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| 1 | +package response_filter |
| 2 | + |
| 3 | +import ( |
| 4 | + "fmt" |
| 5 | + http_service "github.com/eolinker/eosc/eocontext/http-context" |
| 6 | + "github.com/ohler55/ojg/jp" |
| 7 | + "github.com/ohler55/ojg/oj" |
| 8 | + "strings" |
| 9 | +) |
| 10 | + |
| 11 | +func removeDuplicateStrings(input []string) []string { |
| 12 | + seen := make(map[string]struct{}) |
| 13 | + result := make([]string, 0, len(input)) |
| 14 | + for _, str := range input { |
| 15 | + if str == "" { |
| 16 | + continue |
| 17 | + } |
| 18 | + if _, exists := seen[str]; !exists { |
| 19 | + seen[str] = struct{}{} |
| 20 | + result = append(result, str) |
| 21 | + } |
| 22 | + } |
| 23 | + |
| 24 | + return result |
| 25 | +} |
| 26 | + |
| 27 | +type IFilter interface { |
| 28 | + Filter(ctx http_service.IHttpContext) error |
| 29 | +} |
| 30 | + |
| 31 | +func NewBodyWhiteFilter(keys []string) (IFilter, error) { |
| 32 | + rules, err := SafeCompile(removeDuplicateStrings(keys)) |
| 33 | + if err != nil { |
| 34 | + return nil, err |
| 35 | + } |
| 36 | + return &BodyWhiteFilter{rules: rules}, nil |
| 37 | +} |
| 38 | + |
| 39 | +type BodyWhiteFilter struct { |
| 40 | + rules []CompiledRule |
| 41 | +} |
| 42 | + |
| 43 | +func (b *BodyWhiteFilter) Filter(ctx http_service.IHttpContext) error { |
| 44 | + newBody, err := Extract(string(ctx.Response().GetBody()), b.rules) |
| 45 | + if err != nil { |
| 46 | + return fmt.Errorf("failed to generate new body: %v", err) |
| 47 | + } |
| 48 | + ctx.Response().SetBody([]byte(newBody)) |
| 49 | + return nil |
| 50 | +} |
| 51 | + |
| 52 | +func NewBodyBlackFilter(keys []string) (IFilter, error) { |
| 53 | + es, err := newExprSlice(removeDuplicateStrings(keys)) |
| 54 | + if err != nil { |
| 55 | + return nil, err |
| 56 | + } |
| 57 | + return &BodyBlackFilter{es: es}, nil |
| 58 | +} |
| 59 | + |
| 60 | +type BodyBlackFilter struct { |
| 61 | + es []jp.Expr |
| 62 | +} |
| 63 | + |
| 64 | +func (b *BodyBlackFilter) Filter(ctx http_service.IHttpContext) error { |
| 65 | + body := ctx.Response().GetBody() |
| 66 | + n, err := oj.Parse(body) |
| 67 | + if err != nil { |
| 68 | + return err |
| 69 | + } |
| 70 | + for _, filter := range b.es { |
| 71 | + filter.Del(n) |
| 72 | + } |
| 73 | + body, err = oj.Marshal(n) |
| 74 | + ctx.Response().SetBody(body) |
| 75 | + return nil |
| 76 | +} |
| 77 | + |
| 78 | +func NewHeaderWhiteFilter(keys []string) (IFilter, error) { |
| 79 | + return &HeaderWhiteFilter{keys: removeDuplicateStrings(keys)}, nil |
| 80 | +} |
| 81 | + |
| 82 | +type HeaderWhiteFilter struct { |
| 83 | + keys []string |
| 84 | +} |
| 85 | + |
| 86 | +func (h *HeaderWhiteFilter) Filter(ctx http_service.IHttpContext) error { |
| 87 | + header := ctx.Response().Headers() |
| 88 | + ctx.Response().HeaderReset() |
| 89 | + for _, key := range h.keys { |
| 90 | + if value := header.Get(key); value != "" { |
| 91 | + ctx.Response().SetHeader(key, value) |
| 92 | + } |
| 93 | + } |
| 94 | + return nil |
| 95 | +} |
| 96 | + |
| 97 | +func NewHeaderBlackFilter(keys []string) (IFilter, error) { |
| 98 | + return &HeaderBlackFilter{keys: removeDuplicateStrings(keys)}, nil |
| 99 | +} |
| 100 | + |
| 101 | +type HeaderBlackFilter struct { |
| 102 | + keys []string |
| 103 | +} |
| 104 | + |
| 105 | +func (h *HeaderBlackFilter) Filter(ctx http_service.IHttpContext) error { |
| 106 | + for _, key := range h.keys { |
| 107 | + ctx.Response().DelHeader(key) |
| 108 | + } |
| 109 | + return nil |
| 110 | +} |
| 111 | + |
| 112 | +func newExprSlice(rules []string) ([]jp.Expr, error) { |
| 113 | + es := make([]jp.Expr, 0, len(rules)) |
| 114 | + for _, filter := range rules { |
| 115 | + key := filter |
| 116 | + if !strings.HasPrefix(key, "$.") { |
| 117 | + key = "$." + key |
| 118 | + } |
| 119 | + expr, err := jp.ParseString(filter) |
| 120 | + if err != nil { |
| 121 | + return nil, err |
| 122 | + } |
| 123 | + es = append(es, expr) |
| 124 | + } |
| 125 | + return es, nil |
| 126 | +} |
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