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util.ts
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import { Buffer } from 'buffer';
import CryptoJS from 'crypto-js/core';
import { monotonicFactory, ULID } from 'ulid';
import { v4 as uuid } from 'uuid';
import { ModelInstanceCreator } from './datastore/datastore';
import {
AllOperators,
isPredicateGroup,
isPredicateObj,
ModelInstanceMetadata,
PersistentModel,
PersistentModelConstructor,
PredicateGroups,
PredicateObject,
PredicatesGroup,
RelationshipType,
RelationType,
SchemaNamespace,
SortPredicatesGroup,
SortDirection,
} from './types';
export const exhaustiveCheck = (obj: never, throwOnError: boolean = true) => {
if (throwOnError) {
throw new Error(`Invalid ${obj}`);
}
};
export const isNullOrUndefined = (val: any): boolean => {
return typeof val === 'undefined' || val === undefined || val === null;
};
export const validatePredicate = <T extends PersistentModel>(
model: T,
groupType: keyof PredicateGroups<T>,
predicatesOrGroups: (PredicateObject<T> | PredicatesGroup<T>)[]
) => {
let filterType: keyof Pick<any[], 'every' | 'some'>;
let isNegation = false;
if (predicatesOrGroups.length === 0) {
return true;
}
switch (groupType) {
case 'not':
filterType = 'every';
isNegation = true;
break;
case 'and':
filterType = 'every';
break;
case 'or':
filterType = 'some';
break;
default:
exhaustiveCheck(groupType);
}
const result: boolean = predicatesOrGroups[filterType](predicateOrGroup => {
if (isPredicateObj(predicateOrGroup)) {
const { field, operator, operand } = predicateOrGroup;
const value = model[field];
return validatePredicateField(value, operator, operand);
}
if (isPredicateGroup(predicateOrGroup)) {
const { type, predicates } = predicateOrGroup;
return validatePredicate(model, type, predicates);
}
throw new Error('Not a predicate or group');
});
return isNegation ? !result : result;
};
const validatePredicateField = <T>(
value: T,
operator: keyof AllOperators,
operand: T | [T, T]
) => {
switch (operator) {
case 'ne':
return value !== operand;
case 'eq':
return value === operand;
case 'le':
return value <= operand;
case 'lt':
return value < operand;
case 'ge':
return value >= operand;
case 'gt':
return value > operand;
case 'between':
const [min, max] = <[T, T]>operand;
return value >= min && value <= max;
case 'beginsWith':
return (<string>(<unknown>value)).startsWith(<string>(<unknown>operand));
case 'contains':
return (
(<string>(<unknown>value)).indexOf(<string>(<unknown>operand)) > -1
);
case 'notContains':
return (
(<string>(<unknown>value)).indexOf(<string>(<unknown>operand)) === -1
);
default:
exhaustiveCheck(operator, false);
return false;
}
};
export const isModelConstructor = <T extends PersistentModel>(
obj: any
): obj is PersistentModelConstructor<T> => {
return (
obj && typeof (<PersistentModelConstructor<T>>obj).copyOf === 'function'
);
};
export const establishRelation = (
namespace: SchemaNamespace
): RelationshipType => {
const relationship: RelationshipType = {};
Object.keys(namespace.models).forEach((mKey: string) => {
relationship[mKey] = { indexes: [], relationTypes: [] };
const model = namespace.models[mKey];
Object.keys(model.fields).forEach((attr: string) => {
const fieldAttribute = model.fields[attr];
if (
typeof fieldAttribute.type === 'object' &&
'model' in fieldAttribute.type
) {
const connectionType = fieldAttribute.association.connectionType;
relationship[mKey].relationTypes.push({
fieldName: fieldAttribute.name,
modelName: fieldAttribute.type.model,
relationType: connectionType,
targetName: fieldAttribute.association['targetName'],
associatedWith: fieldAttribute.association['associatedWith'],
});
if (connectionType === 'BELONGS_TO') {
relationship[mKey].indexes.push(
fieldAttribute.association['targetName']
);
}
}
});
// create indexes from key fields
if (model.attributes) {
model.attributes.forEach(attribute => {
if (attribute.type === 'key') {
const { fields } = attribute.properties;
if (fields) {
fields.forEach(field => {
// only add index if it hasn't already been added
const exists = relationship[mKey].indexes.includes(field);
if (!exists) {
relationship[mKey].indexes.push(field);
}
});
}
}
});
}
});
return relationship;
};
const topologicallySortedModels = new WeakMap<SchemaNamespace, string[]>();
