chore: import upstream snapshot with attribution

apps/sim/app/api/tools/sharepoint/download-file/route.ts

@@ -0,0 +1,178 @@
+import { createLogger } from '@sim/logger'
+import { getErrorMessage } from '@sim/utils/errors'
+import { type NextRequest, NextResponse } from 'next/server'
+import { sharepointDownloadFileContract } from '@/lib/api/contracts/tools/microsoft'
+import { parseRequest } from '@/lib/api/server'
+import { checkInternalAuth } from '@/lib/auth/hybrid'
+import {
+  secureFetchWithPinnedIP,
+  validateUrlWithDNS,
+} from '@/lib/core/security/input-validation.server'
+import { generateRequestId } from '@/lib/core/utils/request'
+import { withRouteHandler } from '@/lib/core/utils/with-route-handler'
+import { MAX_FILE_SIZE } from '@/lib/uploads/utils/validation'
+
+export const dynamic = 'force-dynamic'
+
+/** Microsoft Graph API error response structure */
+interface GraphApiError {
+  error?: {
+    code?: string
+    message?: string
+  }
+}
+
+/** Microsoft Graph API drive item metadata response */
+interface DriveItemMetadata {
+  id?: string
+  name?: string
+  folder?: Record<string, unknown>
+  file?: {
+    mimeType?: string
+  }
+}
+
+const logger = createLogger('SharepointDownloadFileAPI')
+
+export const POST = withRouteHandler(async (request: NextRequest) => {
+  const requestId = generateRequestId()
+
+  try {
+    const authResult = await checkInternalAuth(request, { requireWorkflowId: false })
+
+    if (!authResult.success) {
+      logger.warn(`[${requestId}] Unauthorized SharePoint download attempt: ${authResult.error}`)
+      return NextResponse.json(
+        {
+          success: false,
+          error: authResult.error || 'Authentication required',
+        },
+        { status: 401 }
+      )
+    }
+
+    const parsed = await parseRequest(sharepointDownloadFileContract, request, {})
+    if (!parsed.success) return parsed.response
+    const { accessToken, driveId, itemId, fileName } = parsed.data.body
+    const authHeader = `Bearer ${accessToken}`
+
+    logger.info(`[${requestId}] Getting file metadata from SharePoint`, { driveId, itemId })
+
+    const metadataUrl = `https://graph.microsoft.com/v1.0/drives/${encodeURIComponent(driveId)}/items/${encodeURIComponent(itemId)}`
+    const metadataUrlValidation = await validateUrlWithDNS(metadataUrl, 'metadataUrl')
+    if (!metadataUrlValidation.isValid) {
+      return NextResponse.json(
+        { success: false, error: metadataUrlValidation.error },
+        { status: 400 }
+      )
+    }
+
+    const metadataResponse = await secureFetchWithPinnedIP(
+      metadataUrl,
+      metadataUrlValidation.resolvedIP!,
+      {
+        headers: { Authorization: authHeader },
+      }
+    )
+
+    if (!metadataResponse.ok) {
+      const errorDetails = (await metadataResponse.json().catch(() => ({}))) as GraphApiError
+      logger.error(`[${requestId}] Failed to get file metadata`, {
+        status: metadataResponse.status,
+        error: errorDetails,
+      })
+      return NextResponse.json(
+        { success: false, error: errorDetails.error?.message || 'Failed to get file metadata' },
+        { status: 400 }
+      )
+    }
+
+    const metadata = (await metadataResponse.json()) as DriveItemMetadata
+
+    if (metadata.folder && !metadata.file) {
+      logger.error(`[${requestId}] Attempted to download a folder`, {
+        itemId: metadata.id,
+        itemName: metadata.name,
+      })
+      return NextResponse.json(
+        {
+          success: false,
+          error: `Cannot download folder "${metadata.name}". Please select a file instead.`,
+        },
+        { status: 400 }
+      )
+    }
+
+    const mimeType = metadata.file?.mimeType || 'application/octet-stream'
+
+    logger.info(`[${requestId}] Downloading file from SharePoint`, { driveId, itemId, mimeType })
+
+    const downloadUrl = `https://graph.microsoft.com/v1.0/drives/${encodeURIComponent(driveId)}/items/${encodeURIComponent(itemId)}/content`
+    const downloadUrlValidation = await validateUrlWithDNS(downloadUrl, 'downloadUrl')
+    if (!downloadUrlValidation.isValid) {
+      return NextResponse.json(
+        { success: false, error: downloadUrlValidation.error },
+        { status: 400 }
+      )
+    }
+
+    const downloadResponse = await secureFetchWithPinnedIP(
+      downloadUrl,
+      downloadUrlValidation.resolvedIP!,
+      {
+        headers: { Authorization: authHeader },
+        // The content endpoint 302s to a preauthenticated URL on a different origin that needs no auth.
