Quick way to list all files in Amazon S3 bucket?

Question

I have an amazon s3 bucket that has tens of thousands of filenames in it. What\'s the easiest way to get a text file that lists all the filenames in the bucket?

Answer 1

aws s3api list-objects --bucket bucket-name

For more details see here - http://docs.aws.amazon.com/cli/latest/reference/s3api/list-objects.html

Answer 2

You can use standard s3 api -

aws s3 ls s3://root/folder1/folder2/

Answer 3

I'd recommend using boto. Then it's a quick couple of lines of python:

from boto.s3.connection import S3Connection

conn = S3Connection('access-key','secret-access-key')
bucket = conn.get_bucket('bucket')
for key in bucket.list():
    print key.name.encode('utf-8')

Save this as list.py, open a terminal, and then run:

$ python list.py > results.txt

Answer 4

please try this bash script. it uses curl command with no need for any external dependencies

bucket=<bucket_name>
region=<region_name>
awsAccess=<access_key>
awsSecret=<secret_key>
awsRegion="${region}"
baseUrl="s3.${awsRegion}.amazonaws.com"

m_sed() {
  if which gsed > /dev/null 2>&1; then
    gsed "$@"
  else
    sed "$@"
  fi
}

awsStringSign4() {
  kSecret="AWS4$1"
  kDate=$(printf         '%s' "$2" | openssl dgst -sha256 -hex -mac HMAC -macopt "key:${kSecret}"     2>/dev/null | m_sed 's/^.* //')
  kRegion=$(printf       '%s' "$3" | openssl dgst -sha256 -hex -mac HMAC -macopt "hexkey:${kDate}"    2>/dev/null | m_sed 's/^.* //')
  kService=$(printf      '%s' "$4" | openssl dgst -sha256 -hex -mac HMAC -macopt "hexkey:${kRegion}"  2>/dev/null | m_sed 's/^.* //')
  kSigning=$(printf 'aws4_request' | openssl dgst -sha256 -hex -mac HMAC -macopt "hexkey:${kService}" 2>/dev/null | m_sed 's/^.* //')
  signedString=$(printf  '%s' "$5" | openssl dgst -sha256 -hex -mac HMAC -macopt "hexkey:${kSigning}" 2>/dev/null | m_sed 's/^.* //')
  printf '%s' "${signedString}"
}

if [ -z "${region}" ]; then
  region="${awsRegion}"
fi


# Initialize helper variables

authType='AWS4-HMAC-SHA256'
service="s3"
dateValueS=$(date -u +'%Y%m%d')
dateValueL=$(date -u +'%Y%m%dT%H%M%SZ')

# 0. Hash the file to be uploaded

# 1. Create canonical request

# NOTE: order significant in ${signedHeaders} and ${canonicalRequest}

signedHeaders='host;x-amz-content-sha256;x-amz-date'

canonicalRequest="\
GET
/

host:${bucket}.s3.amazonaws.com
x-amz-content-sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
x-amz-date:${dateValueL}

${signedHeaders}
e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"

# Hash it

canonicalRequestHash=$(printf '%s' "${canonicalRequest}" | openssl dgst -sha256 -hex 2>/dev/null | m_sed 's/^.* //')

# 2. Create string to sign

stringToSign="\
${authType}
${dateValueL}
${dateValueS}/${region}/${service}/aws4_request
${canonicalRequestHash}"

# 3. Sign the string

signature=$(awsStringSign4 "${awsSecret}" "${dateValueS}" "${region}" "${service}" "${stringToSign}")

# Upload

curl -g -k "https://${baseUrl}/${bucket}" \
  -H "x-amz-content-sha256: e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855" \
  -H "x-amz-Date: ${dateValueL}" \
  -H "Authorization: ${authType} Credential=${awsAccess}/${dateValueS}/${region}/${service}/aws4_request,SignedHeaders=${signedHeaders},Signature=${signature}"

Answer 5

In Java you can get the keys using ListObjects (see AWS documentation)

FileWriter fileWriter;
BufferedWriter bufferedWriter;
// [...]

AmazonS3 s3client = new AmazonS3Client(new ProfileCredentialsProvider());        

ListObjectsRequest listObjectsRequest = new ListObjectsRequest()
.withBucketName(bucketName)
.withPrefix("myprefix");
ObjectListing objectListing;

do {
    objectListing = s3client.listObjects(listObjectsRequest);
    for (S3ObjectSummary objectSummary : 
        objectListing.getObjectSummaries()) {
        // write to file with e.g. a bufferedWriter
        bufferedWriter.write(objectSummary.getKey());
    }
    listObjectsRequest.setMarker(objectListing.getNextMarker());
} while (objectListing.isTruncated());

Answer 6

AWS CLI can let you see all files of an S3 bucket quickly and help in performing other operations too.

To use AWS CLI follow steps below:

1. Install AWS CLI.
2. Configure AWS CLI for using default security credentials and default AWS Region.

3. To see all files of an S3 bucket use command

   aws s3 ls s3://your_bucket_name --recursive

Reference to use AWS cli for different AWS services: https://docs.aws.amazon.com/cli/latest/reference/