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-rw-r--r--app/utils/validate.ts77
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diff --git a/app/utils/validate.ts b/app/utils/validate.ts
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+const ValidateJS = require("validate.js")
+
+// HACK(steve): wierd typescript situation because of strange typings
+const Validate: any = ValidateJS.default ? ValidateJS.default : ValidateJS
+
+/**
+ * Validates that 1 attribute doesn't appear in another's attributes content.
+ */
+Validate.validators.excludes = function custom(value, options, key, attributes) {
+ const list = attributes[options.attribute] || []
+ if (value && list.includes(value)) {
+ return options.message || `${value} is in the list`
+ }
+}
+
+/**
+ * Validates that another attribute isn't true.
+ */
+Validate.validators.tripped = function custom(value, options, key, attributes) {
+ if (value && attributes[options.attribute] === true) {
+ return options.message || `${options.attribute} is true`
+ }
+}
+
+/**
+ * Defines the rules for validating.
+ *
+ * Example:
+ * ```ts
+ * const RULES = {
+ * favoriteBand: {
+ * inclusion: { ['Weezer', 'Other'], message: 'Pick wisely.' }
+ * },
+ * name: {
+ * presence: { message: 'A developer has no name?' }
+ * }
+ * }
+ * validate(RULES, {})
+ * ```
+ *
+ * See https://validatejs.org/#validators for more examples.
+ *
+ */
+export interface ValidationRules {
+ [key: string]: Record<string, unknown>
+}
+
+/**
+ * An object containing any errors found.
+ *
+ * Example:
+ * ```js
+ * {
+ * email: ['Invalid email address.'],
+ * password: [
+ * 'Password must be 6 characters.',
+ * 'Password must have at least 1 digit.'
+ * ]
+ * }
+ * ```
+ */
+export interface ValidationErrors {
+ [key: string]: string[]
+}
+
+/**
+ * Runs the given rules against the data object.
+ *
+ * @param rules The rules to apply.
+ * @param data The object to validate.
+ */
+export function validate(rules: ValidationRules, data: Record<string, unknown>): ValidationErrors {
+ if (typeof data !== "object") {
+ return {} as ValidationErrors
+ }
+ return Validate(data, rules, { fullMessages: false }) || {}
+}