From b78d21a524f7a11ad29b4bd230f23825f80c3ed7 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Sun, 26 Jul 2020 15:02:55 +0800
Subject: Merge front end repo

---
 Timeline/ClientApp/src/app/http/common.ts | 140 ++++++++++++++++++++++++++++++
 1 file changed, 140 insertions(+)
 create mode 100644 Timeline/ClientApp/src/app/http/common.ts

(limited to 'Timeline/ClientApp/src/app/http/common.ts')

diff --git a/Timeline/ClientApp/src/app/http/common.ts b/Timeline/ClientApp/src/app/http/common.ts
new file mode 100644
index 00000000..8fb8eb69
--- /dev/null
+++ b/Timeline/ClientApp/src/app/http/common.ts
@@ -0,0 +1,140 @@
+import { AxiosError, AxiosResponse } from 'axios';
+
+export const apiBaseUrl = '/api';
+
+export function base64(blob: Blob): Promise<string> {
+  return new Promise<string>((resolve) => {
+    const reader = new FileReader();
+    reader.onload = function () {
+      resolve((reader.result as string).replace(/^data:.+;base64,/, ''));
+    };
+    reader.readAsDataURL(blob);
+  });
+}
+
+export function extractStatusCode(error: AxiosError): number | null {
+  if (error.isAxiosError) {
+    const code = error?.response?.status;
+    if (typeof code === 'number') {
+      return code;
+    }
+  }
+  return null;
+}
+
+export interface CommonErrorResponse {
+  code: number;
+  message: string;
+}
+
+export function extractErrorCode(
+  error: AxiosError<CommonErrorResponse>
+): number | null {
+  if (error.isAxiosError) {
+    const code = error.response?.data?.code;
+    if (typeof code === 'number') {
+      return code;
+    }
+  }
+  return null;
+}
+
+export class HttpNetworkError extends Error {
+  constructor(public innerError?: AxiosError) {
+    super();
+  }
+}
+
+export class NotModified {}
+
+export interface BlobWithEtag {
+  data: Blob;
+  etag: string;
+}
+
+export function extractResponseData<T>(res: AxiosResponse<T>): T {
+  return res.data;
+}
+
+export function catchIfStatusCodeIs<
+  TResult,
+  TErrorHandlerResult extends TResult | PromiseLike<TResult> | null | undefined
+>(
+  statusCode: number,
+  errorHandler: (error: AxiosError<CommonErrorResponse>) => TErrorHandlerResult
+): (error: AxiosError<CommonErrorResponse>) => TErrorHandlerResult {
+  return (error: AxiosError<CommonErrorResponse>) => {
+    if (extractStatusCode(error) == statusCode) {
+      return errorHandler(error);
+    } else {
+      throw error;
+    }
+  };
+}
+
+export function convertToIfStatusCodeIs<NewError>(
+  statusCode: number,
+  newErrorType: {
+    new (innerError: AxiosError): NewError;
+  }
+): (error: AxiosError<CommonErrorResponse>) => never {
+  return catchIfStatusCodeIs(statusCode, (error) => {
+    throw new newErrorType(error);
+  });
+}
+
+export function catchIfErrorCodeIs<
+  TResult,
+  TErrorHandlerResult extends TResult | PromiseLike<TResult> | null | undefined
+>(
+  errorCode: number,
+  errorHandler: (error: AxiosError<CommonErrorResponse>) => TErrorHandlerResult
+): (error: AxiosError<CommonErrorResponse>) => TErrorHandlerResult {
+  return (error: AxiosError<CommonErrorResponse>) => {
+    if (extractErrorCode(error) == errorCode) {
+      return errorHandler(error);
+    } else {
+      throw error;
+    }
+  };
+}
+export function convertToIfErrorCodeIs<NewError>(
+  errorCode: number,
+  newErrorType: {
+    new (innerError: AxiosError): NewError;
+  }
+): (error: AxiosError<CommonErrorResponse>) => never {
+  return catchIfErrorCodeIs(errorCode, (error) => {
+    throw new newErrorType(error);
+  });
+}
+
+export function convertToNetworkError(
+  error: AxiosError<CommonErrorResponse>
+): never {
+  if (error.isAxiosError && error.response == null) {
+    throw new HttpNetworkError(error);
+  } else {
+    throw error;
+  }
+}
+
+export function convertToBlobWithEtag(res: AxiosResponse<Blob>): BlobWithEtag {
+  return {
+    data: res.data,
+    etag: (res.headers as Record<'etag', string>)['etag'],
+  };
+}
+
+export function convertToBlobWithEtagOrNotModified(
+  res: AxiosResponse<Blob>
+): BlobWithEtag | NotModified {
+  if (res.status === 304) {
+    return new NotModified();
+  } else {
+    return {
+      data: res.data,
+      etag: (res.headers as Record<'etag', string>)['etag'],
+    };
+  }
+}
-- 
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