AmazonS3 Configuration

The Size parameter of the ObjectList event is an integer, but the Amazon specifications allow object sizes up to 5GB. You can use this configuration setting inside of the ObjectList event to retrieve the object size exactly as it is reported by Amazon. This setting is not valid outside of the ObjectList event.

The ObjectsSize property is an integer, but Amazon allows object sizes up to 5GB. You can use this configuration setting to retrieve the full ObjectsSize property for any item in the Objects. For example, to get the size of the third object in the collection, (the item at index 2 of the Objects collection) you'd do the following:

  S3.Config("ObjectSize[2]");

When implementing chunked and resumable object downloads by setting the Range property, this configuration will contain the returned range of bytes and the total count of bytes for the specified object. This configuration will be populated after a call to GetObject

This setting optionally specifies the range of bytes to copy from the source object when calling CopyPart. By default the entire object is copied as the new part. When set, this setting dictates the 0-based range of bytes to copy in the format "first-last". For example: "2048-4096".

When encrypting or decrypting an object, set this to the initialization vector for the component to use when processing the data.

The keys and initialization vector which are used are generated based on a PKCS5 Password specification. However, if another utility generates keys based on a different scheme, setting the EncryptionKey and EncryptionIV may be used instead.

When decrypting or encrypting an object, set this to the key for the class to use when processing the data.

The keys and initialization vector which are used are generated based on a PKCS5 Password specification. However, if another utility generates keys based on a different scheme, setting the EncryptionKey and EncryptionIV may be used instead.

This contains the ETag for the object returned after GetObject is called.

When implementing chunked and resumable object downloads, the ETag is used to determine if the object has changed since the last chunk was downloaded. Set the IfMatch config to the ETag of the previous request to tell the class to make sure the object has not changed.

When implementing chunked and resumable object downloads, the IfMatch config is used to determine if the object has changed since the last chunk was downloaded. Set the IfMatch config to the ETag of the previous request to tell the class to make sure the object has not changed before a call to GetObject.

When set to False (default) the class will not enforce the bucket naming restrictions. US based buckets are not subject to the same name restrictions as other locations. When set to True the class will enforce the following restrictions:

• Bucket names can contain lowercase letters, numbers, periods, underscores, and dashes.
• Bucket names must start with a number or letter.
• Bucket names must be between 3 and 63 characters long.
• Bucket names should not end with a dash.
• Bucket names cannot contain two adjacent periods.
• Bucket names cannot contain dashes next to periods.
• Bucket names must not be formatted as an IP address (eg: 192.168.5.4).

If set to True the class will include the MD5 digest of the object data when CreateObject is called. The host will use this value to verify the data was not corrupted during transfer. The default value is False.

If set to True the class will include the MD5 digest of the part data when UploadPart is called. The host will use this value to verify the data was not corrupted during transfer. The default value is False.

This configuration may be queried after a call to ListObjects to find out whether or not the server sent all objects in the last listing. If all objects were not listed, the component automatically has set the ObjectMarker property to the last object from the current listing to begin the next listing.

This setting is also used in conjunction with ListParts in the same manner.

You may specify a location constraint so newly created objects are stored in the same location.

Amazon S3 also supports region-specific endpoints, which can be used by setting the URL config to the appropriate endpoint. Note that when using a region-specific endpoint, the LocationConstraint config must also be set to the same region.

The current location constraints supported by Amazon are:

Note that when using this setting in conjuction with the URL configuration setting, LocationConstraint should be set first to avoid overwriting the intended URL.

When calling ListParts a maximum of 1000 parts will be returned by default. This setting allows you to specify a different maximum number. If there are more than MaxParts parts returned, IsPaged will return True and ListParts should be called in a loop until IsPaged returns False in order to list all of the parts.

The maximum number of objects to be returned by ListObjects. The default value is -1, which does not send the server a limit on the amount to return.

This does not guarantee that all objects will be returned by the server. You may check the IsPaged config to see if more objects exist that were not returned in the listing. If there are more objects, call ListObjects again. The ObjectMarker will have been set to the next correct object marker for the new listing to begin.

