add hosts and v2 contracts to search

explorer/explorer.go

@@ -445,5 +445,19 @@ func (e *Explorer) Search(id types.Hash256) (SearchType, error) {
 		return SearchTypeContract, nil
 	}
 
+	v2Contracts, err := e.V2Contracts([]types.FileContractID{types.FileContractID(id)})
+	if err != nil {
+		return SearchTypeInvalid, err
+	} else if len(v2Contracts) > 0 {
+		return SearchTypeV2Contract, nil
+	}
+
+	hosts, err := e.Hosts([]types.PublicKey{types.PublicKey(id)})
+	if err != nil {
+		return SearchTypeInvalid, err
+	} else if len(hosts) > 0 {
+		return SearchTypeHost, nil
+	}
+
 	return SearchTypeInvalid, errors.New("no such element")
 }

explorer/types.go

@@ -93,6 +93,10 @@ const (
 	SearchTypeSiafundElement SearchType = "siafundElement"
 	// SearchTypeContract means we found a contract with the given ID.
 	SearchTypeContract SearchType = "contract"
+	// SearchTypeV2Contract means we found a V2 contract with the given ID.
+	SearchTypeV2Contract SearchType = "v2contract"
+	// SearchTypeHost means we found a host with the given pubkey.
+	SearchTypeHost SearchType = "host"
 )
 
 // A ResolutionType represents the type of a v2 file contract resolution.