[feat] Add Civitai model upload wizard (#6694)

## Summary
Adds a complete model upload workflow that allows users to import models
from Civitai URLs directly into their library.

## Changes
- **Multi-step wizard**: URL input → metadata confirmation → upload
progress
- **Components**: UploadModelDialog, UploadModelUrlInput,
UploadModelConfirmation, UploadModelProgress, UploadModelDialogHeader
- **API integration**: New assetService methods for metadata retrieval
and URL-based uploads
- **Model type management**: useModelTypes composable for fetching and
formatting available model types
- **UX improvements**: Optional validation bypass for UrlInput component
- **Localization**: 26 new i18n strings for the upload workflow

## Review Focus
- Error handling for failed uploads and metadata retrieval
- Model type detection and selection logic
- Dialog state management across multi-step workflow

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6694-feat-Add-Civitai-model-upload-wizard-2ab6d73d36508193b3b1dd67c7cc5a09)
by [Unito](https://www.unito.io)

---------

Co-authored-by: Claude <noreply@anthropic.com>

src/components/common/UrlInput.vue

@@ -35,6 +35,7 @@ import { ValidationState } from '@/utils/validationUtil'
 const props = defineProps<{
   modelValue: string
   validateUrlFn?: (url: string) => Promise<boolean>
+  disableValidation?: boolean
 }>()
 
 const emit = defineEmits<{
@@ -101,6 +102,8 @@ const defaultValidateUrl = async (url: string): Promise<boolean> => {
 }
 
 const validateUrl = async (value: string) => {
+  if (props.disableValidation) return
+
   if (validationState.value === ValidationState.LOADING) return
 
   const url = cleanInput(value)

src/locales/en/main.json

@@ -2076,6 +2076,35 @@
     "noModelsInFolder": "No {type} available in this folder",
     "searchAssetsPlaceholder": "Type to search...",
     "uploadModel": "Upload model",
+    "uploadModelFromCivitai": "Upload a model from Civitai",
+    "uploadModelFailedToRetrieveMetadata": "Failed to retrieve metadata. Please check the link and try again.",
+    "onlyCivitaiUrlsSupported": "Only Civitai URLs are supported",
+    "uploadModelDescription1": "Paste a Civitai model download link to add it to your library.",
+    "uploadModelDescription2": "Only links from https://civitai.com are supported at the moment",
+    "uploadModelDescription3": "Max file size: 1 GB",
+    "civitaiLinkLabel": "Civitai model download link",
+    "civitaiLinkPlaceholder": "Paste link here",
+    "civitaiLinkExample": "Example: https://civitai.com/api/download/models/833921?type=Model&format=SafeTensor",
+    "confirmModelDetails": "Confirm Model Details",
+    "fileName": "File Name",
+    "fileSize": "File Size",
+    "modelName": "Model Name",
+    "modelNamePlaceholder": "Enter a name for this model",
+    "tags": "Tags",
+    "tagsPlaceholder": "e.g., models, checkpoint",
+    "tagsHelp": "Separate tags with commas",
+    "upload": "Upload",
+    "uploadingModel": "Uploading model...",
+    "uploadSuccess": "Model uploaded successfully!",
+    "uploadFailed": "Upload failed",
+    "modelAssociatedWithLink": "The model associated with the link you provided:",
+    "modelTypeSelectorLabel": "What type of model is this?",
+    "modelTypeSelectorPlaceholder": "Select model type",
+    "selectModelType": "Select model type",
+    "notSureLeaveAsIs": "Not sure? Just leave this as is",
+    "modelUploaded": "Model uploaded! 🎉",
+    "findInLibrary": "Find it in the {type} section of the models library.",
+    "finish": "Finish",
     "allModels": "All Models",
     "allCategory": "All {category}",
     "unknown": "Unknown",
@@ -2087,6 +2116,13 @@
     "sortZA": "Z-A",
     "sortRecent": "Recent",
     "sortPopular": "Popular",
+    "errorFileTooLarge": "File exceeds the maximum allowed size limit",
+    "errorFormatNotAllowed": "Only SafeTensor format is allowed",
+    "errorUnsafePickleScan": "CivitAI detected potentially unsafe code in this file",
+    "errorUnsafeVirusScan": "CivitAI detected malware or suspicious content in this file",
+    "errorModelTypeNotSupported": "This model type is not supported",
+    "errorUnknown": "An unexpected error occurred",
+    "errorUploadFailed": "Failed to upload asset. Please try again.",
     "ariaLabel": {
       "assetCard": "{name} - {type} asset",
       "loadingAsset": "Loading asset"

