user-properties

user-properties

Library that help enforce user field properties.

More specifically, it is meant to retrieve implementation properties based on more fundamental ones.

I intend to use it to improve the flexibility, API quality and overall design of the user-store and express-user-local projects.

Requirements

• A recent version of Node.js (version 0.10.25 is installed on my machine) [1]

[1] Later versions should also work. If you find it not to be the case, let me know.

Installation

npm install user-properties

Running Tests

In the directory where the module is located, run the following 2 commands on the prompt:

• npm install
• npm test

Usage

Constructor

The library takes an object as input and returns a schema object.

The object should have the following structure:

{'Field1': <Field1Properties>, 'Field2': <Field2Properties>, ..., 'FieldN': <FieldnProperties>}

The properties of each field are as follow:

• Required: Specify whether or not the field should exist for every user. It takes the boolean values of true or false.
• Unique: Specify whether or not the field should be unique to every user. It takes the boolean values of true or false.
• Privacy: Specifies how private the information in the field is. It can be Module.Privacy.Public, Module.Privacy.Private or Module.Privacy.Secret. Public means publicly available information (ex: Username), Private means restricted, but not secret information (ex: home address) and Secret means information that only the user should have easy access to (ex: password)
• Mutable: Specifies whether or not the information in the field should change. It takes the boolean values of true or false.
• Retrievable: Specifies whether or not the information in the field needs to be retrieved in its original format. It takes the boolean values of true or false.
• Description: Function that describes the field by returning true or false against a candidate value for the field. The candidate value is expected to be the single argument the function takes.
• Access: Method user has to retrieve the value of the property (ex: 'User', 'Email', 'Phone', etc). It takes the value of a string.
• Sources: Specifies what mecanisms are used to create/change the value of the field. It takes the value of an array of strings.
• Generator: Function that generates a suitable random value for the field. It can be an asynchronous call in which case the expected callback signature should be: function(Err, GeneratedValue). If synchronous, it should just return the result.
• Stringify: Function that transforms a value for a field into its string equivalent. Its sole argument is the value to transform.
• Parse: Function that converts a string representation for a value of the field into its native equivalent. It's sole argument is the string to transform.

Properties Defaults

• Required: false
• Unique: false
• Privacy: UserProperties.Privacy.Public
• Mutable: true
• Retrievable: true
• Access: 'User'
• Description: A function that always returns true
• Sources: ['User'] (an array containing only the string 'User')
• Generator: null
• Stringify: A function that returns a String argument unchanged and passes other types of argument to JSON.stringify, returning the result
• Parse: A function that returns its argument unchanged

Calls

• Instance.Parse(Field, Value, Parse)

Pass 'Value' to the 'Parse' property of 'Field' and returns the result.

• Instance.Stringify(Field, Value, Parse)

Pass 'Value' to the 'Stringify' property of 'Field' and returns the result.

• Instance.Validate(Field, Value, Parse)

Returns true if 'Value' returns true when passed to the 'Descriptor' of 'Field', else it returns false.

If 'Parse' is true, the return value of the 'Parse' method with 'Value' as its argument is passed to the 'Descriptor' of 'Field' instead.

• Instance.ListComplement(Set)

Return all fields that are not present in 'Set'.

• Instance.ListHashable()

Returns an array of all fields that are hashable (not Retrievable and Privacy is not Public)

• Instance.ListLogin(Source)

Returns an array of all fields that are suitable to login the user with (Required, Unique and Privacy is not Public). If the 'Source' argument is definedm Access===Source is also a requirement.

• Instance.ListAuth(Source)

Returns an array of all fields that are suitable to authentify a given source (Private, Required, Privacy is Secret. If 'Source' is defined, Access===Source is also a requirement)

• Instance.ListID()

Returns an array of all fields that are suitable to uniquely identify a user (Required and Unique)

• Instance.List(Property, Value)

Returns an array of all fields whose defined by 'Property' is equal to the value defined by 'Value'. If no arguments are passed, all fields are returned.

• Instance.ListEditable(Source)

Returns an array of all the fields that are modifiable (Mutable). If 'Source' is defined, Access===Source is also a requirement.

