| // Copyright Istio Authors |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package matcher |
| |
| import ( |
| "strings" |
| ) |
| |
| import ( |
| matcherpb "github.com/envoyproxy/go-control-plane/envoy/type/matcher/v3" |
| ) |
| |
| // StringMatcher creates a string matcher for v. |
| func StringMatcher(v string) *matcherpb.StringMatcher { |
| return StringMatcherWithPrefix(v, "") |
| } |
| |
| // StringMatcherRegex creates a regex string matcher for regex. |
| func StringMatcherRegex(regex string) *matcherpb.StringMatcher { |
| return &matcherpb.StringMatcher{ |
| MatchPattern: &matcherpb.StringMatcher_SafeRegex{ |
| SafeRegex: &matcherpb.RegexMatcher{ |
| EngineType: &matcherpb.RegexMatcher_GoogleRe2{ |
| GoogleRe2: &matcherpb.RegexMatcher_GoogleRE2{}, |
| }, |
| Regex: regex, |
| }, |
| }, |
| } |
| } |
| |
| // StringMatcherWithPrefix creates a string matcher for v with the extra prefix inserted to the |
| // created string matcher, note the prefix is ignored if v is wildcard ("*"). |
| // The wildcard "*" will be generated as ".+" instead of ".*". |
| func StringMatcherWithPrefix(v, prefix string) *matcherpb.StringMatcher { |
| switch { |
| // Check if v is "*" first to make sure we won't generate an empty prefix/suffix StringMatcher, |
| // the Envoy StringMatcher doesn't allow empty prefix/suffix. |
| case v == "*": |
| return StringMatcherRegex(".+") |
| case strings.HasPrefix(v, "*"): |
| if prefix == "" { |
| return &matcherpb.StringMatcher{ |
| MatchPattern: &matcherpb.StringMatcher_Suffix{ |
| Suffix: strings.TrimPrefix(v, "*"), |
| }, |
| } |
| } |
| return StringMatcherRegex(prefix + ".*" + strings.TrimPrefix(v, "*")) |
| case strings.HasSuffix(v, "*"): |
| return &matcherpb.StringMatcher{ |
| MatchPattern: &matcherpb.StringMatcher_Prefix{ |
| Prefix: prefix + strings.TrimSuffix(v, "*"), |
| }, |
| } |
| default: |
| return &matcherpb.StringMatcher{ |
| MatchPattern: &matcherpb.StringMatcher_Exact{ |
| Exact: prefix + v, |
| }, |
| } |
| } |
| } |