GISBReceiver Component

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The GISBReceiver class is used to process EDI messages and generate receipts.

Syntax

ipworksedi.GISBReceiver

Remarks

The GISBReceiver implements server-side processing of EDI messages, as specified in versions 1.4 and 1.6 of the GISB/NAESB specification. It can be used to decrypt and verify incoming messages; in version 1.6, it may additionally be used to generate signed receipts. The component is designed to be easily incorporated into an HTTP server, and features custom functionality for server environments such as ASP.NET.

Basic Operation

The ProcessRequest method is used to process incoming messages and generate responses. ProcessRequest will parse the form data, determine DataFrom and DataTo, and then attempt to process any signed or encrypted data using PGP.

The following table defines possible values that may be passed to the SetPGPParam.

Finally, the component will generate a Response which you may send to the client with SendResponse.

The most important part of the Response is the RequestStatus; this property will contain either "ok" or an error message to be returned to the requesting client. By default the component will accept any post that conforms to the standard. If you want to be more restrictive you should first invoke ParseRequest to determine the sender, check the message security used, and extract the EDI data. If there is a problem you may then set RequestStatus to an error before calling CreateResponse. Please see the RequestStatus property for a list of standard error messages.

If you use version 1.4 of the GISB/NAESB protocol, the response will be a simple HTML reply. If you use version 1.6 the sender has the option of requesting a signed receipt. In all cases the response may be created with CreateResponse and sent with SendResponse.

To create log files, set LogDirectory prior to invoking ProcessRequest. This will log all incoming and outgoing data, and will also write the received EDI files to disk.

Additional Server-Side Functionality

When used in a server environment such as ASP, ASP.NET, etc., the component may be used to interface directly with the underlying HTTP context. If Request is not set by the user ParseRequest and ProcessRequest will first get the request from the underlying HTTP environment, if possible. SendResponse will send the reply in this environment if able; otherwise the reply will be directed to standard out.

Property List

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The following is the full list of the properties of the component with short descriptions. Click on the links for further details.

Method List

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The following is the full list of the methods of the component with short descriptions. Click on the links for further details.

Event List

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The following is the full list of the events fired by the component with short descriptions. Click on the links for further details.

Config Settings

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The following is a list of config settings for the component with short descriptions. Click on the links for further details.

DataElementCount Property (GISBReceiver Component)

The number of records in the DataElement arrays.

Syntax

func (obj *GISBReceiver) DataElementCount() (int32, error)
func (obj *GISBReceiver) SetDataElementCount(value int32) error

Default Value

0

Remarks

This property controls the size of the following arrays:

• DataElementName
• DataElementValue

The array indices start at 0 and end at DataElementCount - 1.

Data Type

int32

DataElementName Property (GISBReceiver Component)

The name of the current data element.

Syntax

func (obj *GISBReceiver) DataElementName(ElementIndex int32) (string, error)
func (obj *GISBReceiver) SetDataElementName(ElementIndex int32, value string) error

Default Value

""

Remarks

The name of the current data element.

The ElementIndex parameter specifies the index of the item in the array. The size of the array is controlled by the DataElementCount property.

Data Type

string

DataElementValue Property (GISBReceiver Component)

The value of the current data element.

Syntax

func (obj *GISBReceiver) DataElementValue(ElementIndex int32) (string, error)
func (obj *GISBReceiver) SetDataElementValue(ElementIndex int32, value string) error

Default Value

""

Remarks

The value of the current data element.

The ElementIndex parameter specifies the index of the item in the array. The size of the array is controlled by the DataElementCount property.

Data Type

string

DataFrom Property (GISBReceiver Component)

The identity of the sending system.

Syntax

func (obj *GISBReceiver) DataFrom() (string, error)

Default Value

""

Remarks

Will generally be the DUNS number of the sending trading partner.

This property is read-only.

Data Type

string

DataTo Property (GISBReceiver Component)

The identity of the receiving system.

