core: add avatar provider API

packages/hydrooj/src/lib/avatar.ts

@@ -0,0 +1,20 @@
+import { md5 } from './crypto';
+
+type AvatarProvider = (src: string, size: number) => string;
+
+export const providers: Record<string, AvatarProvider> = {
+    gravatar: (email, size) => `//gravatar.loli.net/avatar/${md5((email || '').toString().trim().toLowerCase())}?d=mm&s=${size || 32}`,
+    qq: (id) => `//q1.qlogo.cn/g?b=qq&nk=${/(\d+)/g.exec(id)[1]}&s=640`,
+    github: (id, size) => `//github.com/${id}.png?size=${Math.min(size, 460)}`,
+};
+
+function avatar(src: string, size = 64) {
+    const index = src.indexOf(':');
+    if (index === -1) return providers.gravatar('', size);
+    const [provider, str] = [src.substr(0, index), src.substr(index + 1, src.length)];
+    if (!providers[provider] || !str) return providers.gravatar('', size);
+    return providers[provider](str, size);
+}
+
+export default avatar;
+global.Hydro.lib.avatar = avatar;

packages/hydrooj/src/lib/misc.ts

@@ -1,7 +1,6 @@
 import AnsiUp from 'ansi_up';
 import { ObjectID } from 'mongodb';
 import { size, formatSeconds } from '@hydrooj/utils/lib/utils';
-import { md5 } from './crypto';
 
 export { size, formatSeconds } from '@hydrooj/utils/lib/utils';
 
@@ -11,10 +10,6 @@ export function ansiToHtml(str: string) {
     return AU.ansi_to_html(str);
 }
 
-export function gravatar(email: string, s = 32) {
-    return `//gravatar.loli.net/avatar/${md5((email || '').toString().trim().toLowerCase())}?d=mm&s=${s}`;
-}
-
 export function datetimeSpan(dt: Date | ObjectID, relative = true, format = '%Y-%m-%d %H:%M:%S') {
     if (!dt) return 'DATETIME_SPAN_ERROR';
     if (dt instanceof ObjectID) dt = new Date(dt.generationTime * 1000);
@@ -53,5 +48,5 @@ export function* paginate(page: number, numPages: number) {
 }
 
 global.Hydro.lib.misc = {
-    gravatar, datetimeSpan, paginate, size, formatSeconds, ansiToHtml,
+    datetimeSpan, paginate, size, formatSeconds, ansiToHtml,
 };