src/platform/assets/components/AssetBrowserModal.vue

@@ -73,11 +73,14 @@ import LeftSidePanel from '@/components/widget/panel/LeftSidePanel.vue'
 import { useFeatureFlags } from '@/composables/useFeatureFlags'
 import AssetFilterBar from '@/platform/assets/components/AssetFilterBar.vue'
 import AssetGrid from '@/platform/assets/components/AssetGrid.vue'
+import UploadModelDialog from '@/platform/assets/components/UploadModelDialog.vue'
+import UploadModelDialogHeader from '@/platform/assets/components/UploadModelDialogHeader.vue'
 import type { AssetDisplayItem } from '@/platform/assets/composables/useAssetBrowser'
 import { useAssetBrowser } from '@/platform/assets/composables/useAssetBrowser'
 import type { AssetItem } from '@/platform/assets/schemas/assetSchema'
 import { assetService } from '@/platform/assets/services/assetService'
 import { formatCategoryLabel } from '@/platform/assets/utils/categoryLabel'
+import { useDialogStore } from '@/stores/dialogStore'
 import { useModelToNodeStore } from '@/stores/modelToNodeStore'
 import { OnCloseKey } from '@/types/widgetTypes'
 
@@ -92,6 +95,7 @@ const props = defineProps<{
 }>()
 
 const { t } = useI18n()
+const dialogStore = useDialogStore()
 
 const emit = defineEmits<{
   'asset-select': [asset: AssetDisplayItem]
@@ -189,6 +193,15 @@ const { flags } = useFeatureFlags()
 const isUploadButtonEnabled = computed(() => flags.modelUploadButtonEnabled)
 
 function handleUploadClick() {
-  // Will be implemented in the future commit
+  dialogStore.showDialog({
+    key: 'upload-model',
+    headerComponent: UploadModelDialogHeader,
+    component: UploadModelDialog,
+    props: {
+      onUploadSuccess: async () => {
+        await execute()
+      }
+    }
+  })
 }
 </script>

src/platform/assets/components/UploadModelConfirmation.vue

@@ -0,0 +1,58 @@
+<template>
+  <div class="flex flex-col gap-4">
+    <!-- Model Info Section -->
+    <div class="flex flex-col gap-2">
+      <p class="text-sm text-muted m-0">
+        {{ $t('assetBrowser.modelAssociatedWithLink') }}
+      </p>
+      <p class="text-sm mt-0">
+        {{ metadata?.name || metadata?.filename }}
+      </p>
+    </div>
+
+    <!-- Model Type Selection -->
+    <div class="flex flex-col gap-2">
+      <label class="text-sm text-muted">
+        {{ $t('assetBrowser.modelTypeSelectorLabel') }}
+      </label>
+      <SingleSelect
+        v-model="selectedModelType"
+        :label="
+          isLoading
+            ? $t('g.loading')
+            : $t('assetBrowser.modelTypeSelectorPlaceholder')
+        "
+        :options="modelTypes"
+        :disabled="isLoading"
+      />
+      <div class="flex items-center gap-2 text-sm text-muted">
+        <i class="icon-[lucide--info]" />
+        <span>{{ $t('assetBrowser.notSureLeaveAsIs') }}</span>
+      </div>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { computed } from 'vue'
+
+import SingleSelect from '@/components/input/SingleSelect.vue'
+import { useModelTypes } from '@/platform/assets/composables/useModelTypes'
+import type { AssetMetadata } from '@/platform/assets/schemas/assetSchema'
+
+const props = defineProps<{
+  modelValue: string | undefined
+  metadata: AssetMetadata | null
+}>()
+
+const emit = defineEmits<{
+  'update:modelValue': [value: string | undefined]
+}>()
+
+const { modelTypes, isLoading } = useModelTypes()
+
+const selectedModelType = computed({
+  get: () => props.modelValue ?? null,
+  set: (value: string | null) => emit('update:modelValue', value ?? undefined)
+})
+</script>

