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authorBrandon Millman <brandon.millman@gmail.com>2017-11-14 05:25:21 +0800
committerBrandon Millman <brandon.millman@gmail.com>2017-11-14 06:07:33 +0800
commit1147cb56ba4415cd0217cbbad5ca03bb5a8e523a (patch)
tree7b249fca5c631a51fb6af299b6ca608002682e32 /packages/assert/src/index.ts
parent2b26981e3dbf82d0ea5f6e526485f94da4fdbd1e (diff)
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Add assert package to the monorepo
Diffstat (limited to 'packages/assert/src/index.ts')
-rw-r--r--packages/assert/src/index.ts84
1 files changed, 84 insertions, 0 deletions
diff --git a/packages/assert/src/index.ts b/packages/assert/src/index.ts
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+++ b/packages/assert/src/index.ts
@@ -0,0 +1,84 @@
+import BigNumber from 'bignumber.js';
+import * as ethereum_address from 'ethereum-address';
+import * as _ from 'lodash';
+import * as validUrl from 'valid-url';
+
+import {SchemaValidator, Schema} from '0x-json-schemas';
+
+const HEX_REGEX = /^0x[0-9A-F]*$/i;
+
+export const assert = {
+ isBigNumber(variableName: string, value: BigNumber): void {
+ const isBigNumber = _.isObject(value) && (value as any).isBigNumber;
+ this.assert(isBigNumber, this.typeAssertionMessage(variableName, 'BigNumber', value));
+ },
+ isUndefined(value: any, variableName?: string): void {
+ this.assert(_.isUndefined(value), this.typeAssertionMessage(variableName, 'undefined', value));
+ },
+ isString(variableName: string, value: string): void {
+ this.assert(_.isString(value), this.typeAssertionMessage(variableName, 'string', value));
+ },
+ isFunction(variableName: string, value: any): void {
+ this.assert(_.isFunction(value), this.typeAssertionMessage(variableName, 'function', value));
+ },
+ isHexString(variableName: string, value: string): void {
+ this.assert(_.isString(value) && HEX_REGEX.test(value),
+ this.typeAssertionMessage(variableName, 'HexString', value));
+ },
+ isETHAddressHex(variableName: string, value: string): void {
+ this.assert(ethereum_address.isAddress(value), this.typeAssertionMessage(variableName, 'ETHAddressHex', value));
+ this.assert(
+ ethereum_address.isAddress(value) && value.toLowerCase() === value,
+ `Checksummed addresses are not supported. Convert ${variableName} to lower case before passing`,
+ );
+ },
+ doesBelongToStringEnum(variableName: string, value: string,
+ stringEnum: any /* There is no base type for every string enum */): void {
+ const doesBelongToStringEnum = !_.isUndefined(stringEnum[value]);
+ const enumValues = _.keys(stringEnum);
+ const enumValuesAsStrings = _.map(enumValues, enumValue => `'${enumValue}'`);
+ const enumValuesAsString = enumValuesAsStrings.join(', ');
+ assert.assert(
+ doesBelongToStringEnum,
+ `Expected ${variableName} to be one of: ${enumValuesAsString}, encountered: ${value}`,
+ );
+ },
+ hasAtMostOneUniqueValue(value: any[], errMsg: string): void {
+ this.assert(_.uniq(value).length <= 1, errMsg);
+ },
+ isNumber(variableName: string, value: number): void {
+ this.assert(_.isFinite(value), this.typeAssertionMessage(variableName, 'number', value));
+ },
+ isBoolean(variableName: string, value: boolean): void {
+ this.assert(_.isBoolean(value), this.typeAssertionMessage(variableName, 'boolean', value));
+ },
+ isWeb3Provider(variableName: string, value: any): void {
+ const isWeb3Provider = _.isFunction((value as any).send) || _.isFunction((value as any).sendAsync);
+ this.assert(isWeb3Provider, this.typeAssertionMessage(variableName, 'Web3.Provider', value));
+ },
+ doesConformToSchema(variableName: string, value: any, schema: Schema): void {
+ const schemaValidator = new SchemaValidator();
+ const validationResult = schemaValidator.validate(value, schema);
+ const hasValidationErrors = validationResult.errors.length > 0;
+ const msg = `Expected ${variableName} to conform to schema ${schema.id}
+Encountered: ${JSON.stringify(value, null, '\t')}
+Validation errors: ${validationResult.errors.join(', ')}`;
+ this.assert(!hasValidationErrors, msg);
+ },
+ isHttpUrl(variableName: string, value: any): void {
+ const isValidUrl = validUrl.isWebUri(value);
+ this.assert(isValidUrl, this.typeAssertionMessage(variableName, 'http url', value));
+ },
+ isUri(variableName: string, value: any): void {
+ const isValidUri = validUrl.isUri(value);
+ this.assert(isValidUri, this.typeAssertionMessage(variableName, 'uri', value));
+ },
+ assert(condition: boolean, message: string): void {
+ if (!condition) {
+ throw new Error(message);
+ }
+ },
+ typeAssertionMessage(variableName: string, type: string, value: any): string {
+ return `Expected ${variableName} to be of type ${type}, encountered: ${value}`;
+ },
+};