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Use Sprig template functions and add asLabelValue function
Fixes #2033
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,77 @@ | ||
| /* | ||
| Copyright 2025 The Kubernetes 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 utils | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "fmt" | ||
| "strings" | ||
| "text/template" | ||
|
|
||
| "github.com/Masterminds/sprig/v3" | ||
| ) | ||
|
|
||
| type TemplateHelper struct { | ||
| template *template.Template | ||
| } | ||
|
|
||
| func NewTemplateHelper(name string) (*TemplateHelper, error) { | ||
| tmpl := template.New("").Funcs(sprig.FuncMap()).Option("missingkey=error") | ||
| tmpl = tmpl.Funcs(template.FuncMap{ | ||
| "asLabelValue": func(s string) string { | ||
| // Replace spaces and periods with dashes | ||
| return strings.ReplaceAll(strings.ReplaceAll(s, " ", "-"), ".", "-") | ||
| }, | ||
| }) | ||
| tmpl, err := tmpl.Parse(name) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("invalid template: %w", err) | ||
| } | ||
| return &TemplateHelper{template: tmpl}, nil | ||
| } | ||
|
|
||
| func (h *TemplateHelper) execute(data interface{}) (string, error) { | ||
| var tmp bytes.Buffer | ||
| if err := h.template.Execute(&tmp, data); err != nil { | ||
| return "", err | ||
| } | ||
| return tmp.String(), nil | ||
| } | ||
|
|
||
| // ExpandMap is a helper for expanding a template in to a map of strings. Data | ||
| // after executing the template is expected to be key=value pairs separated by | ||
| // newlines. | ||
| func (h *TemplateHelper) ExpandMap(data interface{}) (map[string]string, error) { | ||
| expanded, err := h.execute(data) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| // Split out individual key-value pairs | ||
| out := make(map[string]string) | ||
| for _, item := range strings.Split(expanded, "\n") { | ||
| // Remove leading/trailing whitespace and skip empty lines | ||
| if trimmed := strings.TrimSpace(item); trimmed != "" { | ||
| split := strings.SplitN(trimmed, "=", 2) | ||
| if len(split) == 1 { | ||
| return nil, fmt.Errorf("missing value in expanded template line %q, (format must be '<key>=<value>')", trimmed) | ||
| } | ||
| out[split[0]] = split[1] | ||
| } | ||
| } | ||
| return out, nil | ||
| } |