From 4f01edb9230f58ff84b0dd892c931ec8ac9aad55 Mon Sep 17 00:00:00 2001
From: Brian Picciano <mediocregopher@gmail.com>
Date: Tue, 13 Sep 2022 12:56:08 +0200
Subject: move src out of srv, clean up default.nix and Makefile

---
 src/http/pow.go | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 src/http/pow.go

(limited to 'src/http/pow.go')

diff --git a/src/http/pow.go b/src/http/pow.go
new file mode 100644
index 0000000..1bd5cb5
--- /dev/null
+++ b/src/http/pow.go
@@ -0,0 +1,53 @@
+package http
+
+import (
+	"encoding/hex"
+	"errors"
+	"fmt"
+	"net/http"
+
+	"github.com/mediocregopher/blog.mediocregopher.com/srv/http/apiutil"
+)
+
+func (a *api) newPowChallengeHandler() http.Handler {
+	return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
+
+		challenge := a.params.PowManager.NewChallenge()
+
+		apiutil.JSONResult(rw, r, struct {
+			Seed   string `json:"seed"`
+			Target uint32 `json:"target"`
+		}{
+			Seed:   hex.EncodeToString(challenge.Seed),
+			Target: challenge.Target,
+		})
+	})
+}
+
+func (a *api) requirePowMiddleware(h http.Handler) http.Handler {
+	return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
+
+		seedHex := r.FormValue("powSeed")
+		seed, err := hex.DecodeString(seedHex)
+		if err != nil || len(seed) == 0 {
+			apiutil.BadRequest(rw, r, errors.New("invalid powSeed"))
+			return
+		}
+
+		solutionHex := r.FormValue("powSolution")
+		solution, err := hex.DecodeString(solutionHex)
+		if err != nil || len(seed) == 0 {
+			apiutil.BadRequest(rw, r, errors.New("invalid powSolution"))
+			return
+		}
+
+		err = a.params.PowManager.CheckSolution(seed, solution)
+
+		if err != nil {
+			apiutil.BadRequest(rw, r, fmt.Errorf("checking proof-of-work solution: %w", err))
+			return
+		}
+
+		h.ServeHTTP(rw, r)
+	})
+}
-- 
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