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Refactor attribute and authorization filters
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,3 @@ | ||
| # REST | ||
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| help build a rest api easily |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,123 @@ | ||
| package api | ||
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| import ( | ||
| "context" | ||
| "net/http" | ||
| "strings" | ||
| ) | ||
|
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| type AttrbuteResource struct { | ||
| Resource string `json:"resource,omitempty"` | ||
| Name string `json:"name,omitempty"` | ||
| } | ||
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| type Attributes struct { | ||
| Action string `json:"action,omitempty"` | ||
| Resources []AttrbuteResource `json:"resources,omitempty"` | ||
| Path string `json:"path,omitempty"` | ||
| } | ||
|
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| type AttributeExtractor func(r *http.Request) (*Attributes, error) | ||
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| func PrefixedAttributesExtractor(prefix string) AttributeExtractor { | ||
| return func(r *http.Request) (*Attributes, error) { | ||
| if !strings.HasPrefix(r.URL.Path, prefix) { | ||
| return nil, nil | ||
| } | ||
| method, path := r.Method, strings.TrimPrefix(r.URL.Path, prefix) | ||
| action, resources := DefaultRestAttributeExtractor(method, path) | ||
| return &Attributes{Action: action, Resources: resources, Path: path}, nil | ||
| } | ||
| } | ||
|
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| // plural | ||
| var MethodActionMapPlural = map[string]string{ | ||
| "GET": "list", | ||
| "POST": "create", | ||
| "DELETE": "removeBatch", | ||
| } | ||
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| // singular plural | ||
| var MethodActionMapSingular = map[string]string{ | ||
| "GET": "get", | ||
| "PUT": "update", | ||
| "DELETE": "remove", | ||
| "PATCH": "patch", | ||
| } | ||
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| func DefaultRestAttributeExtractor(method string, path string) (string, []AttrbuteResource) { | ||
| // example: | ||
| // /api/v1/namespaces/default/pods/nginx-xxx -> ["namespaces", "default", "pods", "nginx-xxx"] | ||
| // /api/v1/namespaces/default/pods -> ["namespaces", "default", "pods"] | ||
| // /api/v1/namespaces/default -> ["namespaces", "default"] | ||
| // /api/v1/namespaces -> ["namespaces"] | ||
| // /api/v1 -> [] | ||
| resource, action := splitResourceAction(path) | ||
| parts := removeEmpty(strings.Split(resource, "/")) | ||
| if len(parts) == 0 { | ||
| return action, nil | ||
| } | ||
| // if odd, it's a list request, e.g. GET /api/v1/namespaces/default/pods | ||
| if len(parts)%2 != 0 { | ||
| parts = append(parts, "") | ||
| if action == "" { | ||
| action = string(MethodActionMapPlural[method]) | ||
| } | ||
| } else { | ||
| if action == "" { | ||
| action = string(MethodActionMapSingular[method]) | ||
| } | ||
| } | ||
| resources := []AttrbuteResource{} | ||
| for i := 0; i < len(parts); i += 2 { | ||
| resources = append(resources, AttrbuteResource{Resource: parts[i], Name: parts[i+1]}) | ||
| } | ||
| return action, resources | ||
| } | ||
|
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| func removeEmpty(arr []string) []string { | ||
| w := 0 | ||
| for _, v := range arr { | ||
| if v != "" { | ||
| arr[w] = v | ||
| w++ | ||
| } | ||
| } | ||
| return arr[:w] | ||
| } | ||
|
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| // e.g. /zoos/{id}/animals/{name}:feed -> /zoos/{id}/animals/{name},feed | ||
| func splitResourceAction(path string) (string, string) { | ||
| if i := strings.LastIndex(path, ":"); i < 0 { | ||
| return path, "" | ||
| } else { | ||
| return path[:i], path[i+1:] | ||
| } | ||
| } | ||
|
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| func NewAttributeFilter(attributer AttributeExtractor) Filter { | ||
| return FilterFunc(func(w http.ResponseWriter, r *http.Request, next http.Handler) { | ||
| attributes, err := attributer(r) | ||
| if err != nil { | ||
| http.Error(w, err.Error(), http.StatusInternalServerError) | ||
| return | ||
| } | ||
| ctx := WithAttributes(r.Context(), attributes) | ||
| next.ServeHTTP(w, r.WithContext(ctx)) | ||
| }) | ||
| } | ||
|
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| type attributesContext struct{} | ||
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| var attributesContextKey = &attributesContext{} | ||
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| func WithAttributes(ctx context.Context, attributes *Attributes) context.Context { | ||
| return context.WithValue(ctx, attributesContextKey, attributes) | ||
| } | ||
|
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| func AttributesFromContext(ctx context.Context) *Attributes { | ||
| if attributes, ok := ctx.Value(attributesContextKey).(*Attributes); ok { | ||
| return attributes | ||
| } | ||
| return nil | ||
| } |
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