@peculiar/asn1-schema
Version:
Decorators for ASN.1 schemas building
140 lines (139 loc) • 6.93 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.AsnParser = void 0;
const asn1js = require("asn1js");
const enums_1 = require("./enums");
const converters = require("./converters");
const errors_1 = require("./errors");
const helper_1 = require("./helper");
const storage_1 = require("./storage");
class AsnParser {
static parse(data, target) {
const asn1Parsed = asn1js.fromBER(data);
if (asn1Parsed.result.error) {
throw new Error(asn1Parsed.result.error);
}
const res = this.fromASN(asn1Parsed.result, target);
return res;
}
static fromASN(asn1Schema, target) {
var _a;
try {
if ((0, helper_1.isConvertible)(target)) {
const value = new target();
return value.fromASN(asn1Schema);
}
const schema = storage_1.schemaStorage.get(target);
storage_1.schemaStorage.cache(target);
let targetSchema = schema.schema;
if (asn1Schema.constructor === asn1js.Constructed && schema.type !== enums_1.AsnTypeTypes.Choice) {
targetSchema = new asn1js.Constructed({
idBlock: {
tagClass: 3,
tagNumber: asn1Schema.idBlock.tagNumber,
},
value: schema.schema.valueBlock.value,
});
for (const key in schema.items) {
delete asn1Schema[key];
}
}
const asn1ComparedSchema = asn1js.compareSchema({}, asn1Schema, targetSchema);
if (!asn1ComparedSchema.verified) {
throw new errors_1.AsnSchemaValidationError(`Data does not match to ${target.name} ASN1 schema. ${asn1ComparedSchema.result.error}`);
}
const res = new target();
if ((0, helper_1.isTypeOfArray)(target)) {
if (!("value" in asn1Schema.valueBlock && Array.isArray(asn1Schema.valueBlock.value))) {
throw new Error(`Cannot get items from the ASN.1 parsed value. ASN.1 object is not constructed.`);
}
const itemType = schema.itemType;
if (typeof itemType === "number") {
const converter = converters.defaultConverter(itemType);
if (!converter) {
throw new Error(`Cannot get default converter for array item of ${target.name} ASN1 schema`);
}
return target.from(asn1Schema.valueBlock.value, (element) => converter.fromASN(element));
}
else {
return target.from(asn1Schema.valueBlock.value, (element) => this.fromASN(element, itemType));
}
}
for (const key in schema.items) {
const asn1SchemaValue = asn1ComparedSchema.result[key];
if (!asn1SchemaValue) {
continue;
}
const schemaItem = schema.items[key];
const schemaItemType = schemaItem.type;
if (typeof schemaItemType === "number" || (0, helper_1.isConvertible)(schemaItemType)) {
const converter = (_a = schemaItem.converter) !== null && _a !== void 0 ? _a : ((0, helper_1.isConvertible)(schemaItemType)
? new schemaItemType()
: null);
if (!converter) {
throw new Error("Converter is empty");
}
if (schemaItem.repeated) {
if (schemaItem.implicit) {
const Container = schemaItem.repeated === "sequence" ? asn1js.Sequence : asn1js.Set;
const newItem = new Container();
newItem.valueBlock = asn1SchemaValue.valueBlock;
const newItemAsn = asn1js.fromBER(newItem.toBER(false));
if (newItemAsn.offset === -1) {
throw new Error(`Cannot parse the child item. ${newItemAsn.result.error}`);
}
if (!("value" in newItemAsn.result.valueBlock &&
Array.isArray(newItemAsn.result.valueBlock.value))) {
throw new Error("Cannot get items from the ASN.1 parsed value. ASN.1 object is not constructed.");
}
const value = newItemAsn.result.valueBlock.value;
res[key] = Array.from(value, (element) => converter.fromASN(element));
}
else {
res[key] = Array.from(asn1SchemaValue, (element) => converter.fromASN(element));
}
}
else {
let value = asn1SchemaValue;
if (schemaItem.implicit) {
let newItem;
if ((0, helper_1.isConvertible)(schemaItemType)) {
newItem = new schemaItemType().toSchema("");
}
else {
const Asn1TypeName = enums_1.AsnPropTypes[schemaItemType];
const Asn1Type = asn1js[Asn1TypeName];
if (!Asn1Type) {
throw new Error(`Cannot get '${Asn1TypeName}' class from asn1js module`);
}
newItem = new Asn1Type();
}
newItem.valueBlock = value.valueBlock;
value = asn1js.fromBER(newItem.toBER(false)).result;
}
res[key] = converter.fromASN(value);
}
}
else {
if (schemaItem.repeated) {
if (!Array.isArray(asn1SchemaValue)) {
throw new Error("Cannot get list of items from the ASN.1 parsed value. ASN.1 value should be iterable.");
}
res[key] = Array.from(asn1SchemaValue, (element) => this.fromASN(element, schemaItemType));
}
else {
res[key] = this.fromASN(asn1SchemaValue, schemaItemType);
}
}
}
return res;
}
catch (error) {
if (error instanceof errors_1.AsnSchemaValidationError) {
error.schemas.push(target.name);
}
throw error;
}
}
}
exports.AsnParser = AsnParser;