Accept a CID or a multihash to lookup

Closes #67

main.go

@@ -14,6 +14,8 @@ import (
 	"github.com/ipfs/go-cid"
 	"github.com/libp2p/go-libp2p/core/peer"
 	"github.com/multiformats/go-multiaddr"
+	"github.com/multiformats/go-multicodec"
+	"github.com/multiformats/go-multihash"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/collectors"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
@@ -108,8 +110,15 @@ func startServer(ctx context.Context, d *daemon, tcpListener, metricsUsername, m
 		}
 		cidKey, err := cid.Decode(cidStr)
 		if err != nil {
-			http.Error(w, err.Error(), http.StatusBadRequest)
-			return
+			mh, mhErr := multihash.FromB58String(cidStr)
+			if mhErr != nil {
+				mh, mhErr = multihash.FromHexString(cidStr)
+				if mhErr != nil {
+					http.Error(w, err.Error(), http.StatusBadRequest)
+					return
+				}
+			}
+			cidKey = cid.NewCidV1(uint64(multicodec.Cidv1), mh)
 		}
 
 		checkTimeout := defaultCheckTimeout

web/index.html

@@ -25,7 +25,7 @@ <h1 class="dib pa3 ma0 lh-tight">
     </section>
     <section class="bg-near-white">
         <form id="queryForm" class="mw8 center lh-copy dark-gray br2 pv4 ph2 ph4-ns">
-            <label class="db mt3 f6 fw6" for="cid">CID</label>
+            <label class="db mt3 f6 fw6" for="cid">CID or multihash</label>
             <input class="db w-100 pa2" type="text" id="cid" name="cid" required>
             <label class="db mt3 f6 fw6" for="ma">Multiaddr (optional)</label>
             <input class="db w-100 pa2" type="text" id="multiaddr" name="multiaddr" placeholder="/p2p/12D3Koo..." />