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import { Injectable } from '@angular/core';
import { Observable, from } from 'rxjs';
import { concatMap, map, switchMap, take } from 'rxjs/operators';
import { whenTruthy } from 'ish-core/utils/operators';
import { CopilotEmbeddedFacade } from '../../facades/copilot-embedded.facade';
import { CopilotEmbeddedStreamEvent } from '../../models/copilot-embedded-answer/copilot-embedded-answer.interface';
/**
* Converts the SSE line endings CRLF and CR to LF. A trailing CR is kept, as it may be the first half of a CRLF
* that is split across two chunks; it is converted together with the next chunk.
*/
function normalizeLineEndings(text: string): string {
const pendingCr = text.endsWith('\r');
const normalized = (pendingCr ? text.slice(0, -1) : text).replace(/\r\n?/g, '\n');
return pendingCr ? `${normalized}\r` : normalized;
}
/**
* Parses a single raw SSE event block into a {@link CopilotEmbeddedStreamEvent}.
*
* Flowise wraps the payload as JSON in the `data:` field, e.g. `data:{"event":"token","data":"Hi"}`.
* Falls back to the SSE `event:` field and raw string data if the payload is not JSON.
*/
function parseSseEvent(rawEvent: string): CopilotEmbeddedStreamEvent {
let eventName: string;
const dataLines: string[] = [];
for (const line of rawEvent.split('\n')) {
Iif (line.startsWith('event:')) {
eventName = line.slice(6).trim();
} else Eif (line.startsWith('data:')) {
dataLines.push(line.slice(5).trim());
}
}
const dataString = dataLines.join('\n');
Iif (!dataString && !eventName) {
return;
}
if (dataString === '[DONE]') {
return { event: 'end', data: undefined };
}
try {
const parsed = JSON.parse(dataString);
Eif (parsed && typeof parsed === 'object' && 'event' in parsed) {
return parsed as CopilotEmbeddedStreamEvent;
}
return { event: eventName ?? 'message', data: parsed };
} catch {
return { event: eventName ?? 'message', data: dataString };
}
}
/**
* The Copilot Embedded API Service handles the HTTP interaction with the Flowise API of the configured chatflow.
*
* Every request targets a chatflow-scoped endpoint `{apiHost}/api/v1/{endpoint}/{chatflowid}`; `apiHost` and
* `chatflowid` are read from the Copilot Embedded configuration. Besides plain `get` and `post` requests it
* supports streamed responses via Server-Sent Events ({@link stream}).
*/
@Injectable({ providedIn: 'root' })
export class CopilotEmbeddedApiService {
constructor(
private httpClient: HttpClient,
private copilotEmbeddedFacade: CopilotEmbeddedFacade
) {}
/**
* Sends a GET request to the given chatflow endpoint.
*
* @param endpoint The Flowise endpoint without the chatflow ID, e.g. `chatflows-streaming`.
*/
get<T>(endpoint: string): Observable<T> {
return this.url$(endpoint).pipe(concatMap(url => this.httpClient.get<T>(url)));
}
/**
* Sends a POST request to the given chatflow endpoint.
*
* @param endpoint The Flowise endpoint without the chatflow ID, e.g. `prediction`.
* @param body The request body.
*/
post<T>(endpoint: string, body: unknown): Observable<T> {
return this.url$(endpoint).pipe(concatMap(url => this.httpClient.post<T>(url, body)));
}
/**
* Sends a POST request to the given chatflow endpoint and emits the Server-Sent Events of the response.
*
* Completes when the stream ends and errors on network/HTTP failures. Streaming only works in the browser.
*
* @param endpoint The Flowise endpoint without the chatflow ID, e.g. `prediction`.
* @param body The request body.
*/
stream(endpoint: string, body: unknown): Observable<CopilotEmbeddedStreamEvent> {
return this.url$(endpoint).pipe(concatMap(url => this.fetchEventStream(url, body)));
}
/**
* Builds the URL of a chatflow-scoped endpoint from the Copilot Embedded configuration.
*/
private url$(endpoint: string): Observable<string> {
return this.copilotEmbeddedFacade.configuration$.pipe(
whenTruthy(),
take(1),
map(config => {
if (!config.apiHost || !config.chatflowid) {
throw new Error('Copilot Embedded is not configured (apiHost and chatflowid are required)');
}
return `${config.apiHost}/api/v1/${endpoint}/${config.chatflowid}`;
})
);
}
/**
* Performs the streaming request via the fetch API and parses the Server-Sent Events.
*/
private fetchEventStream(url: string, body: unknown): Observable<CopilotEmbeddedStreamEvent> {
return new Observable<CopilotEmbeddedStreamEvent>(subscriber => {
const abortController = new AbortController();
from(
fetch(url, {
method: 'POST',
headers: { 'Content-Type': 'application/json', Accept: 'text/event-stream' },
body: JSON.stringify(body),
signal: abortController.signal,
})
)
.pipe(switchMap(response => this.readEventStream(response)))
.subscribe({
next: event => subscriber.next(event),
error: error => subscriber.error(error),
complete: () => subscriber.complete(),
});
return () => abortController.abort();
});
}
/**
* Reads a `text/event-stream` response body and emits the parsed Copilot Embedded events.
*/
private readEventStream(response: Response): Observable<CopilotEmbeddedStreamEvent> {
return new Observable<CopilotEmbeddedStreamEvent>(subscriber => {
if (!response.ok) {
subscriber.error(new Error(`Copilot Embedded request failed with status ${response.status}`));
return;
}
Iif (!response.body) {
subscriber.error(new Error('Copilot Embedded response does not provide a readable stream'));
return;
}
const reader = response.body.getReader();
const decoder = new TextDecoder();
let buffer = '';
// SSE events are separated by a blank line.
const emitCompleteEvents = () => {
let boundary = buffer.indexOf('\n\n');
while (boundary !== -1) {
const rawEvent = buffer.slice(0, boundary);
buffer = buffer.slice(boundary + 2);
const event = parseSseEvent(rawEvent);
Eif (event) {
subscriber.next(event);
}
boundary = buffer.indexOf('\n\n');
}
};
const pump = (): Promise<void> =>
reader.read().then(({ done, value }) => {
if (done) {
// a CR kept back for a possible CRLF is a line ending once the stream has ended
buffer = buffer.replace(/\r$/, '\n');
emitCompleteEvents();
subscriber.complete();
return;
}
buffer = normalizeLineEndings(buffer + decoder.decode(value, { stream: true }));
emitCompleteEvents();
return pump();
});
pump().catch(error => subscriber.error(error));
return () => {
reader.cancel();
};
});
}
}
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