src/platform/assets/components/UploadModelDialog.vue

@@ -0,0 +1,108 @@
+<template>
+  <div class="upload-model-dialog flex flex-col justify-between gap-6 p-4 pt-6">
+    <!-- Step 1: Enter URL -->
+    <UploadModelUrlInput
+      v-if="currentStep === 1"
+      v-model="wizardData.url"
+      :error="uploadError"
+    />
+
+    <!-- Step 2: Confirm Metadata -->
+    <UploadModelConfirmation
+      v-else-if="currentStep === 2"
+      v-model="selectedModelType"
+      :metadata="wizardData.metadata"
+    />
+
+    <!-- Step 3: Upload Progress -->
+    <UploadModelProgress
+      v-else-if="currentStep === 3"
+      :status="uploadStatus"
+      :error="uploadError"
+      :metadata="wizardData.metadata"
+      :model-type="selectedModelType"
+    />
+
+    <!-- Navigation Footer -->
+    <UploadModelFooter
+      :current-step="currentStep"
+      :is-fetching-metadata="isFetchingMetadata"
+      :is-uploading="isUploading"
+      :can-fetch-metadata="canFetchMetadata"
+      :can-upload-model="canUploadModel"
+      :upload-status="uploadStatus"
+      @back="goToPreviousStep"
+      @fetch-metadata="handleFetchMetadata"
+      @upload="handleUploadModel"
+      @close="handleClose"
+    />
+  </div>
+</template>
+
+<script setup lang="ts">
+import { onMounted } from 'vue'
+
+import UploadModelConfirmation from '@/platform/assets/components/UploadModelConfirmation.vue'
+import UploadModelFooter from '@/platform/assets/components/UploadModelFooter.vue'
+import UploadModelProgress from '@/platform/assets/components/UploadModelProgress.vue'
+import UploadModelUrlInput from '@/platform/assets/components/UploadModelUrlInput.vue'
+import { useModelTypes } from '@/platform/assets/composables/useModelTypes'
+import { useUploadModelWizard } from '@/platform/assets/composables/useUploadModelWizard'
+import { useDialogStore } from '@/stores/dialogStore'
+
+const dialogStore = useDialogStore()
+const { modelTypes, fetchModelTypes } = useModelTypes()
+
+const emit = defineEmits<{
+  'upload-success': []
+}>()
+
+const {
+  currentStep,
+  isFetchingMetadata,
+  isUploading,
+  uploadStatus,
+  uploadError,
+  wizardData,
+  selectedModelType,
+  canFetchMetadata,
+  canUploadModel,
+  fetchMetadata,
+  uploadModel,
+  goToPreviousStep
+} = useUploadModelWizard(modelTypes)
+
+async function handleFetchMetadata() {
+  await fetchMetadata()
+}
+
+async function handleUploadModel() {
+  const success = await uploadModel()
+  if (success) {
+    emit('upload-success')
+  }
+}
+
+function handleClose() {
+  dialogStore.closeDialog({ key: 'upload-model' })
+}
+
+onMounted(() => {
+  fetchModelTypes()
+})
+</script>
+
+<style scoped>
+.upload-model-dialog {
+  width: 90vw;
+  max-width: 800px;
+  min-height: 400px;
+}
+
+@media (min-width: 640px) {
+  .upload-model-dialog {
+    width: auto;
+    min-width: 600px;
+  }
+}
+</style>