+        stripAuthOnRedirect: true,
+        maxResponseBytes: MAX_FILE_SIZE,
+      }
+    )
+
+    if (!downloadResponse.ok) {
+      const downloadError = (await downloadResponse.json().catch(() => ({}))) as GraphApiError
+      logger.error(`[${requestId}] Failed to download file`, {
+        status: downloadResponse.status,
+        error: downloadError,
+      })
+      return NextResponse.json(
+        { success: false, error: downloadError.error?.message || 'Failed to download file' },
+        { status: 400 }
+      )
+    }
+
+    const arrayBuffer = await downloadResponse.arrayBuffer()
+    const fileBuffer = Buffer.from(arrayBuffer)
+
+    const resolvedName = fileName || metadata.name || 'download'
+
+    logger.info(`[${requestId}] File downloaded successfully`, {
+      driveId,
+      itemId,
+      name: resolvedName,
+      size: fileBuffer.length,
+      mimeType,
+    })
+
+    const base64Data = fileBuffer.toString('base64')
+
+    return NextResponse.json({
+      success: true,
+      output: {
+        file: {
+          name: resolvedName,
+          mimeType,
+          data: base64Data,
+          size: fileBuffer.length,
+        },
+      },
+    })
+  } catch (error) {
+    logger.error(`[${requestId}] Error downloading SharePoint file:`, error)
+    return NextResponse.json(
+      {
+        success: false,
+        error: getErrorMessage(error, 'Unknown error occurred'),
+      },
+      { status: 500 }
+    )
+  }
+})

apps/sim/app/api/tools/sharepoint/lists/route.ts

@@ -0,0 +1,119 @@
+import { createLogger } from '@sim/logger'
+import { type NextRequest, NextResponse } from 'next/server'
+import { sharepointListsSelectorContract } from '@/lib/api/contracts/selectors'
+import { parseRequest } from '@/lib/api/server'
+import { authorizeCredentialUse } from '@/lib/auth/credential-access'
+import { validateSharePointSiteId } from '@/lib/core/security/input-validation'
+import { generateRequestId } from '@/lib/core/utils/request'
+import { withRouteHandler } from '@/lib/core/utils/with-route-handler'
+import { refreshAccessTokenIfNeeded } from '@/app/api/auth/oauth/utils'
+import { assertGraphNextPageUrl, getGraphNextPageUrl } from '@/tools/sharepoint/utils'
+
+export const dynamic = 'force-dynamic'
+
+const logger = createLogger('SharePointListsAPI')
+
+/**
+ * Upper bound on Microsoft Graph pages drained when listing SharePoint lists.
+ * Each page returns up to `$top=999` lists, so this caps the result set at
+ * roughly 10k lists while preventing an unbounded server-side loop.
