IsSourceInternal

Function IsSourceInternal(const aSourceNum : integer) : boolean;

Example

procedure ScriptEvent(var Value: variant);
begin
  Value := IsSourceInternal(1); // True: App
end;

Usage

IsSourceInternal returns true only for Velox's internal App source number 1.

Parameters and result

Item	Type	Description
aSourceNum	integer, const	Source number to classify.
Result	boolean	True only when aSourceNum = 1; otherwise False.

Behaviour and security boundary

• A False result means only “not the App constant”; it does not prove that the value is a valid external source.
• Zero, negative and future/unknown source numbers all return False.
• The source number is metadata, not authentication. Do not grant trust merely because a value equals 1 unless the surrounding Velox flow has established and protected that value.
• Use GetSourceCode and test for Null if validity as one of the current four source constants matters.
• IsSourcePartner is the exact complement and consequently returns True for invalid numbers.

Additional Technical Info

IsSourceInternal reports whether a numeric source is exactly Velox source 1 (App). Every other integer returns False, including all recognized external sources and invalid values.

Source classification

Value	Canonical source	Result
1	App	True
2	EDI	False
3	Web	False
4	API	False
any other integer	invalid/unknown	False

Implementation

The imported function is one exact expression: Result := (aSourceNum = 1). It does not call GetSourceCode, inspect request/session state or consult configuration.

Side effects, errors and performance

The function is pure, constant-time and performs no I/O. Every integer has a defined Boolean result.

Related entries

• IsSourcePartner negates this result.
• GetSourceCode and GetSourceNum provide the validated four-value mapping.

Created 2026-07-15