104 lines
2.8 KiB
Go
104 lines
2.8 KiB
Go
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// Copyright © 2019 Peter Kurfer peter.kurfer@googlemail.com
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// 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
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package template
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import (
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"fmt"
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"github.com/baez90/go-reveal-slides/internal/app/config"
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"github.com/gobuffalo/packr/v2"
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"html/template"
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"io/ioutil"
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"net/http"
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"os"
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"path"
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log "github.com/sirupsen/logrus"
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)
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type RevealRenderer interface {
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http.Handler
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init() error
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}
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func NewRevealRenderer(markdownPath string, params *config.RevealParams) (renderer RevealRenderer, err error) {
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var info os.FileInfo
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info, err = os.Stat(markdownPath)
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if err != nil {
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return
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}
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if info.IsDir() || path.Ext(info.Name()) != ".md" {
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err = fmt.Errorf("path %s did not pass sanity checks for markdown files", markdownPath)
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return
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}
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renderer = &revealRenderer{
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markdownPath: markdownPath,
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params: params,
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}
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err = renderer.init()
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return
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}
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type revealRenderer struct {
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markdownPath string
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template *template.Template
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renderedTemplate string
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params *config.RevealParams
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}
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func (renderer *revealRenderer) init() (err error) {
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templateBox := packr.New("template", "./../../../assets/template")
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templateString, err := templateBox.FindString("reveal-markdown.tmpl")
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if err != nil {
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return
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}
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renderer.template, err = template.New("index").Parse(templateString)
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return
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}
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func (renderer *revealRenderer) ServeHTTP(response http.ResponseWriter, request *http.Request) {
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if renderer.template == nil {
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writeErrorResponse(500, "template is not set - probably error during startup", response)
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return
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}
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markdownContent, err := ioutil.ReadFile(renderer.markdownPath)
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if err != nil {
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writeErrorResponse(500, "failed to read markdown content", response)
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log.Errorf("Failed to read markdown content: %v", err)
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return
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}
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err = renderer.template.Execute(response, struct {
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Reveal config.RevealParams
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MarkdownBody string
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}{Reveal: *renderer.params, MarkdownBody: string(markdownContent)})
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if err != nil {
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writeErrorResponse(500, "Failed to render Markdown to template", response)
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log.Errorf("Failed to render Markdown template: %v", err)
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}
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}
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func writeErrorResponse(code int, msg string, response http.ResponseWriter) {
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response.WriteHeader(code)
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_, err := response.Write([]byte(msg))
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log.Errorf("Failed to write error reponse: %v", err)
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}
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