This setting is populated and used automatically by the class when calling ListParts and greater than MaxParts are returned. In this cases the results are said to be paged and this value will hold the last result in the current set to act as a starting point for the next ListParts call. In normal usage you will not need to query or set this value. Refer to MaxParts and ListParts for more information on properly dealing with paged results.

When StorePrefixList is true, this field is populated with the common prefixes normally exposed in the PrefixList event. The values in the collection are based on the values in ObjectDelimiter and ObjectPrefix when ListObjects is called.

Valid array indices are from 0 to PrefixCount - 1.

When StorePrefixList is true, this field is populated with the number of common prefixes normally exposed in the PrefixList event.

When StorePrefixList is true, this field is populated with the common prefixes' other data normally exposed in the PrefixList event.

Valid array indices are from 0 to PrefixCount - 1.

Specifying a ProductToken allows the developer to charge a user based on their S3 usage.

By default the class will use the US East (N. Virginia) region. Set this configuration setting if the bucket is located in a different region.

Available Regions:

The SigningTime config can be used to send a custom value for the signature date that is used while signing all Amazon requests. This is often used if a machine has not been patched or is sending incorrect date values while attempting to connect to Amazon.

This value must be provided as a traditional UNIX timestamp. A UNIX timestamp is the number of seconds since the UNIX Epoch (January 1, 1970). An example value for the timestamp would be 1236626334.

This configuration setting can be used to instruct the component whether or not to create a local copy of the data to upload when setting the ObjectData property. When set to false, the component will store the data address and length only. This cuts down on the memory usage of the component when uploading files.

The default value for this setting is true.

If specified, this determines the Content-Type header returned by the S3 server. Note that this is only applicable when calling GetLink.

If specified, this determines the Content-Language header returned by the S3 server. Note that this is only applicable when calling GetLink.

If specified, this determines the Expires header returned by the S3 server. Note that this is only applicable when calling GetLink.

If specified, this determines the Cache-Control header returned by the S3 server. Note that this is only applicable when calling GetLink.

If specified, this determines the Content-Disposition header returned by the S3 server. Note that this is only applicable when calling GetLink.

If specified, this determines the Content-Encoding header returned by the S3 server. Note that this is only applicable when calling GetLink.

The signature version used in the request. The default value is "4".

Setting this option on the class allows you to control the storage class of an uploaded object. Valid options are:

NOTE: This option only applies to the CreateObject and CopyObject methods.

By default, this configuration setting is set to false. When set to true, the component will store the common prefixes (based on ObjectDelimiter and ObjectPrefix) normally exposed in the PrefixList event in Prefix[i]; and PrefixOtherData[i];.

If set, temporary files created during encryption and decryption will be put in the path specified. If no path is specified, the system's default temp directory will be used.

By default, this config is set to false. At the time of object creation, that is, when you are uploading a new object or making a copy of an existing object, you can specify if you want Amazon S3 to encrypt your data with AES256.

Specifying a UserToken allows the developer to charge a user based on their S3 usage.

This describes the API version as defined by Amazon of the current protocol. The default is set to the version that the class was designed around, but may be changed to a different version.

Amazon defines each version as the date it was released. An example is: "2009-07-15".

The following methods are supported: GET,PUT,HEAD,POST and DELETE and are only used when SendCustomRequest is called. The default value is "" (empty string) in which case the default HTTP methods are used (more details about the default behavior can be found on the SendCustomRequest page).

By default, this configuration is True, and when SendCustomRequest is called, the request will sign the specified request to authenticate with Amazon's servers. If set to False, the request will be sent as is, without signing.

By default, the class uses the Amazon URL for the service. Setting this config will override this value.

TBD

TBD

When AllowHTTPCompression is true, the class adds an "Accept-Encoding: " header to the request being sent to the server. By default, this header's value is "gzip, deflate". This config allows you to change the value of the "Accept-Encoding" header. NOTE: The class only supports gzip and deflate decompression algorithms.

