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the result of original `fetch` call.\n *\n * This mean, that whenever we use the Fetch API to send our own requests, _and_\n * some ad-blocker blocks it, this orphaned chain will _always_ reject,\n * effectively causing another event to be captured.\n * This makes a whole process become an infinite loop, which we need to somehow\n * deal with, and break it in one way or another.\n *\n * To deal with this issue, we are making sure that we _always_ use the real\n * browser Fetch API, instead of relying on what `window.fetch` exposes.\n * The only downside to this would be missing our own requests as breadcrumbs,\n * but because we are already not doing this, it should be just fine.\n *\n * Possible failed fetch error messages per-browser:\n *\n * Chrome: Failed to fetch\n * Edge: Failed to Fetch\n * Firefox: NetworkError when attempting to fetch resource\n * Safari: resource blocked by content blocker\n */\nfunction getNativeFetchImplementation(): FetchImpl {\n /* eslint-disable @typescript-eslint/unbound-method */\n\n // Fast path to avoid DOM I/O\n const global = getGlobalObject<Window>();\n if (isNativeFetch(global.fetch)) {\n return global.fetch.bind(global);\n }\n\n const document = global.document;\n let fetchImpl = global.fetch;\n // eslint-disable-next-line deprecation/deprecation\n if (typeof document?.createElement === `function`) {\n try {\n const sandbox = document.createElement('iframe');\n sandbox.hidden = true;\n document.head.appendChild(sandbox);\n if (sandbox.contentWindow?.fetch) {\n fetchImpl = sandbox.contentWindow.fetch;\n }\n document.head.removeChild(sandbox);\n } catch (e) {\n logger.warn('Could not create sandbox iframe for pure fetch check, bailing to window.fetch: ', e);\n }\n }\n\n return fetchImpl.bind(global);\n /* eslint-enable @typescript-eslint/unbound-method */\n}\n\n/** `fetch` based transport */\nexport class FetchTransport extends BaseTransport {\n /**\n * Fetch API reference which always points to native browser implementation.\n */\n private _fetch: typeof fetch;\n\n public constructor(options: TransportOptions, fetchImpl: FetchImpl = getNativeFetchImplementation()) {\n super(options);\n this._fetch = fetchImpl;\n }\n\n /**\n * @inheritDoc\n */\n public sendEvent(event: Event): PromiseLike<Response> {\n return this._sendRequest(eventToSentryRequest(event, this._api), event);\n }\n\n /**\n * @inheritDoc\n */\n public sendSession(session: Session): PromiseLike<Response> {\n return this._sendRequest(sessionToSentryRequest(session, this._api), session);\n }\n\n /**\n * @param sentryRequest Prepared SentryRequest to be delivered\n * @param originalPayload Original payload used to create SentryRequest\n */\n private _sendRequest(sentryRequest: SentryRequest, originalPayload: Event | Session): PromiseLike<Response> {\n if (this._isRateLimited(sentryRequest.type)) {\n return Promise.reject({\n event: originalPayload,\n type: sentryRequest.type,\n reason: `Transport locked till ${this._disabledUntil(sentryRequest.type)} due to too many requests.`,\n status: 429,\n });\n }\n\n const options: RequestInit = {\n body: sentryRequest.body,\n method: 'POST',\n // Despite all stars in the sky saying that Edge supports old draft syntax, aka 'never', 'always', 'origin' and 'default\n // https://caniuse.com/#feat=referrer-policy\n // It doesn't. And it throw exception instead of ignoring this parameter...\n // REF: https://github.com/getsentry/raven-js/issues/1233\n referrerPolicy: (supportsReferrerPolicy() ? 'origin' : '') as ReferrerPolicy,\n };\n if (this.options.fetchParameters !== undefined) {\n Object.assign(options, this.options.fetchParameters);\n }\n if (this.options.headers !== undefined) {\n options.headers = this.options.headers;\n }\n\n return this._buffer.add(\n new SyncPromise<Response>((resolve, reject) => {\n void this._fetch(sentryRequest.url, options)\n .then(response => {\n const headers = {\n 'x-sentry-rate-limits': response.headers.get('X-Sentry-Rate-Limits'),\n 'retry-after': response.headers.get('Retry-After'),\n };\n this._handleResponse({\n requestType: sentryRequest.type,\n response,\n headers,\n resolve,\n reject,\n });\n })\n .catch(reject);\n }),\n );\n }\n}\n"]} |