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| 1 | +package authorizer |
| 2 | + |
| 3 | +import ( |
| 4 | + "bytes" |
| 5 | + "text/template" |
| 6 | + |
| 7 | + authorizationapi "github.com/openshift/origin/pkg/authorization/api" |
| 8 | +) |
| 9 | + |
| 10 | +const DefaultProjectRequestForbidden = "You may not request a new project via this API." |
| 11 | + |
| 12 | +type ForbiddenMessageResolver struct { |
| 13 | + // TODO if these maps were map[string]map[util.StringSet]ForbiddenMessageMaker, we'd be able to handle cases where sets of resources wanted slightly different messages |
| 14 | + // unfortunately, maps don't support keys like that, requiring StringSet serialization and deserialization. |
| 15 | + namespacedVerbsToResourcesToForbiddenMessageMaker map[string]map[string]ForbiddenMessageMaker |
| 16 | + rootScopedVerbsToResourcesToForbiddenMessageMaker map[string]map[string]ForbiddenMessageMaker |
| 17 | + |
| 18 | + nonResourceURLForbiddenMessageMaker ForbiddenMessageMaker |
| 19 | + defaultForbiddenMessageMaker ForbiddenMessageMaker |
| 20 | +} |
| 21 | + |
| 22 | +func NewForbiddenMessageResolver(projectRequestForbiddenTemplate string) *ForbiddenMessageResolver { |
| 23 | + messageResolver := &ForbiddenMessageResolver{ |
| 24 | + namespacedVerbsToResourcesToForbiddenMessageMaker: map[string]map[string]ForbiddenMessageMaker{}, |
| 25 | + rootScopedVerbsToResourcesToForbiddenMessageMaker: map[string]map[string]ForbiddenMessageMaker{}, |
| 26 | + nonResourceURLForbiddenMessageMaker: newTemplateForbiddenMessageMaker(`User "{{.User.GetName}}" cannot "{{.Attributes.GetVerb}}" on "{{.Attributes.GetURL}}"`), |
| 27 | + defaultForbiddenMessageMaker: newTemplateForbiddenMessageMaker(`User "{{.User.GetName}}" cannot "{{.Attributes.GetVerb}}" "{{.Attributes.GetResource}}" with name "{{.Attributes.GetResourceName}}" in project "{{.Namespace}}"`), |
| 28 | + } |
| 29 | + |
| 30 | + // general messages |
| 31 | + messageResolver.addNamespacedForbiddenMessageMaker("create", authorizationapi.ResourceAll, newTemplateForbiddenMessageMaker(`User "{{.User.GetName}}" cannot create {{.Attributes.GetResource}} in project "{{.Namespace}}"`)) |
| 32 | + messageResolver.addRootScopedForbiddenMessageMaker("create", authorizationapi.ResourceAll, newTemplateForbiddenMessageMaker(`User "{{.User.GetName}}" cannot create {{.Attributes.GetResource}} at the cluster scope`)) |
| 33 | + messageResolver.addNamespacedForbiddenMessageMaker("get", authorizationapi.ResourceAll, newTemplateForbiddenMessageMaker(`User "{{.User.GetName}}" cannot get {{.Attributes.GetResource}} in project "{{.Namespace}}"`)) |
| 34 | + messageResolver.addRootScopedForbiddenMessageMaker("get", authorizationapi.ResourceAll, newTemplateForbiddenMessageMaker(`User "{{.User.GetName}}" cannot get {{.Attributes.GetResource}} at the cluster scope`)) |
| 35 | + messageResolver.addNamespacedForbiddenMessageMaker("list", authorizationapi.ResourceAll, newTemplateForbiddenMessageMaker(`User "{{.User.GetName}}" cannot list {{.Attributes.GetResource}} in project "{{.Namespace}}"`)) |
| 36 | + messageResolver.addRootScopedForbiddenMessageMaker("list", authorizationapi.ResourceAll, newTemplateForbiddenMessageMaker(`User "{{.User.GetName}}" cannot list all {{.Attributes.GetResource}} in the cluster`)) |
| 37 | + messageResolver.addNamespacedForbiddenMessageMaker("update", authorizationapi.ResourceAll, newTemplateForbiddenMessageMaker(`User "{{.User.GetName}}" cannot update {{.Attributes.GetResource}} in project "{{.Namespace}}"`)) |
| 38 | + messageResolver.addRootScopedForbiddenMessageMaker("update", authorizationapi.ResourceAll, newTemplateForbiddenMessageMaker(`User "{{.User.GetName}}" cannot update {{.Attributes.GetResource}} at the cluster scope`)) |
| 39 | + messageResolver.addNamespacedForbiddenMessageMaker("delete", authorizationapi.ResourceAll, newTemplateForbiddenMessageMaker(`User "{{.User.GetName}}" cannot delete {{.Attributes.GetResource}} in project "{{.Namespace}}"`)) |