src/platform/assets/components/UploadModelDialogHeader.vue

@@ -0,0 +1,12 @@
+<template>
+  <div class="flex items-center gap-3 px-4 py-2 font-bold">
+    <span>{{ $t('assetBrowser.uploadModelFromCivitai') }}</span>
+    <span
+      class="rounded-full bg-white px-1.5 py-0 text-xxs font-medium uppercase text-black"
+    >
+      {{ $t('g.beta') }}
+    </span>
+  </div>
+</template>
+
+<script setup lang="ts"></script>

src/platform/assets/components/UploadModelFooter.vue

@@ -0,0 +1,72 @@
+<template>
+  <div class="flex justify-end gap-2">
+    <TextButton
+      v-if="currentStep !== 1 && currentStep !== 3"
+      :label="$t('g.back')"
+      type="secondary"
+      size="md"
+      :disabled="isFetchingMetadata || isUploading"
+      @click="emit('back')"
+    />
+    <span v-else />
+
+    <IconTextButton
+      v-if="currentStep === 1"
+      :label="$t('g.continue')"
+      type="primary"
+      size="md"
+      :disabled="!canFetchMetadata || isFetchingMetadata"
+      @click="emit('fetchMetadata')"
+    >
+      <template #icon>
+        <i
+          v-if="isFetchingMetadata"
+          class="icon-[lucide--loader-circle] animate-spin"
+        />
+      </template>
+    </IconTextButton>
+    <IconTextButton
+      v-else-if="currentStep === 2"
+      :label="$t('assetBrowser.upload')"
+      type="primary"
+      size="md"
+      :disabled="!canUploadModel || isUploading"
+      @click="emit('upload')"
+    >
+      <template #icon>
+        <i
+          v-if="isUploading"
+          class="icon-[lucide--loader-circle] animate-spin"
+        />
+      </template>
+    </IconTextButton>
+    <TextButton
+      v-else-if="currentStep === 3 && uploadStatus === 'success'"
+      :label="$t('assetBrowser.finish')"
+      type="primary"
+      size="md"
+      @click="emit('close')"
+    />
+  </div>
+</template>
+
+<script setup lang="ts">
+import IconTextButton from '@/components/button/IconTextButton.vue'
+import TextButton from '@/components/button/TextButton.vue'
+
+defineProps<{
+  currentStep: number
+  isFetchingMetadata: boolean
+  isUploading: boolean
+  canFetchMetadata: boolean
+  canUploadModel: boolean
+  uploadStatus: 'idle' | 'uploading' | 'success' | 'error'
+}>()
+
+const emit = defineEmits<{
+  (e: 'back'): void
+  (e: 'fetchMetadata'): void
+  (e: 'upload'): void
+  (e: 'close'): void
+}>()
+</script>

