1 files changed, 129 insertions, 0 deletions
diff --git a/third_party/js/PKI.js/src/Extensions.ts b/third_party/js/PKI.js/src/Extensions.ts
new file mode 100644
index 0000000000..d5624332cb
--- /dev/null
+++ b/third_party/js/PKI.js/src/Extensions.ts
@@ -0,0 +1,129 @@
+import * as asn1js from "asn1js";
+import * as pvutils from "pvutils";
+import { EMPTY_STRING } from "./constants";
+import { AsnError } from "./errors";
+import { Extension, ExtensionJson, ExtensionSchema } from "./Extension";
+import { PkiObject, PkiObjectParameters } from "./PkiObject";
+import * as Schema from "./Schema";
+
+const EXTENSIONS = "extensions";
+const CLEAR_PROPS = [
+  EXTENSIONS,
+];
+
+export interface IExtensions {
+  /**
+   * List of extensions
+   */
+  extensions: Extension[];
+}
+
+export type ExtensionsParameters = PkiObjectParameters & Partial<IExtensions>;
+
+export type ExtensionsSchema = Schema.SchemaParameters<{
+  extensions?: string;
+  extension?: ExtensionSchema;
+}>;
+
+export interface ExtensionsJson {
+  extensions: ExtensionJson[];
+}
+
+/**
+ * Represents the Extensions structure described in [RFC5280](https://datatracker.ietf.org/doc/html/rfc5280)
+ */
+export class Extensions extends PkiObject implements IExtensions {
+
+  public static override CLASS_NAME = "Extensions";
+
+  public extensions!: Extension[];
+
+  /**
+   * Initializes a new instance of the {@link Extensions} class
+   * @param parameters Initialization parameters
+   */
+  constructor(parameters: ExtensionsParameters = {}) {
+    super();
+
+    this.extensions = pvutils.getParametersValue(parameters, EXTENSIONS, Extensions.defaultValues(EXTENSIONS));
+
+    if (parameters.schema) {
+      this.fromSchema(parameters.schema);
+    }
+  }
+
+  /**
+   * Returns default values for all class members
+   * @param memberName String name for a class member
+   * @returns Default value
+   */
+  public static override defaultValues(memberName: typeof EXTENSIONS): Extension[];
+  public static override defaultValues(memberName: string): any {
+    switch (memberName) {
+      case EXTENSIONS:
+        return [];
+      default:
+        return super.defaultValues(memberName);
+    }
+  }
+
+  /**
+   * @inheritdoc
+   * @asn ASN.1 schema
+   * ```asn
+   * Extensions ::= SEQUENCE SIZE (1..MAX) OF Extension
+   * ```
+   *
+   * @param parameters Input parameters for the schema
+   * @param optional Flag that current schema should be optional
+   * @returns ASN.1 schema object
+   */
+  public static override schema(parameters: ExtensionsSchema = {}, optional = false) {
+    const names = pvutils.getParametersValue<NonNullable<typeof parameters.names>>(parameters, "names", {});
+
+    return (new asn1js.Sequence({
+      optional,
+      name: (names.blockName || EMPTY_STRING),
+      value: [
+        new asn1js.Repeated({
+          name: (names.extensions || EMPTY_STRING),
+          value: Extension.schema(names.extension || {})
+        })
+      ]
+    }));
+  }
+
+  public fromSchema(schema: Schema.SchemaType): void {
+    // Clear input data first
+    pvutils.clearProps(schema, CLEAR_PROPS);
+
+    // Check the schema is valid
+    const asn1 = asn1js.compareSchema(schema,
+      schema,
+      Extensions.schema({
+        names: {
+          extensions: EXTENSIONS
+        }
+      })
+    );
+    AsnError.assertSchema(asn1, this.className);
+
+    // Get internal properties from parsed schema
+    this.extensions = Array.from(asn1.result.extensions, element => new Extension({ schema: element }));
+  }
+
+  public toSchema(): asn1js.Sequence {
+    //#region Construct and return new ASN.1 schema for this object
+    return (new asn1js.Sequence({
+      value: Array.from(this.extensions, o => o.toSchema())
+    }));
+    //#endregion
+  }
+
+  public toJSON(): ExtensionsJson {
+    return {
+      extensions: this.extensions.map(o => o.toJSON())
+    };
+  }
+
+}