chatgpt_aws_v4.scala

import java.security.MessageDigest
import java.text.SimpleDateFormat
import java.util.{Date, TimeZone}

object AwsV4Signer {
  def sign(accessKey: String, secretKey: String, method: String, url: String, payload: String): Map[String, String] = {
    val timestamp = getFormattedTimestamp()
    val credentialsScope = getCredentialsScope(timestamp)
    val canonicalRequest = getCanonicalRequest(method, url, payload, credentialsScope)
    val hashedCanonicalRequest = hash(canonicalRequest)
    val stringToSign = getStringToSign(timestamp, credentialsScope, hashedCanonicalRequest)
    val signingKey = getSigningKey(secretKey, credentialsScope)
    val signature = hmacSHA256(signingKey, stringToSign)
    val authorizationHeader = getAuthorizationHeader(accessKey, credentialsScope, signature)
    Map("Authorization" -> authorizationHeader, "X-Amz-Date" -> timestamp)
  }

  private def getFormattedTimestamp(): String = {
    val dateFormat = new SimpleDateFormat("yyyyMMdd'T'HHmmss'Z'")
    dateFormat.setTimeZone(TimeZone.getTimeZone("UTC"))
    dateFormat.format(new Date())
  }

  private def getCredentialsScope(timestamp: String): String = {
    val date = timestamp.substring(0, 8)
    s"$date/us-east-1/s3/aws4_request"
  }

  private def getCanonicalRequest(method: String, url: String, payload: String, credentialsScope: String): String = {
    val canonicalUri = getCanonicalUri(url)
    val canonicalQueryString = getCanonicalQueryString(url)
    val canonicalHeaders = getCanonicalHeaders(credentialsScope)
    val payloadHash = hash(payload)
    s"$method\n$canonicalUri\n$canonicalQueryString\n$canonicalHeaders\n$credentialsScope\n$payloadHash"
  }

  private def getCanonicalUri(url: String): String = {
    val uri = new java.net.URI(url)
    uri.getPath()
  }

  private def getCanonicalQueryString(url: String): String = {
    val uri = new java.net.URI(url)
    val query = uri.getQuery()
    if (query == null) "" else query
  }

  private def getCanonicalHeaders(credentialsScope: String): String = {
    s"host:s3.amazonaws.com\nx-amz-date:$timestamp\nx-amz-security-token:$securityToken\n"
  }

  private def getStringToSign(timestamp: String, credentialsScope: String, hashedCanonicalRequest: String): String = {
    s"AWS4-HMAC-SHA256\n$timestamp\n$credentialsScope\n$hashedCanonicalRequest"
  }

  private def getSigningKey(secretKey: String, credentialsScope: String): Array[Byte] = {
    val kDate = hmacSHA256(s"AWS4$secretKey", credentialsScope.substring(0, 8).getBytes("UTF-8"))
    val kRegion = hmacSHA256(kDate, "us-east-1".getBytes("UTF-8"))
    val kService = hmacSHA256(kRegion, "s3".getBytes("UTF-8"))
    hmacSHA256(kService, "aws4_request".getBytes("UTF-8"))
  }

  private def getAuthorizationHeader(accessKey: String, credentialsScope: String, signature: String): String = {
    s"AWS4-HMAC-SHA256 Credential=$accessKey/$credentialsScope, SignedHeaders

ScalaでAWS V4署名をするコード書いてください。ただしAWS SDKは使用しないでください。

以下はScalaでAWS V4署名をするコードの例です。この例では、アクセスキーとシークレットキー、リクエストのHTTPメソッド、エンドポイントURL、およびペイロードを使用して署名を生成します。