serverHelpers.go.tmpl

{{ define "serverHelpers" }}
{{- $types := .Types -}}
{{- $typeMap := .TypeMap }}

const JS_TYPES = [
    "bigint",
    "boolean",
    "function",
    "number",
    "object",
    "string",
    "symbol",
    "undefined"
]

{{ range $_, $type := $types }}
    const validate{{ $type.Name }} = (value: any) => {
        {{ range $_, $field := $type.Fields }}
            {{ if $field.Optional }}
                if ("{{template "fieldName" dict "Field" $field }}" in value && !validateType(value["{{template "fieldName" dict "Field" $field }}"], "{{template "jsType" dict "Type" (coalesce $field.Type $type.Type) "TypeMap" $typeMap}}")) {
                    return false
                }
            {{ else }}
                if (!("{{template "fieldName" dict "Field" $field }}" in value) || !validateType(value["{{template "fieldName" dict "Field" $field }}"], "{{template "jsType" dict "Type" (coalesce $field.Type $type.Type) "TypeMap" $typeMap}}")) {
                    return false
                }
            {{ end }}
        {{ end }}

        return true
    }
{{ end }}

const TYPE_VALIDATORS: { [type: string]: (value: any) => boolean } = {
    {{ range $_, $type := $types }}
        {{ $type.Name }}: validate{{ $type.Name }},
    {{ end }}
}

const validateType = (value: any, type: string) => {
    if (JS_TYPES.indexOf(type) > -1) {
        return typeof value === type;
    }

    const validator = TYPE_VALIDATORS[type];

    if (!validator) {
        return false;
    }

    return validator(value);
}

{{ end }}