+ */
+const MAX_LISTS_PAGES = 10
+
+interface SharePointList {
+  id: string
+  displayName: string
+  description?: string
+  webUrl?: string
+  list?: {
+    hidden?: boolean
+  }
+}
+
+export const POST = withRouteHandler(async (request: NextRequest) => {
+  const requestId = generateRequestId()
+
+  try {
+    const parsed = await parseRequest(sharepointListsSelectorContract, request, {})
+    if (!parsed.success) {
+      logger.warn(`[${requestId}] Invalid lists request data`)
+      return parsed.response
+    }
+    const { credential, workflowId, siteId } = parsed.data.body
+
+    const siteIdValidation = validateSharePointSiteId(siteId)
+    if (!siteIdValidation.isValid) {
+      logger.error(`[${requestId}] Invalid siteId: ${siteIdValidation.error}`)
+      return NextResponse.json({ error: siteIdValidation.error }, { status: 400 })
+    }
+
+    const authz = await authorizeCredentialUse(request, {
+      credentialId: credential,
+      workflowId,
+    })
+    if (!authz.ok || !authz.credentialOwnerUserId) {
+      return NextResponse.json({ error: authz.error || 'Unauthorized' }, { status: 403 })
+    }
+
+    const accessToken = await refreshAccessTokenIfNeeded(
+      credential,
+      authz.credentialOwnerUserId,
+      requestId
+    )
+    if (!accessToken) {
+      logger.error(`[${requestId}] Failed to obtain valid access token`)
+      return NextResponse.json(
+        { error: 'Failed to obtain valid access token', authRequired: true },
+        { status: 401 }
+      )
+    }
+
+    let nextUrl: string | undefined =
+      `https://graph.microsoft.com/v1.0/sites/${siteIdValidation.sanitized}/lists?$select=id,displayName,description,webUrl&$expand=list($select=hidden)&$top=999`
+
+    const rawLists: SharePointList[] = []
+    for (let page = 0; page < MAX_LISTS_PAGES && nextUrl; page++) {
+      const response = await fetch(nextUrl, {
+        headers: {
+          Authorization: `Bearer ${accessToken}`,
+        },
+      })
+
+      if (!response.ok) {
+        const errorData = await response
+          .json()
+          .catch(() => ({ error: { message: 'Unknown error' } }))
+        return NextResponse.json(
+          { error: errorData.error?.message || 'Failed to fetch lists from SharePoint' },
+          { status: response.status }
+        )
+      }
+
+      const data = await response.json()
+      if (Array.isArray(data.value)) {
+        rawLists.push(...data.value)
+      }
+
+      const nextLink = getGraphNextPageUrl(data)
+      nextUrl = nextLink ? assertGraphNextPageUrl(nextLink) : undefined
+      if (nextUrl && page === MAX_LISTS_PAGES - 1) {
+        logger.warn(
+          `[${requestId}] SharePoint lists pagination hit ${MAX_LISTS_PAGES}-page cap; result may be incomplete`
+        )
+      }
+    }
+
+    const lists = rawLists
+      .filter((list: SharePointList) => list.list?.hidden !== true)
+      .map((list: SharePointList) => ({
+        id: list.id,
+        displayName: list.displayName,
+      }))
+
+    logger.info(`[${requestId}] Successfully fetched ${lists.length} SharePoint lists`)
+    return NextResponse.json({ lists }, { status: 200 })
+  } catch (error) {
+    logger.error(`[${requestId}] Error fetching lists from SharePoint`, error)
+    return NextResponse.json({ error: 'Internal server error' }, { status: 500 })
+  }
+})

apps/sim/app/api/tools/sharepoint/site/route.ts

@@ -0,0 +1,96 @@
+import { createLogger } from '@sim/logger'
+import { generateId } from '@sim/utils/id'
+import { type NextRequest, NextResponse } from 'next/server'
+import { sharepointSiteQuerySchema } from '@/lib/api/contracts/selectors/sharepoint'
+import { getValidationErrorMessage } from '@/lib/api/server'
+import { authorizeCredentialUse } from '@/lib/auth/credential-access'
+import { validateMicrosoftGraphId } from '@/lib/core/security/input-validation'
+import { withRouteHandler } from '@/lib/core/utils/with-route-handler'
+import { refreshAccessTokenIfNeeded } from '@/app/api/auth/oauth/utils'
+
+export const dynamic = 'force-dynamic'
