tokenserver: Extract rules check into a separate function.

tokenserver/api/admin/v1/admin.pb.go

 // Code generated by protoc-gen-go. DO NOT EDIT.
 // source: github.com/luci/luci-go/tokenserver/api/admin/v1/admin.proto
 
 /*
 Package admin is a generated protocol buffer package.
 
 It is generated from these files:
         github.com/luci/luci-go/tokenserver/api/admin/v1/admin.proto
         github.com/luci/luci-go/tokenserver/api/admin/v1/certificate_authorities.proto
         github.com/luci/luci-go/tokenserver/api/admin/v1/config.proto
@@ skipping 409 matching lines @@
         if m != nil {
                 return m.Token
         }
         return ""
 }
 
 // InspectOAuthTokenGrantResponse is return value of InspectOAuthTokenGrant RPC.
 type InspectOAuthTokenGrantResponse struct {
         // True if the token is valid.
         //
-        // A token is valid if its signature is correct and it hasn't expired yet.
+        // A token is valid if its signature is correct, it hasn't expired yet and
+        // token server rules still allow it.
         Valid bool `protobuf:"varint,1,opt,name=valid" json:"valid,omitempty"`
         // Human readable summary of why token is invalid.
         //
         // Summarizes the rest of the fields of this struct. Set only if 'valid' is
         // false.
         InvalidityReason string `protobuf:"bytes,2,opt,name=invalidity_reason,json=invalidityReason" json:"invalidity_reason,omitempty"`
         // True if the token signature was verified.
         //
         // It means the token was generated by the token server and its body is not
         // a garbage. Note that a token can be correctly signed, but invalid (if it
@@ skipping 11 matching lines @@
         // True if the token signature was verified and token hasn't expired yet.
         //
         // We use "non_" prefix to make default 'false' value safer.
         NonExpired bool `protobuf:"varint,4,opt,name=non_expired,json=nonExpired" json:"non_expired,omitempty"`
         // ID of a token server private key used to sign the token.
         SigningKeyId string `protobuf:"bytes,5,opt,name=signing_key_id,json=signingKeyId" json:"signing_key_id,omitempty"`
         // The deserialized token body.
         //
         // May be empty if token was malformed and couldn't be deserialized.
         TokenBody *tokenserver1.OAuthTokenGrantBody `protobuf:"bytes,6,opt,name=token_body,json=tokenBody" json:"token_body,omitempty"`
+        // The service_accounts.cfg rule that governs the service account usage.
+        //
+        // May be present even if the token is not allowed by it.
+        MatchingRule *ServiceAccountRule `protobuf:"bytes,7,opt,name=matching_rule,json=matchingRule" json:"matching_rule,omitempty"`
+        // True if current service_accounts.cfg rules allow this token.
+        AllowedByRules bool `protobuf:"varint,8,opt,name=allowed_by_rules,json=allowedByRules" json:"allowed_by_rules,omitempty"`
 }
 
 func (m *InspectOAuthTokenGrantResponse) Reset()                    { *m = InspectOAuthTokenGrantResponse{} }
 func (m *InspectOAuthTokenGrantResponse) String() string            { return proto.CompactTextString(m) }
 func (*InspectOAuthTokenGrantResponse) ProtoMessage()               {}
 func (*InspectOAuthTokenGrantResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{6} }
 
 func (m *InspectOAuthTokenGrantResponse) GetValid() bool {
         if m != nil {
                 return m.Valid
@@ skipping 29 matching lines @@
         return ""
 }
 
 func (m *InspectOAuthTokenGrantResponse) GetTokenBody() *tokenserver1.OAuthTokenGrantBody {
         if m != nil {
                 return m.TokenBody
         }
         return nil
 }
 
+func (m *InspectOAuthTokenGrantResponse) GetMatchingRule() *ServiceAccountRule {
+        if m != nil {
+                return m.MatchingRule
+        }
+        return nil
+}
+
+func (m *InspectOAuthTokenGrantResponse) GetAllowedByRules() bool {
+        if m != nil {
+                return m.AllowedByRules
+        }
+        return false
+}
+
 func init() {
         proto.RegisterType((*ImportedConfigs)(nil), "tokenserver.admin.ImportedConfigs")
         proto.RegisterType((*InspectMachineTokenRequest)(nil), "tokenserver.admin.InspectMachineTokenRequest")
         proto.RegisterType((*InspectMachineTokenResponse)(nil), "tokenserver.admin.InspectMachineTokenResponse")
         proto.RegisterType((*InspectDelegationTokenRequest)(nil), "tokenserver.admin.InspectDelegationTokenRequest")
         proto.RegisterType((*InspectDelegationTokenResponse)(nil), "tokenserver.admin.InspectDelegationTokenResponse")
         proto.RegisterType((*InspectOAuthTokenGrantRequest)(nil), "tokenserver.admin.InspectOAuthTokenGrantRequest")
         proto.RegisterType((*InspectOAuthTokenGrantResponse)(nil), "tokenserver.admin.InspectOAuthTokenGrantResponse")
 }
 
@@ skipping 389 matching lines @@
         },
         Streams:  []grpc.StreamDesc{},
         Metadata: "github.com/luci/luci-go/tokenserver/api/admin/v1/admin.proto",
 }
 
 func init() {
         proto.RegisterFile("github.com/luci/luci-go/tokenserver/api/admin/v1/admin.proto", fileDescriptor0)
 }
 
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