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conditions.ts
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conditions.ts
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import * as _ from 'lodash'
import * as inspect from 'util-inspect'
import { ExecutionContext } from '../rule-engine/rules'
export interface ConditionResolverMap {
[key: string]: (args: { [key: string]: any }, context: ExecutionContext) => Promise<boolean> | boolean
}
export const defaultConditionFields: string = `
"Always resolves to true"
always: Boolean!
"Whether value at path is within the specified precision of the value."
closeTo(path: String!, value: Float, valuePath: String precision: Int = 2): Boolean!
"Whether value at path equals provided value using strict equality comparison."
equalsNumber(path: String!, value: Int, valuePath: String): Boolean!
"Whether value at path equals provided JSON value after it is parsed into an object. Does a deep comparison."
equalsObject(path: String!, value: JSON, valuePath: String): Boolean!
"Whether value at path equals provided value using strict equality comparison."
equalsString(path: String!, value: String, valuePath: String): Boolean!
"Whether value at path is greater than value."
greaterThan(path: String!, value: Float, valuePath: String): Boolean!
"Whether value at path is greater than or equal to value."
greaterThanOrEqual(path: String!, value: Float, valuePath: String): Boolean!
"Whether the value at path includes a member that matches the specified value."
includesFloat(path: String!, value: Float, valuePath: String): Boolean!
"""
Whether the value at path includes a member that matches the specified value.
The value should be a JSON representing an object that will be passed to lodash's matches method.
"""
includesObject(path: String!, value: JSON, valuePath: String): Boolean!
"Whether the value at path includes a member that matches the specified value."
includesString(path: String!, value: String, valuePath: String): Boolean!
"Whether value at path is falsy."
isFalsy(path: String!): Boolean!
"Whether value at path is null."
isNull(path: String!): Boolean!
"Whether value at path is truthy."
isTruthy(path: String!): Boolean!
"Whether value at path is undefined."
isUndefined(path: String!): Boolean!
"Whether value at path is less than value."
lessThan(path: String!, value: Float, valuePath: String): Boolean!
"Whether value at path is less than or equal to value."
lessThanOrEqual(path: String!, value: Float, valuePath: String): Boolean!
"Whether value at path matches the JSON value. See lodash's match method for more information."
matchesObject(path: String!, value: JSON, valuePath: String): Boolean!
"Whether value at path matches the regular expression value."
matchesRegex(path: String!, value: String, valuePath: String, flags: String = ""): Boolean!
"Always resolves to false"
never: Boolean!
`
export const defaultConditionResolvers: ConditionResolverMap = {
always: () => true,
closeTo: ({ path, value, valuePath, precision }, context): boolean => {
const actualRaw = _.result(context, path)
const actual = Number(actualRaw)
const val = getValue(value, valuePath, context)
const pow = Math.pow(10, precision + 1)
const delta = Math.abs(val - actual)
const maxDelta = Math.pow(10, -precision) / 2
return Boolean((Math.round(delta * pow) / pow) <= maxDelta)
},
equalsNumber: ({ path, value, valuePath }, context): boolean => {
const actualRaw = _.result(context, path)
const actual = Number(actualRaw)
const val = getValue(value, valuePath, context)
return _.isEqual(actual, val)
},
equalsObject: ({ path, value, valuePath }, context): boolean => {
const val = getParsedValue(value, valuePath, context)
const actual = _.result(context, path)
return _.isEqual(actual, val)
},
equalsString: ({ path, value, valuePath }, context): boolean => {
const actualRaw = _.result(context, path)
const actual = String(actualRaw)
const val = getValue(value, valuePath, context)
return _.isEqual(actual, val)
},
greaterThan: ({ path, value, valuePath }, context): boolean => {
const actualRaw = _.result(context, path)
const actual = Number(actualRaw)
const val = getValue(value, valuePath, context)
return actual > val
},
greaterThanOrEqual: ({ path, value, valuePath }, context): boolean => {
const actualRaw = _.result(context, path)
const actual = Number(actualRaw)
const val = getValue(value, valuePath, context)
return actual >= val
},
includesFloat: ({ path, value, valuePath }, context): boolean => {
const actual = _.result(context, path)
const val = getValue(value, valuePath, context)
if (!_.isArray(actual)) {
return false
}
return actual.find((element) => element === val)
},
includesObject: ({ path, value, valuePath }, context): boolean => {
const val = getParsedValue(value, valuePath, context)
const actual = _.result(context, path)
if (!_.isArray(actual)) {
return false
}
return !!_.find(actual, val)
},
includesString: ({ path, value, valuePath }, context): boolean => {
const actual = _.result(context, path)
const val = getValue(value, valuePath, context)
if (!_.isArray(actual)) {
return false
}
return actual.find((element) => element === val)
},
isFalsy: ({ path }, context): boolean => {
const actual = _.result(context, path)
return !!!actual
},
isNull: ({ path }, context): boolean => {
const actual = _.result(context, path)
return actual === null
},
isTruthy: ({ path }, context): boolean => {
const actual = _.result(context, path)
return !!actual
},
isUndefined: ({ path }, context): boolean => {
const actual = _.result(context, path)
return actual === undefined
},
lessThan: ({ path, value, valuePath }, context): boolean => {
const actualRaw = _.result(context, path)
const actual = Number(actualRaw)
const val = getValue(value, valuePath, context)
return actual < val
},
lessThanOrEqual: ({ path, value, valuePath }, context): boolean => {
const actualRaw = _.result(context, path)
const actual = Number(actualRaw)
const val = getValue(value, valuePath, context)
return actual <= val
},
matchesObject: ({ path, value, valuePath }, context): boolean => {
const val = getParsedValue(value, valuePath, context)
const actual = _.result(context, path)
return _.isMatch(actual, val)
},
matchesRegex: ({ path, value, valuePath, flags }, context): boolean => {
const actualRaw = _.result(context, path)
const actual = String(actualRaw)
const val = getValue(value, valuePath, context)
const regex = RegExp(val, flags)
return regex.test(actual)
},
never: () => false,
}
function getValue (value: any, valuePath: string, context: ExecutionContext): any {
assertSingleValue(value, valuePath)
if (!_.isUndefined(value)) {
return value
}
return _.result(context, valuePath)
}
function getParsedValue (value: any, valuePath: string, context: ExecutionContext): any {
assertSingleValue(value, valuePath)
let val
if (!_.isUndefined(valuePath)) {
val = _.result(context, valuePath)
} else {
try {
val = JSON.parse(value)
} catch (e) {
throw new TypeError(`Invalid JSON. Did you remember to escape double quotes? Received: ${inspect(value)}`)
}
}
return val
}
function assertSingleValue (value, valuePath) {
if (!_.isUndefined(value) && !_.isUndefined(valuePath)) {
throw new Error('Cannot provide both value and valuePath!')
}
if (_.isUndefined(value) && _.isUndefined(valuePath)) {
throw new Error('Must provide either value or valuePath')
}
}