@@ -0,0 +1,87 @@
1+type OpenRouterExtraParamsContext = {
2+config?: {
3+models?: {
4+providers?: Record<
5+string,
6+{
7+params?: Record<string, unknown>;
8+}
9+>;
10+};
11+};
12+extraParams: Record<string, unknown>;
13+provider: string;
14+model?: {
15+params?: Record<string, unknown>;
16+};
17+};
18+19+const BLOCKED_RECORD_KEYS = new Set(["__proto__", "prototype", "constructor"]);
20+21+function sanitizeJsonLikeValue(value: unknown): unknown {
22+if (value === undefined) {
23+return undefined;
24+}
25+if (Array.isArray(value)) {
26+return value.map(sanitizeJsonLikeValue).filter((entry) => entry !== undefined);
27+}
28+if (!value || typeof value !== "object") {
29+return value;
30+}
31+return sanitizeRecord(value as Record<string, unknown>);
32+}
33+34+function sanitizeRecord(value: Record<string, unknown>): Record<string, unknown> {
35+return Object.fromEntries(
36+Object.entries(value)
37+.filter(([key, entry]) => !BLOCKED_RECORD_KEYS.has(key) && entry !== undefined)
38+.map(([key, entry]) => [key, sanitizeJsonLikeValue(entry)]),
39+);
40+}
41+42+function readRecord(value: unknown): Record<string, unknown> | undefined {
43+if (!value || typeof value !== "object" || Array.isArray(value)) {
44+return undefined;
45+}
46+const sanitized = sanitizeRecord(value as Record<string, unknown>);
47+return Object.keys(sanitized).length > 0 ? sanitized : undefined;
48+}
49+50+function mergeOpenRouterProviderRouting(params: {
51+providerParams?: Record<string, unknown>;
52+modelParams?: Record<string, unknown>;
53+extraParams: Record<string, unknown>;
54+}): Record<string, unknown> | undefined {
55+const providerRouting = readRecord(params.providerParams?.provider);
56+const modelRouting = readRecord(params.modelParams?.provider);
57+const extraRouting = readRecord(params.extraParams.provider);
58+const merged = {
59+ ...(providerRouting ?? {}),
60+ ...(modelRouting ?? {}),
61+ ...(extraRouting ?? {}),
62+};
63+return Object.keys(merged).length > 0 ? merged : undefined;
64+}
65+66+export function resolveOpenRouterExtraParamsForTransport(
67+ctx: OpenRouterExtraParamsContext,
68+): { patch?: Record<string, unknown> } | undefined {
69+const providerConfigParams = readRecord(ctx.config?.models?.providers?.[ctx.provider]?.params);
70+const modelParams = readRecord(ctx.model?.params);
71+const providerRouting = mergeOpenRouterProviderRouting({
72+providerParams: providerConfigParams,
73+ modelParams,
74+extraParams: ctx.extraParams,
75+});
76+if (!providerConfigParams && !modelParams && !providerRouting) {
77+return undefined;
78+}
79+return {
80+patch: {
81+ ...(providerConfigParams ?? {}),
82+ ...(modelParams ?? {}),
83+ ...ctx.extraParams,
84+ ...(providerRouting ? { provider: providerRouting } : {}),
85+},
86+};
87+}
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