+
+const logger = createLogger('SharePointSiteAPI')
+
+export const GET = withRouteHandler(async (request: NextRequest) => {
+  const requestId = generateId().slice(0, 8)
+
+  try {
+    const { searchParams } = new URL(request.url)
+    const validation = sharepointSiteQuerySchema.safeParse({
+      credentialId: searchParams.get('credentialId') ?? '',
+      siteId: searchParams.get('siteId') ?? '',
+    })
+    if (!validation.success) {
+      return NextResponse.json(
+        { error: getValidationErrorMessage(validation.error, 'Invalid request') },
+        { status: 400 }
+      )
+    }
+    const { credentialId, siteId } = validation.data
+
+    const siteIdValidation = validateMicrosoftGraphId(siteId, 'siteId')
+    if (!siteIdValidation.isValid) {
+      return NextResponse.json({ error: siteIdValidation.error }, { status: 400 })
+    }
+
+    const authz = await authorizeCredentialUse(request, { credentialId })
+    if (!authz.ok || !authz.credentialOwnerUserId || !authz.resolvedCredentialId) {
+      return NextResponse.json({ error: authz.error || 'Unauthorized' }, { status: 403 })
+    }
+
+    const accessToken = await refreshAccessTokenIfNeeded(
+      authz.resolvedCredentialId,
+      authz.credentialOwnerUserId,
+      requestId
+    )
+    if (!accessToken) {
+      return NextResponse.json({ error: 'Failed to obtain valid access token' }, { status: 401 })
+    }
+
+    let endpoint: string
+    if (siteId === 'root') {
+      endpoint = 'sites/root'
+    } else if (siteId.includes(':')) {
+      endpoint = `sites/${siteId}`
+    } else if (siteId.includes('groups/')) {
+      endpoint = siteId
+    } else {
+      endpoint = `sites/${siteId}`
+    }
+
+    const response = await fetch(
+      `https://graph.microsoft.com/v1.0/${endpoint}?$select=id,name,displayName,webUrl,createdDateTime,lastModifiedDateTime`,
+      {
+        headers: {
+          Authorization: `Bearer ${accessToken}`,
+        },
+      }
+    )
+
+    if (!response.ok) {
+      const errorData = await response.json().catch(() => ({ error: { message: 'Unknown error' } }))
+      return NextResponse.json(
+        { error: errorData.error?.message || 'Failed to fetch site from SharePoint' },
+        { status: response.status }
+      )
+    }
+
+    const site = await response.json()
+
+    const transformedSite = {
+      id: site.id,
+      name: site.displayName || site.name,
+      mimeType: 'application/vnd.microsoft.graph.site',
+      webViewLink: site.webUrl,
+      createdTime: site.createdDateTime,
+      modifiedTime: site.lastModifiedDateTime,
+    }
+
+    logger.info(`[${requestId}] Successfully fetched SharePoint site: ${transformedSite.name}`)
+    return NextResponse.json({ site: transformedSite }, { status: 200 })
+  } catch (error) {
+    logger.error(`[${requestId}] Error fetching site from SharePoint`, error)
+    return NextResponse.json({ error: 'Internal server error' }, { status: 500 })
+  }
+})

apps/sim/app/api/tools/sharepoint/sites/route.ts

@@ -0,0 +1,106 @@
+import { createLogger } from '@sim/logger'
+import { type NextRequest, NextResponse } from 'next/server'
+import { sharepointSitesSelectorContract } from '@/lib/api/contracts/selectors'
+import { parseRequest } from '@/lib/api/server'
+import { authorizeCredentialUse } from '@/lib/auth/credential-access'
+import { generateRequestId } from '@/lib/core/utils/request'
+import { withRouteHandler } from '@/lib/core/utils/with-route-handler'
+import { refreshAccessTokenIfNeeded } from '@/app/api/auth/oauth/utils'
+import type { SharepointSite } from '@/tools/sharepoint/types'
+import { assertGraphNextPageUrl, getGraphNextPageUrl } from '@/tools/sharepoint/utils'
+
+export const dynamic = 'force-dynamic'
+
+const logger = createLogger('SharePointSitesAPI')
+
+/**
+ * Upper bound on Microsoft Graph pages drained when listing SharePoint sites.
+ * Each page returns up to `$top=999` sites, so this caps the result set at
+ * roughly 10k sites while preventing an unbounded server-side loop.
