Upload files to Amazon S3 with ColdFusion. This is heavily based on code from Joe Danziger's s3.cfc: http://amazons3.riaforge.org/

Amazon S3 Upload.cfm

<cffunction name="uploadToAmazonS3">
	<cfargument name="fileName" required="true" />
	<cfargument name="contentType" required="true" />
	<cfargument name="data" required="true" />
	<cfargument name="acl" default="public-read" />
	<cfargument name="storageClass" default="STANDARD" />
	<cfargument name="HTTPtimeout" default="300" />
	<cfargument name="bucket" default="#getProperty('EmailAttachmentS3Bucket')#" />
	<cfargument name="accessKeyId" default="#getProperty('EmailAttachmentS3AccessKeyId')#" />
	<cfargument name="secretKey" default="#getProperty('EmailAttachmentS3SecretKey')#" />

	<cfset var dateTimeString = GetHTTPTimeString(Now())>

	<!--- authorization stuff --->
	<cfset var cs = "PUT\n\n#arguments.contentType#\n#dateTimeString#\nx-amz-acl:#arguments.acl#\nx-amz-storage-class:#arguments.storageClass#\n/#arguments.bucket#/#arguments.fileName#">
	<cfset var signature = createSignature(cs, arguments.secretKey)>

	<cfset var url = "http://s3.amazonaws.com/#arguments.bucket#/#arguments.fileName#" />

	<cfhttp method="PUT" url="#url#" timeout="#arguments.HTTPtimeout#">
		<cfhttpparam type="header" name="Authorization" value="AWS #arguments.accessKeyId#:#signature#">
		<cfhttpparam type="header" name="Content-Type" value="#arguments.contentType#">
		<cfhttpparam type="header" name="Date" value="#dateTimeString#">
		<cfhttpparam type="header" name="x-amz-acl" value="#arguments.acl#">
		<cfhttpparam type="header" name="x-amz-storage-class" value="#arguments.storageClass#">
		<cfhttpparam type="body" value="#arguments.data#">
	</cfhttp>
</cffunction>

<cffunction name="HMAC_SHA1" returntype="binary" access="private" output="false" hint="NSA SHA-1 Algorithm">
	<cfargument name="signKey" type="string" required="true" />
	<cfargument name="signMessage" type="string" required="true" />

	<cfset var jMsg = JavaCast("string",arguments.signMessage).getBytes("iso-8859-1") />
	<cfset var jKey = JavaCast("string",arguments.signKey).getBytes("iso-8859-1") />
	<cfset var key = createObject("java","javax.crypto.spec.SecretKeySpec") />
	<cfset var mac = createObject("java","javax.crypto.Mac") />

	<cfset key = key.init(jKey,"HmacSHA1") />
	<cfset mac = mac.getInstance(key.getAlgorithm()) />
	<cfset mac.init(key) />
	<cfset mac.update(jMsg) />

	<cfreturn mac.doFinal() />
</cffunction>

<cffunction name="createSignature" returntype="string" access="public" output="false">
	<cfargument name="in" required="true" />
	<cfargument name="secretKey" required="true" />

	<!--- Replace "\n" with "chr(10) to get a correct digest --->
	<cfset var fixedData = replace(arguments.in,"\n", chr(10), "all") />
	<!--- Calculate the hash of the information --->
	<cfset var digest = HMAC_SHA1(arguments.secretKey,fixedData) />
	<!--- fix the returned data to be a proper signature --->
	<cfset var signature = ToBase64(digest) />

	<cfreturn signature />
</cffunction>

This is a great, simple API implementation. Perfect for simple scenarios or to use as a starting point for more complex projects. Thanks for posting!

From Version 9.0.1 Coldfusion natively supports file upload to Amazon s3

<cfset s3bucket = "s3://yourbuketname/">
<cffile action="upload" filefield="filename" destination="#s3bucket#" nameconflict="makeunique" charset="utf-8" />

Because S3 doesn't recognize directories, you will need to put the file name in the destination and remove the filefield.