Refactor:

- Files have been categorised for clarity. The deliverables are not affected.

src/common/ObsHttpHandler.ts

@@ -0,0 +1,133 @@
+// This file is based on a file that was published by the @remotely-save, under the Apache 2 License.
+// I would love to express my deepest gratitude to the original authors for their hard work and dedication. Without their contributions, this project would not have been possible.
+// 
+// Original Implementation is here: https://github.com/remotely-save/remotely-save/blob/28b99557a864ef59c19d2ad96101196e401718f0/src/remoteForS3.ts
+
+import {
+    FetchHttpHandler,
+    type FetchHttpHandlerOptions,
+} from "@smithy/fetch-http-handler";
+import { HttpRequest, HttpResponse, type HttpHandlerOptions } from "@smithy/protocol-http";
+//@ts-ignore
+import { requestTimeout } from "@smithy/fetch-http-handler/dist-es/request-timeout";
+import { buildQueryString } from "@smithy/querystring-builder";
+import { requestUrl, type RequestUrlParam } from "../deps.ts";
+////////////////////////////////////////////////////////////////////////////////
+// special handler using Obsidian requestUrl
+////////////////////////////////////////////////////////////////////////////////
+
+/**
+ * This is close to origin implementation of FetchHttpHandler
+ * https://github.com/aws/aws-sdk-js-v3/blob/main/packages/fetch-http-handler/src/fetch-http-handler.ts
+ * that is released under Apache 2 License.
+ * But this uses Obsidian requestUrl instead.
+ */
+export class ObsHttpHandler extends FetchHttpHandler {
+    requestTimeoutInMs: number | undefined;
+    reverseProxyNoSignUrl: string | undefined;
+    constructor(
+        options?: FetchHttpHandlerOptions,
+        reverseProxyNoSignUrl?: string
+    ) {
+        super(options);
+        this.requestTimeoutInMs =
+            options === undefined ? undefined : options.requestTimeout;
+        this.reverseProxyNoSignUrl = reverseProxyNoSignUrl;
+    }
+    async handle(
+        request: HttpRequest,
+        { abortSignal }: HttpHandlerOptions = {}
+    ): Promise<{ response: HttpResponse }> {
+        if (abortSignal?.aborted) {
+            const abortError = new Error("Request aborted");
+            abortError.name = "AbortError";
+            return Promise.reject(abortError);
+        }
+
+        let path = request.path;
+        if (request.query) {
+            const queryString = buildQueryString(request.query);
+            if (queryString) {
+                path += `?${queryString}`;
+            }
+        }
+
+        const { port, method } = request;
+        let url = `${request.protocol}//${request.hostname}${port ? `:${port}` : ""
+            }${path}`;
+        if (
+            this.reverseProxyNoSignUrl !== undefined &&
+            this.reverseProxyNoSignUrl !== ""
+        ) {
+            const urlObj = new URL(url);
+            urlObj.host = this.reverseProxyNoSignUrl;
+            url = urlObj.href;
+        }
+        const body =
+            method === "GET" || method === "HEAD" ? undefined : request.body;
+
+        const transformedHeaders: Record<string, string> = {};
+        for (const key of Object.keys(request.headers)) {
+            const keyLower = key.toLowerCase();
+            if (keyLower === "host" || keyLower === "content-length") {
+                continue;
+            }
+            transformedHeaders[keyLower] = request.headers[key];
+        }
+
+        let contentType: string | undefined = undefined;
+        if (transformedHeaders["content-type"] !== undefined) {
+            contentType = transformedHeaders["content-type"];
+        }
+
+        let transformedBody: any = body;
+        if (ArrayBuffer.isView(body)) {
+            transformedBody = new Uint8Array(body.buffer).buffer;
+        }
+
+        const param: RequestUrlParam = {
+            body: transformedBody,
+            headers: transformedHeaders,
+            method: method,
+            url: url,
+            contentType: contentType,
+        };
+
+        const raceOfPromises = [
+            requestUrl(param).then((rsp) => {
+                const headers = rsp.headers;
+                const headersLower: Record<string, string> = {};
+                for (const key of Object.keys(headers)) {
+                    headersLower[key.toLowerCase()] = headers[key];
+                }
+                const stream = new ReadableStream<Uint8Array>({
+                    start(controller) {
+                        controller.enqueue(new Uint8Array(rsp.arrayBuffer));
+                        controller.close();
+                    },
+                });
+                return {
+                    response: new HttpResponse({
+                        headers: headersLower,
+                        statusCode: rsp.status,
+                        body: stream,
+                    }),
+                };
+            }),
+            requestTimeout(this.requestTimeoutInMs),
+        ];
+
+        if (abortSignal) {
+            raceOfPromises.push(
+                new Promise<never>((resolve, reject) => {
+                    abortSignal.onabort = () => {
+                        const abortError = new Error("Request aborted");
+                        abortError.name = "AbortError";
+                        reject(abortError);
+                    };
+                })
+            );
+        }
+        return Promise.race(raceOfPromises);
+    }
+}