80 lines
3.1 KiB
TypeScript
80 lines
3.1 KiB
TypeScript
import type { Api, Model } from "@mariozechner/pi-ai";
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function isOpenAiCompletionsModel(model: Model<Api>): model is Model<"openai-completions"> {
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return model.api === "openai-completions";
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}
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/**
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* Returns true only for endpoints that are confirmed to be native OpenAI
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* infrastructure and therefore accept the `developer` message role.
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* Azure OpenAI uses the Chat Completions API and does NOT accept `developer`.
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* All other openai-completions backends (proxies, Qwen, GLM, DeepSeek, etc.)
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* only support the standard `system` role.
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*/
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function isOpenAINativeEndpoint(baseUrl: string): boolean {
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try {
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const host = new URL(baseUrl).hostname.toLowerCase();
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return host === "api.openai.com";
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} catch {
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return false;
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}
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}
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function isAnthropicMessagesModel(model: Model<Api>): model is Model<"anthropic-messages"> {
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return model.api === "anthropic-messages";
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}
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/**
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* pi-ai constructs the Anthropic API endpoint as `${baseUrl}/v1/messages`.
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* If a user configures `baseUrl` with a trailing `/v1` (e.g. the previously
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* recommended format "https://api.anthropic.com/v1"), the resulting URL
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* becomes "…/v1/v1/messages" which the Anthropic API rejects with a 404.
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*
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* Strip a single trailing `/v1` (with optional trailing slash) from the
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* baseUrl for anthropic-messages models so users with either format work.
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*/
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function normalizeAnthropicBaseUrl(baseUrl: string): string {
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return baseUrl.replace(/\/v1\/?$/, "");
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}
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export function normalizeModelCompat(model: Model<Api>): Model<Api> {
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const baseUrl = model.baseUrl ?? "";
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// Normalise anthropic-messages baseUrl: strip trailing /v1 that users may
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// have included in their config. pi-ai appends /v1/messages itself.
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if (isAnthropicMessagesModel(model) && baseUrl) {
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const normalised = normalizeAnthropicBaseUrl(baseUrl);
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if (normalised !== baseUrl) {
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return { ...model, baseUrl: normalised } as Model<"anthropic-messages">;
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}
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}
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if (!isOpenAiCompletionsModel(model)) {
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return model;
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}
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// The `developer` role and stream usage chunks are OpenAI-native behaviors.
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// Many OpenAI-compatible backends reject `developer` and/or emit usage-only
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// chunks that break strict parsers expecting choices[0]. For non-native
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// openai-completions endpoints, force both compat flags off.
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const compat = model.compat ?? undefined;
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// When baseUrl is empty the pi-ai library defaults to api.openai.com, so
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// leave compat unchanged and let default native behavior apply.
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// Note: explicit true values are intentionally overridden for non-native
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// endpoints for safety.
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const needsForce = baseUrl ? !isOpenAINativeEndpoint(baseUrl) : false;
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if (!needsForce) {
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return model;
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}
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if (compat?.supportsDeveloperRole === false && compat?.supportsUsageInStreaming === false) {
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return model;
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}
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// Return a new object — do not mutate the caller's model reference.
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return {
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...model,
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compat: compat
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? { ...compat, supportsDeveloperRole: false, supportsUsageInStreaming: false }
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: { supportsDeveloperRole: false, supportsUsageInStreaming: false },
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} as typeof model;
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}
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