src/platform/assets/components/UploadModelProgress.vue

@@ -0,0 +1,68 @@
+<template>
+  <div class="flex flex-1 flex-col gap-6">
+    <!-- Uploading State -->
+    <div
+      v-if="status === 'uploading'"
+      class="flex flex-1 flex-col items-center justify-center gap-6"
+    >
+      <i
+        class="icon-[lucide--loader-circle] animate-spin text-6xl text-primary"
+      />
+      <div class="text-center">
+        <p class="m-0 text-sm font-bold">
+          {{ $t('assetBrowser.uploadingModel') }}
+        </p>
+      </div>
+    </div>
+
+    <!-- Success State -->
+    <div v-else-if="status === 'success'" class="flex flex-col gap-8">
+      <div class="flex flex-col gap-4">
+        <p class="text-sm text-muted m-0 font-bold">
+          {{ $t('assetBrowser.modelUploaded') }}
+        </p>
+        <p class="text-sm text-muted m-0">
+          {{ $t('assetBrowser.findInLibrary', { type: modelType }) }}
+        </p>
+      </div>
+
+      <div class="flex flex-row items-start p-8 bg-neutral-800 rounded-lg">
+        <div class="flex flex-col justify-center items-start gap-1 flex-1">
+          <p class="text-sm m-0">
+            {{ metadata?.name || metadata?.filename }}
+          </p>
+          <p class="text-sm text-muted m-0">
+            {{ modelType }}
+          </p>
+        </div>
+      </div>
+    </div>
+
+    <!-- Error State -->
+    <div
+      v-else-if="status === 'error'"
+      class="flex flex-1 flex-col items-center justify-center gap-6"
+    >
+      <i class="icon-[lucide--x-circle] text-6xl text-error" />
+      <div class="text-center">
+        <p class="m-0 text-sm font-bold">
+          {{ $t('assetBrowser.uploadFailed') }}
+        </p>
+        <p v-if="error" class="text-sm text-muted mb-0">
+          {{ error }}
+        </p>
+      </div>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+import type { AssetMetadata } from '@/platform/assets/schemas/assetSchema'
+
+defineProps<{
+  status: 'idle' | 'uploading' | 'success' | 'error'
+  error?: string
+  metadata: AssetMetadata | null
+  modelType: string | undefined
+}>()
+</script>

src/platform/assets/components/UploadModelUrlInput.vue

@@ -0,0 +1,50 @@
+<template>
+  <div class="flex flex-col gap-4">
+    <div class="flex flex-col gap-2">
+      <p class="text-sm text-muted m-0">
+        {{ $t('assetBrowser.uploadModelDescription1') }}
+      </p>
+      <ul class="list-disc space-y-1 pl-5 mt-0 text-sm text-muted">
+        <li>{{ $t('assetBrowser.uploadModelDescription2') }}</li>
+        <li>{{ $t('assetBrowser.uploadModelDescription3') }}</li>
+      </ul>
+    </div>
+
+    <div class="flex flex-col gap-2">
+      <label class="text-sm text-muted mb-0">
+        {{ $t('assetBrowser.civitaiLinkLabel') }}
+      </label>
+      <UrlInput
+        v-model="url"
+        :placeholder="$t('assetBrowser.civitaiLinkPlaceholder')"
+        :disable-validation="true"
+      />
+      <p v-if="error" class="text-xs text-error">
+        {{ error }}
+      </p>
+      <p v-else class="text-xs text-muted">
+        {{ $t('assetBrowser.civitaiLinkExample') }}
+      </p>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { computed } from 'vue'
+
+import UrlInput from '@/components/common/UrlInput.vue'
+
+const props = defineProps<{
+  modelValue: string
+  error?: string
+}>()
+
+const emit = defineEmits<{
+  'update:modelValue': [value: string]
+}>()
+
+const url = computed({
+  get: () => props.modelValue,
+  set: (value: string) => emit('update:modelValue', value)
+})
+</script>

src/platform/assets/composables/useModelTypes.ts

@@ -0,0 +1,73 @@
+import { createSharedComposable, useAsyncState } from '@vueuse/core'
+
+import { api } from '@/scripts/api'
+
+/**
+ * Format folder name to display name
+ * Converts "upscale_models" -> "Upscale Models"
+ * Converts "loras" -> "LoRAs"
+ */
+function formatDisplayName(folderName: string): string {
+  // Special cases for acronyms and proper nouns
+  const specialCases: Record<string, string> = {
+    loras: 'LoRAs',
+    ipadapter: 'IP-Adapter',
+    sams: 'SAMs',
+    clip_vision: 'CLIP Vision',
+    animatediff_motion_lora: 'AnimateDiff Motion LoRA',
+    animatediff_models: 'AnimateDiff Models',
+    vae: 'VAE',
+    sam2: 'SAM 2',
+    controlnet: 'ControlNet',
+    gligen: 'GLIGEN'
+  }
+
+  if (specialCases[folderName]) {
+    return specialCases[folderName]
+  }
+
+  return folderName
+    .split('_')
+    .map((word) => word.charAt(0).toUpperCase() + word.slice(1))
+    .join(' ')
+}
+
+interface ModelTypeOption {
+  name: string // Display name
+  value: string // Actual tag value
+}
+
+/**
+ * Composable for fetching and managing model types from the API
+ * Uses shared state to ensure data is only fetched once
+ */
+export const useModelTypes = createSharedComposable(() => {
+  const {
+    state: modelTypes,
+    isLoading,
+    error,
+    execute: fetchModelTypes
+  } = useAsyncState(
+    async (): Promise<ModelTypeOption[]> => {
+      const response = await api.getModelFolders()
+      return response.map((folder) => ({
+        name: formatDisplayName(folder.name),
+        value: folder.name
+      }))
+    },
+    [] as ModelTypeOption[],
+    {
+      immediate: false,
+      onError: (err) => {
+        console.error('Failed to fetch model types:', err)
+      }
+    }
+  )
+
+  return {
+    modelTypes,
+    isLoading,
+    error,
+    fetchModelTypes
+  }
+})

