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Allow unknown value data types for VALUE #674

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merged 3 commits into from
Oct 22, 2024
Merged

Allow unknown value data types for VALUE #674

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9e72aca
Allow unknown value data types for VALUE
heiglandreas Sep 10, 2024
f7cef9c
Add tests for skipping unknown parameters
heiglandreas Oct 14, 2024
1f22f4a
Rework handling of values that are not recognized
heiglandreas Oct 14, 2024
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25 changes: 16 additions & 9 deletions lib/Document.php
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Original file line number Diff line number Diff line change
Expand Up @@ -180,23 +180,30 @@ public function createProperty(string $name, $value = null, ?array $parameters =

$class = null;

// If a VALUE parameter is supplied, we have to use that
// According to https://datatracker.ietf.org/doc/html/rfc5545#section-3.2.20
// If the property's value is the default value type, then this
// parameter need not be specified. However, if the property's
// default value type is overridden by some other allowable value
// type, then this parameter MUST be specified.
if (isset($parameters['VALUE'])) {
$class = $this->getClassNameForPropertyValue($parameters['VALUE']);
}

if ($valueType) {
// The valueType argument comes first to figure out the correct
// class.
$class = $this->getClassNameForPropertyValue($valueType);
}
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// If the value parameter is not set or set to something we do not recognize
// we do not attempt to interpret or parse the datass value as specified in
// https://datatracker.ietf.org/doc/html/rfc5545#section-3.2.20
// So when we so far did not get a class-name, we use the default for the property
if (is_null($class)) {
// If a VALUE parameter is supplied, we should use that.
if (isset($parameters['VALUE'])) {
$class = $this->getClassNameForPropertyValue($parameters['VALUE']);
if (is_null($class)) {
throw new InvalidDataException('Unsupported VALUE parameter for '.$name.' property. You supplied "'.$parameters['VALUE'].'"');
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The code used to be able to throw this exception if $parameters['VALUE'] had an invalid value (did not end up matching to a class).
Now, if $parameters['VALUE'] is not valid, the code will end up doing:
$class = $this->getClassNameForPropertyName($name);

That is, it will just ignore the invalid value, and use what has been passed in $name.

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I am surprised that no unit test has failed. I guess that there is not a unit test that covers the (now deleted) InvalidDataException

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@heiglandreas heiglandreas Oct 15, 2024 •
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Yes. As far as I see this part of RFC5545, Section 3.2.20 (Value Data Type)

Applications MUST preserve the value data for x-name and iana-token values that they don't recognize without attempting to interpret or parse the value data.

we need to allow to keep - but not interpret - VALUE information that we don't understand. That didn't work previously due to the Exception. That broke the whole process of interpretation.

The Exception has been introduced with c20acd7 about 8 years ago to have "A better error message for unsupported VALUE parameters." but even then there should have been no Exception as unsupported VALUE parameters IMO do not pose an error condition. They should not be interpreted, yes (what they are now), but not break the process but also be preserved for other tools to interpret that might be able to understand it.

That is the reason why the current process then falls back to the default value when "an invalid" - let's rephrase that to "a not recognized" - value is encountered.

}
} else {
$class = $this->getClassNameForPropertyName($name);
}
$class = $this->getClassNameForPropertyName($name);
}

if (is_null($parameters)) {
$parameters = [];
}
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