Syntax

func (obj *GISBReceiver) DataTo() (string, error)

Default Value

""

Remarks

Will generally be the DUNS number of the receiving trading partner.

This property is read-only.

Data Type

string

ErrorMessage Property (GISBReceiver Component)

If the client sent an error notification, the error message.

Syntax

func (obj *GISBReceiver) ErrorMessage() (string, error)

Default Value

""

Remarks

ErrorMessage will be set in case the Request is an error notification rather than a post. The ErrorMessage will contain the entire contents of the error notification.

For example, the following might be returned:

orig-from=123456789*
orig-to=234567890*
orig-input-format=X12*
resp-time-c=11960619102855*
resp-server-id=coolhost*
resp-trans-id=234423897*
request-status=EEDM601: Public Key Invalid*
comments=Please contact 1-800-555-1212 for correct public key*

This property is read-only.

Data Type

string

EDIData Property (GISBReceiver Component)

This property contains the EDI payload of the transmission.

Syntax

func (obj *GISBReceiver) EDIData() ([]byte, error)

Default Value

""

Remarks

This property contains the EDI payload of the transmission.

In a receiver, this property will only be populated if EDIOutputStream has not been specified and ParseRequest finishes without an error. EDIData will contain the full decrypted text of the EDI message.

This property is read-only.

Data Type

[]byte

EDIType Property (GISBReceiver Component)

The EDIType of the EDI message.

Syntax

func (obj *GISBReceiver) EDIType() (string, error)

Default Value

"X12"

Remarks

The EDIType of the EDI message. The default value is "X12". EDIType may also be set to "error", in which case the message is an error relating to a previous message. In this case the ErrorMessage property and related properties will provide more information.

This property is read-only.

Data Type

string

EDIFileName Property (GISBReceiver Component)

In a sender, if FileName is specified, the file specified will be used for the EDI payload of the transmission.

Syntax

func (obj *GISBReceiver) EDIFileName() (string, error)

Default Value

""

Remarks

In a sender, if EDIFileName is specified, the file specified will be used for the EDI payload of the transmission. EDIName will be populated with the name of the file.

In a receiver, if this property is set prior to calling ParseFormData and ParseRequest the incoming data will be decrypted and written to the file at the specified path.

Note: When EDIOutputStream is set, the data will be written to the stream and this property will not be populated.

This property is read-only.

Data Type

string

EDIName Property (GISBReceiver Component)

Name is the final name to be associated with the contents of either the Data or FileName properties.

Syntax

func (obj *GISBReceiver) EDIName() (string, error)

Default Value

"rfc1767.edi"

Remarks

EDIName is the final name to be associated with the contents of either the EDIData or EDIFileName properties. This corresponds to the filename attribute of the Content-Disposition header for the EDI payload.

When constructing EDI data to be sent, EDIName will be set to the same value as EDIFileName, but can be overridden after setting EDIFileName to indicate that another name should be used in the outbound request's Content-Disposition MIME header.

When receiving EDI data, EDIName will be read out of the "filename" attribute of the inbound request's Content-Disposition MIME header.

This property is read-only.

Data Type

string

GISBVersion Property (GISBReceiver Component)

The version of the GISB/NAESB protocol used.

Syntax

func (obj *GISBReceiver) GISBVersion() (string, error)

Default Value

"1.4"

Remarks

The version of the GISB/NAESB protocol used. Note that when receiving documents the version will be determined automatically.

This property is read-only.

Data Type

string

LogDirectory Property (GISBReceiver Component)

The path to a directory for logging.

Syntax

func (obj *GISBReceiver) LogDirectory() (string, error)
func (obj *GISBReceiver) SetLogDirectory(value string) error

Default Value

""

Remarks

Setting LogDirectory will instruct the component to log the details of each transmission to unique files in the specified directory. For each request processed, the component will log the complete text of the incoming request, the EDI data (if it was able to be determined), and the outgoing response.

Two files will be written for each transmission. The diagnostic log will have the extension ".log" and will log the complete text of the incoming request, the EDI data (if it was able to be determined), and the outgoing response. The data file will have the extension ".dat" and will store the EDI data only. In case of error an additional file with extension ".err" file will be written, and the error information will also be written to the ".log" file.

The filenames will be chosen automatically by the component. Each filename will be the system time, in the format YYYY-MM-DD-HH-MM-SS-MMMM, with extensions "-2", "-3", used in case files of those names already exist. After each transaction is processed LogFile will contain the name of the files just written, minus the extension ".log" or ".dat".

If either log cannot be written an exception will be thrown; server applications should ensure that the server has the appropriate write permissions.

Data Type

string

LogFile Property (GISBReceiver Component)

The log file written.

Syntax

func (obj *GISBReceiver) LogFile() (string, error)

Default Value

""

Remarks

In case LogDirectory is specified two log files will be written in the specified directory and LogFile will contain the path. A diagnostic log will be written with filename LogFile + ".log" and the EDI data will be written with filename LogFile + ".dat". In case of error an additional file will be written with filename LogFile + ".err".

This property is read-only.

Data Type

string

PublicKeyringData Property (GISBReceiver Component)

Public keyring data.

Syntax

func (obj *GISBReceiver) PublicKeyringData() ([]byte, error)
func (obj *GISBReceiver) SetPublicKeyringData(value []byte) error

Default Value

""

Remarks

This property allows the public keyring data to be specific in the form of a byte array. Use this in conjunction with SecretKeyringData and the keyring will be loaded from this data instead of the homedir.

Data Type

[]byte

ReceiptSigningProtocol Property (GISBReceiver Component)

The protocol used to sign the receipt, if any.

Syntax

func (obj *GISBReceiver) ReceiptSigningProtocol() (string, error)
func (obj *GISBReceiver) SetReceiptSigningProtocol(value string) error

Default Value

""

Remarks

After you invoke ParseRequest this property will contain the signing protocol requested by the client (either an empty string or "pgp-signature"; other values are not supported). When you invoke CreateResponse this protocol will be used to sign the receipt.

Data Type

string

ReceiptType Property (GISBReceiver Component)

The type of receipt to be returned, if any.

Syntax

func (obj *GISBReceiver) ReceiptType() (string, error)

Default Value

""

Remarks

The type of receipt to be returned. If this property is empty a simple HTML response will be returned. For a value of "GISB-Acknowledgement-Receipt" a more detailed receipt will be generated.

Other values are not supported and will cause the component to throw an exception. You may, if you wish, catch this exception, generate your own Response, and send it using SendResponse.

This property is read-only.

Data Type

string

Request Property (GISBReceiver Component)

The HTTP request to be processed.

Syntax

func (obj *GISBReceiver) Request() ([]byte, error)
func (obj *GISBReceiver) SetRequest(value []byte) error

Default Value

""

Remarks

The body of the request to be processed. You may include the HTTP headers or specify them separately in RequestHeaders.

Typically the request may be read directly from the HTTP context, without setting this property.

Data Type

[]byte

RequestHeaders Property (GISBReceiver Component)

The HTTP headers in the request.

Syntax

func (obj *GISBReceiver) RequestHeaders() (string, error)
func (obj *GISBReceiver) SetRequestHeaders(value string) error

Default Value

""

Remarks

The entire list of HTTP and MIME headers.

Data Type

string

RequestStatus Property (GISBReceiver Component)

The status of the request.

Syntax

func (obj *GISBReceiver) RequestStatus() (string, error)
func (obj *GISBReceiver) SetRequestStatus(value string) error

Default Value

"ok"

Remarks

RequestStatus will be determined by ParseRequest or ProcessRequest, and will contain the string "ok" or an error message to be returned in the Response.

Errors relating to message processing (e.g., "EEDM104: Missing Data File") will automatically be discovered and reported by the component. Other types of errors are by mutual agreement. In particular the use of message security is not enforced by the component by default. To require encryption or signing set RequireEncryption or RequireSignature and specify error EEDM602 or EEDM604 as appropriate.