src/platform/assets/composables/useUploadModelWizard.ts

@@ -0,0 +1,175 @@
+import type { Ref } from 'vue'
+import { computed, ref, watch } from 'vue'
+
+import { st } from '@/i18n'
+import type { AssetMetadata } from '@/platform/assets/schemas/assetSchema'
+import { assetService } from '@/platform/assets/services/assetService'
+
+interface WizardData {
+  url: string
+  metadata: AssetMetadata | null
+  name: string
+  tags: string[]
+}
+
+interface ModelTypeOption {
+  name: string
+  value: string
+}
+
+export function useUploadModelWizard(modelTypes: Ref<ModelTypeOption[]>) {
+  const currentStep = ref(1)
+  const isFetchingMetadata = ref(false)
+  const isUploading = ref(false)
+  const uploadStatus = ref<'idle' | 'uploading' | 'success' | 'error'>('idle')
+  const uploadError = ref('')
+
+  const wizardData = ref<WizardData>({
+    url: '',
+    metadata: null,
+    name: '',
+    tags: []
+  })
+
+  const selectedModelType = ref<string | undefined>(undefined)
+
+  // Clear error when URL changes
+  watch(
+    () => wizardData.value.url,
+    () => {
+      uploadError.value = ''
+    }
+  )
+
+  // Validation
+  const canFetchMetadata = computed(() => {
+    return wizardData.value.url.trim().length > 0
+  })
+
+  const canUploadModel = computed(() => {
+    return !!selectedModelType.value
+  })
+
+  function isCivitaiUrl(url: string): boolean {
+    try {
+      const hostname = new URL(url).hostname.toLowerCase()
+      return hostname === 'civitai.com' || hostname.endsWith('.civitai.com')
+    } catch {
+      return false
+    }
+  }
+
+  async function fetchMetadata() {
+    if (!canFetchMetadata.value) return
+
+    if (!isCivitaiUrl(wizardData.value.url)) {
+      uploadError.value = st(
+        'assetBrowser.onlyCivitaiUrlsSupported',
+        'Only Civitai URLs are supported'
+      )
+      return
+    }
+
+    isFetchingMetadata.value = true
+    try {
+      const metadata = await assetService.getAssetMetadata(wizardData.value.url)
+      wizardData.value.metadata = metadata
+
+      // Pre-fill name from metadata
+      wizardData.value.name = metadata.filename || metadata.name || ''
+
+      // Pre-fill model type from metadata tags if available
+      if (metadata.tags && metadata.tags.length > 0) {
+        wizardData.value.tags = metadata.tags
+        // Try to detect model type from tags
+        const typeTag = metadata.tags.find((tag) =>
+          modelTypes.value.some((type) => type.value === tag)
+        )
+        if (typeTag) {
+          selectedModelType.value = typeTag
+        }
+      }
+
+      currentStep.value = 2
+    } catch (error) {
+      console.error('Failed to retrieve metadata:', error)
+      uploadError.value =
+        error instanceof Error
+          ? error.message
+          : st(
+              'assetBrowser.uploadModelFailedToRetrieveMetadata',
+              'Failed to retrieve metadata. Please check the link and try again.'
+            )
+      currentStep.value = 1
+    } finally {
+      isFetchingMetadata.value = false
+    }
+  }
+
+  async function uploadModel() {
+    if (!canUploadModel.value) return
+
+    isUploading.value = true
+    uploadStatus.value = 'uploading'
+
+    try {
+      const tags = selectedModelType.value
+        ? ['models', selectedModelType.value]
+        : ['models']
+      const filename =
+        wizardData.value.metadata?.filename ||
+        wizardData.value.metadata?.name ||
+        'model'
+
+      await assetService.uploadAssetFromUrl({
+        url: wizardData.value.url,
+        name: filename,
+        tags,
+        user_metadata: {
+          source: 'civitai',
+          source_url: wizardData.value.url,
+          model_type: selectedModelType.value
+        }
+      })
+
+      uploadStatus.value = 'success'
+      currentStep.value = 3
+      return true
+    } catch (error) {
+      console.error('Failed to upload asset:', error)
+      uploadStatus.value = 'error'
+      uploadError.value =
+        error instanceof Error ? error.message : 'Failed to upload model'
+      currentStep.value = 3
+      return false
+    } finally {
+      isUploading.value = false
+    }
+  }
+
+  function goToPreviousStep() {
+    if (currentStep.value > 1) {
+      currentStep.value = currentStep.value - 1
+    }
+  }
+
+  return {
+    // State
+    currentStep,
+    isFetchingMetadata,
+    isUploading,
+    uploadStatus,
+    uploadError,
+    wizardData,
+    selectedModelType,
+
+    // Computed
+    canFetchMetadata,
+    canUploadModel,
+
+    // Actions
+    fetchMetadata,
+    uploadModel,
+    goToPreviousStep
+  }
+}