+ */
+const MAX_SITES_PAGES = 10
+
+export const POST = withRouteHandler(async (request: NextRequest) => {
+  const requestId = generateRequestId()
+
+  try {
+    const parsed = await parseRequest(sharepointSitesSelectorContract, request, {})
+    if (!parsed.success) {
+      logger.warn(`[${requestId}] Invalid sites request data`)
+      return parsed.response
+    }
+    const { credential, workflowId, query } = parsed.data.body
+
+    const authz = await authorizeCredentialUse(request, {
+      credentialId: credential,
+      workflowId,
+    })
+    if (!authz.ok || !authz.credentialOwnerUserId) {
+      return NextResponse.json({ error: authz.error || 'Unauthorized' }, { status: 403 })
+    }
+
+    const accessToken = await refreshAccessTokenIfNeeded(
+      credential,
+      authz.credentialOwnerUserId,
+      requestId
+    )
+    if (!accessToken) {
+      logger.error(`[${requestId}] Failed to obtain valid access token`)
+      return NextResponse.json(
+        { error: 'Failed to obtain valid access token', authRequired: true },
+        { status: 401 }
+      )
+    }
+
+    const searchQuery = query || '*'
+    let nextUrl: string | undefined =
+      `https://graph.microsoft.com/v1.0/sites?search=${encodeURIComponent(searchQuery)}&$select=id,name,displayName,webUrl,createdDateTime,lastModifiedDateTime&$top=999`
+
+    const rawSites: SharepointSite[] = []
+    for (let page = 0; page < MAX_SITES_PAGES && nextUrl; page++) {
+      const response = await fetch(nextUrl, {
+        headers: {
+          Authorization: `Bearer ${accessToken}`,
+        },
+      })
+
+      if (!response.ok) {
+        const errorData = await response
+          .json()
+          .catch(() => ({ error: { message: 'Unknown error' } }))
+        return NextResponse.json(
+          { error: errorData.error?.message || 'Failed to fetch sites from SharePoint' },
+          { status: response.status }
+        )
+      }
+
+      const data = await response.json()
+      if (Array.isArray(data.value)) {
+        rawSites.push(...data.value)
+      }
+
+      const nextLink = getGraphNextPageUrl(data)
+      nextUrl = nextLink ? assertGraphNextPageUrl(nextLink) : undefined
+      if (nextUrl && page === MAX_SITES_PAGES - 1) {
+        logger.warn(
+          `[${requestId}] SharePoint sites pagination hit ${MAX_SITES_PAGES}-page cap; result may be incomplete`
+        )
+      }
+    }
+
+    const sites = rawSites.map((site: SharepointSite) => ({
+      id: site.id,
+      name: site.displayName || site.name,
+      mimeType: 'application/vnd.microsoft.graph.site',
+      webViewLink: site.webUrl,
+      createdTime: site.createdDateTime,
+      modifiedTime: site.lastModifiedDateTime,
+    }))
+
+    logger.info(`[${requestId}] Successfully fetched ${sites.length} SharePoint sites`)
+    return NextResponse.json({ files: sites }, { status: 200 })
+  } catch (error) {
+    logger.error(`[${requestId}] Error fetching sites from SharePoint`, error)
+    return NextResponse.json({ error: 'Internal server error' }, { status: 500 })
+  }
+})

apps/sim/app/api/tools/sharepoint/upload/route.ts

@@ -0,0 +1,275 @@
+import { createLogger } from '@sim/logger'
+import { toError } from '@sim/utils/errors'
+import { type NextRequest, NextResponse } from 'next/server'
+import { sharepointUploadContract } from '@/lib/api/contracts/tools/microsoft'
+import { parseRequest } from '@/lib/api/server'
+import { checkInternalAuth } from '@/lib/auth/hybrid'
+import { secureFetchWithValidation } from '@/lib/core/security/input-validation.server'
+import { generateRequestId } from '@/lib/core/utils/request'
+import { withRouteHandler } from '@/lib/core/utils/with-route-handler'
+import { processFilesToUserFiles } from '@/lib/uploads/utils/file-utils'
+import { downloadServableFileFromStorage } from '@/lib/uploads/utils/file-utils.server'
+import { docNotReadyResponse } from '@/lib/uploads/utils/servable-file-response'
+import { assertToolFileAccess } from '@/app/api/files/authorization'
+import type { MicrosoftGraphDriveItem } from '@/tools/onedrive/types'
+import type { SharepointSkippedFile, SharepointUploadError } from '@/tools/sharepoint/types'
+
+export const dynamic = 'force-dynamic'
+
+const logger = createLogger('SharepointUploadAPI')
