
+  }
+
+  .container-flex-col {
+    @apply flex flex-col;
+  }
+
+  .upload-button {
+    @apply flex flex-row gap-x-2.5 items-center justify-center py-5 min-h-10 w-80;
+    @apply border border-neutral-400;
+  }
+
+  .upload-title {
+    @apply text-sm font-medium text-left text-gray-500;
+  }
+
+  .upload-description {
+    @apply text-xs font-normal text-gray-400;
+  }
+
+  .upload-preview {
+    @apply flex flex-wrap w-full gap-x-1 items-center justify-center pointer-events-none px-4;
+  }
+
+  .error {
+    @apply text-red-600 text-xs py-px mt-0.5;
+  }
+</style>
diff --git a/web-common/src/components/icons/Attachment.svelte b/web-common/src/components/icons/Attachment.svelte
new file mode 100644
index 00000000000..e9481bff9e1
--- /dev/null
+++ b/web-common/src/components/icons/Attachment.svelte
@@ -0,0 +1,19 @@
+<script>
+  export let size = "1em";
+  export let color = "currentColor";
+  export let className = "";
+</script>
+
+<svg
+  height={size}
+  viewBox="0 0 14 14"
+  fill={color}
+  xmlns="http://www.w3.org/2000/svg"
+  class={className}
+>
+  <path
+    d="M11.1766 2.07461C9.7047 0.602734 7.30783 0.602734 5.83751 2.07461L1.75939 6.14961C1.73283 6.17617 1.71876 6.21211 1.71876 6.24961C1.71876 6.28711 1.73283 6.32305 1.75939 6.34961L2.33595 6.92617C2.36231 6.95241 2.39798 6.96714 2.43517 6.96714C2.47236 6.96714 2.50804 6.95241 2.53439 6.92617L6.61251 2.85117C7.11877 2.34492 7.7922 2.0668 8.50783 2.0668C9.22345 2.0668 9.89689 2.34492 10.4016 2.85117C10.9078 3.35742 11.186 4.03086 11.186 4.74492C11.186 5.46055 10.9078 6.13242 10.4016 6.63867L6.24533 10.7934L5.57189 11.4668C4.9422 12.0965 3.91876 12.0965 3.28908 11.4668C2.98439 11.1621 2.8172 10.7574 2.8172 10.3262C2.8172 9.89492 2.98439 9.49024 3.28908 9.18555L7.41252 5.06367C7.5172 4.96055 7.6547 4.90273 7.80158 4.90273H7.80314C7.95002 4.90273 8.08595 4.96055 8.18908 5.06367C8.29376 5.16836 8.35002 5.30586 8.35002 5.45273C8.35002 5.59805 8.2922 5.73555 8.18908 5.83867L4.81876 9.20586C4.7922 9.23242 4.77814 9.26836 4.77814 9.30586C4.77814 9.34336 4.7922 9.3793 4.81876 9.40586L5.39533 9.98242C5.42168 10.0087 5.45736 10.0234 5.49455 10.0234C5.53174 10.0234 5.56741 10.0087 5.59377 9.98242L8.96251 6.61367C9.27345 6.30273 9.44377 5.89023 9.44377 5.45117C9.44377 5.01211 9.27189 4.59805 8.96251 4.28867C8.32033 3.64648 7.27658 3.64805 6.63439 4.28867L6.23439 4.69023L2.51251 8.41055C2.25991 8.66167 2.05967 8.96045 1.92341 9.28956C1.78716 9.61866 1.7176 9.97154 1.71876 10.3277C1.71876 11.0512 2.00158 11.7309 2.51251 12.2418C3.0422 12.7699 3.73595 13.034 4.4297 13.034C5.12345 13.034 5.8172 12.7699 6.34533 12.2418L11.1766 7.41367C11.8875 6.70117 12.2813 5.75273 12.2813 4.74492C12.2828 3.73555 11.8891 2.78711 11.1766 2.07461Z"
+    fill="black"
+    fill-opacity="0.45"
+  />
+</svg>