File size: 2,095 Bytes
96dd062 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 | import { coverImageConfig } from "@/config/coverImageConfig";
import { siteConfig } from "@/config/siteConfig";
import type { ImageFormat } from "@/types/config";
const { randomCoverImage } = coverImageConfig;
/**
* 处理文章封面图
* 当image字段为"api"时，返回带有唯一标识的API URL
* @param image - 文章frontmatter中的image字段值
* @param seed - 用于生成唯一URL的种子（文章id或slug）
*/
export function processCoverImageSync(
image: string | undefined,
seed?: string,
): string {
if (!image || image === "") {
return "";
}
if (image !== "api") {
return image;
}
if (
!randomCoverImage.enable ||
!randomCoverImage.apis ||
randomCoverImage.apis.length === 0
) {
return "";
}
// 根据seed生成hash，确保同一篇文章始终使用相同的API和参数
const hash = seed
? seed.split("").reduce((acc, char) => {
return ((acc << 5) - acc + char.charCodeAt(0)) | 0;
}, 0)
: 0;
// 用hash确定性地选择API（同一篇文章始终选同一个API）
const apiIndex = Math.abs(hash) % randomCoverImage.apis.length;
let apiUrl = randomCoverImage.apis[apiIndex];
// 添加hash参数确保每篇文章获取不同图片
if (seed) {
const separator = apiUrl.includes("?") ? "&" : "?";
apiUrl = `${apiUrl}${separator}v=${Math.abs(hash)}`;
}
return apiUrl;
}
/**
* 获取图片优化格式配置
*/
export function getImageFormats(): ImageFormat[] {
const formatConfig = siteConfig.imageOptimization?.formats ?? "both";
switch (formatConfig) {
case "avif":
return ["avif"];
case "webp":
return ["webp"];
default:
return ["avif", "webp"];
}
}
/**
* 获取图片优化质量配置
*/
export function getImageQuality(): number {
return siteConfig.imageOptimization?.quality ?? 80;
}
/**
* 获取图片回退格式
*/
export function getFallbackFormat(): "avif" | "webp" {
const formatConfig = siteConfig.imageOptimization?.formats ?? "both";
return formatConfig === "avif" ? "avif" : "webp";
}
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