Add fetchUrl/externalUrl settings for configured sites.

@@ -7,6 +7,8 @@ import { parseHtml } from './html.ts'
 interface SiteConfig {
   name: string,
   baseUrl: string,
+  fetchUrl: string,
+  externalUrl: string,
 }
 
 export const configSlice = createSlice({
@@ -15,14 +17,25 @@ export const configSlice = createSlice({
     sites: {},
   },
   reducers: {
-    setSiteConfig(state, { payload: { name, baseUrl } }) {
+    setSiteConfig(state, { payload: { name, baseUrl, fetchUrl, externalUrl } }) {
       if (!state.sites[ name ]) state.sites[ name ] = {}
-      Object.assign(state.sites[ name ], { baseUrl })
+      Object.assign(state.sites[ name ], { baseUrl, fetchUrl, externalUrl })
     }
   },
   selectors: {
     getSites: (state) => Object.keys(state.sites).filter(site => site !== 'default'),
-    getSiteBaseUrl: (state, name) => state.sites?.[ name ]?.baseUrl,
+    getSiteBaseUrl: (state, name) => {
+      const { sites: { [ name ]: siteConfig = {} } = {} } = state
+      return siteConfig.baseUrl
+    },
+    getSiteFetchUrl: (state, name) => {
+      const { sites: { [ name ]: siteConfig = {} } = {} } = state
+      return siteConfig.fetchUrl || siteConfig.baseUrl
+    },
+    getSiteExternalUrl: (state, name) => {
+      const { sites: { [ name ]: siteConfig = {} } = {} } = state
+      return siteConfig.externalUrl || siteConfig.baseUrl
+    },
   },
 })
 
@@ -31,8 +44,8 @@ const baseQuery = fetchBaseQuery()
 
 const siteBaseQuery = async (args, api, options) => {
   const { site, url } = args
-  const baseUrl = getSiteBaseUrl(site) || ''
-  return baseQuery({ ...args, url: `${baseUrl}${url}` }, api, options)
+  const fetchUrl = getSiteFetchUrl(site) || ''
+  return baseQuery({ ...args, url: `${fetchUrl}${url}` }, api, options)
 }
 
 export const sitePageSlice = createApi({
@@ -99,6 +112,14 @@ export const getSiteBaseUrl = (name: string): string => {
   return configSlice.selectors.getSiteBaseUrl(store.getState(), name)
 }
 
+export const getSiteFetchUrl = (name: string): string => {
+  return configSlice.selectors.getSiteFetchUrl(store.getState(), name)
+}
+
+export const getSiteExternalUrl = (name: string): string => {
+  return configSlice.selectors.getSiteExternalUrl(store.getState(), name)
+}
+
 export const clearAll = () => {
   return store.dispatch(sitePageSlice.util.invalidateTags([ 'Page' ]))
 }