It is recommended that you set RequestStatus to one of the standard errors listed below. The specification additionally allows for a supplemental error message; separate this from the standard error with a semicolon. For example, "EEDM107: Invalid input format; expected X12."

The following is the complete list of error codes defined by the GISB 1.4 and NAESB 1.6 specification. Error codes only defined in version 1.6 are notated with "1.6" below, and errors that will be detected and reported automatically by the GISBReceiver component are indicated with an asterisk.

The following is the complete list of error codes defined by the GISB 1.4 specification.

EEDM100*: Missing From Common Code Identifier Code

EEDM101*: Missing To Common Code Identifier Code

EEDM102*: Missing Input Format

EEDM103*: Missing Data File

EEDM104: Missing Transaction Set

EEDM105: Invalid From Common Code Identifier

EEDM106: Invalid To Common Code Identifier

EEDM107: Invalid Input Format

EEDM108: Invalid Transaction Set

EEDM109: No Parameters Supplied

EEDM110: (1.6) Invalid "version"

EEDM111: (1.6) Missing "version"

EEDM112: (1.6) "receipt-security-selection" not mutually agreed

EEDM113*: (1.6) Invalid "receipt-security-selection"

EEDM114: (1.6) Missing "receipt-disposition-to"

EEDM115: (1.6) Invalid "receipt-disposition-to"

EEDM116: (1.6) Missing "receipt-report-type"

EEDM117: (1.6) Invalid "receipt-report-type"

EEDM118: (1.6) Missing "receipt-security-selection"

EEDM119: (1.6) Mutually agreed element, refnum, not present

EEDM601: Public Key Invalid

EEDM602: File Not Encrypted

EEDM603: Encrypted File Truncated

EEDM604*: Encrypted File Not Signed Or Signature Not Matched

EEDM699: Decryption Error

EEDM701: EDM Party Not Associated With EDI Party

EEDM702: Data Structure Error

EEDM703: Data Set Exchange Not Established For Trading Partner

EEDM999: System Error

WEDM100: Transaction Set Sent Not Mutually Agreed

WEDM102: (1.6) "receipt-security-selection" not mutually agreed

WEDM103: (1.6) Missing "receipt-security-selection"

WEDM104: (1.6) Element refnum received; not mutually agreed; ignored

Data Type

string

Response Property (GISBReceiver Component)

The response generated by the class.

Syntax

func (obj *GISBReceiver) Response() ([]byte, error)

Default Value

""

Remarks

The response generated by the component after invoking ProcessRequest or CreateResponse. The format of the response may range from a simple HTML response to a signed GISB-Acknowledgement-Receipt, depending on the client's request. In any case it will report success or failure as appropriate. If you wish to reject the request you may set RequestStatus to an appropriate value before invoking CreateResponse.

This property is read-only.

Data Type

[]byte

ResponseHeaders Property (GISBReceiver Component)

The response headers generated by the class.

Syntax

func (obj *GISBReceiver) ResponseHeaders() (string, error)

Default Value

""

Remarks

The response headers generated by the component after invoking ProcessRequest or CreateResponse. In general ResponseHeaders will consist of a single "Content-Type" header or an empty string.

This property is read-only.

Data Type

string

SecretKeyringData Property (GISBReceiver Component)

Secret keyring data.

Syntax

func (obj *GISBReceiver) SecretKeyringData() ([]byte, error)
func (obj *GISBReceiver) SetSecretKeyringData(value []byte) error

Default Value

""

Remarks

This property allows the secret keyring data to be specific in the form of a byte array. Use this in conjunction with PublicKeyringData and the keyring will be loaded from this data instead of the homedir.

Data Type

[]byte

ServerId Property (GISBReceiver Component)

The ID of your server.

