Support Edge API Route and Edge Config as kv Store

[aidenlx]

Description

• Rewrite API to support https://nextjs.org/docs/api-routes/edge-api-routes, drop axios in favor of fetch API
• Replace token store with https://vercel.com/docs/concepts/edge-network/edge-config
• add path alias to src root dir (@/*) and config dir (@cfg/*)

Both changes should speed up the response time

Note
New features need to be explictly enabled via Edge Config with edge_runtime: true
Required Environment Variable: EDGE_CONFIG and VERCEL_TOKEN

Addition

Considering the nature of Edge Config, It's possible to migrate some config like protectedRoutes and clientId so that changing them won't require rebuilding the website

[vercel]

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Name	Status	Preview	Comments	Updated
onedrive-vercel-index	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Feb 26, 2023 at 3:37PM (UTC)

[spencerwooo]

Thanks! I appreciate the effort. I've been meaning to do this myself.

One question: does dropping ioredis in favor of upstash/redis break support for ppl who use their own Redis instance? I think this would break a handful of sites and I'm inclined to leave this branch as a feature branch and be kept as is.

[aidenlx]

does dropping ioredis in favor of upstash/redis break support for ppl who use their own Redis instance?

In the latest commit I've hidden the new features behide flag so that it won't break existing websites. By default API requests is redirected to function with node runtime that uses ioredis as before, and the new features need to be explictly enabled via Edge Config with edge_runtime: true

[aidenlx]

BTW, although this PR no longer include breaking changes, and the logic of API should be the same, refactoring API with fetch API may introduce unexpected issues. Maybe you can help test it out before merging it if it's convenient for you?

[spencerwooo]

Noted, thanks for the effort. I'll review this asap ;)

[aidenlx]

CDN caching for raw file requests is implemented in cbedcf6. The redirect request is cached for one hour before expire time based on microsoft-graph API document