Add support for running under a context path, ie. /bonob, replace BONOB_WEB_ADDRESS with BONOB_URL

src/url_builder.ts

@@ -0,0 +1,72 @@
+function isURL(url: string | URL): url is URL {
+  return (url as URL).href !== undefined;
+}
+
+function isURLSearchParams(
+  searchParams: Record<string, string> | URLSearchParams
+): searchParams is URLSearchParams {
+  return (searchParams as URLSearchParams).getAll !== undefined;
+}
+
+const stripTrailingSlash = (url: string) =>
+  url.endsWith("/") ? url.substring(0, url.length - 1) : url;
+
+export class URLBuilder {
+  private url: URL;
+
+  constructor(url: string | URL) {
+    this.url = isURL(url) ? url : new URL(url);
+  }
+
+  public append = (
+    bits: Partial<{
+      pathname: string | undefined;
+      searchParams: Record<string, string> | URLSearchParams;
+    }> = { pathname: undefined, searchParams: undefined }
+  ) => {
+    let result = new URLBuilder(this.url);
+    if (bits.pathname)
+      result = result.with({
+        pathname: stripTrailingSlash(this.url.pathname) + bits.pathname,
+      });
+    if (bits.searchParams) {
+      const newSearchParams = new URLSearchParams(this.url.searchParams);
+      (isURLSearchParams(bits.searchParams)
+        ? bits.searchParams
+        : new URLSearchParams(bits.searchParams)
+      ).forEach((v, k) => newSearchParams.append(k, v));
+      result = result.with({ searchParams: newSearchParams });
+    }
+    return result;
+  };
+
+  public with = (
+    bits: Partial<{
+      pathname: string | undefined;
+      searchParams: Record<string, string> | URLSearchParams;
+    }> = { pathname: undefined, searchParams: undefined }
+  ) => {
+    const result = new URL(this.url.href);
+    if (bits.pathname) result.pathname = bits.pathname;
+    if (bits.searchParams) {
+      const keysToDelete: string[] = [];
+      result.searchParams.forEach((_, k) => keysToDelete.push(k));
+      keysToDelete.forEach((k) => result.searchParams.delete(k));
+      (isURLSearchParams(bits.searchParams)
+        ? bits.searchParams
+        : new URLSearchParams(bits.searchParams)
+      ).forEach((v, k) => result.searchParams.append(k, v));
+    }
+    return new URLBuilder(result);
+  };
+
+  public href = () => this.url.href;
+  public pathname = () => this.url.pathname;
+  public searchParams = () => this.url.searchParams;
+  public path = () => this.url.pathname + this.url.search;
+  public toString = () => this.url.href;
+}
+
+export default function url(url: string | URL): URLBuilder {
+  return new URLBuilder(url);
+}