Syntax

func (obj *GISBReceiver) ServerId() (string, error)
func (obj *GISBReceiver) SetServerId(value string) error

Default Value

""

Remarks

The ID of your server, as it will be described in the response. If you do not specify ServerId the component will attempt to determine it when you call ProcessRequest or CreateResponse.

Data Type

string

TransactionId Property (GISBReceiver Component)

The transaction ID of the message.

Syntax

func (obj *GISBReceiver) TransactionId() (string, error)
func (obj *GISBReceiver) SetTransactionId(value string) error

Default Value

""

Remarks

A unique ID for the transaction. In GISB a TransactionId will generated by the server whenever you process a request. You may either allow the component to generate unique values for TransactionId, or devise your own scheme and set TransactionId before invoking CreateResponse.

If you devise your own scheme you should set TransactionId after invoking ParseRequest as ParseRequest will generate a new ID for the request.

Data Type

string

Config Method (GISBReceiver Component)

Sets or retrieves a configuration setting.

Syntax

func (obj *GISBReceiver) Config(ConfigurationString string) (string, error)

Remarks

Config is a generic method available in every component. It is used to set and retrieve configuration settings for the component.

These settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the component, access to these internal properties is provided through the Config method.

To set a configuration setting named PROPERTY, you must call Config("PROPERTY=VALUE"), where VALUE is the value of the setting expressed as a string. For boolean values, use the strings "True", "False", "0", "1", "Yes", or "No" (case does not matter).

To read (query) the value of a configuration setting, you must call Config("PROPERTY"). The value will be returned as a string.

CreateResponse Method (GISBReceiver Component)

Creates the response.

Syntax

func (obj *GISBReceiver) CreateResponse() error

Remarks

Creates a response to the incoming request. The format of the request (signed receipt or simple HTML, for example) will depend on the request of the client.

ParseFormData Method (GISBReceiver Component)

Processes the form data, and populates the appropriate properties.

Syntax

func (obj *GISBReceiver) ParseFormData() error

Remarks

Invoking ParseFormData scans the form data, allowing you to determine the identity of the sender. The following properties will be populated: DataFrom, DataTo, EDIType, GISBVersion, and ReceiptType. ParseRequest may be used to read the entire message.

If RequestHeaders is empty and Request contains both the headers and the message, Request will be split and stored in Request and RequestHeaders as described in the Request's description.

ParseRequest Method (GISBReceiver Component)

Processes the EDI data.

Syntax

func (obj *GISBReceiver) ParseRequest() error

Remarks

Invoking ParseRequest parses the incoming request and attempts to determine the GISBData sent by the client. The method will first parse the form data unless you have already called ParseFormData.

The method will throw an exception if any errors are found. Regardless of success or failure the method will determine an appropriate value for RequestStatus. It is recommended that you catch any exceptions and invoke CreateResponse and SendResponse in case of either success or failure.

Invoking ProcessRequest is equivalent to invoking ParseRequest and then CreateResponse. Calling the methods separately allows you to change the value of RequestStatus before generating the response; for example, you may choose to feed GISBData to an EDI translator before generating a positive response.

ProcessRequest Method (GISBReceiver Component)

Processes the EDI data, and generates the receipt.

Syntax

func (obj *GISBReceiver) ProcessRequest() error

Remarks

Invoking ProcessRequest automates the entire server process. The method scans the request, determines the EDIData, and generates the Response and ResponseHeaders. The method's functionality is the same as the combined functionality of ParseFormData, ParseRequest, and CreateResponse.

The method will throw an exception if any errors are found. However, the Response will still be generated and will contain information about any errors. It is recommended that you catch any exceptions and invoke SendResponse in case of either success or failure.

The component will populate EDIData if possible.

ReadRequest Method (GISBReceiver Component)

Reads the AS2 request from the given HTTP servlet request.

Syntax

func (obj *GISBReceiver) ReadRequest() error

Remarks

In the Java edition, reads the request from the specified HttpServletRequest. The request will be stored in Request and the headers in RequestHeaders. ParseRequest may then be invoked.

