useApiGateway.ts
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import { createSharedComposable } from '@vueuse/core'
import type { AsyncDataOptions } from '#app'
type HttpMethod = 'GET' | 'POST' | 'PUT' | 'PATCH' | 'DELETE'
type ApiDataOptions<T> = {
default?: () => T
transform?: (input: unknown) => T
lazy?: boolean
server?: boolean
immediate?: boolean
key?: string
watch?: AsyncDataOptions<T>['watch']
auth?: boolean
remotePath?: string
}
type ApiRequestOptions = {
method?: HttpMethod
body?: RequestInit['body'] | object | null
headers?: Record<string, string>
auth?: boolean
remotePath?: string
}
function trimTrailingSlash(value: string) {
return value.replace(/\/+$/, '')
}
function normalizePath(path: string) {
if (path.startsWith('/')) {
return path
}
return `/${path}`
}
function localPathToRemote(localPath: string) {
if (localPath.startsWith('/api/')) {
return localPath.slice(4)
}
return localPath
}
const _useApiGateway = () => {
const runtimeConfig = useRuntimeConfig()
const token = useState<string | null>('auth-token', () => null)
const apiBase = computed(() => {
const rawBase = typeof runtimeConfig.public.apiBase === 'string' ? runtimeConfig.public.apiBase.trim() : ''
if (!rawBase) {
return ''
}
return trimTrailingSlash(rawBase)
})
const useRemote = computed(() => apiBase.value.length > 0)
const resolvePath = (localPath: string, remotePath?: string) => {
if (!useRemote.value) {
return normalizePath(localPath)
}
const targetPath = remotePath ?? localPathToRemote(localPath)
return normalizePath(targetPath)
}
const buildHeaders = (auth: boolean, customHeaders?: Record<string, string>) => {
const headers = {
...(customHeaders || {})
}
if (auth && token.value) {
headers.Authorization = `Bearer ${token.value}`
}
if (Object.keys(headers).length === 0) {
return undefined
}
return headers
}
const request = <T>(localPath: string, options: ApiRequestOptions = {}) => {
const {
method = 'GET',
body,
headers,
auth = true,
remotePath
} = options
return $fetch<T>(resolvePath(localPath, remotePath), {
baseURL: useRemote.value ? apiBase.value : undefined,
method,
body,
headers: buildHeaders(auth, headers)
})
}
const useApiFetch = <T>(localPath: string, options: ApiDataOptions<T> = {}) => {
const {
default: defaultValue,
transform,
lazy,
server,
immediate,
key,
watch,
auth = true,
remotePath
} = options
const dataKey = key ?? `${useRemote.value ? 'remote' : 'local'}:${resolvePath(localPath, remotePath)}`
return useAsyncData<T>(
dataKey,
async () => {
const raw = await request<unknown>(localPath, {
method: 'GET',
auth,
remotePath
})
if (transform) {
return transform(raw)
}
return raw as T
},
{
default: defaultValue,
lazy,
server,
immediate,
watch
}
)
}
return {
apiBase,
useRemote,
resolvePath,
useApiFetch,
request
}
}
export const useApiGateway = createSharedComposable(_useApiGateway)