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• .. (вверх)
• [DIR] ..
• [FILE] convert.js
• [FILE] converters.js
• [FILE] decorators.js
• [FILE] enums.js
• [DIR] errors
• [FILE] helper.js
• [FILE] index.js
• [FILE] objects.js
• [FILE] parser.js
• [FILE] schema.js
• [FILE] serializer.js
• [FILE] storage.js
• [DIR] types
• [FILE] types.js

Просмотр файла: schema.js

import * as asn1js from "asn1js";
import { AsnPropTypes, AsnTypeTypes } from "./enums";
import { isConvertible } from "./helper";
export class AsnSchemaStorage {
    constructor() {
        this.items = new WeakMap();
    }
    has(target) {
        return this.items.has(target);
    }
    get(target, checkSchema = false) {
        const schema = this.items.get(target);
        if (!schema) {
            throw new Error(`Cannot get schema for '${target.prototype.constructor.name}' target`);
        }
        if (checkSchema && !schema.schema) {
            throw new Error(`Schema '${target.prototype.constructor.name}' doesn't contain ASN.1 schema. Call 'AsnSchemaStorage.cache'.`);
        }
        return schema;
    }
    cache(target) {
        const schema = this.get(target);
        if (!schema.schema) {
            schema.schema = this.create(target, true);
        }
    }
    createDefault(target) {
        const schema = { type: AsnTypeTypes.Sequence, items: {} };
        const parentSchema = this.findParentSchema(target);
        if (parentSchema) {
            Object.assign(schema, parentSchema);
            schema.items = Object.assign({}, schema.items, parentSchema.items);
        }
        return schema;
    }
    create(target, useNames) {
        const schema = this.items.get(target) || this.createDefault(target);
        const asn1Value = [];
        for (const key in schema.items) {
            const item = schema.items[key];
            const name = useNames ? key : "";
            let asn1Item;
            if (typeof item.type === "number") {
                const Asn1TypeName = AsnPropTypes[item.type];
                const Asn1Type = asn1js[Asn1TypeName];
                if (!Asn1Type) {
                    throw new Error(`Cannot get ASN1 class by name '${Asn1TypeName}'`);
                }
                asn1Item = new Asn1Type({ name });
            }
            else if (isConvertible(item.type)) {
                const instance = new item.type();
                asn1Item = instance.toSchema(name);
            }
            else if (item.optional) {
                const itemSchema = this.get(item.type);
                if (itemSchema.type === AsnTypeTypes.Choice) {
                    asn1Item = new asn1js.Any({ name });
                }
                else {
                    asn1Item = this.create(item.type, false);
                    asn1Item.name = name;
                }
            }
            else {
                asn1Item = new asn1js.Any({ name });
            }
            const optional = !!item.optional || item.defaultValue !== undefined;
            if (item.repeated) {
                asn1Item.name = "";
                const Container = item.repeated === "set" ? asn1js.Set : asn1js.Sequence;
                asn1Item = new Container({
                    name: "",
                    value: [new asn1js.Repeated({ name, value: asn1Item })],
                });
            }
            if (item.context !== null && item.context !== undefined) {
                if (item.implicit) {
                    if (typeof item.type === "number" || isConvertible(item.type)) {
                        const Container = item.repeated ? asn1js.Constructed : asn1js.Primitive;
                        asn1Value.push(new Container({ name, optional, idBlock: { tagClass: 3, tagNumber: item.context } }));
                    }
                    else {
                        this.cache(item.type);
                        const isRepeated = !!item.repeated;
                        let value = !isRepeated ? this.get(item.type, true).schema : asn1Item;
                        value =
                            "valueBlock" in value
                                ? value.valueBlock.value
                                :
                                    value.value;
                        asn1Value.push(new asn1js.Constructed({
                            name: !isRepeated ? name : "",
                            optional,
                            idBlock: { tagClass: 3, tagNumber: item.context },
                            value: value,
                        }));
                    }
                }
                else {
                    asn1Value.push(new asn1js.Constructed({
                        optional,
                        idBlock: { tagClass: 3, tagNumber: item.context },
                        value: [asn1Item],
                    }));
                }
            }
            else {
                asn1Item.optional = optional;
                asn1Value.push(asn1Item);
            }
        }
        switch (schema.type) {
            case AsnTypeTypes.Sequence:
                return new asn1js.Sequence({ value: asn1Value, name: "" });
            case AsnTypeTypes.Set:
                return new asn1js.Set({ value: asn1Value, name: "" });
            case AsnTypeTypes.Choice:
                return new asn1js.Choice({ value: asn1Value, name: "" });
            default:
                throw new Error(`Unsupported ASN1 type in use`);
        }
    }
    set(target, schema) {
        this.items.set(target, schema);
        return this;
    }
    findParentSchema(target) {
        const parent = Object.getPrototypeOf(target);
        if (parent) {
            const schema = this.items.get(parent);
            return schema || this.findParentSchema(parent);
        }
        return null;
    }
}

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