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import { inject, Injectable } from '@angular/core';
import { Router } from '@angular/router';
import {
ApolloLink,
ApolloQueryResult,
FetchResult,
Operation,
ServerError,
ServerParseError,
split,
UriFunction,
} from '@apollo/client/core';
import { ErrorResponse, onError } from '@apollo/client/link/error';
import { getMainDefinition } from '@apollo/client/utilities';
import { HTTP_STATUS, WEB_CLIENT_APP_ENV } from '@app/client-util';
import { Store } from '@ngrx/store';
import { MutationResult } from 'apollo-angular';
import { HttpLink, HttpLinkHandler } from 'apollo-angular/http';
import createUploadLink from 'apollo-upload-client/createUploadLink.mjs';
import memo from 'memo-decorator';
import { MonoTypeOperatorFunction, Observable, of } from 'rxjs';
import { catchError, finalize, map, tap, timeout } from 'rxjs/operators';
import { httpProgressAction } from '../../http-progress.actions';
import { IHttpProgressState } from '../../http-progress.interface';
import { AppToasterService } from '../toaster/toaster.service';
export type TGqlClient = 'graphql';
/**
* Handlers to work with http requests.
*/
@Injectable({
providedIn: 'root',
})
export class AppHttpHandlersService {
private readonly store = inject(Store<IHttpProgressState>);
private readonly toaster = inject(AppToasterService);
private readonly httpLink = inject(HttpLink);
private readonly router = inject(Router);
private readonly env = inject(WEB_CLIENT_APP_ENV);
public readonly defaultHttpTimeout = 10000;
/**
* Gets gql http headers.
* @param userToken user token
* @returns the gql headers observable
*/
public getGraphQLHttpHeaders(userToken: string) {
return new HttpHeaders({
Authorization: `Token ${userToken}`,
});
}
/**
* Returns API base url concatenated with provided endpoint path.
* Adds preceding slash before endpoint path if it is missing.
* @param path endpoint path
* @returns an endpoint url
*/
@memo()
public getEndpoint(path: string): string {
const endpoint = /^\/.*$/.test(path) ? path : `/${path}`;
return `${this.env.api}${endpoint}`;
}
/**
* Pipes an http response.
* Attaches settings:
* - timeout
* - error handler
* - progress indicator
* @param observable input observable
* @returns a piped observable
*/
public pipeHttpResponse<T>(observable: Observable<T>) {
this.store.dispatch(httpProgressAction.start({ payload: { mainView: true } }));
return observable.pipe(
timeout(this.defaultHttpTimeout),
this.tapError<T>(),
catchError(err => this.handleError(err)),
finalize(() => {
this.store.dispatch(httpProgressAction.stop({ payload: { mainView: true } }));
}),
);
}
/**
* Pipes a gql response.
* Attaches settings:
* - timeout
* - error handler
* - progress indicator
* @param observable input observable
* @returns a piped observable
*/
public pipeGqlResponse<T>(observable: Observable<ApolloQueryResult<T> | FetchResult<T> | MutationResult<T>>) {
this.store.dispatch(httpProgressAction.start({ payload: { mainView: true } }));
return observable.pipe(
timeout(this.defaultHttpTimeout),
this.tapError(),
map(result => ('data' in result ? result.data : result)),
catchError(err => this.handleGqlError(err)),
finalize(() => {
this.store.dispatch(httpProgressAction.stop({ payload: { mainView: true } }));
}),
);
}
/**
* Gets the gql network link.
* @param hander http link handler
* @param uri universal resource indentifier
* @param userToken user token
* @returns gql link
*/
private createGqlNetworkLink(splitTest: (op: Operation) => boolean, hander: HttpLinkHandler, uri: string, userToken: string) {
return split(
splitTest,
hander,
createUploadLink({
uri,
headers: { Authorization: `Token ${userToken}` },
}) as unknown as ApolloLink,
);
}
/**
* Gql link split test function.
*/
public gqlLinkSplitTest() {
const uploadMutations = ['UploadFile'];
return (operation: Operation) => {
const { name } = getMainDefinition(operation.query);
return typeof name === 'undefined' || !uploadMutations.includes(name.value);
};
}
/**
* Gets the gql error link handler.
* @returns apollo error link handler
*/
public gqlErrorLinkHandler(error: ErrorResponse) {
const { graphQLErrors, networkError } = error;
let errorMessage = '';
graphQLErrors?.map(({ message, extensions }) => {
console.error('Apollo linkHandler [GraphQL error]: ', message);
const code = extensions?.['code'] as string;
const result = `[GraphQL error ${code}]: ${message}`;
errorMessage += result;
});
if (typeof networkError !== 'undefined') {
console.error('Apollo linkHandler [Network error]: ', networkError);
Iif (networkError instanceof HttpErrorResponse) {
errorMessage += (networkError.error as { detail: string }).detail;
} else {
const code = (networkError as (ServerParseError & ServerError) | null)?.statusCode;
const result = `[Network error ${code}]: ${networkError?.message}`;
errorMessage += result;
}
}
errorMessage = errorMessage.length === 0 ? 'Graphql request error' : errorMessage;
this.toaster.showToaster(errorMessage, 'error');
}
/**
* Creates the gql link with an error handler.
* @param userToken user token
* @param name the client name
* @returns apollo link observable
*/
public createGqlLink(userToken: string, name: TGqlClient = 'graphql'): ApolloLink {
const uri = this.getEndpoint(name);
const uriFn = this.gqlUriFunction(uri);
const httpLinkHandler = this.httpLink.create({
uri: uriFn,
});
const linkHandler: ApolloLink = onError((error: ErrorResponse) => this.gqlErrorLinkHandler(error));
const splitTest = this.gqlLinkSplitTest();
const networkLink = this.createGqlNetworkLink(splitTest, httpLinkHandler, uri, userToken);
return linkHandler.concat(networkLink);
}
/**
* Gql URI function.
* @param uri graphql endpoint
*/
public gqlUriFunction(uri: string): UriFunction {
return (operation: Operation) => {
return `${uri}?operation=${operation.operationName}`;
};
}
/**
* Check error status, and reset token if status is 401.
* @param status error status
*/
public checkErrorStatusAndRedirect(status: HTTP_STATUS): void {
if (status === HTTP_STATUS.UNAUTHORIZED) {
const message = 'Something went wrong during authorization or you are not authorized to see this content.';
this.toaster.showToaster(message, 'error');
void this.router.navigate([{ outlets: { primary: [''] } }]);
}
}
/**
* Gets an error message from an http error response.
* @param error http error response
* @returns an error message
*/
public getErrorMessage(error: HttpErrorResponse): string {
const message: string | undefined = error.message ? error.message : error.error;
const result: string =
typeof message !== 'undefined' ? message : error.status ? `${error.status} - ${error.statusText}` : 'Server error';
return result;
}
/**
* Handles error.
* @param error error object
* @returns an empty observable
*/
public handleError(error: HttpErrorResponse): Observable<never> {
const message = this.getErrorMessage(error);
this.toaster.showToaster(message, 'error');
return of();
}
/**
* Handles a graphQL error.
* @param error error message
* @returns an empty observable
*/
public handleGqlError(error: string): Observable<never> {
this.toaster.showToaster(error, 'error');
return of();
}
/**
* Taps errors.
* @returns a monotype operator function
*/
public tapError<T>(): MonoTypeOperatorFunction<T> {
return tap({
next: (): void => void 0,
error: (error: HttpErrorResponse) => {
this.checkErrorStatusAndRedirect(error.status);
},
});
}
}
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