export const traverseModel = <T extends PersistentModel>(
srcModelName: string,
instance: T,
namespace: SchemaNamespace,
modelInstanceCreator: ModelInstanceCreator,
getModelConstructorByModelName: (
namsespaceName: string,
modelName: string
) => PersistentModelConstructor<any>
) => {
const relationships = namespace.relationships;
const modelConstructor = getModelConstructorByModelName(
namespace.name,
srcModelName
);
const relation = relationships[srcModelName];
const result: {
modelName: string;
item: T;
instance: T;
}[] = [];
const newInstance = modelConstructor.copyOf(instance, draftInstance => {
relation.relationTypes.forEach((rItem: RelationType) => {
const modelConstructor = getModelConstructorByModelName(
namespace.name,
rItem.modelName
);
switch (rItem.relationType) {
case 'HAS_ONE':
if (instance[rItem.fieldName]) {
let modelInstance: T;
try {
modelInstance = modelInstanceCreator(
modelConstructor,
instance[rItem.fieldName]
);
} catch (error) {
// Do nothing
}
result.push({
modelName: rItem.modelName,
item: instance[rItem.fieldName],
instance: modelInstance,
});
(<any>draftInstance)[rItem.fieldName] = (<PersistentModel>(
draftInstance[rItem.fieldName]
)).id;
}
break;
case 'BELONGS_TO':
if (instance[rItem.fieldName]) {
let modelInstance: T;
try {
modelInstance = modelInstanceCreator(
modelConstructor,
instance[rItem.fieldName]
);
} catch (error) {
// Do nothing
}
const isDeleted = (<ModelInstanceMetadata>(
draftInstance[rItem.fieldName]
))._deleted;
if (!isDeleted) {
result.push({
modelName: rItem.modelName,
item: instance[rItem.fieldName],
instance: modelInstance,
});
}
}
(<any>draftInstance)[rItem.targetName] = draftInstance[
rItem.fieldName
]
? (<PersistentModel>draftInstance[rItem.fieldName]).id
: null;
delete draftInstance[rItem.fieldName];
break;
case 'HAS_MANY':
// Intentionally blank
break;
default:
exhaustiveCheck(rItem.relationType);
break;
}
});
});
result.unshift({
modelName: srcModelName,
item: newInstance,
instance: newInstance,
});
if (!topologicallySortedModels.has(namespace)) {
topologicallySortedModels.set(
namespace,
Array.from(namespace.modelTopologicalOrdering.keys())
);
}
const sortedModels = topologicallySortedModels.get(namespace);
result.sort((a, b) => {
return (
sortedModels.indexOf(a.modelName) - sortedModels.indexOf(b.modelName)
);
});
return result;
};
export const getIndex = (rel: RelationType[], src: string): string => {
let index = '';
rel.some((relItem: RelationType) => {
if (relItem.modelName === src) {
index = relItem.targetName;
}
});
return index;
};
export const getIndexFromAssociation = (
indexes: string[],
src: string
): string => {
const index = indexes.find(idx => idx === src);
return index;
};
export enum NAMESPACES {
DATASTORE = 'datastore',
USER = 'user',
SYNC = 'sync',
STORAGE = 'storage',
}
const DATASTORE = NAMESPACES.DATASTORE;
const USER = NAMESPACES.USER;
const SYNC = NAMESPACES.SYNC;
const STORAGE = NAMESPACES.STORAGE;
export { USER, SYNC, STORAGE, DATASTORE };
let privateModeCheckResult;
export const isPrivateMode = () => {
return new Promise(resolve => {
const dbname = uuid();
let db;
const isPrivate = () => {
privateModeCheckResult = false;
resolve(true);
};
const isNotPrivate = async () => {
if (db && db.result && typeof db.result.close === 'function') {
await db.result.close();
}
await indexedDB.deleteDatabase(dbname);
privateModeCheckResult = true;
return resolve(false);
};
if (privateModeCheckResult === true) {
return isNotPrivate();
}
if (privateModeCheckResult === false) {
return isPrivate();
}
if (indexedDB === null) return isPrivate();
db = indexedDB.open(dbname);
db.onerror = isPrivate;
db.onsuccess = isNotPrivate;
});
};
const randomBytes = function(nBytes: number): Buffer {
return Buffer.from(CryptoJS.lib.WordArray.random(nBytes).toString(), 'hex');
};
const prng = () => randomBytes(1).readUInt8(0) / 0xff;
export function monotonicUlidFactory(seed?: number): ULID {
const ulid = monotonicFactory(prng);
return () => {
return ulid(seed);
};
}
/**
* Uses performance.now() if available, otherwise, uses Date.now() (e.g. react native without a polyfill)
*
* The values returned by performance.now() always increase at a constant rate,
* independent of the system clock (which might be adjusted manually or skewed
* by software like NTP).
