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Params

A framework agnostic library for validating input parameters.

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Installation

composer require danack/params

TL:DR - Using in an application

This library allows you to define a set of rules that define the expected input parameters, and then validate them.

As an example, this is what the code looks like in a controller for retrieving a list of articles:

function getArticles(Request $request)
{
 $getArticlesParams = GetArticlesParams::createFromRequest($request);

 echo "After Id: " . $articleGetIndexParams->getAfterId() . PHP_EOL;
 echo "Limit: " . $articleGetIndexParams->getLimit() . PHP_EOL;
}

The above example will throw a ValidationException with a list of all the validation problems if there are any.

Alternatively you can have the parameters and list of errors returned as tuple.

function getArticles(Request $request)
{
 [$getArticlesParams, $errors] = GetArticlesParams::createOrErrorFromVarMap($request);
 
 if ($errors !== null) {
 // do something about those errors.
 }

 echo "After Id: " . $articleGetIndexParams->getAfterId() . PHP_EOL;
 echo "Limit: " . $articleGetIndexParams->getLimit() . PHP_EOL;
}

Under the hood, basic usage

Given a set of rules, the library will extract the appropriate values from a 'variable map' and validate that the values meet the defined rules:

$rules = [
 'limit' => [
 new CheckSetOrDefault(10, $variableMap),
 new IntegerInput(),
 new MinIntValue(0),
 new MaxIntValue(100),
 ],
 'offset' => [
 new CheckSetOrDefault(null, $variableMap),
 new SkipIfNull(),
 new MinIntValue(0),
 new MaxIntValue(1000000),
 ],
];

list($limit, $offset) = Params::validate($params);

That code will extract the 'limit' and 'offset values from the variable map and check that the limit is an integer between 0 and 100, and that offset is either not set, or must be an integer between 0 and 1,000,000.

If there are any validation problems a ValidationException will be thrown. The validation problems can be retrieved from ValidationException::getValidationProblems.

Under the hood, basic usage without exceptions

Alternatively, you can avoid using exceptions for flow control:

$validator = new ParamsValidator();

$limit = $validator->validate('limit', [
 new CheckSetOrDefault(10, $variableMap),
 new IntegerInput(),
 new MinIntValue(0),
 new MaxIntValue(100),
]);

$offset = $validator->validate('offset', [
 new CheckSetOrDefault(null, $variableMap),
 new SkipIfNull(),
 new MinIntValue(0),
 new MaxIntValue(1000000),
]);

$errors = $validator->getValidationProblems();

if (count($errors) !== 0) {
 // return an error
 return [null, $errors];
}

// return an object with null 
return [new GetArticlesParams($order, $limit, $offset), null];

Tests

We have several tools that are run to improve code quality. Please run sh runTests.sh to run them all.

Pull requests should have full unit test coverage. Preferably also full mutation coverage through infection.

Related info

Json pointers - https://tools.ietf.org/html/rfc6901 JSON Patch - https://tools.ietf.org/html/rfc6902

Future work

Support Uri fragment encoding on paths

 # // the whole document
 #/foo ["bar", "baz"]
 #/foo/0 "bar"
 #/ 0
 #/a~1b 1
 #/c%25d 2
 #/e%5Ef 3
 #/g%7Ch 4
 #/i%5Cj 5
 #/k%22l 6
 #/%20 7
 #/m~0n 8

Parameter location

Some people care whether a parameter is in the query string or body. This library currently doesn't support differentiating them.

TODO

• colors.

• Error on unknown/invalid names. e.g. when the input include 'namme', and so the 'name' param uses default value, that sounds like an error.

• Generate OpenAPI stuff better.