1 files changed, 47 insertions, 2 deletions
diff --git a/packages/taler-util/src/codec.ts b/packages/taler-util/src/codec.ts
index 701fc8835..54d450d82 100644
--- a/packages/taler-util/src/codec.ts
+++ b/packages/taler-util/src/codec.ts
@@ -361,6 +361,40 @@ export function codecForStringURL(shouldEndWithSlash?: boolean): Codec<string> {
 }
 
 /**
+ * Return a codec for a value that must be a string.
+ */
+export function codecForURL(shouldEndWithSlash?: boolean): Codec<URL> {
+  return {
+    decode(x: any, c?: Context): URL {
+      if (typeof x !== "string") {
+        throw new DecodingError(
+          `expected string at ${renderContext(c)} but got ${typeof x}`,
+        );
+      }
+      if (shouldEndWithSlash && !x.endsWith("/")) {
+        throw new DecodingError(
+          `expected URL string that ends with slash at ${renderContext(
+            c,
+          )} but got ${x}`,
+        );
+      }
+      try {
+        const url = new URL(x);
+        return url;
+      } catch (e) {
+        if (e instanceof Error) {
+          throw new DecodingError(e.message);
+        } else {
+          throw new DecodingError(
+            `expected an URL string at ${renderContext(c)} but got "${x}"`,
+          );
+        }
+      }
+    },
+  };
+}
+
+/**
  * Codec that allows any value.
  */
 export function codecForAny(): Codec<any> {
@@ -457,6 +491,19 @@ export function codecOptional<V>(innerCodec: Codec<V>): Codec<V | undefined> {
   };
 }
 
+export function codecForLazy<V>(innerCodec: () => Codec<V>): Codec<V> {
+  let instance: Codec<V> | undefined = undefined
+  return {
+    decode(x: any, c?: Context): V {
+      if (instance === undefined) {
+        instance = innerCodec()
+      }
+      return instance.decode(x, c);
+    },
+  };
+}
+
+
 export type CodecType<T> = T extends Codec<infer X> ? X : any;
 
 export function codecForEither<T extends Array<Codec<unknown>>>(
@@ -480,5 +527,3 @@ export function codecForEither<T extends Array<Codec<unknown>>>(
     },
   };
 }
-
-const x = codecForEither(codecForString(), codecForNumber());