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51 lines
1.2 KiB
51 lines
1.2 KiB
package main
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import (
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"encoding/hex"
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"errors"
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"fmt"
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"net/http"
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"github.com/mediocregopher/blog.mediocregopher.com/srv/pow"
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)
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func newPowChallengeHandler(mgr pow.Manager) http.Handler {
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return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
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challenge := mgr.NewChallenge()
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jsonResult(rw, r, struct {
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Seed string `json:"seed"`
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Target uint32 `json:"target"`
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}{
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Seed: hex.EncodeToString(challenge.Seed),
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Target: challenge.Target,
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})
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})
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}
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func requirePowMiddleware(mgr pow.Manager, h http.Handler) http.Handler {
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return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
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seedHex := r.PostFormValue("powSeed")
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seed, err := hex.DecodeString(seedHex)
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if err != nil || len(seed) == 0 {
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badRequest(rw, r, errors.New("invalid powSeed"))
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return
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}
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solutionHex := r.PostFormValue("powSolution")
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solution, err := hex.DecodeString(solutionHex)
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if err != nil || len(seed) == 0 {
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badRequest(rw, r, errors.New("invalid powSolution"))
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return
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}
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if err := mgr.CheckSolution(seed, solution); err != nil {
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badRequest(rw, r, fmt.Errorf("checking proof-of-work solution: %w", err))
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return
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}
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h.ServeHTTP(rw, r)
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})
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}
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