+const MAX_SHAREPOINT_UPLOAD_BYTES = 250 * 1024 * 1024
+
+export const POST = withRouteHandler(async (request: NextRequest) => {
+  const requestId = generateRequestId()
+
+  try {
+    const authResult = await checkInternalAuth(request, { requireWorkflowId: false })
+
+    if (!authResult.success || !authResult.userId) {
+      logger.warn(`[${requestId}] Unauthorized SharePoint upload attempt: ${authResult.error}`)
+      return NextResponse.json(
+        {
+          success: false,
+          error: authResult.error || 'Authentication required',
+        },
+        { status: 401 }
+      )
+    }
+
+    logger.info(
+      `[${requestId}] Authenticated SharePoint upload request via ${authResult.authType}`,
+      {
+        userId: authResult.userId,
+      }
+    )
+
+    const parsed = await parseRequest(sharepointUploadContract, request, {})
+    if (!parsed.success) return parsed.response
+    const validatedData = parsed.data.body
+
+    logger.info(`[${requestId}] Uploading files to SharePoint`, {
+      siteId: validatedData.siteId,
+      driveId: validatedData.driveId,
+      folderPath: validatedData.folderPath,
+      hasFiles: !!(validatedData.files && validatedData.files.length > 0),
+      fileCount: validatedData.files?.length || 0,
+    })
+
+    if (!validatedData.files || validatedData.files.length === 0) {
+      return NextResponse.json(
+        {
+          success: false,
+          error: 'At least one file is required for upload',
+        },
+        { status: 400 }
+      )
+    }
+
+    const userFiles = processFilesToUserFiles(validatedData.files, requestId, logger)
+
+    if (userFiles.length === 0) {
+      return NextResponse.json(
+        {
+          success: false,
+          error: 'No valid files to upload',
+        },
+        { status: 400 }
+      )
+    }
+
+    const siteId = validatedData.siteId.trim() || 'root'
+    const driveId = validatedData.driveId?.trim() || null
+    const uploadedFiles: MicrosoftGraphDriveItem[] = []
+    const skippedFiles: SharepointSkippedFile[] = []
+    const errors: SharepointUploadError[] = []
+
+    for (const userFile of userFiles) {
+      const denied = await assertToolFileAccess(userFile.key, authResult.userId, requestId, logger)
+      if (denied) return denied
+      logger.info(`[${requestId}] Uploading file: ${userFile.name}`)
+
+      let buffer: Buffer
+      let downloadedContentType = ''
+      try {
+        const result = await downloadServableFileFromStorage(userFile, requestId, logger)
+        buffer = result.buffer
+        downloadedContentType = result.contentType
+      } catch (error) {
+        const notReady = docNotReadyResponse(error)
+        if (notReady) return notReady
+        throw error
+      }
+
+      const fileName = validatedData.fileName || userFile.name
+      const folderPath = validatedData.folderPath?.trim() || ''
+
+      const fileSizeMB = buffer.length / (1024 * 1024)
+
+      if (buffer.length > MAX_SHAREPOINT_UPLOAD_BYTES) {
+        logger.warn(
+          `[${requestId}] File ${fileName} is ${fileSizeMB.toFixed(2)}MB, exceeds 250MB limit`
+        )
+        skippedFiles.push({
+          name: fileName,
+          size: buffer.length,
+          limit: MAX_SHAREPOINT_UPLOAD_BYTES,
+          reason: 'File exceeds the 250 MB Microsoft Graph small upload limit',
+        })
+        continue
+      }
+
+      let uploadPath = ''
+      if (folderPath) {
+        const normalizedPath = folderPath.startsWith('/') ? folderPath : `/${folderPath}`
+        const cleanPath = normalizedPath.endsWith('/')
+          ? normalizedPath.slice(0, -1)
+          : normalizedPath
+        uploadPath = `${cleanPath}/${fileName}`
+      } else {
+        uploadPath = `/${fileName}`
+      }
+
+      const encodedPath = uploadPath
+        .split('/')
+        .map((segment) => (segment ? encodeURIComponent(segment) : ''))
+        .join('/')
+
+      const uploadUrl = driveId
+        ? `https://graph.microsoft.com/v1.0/drives/${encodeURIComponent(driveId)}/root:${encodedPath}:/content`
+        : `https://graph.microsoft.com/v1.0/sites/${encodeURIComponent(siteId)}/drive/root:${encodedPath}:/content`
+
+      logger.info(`[${requestId}] Uploading to: ${uploadUrl}`)
+
+      const uploadResponse = await secureFetchWithValidation(
