Voice Call: add Plivo provider
This commit is contained in:
vrknetha
committed by
Peter Steinberger
Peter Steinberger
parent
0a1eeedc10
commit
946b0229e8
@@ -7,3 +7,4 @@ export {
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} from "./stt-openai-realtime.js";
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export { TelnyxProvider } from "./telnyx.js";
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export { TwilioProvider } from "./twilio.js";
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export { PlivoProvider } from "./plivo.js";
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29
extensions/voice-call/src/providers/plivo.test.ts
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29
extensions/voice-call/src/providers/plivo.test.ts
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@@ -0,0 +1,29 @@
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import { describe, expect, it } from "vitest";
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import { PlivoProvider } from "./plivo.js";
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describe("PlivoProvider", () => {
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it("parses answer callback into call.answered and returns keep-alive XML", () => {
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const provider = new PlivoProvider({
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authId: "MA000000000000000000",
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authToken: "test-token",
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});
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const result = provider.parseWebhookEvent({
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headers: { host: "example.com" },
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rawBody:
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"CallUUID=call-uuid&CallStatus=in-progress&Direction=outbound&From=%2B15550000000&To=%2B15550000001&Event=StartApp",
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url: "https://example.com/voice/webhook?provider=plivo&flow=answer&callId=internal-call-id",
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method: "POST",
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query: { provider: "plivo", flow: "answer", callId: "internal-call-id" },
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});
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expect(result.events).toHaveLength(1);
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expect(result.events[0]?.type).toBe("call.answered");
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expect(result.events[0]?.callId).toBe("internal-call-id");
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expect(result.events[0]?.providerCallId).toBe("call-uuid");
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expect(result.providerResponseBody).toContain("<Wait");
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expect(result.providerResponseBody).toContain('length="300"');
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});
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});
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504
extensions/voice-call/src/providers/plivo.ts
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504
extensions/voice-call/src/providers/plivo.ts
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@@ -0,0 +1,504 @@
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import crypto from "node:crypto";
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import type { PlivoConfig } from "../config.js";
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import type {
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HangupCallInput,
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InitiateCallInput,
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InitiateCallResult,
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NormalizedEvent,
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PlayTtsInput,
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ProviderWebhookParseResult,
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StartListeningInput,
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StopListeningInput,
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WebhookContext,
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WebhookVerificationResult,
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} from "../types.js";
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import { escapeXml } from "../voice-mapping.js";
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import { reconstructWebhookUrl, verifyPlivoWebhook } from "../webhook-security.js";
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import type { VoiceCallProvider } from "./base.js";
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export interface PlivoProviderOptions {
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/** Override public URL origin for signature verification */
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publicUrl?: string;
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/** Skip webhook signature verification (development only) */
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skipVerification?: boolean;
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/** Outbound ring timeout in seconds */
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ringTimeoutSec?: number;
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}
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type PendingSpeak = { text: string; locale?: string };
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type PendingListen = { language?: string };
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export class PlivoProvider implements VoiceCallProvider {
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readonly name = "plivo" as const;
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private readonly authId: string;
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private readonly authToken: string;
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private readonly baseUrl: string;
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private readonly options: PlivoProviderOptions;
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// Best-effort mapping between create-call request UUID and call UUID.
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private requestUuidToCallUuid = new Map<string, string>();
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// Used for transfer URLs and GetInput action URLs.
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private callIdToWebhookUrl = new Map<string, string>();
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private callUuidToWebhookUrl = new Map<string, string>();
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private pendingSpeakByCallId = new Map<string, PendingSpeak>();
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private pendingListenByCallId = new Map<string, PendingListen>();
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constructor(config: PlivoConfig, options: PlivoProviderOptions = {}) {
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if (!config.authId) {
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throw new Error("Plivo Auth ID is required");
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}
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if (!config.authToken) {
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throw new Error("Plivo Auth Token is required");
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}
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this.authId = config.authId;
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this.authToken = config.authToken;
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this.baseUrl = `https://api.plivo.com/v1/Account/${this.authId}`;
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this.options = options;
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}
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private async apiRequest<T = unknown>(params: {
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method: "GET" | "POST" | "DELETE";
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endpoint: string;
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body?: Record<string, unknown>;
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allowNotFound?: boolean;
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}): Promise<T> {
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const { method, endpoint, body, allowNotFound } = params;
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const response = await fetch(`${this.baseUrl}${endpoint}`, {
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method,
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headers: {
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Authorization: `Basic ${Buffer.from(`${this.authId}:${this.authToken}`).toString("base64")}`,
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"Content-Type": "application/json",
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},
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body: body ? JSON.stringify(body) : undefined,
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});
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if (!response.ok) {
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if (allowNotFound && response.status === 404) {
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return undefined as T;
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}
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const errorText = await response.text();
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throw new Error(`Plivo API error: ${response.status} ${errorText}`);
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}
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const text = await response.text();
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return text ? (JSON.parse(text) as T) : (undefined as T);
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}
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verifyWebhook(ctx: WebhookContext): WebhookVerificationResult {
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const result = verifyPlivoWebhook(ctx, this.authToken, {
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publicUrl: this.options.publicUrl,
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skipVerification: this.options.skipVerification,
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});
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if (!result.ok) {
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console.warn(`[plivo] Webhook verification failed: ${result.reason}`);
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}
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return { ok: result.ok, reason: result.reason };
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}
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parseWebhookEvent(ctx: WebhookContext): ProviderWebhookParseResult {
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const flow =
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typeof ctx.query?.flow === "string" ? ctx.query.flow.trim() : "";
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const parsed = this.parseBody(ctx.rawBody);
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if (!parsed) {
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return { events: [], statusCode: 400 };
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}
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// Keep providerCallId mapping for later call control.
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const callUuid = parsed.get("CallUUID") || undefined;
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if (callUuid) {
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const webhookBase = PlivoProvider.baseWebhookUrlFromCtx(ctx);
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if (webhookBase) {
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this.callUuidToWebhookUrl.set(callUuid, webhookBase);
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}
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}
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// Special flows that exist only to return Plivo XML (no events).
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if (flow === "xml-speak") {
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const callId = this.getCallIdFromQuery(ctx);
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const pending = callId ? this.pendingSpeakByCallId.get(callId) : undefined;
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if (callId) this.pendingSpeakByCallId.delete(callId);
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const xml = pending
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? PlivoProvider.xmlSpeak(pending.text, pending.locale)
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: PlivoProvider.xmlKeepAlive();
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return {
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events: [],
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providerResponseBody: xml,
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providerResponseHeaders: { "Content-Type": "text/xml" },
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statusCode: 200,
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};
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}
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if (flow === "xml-listen") {
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const callId = this.getCallIdFromQuery(ctx);
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const pending = callId
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? this.pendingListenByCallId.get(callId)
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: undefined;
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if (callId) this.pendingListenByCallId.delete(callId);
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const actionUrl = this.buildActionUrl(ctx, {
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flow: "getinput",
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callId,
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});
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const xml =
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actionUrl && callId
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? PlivoProvider.xmlGetInputSpeech({
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actionUrl,
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language: pending?.language,
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})
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: PlivoProvider.xmlKeepAlive();
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return {
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events: [],
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providerResponseBody: xml,
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providerResponseHeaders: { "Content-Type": "text/xml" },
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statusCode: 200,
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};
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}
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// Normal events.
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const callIdFromQuery = this.getCallIdFromQuery(ctx);
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const event = this.normalizeEvent(parsed, callIdFromQuery);
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return {
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events: event ? [event] : [],
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providerResponseBody:
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flow === "answer" || flow === "getinput"
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? PlivoProvider.xmlKeepAlive()
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: PlivoProvider.xmlEmpty(),
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providerResponseHeaders: { "Content-Type": "text/xml" },
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statusCode: 200,
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};
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}
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private normalizeEvent(
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params: URLSearchParams,
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callIdOverride?: string,
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): NormalizedEvent | null {
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const callUuid = params.get("CallUUID") || "";
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const requestUuid = params.get("RequestUUID") || "";
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if (requestUuid && callUuid) {
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this.requestUuidToCallUuid.set(requestUuid, callUuid);
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}
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const direction = params.get("Direction");
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const from = params.get("From") || undefined;
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const to = params.get("To") || undefined;
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const callStatus = params.get("CallStatus");
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const baseEvent = {
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id: crypto.randomUUID(),
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callId: callIdOverride || callUuid || requestUuid,
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providerCallId: callUuid || requestUuid || undefined,
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timestamp: Date.now(),
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direction:
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direction === "inbound"
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? ("inbound" as const)
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: direction === "outbound"
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? ("outbound" as const)
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: undefined,
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from,
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to,
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};
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const digits = params.get("Digits");
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if (digits) {
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return { ...baseEvent, type: "call.dtmf", digits };
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}
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const transcript = PlivoProvider.extractTranscript(params);
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if (transcript) {
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return {
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...baseEvent,
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type: "call.speech",
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transcript,
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isFinal: true,
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};
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}
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// Call lifecycle.
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if (callStatus === "ringing") {
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return { ...baseEvent, type: "call.ringing" };
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}
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if (callStatus === "in-progress") {
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return { ...baseEvent, type: "call.answered" };
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}
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if (
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callStatus === "completed" ||
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callStatus === "busy" ||
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callStatus === "no-answer" ||
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callStatus === "failed"
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) {
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return {
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...baseEvent,
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type: "call.ended",
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reason:
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callStatus === "completed"
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? "completed"
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: callStatus === "busy"
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? "busy"
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: callStatus === "no-answer"
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? "no-answer"
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: "failed",
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};
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}
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// Plivo will call our answer_url when the call is answered; if we don't have
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// a CallStatus for some reason, treat it as answered so the call can proceed.
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if (params.get("Event") === "StartApp" && callUuid) {
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return { ...baseEvent, type: "call.answered" };
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}
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return null;
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}
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async initiateCall(input: InitiateCallInput): Promise<InitiateCallResult> {
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const webhookUrl = new URL(input.webhookUrl);
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webhookUrl.searchParams.set("provider", "plivo");
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webhookUrl.searchParams.set("callId", input.callId);
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const answerUrl = new URL(webhookUrl);
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answerUrl.searchParams.set("flow", "answer");
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const hangupUrl = new URL(webhookUrl);
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hangupUrl.searchParams.set("flow", "hangup");
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this.callIdToWebhookUrl.set(input.callId, input.webhookUrl);
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const ringTimeoutSec = this.options.ringTimeoutSec ?? 30;
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const result = await this.apiRequest<PlivoCreateCallResponse>({
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method: "POST",
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endpoint: "/Call/",
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body: {
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from: PlivoProvider.normalizeNumber(input.from),
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to: PlivoProvider.normalizeNumber(input.to),
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answer_url: answerUrl.toString(),
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answer_method: "POST",
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hangup_url: hangupUrl.toString(),
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hangup_method: "POST",
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// Plivo's API uses `hangup_on_ring` for outbound ring timeout.
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hangup_on_ring: ringTimeoutSec,
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},
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});
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const requestUuid = Array.isArray(result.request_uuid)
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? result.request_uuid[0]
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: result.request_uuid;
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if (!requestUuid) {
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throw new Error("Plivo call create returned no request_uuid");
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}
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return { providerCallId: requestUuid, status: "initiated" };
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}
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async hangupCall(input: HangupCallInput): Promise<void> {
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const callUuid = this.requestUuidToCallUuid.get(input.providerCallId);
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if (callUuid) {
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await this.apiRequest({
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method: "DELETE",
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endpoint: `/Call/${callUuid}/`,
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allowNotFound: true,
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});
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return;
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}
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// Best-effort: try hangup (call UUID), then cancel (request UUID).
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await this.apiRequest({
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method: "DELETE",
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endpoint: `/Call/${input.providerCallId}/`,
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allowNotFound: true,
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});
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await this.apiRequest({
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method: "DELETE",
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endpoint: `/Request/${input.providerCallId}/`,
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allowNotFound: true,
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});
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}
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async playTts(input: PlayTtsInput): Promise<void> {
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const callUuid = this.requestUuidToCallUuid.get(input.providerCallId) ??
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input.providerCallId;
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const webhookBase =
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this.callUuidToWebhookUrl.get(callUuid) ||
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this.callIdToWebhookUrl.get(input.callId);
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if (!webhookBase) {
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throw new Error("Missing webhook URL for this call (provider state missing)");
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}
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if (!callUuid) {
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throw new Error("Missing Plivo CallUUID for playTts");
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}
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const transferUrl = new URL(webhookBase);
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transferUrl.searchParams.set("provider", "plivo");
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transferUrl.searchParams.set("flow", "xml-speak");
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transferUrl.searchParams.set("callId", input.callId);
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this.pendingSpeakByCallId.set(input.callId, {
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text: input.text,
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locale: input.locale,
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});
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await this.apiRequest({
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method: "POST",
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endpoint: `/Call/${callUuid}/`,
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body: {
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legs: "aleg",
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aleg_url: transferUrl.toString(),
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aleg_method: "POST",
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},
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});
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}
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async startListening(input: StartListeningInput): Promise<void> {
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const callUuid = this.requestUuidToCallUuid.get(input.providerCallId) ??
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input.providerCallId;
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const webhookBase =
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this.callUuidToWebhookUrl.get(callUuid) ||
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this.callIdToWebhookUrl.get(input.callId);
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if (!webhookBase) {
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throw new Error("Missing webhook URL for this call (provider state missing)");
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}
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if (!callUuid) {
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throw new Error("Missing Plivo CallUUID for startListening");
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}
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const transferUrl = new URL(webhookBase);
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transferUrl.searchParams.set("provider", "plivo");
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transferUrl.searchParams.set("flow", "xml-listen");
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transferUrl.searchParams.set("callId", input.callId);
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this.pendingListenByCallId.set(input.callId, {
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language: input.language,
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});
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await this.apiRequest({
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method: "POST",
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endpoint: `/Call/${callUuid}/`,
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body: {
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legs: "aleg",
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aleg_url: transferUrl.toString(),
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aleg_method: "POST",
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},
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});
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}
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async stopListening(_input: StopListeningInput): Promise<void> {
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// GetInput ends automatically when speech ends.
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}
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private static normalizeNumber(numberOrSip: string): string {
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const trimmed = numberOrSip.trim();
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if (trimmed.toLowerCase().startsWith("sip:")) return trimmed;
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return trimmed.startsWith("+") ? trimmed.slice(1) : trimmed;
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}
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private static xmlEmpty(): string {
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return `<?xml version="1.0" encoding="UTF-8"?><Response></Response>`;
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}
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private static xmlKeepAlive(): string {
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return `<?xml version="1.0" encoding="UTF-8"?>
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<Response>
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<Wait length="300" />
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</Response>`;
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}
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private static xmlSpeak(text: string, locale?: string): string {
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const language = locale || "en-US";
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return `<?xml version="1.0" encoding="UTF-8"?>
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<Response>
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<Speak language="${escapeXml(language)}">${escapeXml(text)}</Speak>
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<Wait length="300" />
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</Response>`;
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}
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private static xmlGetInputSpeech(params: {
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actionUrl: string;
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language?: string;
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}): string {
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const language = params.language || "en-US";
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return `<?xml version="1.0" encoding="UTF-8"?>
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<Response>
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<GetInput inputType="speech" method="POST" action="${escapeXml(params.actionUrl)}" language="${escapeXml(language)}" executionTimeout="30" speechEndTimeout="1" redirect="false">
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</GetInput>
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<Wait length="300" />
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</Response>`;
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}
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private getCallIdFromQuery(ctx: WebhookContext): string | undefined {
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const callId =
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typeof ctx.query?.callId === "string" && ctx.query.callId.trim()
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? ctx.query.callId.trim()
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: undefined;
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return callId || undefined;
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}
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private buildActionUrl(
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ctx: WebhookContext,
|
||||
opts: { flow: string; callId?: string },
|
||||
): string | null {
|
||||
const base = PlivoProvider.baseWebhookUrlFromCtx(ctx);
|
||||
if (!base) return null;
|
||||
|
||||
const u = new URL(base);
|
||||
u.searchParams.set("provider", "plivo");
|
||||
u.searchParams.set("flow", opts.flow);
|
||||
if (opts.callId) u.searchParams.set("callId", opts.callId);
|
||||
return u.toString();
|
||||
}
|
||||
|
||||
private static baseWebhookUrlFromCtx(ctx: WebhookContext): string | null {
|
||||
try {
|
||||
const u = new URL(reconstructWebhookUrl(ctx));
|
||||
return `${u.origin}${u.pathname}`;
|
||||
} catch {
|
||||
return null;
|
||||
}
|
||||
}
|
||||
|
||||
private parseBody(rawBody: string): URLSearchParams | null {
|
||||
try {
|
||||
return new URLSearchParams(rawBody);
|
||||
} catch {
|
||||
return null;
|
||||
}
|
||||
}
|
||||
|
||||
private static extractTranscript(params: URLSearchParams): string | null {
|
||||
const candidates = [
|
||||
"Speech",
|
||||
"Transcription",
|
||||
"TranscriptionText",
|
||||
"SpeechResult",
|
||||
"RecognizedSpeech",
|
||||
"Text",
|
||||
] as const;
|
||||
|
||||
for (const key of candidates) {
|
||||
const value = params.get(key);
|
||||
if (value && value.trim()) return value.trim();
|
||||
}
|
||||
return null;
|
||||
}
|
||||
}
|
||||
|
||||
type PlivoCreateCallResponse = {
|
||||
api_id?: string;
|
||||
message?: string;
|
||||
request_uuid?: string | string[];
|
||||
};
|
||||
Reference in New Issue
Block a user