This is the same as the AllowHTTPCompression property. This setting is exposed here for use by classs that inherit from HTTP.

By default the class does not allow redirects to the same URL to avoid redirect loops. In some cases the server may intentionally redirect the client back to the same URL. In that case this setting may be set to True to allow the redirect to be followed. The default value is False.

This setting determines whether data is appended when writing to LocalFile. When set to True downloaded data will be appended to LocalFile. This may be used in conjunction with Range to resume a failed download. This is only applicable when LocalFile is set. The default value is False.

If the Authorization property contains a non-empty string, an Authorization HTTP request header is added to the request. This header conveys Authorization information to the server.

This property is provided so that the HTTP class can be extended with other security schemes in addition to the authorization schemes already implemented by the class.

The AuthScheme property defines the authentication scheme used. In the case of HTTP Basic Authentication (default), every time User and Password are set, they are Base64 encoded, and the result is put in the Authorization property in the form "Basic [encoded-user-password]".

Returns the raw number of bytes from the HTTP response data, prior to the component processing the data, whether it is chunked and/or compressed. This returns the same value as the Transfer event, by BytesTransferred.

The default value is false. If set to true the URL passed to the class will be URL encoded.

This option determines what happens when the server issues a redirect. Normally, the class returns an error if the server responds with an "Object Moved" message. If this property is set to 1 (always), the new URL for the object is retrieved automatically every time.

If this property is set to 2 (Same Scheme), the new URL is retrieved automatically only if the URL Scheme is the same, otherwise the class fails with an error.

Note that following the HTTP specification, unless this option is set to 1 (Always), automatic redirects will be performed only for 'GET' or 'HEAD' requests. Other methods could potentially change the conditions of the initial request and create security vulnerabilities.

Furthermore, if either the new URL server and port are different than the existing one, User and Password are also reset to empty, unless this property is set to 1 (Always), in which case the same credentials are used to connect to the new server.

A Redirect event is fired for every URL the product is redirected to. In the case of automatic redirections, the Redirect event is a good place to set properties related to the new connection (e.g. new authentication parameters).

The default value is 0 (Never). In this case, redirects are never followed, and the class fails with an error instead.

Valid options are:

• 0 - Never
• 1 - Always
• 2 - Same Scheme

The default value is false. If set to true the class will perform a GET on the new location. Otherwise it will use the same HTTP method again.

Possible values include "1.0", and "1.1". The default is "1.1".

This is the same as the IfModifiedSince property. This setting is exposed here for use by classs that inherit from HTTP.

If true, the component will not send the 'Connection: Close' header. The absence of the Connection header indicates to the server that HTTP persistent connections should be used if supported. Note that not all server support persistent connections. You may also explicitly add the Keep-Alive header to the request headers by setting OtherHeaders to 'Connection: Keep-Alive'. If false, the connection will be closed immediately after the server response is received.

The default value for KeepAlive is false.

When FollowRedirects is set to any value besides frNever the class will follow redirects until this maximum number of redirect attempts are made. The default value is 20.

This configuration option can be set to a string of headers to be appended to the HTTP request headers.

The headers must be of the format "header: value" as described in the HTTP specifications. Header lines should be separated by CRLF ("\r\ n") .

Use this configuration option with caution. If this configuration option contains invalid headers, HTTP requests may fail.

This configuration option is useful for extending the functionality of the class beyond what is provided.

Similar to the Authorization config, but for proxy authorization. If this config contains a non-empty string, a Proxy-Authorization HTTP request header is added to the request. This header conveys proxy authorization information to the server. If ProxyUser and ProxyPassword are specified, this value is calculated using the algorithm specified by ProxyAuthScheme.

This is the same as ProxyAuthScheme. This setting is provided for use by classs that do not directly expose Proxy properties.

This is the same as ProxyPassword. This setting is provided for use by classs that do not directly expose Proxy properties.

This is the same as ProxyPort. This setting is provided for use by classs that do not directly expose Proxy properties.

This is the same as ProxyServer. This setting is provided for use by classs that do not directly expose Proxy properties.

