package matching import ( "github.com/nbutton23/zxcvbn-go/adjacency" "github.com/nbutton23/zxcvbn-go/entropy" "github.com/nbutton23/zxcvbn-go/match" "strings" ) func spatialMatch(password string) (matches []match.Match) { for _, graph := range ADJACENCY_GRAPHS { if graph.Graph != nil { matches = append(matches, spatialMatchHelper(password, graph)...) } } return matches } func spatialMatchHelper(password string, graph adjacency.AdjacencyGraph) (matches []match.Match) { for i := 0; i < len(password)-1; { j := i + 1 lastDirection := -99 //an int that it should never be! turns := 0 shiftedCount := 0 for { prevChar := password[j-1] found := false foundDirection := -1 curDirection := -1 //My graphs seem to be wrong. . . and where the hell is qwerty adjacents := graph.Graph[string(prevChar)] //Consider growing pattern by one character if j hasn't gone over the edge if j < len(password) { curChar := password[j] for _, adj := range adjacents { curDirection += 1 if strings.Index(adj, string(curChar)) != -1 { found = true foundDirection = curDirection if strings.Index(adj, string(curChar)) == 1 { //index 1 in the adjacency means the key is shifted, 0 means unshifted: A vs a, % vs 5, etc. //for example, 'q' is adjacent to the entry '2@'. @ is shifted w/ index 1, 2 is unshifted. shiftedCount += 1 } if lastDirection != foundDirection { //adding a turn is correct even in the initial case when last_direction is null: //every spatial pattern starts with a turn. turns += 1 lastDirection = foundDirection } break } } } //if the current pattern continued, extend j and try to grow again if found { j += 1 } else { //otherwise push the pattern discovered so far, if any... //don't consider length 1 or 2 chains. if j-i > 2 { matchSpc := match.Match{Pattern: "spatial", I: i, J: j - 1, Token: password[i:j], DictionaryName: graph.Name} matchSpc.Entropy = entropy.SpatialEntropy(matchSpc, turns, shiftedCount) matches = append(matches, matchSpc) } //. . . and then start a new search from the rest of the password i = j break } } } return matches }