*
* Otherwise, performance.timing.navigationStart + performance.now() will be
* approximately equal to Date.now()
*
* See: https://developer.mozilla.org/en-US/docs/Web/API/Performance/now#Example
*/
export function getNow() {
if (
typeof performance !== 'undefined' &&
performance &&
typeof performance.now === 'function'
) {
return performance.now() | 0; // convert to integer
} else {
return Date.now();
}
}
export function sortCompareFunction<T extends PersistentModel>(
sortPredicates: SortPredicatesGroup<T>
) {
return function compareFunction(a, b) {
// enable multi-field sort by iterating over predicates until
// a comparison returns -1 or 1
for (const predicate of sortPredicates) {
const { field, sortDirection } = predicate;
// reverse result when direction is descending
const sortMultiplier = sortDirection === SortDirection.ASCENDING ? 1 : -1;
if (a[field] < b[field]) {
return -1 * sortMultiplier;
}
if (a[field] > b[field]) {
return 1 * sortMultiplier;
}
}
return 0;
};
}
export const isAWSDate = (val: string): boolean => {
return !!/^\d{4}-\d{2}-\d{2}(Z|[+-]\d{2}:\d{2}($|:\d{2}))?$/.exec(val);
};
export const isAWSTime = (val: string): boolean => {
return !!/^\d{2}:\d{2}(:\d{2}(.\d{3})?)?(Z|[+-]\d{2}:\d{2}($|:\d{2}))?$/.exec(val);
};
export const isAWSDateTime = (val: string): boolean => {
return !!/^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}(:\d{2}(.\d{3})?)?(Z|[+-]\d{2}:\d{2}($|:\d{2}))?$/.exec(val);
};
export const isAWSTimestamp = (val: number): boolean => {
return !!/^\d+$/.exec(String(val));
};
export const isAWSEmail = (val: string): boolean => {
return !!/^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/.exec(val);
};
export const isAWSJSON = (val: string): boolean => {
try {
JSON.parse(val);
return true;
} catch {
return false;
}
};
export const isAWSURL = (val: string): boolean => {
try {
return !!new URL(val);
} catch {
return false;
}
};
export const isAWSPhone = (val: string): boolean => {
return !!/^\+?\d[\d\s-]+$/.exec(val);
};
export const isAWSIPAddress = (val: string): boolean => {
return !!/((^((([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5]))$)|(^((([0-9A-Fa-f]{1,4}:){7}([0-9A-Fa-f]{1,4}|:))|(([0-9A-Fa-f]{1,4}:){6}(:[0-9A-Fa-f]{1,4}|((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3})|:))|(([0-9A-Fa-f]{1,4}:){5}(((:[0-9A-Fa-f]{1,4}){1,2})|:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3})|:))|(([0-9A-Fa-f]{1,4}:){4}(((:[0-9A-Fa-f]{1,4}){1,3})|((:[0-9A-Fa-f]{1,4})?:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){3}(((:[0-9A-Fa-f]{1,4}){1,4})|((:[0-9A-Fa-f]{1,4}){0,2}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){2}(((:[0-9A-Fa-f]{1,4}){1,5})|((:[0-9A-Fa-f]{1,4}){0,3}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){1}(((:[0-9A-Fa-f]{1,4}){1,6})|((:[0-9A-Fa-f]{1,4}){0,4}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(:(((:[0-9A-Fa-f]{1,4}){1,7})|((:[0-9A-Fa-f]{1,4}){0,5}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:)))(%.+)?$))$/.exec(val);
};