This is the same as ProxyUser. This setting is provided for use by classs that do not directly expose Proxy properties.

If TransferredDataLimit is set to 0 (default), no limits are imposed. Otherwise this reflects the maximum number of incoming bytes that can be stored by the class.

This configuration setting returns the complete set of raw headers as received from the server.

If UseChunkedEncoding is set to true, the class will use HTTP chunked encoding when posting if possible. HTTP chunked encoding allows large files to be sent in chunks instead of all at once. If set to false, the class will not use HTTP chunked encoding. The default value is false.

Note: Some servers (such as the ASP.NET Development Server) may not support chunked encoding.

This is only applicable when UseChunkedEncoding is true. This setting specifies the chunk size in bytes to be used when posting data. The default value is 16384.

If True, the component will use the default HTTP client for the platform (URLConnection in Java, WebRequest in .NET, or CFHTTPMessage in Mac/iOS) instead of the internal HTTP implementation. This is important for environments where direct access to sockets is limited or not allowed (as in the Google AppEngine for instance).

Note: This setting is only applicable to Mac/iOS editions.

This is the value supplied in the HTTP User-Agent header. The default setting is "/n software IPWorks HTTP/S Component - www.nsoftware.com".

Override the default with the name and version of your software.

If the Service Principal Name on the Kerberos Domain Controller is not the same as the URL that you are authenticating to, the Service Principal Name should be set here.

When set, this configuration setting allows you to specify a different timeout value for establishing a connection. Otherwise, the class will use Timeout for establishing a connection and transmitting/receiving data.

This is the same as FirewallAutoDetect. This setting is provided for use by classs that do not directly expose Firewall properties.

If a FirewallHost is given, requested connections will be authenticated through the specified firewall when connecting.

If the FirewallHost setting is set to a Domain Name, a DNS request is initiated. Upon successful termination of the request, the FirewallHost setting is set to the corresponding address. If the search is not successful, an error is returned.

NOTE: This is the same as FirewallHost. This setting is provided for use by classs that do not directly expose Firewall properties.

If FirewallHost is specified, the FirewallUser and FirewallPassword settings are used to connect and authenticate to the given firewall. If the authentication fails, the class fails with an error.

NOTE: This is the same as FirewallPassword. This setting is provided for use by classs that do not directly expose Firewall properties.

Note that the FirewallPort is set automatically when FirewallType is set to a valid value.

NOTE: This is the same as FirewallPort. This setting is provided for use by classs that do not directly expose Firewall properties.

The appropriate values are as follows:

NOTE: This is the same as FirewallType. This setting is provided for use by classs that do not directly expose Firewall properties.

If the FirewallHost is specified, the FirewallUser and FirewallPassword settings are used to connect and authenticate to the Firewall. If the authentication fails, the class fails with an error.

NOTE: This is the same as FirewallUser. This setting is provided for use by classs that do not directly expose Firewall properties.

When set, TCPKeepAlive will automatically be set to true. By default the operating system will determine the time a connection is idle before a TCP keep-alive packet is sent. This system default if this value is not specified here is 2 hours. In many cases a shorter interval is more useful. Set this value to the desired interval in milliseconds.

Note: This value is not applicable in Java.

When set, TCPKeepAlive will automatically be set to true. A TCP keep-alive packet will be sent after a period of inactivity as defined by KeepAliveTime. If no acknowledgement is received from the remote host the keep-alive packet will be re-sent. This setting specifies the interval at which the successive keep-alive packets are sent in milliseconds. This system default if this value is not specified here is 1 second.

Note: This value is not applicable in Java or MAC.

When set, TCPKeepAlive will automatically be set to true. A TCP keep-alive packet will be sent after a period of inactivity as defined by KeepAliveTime. If no acknowledgement is received from the remote host the keep-alive packet will be re-sent. This setting specifies the number of times that the keep-alive packets will be re-sent before the remote host is considered disconnected. The system default if this value is not specified here is 9.