+        uploadUrl,
+        {
+          method: 'PUT',
+          headers: {
+            Authorization: `Bearer ${validatedData.accessToken}`,
+            'Content-Type': downloadedContentType || userFile.type || 'application/octet-stream',
+          },
+          body: buffer,
+        },
+        'uploadUrl'
+      )
+
+      if (!uploadResponse.ok) {
+        const errorData = await uploadResponse.json().catch(() => ({}))
+        logger.error(`[${requestId}] Failed to upload file ${fileName}:`, errorData)
+
+        if (uploadResponse.status === 409) {
+          // File exists - retry with conflict behavior set to replace
+          logger.warn(`[${requestId}] File ${fileName} already exists, retrying with replace`)
+          const replaceUrl = `${uploadUrl}?@microsoft.graph.conflictBehavior=replace`
+          const replaceResponse = await secureFetchWithValidation(
+            replaceUrl,
+            {
+              method: 'PUT',
+              headers: {
+                Authorization: `Bearer ${validatedData.accessToken}`,
+                'Content-Type':
+                  downloadedContentType || userFile.type || 'application/octet-stream',
+              },
+              body: buffer,
+            },
+            'replaceUrl'
+          )
+
+          if (!replaceResponse.ok) {
+            const replaceErrorData = (await replaceResponse.json().catch(() => ({}))) as {
+              error?: { message?: string }
+            }
+            logger.error(`[${requestId}] Failed to replace file ${fileName}:`, replaceErrorData)
+            errors.push({
+              name: fileName,
+              status: replaceResponse.status,
+              error: replaceErrorData.error?.message || `Failed to replace file: ${fileName}`,
+            })
+            continue
+          }
+
+          const replaceData = (await replaceResponse.json()) as {
+            id: string
+            name: string
+            webUrl: string
+            size: number
+            createdDateTime: string
+            lastModifiedDateTime: string
+          }
+          logger.info(`[${requestId}] File replaced successfully: ${fileName}`)
+
+          uploadedFiles.push({
+            id: replaceData.id,
+            name: replaceData.name,
+            webUrl: replaceData.webUrl,
+            size: replaceData.size,
+            createdDateTime: replaceData.createdDateTime,
+            lastModifiedDateTime: replaceData.lastModifiedDateTime,
+          })
+          continue
+        }
+
+        errors.push({
+          name: fileName,
+          status: uploadResponse.status,
+          error:
+            (errorData as { error?: { message?: string } }).error?.message ||
+            `Failed to upload file: ${fileName}`,
+        })
+        continue
+      }
+
+      const uploadData = (await uploadResponse.json()) as MicrosoftGraphDriveItem
+      logger.info(`[${requestId}] File uploaded successfully: ${fileName}`)
+
+      uploadedFiles.push({
+        id: uploadData.id,
+        name: uploadData.name,
+        webUrl: uploadData.webUrl,
+        size: uploadData.size,
+        createdDateTime: uploadData.createdDateTime,
+        lastModifiedDateTime: uploadData.lastModifiedDateTime,
+      })
+    }
+
+    if (uploadedFiles.length === 0) {
+      return NextResponse.json({
+        success: false,
+        error: 'No files were uploaded successfully',
+        output: {
+          uploadedFiles,
+          fileCount: 0,
+          skippedFiles,
+          skippedCount: skippedFiles.length,
+          errors,
+        },
+      })
+    }
+
+    logger.info(`[${requestId}] Completed SharePoint upload`, {
+      uploadedCount: uploadedFiles.length,
+      skippedCount: skippedFiles.length,
+      errorCount: errors.length,
+    })
+
+    return NextResponse.json({
+      success: true,
+      output: {
+        uploadedFiles,
+        fileCount: uploadedFiles.length,
+        skippedFiles,
+        skippedCount: skippedFiles.length,
+        errors,
+      },
+    })
+  } catch (error) {
+    logger.error(`[${requestId}] Error uploading files to SharePoint:`, error)
+    return NextResponse.json(
+      {
+        success: false,
+        error: toError(error).message,
+      },
+      { status: 500 }
+    )
+  }
+})