| 40 | + messageResolver.addRootScopedForbiddenMessageMaker("delete", authorizationapi.ResourceAll, newTemplateForbiddenMessageMaker(`User "{{.User.GetName}}" cannot delete {{.Attributes.GetResource}} at the cluster scope`)) |
| 41 | + |
| 42 | + // project request rejection |
| 43 | + projectRequestDeny := projectRequestForbiddenTemplate |
| 44 | + if len(projectRequestDeny) == 0 { |
| 45 | + projectRequestDeny = DefaultProjectRequestForbidden |
| 46 | + } |
| 47 | + messageResolver.addRootScopedForbiddenMessageMaker("create", "projectrequests", newTemplateForbiddenMessageMaker(projectRequestDeny)) |
| 48 | + |
| 49 | + return messageResolver |
| 50 | +} |
| 51 | + |
| 52 | +func (m *ForbiddenMessageResolver) addNamespacedForbiddenMessageMaker(verb, resource string, messageMaker ForbiddenMessageMaker) { |
| 53 | + m.addForbiddenMessageMaker(m.namespacedVerbsToResourcesToForbiddenMessageMaker, verb, resource, messageMaker) |
| 54 | +} |
| 55 | + |
| 56 | +func (m *ForbiddenMessageResolver) addRootScopedForbiddenMessageMaker(verb, resource string, messageMaker ForbiddenMessageMaker) { |
| 57 | + m.addForbiddenMessageMaker(m.rootScopedVerbsToResourcesToForbiddenMessageMaker, verb, resource, messageMaker) |
| 58 | +} |
| 59 | + |
| 60 | +func (m *ForbiddenMessageResolver) addForbiddenMessageMaker(target map[string]map[string]ForbiddenMessageMaker, verb, resource string, messageMaker ForbiddenMessageMaker) { |
| 61 | + resourcesToForbiddenMessageMaker, exists := target[verb] |
| 62 | + if !exists { |
| 63 | + resourcesToForbiddenMessageMaker = map[string]ForbiddenMessageMaker{} |
| 64 | + target[verb] = resourcesToForbiddenMessageMaker |
| 65 | + } |
| 66 | + |
| 67 | + resourcesToForbiddenMessageMaker[resource] = messageMaker |
| 68 | +} |
| 69 | + |
| 70 | +func (m *ForbiddenMessageResolver) MakeMessage(ctx MessageContext) (string, error) { |
| 71 | + if ctx.Attributes.IsNonResourceURL() { |
| 72 | + return m.nonResourceURLForbiddenMessageMaker.MakeMessage(ctx) |
| 73 | + } |
| 74 | + |
| 75 | + messageMakerMap := m.namespacedVerbsToResourcesToForbiddenMessageMaker |
| 76 | + if len(ctx.Namespace) == 0 { |
| 77 | + messageMakerMap = m.rootScopedVerbsToResourcesToForbiddenMessageMaker |
| 78 | + } |
| 79 | + |
| 80 | + resourcesToForbiddenMessageMaker, exists := messageMakerMap[ctx.Attributes.GetVerb()] |
| 81 | + if !exists { |
| 82 | + resourcesToForbiddenMessageMaker, exists = messageMakerMap[authorizationapi.VerbAll] |
| 83 | + if !exists { |
| 84 | + return m.defaultForbiddenMessageMaker.MakeMessage(ctx) |
| 85 | + } |
| 86 | + } |
| 87 | + |
| 88 | + messageMaker, exists := resourcesToForbiddenMessageMaker[ctx.Attributes.GetResource()] |
| 89 | + if !exists { |
| 90 | + messageMaker, exists = resourcesToForbiddenMessageMaker[authorizationapi.ResourceAll] |
| 91 | + if !exists { |
| 92 | + return m.defaultForbiddenMessageMaker.MakeMessage(ctx) |
| 93 | + } |
| 94 | + } |
| 95 | + |
| 96 | + specificMessage, err := messageMaker.MakeMessage(ctx) |
| 97 | + if err != nil { |
| 98 | + return m.defaultForbiddenMessageMaker.MakeMessage(ctx) |
| 99 | + } |
| 100 | + |
| 101 | + return specificMessage, nil |
| 102 | +} |
| 103 | + |
| 104 | +type templateForbiddenMessageMaker struct { |
| 105 | + parsedTemplate *template.Template |
| 106 | +} |
| 107 | + |
| 108 | +func newTemplateForbiddenMessageMaker(text string) templateForbiddenMessageMaker { |
| 109 | + parsedTemplate, err := template.New("").Parse(text) |
| 110 | + if err != nil { |
| 111 | + // this is an internal method called with static strings, we should never panic |
| 112 | + panic(err.Error()) |
| 113 | + } |
| 114 | + |
| 115 | + return templateForbiddenMessageMaker{parsedTemplate} |
| 116 | +} |
| 117 | + |
| 118 | +func (m templateForbiddenMessageMaker) MakeMessage(ctx MessageContext) (string, error) { |
| 119 | + buffer := &bytes.Buffer{} |
| 120 | + err := m.parsedTemplate.Execute(buffer, ctx) |
| 121 | + return string(buffer.Bytes()), err |
| 122 | +} |
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