Note: This configuration setting is only available in the Unix platform, and isn't supported in Mac OS or FreeBSD.

This property controls how a connection is closed. The default is True.

In the case that Linger is True (default), there are two scenarios for determining how long the connection will linger. The first, if LingerTime is 0 (default), the system will attempt to send pending data for a connection until the default IP protocol timeout expires.

In the second scenario, LingerTime is a positive value, the system will attempt to send pending data until the specified LingerTime is reached. If this attempt fails, then the system will reset the connection.

The default behavior (which is also the default mode for stream sockets) might result in a long delay in closing the connection. Although the class returns control immediately, the system could hold system resources until all pending data is sent (even after your application closes).

Setting this property to False forces an immediate disconnection. If you know that the other side has received all the data you sent (by a client acknowledgment, for example), setting this property to False might be the appropriate course of action.

LingerTime is the time, in seconds, to leave the socket connection linger. This value is 0 by default, which means it will use the default IP protocol timeout.

The LocalHost setting contains the name of the local host as obtained by the gethostname() system call, or if the user has assigned an IP address, the value of that address.

In multi-homed hosts (machines with more than one IP interface) setting LocalHost to the value of an interface will make the class initiate connections (or accept in the case of server classs) only through that interface.

If the class is connected, the LocalHost setting shows the IP address of the interface through which the connection is made in internet dotted format (aaa.bbb.ccc.ddd). In most cases, this is the address of the local host, except for multi-homed hosts (machines with more than one IP interface).

This must be set before a connection is attempted. It instructs the class to bind to a specific port (or communication endpoint) in the local machine.

Setting this to 0 (default) enables the system to choose a port at random. The chosen port will be shown by LocalPort after the connection is established.

LocalPort cannot be changed once a connection is made. Any attempt to set this when a connection is active will generate an error.

This; setting is useful when trying to connect to services that require a trusted port in the client side. An example is the remote shell (rsh) service in UNIX systems.

MaxLineLength is the size of an internal buffer, which holds received data while waiting for an EOL string.

If an EOL string is found in the input stream before MaxLineLength bytes are received, the DataIn event is fired with the EOL parameter set to True, and the buffer is reset.

If no EOL is found, and MaxLineLength bytes are accumulated in the buffer, the DataIn event is fired with the EOL parameter set to False, and the buffer is reset.

The minimum value for MaxLineLength is 256 bytes. The default value is 2048 bytes. The maximum value is 65536 bytes.

This setting can be used to throttle outbound TCP traffic. Set this to the number of bytes to be sent per second. By default this is not set and there is no limit.

If set to a positive value, this setting defines the length of data records to be received. The class will accumulate data until RecordLength is reached and only then fire the DataIn event with data of length RecordLength. This allows data to be received as records of known length. This value can be changed at any time, including within the DataIn event.

The default value is 0, meaning this setting is not used.

If set to true, the socket's keep-alive option is enabled and keep-alive packets will be sent periodically to maintain the connection. Set KeepAliveTime and KeepAliveInterval to configure the timing of the keep-alive packets.

Note: This value is not applicable in Java.

When set to 0 (default), the class will use IPv4 exclusively. When set to 1, the class will use IPv6 exclusively. To instruct the class to prefer IPv6 addresses, but use IPv4 if IPv6 is not supported on the system, this setting should be set to 2. The default value is 0. Possible values are:

When true, the socket will send all data that is ready to send at once. When false, the socket will send smaller buffered packets of data at small intervals. This is known as the Nagle algorithm.

By default, this config is set to false.

If set to true, the component will reuse the context if and only if the following criteria are met:

• The target host name is the same.
• The system cache entry has not expired (default timeout is 10 hours).
• The application process that calls the function is the same.
• The logon session is the same.
• The instance of the component is the same.

This minimum cipher strength largely dependent on the security modules installed on the system. If the cipher strength specified is not supported, an error will be returned when connections are initiated.

Please note that this setting contains the minimum cipher strength requested from the security library. The actual cipher strength used for the connection is shown by the SSLStatus event.

