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Implement policy-level tag regex filtering
Tag regex filtering allows the user to filter tags based on a regular expression pattern and enables tag version extraction through capture group replacement reference. Fixes #73 Signed-off-by: Aurel Canciu <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,70 @@ | ||
| /* | ||
| Copyright 2021 The Flux 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 policy | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "regexp" | ||
| ) | ||
|
|
||
| // RegexFilter represents a regular expression filter | ||
| type RegexFilter struct { | ||
| filtered map[string]string | ||
|
|
||
| Regexp *regexp.Regexp | ||
| Replace string | ||
| } | ||
|
|
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| // NewRegexFilter constructs new RegexFilter object | ||
| func NewRegexFilter(pattern string, replace string) (*RegexFilter, error) { | ||
| m, err := regexp.Compile(pattern) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("invalid regular expression pattern '%s': %w", pattern, err) | ||
| } | ||
| return &RegexFilter{ | ||
| Regexp: m, | ||
| Replace: replace, | ||
| }, nil | ||
| } | ||
|
|
||
| // Apply will construct the filtered list of tags based on the provided list of tags | ||
| func (f *RegexFilter) Apply(list []string) { | ||
| f.filtered = map[string]string{} | ||
| for _, item := range list { | ||
| if f.Regexp.MatchString(item) { | ||
| tag := item | ||
| if f.Replace != "" { | ||
| tag = f.Regexp.ReplaceAllString(item, f.Replace) | ||
| } | ||
| f.filtered[tag] = item | ||
| } | ||
| } | ||
| } | ||
|
|
||
| // Items returns the list of filtered tags | ||
| func (f *RegexFilter) Items() []string { | ||
| var filtered []string | ||
| for k := range f.filtered { | ||
| filtered = append(filtered, k) | ||
| } | ||
| return filtered | ||
| } | ||
|
|
||
| // GetOriginalTag returns the original tag before replace extraction | ||
| func (f *RegexFilter) GetOriginalTag(tag string) string { | ||
| return f.filtered[tag] | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,67 @@ | ||
| /* | ||
| Copyright 2021 The Flux 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 policy | ||
|
|
||
| import ( | ||
| "reflect" | ||
| "sort" | ||
| "testing" | ||
| ) | ||
|
|
||
| func TestRegexFilter(t *testing.T) { | ||
| cases := []struct { | ||
| label string | ||
| tags []string | ||
| pattern string | ||
| extract string | ||
| expected []string | ||
| }{ | ||
| { | ||
| label: "none", | ||
| tags: []string{"a"}, | ||
| expected: []string{"a"}, | ||
| }, | ||
| { | ||
| label: "valid pattern", | ||
| tags: []string{"ver1", "ver2", "ver3", "rel1"}, | ||
| pattern: "^ver", | ||
| expected: []string{"ver1", "ver2", "ver3"}, | ||
| }, | ||
| { | ||
| label: "valid pattern with capture group", | ||
| tags: []string{"ver1", "ver2", "ver3", "rel1"}, | ||
| pattern: `ver(\d+)`, | ||
| extract: `$1`, | ||
| expected: []string{"1", "2", "3"}, | ||
| }, | ||
| } | ||
| for _, tt := range cases { | ||
| t.Run(tt.label, func(t *testing.T) { | ||
| filter := newRegexFilter(tt.pattern, tt.extract) | ||
| filter.Apply(tt.tags) | ||
| r := sort.StringSlice(filter.Items()) | ||
| if reflect.DeepEqual(r, tt.expected) { | ||
| t.Errorf("incorrect value returned, got '%s', expected '%s'", r, tt.expected) | ||
| } | ||
| }) | ||
| } | ||
| } | ||
|
|
||
| func newRegexFilter(pattern string, extract string) *RegexFilter { | ||
| f, _ := NewRegexFilter(pattern, extract) | ||
| return f | ||
| } |
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