Fix various problems with the srv build

1 files changed, 53 insertions, 0 deletions

diff --git a/srv/src/api/pow.go b/srv/src/api/pow.go
new file mode 100644
index 0000000..1b232b1
--- /dev/null
+++ b/srv/src/api/pow.go
@@ -0,0 +1,53 @@
+package api
+
+import (
+	"encoding/hex"
+	"errors"
+	"fmt"
+	"net/http"
+
+	"github.com/mediocregopher/blog.mediocregopher.com/srv/api/apiutils"
+)
+
+func (a *api) newPowChallengeHandler() http.Handler {
+	return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
+
+		challenge := a.params.PowManager.NewChallenge()
+
+		apiutils.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 {
+			apiutils.BadRequest(rw, r, errors.New("invalid powSeed"))
+			return
+		}
+
+		solutionHex := r.FormValue("powSolution")
+		solution, err := hex.DecodeString(solutionHex)
+		if err != nil || len(seed) == 0 {
+			apiutils.BadRequest(rw, r, errors.New("invalid powSolution"))
+			return
+		}
+
+		err = a.params.PowManager.CheckSolution(seed, solution)
+
+		if err != nil {
+			apiutils.BadRequest(rw, r, fmt.Errorf("checking proof-of-work solution: %w", err))
+			return
+		}
+
+		h.ServeHTTP(rw, r)
+	})
+}