1 files changed, 170 insertions, 0 deletions
diff --git a/third_party/js/PKI.js/src/Attribute.ts b/third_party/js/PKI.js/src/Attribute.ts
new file mode 100644
index 0000000000..81de5655e1
--- /dev/null
+++ b/third_party/js/PKI.js/src/Attribute.ts
@@ -0,0 +1,170 @@
+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 TYPE = "type";
+const VALUES = "values";
+const CLEAR_PROPS = [
+  TYPE,
+  VALUES
+];
+
+export interface IAttribute {
+  /**
+   * Specifies type of attribute value
+   */
+  type: string;
+  /**
+   * List of attribute values
+   */
+  values: any[];
+}
+
+export type AttributeParameters = PkiObjectParameters & Partial<IAttribute>;
+
+export type AttributeSchema = Schema.SchemaParameters<{
+  setName?: string;
+  type?: string;
+  values?: string;
+}>;
+
+export interface AttributeJson {
+  type: string;
+  values: any[];
+}
+
+/**
+ * Represents the Attribute structure described in [RFC2986](https://datatracker.ietf.org/doc/html/rfc2986)
+ */
+export class Attribute extends PkiObject implements IAttribute {
+
+  public static override CLASS_NAME = "Attribute";
+
+  public type!: string;
+  public values!: any[];
+
+  /**
+   * Initializes a new instance of the {@link Attribute} class
+   * @param parameters Initialization parameters
+   */
+  constructor(parameters: AttributeParameters = {}) {
+    super();
+
+    this.type = pvutils.getParametersValue(parameters, TYPE, Attribute.defaultValues(TYPE));
+    this.values = pvutils.getParametersValue(parameters, VALUES, Attribute.defaultValues(VALUES));
+
+    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 TYPE): string;
+  public static override defaultValues(memberName: typeof VALUES): any[];
+  public static override defaultValues(memberName: string): any {
+    switch (memberName) {
+      case TYPE:
+        return EMPTY_STRING;
+      case VALUES:
+        return [];
+      default:
+        return super.defaultValues(memberName);
+    }
+  }
+
+  /**
+   * Compares values with default values for all class members
+   * @param memberName String name for a class member
+   * @param memberValue Value to compare with default value
+   */
+  public static compareWithDefault(memberName: string, memberValue: any): boolean {
+    switch (memberName) {
+      case TYPE:
+        return (memberValue === EMPTY_STRING);
+      case VALUES:
+        return (memberValue.length === 0);
+      default:
+        return super.defaultValues(memberName);
+    }
+  }
+
+  /**
+   * @inheritdoc
+   * @asn ASN.1 schema
+   * ```asn
+   * Attribute { ATTRIBUTE:IOSet } ::= SEQUENCE {
+   *    type   ATTRIBUTE.&id({IOSet}),
+   *    values SET SIZE(1..MAX) OF ATTRIBUTE.&Type({IOSet}{@type})
+   * }
+   *```
+   */
+  public static override schema(parameters: AttributeSchema = {}) {
+    const names = pvutils.getParametersValue<NonNullable<typeof parameters.names>>(parameters, "names", {});
+
+    return (new asn1js.Sequence({
+      name: (names.blockName || EMPTY_STRING),
+      value: [
+        new asn1js.ObjectIdentifier({ name: (names.type || EMPTY_STRING) }),
+        new asn1js.Set({
+          name: (names.setName || EMPTY_STRING),
+          value: [
+            new asn1js.Repeated({
+              name: (names.values || EMPTY_STRING),
+              value: new asn1js.Any()
+            })
+          ]
+        })
+      ]
+    }));
+  }
+
+  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,
+      Attribute.schema({
+        names: {
+          type: TYPE,
+          values: VALUES
+        }
+      })
+    );
+    AsnError.assertSchema(asn1, this.className);
+
+    // Get internal properties from parsed schema
+    this.type = asn1.result.type.valueBlock.toString();
+    this.values = asn1.result.values;
+  }
+
+  public toSchema(): asn1js.Sequence {
+    //#region Construct and return new ASN.1 schema for this object
+    return (new asn1js.Sequence({
+      value: [
+        new asn1js.ObjectIdentifier({ value: this.type }),
+        new asn1js.Set({
+          value: this.values
+        })
+      ]
+    }));
+    //#endregion
+  }
+
+  public toJSON(): AttributeJson {
+    return {
+      type: this.type,
+      values: Array.from(this.values, o => o.toJSON())
+    };
+  }
+
+}
+