Add market resolution API

docs/docs/api.md

@@ -456,7 +456,6 @@ Requires no authorization.
   }
   ```
 
-
 ### `POST /v0/bet`
 
 Places a new bet on behalf of the authorized user.
@@ -514,6 +513,60 @@ $ curl https://manifold.markets/api/v0/market -X POST -H 'Content-Type: applicat
                  "initialProb":25}'
 ```
 
+### `POST /v0/market/[marketId]/resolve`
+
+Resolves a market on behalf of the authorized user.
+
+Parameters:
+
+For binary markets:
+
+- `outcome`: Required. One of `YES`, `NO`, `MKT`, or `CANCEL`.
+- `probabilityInt`: Optional. The probability to use for `MKT` resolution.
+
+For free response markets:
+
+- `outcome`: Required. One of `MKT`, `CANCEL`, or a `number` indicating the Free Response outcome ID.
+- `resolutions`: A map of from outcome => number to use as the weights for resolving in favor of multiple free response options. Can only be set with `MKT` outcome.
+
+For numeric markets:
+
+- `outcome`: Required. One of `CANCEL`, or a `number` indicating the selected numeric bucket ID.
+- `value`: The value that the market may resolves to.
+
+Example request:
+
+```
+# Resolve a binary market
+$ curl https://manifold.markets/api/v0/market -X POST -H 'Content-Type: application/json' \
+    -H 'Authorization: Key {...}'
+    --data-raw '{"contractId":"{...}", \
+                 "outcome":"YES"}'
+
+# Resolve a binary market with a specified probability
+$ curl https://manifold.markets/api/v0/market -X POST -H 'Content-Type: application/json' \
+    -H 'Authorization: Key {...}'
+    --data-raw '{"contractId":"{...}", \
+                 "outcome":"MKT",
+                 "probabilityInt": 75}'
+
+# Resolve a free response market with a single answer chosen
+$ curl https://manifold.markets/api/v0/market -X POST -H 'Content-Type: application/json' \
+    -H 'Authorization: Key {...}'
+    --data-raw '{"contractId":"{...}", \
+                 "outcome":"{...}"}'
+
+# Resolve a free response market with multiple answers chosen
+$ curl https://manifold.markets/api/v0/market -X POST -H 'Content-Type: application/json' \
+    -H 'Authorization: Key {...}'
+    --data-raw '{"contractId":"{...}", \
+                 "outcome":"MKT",
+                 "resolutions": {
+                   "{...}": 1,
+                   "{...}": 2,
+                 }}'
+```
+
 ## Changelog
 
 - 2022-06-08: Add paging to markets endpoint

web/lib/api/proxy.ts

@@ -41,7 +41,12 @@ export const fetchBackend = (req: NextApiRequest, name: string) => {
     'Origin',
   ])
   const hasBody = req.method != 'HEAD' && req.method != 'GET'
-  const opts = { headers, method: req.method, body: hasBody ? req : undefined }
+  const body = req.body ? JSON.stringify(req.body) : req
+  const opts = {
+    headers,
+    method: req.method,
+    body: hasBody ? body : undefined,
+  }
   return fetch(url, opts)
 }
 

web/pages/api/v0/market/[id]/index.ts

@@ -3,7 +3,7 @@ import { listAllBets } from 'web/lib/firebase/bets'
 import { listAllComments } from 'web/lib/firebase/comments'
 import { getContractFromId } from 'web/lib/firebase/contracts'
 import { applyCorsHeaders, CORS_UNRESTRICTED } from 'web/lib/api/cors'
-import { FullMarket, ApiError, toFullMarket } from '../_types'
+import { FullMarket, ApiError, toFullMarket } from '../../_types'
 
 export default async function handler(
   req: NextApiRequest,

web/pages/api/v0/market/[id]/resolve.ts

@@ -0,0 +1,28 @@
+import { NextApiRequest, NextApiResponse } from 'next'
+import {
+  CORS_ORIGIN_MANIFOLD,
+  CORS_ORIGIN_LOCALHOST,
+} from 'common/envs/constants'
+import { applyCorsHeaders } from 'web/lib/api/cors'
+import { fetchBackend, forwardResponse } from 'web/lib/api/proxy'
+
+export const config = { api: { bodyParser: true } }
+
+export default async function route(req: NextApiRequest, res: NextApiResponse) {
+  await applyCorsHeaders(req, res, {
+    origin: [CORS_ORIGIN_MANIFOLD, CORS_ORIGIN_LOCALHOST],
+    methods: 'POST',
+  })
+
+  const { id } = req.query
+  const contractId = id as string
+
+  if (req.body) req.body.contractId = contractId
+  try {
+    const backendRes = await fetchBackend(req, 'resolvemarket')
+    await forwardResponse(res, backendRes)
+  } catch (err) {
+    console.error('Error talking to cloud function: ', err)
+    res.status(500).json({ message: 'Error communicating with backend.' })
+  }
+}