Use this setting with caution. Requesting a lower cipher strength than necessary could potentially cause serious security vulnerabilities in your application.

When the provider is OpenSSL, SSLCipherStrength is currently not supported. This functionality is instead made available through the OpenSSLCipherList config setting.

Used to enable/disable the supported security protocols.

Not all supported protocols are enabled by default (the value of this setting is 4032). If you want more granular control over the enabled protocols, you can set this property to the binary 'OR' of one or more of the following values:

When the provider is OpenSSL, SSLCipherStrength is currently not supported. This functionality is instead made available through the OpenSSLCipherList config setting.

TLS 1.1 and TLS1.2 support are only available starting with Windows 7.

Change this setting to use security providers other than the system default.

Use this setting with caution. Disabling SSL security or pointing to the wrong provider could potentially cause serious security vulnerabilities in your application.

The special value "*" (default) picks the default SSL provider defined in the system.

Note: On Windows systems, the default SSL Provider is "Microsoft Unified Security Protocol Provider" and cannot be changed.

The following flags are defined (specified in hexadecimal notation). They can be or-ed together to exclude multiple conditions:

This functionality is currently not available when the provider is OpenSSL.

This functionality is available only when the provider is OpenSSL.

The path set by this property should point to a directory containing CA certificates in PEM format. The files each contain one CA certificate. The files are looked up by the CA subject name hash value, which must hence be available. If more than one CA certificate with the same name hash value exist, the extension must be different (e.g. 9d66eef0.0, 9d66eef0.1 etc). OpenSSL recommends to use the c_rehash utility to create the necessary links. Please refer to the OpenSSL man page SSL_CTX_load_verify_locations(3) for details.

This functionality is available only when the provider is OpenSSL.

The file set by this property should contain a list of CA certificates in PEM format. The file can contain several CA certificates identified by

-----BEGIN CERTIFICATE-----

... (CA certificate in base64 encoding) ...

-----END CERTIFICATE-----

sequences. Before, between, and after the certificates text is allowed which can be used e.g. for descriptions of the certificates. Please refer to the OpenSSL man page SSL_CTX_load_verify_locations(3) for details.

This functionality is available only when the provider is OpenSSL.

The format of this string is described in the OpenSSL man page ciphers(1) section "CIPHER LIST FORMAT". Please refer to it for details. The default string "DEFAULT" is determined at compile time and is normally equivalent to "ALL:!ADH:RC4+RSA:+SSLv2:@STRENGTH".

This functionality is available only when the provider is OpenSSL.

By default OpenSSL uses the device file "/dev/urandom" to seed the PRNG and setting OpenSSLPrngSeedData is not required. If set, the string specified is used to seed the PRNG.

If AbsoluteTimeout is set to True, any method which does not complete within Timeout seconds will be aborted. By default, AbsoluteTimeout is False, and the timeout is an inactivity timeout.

Note: This option is not valid for UDP ports.

When the firewall is a tunneling proxy, use this property to send custom (additional) headers to the firewall (e.g. headers for custom authentication schemes).

This is the size of an internal queue in the TCP/IP stack. You can increase or decrease its size depending on the amount of data that you will be receiving. Increasing the value of the InBufferSize setting can provide significant improvements in performance in some cases.

Some TCP/IP implementations do not support variable buffer sizes. If that is the case, when the class is activated the InBufferSize reverts to its defined size. The same happens if you attempt to make it too large or too small.

This is the size of an internal queue in the TCP/IP stack. You can increase or decrease its size depending on the amount of data that you will be sending. Increasing the value of the OutBufferSize setting can provide significant improvements in performance in some cases.

Some TCP/IP implementations do not support variable buffer sizes. If that is the case, when the class is activated the OutBufferSize reverts to its defined size. The same happens if you attempt to make it too large or too small.

If there are no events to process when DoEvents is called, the class will wait for the amount of time specified here before returning. The default value is 20.

The default code page is the Active Code Page (0).

The following is a list of valid code page identifiers:

The following is a list of valid code page identifiers for Mac OS only: