Files
OmniRoute/open-sse/handlers/chatCore/targetFormat.ts

63 lines
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TypeScript

/**
* chatCore wire target-format resolver (Quality Gate v2 / Fase 9 — chatCore god-file
* decomposition, #3501).
*
* Pure resolution of the provider alias + the upstream target format used to translate the request:
* apiFormat==="responses" forces OpenAI Responses; otherwise the model's registry target format, then
* the per-model custom override (#2905), then AgentRouter's matching inbound protocol when the
* connection has no explicit override, then the provider default. Returns both `alias` (reused by
* the handler when stripping the `alias/` prefix off the upstream model id) and `targetFormat`.
* Side-effect-free; sits alongside the other request-setup resolvers
* (resolveChatCoreRequestSetup / resolveChatCoreRequestFormat).
*/
import { PROVIDER_ID_TO_ALIAS, getModelTargetFormat } from "../../config/providerModels.ts";
import { getTargetFormat } from "../../services/provider.ts";
import { FORMATS } from "../../translator/formats.ts";
export function resolveChatCoreTargetFormat(opts: {
provider: string;
resolvedModel: string;
apiFormat: string | undefined;
sourceFormat?: string;
customModelTargetFormat: string | undefined;
providerSpecificData: unknown;
nativeXaiResponsesPassthrough?: boolean;
}) {
const {
provider,
resolvedModel,
apiFormat,
sourceFormat,
customModelTargetFormat,
providerSpecificData,
nativeXaiResponsesPassthrough = false,
} = opts;
const alias = PROVIDER_ID_TO_ALIAS[provider] || provider;
const modelTargetFormat = getModelTargetFormat(alias, resolvedModel);
const explicitConnectionTargetFormat = (
providerSpecificData as { targetFormat?: unknown } | null | undefined
)?.targetFormat;
const inferredAgentRouterTargetFormat =
provider === "agentrouter" &&
!(typeof explicitConnectionTargetFormat === "string" && explicitConnectionTargetFormat) &&
(sourceFormat === FORMATS.OPENAI_RESPONSES ||
sourceFormat === FORMATS.OPENAI ||
sourceFormat === FORMATS.CLAUDE)
? sourceFormat
: undefined;
// #8994: model-level targetFormat overrides (from registry or custom-model DB override)
// take precedence over apiFormat="responses" — otherwise Vertex Claude models with
// targetFormat="claude" get wrongly routed to OpenAI Responses format.
let targetFormat =
modelTargetFormat ||
customModelTargetFormat ||
(apiFormat === "responses"
? FORMATS.OPENAI_RESPONSES
: inferredAgentRouterTargetFormat || getTargetFormat(provider, providerSpecificData));
if (nativeXaiResponsesPassthrough) targetFormat = FORMATS.OPENAI_RESPONSES;
return { alias, targetFormat };
}
export type ChatCoreTargetFormat = ReturnType<typeof resolveChatCoreTargetFormat>;