feat: extractHeader

Author: wolfogre

modules/markup/asciicast/asciicast.go

@@ -4,11 +4,13 @@
 package asciicast
 
 import (
+	"bufio"
 	"fmt"
 	"io"
 	"net/url"
 	"regexp"
 
+	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/markup"
 	"code.gitea.io/gitea/modules/setting"
 )
@@ -40,12 +42,20 @@ const (
 func (Renderer) SanitizerRules() []setting.MarkupSanitizerRule {
 	return []setting.MarkupSanitizerRule{
 		{Element: "div", AllowAttr: "class", Regexp: regexp.MustCompile(playerClassName)},
+		{Element: "div", AllowAttr: "style"},
 		{Element: "div", AllowAttr: playerSrcAttr},
 	}
 }
 
 // Render implements markup.Renderer
-func (Renderer) Render(ctx *markup.RenderContext, _ io.Reader, output io.Writer) error {
+func (Renderer) Render(ctx *markup.RenderContext, input io.Reader, output io.Writer) error {
+	var h *header
+	if firstLine, err := bufio.NewReader(input).ReadBytes('\n'); err != nil {
+		return err
+	} else if h, err = extractHeader(firstLine); err != nil {
+		log.Warn("extract header from %s: %v", ctx.RelativePath, err)
+	}
+
 	rawURL := fmt.Sprintf("%s/%s/%s/raw/%s/%s",
 		setting.AppSubURL,
 		url.PathEscape(ctx.Metas["user"]),
@@ -54,9 +64,15 @@ func (Renderer) Render(ctx *markup.RenderContext, _ io.Reader, output io.Writer)
 		url.PathEscape(ctx.RelativePath),
 	)
 
+	style := ""
+	if h != nil {
+		style = fmt.Sprintf("aspect-ratio: %d / %d", h.Width, h.Height)
+	}
+
 	_, err := io.WriteString(output, fmt.Sprintf(
-		`<div class="%s" %s="%s"></div>`,
+		`<div class="%s" style="%s" %s="%s"></div>`,
 		playerClassName,
+		style,
 		playerSrcAttr,
 		rawURL,
 	))

modules/markup/asciicast/header.go

@@ -0,0 +1,43 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package asciicast
+
+import (
+	"fmt"
+
+	"code.gitea.io/gitea/modules/json"
+)
+
+type header struct {
+	// Required header attributes:
+	Version int `json:"version"`
+	Width   int `json:"width"`
+	Height  int `json:"height"`
+
+	// Optional header attributes:
+	Timestamp     int               `json:"timestamp"`
+	Duration      float64           `json:"duration"`
+	IdleTimeLimit float64           `json:"idle_time_limit"`
+	Command       string            `json:"command"`
+	Title         string            `json:"title"`
+	Env           map[string]string `json:"env"`
+	Theme         string            `json:"theme"`
+}
+
+func extractHeader(data []byte) (*header, error) {
+	h := &header{}
+	if err := json.Unmarshal(data, h); err != nil {
+		return nil, fmt.Errorf("json unmarshal: %w", err)
+	}
+	if h.Version != 2 {
+		return nil, fmt.Errorf("unknown version: %v", h.Version)
+	}
+	if h.Width <= 0 {
+		return nil, fmt.Errorf("invalid width: %v", h.Width)
+	}
+	if h.Height <= 0 {
+		return nil, fmt.Errorf("invalid height: %v", h.Height)
+	}
+	return h, nil
+}

web_src/less/_asciicast.less

@@ -2,7 +2,6 @@
 
 .asciinema-player-container {
   width: 100%;
-  height: 600px;
 }
 
 .asciinema-terminal {