src/platform/assets/schemas/assetSchema.ts

@@ -33,6 +33,29 @@ const zModelFile = z.object({
   pathIndex: z.number()
 })
 
+const zValidationError = z.object({
+  code: z.string(),
+  message: z.string(),
+  field: z.string()
+})
+
+const zValidationResult = z.object({
+  is_valid: z.boolean(),
+  errors: z.array(zValidationError).optional(),
+  warnings: z.array(zValidationError).optional()
+})
+
+const zAssetMetadata = z.object({
+  content_length: z.number(),
+  final_url: z.string(),
+  content_type: z.string().optional(),
+  filename: z.string().optional(),
+  name: z.string().optional(),
+  tags: z.array(z.string()).optional(),
+  preview_url: z.string().optional(),
+  validation: zValidationResult.optional()
+})
+
 // Filename validation schema
 export const assetFilenameSchema = z
   .string()
@@ -48,6 +71,7 @@ export const assetResponseSchema = zAssetResponse
 // Export types derived from Zod schemas
 export type AssetItem = z.infer<typeof zAsset>
 export type AssetResponse = z.infer<typeof zAssetResponse>
+export type AssetMetadata = z.infer<typeof zAssetMetadata>
 export type ModelFolder = z.infer<typeof zModelFolder>
 export type ModelFile = z.infer<typeof zModelFile>
 

src/platform/assets/services/assetService.ts

@@ -1,8 +1,10 @@
 import { fromZodError } from 'zod-validation-error'
 
+import { st } from '@/i18n'
 import { assetResponseSchema } from '@/platform/assets/schemas/assetSchema'
 import type {
   AssetItem,
+  AssetMetadata,
   AssetResponse,
   ModelFile,
   ModelFolder
@@ -10,6 +12,36 @@ import type {
 import { api } from '@/scripts/api'
 import { useModelToNodeStore } from '@/stores/modelToNodeStore'
 