In versions other than Java, this method has no effect.

Reset Method (GISBReceiver Component)

Resets the state of the control.

Syntax

func (obj *GISBReceiver) Reset() error

Remarks

Reset resets the state of the component. All properties will be set to their default values.

SendResponse Method (GISBReceiver Component)

In a server environment, responds to the requesting client.

Syntax

func (obj *GISBReceiver) SendResponse() error

Remarks

When called from within a server environment, SendResponse will respond to the requesting client with the Response. The Response may be a simple HTML block (this will always be the case in version 1.4) or a GISB-Acknowledgement-Receipt, if requested by the client.

The exact behavior of the method is specific to the environment. In ASP or ASP.NET, the receipt will be sent within the current HTTP context. In Java, the receipt will be sent within the provided HttpServletResponse. Otherwise, the receipt will be directed to stdout. If this is impossible an exception will be thrown.

This method should only be invoked after Response has been generated by CreateResponse or ProcessRequest.

SetPGPParam Method (GISBReceiver Component)

Sets a parameter in the PGP provider.

Syntax

func (obj *GISBReceiver) SetPGPParam(Name string, Value string) error

Remarks

Invoke SetPGPParam to set parameters of your PGP provider. Please refer to the documentation provided with the PGP provider for the parameters required.

The following table defines possible values that may be passed to the SetPGPParam.

Error Event (GISBReceiver Component)

Fired when information is available about errors during data delivery.

Syntax

// GISBReceiverErrorEventArgs carries the GISBReceiver Error event's parameters.
type GISBReceiverErrorEventArgs struct {...}

func (args *GISBReceiverErrorEventArgs) ErrorCode() int32
func (args *GISBReceiverErrorEventArgs) Description() string

// GISBReceiverErrorEvent defines the signature of the GISBReceiver Error event's handler function.
type GISBReceiverErrorEvent func(sender *GISBReceiver, args *GISBReceiverErrorEventArgs)

func (obj *GISBReceiver) GetOnErrorHandler() GISBReceiverErrorEvent
func (obj *GISBReceiver) SetOnErrorHandler(handlerFunc GISBReceiverErrorEvent)

Remarks

The Error event is fired in case of exceptional conditions during message processing. Normally the component fails with an error.

The ErrorCode parameter contains an error code, and the Description parameter contains a textual description of the error. For a list of valid error codes and their descriptions, please refer to the Error Codes section.

Log Event (GISBReceiver Component)

Fired with log information while processing a message.

Syntax

// GISBReceiverLogEventArgs carries the GISBReceiver Log event's parameters.
type GISBReceiverLogEventArgs struct {...}

func (args *GISBReceiverLogEventArgs) LogType() string
func (args *GISBReceiverLogEventArgs) LogMessage() []byte

// GISBReceiverLogEvent defines the signature of the GISBReceiver Log event's handler function.
type GISBReceiverLogEvent func(sender *GISBReceiver, args *GISBReceiverLogEventArgs)

func (obj *GISBReceiver) GetOnLogHandler() GISBReceiverLogEvent
func (obj *GISBReceiver) SetOnLogHandler(handlerFunc GISBReceiverLogEvent)

Remarks

This event fires once for each log message generated by the component. The verbosity is controlled by the LogLevel setting.

Log messages available through this event correspond to log files written to LogDirectory. This event provides a way to obtain log messages without relying on files on disk. This event fires regardless of the value of LogDirectory (i.e. when LogDirectory is empty the event will still fire).

The LogMessage event parameter holds the raw log data.

The LogType event parameter indicates the type of log. Possible values are:

Config Settings (GISBReceiver Component)

The component accepts one or more of the following configuration settings. Configuration settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the component, access to these internal properties is provided through the Config method.

GISBReceiver Config Settings

Base Config Settings

Trappable Errors (GISBReceiver Component)

GISBReceiver Errors

MIME Errors