ImageRule class
Validates that the file is an image.
Uses magic numbers (header bytes) to verify the actual file type, not just the extension or client-provided content type.
Signature: image
Examples:
image
Constructors
Properties
- customMessage ↔ String?
-
The error message to be returned if validation fails.
Can be overridden by the user.
getter/setter pairinherited
- hashCode → int
-
The hash code for this object.
no setterinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
- signature → String
-
Returns the unique signature of the rule.
Defaults to the class name in snake_case (logic handled by registry usually, but good to have).
no setteroverride
Methods
-
message(
ValidationContext context) → String -
Returns the validation error message.
override
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
passes(
ValidationContext context) → FutureOr< bool> -
Validates the value using the given
context.override -
toString(
) → String -
A string representation of this object.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited