Add some API endpoints for reading group info (#707)

docs/docs/api.md

@@ -46,6 +46,24 @@ Gets a user by their unique ID. Many other API endpoints return this as the `use
 
 Requires no authorization.
 
+### `GET /v0/groups`
+
+Gets all groups, in no particular order.
+
+Requires no authorization.
+
+### `GET /v0/groups/[slug]`
+
+Gets a group by its slug.
+
+Requires no authorization.
+
+### `GET /v0/groups/by-id/[id]`
+
+Gets a group by its unique ID.
+
+Requires no authorization.
+
 ### `GET /v0/markets`
 
 Lists all markets, ordered by creation date descending.

web/pages/api/v0/group/[slug].ts

@@ -0,0 +1,18 @@
+import { NextApiRequest, NextApiResponse } from 'next'
+import { getGroupBySlug } from 'web/lib/firebase/groups'
+import { applyCorsHeaders, CORS_UNRESTRICTED } from 'web/lib/api/cors'
+
+export default async function handler(
+  req: NextApiRequest,
+  res: NextApiResponse
+) {
+  await applyCorsHeaders(req, res, CORS_UNRESTRICTED)
+  const { slug } = req.query
+  const group = await getGroupBySlug(slug as string)
+  if (!group) {
+    res.status(404).json({ error: 'Group not found' })
+    return
+  }
+  res.setHeader('Cache-Control', 'no-cache')
+  return res.status(200).json(group)
+}

web/pages/api/v0/group/by-id/[id].ts

@@ -0,0 +1,18 @@
+import { NextApiRequest, NextApiResponse } from 'next'
+import { getGroup } from 'web/lib/firebase/groups'
+import { applyCorsHeaders, CORS_UNRESTRICTED } from 'web/lib/api/cors'
+
+export default async function handler(
+  req: NextApiRequest,
+  res: NextApiResponse
+) {
+  await applyCorsHeaders(req, res, CORS_UNRESTRICTED)
+  const { id } = req.query
+  const group = await getGroup(id as string)
+  if (!group) {
+    res.status(404).json({ error: 'Group not found' })
+    return
+  }
+  res.setHeader('Cache-Control', 'no-cache')
+  return res.status(200).json(group)
+}

web/pages/api/v0/groups.ts

@@ -0,0 +1,15 @@
+import type { NextApiRequest, NextApiResponse } from 'next'
+import { listAllGroups } from 'web/lib/firebase/groups'
+import { applyCorsHeaders, CORS_UNRESTRICTED } from 'web/lib/api/cors'
+
+type Data = any[]
+
+export default async function handler(
+  req: NextApiRequest,
+  res: NextApiResponse<Data>
+) {
+  await applyCorsHeaders(req, res, CORS_UNRESTRICTED)
+  const groups = await listAllGroups()
+  res.setHeader('Cache-Control', 'max-age=0')
+  res.status(200).json(groups)
+}