38 lines
1.7 KiB
TypeScript
38 lines
1.7 KiB
TypeScript
import { isSystemProxyBaseUrl, resolveBackendApiUrl, type AiConfig, type ChannelHeader } from "@/stores/use-config-store";
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type RelayConfig = Pick<AiConfig, "baseUrl" | "apiKey" | "apiFormat"> & { headers?: ChannelHeader[] };
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export type ChannelRequest = {
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url: string;
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headers: Record<string, string>;
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credentials: RequestCredentials;
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};
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/** 自定义渠道统一经登录态后端中转，避免依赖第三方服务的浏览器 CORS。 */
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export function channelRequest(config: RelayConfig, upstreamUrl: string, headers: HeadersInit = {}): ChannelRequest {
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const normalizedHeaders = new Headers(headers);
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if (isSystemProxyBaseUrl(config.baseUrl)) {
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return { url: upstreamUrl, headers: Object.fromEntries(normalizedHeaders.entries()), credentials: "include" };
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}
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const normalizedUpstreamUrl = new URL(upstreamUrl).toString();
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normalizedHeaders.delete("X-Canvas-Upstream-Headers");
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normalizedHeaders.delete("x-goog-api-key");
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normalizedHeaders.set("Authorization", `Bearer ${config.apiKey}`);
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normalizedHeaders.set("X-Canvas-Upstream-URL", normalizedUpstreamUrl);
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normalizedHeaders.set("X-Canvas-Upstream-Format", config.apiFormat === "gemini" ? "gemini" : "openai");
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if (config.headers?.length) normalizedHeaders.set("X-Canvas-Upstream-Headers", encodeChannelHeaders(config.headers));
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return {
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url: resolveBackendApiUrl("/api/ai/custom"),
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headers: Object.fromEntries(normalizedHeaders.entries()),
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credentials: "include",
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};
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}
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function encodeChannelHeaders(headers: ChannelHeader[]) {
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const bytes = new TextEncoder().encode(JSON.stringify(headers));
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let binary = "";
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for (const byte of bytes) binary += String.fromCharCode(byte);
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return btoa(binary);
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}
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