1 files changed, 123 insertions, 0 deletions
diff --git a/third_party/js/PKI.js/src/ExtKeyUsage.ts b/third_party/js/PKI.js/src/ExtKeyUsage.ts
new file mode 100644
index 0000000000..0ba9c385e6
--- /dev/null
+++ b/third_party/js/PKI.js/src/ExtKeyUsage.ts
@@ -0,0 +1,123 @@
+import * as asn1js from "asn1js";
+import * as pvutils from "pvutils";
+import { EMPTY_STRING } from "./constants";
+import { AsnError } from "./errors";
+import { PkiObject, PkiObjectParameters } from "./PkiObject";
+import * as Schema from "./Schema";
+
+const KEY_PURPOSES = "keyPurposes";
+const CLEAR_PROPS = [
+  KEY_PURPOSES,
+];
+
+export interface IExtKeyUsage {
+  keyPurposes: string[];
+}
+
+export interface ExtKeyUsageJson {
+  keyPurposes: string[];
+}
+
+export type ExtKeyUsageParameters = PkiObjectParameters & Partial<IExtKeyUsage>;
+
+/**
+ * Represents the ExtKeyUsage structure described in [RFC5280](https://datatracker.ietf.org/doc/html/rfc5280)
+ */
+export class ExtKeyUsage extends PkiObject implements IExtKeyUsage {
+
+  public static override CLASS_NAME = "ExtKeyUsage";
+
+  public keyPurposes!: string[];
+
+  /**
+   * Initializes a new instance of the {@link ExtKeyUsage} class
+   * @param parameters Initialization parameters
+   */
+  constructor(parameters: ExtKeyUsageParameters = {}) {
+    super();
+
+    this.keyPurposes = pvutils.getParametersValue(parameters, KEY_PURPOSES, ExtKeyUsage.defaultValues(KEY_PURPOSES));
+
+    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 KEY_PURPOSES): string[];
+  public static override defaultValues(memberName: string): any {
+    switch (memberName) {
+      case KEY_PURPOSES:
+        return [];
+      default:
+        return super.defaultValues(memberName);
+    }
+  }
+
+  /**
+   * @inheritdoc
+   * @asn ASN.1 schema
+   * ```asn
+   * ExtKeyUsage ::= SEQUENCE SIZE (1..MAX) OF KeyPurposeId
+   *
+   * KeyPurposeId ::= OBJECT IDENTIFIER
+   *```
+   */
+  public static override schema(parameters: Schema.SchemaParameters<{
+    keyPurposes?: string;
+  }> = {}): Schema.SchemaType {
+    /**
+     * @type {Object}
+     * @property {string} [blockName]
+     * @property {string} [keyPurposes]
+     */
+    const names = pvutils.getParametersValue<NonNullable<typeof parameters.names>>(parameters, "names", {});
+
+    return (new asn1js.Sequence({
+      name: (names.blockName || EMPTY_STRING),
+      value: [
+        new asn1js.Repeated({
+          name: (names.keyPurposes || EMPTY_STRING),
+          value: new asn1js.ObjectIdentifier()
+        })
+      ]
+    }));
+  }
+
+  public fromSchema(schema: Schema.SchemaType): void {
+    pvutils.clearProps(schema, CLEAR_PROPS);
+
+    // Check the schema is valid
+    const asn1 = asn1js.compareSchema(schema,
+      schema,
+      ExtKeyUsage.schema({
+        names: {
+          keyPurposes: KEY_PURPOSES
+        }
+      })
+    );
+    AsnError.assertSchema(asn1, this.className);
+
+    // Get internal properties from parsed schema
+    this.keyPurposes = Array.from(asn1.result.keyPurposes, (element: asn1js.ObjectIdentifier) => element.valueBlock.toString());
+  }
+
+  public toSchema(): asn1js.Sequence {
+    // Construct and return new ASN.1 schema for this object
+    return (new asn1js.Sequence({
+      value: Array.from(this.keyPurposes, element => new asn1js.ObjectIdentifier({ value: element }))
+    }));
+  }
+
+  public toJSON(): ExtKeyUsageJson {
+    return {
+      keyPurposes: Array.from(this.keyPurposes)
+    };
+  }
+
+}
+