b2_copy_part

Copies from an existing B2 file, storing it as a part of a large file which has already been started (with b2_start_large_file).

When calling b2_copy_part, by default the entire source file will be copied to the destination. If you wish, you may supply a range param to only copy a portion of the source file over.

Request

Request HTTP Headers

Request HTTP Message Body Parameters

Response

Response HTTP Status 200

File successfully copied. The JSON response will contain the standard part information. For copied files, the action is always "copy".

fileId

The file ID for uploading this file.

partNumber

Which part this is.

contentLength

The number of bytes stored in the part.

contentSha1

The SHA1 of the bytes stored in the part.

contentMd5

optional

The MD5 of the bytes stored in the part. Not all parts have an MD5 checksum, so this field is optional, and set to null for parts that do not have one.

uploadTimestamp

This is a UTC time when this part was uploaded. It is a base 10 number of milliseconds since midnight, January 1, 1970 UTC. This fits in a 64 bit integer such as the type "long" in the programming language Java. It is intended to be compatible with Java's time long. For example, it can be passed directly into the java call Date.setTime(long time).

Response Errors

File not copied. If possible the server will return a JSON error structure. Errors include:

Sample Code

Code

ACCOUNT_AUTHORIZATION_TOKEN=''; # Provided by b2_authorize_account
API_URL=''; # Provided by b2_authorize_account
SOURCE_FILE_ID=''; # The file you wish to copy
LARGE_FILE_ID=''; # Provided by b2_start_large_file
curl \
    -H "Authorization: $ACCOUNT_AUTHORIZATION_TOKEN" \
    -d "`printf '{"sourceFileId":"%s","largeFileId":"%s","partNumber":1,"range":"bytes=0-4999999"}' $SOURCE_FILE_ID $LARGE_FILE_ID`" \
    "$API_URL/b2api/v2/b2_copy_part";

Output

{
  "contentLength": 5000000,
  "contentSha1": "e8daf2cae7b77beb23a246aec2c6d3ede06089c9",
  "fileId": "LARGE_FILE_ID",
  "partNumber": 1,
  "uploadTimestamp": 1559581682460
}

Code

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.charset.StandardCharsets;

public class B2CopyPart {

    public static void main(String[] args) throws IOException {
        final String apiUrl = ""; // Provided by b2_authorize_account
        final String accountAuthorizationToken = ""; // Provided by b2_authorize_account
        final String sourceFileId = ""; // The file you wish to copy
        final String largeFileId = ""; // Provided by b2_start_large_file
        final String partNumber = "1";

        final URL url = new URL(apiUrl + "/b2api/v2/b2_copy_part");
        final HttpURLConnection connection = (HttpURLConnection) url.openConnection();

        try {
            connection.setRequestMethod("POST");
            connection.setRequestProperty("Authorization", accountAuthorizationToken);

            connection.setDoOutput(true);
            DataOutputStream writer = new DataOutputStream(connection.getOutputStream());
            writer.write((
                    "{"
                            + "\"sourceFileId\": \"" + sourceFileId + "\","
                            + "\"largeFileId\": \"" + largeFileId + "\","
                            + "\"partNumber\": " + partNumber
                            + "}").getBytes(StandardCharsets.UTF_8)
            );
            final InputStream in = new BufferedInputStream(connection.getInputStream());
            final String jsonResponse = inputStreamToString(in);

            System.out.println(jsonResponse);
        } finally {
            connection.disconnect();
        }
    }

    private static String inputStreamToString(InputStream in) throws IOException {
        InputStreamReader reader = new InputStreamReader(in);
        StringBuilder sb = new StringBuilder();
        int c = reader.read();
        while (c != -1) {
            sb.append((char) c);
            c = reader.read();
        }
        reader.close();
        return sb.toString();
    }

}

Output

{
  "contentLength": 99212871,
  "contentSha1": "c604542967a93466d4ed087956753161cfab3f31",
  "fileId": "LARGE_FILE_ID",
  "partNumber": 1,
  "uploadTimestamp": 1559584243788
}

Code

import json
import urllib2

api_url = '' # Provided by b2_authorize_account
account_authorization_token = '' # Provided by b2_authorize_account
source_file_id = '' # The file you wish to copy
large_file_id = '' # Provided by b2_start_large_file
part_number = 1
request = urllib2.Request(
    '%s/b2api/v2/b2_copy_part' % api_url,
    json.dumps({
      'sourceFileId' : source_file_id,
      'largeFileId': large_file_id,
      'partNumber': part_number,
    }),
    headers = {
        'Authorization': account_authorization_token
    })
response = urllib2.urlopen(request)
response_data = json.loads(response.read())
print(json.dumps(response_data, indent=2))
response.close()

Output

{
  "uploadTimestamp": 1559585618236,
  "contentLength": 99212871,
  "fileId": "LARGE_FILE_ID",
  "partNumber": 1,
  "contentSha1": "c604542967a93466d4ed087956753161cfab3f31"
}

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