• Module.ListIntersection(SetA, SetB)

Returns an array of all elements present in both SetA and SetB.

• Module.ListUnion(SetA, SetB)

Returns an array of all elements present in at least one of SetA or SetB.

• Instance.ListIn(Field, Value)

Returns an array of all fields where 'Property' is an array-like container (ie, needs to have the 'some' method defined) which contains the value 'Value'.

• Instance.ListGeneratable()

Returns an array of all fields where an automated value could be generated after the field is initially created. This requires both 'Auto' to be listed in the field's Sources and the field to be mutable.

• Instance.Generate(Field, Callback)

Calls the Generator property to generate a value for the field. The Callback is optional.

If Callback is undefined, the Generate method will assume that the field's Generator property is a synchronous function and return its result.

If Callback is defined, the Generate method will pass it as an argument to the Generator. If the Field doesn't have a Generator, the Generate method will call Callback directly, passing it an error as it's first argument and null as its second.

• Instance.In(Field, Property, Value)

Returns true if 'Property' of 'Field' is an array and contains 'Value', else returns false.

• Instance.Is(Field, Property, Value)

Returns true if 'Property' of 'Field' is strictly equal (===) to 'Value', else returns false.

• Instance.Is(Field, Properties)

Variation on the above call, where 'Properties' is an object whose property/value pairs represent properties/values to test in 'Field'.

Example

I highly recommend you take a look at the test file to see how this library should be use.

The test file handles the classical case of a user that has the following fields: Username, Email, Password, Gender, Age and EmailToken.

Future

Potential new calls/properties as I find use for them

Versions History

3.4.1

Fixed markeup error in doc.

3.4.0

• Added 'Parse' and 'Stringify' both as properties and methods.
• Added optional 'Parse' argument to 'Validate' method'
• Added test cases for passing inexistent Field argument to various methods.
• Added check to make sure the Field argument exists in 'Generate', 'Is' and 'In' methods.
• Made the default values for various properties more readable in the doc.

3.3.0

• Added optional 'Source' argument to 'ListLogin' method.

3.2.0

• Added 'Is' and 'In' methods to directly test properties in fields.

3.1.0

• Added 'ListUnion' method.
• Bit of refactoring on tests.

3.0.1

• Added some missing documentation.

3.0.0

• Renamed 'Generators' property to 'Sources'.
• Renamed 'ListPostable' method to 'ListGeneratable'.
• Added 'Generator' property and a 'Generate' method.
• Added the 'uid-safe' project to the dev dependencies.

2.1.0

• Added 'Generators' property.
• Added 'ListIn' and 'ListPostable' methods.

2.0.0

• Condensed the 'Private' and 'Secret' properties into a single property called 'Privacy' which can be Public, Private or Secret.
• Condensed 'GenAuth' and 'GenConfirm' methods into a single method called 'ListAuth'
• Condensed 'GenPublic', 'GenRequired', 'GenAccess' and 'GenAll' methods into a single method called 'List' which takes arguments to differential the property you are intersted in.
• Refactored internal variable names for greater readability and correctness.
• Gave the following methods slightly more intuitive names:
• 'GenRestrictions' was renamed to 'GetRestrictions'
• 'GenHash' was renamed to 'ListHashable'
• 'GenComplement' was renamed to 'ListComplement'
• 'GenIntersection' was renamed to 'ListIntersection'
• 'GenAccess' was renamed to 'ListAccessible'
• 'GenRequired' was renamed to 'ListRequired'
• 'GenIdentify' was renamed to 'ListID'
• 'GenPublic' was renamed to 'ListPublic'
• 'GenLogin' was renamed to 'ListLogin'
• 'GenEditable' was renamed to 'ListEditable'

1.4.0

Added 'GenAccess' and 'GenIntersection' methods.

1.3.0

• Added 'Access' property and 'GenConfirm' method.
• Added 'Source' verification to 'GenEditable' method.

1.2.0

Added GenComplement method.

1.1.0

Added GenAll method.

1.0.0

Initial Release