+/**
+ * Maps CivitAI validation error codes to localized error messages
+ */
+function getLocalizedErrorMessage(errorCode: string): string {
+  const errorMessages: Record<string, string> = {
+    FILE_TOO_LARGE: st('assetBrowser.errorFileTooLarge', 'File too large'),
+    FORMAT_NOT_ALLOWED: st(
+      'assetBrowser.errorFormatNotAllowed',
+      'Format not allowed'
+    ),
+    UNSAFE_PICKLE_SCAN: st(
+      'assetBrowser.errorUnsafePickleScan',
+      'Unsafe pickle scan'
+    ),
+    UNSAFE_VIRUS_SCAN: st(
+      'assetBrowser.errorUnsafeVirusScan',
+      'Unsafe virus scan'
+    ),
+    MODEL_TYPE_NOT_SUPPORTED: st(
+      'assetBrowser.errorModelTypeNotSupported',
+      'Model type not supported'
+    )
+  }
+  return (
+    errorMessages[errorCode] ||
+    st('assetBrowser.errorUnknown', 'Unknown error') ||
+    'Unknown error'
+  )
+}
+
 const ASSETS_ENDPOINT = '/assets'
 const EXPERIMENTAL_WARNING = `EXPERIMENTAL: If you are seeing this please make sure "Comfy.Assets.UseAssetAPI" is set to "false" in your ComfyUI Settings.\n`
 const DEFAULT_LIMIT = 500
@@ -249,6 +281,77 @@ function createAssetService() {
     }
   }
 
+  /**
+   * Retrieves metadata from a download URL without downloading the file
+   *
+   * @param url - Download URL to retrieve metadata from (will be URL-encoded)
+   * @returns Promise with metadata including content_length, final_url, filename, etc.
+   * @throws Error if metadata retrieval fails
+   */
+  async function getAssetMetadata(url: string): Promise<AssetMetadata> {
+    const encodedUrl = encodeURIComponent(url)
+    const res = await api.fetchApi(
+      `${ASSETS_ENDPOINT}/remote-metadata?url=${encodedUrl}`
+    )
+
+    if (!res.ok) {
+      const errorData = await res.json().catch(() => ({}))
+      throw new Error(
+        getLocalizedErrorMessage(errorData.code || 'UNKNOWN_ERROR')
+      )
+    }
+
+    const data: AssetMetadata = await res.json()
+    if (data.validation?.is_valid === false) {
+      throw new Error(
+        getLocalizedErrorMessage(
+          data.validation?.errors?.[0]?.code || 'UNKNOWN_ERROR'
+        )
+      )
+    }
+
+    return data
+  }
+
+  /**
+   * Uploads an asset by providing a URL to download from
+   *
+   * @param params - Upload parameters
+   * @param params.url - HTTP/HTTPS URL to download from
+   * @param params.name - Display name (determines extension)
+   * @param params.tags - Optional freeform tags
+   * @param params.user_metadata - Optional custom metadata object
+   * @param params.preview_id - Optional UUID for preview asset
+   * @returns Promise<AssetItem & { created_new: boolean }> - Asset object with created_new flag
+   * @throws Error if upload fails
+   */
+  async function uploadAssetFromUrl(params: {
+    url: string
+    name: string
+    tags?: string[]
+    user_metadata?: Record<string, any>
+    preview_id?: string
+  }): Promise<AssetItem & { created_new: boolean }> {
+    const res = await api.fetchApi(ASSETS_ENDPOINT, {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json'
+      },
+      body: JSON.stringify(params)
+    })
+
+    if (!res.ok) {
+      throw new Error(
+        st(
+          'assetBrowser.errorUploadFailed',
+          'Failed to upload asset. Please try again.'
+        )
+      )
+    }
+
+    return await res.json()
+  }
+
   return {
     getAssetModelFolders,
     getAssetModels,
@@ -256,7 +359,9 @@ function createAssetService() {
     getAssetsForNodeType,
     getAssetDetails,
     getAssetsByTag,
-    deleteAsset
+    deleteAsset,
+    getAssetMetadata,
+    uploadAssetFromUrl
   }
 }