woodpecker/server/web/template.go

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// Copyright 2018 Drone.IO Inc.
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//
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// 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
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// 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.
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package web
import (
"bytes"
"encoding/json"
"fmt"
"html/template"
"strings"
"golang.org/x/net/html"
)
// default func map with json parser.
var funcMap = template.FuncMap{
"json": func(v interface{}) template.JS {
a, _ := json.Marshal(v)
return template.JS(a)
},
}
// helper function creates a new template from the text string.
func mustCreateTemplate(text string) *template.Template {
templ, err := createTemplate(text)
if err != nil {
panic(err)
}
return templ
}
// helper function creates a new template from the text string.
func createTemplate(text string) (*template.Template, error) {
templ, err := template.New("_").Funcs(funcMap).Parse(partials)
if err != nil {
return nil, err
}
return templ.Parse(
injectPartials(text),
)
}
// helper function that parses the html file and injects
// named partial templates.
func injectPartials(s string) string {
w := new(bytes.Buffer)
r := bytes.NewBufferString(s)
t := html.NewTokenizer(r)
for {
tt := t.Next()
if tt == html.ErrorToken {
break
}
if tt == html.CommentToken {
txt := string(t.Text())
txt = strings.TrimSpace(txt)
seg := strings.Split(txt, ":")
if len(seg) == 2 && seg[0] == "drone" {
fmt.Fprintf(w, "{{ template %q . }}", seg[1])
continue
}
}
w.Write(t.Raw())
}
return w.String()
}
const partials = `
{{define "user"}}
{{ if .user }}
<script>
window.DRONE_USER = {{ json .user }};
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window.DRONE_SYNC = {{ .syncing }};
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</script>
{{ end }}
{{end}}
{{define "csrf"}}
{{ if .csrf -}}
<script>
window.DRONE_CSRF = "{{ .csrf }}"
</script>
{{- end }}
{{end}}
{{define "version"}}
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<script>
window.DRONE_VERSION = {{ .version }};
</script>
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<meta name="version" content="{{ .version }}">
{{end}}
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{{define "docs"}}
{{ if .docs -}}
<script>
window.DRONE_DOCS = "{{ .docs }}"
</script>
{{- end }}
{{end}}
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`