> ## Documentation Index
> Fetch the complete documentation index at: https://docs.drime.cloud/llms.txt
> Use this file to discover all available pages before exploring further.

# Sign Part URLs

> Get presigned URLs for uploading parts

## Overview

Gets presigned URLs for uploading one or more parts of a multipart upload. Parts can be uploaded concurrently (recommended limit: 8 concurrent uploads).

## Request Body

<ParamField body="key" type="string" required>
  S3 key from `createMultipartUpload`
</ParamField>

<ParamField body="uploadId" type="string" required>
  Upload ID from `createMultipartUpload`
</ParamField>

<ParamField body="partNumbers" type="array" required>
  Array of part numbers to sign (1-indexed)
</ParamField>

## Response

<ResponseField name="urls" type="array">
  Array of signed URL objects

  <Expandable title="URL object properties">
    <ResponseField name="partNumber" type="integer">
      Part number
    </ResponseField>

    <ResponseField name="url" type="string">
      Presigned URL for PUT upload
    </ResponseField>
  </Expandable>
</ResponseField>

<ResponseField name="status" type="string">
  Request status (`success`)
</ResponseField>

<RequestExample>
  ```bash cURL theme={null}
  curl -X POST https://app.drime.cloud/api/v1/s3/multipart/batch-sign-part-urls \
    -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
    -H "Content-Type: application/json" \
    -d '{
      "key": "uploads/1e4cbca8.../1e4cbca8...",
      "uploadId": "AFNhWKh6Cn6f...",
      "partNumbers": [1, 2, 3]
    }'
  ```

  ```javascript JavaScript theme={null}
  const PART_SIZE = 5 * 1024 * 1024; // 5MB
  const totalParts = Math.ceil(file.size / PART_SIZE);

  // Get URLs for all parts
  const response = await fetch('https://app.drime.cloud/api/v1/s3/multipart/batch-sign-part-urls', {
    method: 'POST',
    headers: {
      'Authorization': 'Bearer YOUR_ACCESS_TOKEN',
      'Content-Type': 'application/json'
    },
    body: JSON.stringify({
      key,
      uploadId,
      partNumbers: Array.from({ length: totalParts }, (_, i) => i + 1)
    })
  });

  const { urls } = await response.json();

  // Upload each part
  const uploadedParts = [];

  for (const { partNumber, url } of urls) {
    const start = (partNumber - 1) * PART_SIZE;
    const end = Math.min(start + PART_SIZE, file.size);
    const chunk = file.slice(start, end);
    
    const uploadResponse = await fetch(url, {
      method: 'PUT',
      body: chunk
    });
    
    const etag = uploadResponse.headers.get('ETag');
    uploadedParts.push({ PartNumber: partNumber, ETag: etag });
  }
  ```

  ```python Python theme={null}
  import requests
  import math

  PART_SIZE = 5 * 1024 * 1024  # 5MB
  file_size = 142557981
  total_parts = math.ceil(file_size / PART_SIZE)

  # Get URLs for all parts
  response = requests.post(
      'https://app.drime.cloud/api/v1/s3/multipart/batch-sign-part-urls',
      headers={'Authorization': 'Bearer YOUR_ACCESS_TOKEN'},
      json={
          'key': key,
          'uploadId': upload_id,
          'partNumbers': list(range(1, total_parts + 1))
      }
  )

  urls = response.json()['urls']
  ```
</RequestExample>

<ResponseExample>
  ```json 200 - Success theme={null}
  {
    "urls": [
      {
        "partNumber": 1,
        "url": "https://drimestorage.xxx.r2.cloudflarestorage.com/uploads/...?partNumber=1&..."
      },
      {
        "partNumber": 2,
        "url": "https://drimestorage.xxx.r2.cloudflarestorage.com/uploads/...?partNumber=2&..."
      },
      {
        "partNumber": 3,
        "url": "https://drimestorage.xxx.r2.cloudflarestorage.com/uploads/...?partNumber=3&..."
      }
    ],
    "status": "success"
  }
  ```
</ResponseExample>

<Tip>
  After uploading each part, save the `ETag` from the response headers. You'll need it to complete the upload.
</Tip>