c9c0475f4d
* In Render tolerate not being passed a context It is possible for RenderString to be passed to an external renderer if markdown is set to be rendered by an external renderer. No context is currently sent to these meaning that this will error out. Fix #16835 Signed-off-by: Andrew Thornton <art27@cantab.net> * Add Context to Repo calls for RenderString All calls from routers can easily add the context - so add it. Signed-off-by: Andrew Thornton <art27@cantab.net>
132 lines
3.6 KiB
Go
132 lines
3.6 KiB
Go
// Copyright 2017 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package external
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import (
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"context"
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"os/exec"
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"runtime"
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"strings"
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"code.gitea.io/gitea/modules/graceful"
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"code.gitea.io/gitea/modules/log"
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"code.gitea.io/gitea/modules/markup"
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"code.gitea.io/gitea/modules/process"
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"code.gitea.io/gitea/modules/setting"
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"code.gitea.io/gitea/modules/util"
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)
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// RegisterRenderers registers all supported third part renderers according settings
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func RegisterRenderers() {
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for _, renderer := range setting.ExternalMarkupRenderers {
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if renderer.Enabled && renderer.Command != "" && len(renderer.FileExtensions) > 0 {
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markup.RegisterRenderer(&Renderer{renderer})
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}
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}
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}
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// Renderer implements markup.Renderer for external tools
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type Renderer struct {
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*setting.MarkupRenderer
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}
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// Name returns the external tool name
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func (p *Renderer) Name() string {
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return p.MarkupName
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}
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// NeedPostProcess implements markup.Renderer
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func (p *Renderer) NeedPostProcess() bool {
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return p.MarkupRenderer.NeedPostProcess
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}
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// Extensions returns the supported extensions of the tool
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func (p *Renderer) Extensions() []string {
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return p.FileExtensions
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}
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// SanitizerRules implements markup.Renderer
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func (p *Renderer) SanitizerRules() []setting.MarkupSanitizerRule {
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return p.MarkupSanitizerRules
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}
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func envMark(envName string) string {
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if runtime.GOOS == "windows" {
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return "%" + envName + "%"
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}
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return "$" + envName
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}
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// Render renders the data of the document to HTML via the external tool.
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func (p *Renderer) Render(ctx *markup.RenderContext, input io.Reader, output io.Writer) error {
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var (
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urlRawPrefix = strings.Replace(ctx.URLPrefix, "/src/", "/raw/", 1)
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command = strings.NewReplacer(envMark("GITEA_PREFIX_SRC"), ctx.URLPrefix,
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envMark("GITEA_PREFIX_RAW"), urlRawPrefix).Replace(p.Command)
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commands = strings.Fields(command)
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args = commands[1:]
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)
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if p.IsInputFile {
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// write to temp file
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f, err := ioutil.TempFile("", "gitea_input")
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if err != nil {
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return fmt.Errorf("%s create temp file when rendering %s failed: %v", p.Name(), p.Command, err)
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}
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tmpPath := f.Name()
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defer func() {
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if err := util.Remove(tmpPath); err != nil {
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log.Warn("Unable to remove temporary file: %s: Error: %v", tmpPath, err)
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}
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}()
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_, err = io.Copy(f, input)
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if err != nil {
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f.Close()
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return fmt.Errorf("%s write data to temp file when rendering %s failed: %v", p.Name(), p.Command, err)
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}
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err = f.Close()
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if err != nil {
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return fmt.Errorf("%s close temp file when rendering %s failed: %v", p.Name(), p.Command, err)
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}
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args = append(args, f.Name())
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}
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if ctx == nil || ctx.Ctx == nil {
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if ctx == nil {
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log.Warn("RenderContext not provided defaulting to empty ctx")
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ctx = &markup.RenderContext{}
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}
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log.Warn("RenderContext did not provide context, defaulting to Shutdown context")
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ctx.Ctx = graceful.GetManager().ShutdownContext()
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}
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processCtx, cancel := context.WithCancel(ctx.Ctx)
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defer cancel()
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pid := process.GetManager().Add(fmt.Sprintf("Render [%s] for %s", commands[0], ctx.URLPrefix), cancel)
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defer process.GetManager().Remove(pid)
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cmd := exec.CommandContext(processCtx, commands[0], args...)
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cmd.Env = append(
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os.Environ(),
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"GITEA_PREFIX_SRC="+ctx.URLPrefix,
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"GITEA_PREFIX_RAW="+urlRawPrefix,
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)
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if !p.IsInputFile {
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cmd.Stdin = input
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}
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cmd.Stdout = output
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if err := cmd.Run(); err != nil {
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return fmt.Errorf("%s render run command %s %v failed: %v", p.Name(), commands[0], args, err)
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}
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return nil
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}
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