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875b398e5e
Backport #26745
Fixes #26548
This PR refactors the rendering of markup links. The old code uses
`strings.Replace` to change some urls while the new code uses more
context to decide which link should be generated.
The added tests should ensure the same output for the old and new
behaviour (besides the bug).
We may need to refactor the rendering a bit more to make it clear how
the different helper methods render the input string. There are lots of
options (resolve links / images / mentions / git hashes / emojis / ...)
but you don't really know what helper uses which options. For example,
we currently support images in the user description which should not be
allowed I think:
<details>
<summary>Profile</summary>
https://try.gitea.io/KN4CK3R
![grafik](https://github.com/go-gitea/gitea/assets/1666336/109ae422-496d-4200-b52e-b3a528f553e5)
</details>
(cherry picked from commit 022552d5b6
)
146 lines
4 KiB
Go
146 lines
4 KiB
Go
// Copyright 2017 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package external
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import (
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"bytes"
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"fmt"
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"io"
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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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var (
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_ markup.PostProcessRenderer = (*Renderer)(nil)
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_ markup.ExternalRenderer = (*Renderer)(nil)
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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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// SanitizerDisabled disabled sanitize if return true
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func (p *Renderer) SanitizerDisabled() bool {
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return p.RenderContentMode == setting.RenderContentModeNoSanitizer || p.RenderContentMode == setting.RenderContentModeIframe
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}
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// DisplayInIFrame represents whether render the content with an iframe
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func (p *Renderer) DisplayInIFrame() bool {
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return p.RenderContentMode == setting.RenderContentModeIframe
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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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command = strings.NewReplacer(
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envMark("GITEA_PREFIX_SRC"), ctx.Links.SrcLink(),
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envMark("GITEA_PREFIX_RAW"), ctx.Links.RawLink(),
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).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 := os.CreateTemp("", "gitea_input")
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if err != nil {
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return fmt.Errorf("%s create temp file when rendering %s failed: %w", 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: %w", 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: %w", 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, _, finished := process.GetManager().AddContext(ctx.Ctx, fmt.Sprintf("Render [%s] for %s", commands[0], ctx.Links.SrcLink()))
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defer finished()
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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.Links.SrcLink(),
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"GITEA_PREFIX_RAW="+ctx.Links.RawLink(),
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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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var stderr bytes.Buffer
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cmd.Stdout = output
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cmd.Stderr = &stderr
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process.SetSysProcAttribute(cmd)
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if err := cmd.Run(); err != nil {
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return fmt.Errorf("%s render run command %s %v failed: %w\nStderr: %s", p.Name(), commands[0], args, err, stderr.String())
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}
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return nil
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}
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